diff options
Diffstat (limited to 'Godeps/_workspace/src/code.google.com/p/freetype-go')
10 files changed, 0 insertions, 5793 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/geom.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/geom.go deleted file mode 100644 index 63c86e6ab..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/geom.go +++ /dev/null @@ -1,280 +0,0 @@ -// Copyright 2010 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package raster - -import ( - "fmt" - "math" -) - -// A Fix32 is a 24.8 fixed point number. -type Fix32 int32 - -// A Fix64 is a 48.16 fixed point number. -type Fix64 int64 - -// String returns a human-readable representation of a 24.8 fixed point number. -// For example, the number one-and-a-quarter becomes "1:064". -func (x Fix32) String() string { - if x < 0 { - x = -x - return fmt.Sprintf("-%d:%03d", int32(x/256), int32(x%256)) - } - return fmt.Sprintf("%d:%03d", int32(x/256), int32(x%256)) -} - -// String returns a human-readable representation of a 48.16 fixed point number. -// For example, the number one-and-a-quarter becomes "1:16384". -func (x Fix64) String() string { - if x < 0 { - x = -x - return fmt.Sprintf("-%d:%05d", int64(x/65536), int64(x%65536)) - } - return fmt.Sprintf("%d:%05d", int64(x/65536), int64(x%65536)) -} - -// maxAbs returns the maximum of abs(a) and abs(b). -func maxAbs(a, b Fix32) Fix32 { - if a < 0 { - a = -a - } - if b < 0 { - b = -b - } - if a < b { - return b - } - return a -} - -// A Point represents a two-dimensional point or vector, in 24.8 fixed point -// format. -type Point struct { - X, Y Fix32 -} - -// String returns a human-readable representation of a Point. -func (p Point) String() string { - return "(" + p.X.String() + ", " + p.Y.String() + ")" -} - -// Add returns the vector p + q. -func (p Point) Add(q Point) Point { - return Point{p.X + q.X, p.Y + q.Y} -} - -// Sub returns the vector p - q. -func (p Point) Sub(q Point) Point { - return Point{p.X - q.X, p.Y - q.Y} -} - -// Mul returns the vector k * p. -func (p Point) Mul(k Fix32) Point { - return Point{p.X * k / 256, p.Y * k / 256} -} - -// Neg returns the vector -p, or equivalently p rotated by 180 degrees. -func (p Point) Neg() Point { - return Point{-p.X, -p.Y} -} - -// Dot returns the dot product p·q. -func (p Point) Dot(q Point) Fix64 { - px, py := int64(p.X), int64(p.Y) - qx, qy := int64(q.X), int64(q.Y) - return Fix64(px*qx + py*qy) -} - -// Len returns the length of the vector p. -func (p Point) Len() Fix32 { - // TODO(nigeltao): use fixed point math. - x := float64(p.X) - y := float64(p.Y) - return Fix32(math.Sqrt(x*x + y*y)) -} - -// Norm returns the vector p normalized to the given length, or the zero Point -// if p is degenerate. -func (p Point) Norm(length Fix32) Point { - d := p.Len() - if d == 0 { - return Point{} - } - s, t := int64(length), int64(d) - x := int64(p.X) * s / t - y := int64(p.Y) * s / t - return Point{Fix32(x), Fix32(y)} -} - -// Rot45CW returns the vector p rotated clockwise by 45 degrees. -// Note that the Y-axis grows downwards, so {1, 0}.Rot45CW is {1/√2, 1/√2}. -func (p Point) Rot45CW() Point { - // 181/256 is approximately 1/√2, or sin(π/4). - px, py := int64(p.X), int64(p.Y) - qx := (+px - py) * 181 / 256 - qy := (+px + py) * 181 / 256 - return Point{Fix32(qx), Fix32(qy)} -} - -// Rot90CW returns the vector p rotated clockwise by 90 degrees. -// Note that the Y-axis grows downwards, so {1, 0}.Rot90CW is {0, 1}. -func (p Point) Rot90CW() Point { - return Point{-p.Y, p.X} -} - -// Rot135CW returns the vector p rotated clockwise by 135 degrees. -// Note that the Y-axis grows downwards, so {1, 0}.Rot135CW is {-1/√2, 1/√2}. -func (p Point) Rot135CW() Point { - // 181/256 is approximately 1/√2, or sin(π/4). - px, py := int64(p.X), int64(p.Y) - qx := (-px - py) * 181 / 256 - qy := (+px - py) * 181 / 256 - return Point{Fix32(qx), Fix32(qy)} -} - -// Rot45CCW returns the vector p rotated counter-clockwise by 45 degrees. -// Note that the Y-axis grows downwards, so {1, 0}.Rot45CCW is {1/√2, -1/√2}. -func (p Point) Rot45CCW() Point { - // 181/256 is approximately 1/√2, or sin(π/4). - px, py := int64(p.X), int64(p.Y) - qx := (+px + py) * 181 / 256 - qy := (-px + py) * 181 / 256 - return Point{Fix32(qx), Fix32(qy)} -} - -// Rot90CCW returns the vector p rotated counter-clockwise by 90 degrees. -// Note that the Y-axis grows downwards, so {1, 0}.Rot90CCW is {0, -1}. -func (p Point) Rot90CCW() Point { - return Point{p.Y, -p.X} -} - -// Rot135CCW returns the vector p rotated counter-clockwise by 135 degrees. -// Note that the Y-axis grows downwards, so {1, 0}.Rot135CCW is {-1/√2, -1/√2}. -func (p Point) Rot135CCW() Point { - // 181/256 is approximately 1/√2, or sin(π/4). - px, py := int64(p.X), int64(p.Y) - qx := (-px + py) * 181 / 256 - qy := (-px - py) * 181 / 256 - return Point{Fix32(qx), Fix32(qy)} -} - -// An Adder accumulates points on a curve. -type Adder interface { - // Start starts a new curve at the given point. - Start(a Point) - // Add1 adds a linear segment to the current curve. - Add1(b Point) - // Add2 adds a quadratic segment to the current curve. - Add2(b, c Point) - // Add3 adds a cubic segment to the current curve. - Add3(b, c, d Point) -} - -// A Path is a sequence of curves, and a curve is a start point followed by a -// sequence of linear, quadratic or cubic segments. -type Path []Fix32 - -// String returns a human-readable representation of a Path. -func (p Path) String() string { - s := "" - for i := 0; i < len(p); { - if i != 0 { - s += " " - } - switch p[i] { - case 0: - s += "S0" + fmt.Sprint([]Fix32(p[i+1:i+3])) - i += 4 - case 1: - s += "A1" + fmt.Sprint([]Fix32(p[i+1:i+3])) - i += 4 - case 2: - s += "A2" + fmt.Sprint([]Fix32(p[i+1:i+5])) - i += 6 - case 3: - s += "A3" + fmt.Sprint([]Fix32(p[i+1:i+7])) - i += 8 - default: - panic("freetype/raster: bad path") - } - } - return s -} - -// Clear cancels any previous calls to p.Start or p.AddXxx. -func (p *Path) Clear() { - *p = (*p)[:0] -} - -// Start starts a new curve at the given point. -func (p *Path) Start(a Point) { - *p = append(*p, 0, a.X, a.Y, 0) -} - -// Add1 adds a linear segment to the current curve. -func (p *Path) Add1(b Point) { - *p = append(*p, 1, b.X, b.Y, 1) -} - -// Add2 adds a quadratic segment to the current curve. -func (p *Path) Add2(b, c Point) { - *p = append(*p, 2, b.X, b.Y, c.X, c.Y, 2) -} - -// Add3 adds a cubic segment to the current curve. -func (p *Path) Add3(b, c, d Point) { - *p = append(*p, 3, b.X, b.Y, c.X, c.Y, d.X, d.Y, 3) -} - -// AddPath adds the Path q to p. -func (p *Path) AddPath(q Path) { - *p = append(*p, q...) -} - -// AddStroke adds a stroked Path. -func (p *Path) AddStroke(q Path, width Fix32, cr Capper, jr Joiner) { - Stroke(p, q, width, cr, jr) -} - -// firstPoint returns the first point in a non-empty Path. -func (p Path) firstPoint() Point { - return Point{p[1], p[2]} -} - -// lastPoint returns the last point in a non-empty Path. -func (p Path) lastPoint() Point { - return Point{p[len(p)-3], p[len(p)-2]} -} - -// addPathReversed adds q reversed to p. -// For example, if q consists of a linear segment from A to B followed by a -// quadratic segment from B to C to D, then the values of q looks like: -// index: 01234567890123 -// value: 0AA01BB12CCDD2 -// So, when adding q backwards to p, we want to Add2(C, B) followed by Add1(A). -func addPathReversed(p Adder, q Path) { - if len(q) == 0 { - return - } - i := len(q) - 1 - for { - switch q[i] { - case 0: - return - case 1: - i -= 4 - p.Add1(Point{q[i-2], q[i-1]}) - case 2: - i -= 6 - p.Add2(Point{q[i+2], q[i+3]}, Point{q[i-2], q[i-1]}) - case 3: - i -= 8 - p.Add3(Point{q[i+4], q[i+5]}, Point{q[i+2], q[i+3]}, Point{q[i-2], q[i-1]}) - default: - panic("freetype/raster: bad path") - } - } -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/paint.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/paint.go deleted file mode 100644 index 13cccc192..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/paint.go +++ /dev/null @@ -1,292 +0,0 @@ -// Copyright 2010 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package raster - -import ( - "image" - "image/color" - "image/draw" - "math" -) - -// A Span is a horizontal segment of pixels with constant alpha. X0 is an -// inclusive bound and X1 is exclusive, the same as for slices. A fully -// opaque Span has A == 1<<32 - 1. -type Span struct { - Y, X0, X1 int - A uint32 -} - -// A Painter knows how to paint a batch of Spans. Rasterization may involve -// Painting multiple batches, and done will be true for the final batch. -// The Spans' Y values are monotonically increasing during a rasterization. -// Paint may use all of ss as scratch space during the call. -type Painter interface { - Paint(ss []Span, done bool) -} - -// The PainterFunc type adapts an ordinary function to the Painter interface. -type PainterFunc func(ss []Span, done bool) - -// Paint just delegates the call to f. -func (f PainterFunc) Paint(ss []Span, done bool) { f(ss, done) } - -// An AlphaOverPainter is a Painter that paints Spans onto an image.Alpha -// using the Over Porter-Duff composition operator. -type AlphaOverPainter struct { - Image *image.Alpha -} - -// Paint satisfies the Painter interface by painting ss onto an image.Alpha. -func (r AlphaOverPainter) Paint(ss []Span, done bool) { - b := r.Image.Bounds() - for _, s := range ss { - if s.Y < b.Min.Y { - continue - } - if s.Y >= b.Max.Y { - return - } - if s.X0 < b.Min.X { - s.X0 = b.Min.X - } - if s.X1 > b.Max.X { - s.X1 = b.Max.X - } - if s.X0 >= s.X1 { - continue - } - base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X - p := r.Image.Pix[base+s.X0 : base+s.X1] - a := int(s.A >> 24) - for i, c := range p { - v := int(c) - p[i] = uint8((v*255 + (255-v)*a) / 255) - } - } -} - -// NewAlphaOverPainter creates a new AlphaOverPainter for the given image. -func NewAlphaOverPainter(m *image.Alpha) AlphaOverPainter { - return AlphaOverPainter{m} -} - -// An AlphaSrcPainter is a Painter that paints Spans onto an image.Alpha -// using the Src Porter-Duff composition operator. -type AlphaSrcPainter struct { - Image *image.Alpha -} - -// Paint satisfies the Painter interface by painting ss onto an image.Alpha. -func (r AlphaSrcPainter) Paint(ss []Span, done bool) { - b := r.Image.Bounds() - for _, s := range ss { - if s.Y < b.Min.Y { - continue - } - if s.Y >= b.Max.Y { - return - } - if s.X0 < b.Min.X { - s.X0 = b.Min.X - } - if s.X1 > b.Max.X { - s.X1 = b.Max.X - } - if s.X0 >= s.X1 { - continue - } - base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X - p := r.Image.Pix[base+s.X0 : base+s.X1] - color := uint8(s.A >> 24) - for i := range p { - p[i] = color - } - } -} - -// NewAlphaSrcPainter creates a new AlphaSrcPainter for the given image. -func NewAlphaSrcPainter(m *image.Alpha) AlphaSrcPainter { - return AlphaSrcPainter{m} -} - -type RGBAPainter struct { - // The image to compose onto. - Image *image.RGBA - // The Porter-Duff composition operator. - Op draw.Op - // The 16-bit color to paint the spans. - cr, cg, cb, ca uint32 -} - -// Paint satisfies the Painter interface by painting ss onto an image.RGBA. -func (r *RGBAPainter) Paint(ss []Span, done bool) { - b := r.Image.Bounds() - for _, s := range ss { - if s.Y < b.Min.Y { - continue - } - if s.Y >= b.Max.Y { - return - } - if s.X0 < b.Min.X { - s.X0 = b.Min.X - } - if s.X1 > b.Max.X { - s.X1 = b.Max.X - } - if s.X0 >= s.X1 { - continue - } - // This code is similar to drawGlyphOver in $GOROOT/src/pkg/image/draw/draw.go. - ma := s.A >> 16 - const m = 1<<16 - 1 - i0 := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride + (s.X0-r.Image.Rect.Min.X)*4 - i1 := i0 + (s.X1-s.X0)*4 - if r.Op == draw.Over { - for i := i0; i < i1; i += 4 { - dr := uint32(r.Image.Pix[i+0]) - dg := uint32(r.Image.Pix[i+1]) - db := uint32(r.Image.Pix[i+2]) - da := uint32(r.Image.Pix[i+3]) - a := (m - (r.ca * ma / m)) * 0x101 - r.Image.Pix[i+0] = uint8((dr*a + r.cr*ma) / m >> 8) - r.Image.Pix[i+1] = uint8((dg*a + r.cg*ma) / m >> 8) - r.Image.Pix[i+2] = uint8((db*a + r.cb*ma) / m >> 8) - r.Image.Pix[i+3] = uint8((da*a + r.ca*ma) / m >> 8) - } - } else { - for i := i0; i < i1; i += 4 { - r.Image.Pix[i+0] = uint8(r.cr * ma / m >> 8) - r.Image.Pix[i+1] = uint8(r.cg * ma / m >> 8) - r.Image.Pix[i+2] = uint8(r.cb * ma / m >> 8) - r.Image.Pix[i+3] = uint8(r.ca * ma / m >> 8) - } - } - } -} - -// SetColor sets the color to paint the spans. -func (r *RGBAPainter) SetColor(c color.Color) { - r.cr, r.cg, r.cb, r.ca = c.RGBA() -} - -// NewRGBAPainter creates a new RGBAPainter for the given image. -func NewRGBAPainter(m *image.RGBA) *RGBAPainter { - return &RGBAPainter{Image: m} -} - -// A MonochromePainter wraps another Painter, quantizing each Span's alpha to -// be either fully opaque or fully transparent. -type MonochromePainter struct { - Painter Painter - y, x0, x1 int -} - -// Paint delegates to the wrapped Painter after quantizing each Span's alpha -// value and merging adjacent fully opaque Spans. -func (m *MonochromePainter) Paint(ss []Span, done bool) { - // We compact the ss slice, discarding any Spans whose alpha quantizes to zero. - j := 0 - for _, s := range ss { - if s.A >= 1<<31 { - if m.y == s.Y && m.x1 == s.X0 { - m.x1 = s.X1 - } else { - ss[j] = Span{m.y, m.x0, m.x1, 1<<32 - 1} - j++ - m.y, m.x0, m.x1 = s.Y, s.X0, s.X1 - } - } - } - if done { - // Flush the accumulated Span. - finalSpan := Span{m.y, m.x0, m.x1, 1<<32 - 1} - if j < len(ss) { - ss[j] = finalSpan - j++ - m.Painter.Paint(ss[:j], true) - } else if j == len(ss) { - m.Painter.Paint(ss, false) - if cap(ss) > 0 { - ss = ss[:1] - } else { - ss = make([]Span, 1) - } - ss[0] = finalSpan - m.Painter.Paint(ss, true) - } else { - panic("unreachable") - } - // Reset the accumulator, so that this Painter can be re-used. - m.y, m.x0, m.x1 = 0, 0, 0 - } else { - m.Painter.Paint(ss[:j], false) - } -} - -// NewMonochromePainter creates a new MonochromePainter that wraps the given -// Painter. -func NewMonochromePainter(p Painter) *MonochromePainter { - return &MonochromePainter{Painter: p} -} - -// A GammaCorrectionPainter wraps another Painter, performing gamma-correction -// on each Span's alpha value. -type GammaCorrectionPainter struct { - // The wrapped Painter. - Painter Painter - // Precomputed alpha values for linear interpolation, with fully opaque == 1<<16-1. - a [256]uint16 - // Whether gamma correction is a no-op. - gammaIsOne bool -} - -// Paint delegates to the wrapped Painter after performing gamma-correction -// on each Span. -func (g *GammaCorrectionPainter) Paint(ss []Span, done bool) { - if !g.gammaIsOne { - const ( - M = 0x1010101 // 255*M == 1<<32-1 - N = 0x8080 // N = M>>9, and N < 1<<16-1 - ) - for i, s := range ss { - if s.A == 0 || s.A == 1<<32-1 { - continue - } - p, q := s.A/M, (s.A%M)>>9 - // The resultant alpha is a linear interpolation of g.a[p] and g.a[p+1]. - a := uint32(g.a[p])*(N-q) + uint32(g.a[p+1])*q - a = (a + N/2) / N - // Convert the alpha from 16-bit (which is g.a's range) to 32-bit. - a |= a << 16 - ss[i].A = a - } - } - g.Painter.Paint(ss, done) -} - -// SetGamma sets the gamma value. -func (g *GammaCorrectionPainter) SetGamma(gamma float64) { - if gamma == 1.0 { - g.gammaIsOne = true - return - } - g.gammaIsOne = false - for i := 0; i < 256; i++ { - a := float64(i) / 0xff - a = math.Pow(a, gamma) - g.a[i] = uint16(0xffff * a) - } -} - -// NewGammaCorrectionPainter creates a new GammaCorrectionPainter that wraps -// the given Painter. -func NewGammaCorrectionPainter(p Painter, gamma float64) *GammaCorrectionPainter { - g := &GammaCorrectionPainter{Painter: p} - g.SetGamma(gamma) - return g -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/raster.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/raster.go deleted file mode 100644 index 45af7eaa2..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/raster.go +++ /dev/null @@ -1,579 +0,0 @@ -// Copyright 2010 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -// The raster package provides an anti-aliasing 2-D rasterizer. -// -// It is part of the larger Freetype-Go suite of font-related packages, -// but the raster package is not specific to font rasterization, and can -// be used standalone without any other Freetype-Go package. -// -// Rasterization is done by the same area/coverage accumulation algorithm -// as the Freetype "smooth" module, and the Anti-Grain Geometry library. -// A description of the area/coverage algorithm is at -// http://projects.tuxee.net/cl-vectors/section-the-cl-aa-algorithm -package raster - -import ( - "strconv" -) - -// A cell is part of a linked list (for a given yi co-ordinate) of accumulated -// area/coverage for the pixel at (xi, yi). -type cell struct { - xi int - area, cover int - next int -} - -type Rasterizer struct { - // If false, the default behavior is to use the even-odd winding fill - // rule during Rasterize. - UseNonZeroWinding bool - // An offset (in pixels) to the painted spans. - Dx, Dy int - - // The width of the Rasterizer. The height is implicit in len(cellIndex). - width int - // splitScaleN is the scaling factor used to determine how many times - // to decompose a quadratic or cubic segment into a linear approximation. - splitScale2, splitScale3 int - - // The current pen position. - a Point - // The current cell and its area/coverage being accumulated. - xi, yi int - area, cover int - - // Saved cells. - cell []cell - // Linked list of cells, one per row. - cellIndex []int - // Buffers. - cellBuf [256]cell - cellIndexBuf [64]int - spanBuf [64]Span -} - -// findCell returns the index in r.cell for the cell corresponding to -// (r.xi, r.yi). The cell is created if necessary. -func (r *Rasterizer) findCell() int { - if r.yi < 0 || r.yi >= len(r.cellIndex) { - return -1 - } - xi := r.xi - if xi < 0 { - xi = -1 - } else if xi > r.width { - xi = r.width - } - i, prev := r.cellIndex[r.yi], -1 - for i != -1 && r.cell[i].xi <= xi { - if r.cell[i].xi == xi { - return i - } - i, prev = r.cell[i].next, i - } - c := len(r.cell) - if c == cap(r.cell) { - buf := make([]cell, c, 4*c) - copy(buf, r.cell) - r.cell = buf[0 : c+1] - } else { - r.cell = r.cell[0 : c+1] - } - r.cell[c] = cell{xi, 0, 0, i} - if prev == -1 { - r.cellIndex[r.yi] = c - } else { - r.cell[prev].next = c - } - return c -} - -// saveCell saves any accumulated r.area/r.cover for (r.xi, r.yi). -func (r *Rasterizer) saveCell() { - if r.area != 0 || r.cover != 0 { - i := r.findCell() - if i != -1 { - r.cell[i].area += r.area - r.cell[i].cover += r.cover - } - r.area = 0 - r.cover = 0 - } -} - -// setCell sets the (xi, yi) cell that r is accumulating area/coverage for. -func (r *Rasterizer) setCell(xi, yi int) { - if r.xi != xi || r.yi != yi { - r.saveCell() - r.xi, r.yi = xi, yi - } -} - -// scan accumulates area/coverage for the yi'th scanline, going from -// x0 to x1 in the horizontal direction (in 24.8 fixed point co-ordinates) -// and from y0f to y1f fractional vertical units within that scanline. -func (r *Rasterizer) scan(yi int, x0, y0f, x1, y1f Fix32) { - // Break the 24.8 fixed point X co-ordinates into integral and fractional parts. - x0i := int(x0) / 256 - x0f := x0 - Fix32(256*x0i) - x1i := int(x1) / 256 - x1f := x1 - Fix32(256*x1i) - - // A perfectly horizontal scan. - if y0f == y1f { - r.setCell(x1i, yi) - return - } - dx, dy := x1-x0, y1f-y0f - // A single cell scan. - if x0i == x1i { - r.area += int((x0f + x1f) * dy) - r.cover += int(dy) - return - } - // There are at least two cells. Apart from the first and last cells, - // all intermediate cells go through the full width of the cell, - // or 256 units in 24.8 fixed point format. - var ( - p, q, edge0, edge1 Fix32 - xiDelta int - ) - if dx > 0 { - p, q = (256-x0f)*dy, dx - edge0, edge1, xiDelta = 0, 256, 1 - } else { - p, q = x0f*dy, -dx - edge0, edge1, xiDelta = 256, 0, -1 - } - yDelta, yRem := p/q, p%q - if yRem < 0 { - yDelta -= 1 - yRem += q - } - // Do the first cell. - xi, y := x0i, y0f - r.area += int((x0f + edge1) * yDelta) - r.cover += int(yDelta) - xi, y = xi+xiDelta, y+yDelta - r.setCell(xi, yi) - if xi != x1i { - // Do all the intermediate cells. - p = 256 * (y1f - y + yDelta) - fullDelta, fullRem := p/q, p%q - if fullRem < 0 { - fullDelta -= 1 - fullRem += q - } - yRem -= q - for xi != x1i { - yDelta = fullDelta - yRem += fullRem - if yRem >= 0 { - yDelta += 1 - yRem -= q - } - r.area += int(256 * yDelta) - r.cover += int(yDelta) - xi, y = xi+xiDelta, y+yDelta - r.setCell(xi, yi) - } - } - // Do the last cell. - yDelta = y1f - y - r.area += int((edge0 + x1f) * yDelta) - r.cover += int(yDelta) -} - -// Start starts a new curve at the given point. -func (r *Rasterizer) Start(a Point) { - r.setCell(int(a.X/256), int(a.Y/256)) - r.a = a -} - -// Add1 adds a linear segment to the current curve. -func (r *Rasterizer) Add1(b Point) { - x0, y0 := r.a.X, r.a.Y - x1, y1 := b.X, b.Y - dx, dy := x1-x0, y1-y0 - // Break the 24.8 fixed point Y co-ordinates into integral and fractional parts. - y0i := int(y0) / 256 - y0f := y0 - Fix32(256*y0i) - y1i := int(y1) / 256 - y1f := y1 - Fix32(256*y1i) - - if y0i == y1i { - // There is only one scanline. - r.scan(y0i, x0, y0f, x1, y1f) - - } else if dx == 0 { - // This is a vertical line segment. We avoid calling r.scan and instead - // manipulate r.area and r.cover directly. - var ( - edge0, edge1 Fix32 - yiDelta int - ) - if dy > 0 { - edge0, edge1, yiDelta = 0, 256, 1 - } else { - edge0, edge1, yiDelta = 256, 0, -1 - } - x0i, yi := int(x0)/256, y0i - x0fTimes2 := (int(x0) - (256 * x0i)) * 2 - // Do the first pixel. - dcover := int(edge1 - y0f) - darea := int(x0fTimes2 * dcover) - r.area += darea - r.cover += dcover - yi += yiDelta - r.setCell(x0i, yi) - // Do all the intermediate pixels. - dcover = int(edge1 - edge0) - darea = int(x0fTimes2 * dcover) - for yi != y1i { - r.area += darea - r.cover += dcover - yi += yiDelta - r.setCell(x0i, yi) - } - // Do the last pixel. - dcover = int(y1f - edge0) - darea = int(x0fTimes2 * dcover) - r.area += darea - r.cover += dcover - - } else { - // There are at least two scanlines. Apart from the first and last scanlines, - // all intermediate scanlines go through the full height of the row, or 256 - // units in 24.8 fixed point format. - var ( - p, q, edge0, edge1 Fix32 - yiDelta int - ) - if dy > 0 { - p, q = (256-y0f)*dx, dy - edge0, edge1, yiDelta = 0, 256, 1 - } else { - p, q = y0f*dx, -dy - edge0, edge1, yiDelta = 256, 0, -1 - } - xDelta, xRem := p/q, p%q - if xRem < 0 { - xDelta -= 1 - xRem += q - } - // Do the first scanline. - x, yi := x0, y0i - r.scan(yi, x, y0f, x+xDelta, edge1) - x, yi = x+xDelta, yi+yiDelta - r.setCell(int(x)/256, yi) - if yi != y1i { - // Do all the intermediate scanlines. - p = 256 * dx - fullDelta, fullRem := p/q, p%q - if fullRem < 0 { - fullDelta -= 1 - fullRem += q - } - xRem -= q - for yi != y1i { - xDelta = fullDelta - xRem += fullRem - if xRem >= 0 { - xDelta += 1 - xRem -= q - } - r.scan(yi, x, edge0, x+xDelta, edge1) - x, yi = x+xDelta, yi+yiDelta - r.setCell(int(x)/256, yi) - } - } - // Do the last scanline. - r.scan(yi, x, edge0, x1, y1f) - } - // The next lineTo starts from b. - r.a = b -} - -// Add2 adds a quadratic segment to the current curve. -func (r *Rasterizer) Add2(b, c Point) { - // Calculate nSplit (the number of recursive decompositions) based on how `curvy' it is. - // Specifically, how much the middle point b deviates from (a+c)/2. - dev := maxAbs(r.a.X-2*b.X+c.X, r.a.Y-2*b.Y+c.Y) / Fix32(r.splitScale2) - nsplit := 0 - for dev > 0 { - dev /= 4 - nsplit++ - } - // dev is 32-bit, and nsplit++ every time we shift off 2 bits, so maxNsplit is 16. - const maxNsplit = 16 - if nsplit > maxNsplit { - panic("freetype/raster: Add2 nsplit too large: " + strconv.Itoa(nsplit)) - } - // Recursively decompose the curve nSplit levels deep. - var ( - pStack [2*maxNsplit + 3]Point - sStack [maxNsplit + 1]int - i int - ) - sStack[0] = nsplit - pStack[0] = c - pStack[1] = b - pStack[2] = r.a - for i >= 0 { - s := sStack[i] - p := pStack[2*i:] - if s > 0 { - // Split the quadratic curve p[:3] into an equivalent set of two shorter curves: - // p[:3] and p[2:5]. The new p[4] is the old p[2], and p[0] is unchanged. - mx := p[1].X - p[4].X = p[2].X - p[3].X = (p[4].X + mx) / 2 - p[1].X = (p[0].X + mx) / 2 - p[2].X = (p[1].X + p[3].X) / 2 - my := p[1].Y - p[4].Y = p[2].Y - p[3].Y = (p[4].Y + my) / 2 - p[1].Y = (p[0].Y + my) / 2 - p[2].Y = (p[1].Y + p[3].Y) / 2 - // The two shorter curves have one less split to do. - sStack[i] = s - 1 - sStack[i+1] = s - 1 - i++ - } else { - // Replace the level-0 quadratic with a two-linear-piece approximation. - midx := (p[0].X + 2*p[1].X + p[2].X) / 4 - midy := (p[0].Y + 2*p[1].Y + p[2].Y) / 4 - r.Add1(Point{midx, midy}) - r.Add1(p[0]) - i-- - } - } -} - -// Add3 adds a cubic segment to the current curve. -func (r *Rasterizer) Add3(b, c, d Point) { - // Calculate nSplit (the number of recursive decompositions) based on how `curvy' it is. - dev2 := maxAbs(r.a.X-3*(b.X+c.X)+d.X, r.a.Y-3*(b.Y+c.Y)+d.Y) / Fix32(r.splitScale2) - dev3 := maxAbs(r.a.X-2*b.X+d.X, r.a.Y-2*b.Y+d.Y) / Fix32(r.splitScale3) - nsplit := 0 - for dev2 > 0 || dev3 > 0 { - dev2 /= 8 - dev3 /= 4 - nsplit++ - } - // devN is 32-bit, and nsplit++ every time we shift off 2 bits, so maxNsplit is 16. - const maxNsplit = 16 - if nsplit > maxNsplit { - panic("freetype/raster: Add3 nsplit too large: " + strconv.Itoa(nsplit)) - } - // Recursively decompose the curve nSplit levels deep. - var ( - pStack [3*maxNsplit + 4]Point - sStack [maxNsplit + 1]int - i int - ) - sStack[0] = nsplit - pStack[0] = d - pStack[1] = c - pStack[2] = b - pStack[3] = r.a - for i >= 0 { - s := sStack[i] - p := pStack[3*i:] - if s > 0 { - // Split the cubic curve p[:4] into an equivalent set of two shorter curves: - // p[:4] and p[3:7]. The new p[6] is the old p[3], and p[0] is unchanged. - m01x := (p[0].X + p[1].X) / 2 - m12x := (p[1].X + p[2].X) / 2 - m23x := (p[2].X + p[3].X) / 2 - p[6].X = p[3].X - p[5].X = m23x - p[1].X = m01x - p[2].X = (m01x + m12x) / 2 - p[4].X = (m12x + m23x) / 2 - p[3].X = (p[2].X + p[4].X) / 2 - m01y := (p[0].Y + p[1].Y) / 2 - m12y := (p[1].Y + p[2].Y) / 2 - m23y := (p[2].Y + p[3].Y) / 2 - p[6].Y = p[3].Y - p[5].Y = m23y - p[1].Y = m01y - p[2].Y = (m01y + m12y) / 2 - p[4].Y = (m12y + m23y) / 2 - p[3].Y = (p[2].Y + p[4].Y) / 2 - // The two shorter curves have one less split to do. - sStack[i] = s - 1 - sStack[i+1] = s - 1 - i++ - } else { - // Replace the level-0 cubic with a two-linear-piece approximation. - midx := (p[0].X + 3*(p[1].X+p[2].X) + p[3].X) / 8 - midy := (p[0].Y + 3*(p[1].Y+p[2].Y) + p[3].Y) / 8 - r.Add1(Point{midx, midy}) - r.Add1(p[0]) - i-- - } - } -} - -// AddPath adds the given Path. -func (r *Rasterizer) AddPath(p Path) { - for i := 0; i < len(p); { - switch p[i] { - case 0: - r.Start(Point{p[i+1], p[i+2]}) - i += 4 - case 1: - r.Add1(Point{p[i+1], p[i+2]}) - i += 4 - case 2: - r.Add2(Point{p[i+1], p[i+2]}, Point{p[i+3], p[i+4]}) - i += 6 - case 3: - r.Add3(Point{p[i+1], p[i+2]}, Point{p[i+3], p[i+4]}, Point{p[i+5], p[i+6]}) - i += 8 - default: - panic("freetype/raster: bad path") - } - } -} - -// AddStroke adds a stroked Path. -func (r *Rasterizer) AddStroke(q Path, width Fix32, cr Capper, jr Joiner) { - Stroke(r, q, width, cr, jr) -} - -// Converts an area value to a uint32 alpha value. A completely filled pixel -// corresponds to an area of 256*256*2, and an alpha of 1<<32-1. The -// conversion of area values greater than this depends on the winding rule: -// even-odd or non-zero. -func (r *Rasterizer) areaToAlpha(area int) uint32 { - // The C Freetype implementation (version 2.3.12) does "alpha := area>>1" without - // the +1. Round-to-nearest gives a more symmetric result than round-down. - // The C implementation also returns 8-bit alpha, not 32-bit alpha. - a := (area + 1) >> 1 - if a < 0 { - a = -a - } - alpha := uint32(a) - if r.UseNonZeroWinding { - if alpha > 0xffff { - alpha = 0xffff - } - } else { - alpha &= 0x1ffff - if alpha > 0x10000 { - alpha = 0x20000 - alpha - } else if alpha == 0x10000 { - alpha = 0x0ffff - } - } - alpha |= alpha << 16 - return alpha -} - -// Rasterize converts r's accumulated curves into Spans for p. The Spans -// passed to p are non-overlapping, and sorted by Y and then X. They all -// have non-zero width (and 0 <= X0 < X1 <= r.width) and non-zero A, except -// for the final Span, which has Y, X0, X1 and A all equal to zero. -func (r *Rasterizer) Rasterize(p Painter) { - r.saveCell() - s := 0 - for yi := 0; yi < len(r.cellIndex); yi++ { - xi, cover := 0, 0 - for c := r.cellIndex[yi]; c != -1; c = r.cell[c].next { - if cover != 0 && r.cell[c].xi > xi { - alpha := r.areaToAlpha(cover * 256 * 2) - if alpha != 0 { - xi0, xi1 := xi, r.cell[c].xi - if xi0 < 0 { - xi0 = 0 - } - if xi1 >= r.width { - xi1 = r.width - } - if xi0 < xi1 { - r.spanBuf[s] = Span{yi + r.Dy, xi0 + r.Dx, xi1 + r.Dx, alpha} - s++ - } - } - } - cover += r.cell[c].cover - alpha := r.areaToAlpha(cover*256*2 - r.cell[c].area) - xi = r.cell[c].xi + 1 - if alpha != 0 { - xi0, xi1 := r.cell[c].xi, xi - if xi0 < 0 { - xi0 = 0 - } - if xi1 >= r.width { - xi1 = r.width - } - if xi0 < xi1 { - r.spanBuf[s] = Span{yi + r.Dy, xi0 + r.Dx, xi1 + r.Dx, alpha} - s++ - } - } - if s > len(r.spanBuf)-2 { - p.Paint(r.spanBuf[:s], false) - s = 0 - } - } - } - p.Paint(r.spanBuf[:s], true) -} - -// Clear cancels any previous calls to r.Start or r.AddXxx. -func (r *Rasterizer) Clear() { - r.a = Point{} - r.xi = 0 - r.yi = 0 - r.area = 0 - r.cover = 0 - r.cell = r.cell[:0] - for i := 0; i < len(r.cellIndex); i++ { - r.cellIndex[i] = -1 - } -} - -// SetBounds sets the maximum width and height of the rasterized image and -// calls Clear. The width and height are in pixels, not Fix32 units. -func (r *Rasterizer) SetBounds(width, height int) { - if width < 0 { - width = 0 - } - if height < 0 { - height = 0 - } - // Use the same ssN heuristic as the C Freetype implementation. - // The C implementation uses the values 32, 16, but those are in - // 26.6 fixed point units, and we use 24.8 fixed point everywhere. - ss2, ss3 := 128, 64 - if width > 24 || height > 24 { - ss2, ss3 = 2*ss2, 2*ss3 - if width > 120 || height > 120 { - ss2, ss3 = 2*ss2, 2*ss3 - } - } - r.width = width - r.splitScale2 = ss2 - r.splitScale3 = ss3 - r.cell = r.cellBuf[:0] - if height > len(r.cellIndexBuf) { - r.cellIndex = make([]int, height) - } else { - r.cellIndex = r.cellIndexBuf[:height] - } - r.Clear() -} - -// NewRasterizer creates a new Rasterizer with the given bounds. -func NewRasterizer(width, height int) *Rasterizer { - r := new(Rasterizer) - r.SetBounds(width, height) - return r -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/stroke.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/stroke.go deleted file mode 100644 index d49b1cee9..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/raster/stroke.go +++ /dev/null @@ -1,466 +0,0 @@ -// Copyright 2010 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package raster - -// Two points are considered practically equal if the square of the distance -// between them is less than one quarter (i.e. 16384 / 65536 in Fix64). -const epsilon = 16384 - -// A Capper signifies how to begin or end a stroked path. -type Capper interface { - // Cap adds a cap to p given a pivot point and the normal vector of a - // terminal segment. The normal's length is half of the stroke width. - Cap(p Adder, halfWidth Fix32, pivot, n1 Point) -} - -// The CapperFunc type adapts an ordinary function to be a Capper. -type CapperFunc func(Adder, Fix32, Point, Point) - -func (f CapperFunc) Cap(p Adder, halfWidth Fix32, pivot, n1 Point) { - f(p, halfWidth, pivot, n1) -} - -// A Joiner signifies how to join interior nodes of a stroked path. -type Joiner interface { - // Join adds a join to the two sides of a stroked path given a pivot - // point and the normal vectors of the trailing and leading segments. - // Both normals have length equal to half of the stroke width. - Join(lhs, rhs Adder, halfWidth Fix32, pivot, n0, n1 Point) -} - -// The JoinerFunc type adapts an ordinary function to be a Joiner. -type JoinerFunc func(lhs, rhs Adder, halfWidth Fix32, pivot, n0, n1 Point) - -func (f JoinerFunc) Join(lhs, rhs Adder, halfWidth Fix32, pivot, n0, n1 Point) { - f(lhs, rhs, halfWidth, pivot, n0, n1) -} - -// RoundCapper adds round caps to a stroked path. -var RoundCapper Capper = CapperFunc(roundCapper) - -func roundCapper(p Adder, halfWidth Fix32, pivot, n1 Point) { - // The cubic Bézier approximation to a circle involves the magic number - // (√2 - 1) * 4/3, which is approximately 141/256. - const k = 141 - e := n1.Rot90CCW() - side := pivot.Add(e) - start, end := pivot.Sub(n1), pivot.Add(n1) - d, e := n1.Mul(k), e.Mul(k) - p.Add3(start.Add(e), side.Sub(d), side) - p.Add3(side.Add(d), end.Add(e), end) -} - -// ButtCapper adds butt caps to a stroked path. -var ButtCapper Capper = CapperFunc(buttCapper) - -func buttCapper(p Adder, halfWidth Fix32, pivot, n1 Point) { - p.Add1(pivot.Add(n1)) -} - -// SquareCapper adds square caps to a stroked path. -var SquareCapper Capper = CapperFunc(squareCapper) - -func squareCapper(p Adder, halfWidth Fix32, pivot, n1 Point) { - e := n1.Rot90CCW() - side := pivot.Add(e) - p.Add1(side.Sub(n1)) - p.Add1(side.Add(n1)) - p.Add1(pivot.Add(n1)) -} - -// RoundJoiner adds round joins to a stroked path. -var RoundJoiner Joiner = JoinerFunc(roundJoiner) - -func roundJoiner(lhs, rhs Adder, haflWidth Fix32, pivot, n0, n1 Point) { - dot := n0.Rot90CW().Dot(n1) - if dot >= 0 { - addArc(lhs, pivot, n0, n1) - rhs.Add1(pivot.Sub(n1)) - } else { - lhs.Add1(pivot.Add(n1)) - addArc(rhs, pivot, n0.Neg(), n1.Neg()) - } -} - -// BevelJoiner adds bevel joins to a stroked path. -var BevelJoiner Joiner = JoinerFunc(bevelJoiner) - -func bevelJoiner(lhs, rhs Adder, haflWidth Fix32, pivot, n0, n1 Point) { - lhs.Add1(pivot.Add(n1)) - rhs.Add1(pivot.Sub(n1)) -} - -// addArc adds a circular arc from pivot+n0 to pivot+n1 to p. The shorter of -// the two possible arcs is taken, i.e. the one spanning <= 180 degrees. -// The two vectors n0 and n1 must be of equal length. -func addArc(p Adder, pivot, n0, n1 Point) { - // r2 is the square of the length of n0. - r2 := n0.Dot(n0) - if r2 < epsilon { - // The arc radius is so small that we collapse to a straight line. - p.Add1(pivot.Add(n1)) - return - } - // We approximate the arc by 0, 1, 2 or 3 45-degree quadratic segments plus - // a final quadratic segment from s to n1. Each 45-degree segment has control - // points {1, 0}, {1, tan(π/8)} and {1/√2, 1/√2} suitably scaled, rotated and - // translated. tan(π/8) is approximately 106/256. - const tpo8 = 106 - var s Point - // We determine which octant the angle between n0 and n1 is in via three dot products. - // m0, m1 and m2 are n0 rotated clockwise by 45, 90 and 135 degrees. - m0 := n0.Rot45CW() - m1 := n0.Rot90CW() - m2 := m0.Rot90CW() - if m1.Dot(n1) >= 0 { - if n0.Dot(n1) >= 0 { - if m2.Dot(n1) <= 0 { - // n1 is between 0 and 45 degrees clockwise of n0. - s = n0 - } else { - // n1 is between 45 and 90 degrees clockwise of n0. - p.Add2(pivot.Add(n0).Add(m1.Mul(tpo8)), pivot.Add(m0)) - s = m0 - } - } else { - pm1, n0t := pivot.Add(m1), n0.Mul(tpo8) - p.Add2(pivot.Add(n0).Add(m1.Mul(tpo8)), pivot.Add(m0)) - p.Add2(pm1.Add(n0t), pm1) - if m0.Dot(n1) >= 0 { - // n1 is between 90 and 135 degrees clockwise of n0. - s = m1 - } else { - // n1 is between 135 and 180 degrees clockwise of n0. - p.Add2(pm1.Sub(n0t), pivot.Add(m2)) - s = m2 - } - } - } else { - if n0.Dot(n1) >= 0 { - if m0.Dot(n1) >= 0 { - // n1 is between 0 and 45 degrees counter-clockwise of n0. - s = n0 - } else { - // n1 is between 45 and 90 degrees counter-clockwise of n0. - p.Add2(pivot.Add(n0).Sub(m1.Mul(tpo8)), pivot.Sub(m2)) - s = m2.Neg() - } - } else { - pm1, n0t := pivot.Sub(m1), n0.Mul(tpo8) - p.Add2(pivot.Add(n0).Sub(m1.Mul(tpo8)), pivot.Sub(m2)) - p.Add2(pm1.Add(n0t), pm1) - if m2.Dot(n1) <= 0 { - // n1 is between 90 and 135 degrees counter-clockwise of n0. - s = m1.Neg() - } else { - // n1 is between 135 and 180 degrees counter-clockwise of n0. - p.Add2(pm1.Sub(n0t), pivot.Sub(m0)) - s = m0.Neg() - } - } - } - // The final quadratic segment has two endpoints s and n1 and the middle - // control point is a multiple of s.Add(n1), i.e. it is on the angle bisector - // of those two points. The multiple ranges between 128/256 and 150/256 as - // the angle between s and n1 ranges between 0 and 45 degrees. - // When the angle is 0 degrees (i.e. s and n1 are coincident) then s.Add(n1) - // is twice s and so the middle control point of the degenerate quadratic - // segment should be half s.Add(n1), and half = 128/256. - // When the angle is 45 degrees then 150/256 is the ratio of the lengths of - // the two vectors {1, tan(π/8)} and {1 + 1/√2, 1/√2}. - // d is the normalized dot product between s and n1. Since the angle ranges - // between 0 and 45 degrees then d ranges between 256/256 and 181/256. - d := 256 * s.Dot(n1) / r2 - multiple := Fix32(150 - 22*(d-181)/(256-181)) - p.Add2(pivot.Add(s.Add(n1).Mul(multiple)), pivot.Add(n1)) -} - -// midpoint returns the midpoint of two Points. -func midpoint(a, b Point) Point { - return Point{(a.X + b.X) / 2, (a.Y + b.Y) / 2} -} - -// angleGreaterThan45 returns whether the angle between two vectors is more -// than 45 degrees. -func angleGreaterThan45(v0, v1 Point) bool { - v := v0.Rot45CCW() - return v.Dot(v1) < 0 || v.Rot90CW().Dot(v1) < 0 -} - -// interpolate returns the point (1-t)*a + t*b. -func interpolate(a, b Point, t Fix64) Point { - s := 65536 - t - x := s*Fix64(a.X) + t*Fix64(b.X) - y := s*Fix64(a.Y) + t*Fix64(b.Y) - return Point{Fix32(x >> 16), Fix32(y >> 16)} -} - -// curviest2 returns the value of t for which the quadratic parametric curve -// (1-t)²*a + 2*t*(1-t).b + t²*c has maximum curvature. -// -// The curvature of the parametric curve f(t) = (x(t), y(t)) is -// |x′y″-y′x″| / (x′²+y′²)^(3/2). -// -// Let d = b-a and e = c-2*b+a, so that f′(t) = 2*d+2*e*t and f″(t) = 2*e. -// The curvature's numerator is (2*dx+2*ex*t)*(2*ey)-(2*dy+2*ey*t)*(2*ex), -// which simplifies to 4*dx*ey-4*dy*ex, which is constant with respect to t. -// -// Thus, curvature is extreme where the denominator is extreme, i.e. where -// (x′²+y′²) is extreme. The first order condition is that -// 2*x′*x″+2*y′*y″ = 0, or (dx+ex*t)*ex + (dy+ey*t)*ey = 0. -// Solving for t gives t = -(dx*ex+dy*ey) / (ex*ex+ey*ey). -func curviest2(a, b, c Point) Fix64 { - dx := int64(b.X - a.X) - dy := int64(b.Y - a.Y) - ex := int64(c.X - 2*b.X + a.X) - ey := int64(c.Y - 2*b.Y + a.Y) - if ex == 0 && ey == 0 { - return 32768 - } - return Fix64(-65536 * (dx*ex + dy*ey) / (ex*ex + ey*ey)) -} - -// A stroker holds state for stroking a path. -type stroker struct { - // p is the destination that records the stroked path. - p Adder - // u is the half-width of the stroke. - u Fix32 - // cr and jr specify how to end and connect path segments. - cr Capper - jr Joiner - // r is the reverse path. Stroking a path involves constructing two - // parallel paths 2*u apart. The first path is added immediately to p, - // the second path is accumulated in r and eventually added in reverse. - r Path - // a is the most recent segment point. anorm is the segment normal of - // length u at that point. - a, anorm Point -} - -// addNonCurvy2 adds a quadratic segment to the stroker, where the segment -// defined by (k.a, b, c) achieves maximum curvature at either k.a or c. -func (k *stroker) addNonCurvy2(b, c Point) { - // We repeatedly divide the segment at its middle until it is straight - // enough to approximate the stroke by just translating the control points. - // ds and ps are stacks of depths and points. t is the top of the stack. - const maxDepth = 5 - var ( - ds [maxDepth + 1]int - ps [2*maxDepth + 3]Point - t int - ) - // Initially the ps stack has one quadratic segment of depth zero. - ds[0] = 0 - ps[2] = k.a - ps[1] = b - ps[0] = c - anorm := k.anorm - var cnorm Point - - for { - depth := ds[t] - a := ps[2*t+2] - b := ps[2*t+1] - c := ps[2*t+0] - ab := b.Sub(a) - bc := c.Sub(b) - abIsSmall := ab.Dot(ab) < Fix64(1<<16) - bcIsSmall := bc.Dot(bc) < Fix64(1<<16) - if abIsSmall && bcIsSmall { - // Approximate the segment by a circular arc. - cnorm = bc.Norm(k.u).Rot90CCW() - mac := midpoint(a, c) - addArc(k.p, mac, anorm, cnorm) - addArc(&k.r, mac, anorm.Neg(), cnorm.Neg()) - } else if depth < maxDepth && angleGreaterThan45(ab, bc) { - // Divide the segment in two and push both halves on the stack. - mab := midpoint(a, b) - mbc := midpoint(b, c) - t++ - ds[t+0] = depth + 1 - ds[t-1] = depth + 1 - ps[2*t+2] = a - ps[2*t+1] = mab - ps[2*t+0] = midpoint(mab, mbc) - ps[2*t-1] = mbc - continue - } else { - // Translate the control points. - bnorm := c.Sub(a).Norm(k.u).Rot90CCW() - cnorm = bc.Norm(k.u).Rot90CCW() - k.p.Add2(b.Add(bnorm), c.Add(cnorm)) - k.r.Add2(b.Sub(bnorm), c.Sub(cnorm)) - } - if t == 0 { - k.a, k.anorm = c, cnorm - return - } - t-- - anorm = cnorm - } - panic("unreachable") -} - -// Add1 adds a linear segment to the stroker. -func (k *stroker) Add1(b Point) { - bnorm := b.Sub(k.a).Norm(k.u).Rot90CCW() - if len(k.r) == 0 { - k.p.Start(k.a.Add(bnorm)) - k.r.Start(k.a.Sub(bnorm)) - } else { - k.jr.Join(k.p, &k.r, k.u, k.a, k.anorm, bnorm) - } - k.p.Add1(b.Add(bnorm)) - k.r.Add1(b.Sub(bnorm)) - k.a, k.anorm = b, bnorm -} - -// Add2 adds a quadratic segment to the stroker. -func (k *stroker) Add2(b, c Point) { - ab := b.Sub(k.a) - bc := c.Sub(b) - abnorm := ab.Norm(k.u).Rot90CCW() - if len(k.r) == 0 { - k.p.Start(k.a.Add(abnorm)) - k.r.Start(k.a.Sub(abnorm)) - } else { - k.jr.Join(k.p, &k.r, k.u, k.a, k.anorm, abnorm) - } - - // Approximate nearly-degenerate quadratics by linear segments. - abIsSmall := ab.Dot(ab) < epsilon - bcIsSmall := bc.Dot(bc) < epsilon - if abIsSmall || bcIsSmall { - acnorm := c.Sub(k.a).Norm(k.u).Rot90CCW() - k.p.Add1(c.Add(acnorm)) - k.r.Add1(c.Sub(acnorm)) - k.a, k.anorm = c, acnorm - return - } - - // The quadratic segment (k.a, b, c) has a point of maximum curvature. - // If this occurs at an end point, we process the segment as a whole. - t := curviest2(k.a, b, c) - if t <= 0 || t >= 65536 { - k.addNonCurvy2(b, c) - return - } - - // Otherwise, we perform a de Casteljau decomposition at the point of - // maximum curvature and process the two straighter parts. - mab := interpolate(k.a, b, t) - mbc := interpolate(b, c, t) - mabc := interpolate(mab, mbc, t) - - // If the vectors ab and bc are close to being in opposite directions, - // then the decomposition can become unstable, so we approximate the - // quadratic segment by two linear segments joined by an arc. - bcnorm := bc.Norm(k.u).Rot90CCW() - if abnorm.Dot(bcnorm) < -Fix64(k.u)*Fix64(k.u)*2047/2048 { - pArc := abnorm.Dot(bc) < 0 - - k.p.Add1(mabc.Add(abnorm)) - if pArc { - z := abnorm.Rot90CW() - addArc(k.p, mabc, abnorm, z) - addArc(k.p, mabc, z, bcnorm) - } - k.p.Add1(mabc.Add(bcnorm)) - k.p.Add1(c.Add(bcnorm)) - - k.r.Add1(mabc.Sub(abnorm)) - if !pArc { - z := abnorm.Rot90CW() - addArc(&k.r, mabc, abnorm.Neg(), z) - addArc(&k.r, mabc, z, bcnorm.Neg()) - } - k.r.Add1(mabc.Sub(bcnorm)) - k.r.Add1(c.Sub(bcnorm)) - - k.a, k.anorm = c, bcnorm - return - } - - // Process the decomposed parts. - k.addNonCurvy2(mab, mabc) - k.addNonCurvy2(mbc, c) -} - -// Add3 adds a cubic segment to the stroker. -func (k *stroker) Add3(b, c, d Point) { - panic("freetype/raster: stroke unimplemented for cubic segments") -} - -// stroke adds the stroked Path q to p, where q consists of exactly one curve. -func (k *stroker) stroke(q Path) { - // Stroking is implemented by deriving two paths each k.u apart from q. - // The left-hand-side path is added immediately to k.p; the right-hand-side - // path is accumulated in k.r. Once we've finished adding the LHS to k.p, - // we add the RHS in reverse order. - k.r = make(Path, 0, len(q)) - k.a = Point{q[1], q[2]} - for i := 4; i < len(q); { - switch q[i] { - case 1: - k.Add1(Point{q[i+1], q[i+2]}) - i += 4 - case 2: - k.Add2(Point{q[i+1], q[i+2]}, Point{q[i+3], q[i+4]}) - i += 6 - case 3: - k.Add3(Point{q[i+1], q[i+2]}, Point{q[i+3], q[i+4]}, Point{q[i+5], q[i+6]}) - i += 8 - default: - panic("freetype/raster: bad path") - } - } - if len(k.r) == 0 { - return - } - // TODO(nigeltao): if q is a closed curve then we should join the first and - // last segments instead of capping them. - k.cr.Cap(k.p, k.u, q.lastPoint(), k.anorm.Neg()) - addPathReversed(k.p, k.r) - pivot := q.firstPoint() - k.cr.Cap(k.p, k.u, pivot, pivot.Sub(Point{k.r[1], k.r[2]})) -} - -// Stroke adds q stroked with the given width to p. The result is typically -// self-intersecting and should be rasterized with UseNonZeroWinding. -// cr and jr may be nil, which defaults to a RoundCapper or RoundJoiner. -func Stroke(p Adder, q Path, width Fix32, cr Capper, jr Joiner) { - if len(q) == 0 { - return - } - if cr == nil { - cr = RoundCapper - } - if jr == nil { - jr = RoundJoiner - } - if q[0] != 0 { - panic("freetype/raster: bad path") - } - s := stroker{p: p, u: width / 2, cr: cr, jr: jr} - i := 0 - for j := 4; j < len(q); { - switch q[j] { - case 0: - s.stroke(q[i:j]) - i, j = j, j+4 - case 1: - j += 4 - case 2: - j += 6 - case 3: - j += 8 - default: - panic("freetype/raster: bad path") - } - } - s.stroke(q[i:]) -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/glyph.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/glyph.go deleted file mode 100644 index b5f327851..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/glyph.go +++ /dev/null @@ -1,530 +0,0 @@ -// Copyright 2010 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package truetype - -// Hinting is the policy for snapping a glyph's contours to pixel boundaries. -type Hinting int32 - -const ( - // NoHinting means to not perform any hinting. - NoHinting Hinting = iota - // FullHinting means to use the font's hinting instructions. - FullHinting - - // TODO: implement VerticalHinting. -) - -// A Point is a co-ordinate pair plus whether it is ``on'' a contour or an -// ``off'' control point. -type Point struct { - X, Y int32 - // The Flags' LSB means whether or not this Point is ``on'' the contour. - // Other bits are reserved for internal use. - Flags uint32 -} - -// A GlyphBuf holds a glyph's contours. A GlyphBuf can be re-used to load a -// series of glyphs from a Font. -type GlyphBuf struct { - // AdvanceWidth is the glyph's advance width. - AdvanceWidth int32 - // B is the glyph's bounding box. - B Bounds - // Point contains all Points from all contours of the glyph. If - // hinting was used to load a glyph then Unhinted contains those - // Points before they were hinted, and InFontUnits contains those - // Points before they were hinted and scaled. - Point, Unhinted, InFontUnits []Point - // End is the point indexes of the end point of each countour. The - // length of End is the number of contours in the glyph. The i'th - // contour consists of points Point[End[i-1]:End[i]], where End[-1] - // is interpreted to mean zero. - End []int - - font *Font - scale int32 - hinting Hinting - hinter hinter - // phantomPoints are the co-ordinates of the synthetic phantom points - // used for hinting and bounding box calculations. - phantomPoints [4]Point - // pp1x is the X co-ordinate of the first phantom point. The '1' is - // using 1-based indexing; pp1x is almost always phantomPoints[0].X. - // TODO: eliminate this and consistently use phantomPoints[0].X. - pp1x int32 - // metricsSet is whether the glyph's metrics have been set yet. For a - // compound glyph, a sub-glyph may override the outer glyph's metrics. - metricsSet bool - // tmp is a scratch buffer. - tmp []Point -} - -// Flags for decoding a glyph's contours. These flags are documented at -// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html. -const ( - flagOnCurve = 1 << iota - flagXShortVector - flagYShortVector - flagRepeat - flagPositiveXShortVector - flagPositiveYShortVector - - // The remaining flags are for internal use. - flagTouchedX - flagTouchedY -) - -// The same flag bits (0x10 and 0x20) are overloaded to have two meanings, -// dependent on the value of the flag{X,Y}ShortVector bits. -const ( - flagThisXIsSame = flagPositiveXShortVector - flagThisYIsSame = flagPositiveYShortVector -) - -// Load loads a glyph's contours from a Font, overwriting any previously -// loaded contours for this GlyphBuf. scale is the number of 26.6 fixed point -// units in 1 em, i is the glyph index, and h is the hinting policy. -func (g *GlyphBuf) Load(f *Font, scale int32, i Index, h Hinting) error { - g.Point = g.Point[:0] - g.Unhinted = g.Unhinted[:0] - g.InFontUnits = g.InFontUnits[:0] - g.End = g.End[:0] - g.font = f - g.hinting = h - g.scale = scale - g.pp1x = 0 - g.phantomPoints = [4]Point{} - g.metricsSet = false - - if h != NoHinting { - if err := g.hinter.init(f, scale); err != nil { - return err - } - } - if err := g.load(0, i, true); err != nil { - return err - } - // TODO: this selection of either g.pp1x or g.phantomPoints[0].X isn't ideal, - // and should be cleaned up once we have all the testScaling tests passing, - // plus additional tests for Freetype-Go's bounding boxes matching C Freetype's. - pp1x := g.pp1x - if h != NoHinting { - pp1x = g.phantomPoints[0].X - } - if pp1x != 0 { - for i := range g.Point { - g.Point[i].X -= pp1x - } - } - - advanceWidth := g.phantomPoints[1].X - g.phantomPoints[0].X - if h != NoHinting { - if len(f.hdmx) >= 8 { - if n := u32(f.hdmx, 4); n > 3+uint32(i) { - for hdmx := f.hdmx[8:]; uint32(len(hdmx)) >= n; hdmx = hdmx[n:] { - if int32(hdmx[0]) == scale>>6 { - advanceWidth = int32(hdmx[2+i]) << 6 - break - } - } - } - } - advanceWidth = (advanceWidth + 32) &^ 63 - } - g.AdvanceWidth = advanceWidth - - // Set g.B to the 'control box', which is the bounding box of the Bézier - // curves' control points. This is easier to calculate, no smaller than - // and often equal to the tightest possible bounding box of the curves - // themselves. This approach is what C Freetype does. We can't just scale - // the nominal bounding box in the glyf data as the hinting process and - // phantom point adjustment may move points outside of that box. - if len(g.Point) == 0 { - g.B = Bounds{} - } else { - p := g.Point[0] - g.B.XMin = p.X - g.B.XMax = p.X - g.B.YMin = p.Y - g.B.YMax = p.Y - for _, p := range g.Point[1:] { - if g.B.XMin > p.X { - g.B.XMin = p.X - } else if g.B.XMax < p.X { - g.B.XMax = p.X - } - if g.B.YMin > p.Y { - g.B.YMin = p.Y - } else if g.B.YMax < p.Y { - g.B.YMax = p.Y - } - } - // Snap the box to the grid, if hinting is on. - if h != NoHinting { - g.B.XMin &^= 63 - g.B.YMin &^= 63 - g.B.XMax += 63 - g.B.XMax &^= 63 - g.B.YMax += 63 - g.B.YMax &^= 63 - } - } - return nil -} - -func (g *GlyphBuf) load(recursion int32, i Index, useMyMetrics bool) (err error) { - // The recursion limit here is arbitrary, but defends against malformed glyphs. - if recursion >= 32 { - return UnsupportedError("excessive compound glyph recursion") - } - // Find the relevant slice of g.font.glyf. - var g0, g1 uint32 - if g.font.locaOffsetFormat == locaOffsetFormatShort { - g0 = 2 * uint32(u16(g.font.loca, 2*int(i))) - g1 = 2 * uint32(u16(g.font.loca, 2*int(i)+2)) - } else { - g0 = u32(g.font.loca, 4*int(i)) - g1 = u32(g.font.loca, 4*int(i)+4) - } - - // Decode the contour count and nominal bounding box, from the first - // 10 bytes of the glyf data. boundsYMin and boundsXMax, at offsets 4 - // and 6, are unused. - glyf, ne, boundsXMin, boundsYMax := []byte(nil), 0, int32(0), int32(0) - if g0+10 <= g1 { - glyf = g.font.glyf[g0:g1] - ne = int(int16(u16(glyf, 0))) - boundsXMin = int32(int16(u16(glyf, 2))) - boundsYMax = int32(int16(u16(glyf, 8))) - } - - // Create the phantom points. - uhm, pp1x := g.font.unscaledHMetric(i), int32(0) - uvm := g.font.unscaledVMetric(i, boundsYMax) - g.phantomPoints = [4]Point{ - {X: boundsXMin - uhm.LeftSideBearing}, - {X: boundsXMin - uhm.LeftSideBearing + uhm.AdvanceWidth}, - {X: uhm.AdvanceWidth / 2, Y: boundsYMax + uvm.TopSideBearing}, - {X: uhm.AdvanceWidth / 2, Y: boundsYMax + uvm.TopSideBearing - uvm.AdvanceHeight}, - } - if len(glyf) == 0 { - g.addPhantomsAndScale(len(g.Point), len(g.Point), true, true) - copy(g.phantomPoints[:], g.Point[len(g.Point)-4:]) - g.Point = g.Point[:len(g.Point)-4] - return nil - } - - // Load and hint the contours. - if ne < 0 { - if ne != -1 { - // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html says that - // "the values -2, -3, and so forth, are reserved for future use." - return UnsupportedError("negative number of contours") - } - pp1x = g.font.scale(g.scale * (boundsXMin - uhm.LeftSideBearing)) - if err := g.loadCompound(recursion, uhm, i, glyf, useMyMetrics); err != nil { - return err - } - } else { - np0, ne0 := len(g.Point), len(g.End) - program := g.loadSimple(glyf, ne) - g.addPhantomsAndScale(np0, np0, true, true) - pp1x = g.Point[len(g.Point)-4].X - if g.hinting != NoHinting { - if len(program) != 0 { - err := g.hinter.run( - program, - g.Point[np0:], - g.Unhinted[np0:], - g.InFontUnits[np0:], - g.End[ne0:], - ) - if err != nil { - return err - } - } - // Drop the four phantom points. - g.InFontUnits = g.InFontUnits[:len(g.InFontUnits)-4] - g.Unhinted = g.Unhinted[:len(g.Unhinted)-4] - } - if useMyMetrics { - copy(g.phantomPoints[:], g.Point[len(g.Point)-4:]) - } - g.Point = g.Point[:len(g.Point)-4] - if np0 != 0 { - // The hinting program expects the []End values to be indexed relative - // to the inner glyph, not the outer glyph, so we delay adding np0 until - // after the hinting program (if any) has run. - for i := ne0; i < len(g.End); i++ { - g.End[i] += np0 - } - } - } - if useMyMetrics && !g.metricsSet { - g.metricsSet = true - g.pp1x = pp1x - } - return nil -} - -// loadOffset is the initial offset for loadSimple and loadCompound. The first -// 10 bytes are the number of contours and the bounding box. -const loadOffset = 10 - -func (g *GlyphBuf) loadSimple(glyf []byte, ne int) (program []byte) { - offset := loadOffset - for i := 0; i < ne; i++ { - g.End = append(g.End, 1+int(u16(glyf, offset))) - offset += 2 - } - - // Note the TrueType hinting instructions. - instrLen := int(u16(glyf, offset)) - offset += 2 - program = glyf[offset : offset+instrLen] - offset += instrLen - - np0 := len(g.Point) - np1 := np0 + int(g.End[len(g.End)-1]) - - // Decode the flags. - for i := np0; i < np1; { - c := uint32(glyf[offset]) - offset++ - g.Point = append(g.Point, Point{Flags: c}) - i++ - if c&flagRepeat != 0 { - count := glyf[offset] - offset++ - for ; count > 0; count-- { - g.Point = append(g.Point, Point{Flags: c}) - i++ - } - } - } - - // Decode the co-ordinates. - var x int16 - for i := np0; i < np1; i++ { - f := g.Point[i].Flags - if f&flagXShortVector != 0 { - dx := int16(glyf[offset]) - offset++ - if f&flagPositiveXShortVector == 0 { - x -= dx - } else { - x += dx - } - } else if f&flagThisXIsSame == 0 { - x += int16(u16(glyf, offset)) - offset += 2 - } - g.Point[i].X = int32(x) - } - var y int16 - for i := np0; i < np1; i++ { - f := g.Point[i].Flags - if f&flagYShortVector != 0 { - dy := int16(glyf[offset]) - offset++ - if f&flagPositiveYShortVector == 0 { - y -= dy - } else { - y += dy - } - } else if f&flagThisYIsSame == 0 { - y += int16(u16(glyf, offset)) - offset += 2 - } - g.Point[i].Y = int32(y) - } - - return program -} - -func (g *GlyphBuf) loadCompound(recursion int32, uhm HMetric, i Index, - glyf []byte, useMyMetrics bool) error { - - // Flags for decoding a compound glyph. These flags are documented at - // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html. - const ( - flagArg1And2AreWords = 1 << iota - flagArgsAreXYValues - flagRoundXYToGrid - flagWeHaveAScale - flagUnused - flagMoreComponents - flagWeHaveAnXAndYScale - flagWeHaveATwoByTwo - flagWeHaveInstructions - flagUseMyMetrics - flagOverlapCompound - ) - np0, ne0 := len(g.Point), len(g.End) - offset := loadOffset - for { - flags := u16(glyf, offset) - component := Index(u16(glyf, offset+2)) - dx, dy, transform, hasTransform := int32(0), int32(0), [4]int32{}, false - if flags&flagArg1And2AreWords != 0 { - dx = int32(int16(u16(glyf, offset+4))) - dy = int32(int16(u16(glyf, offset+6))) - offset += 8 - } else { - dx = int32(int16(int8(glyf[offset+4]))) - dy = int32(int16(int8(glyf[offset+5]))) - offset += 6 - } - if flags&flagArgsAreXYValues == 0 { - return UnsupportedError("compound glyph transform vector") - } - if flags&(flagWeHaveAScale|flagWeHaveAnXAndYScale|flagWeHaveATwoByTwo) != 0 { - hasTransform = true - switch { - case flags&flagWeHaveAScale != 0: - transform[0] = int32(int16(u16(glyf, offset+0))) - transform[3] = transform[0] - offset += 2 - case flags&flagWeHaveAnXAndYScale != 0: - transform[0] = int32(int16(u16(glyf, offset+0))) - transform[3] = int32(int16(u16(glyf, offset+2))) - offset += 4 - case flags&flagWeHaveATwoByTwo != 0: - transform[0] = int32(int16(u16(glyf, offset+0))) - transform[1] = int32(int16(u16(glyf, offset+2))) - transform[2] = int32(int16(u16(glyf, offset+4))) - transform[3] = int32(int16(u16(glyf, offset+6))) - offset += 8 - } - } - savedPP := g.phantomPoints - np0 := len(g.Point) - componentUMM := useMyMetrics && (flags&flagUseMyMetrics != 0) - if err := g.load(recursion+1, component, componentUMM); err != nil { - return err - } - if flags&flagUseMyMetrics == 0 { - g.phantomPoints = savedPP - } - if hasTransform { - for j := np0; j < len(g.Point); j++ { - p := &g.Point[j] - newX := int32((int64(p.X)*int64(transform[0])+1<<13)>>14) + - int32((int64(p.Y)*int64(transform[2])+1<<13)>>14) - newY := int32((int64(p.X)*int64(transform[1])+1<<13)>>14) + - int32((int64(p.Y)*int64(transform[3])+1<<13)>>14) - p.X, p.Y = newX, newY - } - } - dx = g.font.scale(g.scale * dx) - dy = g.font.scale(g.scale * dy) - if flags&flagRoundXYToGrid != 0 { - dx = (dx + 32) &^ 63 - dy = (dy + 32) &^ 63 - } - for j := np0; j < len(g.Point); j++ { - p := &g.Point[j] - p.X += dx - p.Y += dy - } - // TODO: also adjust g.InFontUnits and g.Unhinted? - if flags&flagMoreComponents == 0 { - break - } - } - - instrLen := 0 - if g.hinting != NoHinting && offset+2 <= len(glyf) { - instrLen = int(u16(glyf, offset)) - offset += 2 - } - - g.addPhantomsAndScale(np0, len(g.Point), false, instrLen > 0) - points, ends := g.Point[np0:], g.End[ne0:] - g.Point = g.Point[:len(g.Point)-4] - for j := range points { - points[j].Flags &^= flagTouchedX | flagTouchedY - } - - if instrLen == 0 { - if !g.metricsSet { - copy(g.phantomPoints[:], points[len(points)-4:]) - } - return nil - } - - // Hint the compound glyph. - program := glyf[offset : offset+instrLen] - // Temporarily adjust the ends to be relative to this compound glyph. - if np0 != 0 { - for i := range ends { - ends[i] -= np0 - } - } - // Hinting instructions of a composite glyph completely refer to the - // (already) hinted subglyphs. - g.tmp = append(g.tmp[:0], points...) - if err := g.hinter.run(program, points, g.tmp, g.tmp, ends); err != nil { - return err - } - if np0 != 0 { - for i := range ends { - ends[i] += np0 - } - } - if !g.metricsSet { - copy(g.phantomPoints[:], points[len(points)-4:]) - } - return nil -} - -func (g *GlyphBuf) addPhantomsAndScale(np0, np1 int, simple, adjust bool) { - // Add the four phantom points. - g.Point = append(g.Point, g.phantomPoints[:]...) - // Scale the points. - if simple && g.hinting != NoHinting { - g.InFontUnits = append(g.InFontUnits, g.Point[np1:]...) - } - for i := np1; i < len(g.Point); i++ { - p := &g.Point[i] - p.X = g.font.scale(g.scale * p.X) - p.Y = g.font.scale(g.scale * p.Y) - } - if g.hinting == NoHinting { - return - } - // Round the 1st phantom point to the grid, shifting all other points equally. - // Note that "all other points" starts from np0, not np1. - // TODO: delete this adjustment and the np0/np1 distinction, when - // we update the compatibility tests to C Freetype 2.5.3. - // See http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=05c786d990390a7ca18e62962641dac740bacb06 - if adjust { - pp1x := g.Point[len(g.Point)-4].X - if dx := ((pp1x + 32) &^ 63) - pp1x; dx != 0 { - for i := np0; i < len(g.Point); i++ { - g.Point[i].X += dx - } - } - } - if simple { - g.Unhinted = append(g.Unhinted, g.Point[np1:]...) - } - // Round the 2nd and 4th phantom point to the grid. - p := &g.Point[len(g.Point)-3] - p.X = (p.X + 32) &^ 63 - p = &g.Point[len(g.Point)-1] - p.Y = (p.Y + 32) &^ 63 -} - -// TODO: is this necessary? The zero-valued GlyphBuf is perfectly usable. - -// NewGlyphBuf returns a newly allocated GlyphBuf. -func NewGlyphBuf() *GlyphBuf { - return &GlyphBuf{ - Point: make([]Point, 0, 256), - End: make([]int, 0, 32), - } -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/hint.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/hint.go deleted file mode 100644 index 26c631436..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/hint.go +++ /dev/null @@ -1,1764 +0,0 @@ -// Copyright 2012 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package truetype - -// This file implements a Truetype bytecode interpreter. -// The opcodes are described at https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html - -import ( - "errors" - "math" -) - -const ( - twilightZone = 0 - glyphZone = 1 - numZone = 2 -) - -type pointType uint32 - -const ( - current pointType = 0 - unhinted pointType = 1 - inFontUnits pointType = 2 - numPointType = 3 -) - -// callStackEntry is a bytecode call stack entry. -type callStackEntry struct { - program []byte - pc int - loopCount int32 -} - -// hinter implements bytecode hinting. A hinter can be re-used to hint a series -// of glyphs from a Font. -type hinter struct { - stack, store []int32 - - // functions is a map from function number to bytecode. - functions map[int32][]byte - - // font and scale are the font and scale last used for this hinter. - // Changing the font will require running the new font's fpgm bytecode. - // Changing either will require running the font's prep bytecode. - font *Font - scale int32 - - // gs and defaultGS are the current and default graphics state. The - // default graphics state is the global default graphics state after - // the font's fpgm and prep programs have been run. - gs, defaultGS graphicsState - - // points and ends are the twilight zone's points, glyph's points - // and glyph's contour boundaries. - points [numZone][numPointType][]Point - ends []int - - // scaledCVT is the lazily initialized scaled Control Value Table. - scaledCVTInitialized bool - scaledCVT []f26dot6 -} - -// graphicsState is described at https://developer.apple.com/fonts/TTRefMan/RM04/Chap4.html -type graphicsState struct { - // Projection vector, freedom vector and dual projection vector. - pv, fv, dv [2]f2dot14 - // Reference points and zone pointers. - rp, zp [3]int32 - // Control Value / Single Width Cut-In. - controlValueCutIn, singleWidthCutIn, singleWidth f26dot6 - // Delta base / shift. - deltaBase, deltaShift int32 - // Minimum distance. - minDist f26dot6 - // Loop count. - loop int32 - // Rounding policy. - roundPeriod, roundPhase, roundThreshold f26dot6 - roundSuper45 bool - // Auto-flip. - autoFlip bool -} - -var globalDefaultGS = graphicsState{ - pv: [2]f2dot14{0x4000, 0}, // Unit vector along the X axis. - fv: [2]f2dot14{0x4000, 0}, - dv: [2]f2dot14{0x4000, 0}, - zp: [3]int32{1, 1, 1}, - controlValueCutIn: (17 << 6) / 16, // 17/16 as an f26dot6. - deltaBase: 9, - deltaShift: 3, - minDist: 1 << 6, // 1 as an f26dot6. - loop: 1, - roundPeriod: 1 << 6, // 1 as an f26dot6. - roundThreshold: 1 << 5, // 1/2 as an f26dot6. - roundSuper45: false, - autoFlip: true, -} - -func resetTwilightPoints(f *Font, p []Point) []Point { - if n := int(f.maxTwilightPoints) + 4; n <= cap(p) { - p = p[:n] - for i := range p { - p[i] = Point{} - } - } else { - p = make([]Point, n) - } - return p -} - -func (h *hinter) init(f *Font, scale int32) error { - h.points[twilightZone][0] = resetTwilightPoints(f, h.points[twilightZone][0]) - h.points[twilightZone][1] = resetTwilightPoints(f, h.points[twilightZone][1]) - h.points[twilightZone][2] = resetTwilightPoints(f, h.points[twilightZone][2]) - - rescale := h.scale != scale - if h.font != f { - h.font, rescale = f, true - if h.functions == nil { - h.functions = make(map[int32][]byte) - } else { - for k := range h.functions { - delete(h.functions, k) - } - } - - if x := int(f.maxStackElements); x > len(h.stack) { - x += 255 - x &^= 255 - h.stack = make([]int32, x) - } - if x := int(f.maxStorage); x > len(h.store) { - x += 15 - x &^= 15 - h.store = make([]int32, x) - } - if len(f.fpgm) != 0 { - if err := h.run(f.fpgm, nil, nil, nil, nil); err != nil { - return err - } - } - } - - if rescale { - h.scale = scale - h.scaledCVTInitialized = false - - h.defaultGS = globalDefaultGS - - if len(f.prep) != 0 { - if err := h.run(f.prep, nil, nil, nil, nil); err != nil { - return err - } - h.defaultGS = h.gs - // The MS rasterizer doesn't allow the following graphics state - // variables to be modified by the CVT program. - h.defaultGS.pv = globalDefaultGS.pv - h.defaultGS.fv = globalDefaultGS.fv - h.defaultGS.dv = globalDefaultGS.dv - h.defaultGS.rp = globalDefaultGS.rp - h.defaultGS.zp = globalDefaultGS.zp - h.defaultGS.loop = globalDefaultGS.loop - } - } - return nil -} - -func (h *hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point, ends []int) error { - h.gs = h.defaultGS - h.points[glyphZone][current] = pCurrent - h.points[glyphZone][unhinted] = pUnhinted - h.points[glyphZone][inFontUnits] = pInFontUnits - h.ends = ends - - if len(program) > 50000 { - return errors.New("truetype: hinting: too many instructions") - } - var ( - steps, pc, top int - opcode uint8 - - callStack [32]callStackEntry - callStackTop int - ) - - for 0 <= pc && pc < len(program) { - steps++ - if steps == 100000 { - return errors.New("truetype: hinting: too many steps") - } - opcode = program[pc] - if top < int(popCount[opcode]) { - return errors.New("truetype: hinting: stack underflow") - } - switch opcode { - - case opSVTCA0: - h.gs.pv = [2]f2dot14{0, 0x4000} - h.gs.fv = [2]f2dot14{0, 0x4000} - h.gs.dv = [2]f2dot14{0, 0x4000} - - case opSVTCA1: - h.gs.pv = [2]f2dot14{0x4000, 0} - h.gs.fv = [2]f2dot14{0x4000, 0} - h.gs.dv = [2]f2dot14{0x4000, 0} - - case opSPVTCA0: - h.gs.pv = [2]f2dot14{0, 0x4000} - h.gs.dv = [2]f2dot14{0, 0x4000} - - case opSPVTCA1: - h.gs.pv = [2]f2dot14{0x4000, 0} - h.gs.dv = [2]f2dot14{0x4000, 0} - - case opSFVTCA0: - h.gs.fv = [2]f2dot14{0, 0x4000} - - case opSFVTCA1: - h.gs.fv = [2]f2dot14{0x4000, 0} - - case opSPVTL0, opSPVTL1, opSFVTL0, opSFVTL1: - top -= 2 - p1 := h.point(0, current, h.stack[top+0]) - p2 := h.point(0, current, h.stack[top+1]) - if p1 == nil || p2 == nil { - return errors.New("truetype: hinting: point out of range") - } - dx := f2dot14(p1.X - p2.X) - dy := f2dot14(p1.Y - p2.Y) - if dx == 0 && dy == 0 { - dx = 0x4000 - } else if opcode&1 != 0 { - // Counter-clockwise rotation. - dx, dy = -dy, dx - } - v := normalize(dx, dy) - if opcode < opSFVTL0 { - h.gs.pv = v - h.gs.dv = v - } else { - h.gs.fv = v - } - - case opSPVFS: - top -= 2 - h.gs.pv = normalize(f2dot14(h.stack[top]), f2dot14(h.stack[top+1])) - h.gs.dv = h.gs.pv - - case opSFVFS: - top -= 2 - h.gs.fv = normalize(f2dot14(h.stack[top]), f2dot14(h.stack[top+1])) - - case opGPV: - if top+1 >= len(h.stack) { - return errors.New("truetype: hinting: stack overflow") - } - h.stack[top+0] = int32(h.gs.pv[0]) - h.stack[top+1] = int32(h.gs.pv[1]) - top += 2 - - case opGFV: - if top+1 >= len(h.stack) { - return errors.New("truetype: hinting: stack overflow") - } - h.stack[top+0] = int32(h.gs.fv[0]) - h.stack[top+1] = int32(h.gs.fv[1]) - top += 2 - - case opSFVTPV: - h.gs.fv = h.gs.pv - - case opISECT: - top -= 5 - p := h.point(2, current, h.stack[top+0]) - a0 := h.point(1, current, h.stack[top+1]) - a1 := h.point(1, current, h.stack[top+2]) - b0 := h.point(0, current, h.stack[top+3]) - b1 := h.point(0, current, h.stack[top+4]) - if p == nil || a0 == nil || a1 == nil || b0 == nil || b1 == nil { - return errors.New("truetype: hinting: point out of range") - } - - dbx := b1.X - b0.X - dby := b1.Y - b0.Y - dax := a1.X - a0.X - day := a1.Y - a0.Y - dx := b0.X - a0.X - dy := b0.Y - a0.Y - discriminant := mulDiv(int64(dax), int64(-dby), 0x40) + - mulDiv(int64(day), int64(dbx), 0x40) - dotProduct := mulDiv(int64(dax), int64(dbx), 0x40) + - mulDiv(int64(day), int64(dby), 0x40) - // The discriminant above is actually a cross product of vectors - // da and db. Together with the dot product, they can be used as - // surrogates for sine and cosine of the angle between the vectors. - // Indeed, - // dotproduct = |da||db|cos(angle) - // discriminant = |da||db|sin(angle) - // We use these equations to reject grazing intersections by - // thresholding abs(tan(angle)) at 1/19, corresponding to 3 degrees. - absDisc, absDotP := discriminant, dotProduct - if absDisc < 0 { - absDisc = -absDisc - } - if absDotP < 0 { - absDotP = -absDotP - } - if 19*absDisc > absDotP { - val := mulDiv(int64(dx), int64(-dby), 0x40) + - mulDiv(int64(dy), int64(dbx), 0x40) - rx := mulDiv(val, int64(dax), discriminant) - ry := mulDiv(val, int64(day), discriminant) - p.X = a0.X + int32(rx) - p.Y = a0.Y + int32(ry) - } else { - p.X = (a0.X + a1.X + b0.X + b1.X) / 4 - p.Y = (a0.Y + a1.Y + b0.Y + b1.Y) / 4 - } - p.Flags |= flagTouchedX | flagTouchedY - - case opSRP0, opSRP1, opSRP2: - top-- - h.gs.rp[opcode-opSRP0] = h.stack[top] - - case opSZP0, opSZP1, opSZP2: - top-- - h.gs.zp[opcode-opSZP0] = h.stack[top] - - case opSZPS: - top-- - h.gs.zp[0] = h.stack[top] - h.gs.zp[1] = h.stack[top] - h.gs.zp[2] = h.stack[top] - - case opSLOOP: - top-- - if h.stack[top] <= 0 { - return errors.New("truetype: hinting: invalid data") - } - h.gs.loop = h.stack[top] - - case opRTG: - h.gs.roundPeriod = 1 << 6 - h.gs.roundPhase = 0 - h.gs.roundThreshold = 1 << 5 - h.gs.roundSuper45 = false - - case opRTHG: - h.gs.roundPeriod = 1 << 6 - h.gs.roundPhase = 1 << 5 - h.gs.roundThreshold = 1 << 5 - h.gs.roundSuper45 = false - - case opSMD: - top-- - h.gs.minDist = f26dot6(h.stack[top]) - - case opELSE: - opcode = 1 - goto ifelse - - case opJMPR: - top-- - pc += int(h.stack[top]) - continue - - case opSCVTCI: - top-- - h.gs.controlValueCutIn = f26dot6(h.stack[top]) - - case opSSWCI: - top-- - h.gs.singleWidthCutIn = f26dot6(h.stack[top]) - - case opSSW: - top-- - h.gs.singleWidth = f26dot6(h.font.scale(h.scale * h.stack[top])) - - case opDUP: - if top >= len(h.stack) { - return errors.New("truetype: hinting: stack overflow") - } - h.stack[top] = h.stack[top-1] - top++ - - case opPOP: - top-- - - case opCLEAR: - top = 0 - - case opSWAP: - h.stack[top-1], h.stack[top-2] = h.stack[top-2], h.stack[top-1] - - case opDEPTH: - if top >= len(h.stack) { - return errors.New("truetype: hinting: stack overflow") - } - h.stack[top] = int32(top) - top++ - - case opCINDEX, opMINDEX: - x := int(h.stack[top-1]) - if x <= 0 || x >= top { - return errors.New("truetype: hinting: invalid data") - } - h.stack[top-1] = h.stack[top-1-x] - if opcode == opMINDEX { - copy(h.stack[top-1-x:top-1], h.stack[top-x:top]) - top-- - } - - case opALIGNPTS: - top -= 2 - p := h.point(1, current, h.stack[top]) - q := h.point(0, current, h.stack[top+1]) - if p == nil || q == nil { - return errors.New("truetype: hinting: point out of range") - } - d := dotProduct(f26dot6(q.X-p.X), f26dot6(q.Y-p.Y), h.gs.pv) / 2 - h.move(p, +d, true) - h.move(q, -d, true) - - case opUTP: - top-- - p := h.point(0, current, h.stack[top]) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - p.Flags &^= flagTouchedX | flagTouchedY - - case opLOOPCALL, opCALL: - if callStackTop >= len(callStack) { - return errors.New("truetype: hinting: call stack overflow") - } - top-- - f, ok := h.functions[h.stack[top]] - if !ok { - return errors.New("truetype: hinting: undefined function") - } - callStack[callStackTop] = callStackEntry{program, pc, 1} - if opcode == opLOOPCALL { - top-- - if h.stack[top] == 0 { - break - } - callStack[callStackTop].loopCount = h.stack[top] - } - callStackTop++ - program, pc = f, 0 - continue - - case opFDEF: - // Save all bytecode up until the next ENDF. - startPC := pc + 1 - fdefloop: - for { - pc++ - if pc >= len(program) { - return errors.New("truetype: hinting: unbalanced FDEF") - } - switch program[pc] { - case opFDEF: - return errors.New("truetype: hinting: nested FDEF") - case opENDF: - top-- - h.functions[h.stack[top]] = program[startPC : pc+1] - break fdefloop - default: - var ok bool - pc, ok = skipInstructionPayload(program, pc) - if !ok { - return errors.New("truetype: hinting: unbalanced FDEF") - } - } - } - - case opENDF: - if callStackTop == 0 { - return errors.New("truetype: hinting: call stack underflow") - } - callStackTop-- - callStack[callStackTop].loopCount-- - if callStack[callStackTop].loopCount != 0 { - callStackTop++ - pc = 0 - continue - } - program, pc = callStack[callStackTop].program, callStack[callStackTop].pc - - case opMDAP0, opMDAP1: - top-- - i := h.stack[top] - p := h.point(0, current, i) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - distance := f26dot6(0) - if opcode == opMDAP1 { - distance = dotProduct(f26dot6(p.X), f26dot6(p.Y), h.gs.pv) - // TODO: metrics compensation. - distance = h.round(distance) - distance - } - h.move(p, distance, true) - h.gs.rp[0] = i - h.gs.rp[1] = i - - case opIUP0, opIUP1: - iupY, mask := opcode == opIUP0, uint32(flagTouchedX) - if iupY { - mask = flagTouchedY - } - prevEnd := 0 - for _, end := range h.ends { - for i := prevEnd; i < end; i++ { - for i < end && h.points[glyphZone][current][i].Flags&mask == 0 { - i++ - } - if i == end { - break - } - firstTouched, curTouched := i, i - i++ - for ; i < end; i++ { - if h.points[glyphZone][current][i].Flags&mask != 0 { - h.iupInterp(iupY, curTouched+1, i-1, curTouched, i) - curTouched = i - } - } - if curTouched == firstTouched { - h.iupShift(iupY, prevEnd, end, curTouched) - } else { - h.iupInterp(iupY, curTouched+1, end-1, curTouched, firstTouched) - if firstTouched > 0 { - h.iupInterp(iupY, prevEnd, firstTouched-1, curTouched, firstTouched) - } - } - } - prevEnd = end - } - - case opSHP0, opSHP1: - if top < int(h.gs.loop) { - return errors.New("truetype: hinting: stack underflow") - } - _, _, d, ok := h.displacement(opcode&1 == 0) - if !ok { - return errors.New("truetype: hinting: point out of range") - } - for ; h.gs.loop != 0; h.gs.loop-- { - top-- - p := h.point(2, current, h.stack[top]) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - h.move(p, d, true) - } - h.gs.loop = 1 - - case opSHC0, opSHC1: - top-- - zonePointer, i, d, ok := h.displacement(opcode&1 == 0) - if !ok { - return errors.New("truetype: hinting: point out of range") - } - if h.gs.zp[2] == 0 { - // TODO: implement this when we have a glyph that does this. - return errors.New("hinting: unimplemented SHC instruction") - } - contour := h.stack[top] - if contour < 0 || len(ends) <= int(contour) { - return errors.New("truetype: hinting: contour out of range") - } - j0, j1 := int32(0), int32(h.ends[contour]) - if contour > 0 { - j0 = int32(h.ends[contour-1]) - } - move := h.gs.zp[zonePointer] != h.gs.zp[2] - for j := j0; j < j1; j++ { - if move || j != i { - h.move(h.point(2, current, j), d, true) - } - } - - case opSHZ0, opSHZ1: - top-- - zonePointer, i, d, ok := h.displacement(opcode&1 == 0) - if !ok { - return errors.New("truetype: hinting: point out of range") - } - - // As per C Freetype, SHZ doesn't move the phantom points, or mark - // the points as touched. - limit := int32(len(h.points[h.gs.zp[2]][current])) - if h.gs.zp[2] == glyphZone { - limit -= 4 - } - for j := int32(0); j < limit; j++ { - if i != j || h.gs.zp[zonePointer] != h.gs.zp[2] { - h.move(h.point(2, current, j), d, false) - } - } - - case opSHPIX: - top-- - d := f26dot6(h.stack[top]) - if top < int(h.gs.loop) { - return errors.New("truetype: hinting: stack underflow") - } - for ; h.gs.loop != 0; h.gs.loop-- { - top-- - p := h.point(2, current, h.stack[top]) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - h.move(p, d, true) - } - h.gs.loop = 1 - - case opIP: - if top < int(h.gs.loop) { - return errors.New("truetype: hinting: stack underflow") - } - pointType := inFontUnits - twilight := h.gs.zp[0] == 0 || h.gs.zp[1] == 0 || h.gs.zp[2] == 0 - if twilight { - pointType = unhinted - } - p := h.point(1, pointType, h.gs.rp[2]) - oldP := h.point(0, pointType, h.gs.rp[1]) - oldRange := dotProduct(f26dot6(p.X-oldP.X), f26dot6(p.Y-oldP.Y), h.gs.dv) - - p = h.point(1, current, h.gs.rp[2]) - curP := h.point(0, current, h.gs.rp[1]) - curRange := dotProduct(f26dot6(p.X-curP.X), f26dot6(p.Y-curP.Y), h.gs.pv) - for ; h.gs.loop != 0; h.gs.loop-- { - top-- - i := h.stack[top] - p = h.point(2, pointType, i) - oldDist := dotProduct(f26dot6(p.X-oldP.X), f26dot6(p.Y-oldP.Y), h.gs.dv) - p = h.point(2, current, i) - curDist := dotProduct(f26dot6(p.X-curP.X), f26dot6(p.Y-curP.Y), h.gs.pv) - newDist := f26dot6(0) - if oldDist != 0 { - if oldRange != 0 { - newDist = f26dot6(mulDiv(int64(oldDist), int64(curRange), int64(oldRange))) - } else { - newDist = -oldDist - } - } - h.move(p, newDist-curDist, true) - } - h.gs.loop = 1 - - case opMSIRP0, opMSIRP1: - top -= 2 - i := h.stack[top] - distance := f26dot6(h.stack[top+1]) - - // TODO: special case h.gs.zp[1] == 0 in C Freetype. - ref := h.point(0, current, h.gs.rp[0]) - p := h.point(1, current, i) - if ref == nil || p == nil { - return errors.New("truetype: hinting: point out of range") - } - curDist := dotProduct(f26dot6(p.X-ref.X), f26dot6(p.Y-ref.Y), h.gs.pv) - - // Set-RP0 bit. - if opcode == opMSIRP1 { - h.gs.rp[0] = i - } - h.gs.rp[1] = h.gs.rp[0] - h.gs.rp[2] = i - - // Move the point. - h.move(p, distance-curDist, true) - - case opALIGNRP: - if top < int(h.gs.loop) { - return errors.New("truetype: hinting: stack underflow") - } - ref := h.point(0, current, h.gs.rp[0]) - if ref == nil { - return errors.New("truetype: hinting: point out of range") - } - for ; h.gs.loop != 0; h.gs.loop-- { - top-- - p := h.point(1, current, h.stack[top]) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - h.move(p, -dotProduct(f26dot6(p.X-ref.X), f26dot6(p.Y-ref.Y), h.gs.pv), true) - } - h.gs.loop = 1 - - case opRTDG: - h.gs.roundPeriod = 1 << 5 - h.gs.roundPhase = 0 - h.gs.roundThreshold = 1 << 4 - h.gs.roundSuper45 = false - - case opMIAP0, opMIAP1: - top -= 2 - i := h.stack[top] - distance := h.getScaledCVT(h.stack[top+1]) - if h.gs.zp[0] == 0 { - p := h.point(0, unhinted, i) - q := h.point(0, current, i) - p.X = int32((int64(distance) * int64(h.gs.fv[0])) >> 14) - p.Y = int32((int64(distance) * int64(h.gs.fv[1])) >> 14) - *q = *p - } - p := h.point(0, current, i) - oldDist := dotProduct(f26dot6(p.X), f26dot6(p.Y), h.gs.pv) - if opcode == opMIAP1 { - if (distance - oldDist).abs() > h.gs.controlValueCutIn { - distance = oldDist - } - // TODO: metrics compensation. - distance = h.round(distance) - } - h.move(p, distance-oldDist, true) - h.gs.rp[0] = i - h.gs.rp[1] = i - - case opNPUSHB: - opcode = 0 - goto push - - case opNPUSHW: - opcode = 0x80 - goto push - - case opWS: - top -= 2 - i := int(h.stack[top]) - if i < 0 || len(h.store) <= i { - return errors.New("truetype: hinting: invalid data") - } - h.store[i] = h.stack[top+1] - - case opRS: - i := int(h.stack[top-1]) - if i < 0 || len(h.store) <= i { - return errors.New("truetype: hinting: invalid data") - } - h.stack[top-1] = h.store[i] - - case opWCVTP: - top -= 2 - h.setScaledCVT(h.stack[top], f26dot6(h.stack[top+1])) - - case opRCVT: - h.stack[top-1] = int32(h.getScaledCVT(h.stack[top-1])) - - case opGC0, opGC1: - i := h.stack[top-1] - if opcode == opGC0 { - p := h.point(2, current, i) - h.stack[top-1] = int32(dotProduct(f26dot6(p.X), f26dot6(p.Y), h.gs.pv)) - } else { - p := h.point(2, unhinted, i) - // Using dv as per C Freetype. - h.stack[top-1] = int32(dotProduct(f26dot6(p.X), f26dot6(p.Y), h.gs.dv)) - } - - case opSCFS: - top -= 2 - i := h.stack[top] - p := h.point(2, current, i) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - c := dotProduct(f26dot6(p.X), f26dot6(p.Y), h.gs.pv) - h.move(p, f26dot6(h.stack[top+1])-c, true) - if h.gs.zp[2] != 0 { - break - } - q := h.point(2, unhinted, i) - if q == nil { - return errors.New("truetype: hinting: point out of range") - } - q.X = p.X - q.Y = p.Y - - case opMD0, opMD1: - top-- - pt, v, scale := pointType(0), [2]f2dot14{}, false - if opcode == opMD0 { - pt = current - v = h.gs.pv - } else if h.gs.zp[0] == 0 || h.gs.zp[1] == 0 { - pt = unhinted - v = h.gs.dv - } else { - pt = inFontUnits - v = h.gs.dv - scale = true - } - p := h.point(0, pt, h.stack[top-1]) - q := h.point(1, pt, h.stack[top]) - if p == nil || q == nil { - return errors.New("truetype: hinting: point out of range") - } - d := int32(dotProduct(f26dot6(p.X-q.X), f26dot6(p.Y-q.Y), v)) - if scale { - d = int32(int64(d*h.scale) / int64(h.font.fUnitsPerEm)) - } - h.stack[top-1] = d - - case opMPPEM, opMPS: - if top >= len(h.stack) { - return errors.New("truetype: hinting: stack overflow") - } - // For MPS, point size should be irrelevant; we return the PPEM. - h.stack[top] = h.scale >> 6 - top++ - - case opFLIPON, opFLIPOFF: - h.gs.autoFlip = opcode == opFLIPON - - case opDEBUG: - // No-op. - - case opLT: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] < h.stack[top]) - - case opLTEQ: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] <= h.stack[top]) - - case opGT: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] > h.stack[top]) - - case opGTEQ: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] >= h.stack[top]) - - case opEQ: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] == h.stack[top]) - - case opNEQ: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] != h.stack[top]) - - case opODD, opEVEN: - i := h.round(f26dot6(h.stack[top-1])) >> 6 - h.stack[top-1] = int32(i&1) ^ int32(opcode-opODD) - - case opIF: - top-- - if h.stack[top] == 0 { - opcode = 0 - goto ifelse - } - - case opEIF: - // No-op. - - case opAND: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1] != 0 && h.stack[top] != 0) - - case opOR: - top-- - h.stack[top-1] = bool2int32(h.stack[top-1]|h.stack[top] != 0) - - case opNOT: - h.stack[top-1] = bool2int32(h.stack[top-1] == 0) - - case opDELTAP1: - goto delta - - case opSDB: - top-- - h.gs.deltaBase = h.stack[top] - - case opSDS: - top-- - h.gs.deltaShift = h.stack[top] - - case opADD: - top-- - h.stack[top-1] += h.stack[top] - - case opSUB: - top-- - h.stack[top-1] -= h.stack[top] - - case opDIV: - top-- - if h.stack[top] == 0 { - return errors.New("truetype: hinting: division by zero") - } - h.stack[top-1] = int32(f26dot6(h.stack[top-1]).div(f26dot6(h.stack[top]))) - - case opMUL: - top-- - h.stack[top-1] = int32(f26dot6(h.stack[top-1]).mul(f26dot6(h.stack[top]))) - - case opABS: - if h.stack[top-1] < 0 { - h.stack[top-1] = -h.stack[top-1] - } - - case opNEG: - h.stack[top-1] = -h.stack[top-1] - - case opFLOOR: - h.stack[top-1] &^= 63 - - case opCEILING: - h.stack[top-1] += 63 - h.stack[top-1] &^= 63 - - case opROUND00, opROUND01, opROUND10, opROUND11: - // The four flavors of opROUND are equivalent. See the comment below on - // opNROUND for the rationale. - h.stack[top-1] = int32(h.round(f26dot6(h.stack[top-1]))) - - case opNROUND00, opNROUND01, opNROUND10, opNROUND11: - // No-op. The spec says to add one of four "compensations for the engine - // characteristics", to cater for things like "different dot-size printers". - // https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#engine_compensation - // This code does not implement engine compensation, as we don't expect to - // be used to output on dot-matrix printers. - - case opWCVTF: - top -= 2 - h.setScaledCVT(h.stack[top], f26dot6(h.font.scale(h.scale*h.stack[top+1]))) - - case opDELTAP2, opDELTAP3, opDELTAC1, opDELTAC2, opDELTAC3: - goto delta - - case opSROUND, opS45ROUND: - top-- - switch (h.stack[top] >> 6) & 0x03 { - case 0: - h.gs.roundPeriod = 1 << 5 - case 1, 3: - h.gs.roundPeriod = 1 << 6 - case 2: - h.gs.roundPeriod = 1 << 7 - } - h.gs.roundSuper45 = opcode == opS45ROUND - if h.gs.roundSuper45 { - // The spec says to multiply by √2, but the C Freetype code says 1/√2. - // We go with 1/√2. - h.gs.roundPeriod *= 46341 - h.gs.roundPeriod /= 65536 - } - h.gs.roundPhase = h.gs.roundPeriod * f26dot6((h.stack[top]>>4)&0x03) / 4 - if x := h.stack[top] & 0x0f; x != 0 { - h.gs.roundThreshold = h.gs.roundPeriod * f26dot6(x-4) / 8 - } else { - h.gs.roundThreshold = h.gs.roundPeriod - 1 - } - - case opJROT: - top -= 2 - if h.stack[top+1] != 0 { - pc += int(h.stack[top]) - continue - } - - case opJROF: - top -= 2 - if h.stack[top+1] == 0 { - pc += int(h.stack[top]) - continue - } - - case opROFF: - h.gs.roundPeriod = 0 - h.gs.roundPhase = 0 - h.gs.roundThreshold = 0 - h.gs.roundSuper45 = false - - case opRUTG: - h.gs.roundPeriod = 1 << 6 - h.gs.roundPhase = 0 - h.gs.roundThreshold = 1<<6 - 1 - h.gs.roundSuper45 = false - - case opRDTG: - h.gs.roundPeriod = 1 << 6 - h.gs.roundPhase = 0 - h.gs.roundThreshold = 0 - h.gs.roundSuper45 = false - - case opSANGW, opAA: - // These ops are "anachronistic" and no longer used. - top-- - - case opFLIPPT: - if top < int(h.gs.loop) { - return errors.New("truetype: hinting: stack underflow") - } - points := h.points[glyphZone][current] - for ; h.gs.loop != 0; h.gs.loop-- { - top-- - i := h.stack[top] - if i < 0 || len(points) <= int(i) { - return errors.New("truetype: hinting: point out of range") - } - points[i].Flags ^= flagOnCurve - } - h.gs.loop = 1 - - case opFLIPRGON, opFLIPRGOFF: - top -= 2 - i, j, points := h.stack[top], h.stack[top+1], h.points[glyphZone][current] - if i < 0 || len(points) <= int(i) || j < 0 || len(points) <= int(j) { - return errors.New("truetype: hinting: point out of range") - } - for ; i <= j; i++ { - if opcode == opFLIPRGON { - points[i].Flags |= flagOnCurve - } else { - points[i].Flags &^= flagOnCurve - } - } - - case opSCANCTRL: - // We do not support dropout control, as we always rasterize grayscale glyphs. - top-- - - case opSDPVTL0, opSDPVTL1: - top -= 2 - for i := 0; i < 2; i++ { - pt := unhinted - if i != 0 { - pt = current - } - p := h.point(1, pt, h.stack[top]) - q := h.point(2, pt, h.stack[top+1]) - if p == nil || q == nil { - return errors.New("truetype: hinting: point out of range") - } - dx := f2dot14(p.X - q.X) - dy := f2dot14(p.Y - q.Y) - if dx == 0 && dy == 0 { - dx = 0x4000 - } else if opcode&1 != 0 { - // Counter-clockwise rotation. - dx, dy = -dy, dx - } - if i == 0 { - h.gs.dv = normalize(dx, dy) - } else { - h.gs.pv = normalize(dx, dy) - } - } - - case opGETINFO: - res := int32(0) - if h.stack[top-1]&(1<<0) != 0 { - // Set the engine version. We hard-code this to 35, the same as - // the C freetype code, which says that "Version~35 corresponds - // to MS rasterizer v.1.7 as used e.g. in Windows~98". - res |= 35 - } - if h.stack[top-1]&(1<<5) != 0 { - // Set that we support grayscale. - res |= 1 << 12 - } - // We set no other bits, as we do not support rotated or stretched glyphs. - h.stack[top-1] = res - - case opIDEF: - // IDEF is for ancient versions of the bytecode interpreter, and is no longer used. - return errors.New("truetype: hinting: unsupported IDEF instruction") - - case opROLL: - h.stack[top-1], h.stack[top-3], h.stack[top-2] = - h.stack[top-3], h.stack[top-2], h.stack[top-1] - - case opMAX: - top-- - if h.stack[top-1] < h.stack[top] { - h.stack[top-1] = h.stack[top] - } - - case opMIN: - top-- - if h.stack[top-1] > h.stack[top] { - h.stack[top-1] = h.stack[top] - } - - case opSCANTYPE: - // We do not support dropout control, as we always rasterize grayscale glyphs. - top-- - - case opINSTCTRL: - // TODO: support instruction execution control? It seems rare, and even when - // nominally used (e.g. Source Sans Pro), it seems conditional on extreme or - // unusual rasterization conditions. For example, the code snippet at - // https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html#INSTCTRL - // uses INSTCTRL when grid-fitting a rotated or stretched glyph, but - // freetype-go does not support rotated or stretched glyphs. - top -= 2 - - default: - if opcode < opPUSHB000 { - return errors.New("truetype: hinting: unrecognized instruction") - } - - if opcode < opMDRP00000 { - // PUSHxxxx opcode. - - if opcode < opPUSHW000 { - opcode -= opPUSHB000 - 1 - } else { - opcode -= opPUSHW000 - 1 - 0x80 - } - goto push - } - - if opcode < opMIRP00000 { - // MDRPxxxxx opcode. - - top-- - i := h.stack[top] - ref := h.point(0, current, h.gs.rp[0]) - p := h.point(1, current, i) - if ref == nil || p == nil { - return errors.New("truetype: hinting: point out of range") - } - - oldDist := f26dot6(0) - if h.gs.zp[0] == 0 || h.gs.zp[1] == 0 { - p0 := h.point(1, unhinted, i) - p1 := h.point(0, unhinted, h.gs.rp[0]) - oldDist = dotProduct(f26dot6(p0.X-p1.X), f26dot6(p0.Y-p1.Y), h.gs.dv) - } else { - p0 := h.point(1, inFontUnits, i) - p1 := h.point(0, inFontUnits, h.gs.rp[0]) - oldDist = dotProduct(f26dot6(p0.X-p1.X), f26dot6(p0.Y-p1.Y), h.gs.dv) - oldDist = f26dot6(h.font.scale(h.scale * int32(oldDist))) - } - - // Single-width cut-in test. - if x := (oldDist - h.gs.singleWidth).abs(); x < h.gs.singleWidthCutIn { - if oldDist >= 0 { - oldDist = +h.gs.singleWidth - } else { - oldDist = -h.gs.singleWidth - } - } - - // Rounding bit. - // TODO: metrics compensation. - distance := oldDist - if opcode&0x04 != 0 { - distance = h.round(oldDist) - } - - // Minimum distance bit. - if opcode&0x08 != 0 { - if oldDist >= 0 { - if distance < h.gs.minDist { - distance = h.gs.minDist - } - } else { - if distance > -h.gs.minDist { - distance = -h.gs.minDist - } - } - } - - // Set-RP0 bit. - h.gs.rp[1] = h.gs.rp[0] - h.gs.rp[2] = i - if opcode&0x10 != 0 { - h.gs.rp[0] = i - } - - // Move the point. - oldDist = dotProduct(f26dot6(p.X-ref.X), f26dot6(p.Y-ref.Y), h.gs.pv) - h.move(p, distance-oldDist, true) - - } else { - // MIRPxxxxx opcode. - - top -= 2 - i := h.stack[top] - cvtDist := h.getScaledCVT(h.stack[top+1]) - if (cvtDist - h.gs.singleWidth).abs() < h.gs.singleWidthCutIn { - if cvtDist >= 0 { - cvtDist = +h.gs.singleWidth - } else { - cvtDist = -h.gs.singleWidth - } - } - - if h.gs.zp[1] == 0 { - // TODO: implement once we have a .ttf file that triggers - // this, so that we can step through C's freetype. - return errors.New("truetype: hinting: unimplemented twilight point adjustment") - } - - ref := h.point(0, unhinted, h.gs.rp[0]) - p := h.point(1, unhinted, i) - if ref == nil || p == nil { - return errors.New("truetype: hinting: point out of range") - } - oldDist := dotProduct(f26dot6(p.X-ref.X), f26dot6(p.Y-ref.Y), h.gs.dv) - - ref = h.point(0, current, h.gs.rp[0]) - p = h.point(1, current, i) - if ref == nil || p == nil { - return errors.New("truetype: hinting: point out of range") - } - curDist := dotProduct(f26dot6(p.X-ref.X), f26dot6(p.Y-ref.Y), h.gs.pv) - - if h.gs.autoFlip && oldDist^cvtDist < 0 { - cvtDist = -cvtDist - } - - // Rounding bit. - // TODO: metrics compensation. - distance := cvtDist - if opcode&0x04 != 0 { - // The CVT value is only used if close enough to oldDist. - if (h.gs.zp[0] == h.gs.zp[1]) && - ((cvtDist - oldDist).abs() > h.gs.controlValueCutIn) { - - distance = oldDist - } - distance = h.round(distance) - } - - // Minimum distance bit. - if opcode&0x08 != 0 { - if oldDist >= 0 { - if distance < h.gs.minDist { - distance = h.gs.minDist - } - } else { - if distance > -h.gs.minDist { - distance = -h.gs.minDist - } - } - } - - // Set-RP0 bit. - h.gs.rp[1] = h.gs.rp[0] - h.gs.rp[2] = i - if opcode&0x10 != 0 { - h.gs.rp[0] = i - } - - // Move the point. - h.move(p, distance-curDist, true) - } - } - pc++ - continue - - ifelse: - // Skip past bytecode until the next ELSE (if opcode == 0) or the - // next EIF (for all opcodes). Opcode == 0 means that we have come - // from an IF. Opcode == 1 means that we have come from an ELSE. - { - ifelseloop: - for depth := 0; ; { - pc++ - if pc >= len(program) { - return errors.New("truetype: hinting: unbalanced IF or ELSE") - } - switch program[pc] { - case opIF: - depth++ - case opELSE: - if depth == 0 && opcode == 0 { - break ifelseloop - } - case opEIF: - depth-- - if depth < 0 { - break ifelseloop - } - default: - var ok bool - pc, ok = skipInstructionPayload(program, pc) - if !ok { - return errors.New("truetype: hinting: unbalanced IF or ELSE") - } - } - } - pc++ - continue - } - - push: - // Push n elements from the program to the stack, where n is the low 7 bits of - // opcode. If the low 7 bits are zero, then n is the next byte from the program. - // The high bit being 0 means that the elements are zero-extended bytes. - // The high bit being 1 means that the elements are sign-extended words. - { - width := 1 - if opcode&0x80 != 0 { - opcode &^= 0x80 - width = 2 - } - if opcode == 0 { - pc++ - if pc >= len(program) { - return errors.New("truetype: hinting: insufficient data") - } - opcode = program[pc] - } - pc++ - if top+int(opcode) > len(h.stack) { - return errors.New("truetype: hinting: stack overflow") - } - if pc+width*int(opcode) > len(program) { - return errors.New("truetype: hinting: insufficient data") - } - for ; opcode > 0; opcode-- { - if width == 1 { - h.stack[top] = int32(program[pc]) - } else { - h.stack[top] = int32(int8(program[pc]))<<8 | int32(program[pc+1]) - } - top++ - pc += width - } - continue - } - - delta: - { - if opcode >= opDELTAC1 && !h.scaledCVTInitialized { - h.initializeScaledCVT() - } - top-- - n := h.stack[top] - if int32(top) < 2*n { - return errors.New("truetype: hinting: stack underflow") - } - for ; n > 0; n-- { - top -= 2 - b := h.stack[top] - c := (b & 0xf0) >> 4 - switch opcode { - case opDELTAP2, opDELTAC2: - c += 16 - case opDELTAP3, opDELTAC3: - c += 32 - } - c += h.gs.deltaBase - if ppem := (h.scale + 1<<5) >> 6; ppem != c { - continue - } - b = (b & 0x0f) - 8 - if b >= 0 { - b++ - } - b = b * 64 / (1 << uint32(h.gs.deltaShift)) - if opcode >= opDELTAC1 { - a := h.stack[top+1] - if a < 0 || len(h.scaledCVT) <= int(a) { - return errors.New("truetype: hinting: index out of range") - } - h.scaledCVT[a] += f26dot6(b) - } else { - p := h.point(0, current, h.stack[top+1]) - if p == nil { - return errors.New("truetype: hinting: point out of range") - } - h.move(p, f26dot6(b), true) - } - } - pc++ - continue - } - } - return nil -} - -func (h *hinter) initializeScaledCVT() { - h.scaledCVTInitialized = true - if n := len(h.font.cvt) / 2; n <= cap(h.scaledCVT) { - h.scaledCVT = h.scaledCVT[:n] - } else { - if n < 32 { - n = 32 - } - h.scaledCVT = make([]f26dot6, len(h.font.cvt)/2, n) - } - for i := range h.scaledCVT { - unscaled := uint16(h.font.cvt[2*i])<<8 | uint16(h.font.cvt[2*i+1]) - h.scaledCVT[i] = f26dot6(h.font.scale(h.scale * int32(int16(unscaled)))) - } -} - -// getScaledCVT returns the scaled value from the font's Control Value Table. -func (h *hinter) getScaledCVT(i int32) f26dot6 { - if !h.scaledCVTInitialized { - h.initializeScaledCVT() - } - if i < 0 || len(h.scaledCVT) <= int(i) { - return 0 - } - return h.scaledCVT[i] -} - -// setScaledCVT overrides the scaled value from the font's Control Value Table. -func (h *hinter) setScaledCVT(i int32, v f26dot6) { - if !h.scaledCVTInitialized { - h.initializeScaledCVT() - } - if i < 0 || len(h.scaledCVT) <= int(i) { - return - } - h.scaledCVT[i] = v -} - -func (h *hinter) point(zonePointer uint32, pt pointType, i int32) *Point { - points := h.points[h.gs.zp[zonePointer]][pt] - if i < 0 || len(points) <= int(i) { - return nil - } - return &points[i] -} - -func (h *hinter) move(p *Point, distance f26dot6, touch bool) { - fvx := int64(h.gs.fv[0]) - pvx := int64(h.gs.pv[0]) - if fvx == 0x4000 && pvx == 0x4000 { - p.X += int32(distance) - if touch { - p.Flags |= flagTouchedX - } - return - } - - fvy := int64(h.gs.fv[1]) - pvy := int64(h.gs.pv[1]) - if fvy == 0x4000 && pvy == 0x4000 { - p.Y += int32(distance) - if touch { - p.Flags |= flagTouchedY - } - return - } - - fvDotPv := (fvx*pvx + fvy*pvy) >> 14 - - if fvx != 0 { - p.X += int32(mulDiv(fvx, int64(distance), fvDotPv)) - if touch { - p.Flags |= flagTouchedX - } - } - - if fvy != 0 { - p.Y += int32(mulDiv(fvy, int64(distance), fvDotPv)) - if touch { - p.Flags |= flagTouchedY - } - } -} - -func (h *hinter) iupInterp(interpY bool, p1, p2, ref1, ref2 int) { - if p1 > p2 { - return - } - if ref1 >= len(h.points[glyphZone][current]) || - ref2 >= len(h.points[glyphZone][current]) { - return - } - - var ifu1, ifu2 int32 - if interpY { - ifu1 = h.points[glyphZone][inFontUnits][ref1].Y - ifu2 = h.points[glyphZone][inFontUnits][ref2].Y - } else { - ifu1 = h.points[glyphZone][inFontUnits][ref1].X - ifu2 = h.points[glyphZone][inFontUnits][ref2].X - } - if ifu1 > ifu2 { - ifu1, ifu2 = ifu2, ifu1 - ref1, ref2 = ref2, ref1 - } - - var unh1, unh2, delta1, delta2 int32 - if interpY { - unh1 = h.points[glyphZone][unhinted][ref1].Y - unh2 = h.points[glyphZone][unhinted][ref2].Y - delta1 = h.points[glyphZone][current][ref1].Y - unh1 - delta2 = h.points[glyphZone][current][ref2].Y - unh2 - } else { - unh1 = h.points[glyphZone][unhinted][ref1].X - unh2 = h.points[glyphZone][unhinted][ref2].X - delta1 = h.points[glyphZone][current][ref1].X - unh1 - delta2 = h.points[glyphZone][current][ref2].X - unh2 - } - - var xy, ifuXY int32 - if ifu1 == ifu2 { - for i := p1; i <= p2; i++ { - if interpY { - xy = h.points[glyphZone][unhinted][i].Y - } else { - xy = h.points[glyphZone][unhinted][i].X - } - - if xy <= unh1 { - xy += delta1 - } else { - xy += delta2 - } - - if interpY { - h.points[glyphZone][current][i].Y = xy - } else { - h.points[glyphZone][current][i].X = xy - } - } - return - } - - scale, scaleOK := int64(0), false - for i := p1; i <= p2; i++ { - if interpY { - xy = h.points[glyphZone][unhinted][i].Y - ifuXY = h.points[glyphZone][inFontUnits][i].Y - } else { - xy = h.points[glyphZone][unhinted][i].X - ifuXY = h.points[glyphZone][inFontUnits][i].X - } - - if xy <= unh1 { - xy += delta1 - } else if xy >= unh2 { - xy += delta2 - } else { - if !scaleOK { - scaleOK = true - scale = mulDiv(int64(unh2+delta2-unh1-delta1), 0x10000, int64(ifu2-ifu1)) - } - numer := int64(ifuXY-ifu1) * scale - if numer >= 0 { - numer += 0x8000 - } else { - numer -= 0x8000 - } - xy = unh1 + delta1 + int32(numer/0x10000) - } - - if interpY { - h.points[glyphZone][current][i].Y = xy - } else { - h.points[glyphZone][current][i].X = xy - } - } -} - -func (h *hinter) iupShift(interpY bool, p1, p2, p int) { - var delta int32 - if interpY { - delta = h.points[glyphZone][current][p].Y - h.points[glyphZone][unhinted][p].Y - } else { - delta = h.points[glyphZone][current][p].X - h.points[glyphZone][unhinted][p].X - } - if delta == 0 { - return - } - for i := p1; i < p2; i++ { - if i == p { - continue - } - if interpY { - h.points[glyphZone][current][i].Y += delta - } else { - h.points[glyphZone][current][i].X += delta - } - } -} - -func (h *hinter) displacement(useZP1 bool) (zonePointer uint32, i int32, d f26dot6, ok bool) { - zonePointer, i = uint32(0), h.gs.rp[1] - if useZP1 { - zonePointer, i = 1, h.gs.rp[2] - } - p := h.point(zonePointer, current, i) - q := h.point(zonePointer, unhinted, i) - if p == nil || q == nil { - return 0, 0, 0, false - } - d = dotProduct(f26dot6(p.X-q.X), f26dot6(p.Y-q.Y), h.gs.pv) - return zonePointer, i, d, true -} - -// skipInstructionPayload increments pc by the extra data that follows a -// variable length PUSHB or PUSHW instruction. -func skipInstructionPayload(program []byte, pc int) (newPC int, ok bool) { - switch program[pc] { - case opNPUSHB: - pc++ - if pc >= len(program) { - return 0, false - } - pc += int(program[pc]) - case opNPUSHW: - pc++ - if pc >= len(program) { - return 0, false - } - pc += 2 * int(program[pc]) - case opPUSHB000, opPUSHB001, opPUSHB010, opPUSHB011, - opPUSHB100, opPUSHB101, opPUSHB110, opPUSHB111: - pc += int(program[pc] - (opPUSHB000 - 1)) - case opPUSHW000, opPUSHW001, opPUSHW010, opPUSHW011, - opPUSHW100, opPUSHW101, opPUSHW110, opPUSHW111: - pc += 2 * int(program[pc]-(opPUSHW000-1)) - } - return pc, true -} - -// f2dot14 is a 2.14 fixed point number. -type f2dot14 int16 - -func normalize(x, y f2dot14) [2]f2dot14 { - fx, fy := float64(x), float64(y) - l := 0x4000 / math.Hypot(fx, fy) - fx *= l - if fx >= 0 { - fx += 0.5 - } else { - fx -= 0.5 - } - fy *= l - if fy >= 0 { - fy += 0.5 - } else { - fy -= 0.5 - } - return [2]f2dot14{f2dot14(fx), f2dot14(fy)} -} - -// f26dot6 is a 26.6 fixed point number. -type f26dot6 int32 - -// abs returns abs(x) in 26.6 fixed point arithmetic. -func (x f26dot6) abs() f26dot6 { - if x < 0 { - return -x - } - return x -} - -// div returns x/y in 26.6 fixed point arithmetic. -func (x f26dot6) div(y f26dot6) f26dot6 { - return f26dot6((int64(x) << 6) / int64(y)) -} - -// mul returns x*y in 26.6 fixed point arithmetic. -func (x f26dot6) mul(y f26dot6) f26dot6 { - return f26dot6((int64(x)*int64(y) + 1<<5) >> 6) -} - -// dotProduct returns the dot product of [x, y] and q. It is almost the same as -// px := int64(x) -// py := int64(y) -// qx := int64(q[0]) -// qy := int64(q[1]) -// return f26dot6((px*qx + py*qy + 1<<13) >> 14) -// except that the computation is done with 32-bit integers to produce exactly -// the same rounding behavior as C Freetype. -func dotProduct(x, y f26dot6, q [2]f2dot14) f26dot6 { - // Compute x*q[0] as 64-bit value. - l := uint32((int32(x) & 0xFFFF) * int32(q[0])) - m := (int32(x) >> 16) * int32(q[0]) - - lo1 := l + (uint32(m) << 16) - hi1 := (m >> 16) + (int32(l) >> 31) + bool2int32(lo1 < l) - - // Compute y*q[1] as 64-bit value. - l = uint32((int32(y) & 0xFFFF) * int32(q[1])) - m = (int32(y) >> 16) * int32(q[1]) - - lo2 := l + (uint32(m) << 16) - hi2 := (m >> 16) + (int32(l) >> 31) + bool2int32(lo2 < l) - - // Add them. - lo := lo1 + lo2 - hi := hi1 + hi2 + bool2int32(lo < lo1) - - // Divide the result by 2^14 with rounding. - s := hi >> 31 - l = lo + uint32(s) - hi += s + bool2int32(l < lo) - lo = l - - l = lo + 0x2000 - hi += bool2int32(l < lo) - - return f26dot6((uint32(hi) << 18) | (l >> 14)) -} - -// mulDiv returns x*y/z, rounded to the nearest integer. -func mulDiv(x, y, z int64) int64 { - xy := x * y - if z < 0 { - xy, z = -xy, -z - } - if xy >= 0 { - xy += z / 2 - } else { - xy -= z / 2 - } - return xy / z -} - -// round rounds the given number. The rounding algorithm is described at -// https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding -func (h *hinter) round(x f26dot6) f26dot6 { - if h.gs.roundPeriod == 0 { - // Rounding is off. - return x - } - if x >= 0 { - ret := x - h.gs.roundPhase + h.gs.roundThreshold - if h.gs.roundSuper45 { - ret /= h.gs.roundPeriod - ret *= h.gs.roundPeriod - } else { - ret &= -h.gs.roundPeriod - } - if x != 0 && ret < 0 { - ret = 0 - } - return ret + h.gs.roundPhase - } - ret := -x - h.gs.roundPhase + h.gs.roundThreshold - if h.gs.roundSuper45 { - ret /= h.gs.roundPeriod - ret *= h.gs.roundPeriod - } else { - ret &= -h.gs.roundPeriod - } - if ret < 0 { - ret = 0 - } - return -ret - h.gs.roundPhase -} - -func bool2int32(b bool) int32 { - if b { - return 1 - } - return 0 -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/hint_test.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/hint_test.go deleted file mode 100644 index c8b8d604d..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/hint_test.go +++ /dev/null @@ -1,673 +0,0 @@ -// Copyright 2012 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package truetype - -import ( - "reflect" - "strings" - "testing" -) - -func TestBytecode(t *testing.T) { - testCases := []struct { - desc string - prog []byte - want []int32 - errStr string - }{ - { - "underflow", - []byte{ - opDUP, - }, - nil, - "underflow", - }, - { - "infinite loop", - []byte{ - opPUSHW000, // [-1] - 0xff, - 0xff, - opDUP, // [-1, -1] - opJMPR, // [-1] - }, - nil, - "too many steps", - }, - { - "unbalanced if/else", - []byte{ - opPUSHB000, // [0] - 0, - opIF, - }, - nil, - "unbalanced", - }, - { - "vector set/gets", - []byte{ - opSVTCA1, // [] - opGPV, // [0x4000, 0] - opSVTCA0, // [0x4000, 0] - opGFV, // [0x4000, 0, 0, 0x4000] - opNEG, // [0x4000, 0, 0, -0x4000] - opSPVFS, // [0x4000, 0] - opSFVTPV, // [0x4000, 0] - opPUSHB000, // [0x4000, 0, 1] - 1, - opGFV, // [0x4000, 0, 1, 0, -0x4000] - opPUSHB000, // [0x4000, 0, 1, 0, -0x4000, 2] - 2, - }, - []int32{0x4000, 0, 1, 0, -0x4000, 2}, - "", - }, - { - "jumps", - []byte{ - opPUSHB001, // [10, 2] - 10, - 2, - opJMPR, // [10] - opDUP, // not executed - opDUP, // [10, 10] - opPUSHB010, // [10, 10, 20, 2, 1] - 20, - 2, - 1, - opJROT, // [10, 10, 20] - opDUP, // not executed - opDUP, // [10, 10, 20, 20] - opPUSHB010, // [10, 10, 20, 20, 30, 2, 1] - 30, - 2, - 1, - opJROF, // [10, 10, 20, 20, 30] - opDUP, // [10, 10, 20, 20, 30, 30] - opDUP, // [10, 10, 20, 20, 30, 30, 30] - }, - []int32{10, 10, 20, 20, 30, 30, 30}, - "", - }, - { - "stack ops", - []byte{ - opPUSHB010, // [10, 20, 30] - 10, - 20, - 30, - opCLEAR, // [] - opPUSHB010, // [40, 50, 60] - 40, - 50, - 60, - opSWAP, // [40, 60, 50] - opDUP, // [40, 60, 50, 50] - opDUP, // [40, 60, 50, 50, 50] - opPOP, // [40, 60, 50, 50] - opDEPTH, // [40, 60, 50, 50, 4] - opCINDEX, // [40, 60, 50, 50, 40] - opPUSHB000, // [40, 60, 50, 50, 40, 4] - 4, - opMINDEX, // [40, 50, 50, 40, 60] - }, - []int32{40, 50, 50, 40, 60}, - "", - }, - { - "push ops", - []byte{ - opPUSHB000, // [255] - 255, - opPUSHW001, // [255, -2, 253] - 255, - 254, - 0, - 253, - opNPUSHB, // [1, -2, 253, 1, 2] - 2, - 1, - 2, - opNPUSHW, // [1, -2, 253, 1, 2, 0x0405, 0x0607, 0x0809] - 3, - 4, - 5, - 6, - 7, - 8, - 9, - }, - []int32{255, -2, 253, 1, 2, 0x0405, 0x0607, 0x0809}, - "", - }, - { - "store ops", - []byte{ - opPUSHB011, // [1, 22, 3, 44] - 1, - 22, - 3, - 44, - opWS, // [1, 22] - opWS, // [] - opPUSHB000, // [3] - 3, - opRS, // [44] - }, - []int32{44}, - "", - }, - { - "comparison ops", - []byte{ - opPUSHB001, // [10, 20] - 10, - 20, - opLT, // [1] - opPUSHB001, // [1, 10, 20] - 10, - 20, - opLTEQ, // [1, 1] - opPUSHB001, // [1, 1, 10, 20] - 10, - 20, - opGT, // [1, 1, 0] - opPUSHB001, // [1, 1, 0, 10, 20] - 10, - 20, - opGTEQ, // [1, 1, 0, 0] - opEQ, // [1, 1, 1] - opNEQ, // [1, 0] - }, - []int32{1, 0}, - "", - }, - { - "odd/even", - // Calculate odd(2+31/64), odd(2+32/64), even(2), even(1). - []byte{ - opPUSHB000, // [159] - 159, - opODD, // [0] - opPUSHB000, // [0, 160] - 160, - opODD, // [0, 1] - opPUSHB000, // [0, 1, 128] - 128, - opEVEN, // [0, 1, 1] - opPUSHB000, // [0, 1, 1, 64] - 64, - opEVEN, // [0, 1, 1, 0] - }, - []int32{0, 1, 1, 0}, - "", - }, - { - "if true", - []byte{ - opPUSHB001, // [255, 1] - 255, - 1, - opIF, - opPUSHB000, // [255, 2] - 2, - opEIF, - opPUSHB000, // [255, 2, 254] - 254, - }, - []int32{255, 2, 254}, - "", - }, - { - "if false", - []byte{ - opPUSHB001, // [255, 0] - 255, - 0, - opIF, - opPUSHB000, // [255] - 2, - opEIF, - opPUSHB000, // [255, 254] - 254, - }, - []int32{255, 254}, - "", - }, - { - "if/else true", - []byte{ - opPUSHB000, // [1] - 1, - opIF, - opPUSHB000, // [2] - 2, - opELSE, - opPUSHB000, // not executed - 3, - opEIF, - }, - []int32{2}, - "", - }, - { - "if/else false", - []byte{ - opPUSHB000, // [0] - 0, - opIF, - opPUSHB000, // not executed - 2, - opELSE, - opPUSHB000, // [3] - 3, - opEIF, - }, - []int32{3}, - "", - }, - { - "if/else true if/else false", - // 0x58 is the opcode for opIF. The literal 0x58s below are pushed data. - []byte{ - opPUSHB010, // [255, 0, 1] - 255, - 0, - 1, - opIF, - opIF, - opPUSHB001, // not executed - 0x58, - 0x58, - opELSE, - opPUSHW000, // [255, 0x5858] - 0x58, - 0x58, - opEIF, - opELSE, - opIF, - opNPUSHB, // not executed - 3, - 0x58, - 0x58, - 0x58, - opELSE, - opNPUSHW, // not executed - 2, - 0x58, - 0x58, - 0x58, - 0x58, - opEIF, - opEIF, - opPUSHB000, // [255, 0x5858, 254] - 254, - }, - []int32{255, 0x5858, 254}, - "", - }, - { - "if/else false if/else true", - // 0x58 is the opcode for opIF. The literal 0x58s below are pushed data. - []byte{ - opPUSHB010, // [255, 1, 0] - 255, - 1, - 0, - opIF, - opIF, - opPUSHB001, // not executed - 0x58, - 0x58, - opELSE, - opPUSHW000, // not executed - 0x58, - 0x58, - opEIF, - opELSE, - opIF, - opNPUSHB, // [255, 0x58, 0x58, 0x58] - 3, - 0x58, - 0x58, - 0x58, - opELSE, - opNPUSHW, // not executed - 2, - 0x58, - 0x58, - 0x58, - 0x58, - opEIF, - opEIF, - opPUSHB000, // [255, 0x58, 0x58, 0x58, 254] - 254, - }, - []int32{255, 0x58, 0x58, 0x58, 254}, - "", - }, - { - "logical ops", - []byte{ - opPUSHB010, // [0, 10, 20] - 0, - 10, - 20, - opAND, // [0, 1] - opOR, // [1] - opNOT, // [0] - }, - []int32{0}, - "", - }, - { - "arithmetic ops", - // Calculate abs((-(1 - (2*3)))/2 + 1/64). - // The answer is 5/2 + 1/64 in ideal numbers, or 161 in 26.6 fixed point math. - []byte{ - opPUSHB010, // [64, 128, 192] - 1 << 6, - 2 << 6, - 3 << 6, - opMUL, // [64, 384] - opSUB, // [-320] - opNEG, // [320] - opPUSHB000, // [320, 128] - 2 << 6, - opDIV, // [160] - opPUSHB000, // [160, 1] - 1, - opADD, // [161] - opABS, // [161] - }, - []int32{161}, - "", - }, - { - "floor, ceiling", - []byte{ - opPUSHB000, // [96] - 96, - opFLOOR, // [64] - opPUSHB000, // [64, 96] - 96, - opCEILING, // [64, 128] - }, - []int32{64, 128}, - "", - }, - { - "rounding", - // Round 1.40625 (which is 90/64) under various rounding policies. - // See figure 20 of https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding - []byte{ - opROFF, // [] - opPUSHB000, // [90] - 90, - opROUND00, // [90] - opRTG, // [90] - opPUSHB000, // [90, 90] - 90, - opROUND00, // [90, 64] - opRTHG, // [90, 64] - opPUSHB000, // [90, 64, 90] - 90, - opROUND00, // [90, 64, 96] - opRDTG, // [90, 64, 96] - opPUSHB000, // [90, 64, 96, 90] - 90, - opROUND00, // [90, 64, 96, 64] - opRUTG, // [90, 64, 96, 64] - opPUSHB000, // [90, 64, 96, 64, 90] - 90, - opROUND00, // [90, 64, 96, 64, 128] - opRTDG, // [90, 64, 96, 64, 128] - opPUSHB000, // [90, 64, 96, 64, 128, 90] - 90, - opROUND00, // [90, 64, 96, 64, 128, 96] - }, - []int32{90, 64, 96, 64, 128, 96}, - "", - }, - { - "super-rounding", - // See figure 20 of https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding - // and the sign preservation steps of the "Order of rounding operations" section. - []byte{ - opPUSHB000, // [0x58] - 0x58, - opSROUND, // [] - opPUSHW000, // [-81] - 0xff, - 0xaf, - opROUND00, // [-80] - opPUSHW000, // [-80, -80] - 0xff, - 0xb0, - opROUND00, // [-80, -80] - opPUSHW000, // [-80, -80, -17] - 0xff, - 0xef, - opROUND00, // [-80, -80, -16] - opPUSHW000, // [-80, -80, -16, -16] - 0xff, - 0xf0, - opROUND00, // [-80, -80, -16, -16] - opPUSHB000, // [-80, -80, -16, -16, 0] - 0, - opROUND00, // [-80, -80, -16, -16, 16] - opPUSHB000, // [-80, -80, -16, -16, 16, 16] - 16, - opROUND00, // [-80, -80, -16, -16, 16, 16] - opPUSHB000, // [-80, -80, -16, -16, 16, 16, 47] - 47, - opROUND00, // [-80, -80, -16, -16, 16, 16, 16] - opPUSHB000, // [-80, -80, -16, -16, 16, 16, 16, 48] - 48, - opROUND00, // [-80, -80, -16, -16, 16, 16, 16, 80] - }, - []int32{-80, -80, -16, -16, 16, 16, 16, 80}, - "", - }, - { - "roll", - []byte{ - opPUSHB010, // [1, 2, 3] - 1, - 2, - 3, - opROLL, // [2, 3, 1] - }, - []int32{2, 3, 1}, - "", - }, - { - "max/min", - []byte{ - opPUSHW001, // [-2, -3] - 0xff, - 0xfe, - 0xff, - 0xfd, - opMAX, // [-2] - opPUSHW001, // [-2, -4, -5] - 0xff, - 0xfc, - 0xff, - 0xfb, - opMIN, // [-2, -5] - }, - []int32{-2, -5}, - "", - }, - { - "functions", - []byte{ - opPUSHB011, // [3, 7, 0, 3] - 3, - 7, - 0, - 3, - - opFDEF, // Function #3 (not called) - opPUSHB000, - 98, - opENDF, - - opFDEF, // Function #0 - opDUP, - opADD, - opENDF, - - opFDEF, // Function #7 - opPUSHB001, - 10, - 0, - opCALL, - opDUP, - opENDF, - - opFDEF, // Function #3 (again) - opPUSHB000, - 99, - opENDF, - - opPUSHB001, // [2, 0] - 2, - 0, - opCALL, // [4] - opPUSHB000, // [4, 3] - 3, - opLOOPCALL, // [99, 99, 99, 99] - opPUSHB000, // [99, 99, 99, 99, 7] - 7, - opCALL, // [99, 99, 99, 99, 20, 20] - }, - []int32{99, 99, 99, 99, 20, 20}, - "", - }, - } - - for _, tc := range testCases { - h := &hinter{} - h.init(&Font{ - maxStorage: 32, - maxStackElements: 100, - }, 768) - err, errStr := h.run(tc.prog, nil, nil, nil, nil), "" - if err != nil { - errStr = err.Error() - } - if tc.errStr != "" { - if errStr == "" { - t.Errorf("%s: got no error, want %q", tc.desc, tc.errStr) - } else if !strings.Contains(errStr, tc.errStr) { - t.Errorf("%s: got error %q, want one containing %q", tc.desc, errStr, tc.errStr) - } - continue - } - if errStr != "" { - t.Errorf("%s: got error %q, want none", tc.desc, errStr) - continue - } - got := h.stack[:len(tc.want)] - if !reflect.DeepEqual(got, tc.want) { - t.Errorf("%s: got %v, want %v", tc.desc, got, tc.want) - continue - } - } -} - -// TestMove tests that the hinter.move method matches the output of the C -// Freetype implementation. -func TestMove(t *testing.T) { - h, p := hinter{}, Point{} - testCases := []struct { - pvX, pvY, fvX, fvY f2dot14 - wantX, wantY int32 - }{ - {+0x4000, +0x0000, +0x4000, +0x0000, +1000, +0}, - {+0x4000, +0x0000, -0x4000, +0x0000, +1000, +0}, - {-0x4000, +0x0000, +0x4000, +0x0000, -1000, +0}, - {-0x4000, +0x0000, -0x4000, +0x0000, -1000, +0}, - {+0x0000, +0x4000, +0x0000, +0x4000, +0, +1000}, - {+0x0000, +0x4000, +0x0000, -0x4000, +0, +1000}, - {+0x4000, +0x0000, +0x2d41, +0x2d41, +1000, +1000}, - {+0x4000, +0x0000, -0x2d41, +0x2d41, +1000, -1000}, - {+0x4000, +0x0000, +0x2d41, -0x2d41, +1000, -1000}, - {+0x4000, +0x0000, -0x2d41, -0x2d41, +1000, +1000}, - {-0x4000, +0x0000, +0x2d41, +0x2d41, -1000, -1000}, - {-0x4000, +0x0000, -0x2d41, +0x2d41, -1000, +1000}, - {-0x4000, +0x0000, +0x2d41, -0x2d41, -1000, +1000}, - {-0x4000, +0x0000, -0x2d41, -0x2d41, -1000, -1000}, - {+0x376d, +0x2000, +0x2d41, +0x2d41, +732, +732}, - {-0x376d, +0x2000, +0x2d41, +0x2d41, -2732, -2732}, - {+0x376d, +0x2000, +0x2d41, -0x2d41, +2732, -2732}, - {-0x376d, +0x2000, +0x2d41, -0x2d41, -732, +732}, - {-0x376d, -0x2000, +0x2d41, +0x2d41, -732, -732}, - {+0x376d, +0x2000, +0x4000, +0x0000, +1155, +0}, - {+0x376d, +0x2000, +0x0000, +0x4000, +0, +2000}, - } - for _, tc := range testCases { - p = Point{} - h.gs.pv = [2]f2dot14{tc.pvX, tc.pvY} - h.gs.fv = [2]f2dot14{tc.fvX, tc.fvY} - h.move(&p, 1000, true) - tx := p.Flags&flagTouchedX != 0 - ty := p.Flags&flagTouchedY != 0 - wantTX := tc.fvX != 0 - wantTY := tc.fvY != 0 - if p.X != tc.wantX || p.Y != tc.wantY || tx != wantTX || ty != wantTY { - t.Errorf("pv=%v, fv=%v\ngot %d, %d, %t, %t\nwant %d, %d, %t, %t", - h.gs.pv, h.gs.fv, p.X, p.Y, tx, ty, tc.wantX, tc.wantY, wantTX, wantTY) - continue - } - - // Check that p is aligned with the freedom vector. - a := int64(p.X) * int64(tc.fvY) - b := int64(p.Y) * int64(tc.fvX) - if a != b { - t.Errorf("pv=%v, fv=%v, p=%v not aligned with fv", h.gs.pv, h.gs.fv, p) - continue - } - - // Check that the projected p is 1000 away from the origin. - dotProd := (int64(p.X)*int64(tc.pvX) + int64(p.Y)*int64(tc.pvY) + 1<<13) >> 14 - if dotProd != 1000 { - t.Errorf("pv=%v, fv=%v, p=%v not 1000 from origin", h.gs.pv, h.gs.fv, p) - continue - } - } -} - -// TestNormalize tests that the normalize function matches the output of the C -// Freetype implementation. -func TestNormalize(t *testing.T) { - testCases := [][2]f2dot14{ - {-15895, 3974}, - {-15543, 5181}, - {-14654, 7327}, - {-11585, 11585}, - {0, 16384}, - {11585, 11585}, - {14654, 7327}, - {15543, 5181}, - {15895, 3974}, - {16066, 3213}, - {16161, 2694}, - {16219, 2317}, - {16257, 2032}, - {16284, 1809}, - } - for i, want := range testCases { - got := normalize(f2dot14(i)-4, 1) - if got != want { - t.Errorf("i=%d: got %v, want %v", i, got, want) - } - } -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/opcodes.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/opcodes.go deleted file mode 100644 index 1880e1e63..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/opcodes.go +++ /dev/null @@ -1,289 +0,0 @@ -// Copyright 2012 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package truetype - -// The Truetype opcodes are summarized at -// https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html - -const ( - opSVTCA0 = 0x00 // Set freedom and projection Vectors To Coordinate Axis - opSVTCA1 = 0x01 // . - opSPVTCA0 = 0x02 // Set Projection Vector To Coordinate Axis - opSPVTCA1 = 0x03 // . - opSFVTCA0 = 0x04 // Set Freedom Vector to Coordinate Axis - opSFVTCA1 = 0x05 // . - opSPVTL0 = 0x06 // Set Projection Vector To Line - opSPVTL1 = 0x07 // . - opSFVTL0 = 0x08 // Set Freedom Vector To Line - opSFVTL1 = 0x09 // . - opSPVFS = 0x0a // Set Projection Vector From Stack - opSFVFS = 0x0b // Set Freedom Vector From Stack - opGPV = 0x0c // Get Projection Vector - opGFV = 0x0d // Get Freedom Vector - opSFVTPV = 0x0e // Set Freedom Vector To Projection Vector - opISECT = 0x0f // moves point p to the InterSECTion of two lines - opSRP0 = 0x10 // Set Reference Point 0 - opSRP1 = 0x11 // Set Reference Point 1 - opSRP2 = 0x12 // Set Reference Point 2 - opSZP0 = 0x13 // Set Zone Pointer 0 - opSZP1 = 0x14 // Set Zone Pointer 1 - opSZP2 = 0x15 // Set Zone Pointer 2 - opSZPS = 0x16 // Set Zone PointerS - opSLOOP = 0x17 // Set LOOP variable - opRTG = 0x18 // Round To Grid - opRTHG = 0x19 // Round To Half Grid - opSMD = 0x1a // Set Minimum Distance - opELSE = 0x1b // ELSE clause - opJMPR = 0x1c // JuMP Relative - opSCVTCI = 0x1d // Set Control Value Table Cut-In - opSSWCI = 0x1e // Set Single Width Cut-In - opSSW = 0x1f // Set Single Width - opDUP = 0x20 // DUPlicate top stack element - opPOP = 0x21 // POP top stack element - opCLEAR = 0x22 // CLEAR the stack - opSWAP = 0x23 // SWAP the top two elements on the stack - opDEPTH = 0x24 // DEPTH of the stack - opCINDEX = 0x25 // Copy the INDEXed element to the top of the stack - opMINDEX = 0x26 // Move the INDEXed element to the top of the stack - opALIGNPTS = 0x27 // ALIGN PoinTS - op_0x28 = 0x28 // deprecated - opUTP = 0x29 // UnTouch Point - opLOOPCALL = 0x2a // LOOP and CALL function - opCALL = 0x2b // CALL function - opFDEF = 0x2c // Function DEFinition - opENDF = 0x2d // END Function definition - opMDAP0 = 0x2e // Move Direct Absolute Point - opMDAP1 = 0x2f // . - opIUP0 = 0x30 // Interpolate Untouched Points through the outline - opIUP1 = 0x31 // . - opSHP0 = 0x32 // SHift Point using reference point - opSHP1 = 0x33 // . - opSHC0 = 0x34 // SHift Contour using reference point - opSHC1 = 0x35 // . - opSHZ0 = 0x36 // SHift Zone using reference point - opSHZ1 = 0x37 // . - opSHPIX = 0x38 // SHift point by a PIXel amount - opIP = 0x39 // Interpolate Point - opMSIRP0 = 0x3a // Move Stack Indirect Relative Point - opMSIRP1 = 0x3b // . - opALIGNRP = 0x3c // ALIGN to Reference Point - opRTDG = 0x3d // Round To Double Grid - opMIAP0 = 0x3e // Move Indirect Absolute Point - opMIAP1 = 0x3f // . - opNPUSHB = 0x40 // PUSH N Bytes - opNPUSHW = 0x41 // PUSH N Words - opWS = 0x42 // Write Store - opRS = 0x43 // Read Store - opWCVTP = 0x44 // Write Control Value Table in Pixel units - opRCVT = 0x45 // Read Control Value Table entry - opGC0 = 0x46 // Get Coordinate projected onto the projection vector - opGC1 = 0x47 // . - opSCFS = 0x48 // Sets Coordinate From the Stack using projection vector and freedom vector - opMD0 = 0x49 // Measure Distance - opMD1 = 0x4a // . - opMPPEM = 0x4b // Measure Pixels Per EM - opMPS = 0x4c // Measure Point Size - opFLIPON = 0x4d // set the auto FLIP Boolean to ON - opFLIPOFF = 0x4e // set the auto FLIP Boolean to OFF - opDEBUG = 0x4f // DEBUG call - opLT = 0x50 // Less Than - opLTEQ = 0x51 // Less Than or EQual - opGT = 0x52 // Greater Than - opGTEQ = 0x53 // Greater Than or EQual - opEQ = 0x54 // EQual - opNEQ = 0x55 // Not EQual - opODD = 0x56 // ODD - opEVEN = 0x57 // EVEN - opIF = 0x58 // IF test - opEIF = 0x59 // End IF - opAND = 0x5a // logical AND - opOR = 0x5b // logical OR - opNOT = 0x5c // logical NOT - opDELTAP1 = 0x5d // DELTA exception P1 - opSDB = 0x5e // Set Delta Base in the graphics state - opSDS = 0x5f // Set Delta Shift in the graphics state - opADD = 0x60 // ADD - opSUB = 0x61 // SUBtract - opDIV = 0x62 // DIVide - opMUL = 0x63 // MULtiply - opABS = 0x64 // ABSolute value - opNEG = 0x65 // NEGate - opFLOOR = 0x66 // FLOOR - opCEILING = 0x67 // CEILING - opROUND00 = 0x68 // ROUND value - opROUND01 = 0x69 // . - opROUND10 = 0x6a // . - opROUND11 = 0x6b // . - opNROUND00 = 0x6c // No ROUNDing of value - opNROUND01 = 0x6d // . - opNROUND10 = 0x6e // . - opNROUND11 = 0x6f // . - opWCVTF = 0x70 // Write Control Value Table in Funits - opDELTAP2 = 0x71 // DELTA exception P2 - opDELTAP3 = 0x72 // DELTA exception P3 - opDELTAC1 = 0x73 // DELTA exception C1 - opDELTAC2 = 0x74 // DELTA exception C2 - opDELTAC3 = 0x75 // DELTA exception C3 - opSROUND = 0x76 // Super ROUND - opS45ROUND = 0x77 // Super ROUND 45 degrees - opJROT = 0x78 // Jump Relative On True - opJROF = 0x79 // Jump Relative On False - opROFF = 0x7a // Round OFF - op_0x7b = 0x7b // deprecated - opRUTG = 0x7c // Round Up To Grid - opRDTG = 0x7d // Round Down To Grid - opSANGW = 0x7e // Set ANGle Weight - opAA = 0x7f // Adjust Angle - opFLIPPT = 0x80 // FLIP PoinT - opFLIPRGON = 0x81 // FLIP RanGe ON - opFLIPRGOFF = 0x82 // FLIP RanGe OFF - op_0x83 = 0x83 // deprecated - op_0x84 = 0x84 // deprecated - opSCANCTRL = 0x85 // SCAN conversion ConTRoL - opSDPVTL0 = 0x86 // Set Dual Projection Vector To Line - opSDPVTL1 = 0x87 // . - opGETINFO = 0x88 // GET INFOrmation - opIDEF = 0x89 // Instruction DEFinition - opROLL = 0x8a // ROLL the top three stack elements - opMAX = 0x8b // MAXimum of top two stack elements - opMIN = 0x8c // MINimum of top two stack elements - opSCANTYPE = 0x8d // SCANTYPE - opINSTCTRL = 0x8e // INSTRuction execution ConTRoL - op_0x8f = 0x8f - op_0x90 = 0x90 - op_0x91 = 0x91 - op_0x92 = 0x92 - op_0x93 = 0x93 - op_0x94 = 0x94 - op_0x95 = 0x95 - op_0x96 = 0x96 - op_0x97 = 0x97 - op_0x98 = 0x98 - op_0x99 = 0x99 - op_0x9a = 0x9a - op_0x9b = 0x9b - op_0x9c = 0x9c - op_0x9d = 0x9d - op_0x9e = 0x9e - op_0x9f = 0x9f - op_0xa0 = 0xa0 - op_0xa1 = 0xa1 - op_0xa2 = 0xa2 - op_0xa3 = 0xa3 - op_0xa4 = 0xa4 - op_0xa5 = 0xa5 - op_0xa6 = 0xa6 - op_0xa7 = 0xa7 - op_0xa8 = 0xa8 - op_0xa9 = 0xa9 - op_0xaa = 0xaa - op_0xab = 0xab - op_0xac = 0xac - op_0xad = 0xad - op_0xae = 0xae - op_0xaf = 0xaf - opPUSHB000 = 0xb0 // PUSH Bytes - opPUSHB001 = 0xb1 // . - opPUSHB010 = 0xb2 // . - opPUSHB011 = 0xb3 // . - opPUSHB100 = 0xb4 // . - opPUSHB101 = 0xb5 // . - opPUSHB110 = 0xb6 // . - opPUSHB111 = 0xb7 // . - opPUSHW000 = 0xb8 // PUSH Words - opPUSHW001 = 0xb9 // . - opPUSHW010 = 0xba // . - opPUSHW011 = 0xbb // . - opPUSHW100 = 0xbc // . - opPUSHW101 = 0xbd // . - opPUSHW110 = 0xbe // . - opPUSHW111 = 0xbf // . - opMDRP00000 = 0xc0 // Move Direct Relative Point - opMDRP00001 = 0xc1 // . - opMDRP00010 = 0xc2 // . - opMDRP00011 = 0xc3 // . - opMDRP00100 = 0xc4 // . - opMDRP00101 = 0xc5 // . - opMDRP00110 = 0xc6 // . - opMDRP00111 = 0xc7 // . - opMDRP01000 = 0xc8 // . - opMDRP01001 = 0xc9 // . - opMDRP01010 = 0xca // . - opMDRP01011 = 0xcb // . - opMDRP01100 = 0xcc // . - opMDRP01101 = 0xcd // . - opMDRP01110 = 0xce // . - opMDRP01111 = 0xcf // . - opMDRP10000 = 0xd0 // . - opMDRP10001 = 0xd1 // . - opMDRP10010 = 0xd2 // . - opMDRP10011 = 0xd3 // . - opMDRP10100 = 0xd4 // . - opMDRP10101 = 0xd5 // . - opMDRP10110 = 0xd6 // . - opMDRP10111 = 0xd7 // . - opMDRP11000 = 0xd8 // . - opMDRP11001 = 0xd9 // . - opMDRP11010 = 0xda // . - opMDRP11011 = 0xdb // . - opMDRP11100 = 0xdc // . - opMDRP11101 = 0xdd // . - opMDRP11110 = 0xde // . - opMDRP11111 = 0xdf // . - opMIRP00000 = 0xe0 // Move Indirect Relative Point - opMIRP00001 = 0xe1 // . - opMIRP00010 = 0xe2 // . - opMIRP00011 = 0xe3 // . - opMIRP00100 = 0xe4 // . - opMIRP00101 = 0xe5 // . - opMIRP00110 = 0xe6 // . - opMIRP00111 = 0xe7 // . - opMIRP01000 = 0xe8 // . - opMIRP01001 = 0xe9 // . - opMIRP01010 = 0xea // . - opMIRP01011 = 0xeb // . - opMIRP01100 = 0xec // . - opMIRP01101 = 0xed // . - opMIRP01110 = 0xee // . - opMIRP01111 = 0xef // . - opMIRP10000 = 0xf0 // . - opMIRP10001 = 0xf1 // . - opMIRP10010 = 0xf2 // . - opMIRP10011 = 0xf3 // . - opMIRP10100 = 0xf4 // . - opMIRP10101 = 0xf5 // . - opMIRP10110 = 0xf6 // . - opMIRP10111 = 0xf7 // . - opMIRP11000 = 0xf8 // . - opMIRP11001 = 0xf9 // . - opMIRP11010 = 0xfa // . - opMIRP11011 = 0xfb // . - opMIRP11100 = 0xfc // . - opMIRP11101 = 0xfd // . - opMIRP11110 = 0xfe // . - opMIRP11111 = 0xff // . -) - -// popCount is the number of stack elements that each opcode pops. -var popCount = [256]uint8{ - // 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f - 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, 5, // 0x00 - 0x0f - 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, // 0x10 - 0x1f - 1, 1, 0, 2, 0, 1, 1, 2, 0, 1, 2, 1, 1, 0, 1, 1, // 0x20 - 0x2f - 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f - 0, 0, 2, 1, 2, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 0, // 0x40 - 0x4f - 2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, 1, 1, 1, // 0x50 - 0x5f - 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f - 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, 0, 0, 0, 1, 1, // 0x70 - 0x7f - 0, 2, 2, 0, 0, 1, 2, 2, 1, 1, 3, 2, 2, 1, 2, 0, // 0x80 - 0x8f - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x90 - 0x9f - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xa0 - 0xaf - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0 - 0xbf - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xc0 - 0xcf - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xd0 - 0xdf - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xe0 - 0xef - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xf0 - 0xff -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/truetype.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/truetype.go deleted file mode 100644 index 96ceef547..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/truetype.go +++ /dev/null @@ -1,554 +0,0 @@ -// Copyright 2010 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -// Package truetype provides a parser for the TTF and TTC file formats. -// Those formats are documented at http://developer.apple.com/fonts/TTRefMan/ -// and http://www.microsoft.com/typography/otspec/ -// -// Some of a font's methods provide lengths or co-ordinates, e.g. bounds, font -// metrics and control points. All these methods take a scale parameter, which -// is the number of device units in 1 em. For example, if 1 em is 10 pixels and -// 1 pixel is 64 units, then scale is 640. If the device space involves pixels, -// 64 units per pixel is recommended, since that is what the bytecode hinter -// uses when snapping point co-ordinates to the pixel grid. -// -// To measure a TrueType font in ideal FUnit space, use scale equal to -// font.FUnitsPerEm(). -package truetype - -import ( - "fmt" -) - -// An Index is a Font's index of a rune. -type Index uint16 - -// A Bounds holds the co-ordinate range of one or more glyphs. -// The endpoints are inclusive. -type Bounds struct { - XMin, YMin, XMax, YMax int32 -} - -// An HMetric holds the horizontal metrics of a single glyph. -type HMetric struct { - AdvanceWidth, LeftSideBearing int32 -} - -// A VMetric holds the vertical metrics of a single glyph. -type VMetric struct { - AdvanceHeight, TopSideBearing int32 -} - -// A FormatError reports that the input is not a valid TrueType font. -type FormatError string - -func (e FormatError) Error() string { - return "freetype: invalid TrueType format: " + string(e) -} - -// An UnsupportedError reports that the input uses a valid but unimplemented -// TrueType feature. -type UnsupportedError string - -func (e UnsupportedError) Error() string { - return "freetype: unsupported TrueType feature: " + string(e) -} - -// u32 returns the big-endian uint32 at b[i:]. -func u32(b []byte, i int) uint32 { - return uint32(b[i])<<24 | uint32(b[i+1])<<16 | uint32(b[i+2])<<8 | uint32(b[i+3]) -} - -// u16 returns the big-endian uint16 at b[i:]. -func u16(b []byte, i int) uint16 { - return uint16(b[i])<<8 | uint16(b[i+1]) -} - -// readTable returns a slice of the TTF data given by a table's directory entry. -func readTable(ttf []byte, offsetLength []byte) ([]byte, error) { - offset := int(u32(offsetLength, 0)) - if offset < 0 { - return nil, FormatError(fmt.Sprintf("offset too large: %d", uint32(offset))) - } - length := int(u32(offsetLength, 4)) - if length < 0 { - return nil, FormatError(fmt.Sprintf("length too large: %d", uint32(length))) - } - end := offset + length - if end < 0 || end > len(ttf) { - return nil, FormatError(fmt.Sprintf("offset + length too large: %d", uint32(offset)+uint32(length))) - } - return ttf[offset:end], nil -} - -const ( - locaOffsetFormatUnknown int = iota - locaOffsetFormatShort - locaOffsetFormatLong -) - -// A cm holds a parsed cmap entry. -type cm struct { - start, end, delta, offset uint32 -} - -// A Font represents a Truetype font. -type Font struct { - // Tables sliced from the TTF data. The different tables are documented - // at http://developer.apple.com/fonts/TTRefMan/RM06/Chap6.html - cmap, cvt, fpgm, glyf, hdmx, head, hhea, hmtx, kern, loca, maxp, os2, prep, vmtx []byte - - cmapIndexes []byte - - // Cached values derived from the raw ttf data. - cm []cm - locaOffsetFormat int - nGlyph, nHMetric, nKern int - fUnitsPerEm int32 - bounds Bounds - // Values from the maxp section. - maxTwilightPoints, maxStorage, maxFunctionDefs, maxStackElements uint16 -} - -func (f *Font) parseCmap() error { - const ( - cmapFormat4 = 4 - cmapFormat12 = 12 - languageIndependent = 0 - - // A 32-bit encoding consists of a most-significant 16-bit Platform ID and a - // least-significant 16-bit Platform Specific ID. The magic numbers are - // specified at https://www.microsoft.com/typography/otspec/name.htm - unicodeEncoding = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0) - microsoftSymbolEncoding = 0x00030000 // PID = 3 (Microsoft), PSID = 0 (Symbol) - microsoftUCS2Encoding = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2) - microsoftUCS4Encoding = 0x0003000a // PID = 3 (Microsoft), PSID = 10 (UCS-4) - ) - - if len(f.cmap) < 4 { - return FormatError("cmap too short") - } - nsubtab := int(u16(f.cmap, 2)) - if len(f.cmap) < 8*nsubtab+4 { - return FormatError("cmap too short") - } - offset, found, x := 0, false, 4 - for i := 0; i < nsubtab; i++ { - // We read the 16-bit Platform ID and 16-bit Platform Specific ID as a single uint32. - // All values are big-endian. - pidPsid, o := u32(f.cmap, x), u32(f.cmap, x+4) - x += 8 - // We prefer the Unicode cmap encoding. Failing to find that, we fall - // back onto the Microsoft cmap encoding. - if pidPsid == unicodeEncoding { - offset, found = int(o), true - break - - } else if pidPsid == microsoftSymbolEncoding || - pidPsid == microsoftUCS2Encoding || - pidPsid == microsoftUCS4Encoding { - - offset, found = int(o), true - // We don't break out of the for loop, so that Unicode can override Microsoft. - } - } - if !found { - return UnsupportedError("cmap encoding") - } - if offset <= 0 || offset > len(f.cmap) { - return FormatError("bad cmap offset") - } - - cmapFormat := u16(f.cmap, offset) - switch cmapFormat { - case cmapFormat4: - language := u16(f.cmap, offset+4) - if language != languageIndependent { - return UnsupportedError(fmt.Sprintf("language: %d", language)) - } - segCountX2 := int(u16(f.cmap, offset+6)) - if segCountX2%2 == 1 { - return FormatError(fmt.Sprintf("bad segCountX2: %d", segCountX2)) - } - segCount := segCountX2 / 2 - offset += 14 - f.cm = make([]cm, segCount) - for i := 0; i < segCount; i++ { - f.cm[i].end = uint32(u16(f.cmap, offset)) - offset += 2 - } - offset += 2 - for i := 0; i < segCount; i++ { - f.cm[i].start = uint32(u16(f.cmap, offset)) - offset += 2 - } - for i := 0; i < segCount; i++ { - f.cm[i].delta = uint32(u16(f.cmap, offset)) - offset += 2 - } - for i := 0; i < segCount; i++ { - f.cm[i].offset = uint32(u16(f.cmap, offset)) - offset += 2 - } - f.cmapIndexes = f.cmap[offset:] - return nil - - case cmapFormat12: - if u16(f.cmap, offset+2) != 0 { - return FormatError(fmt.Sprintf("cmap format: % x", f.cmap[offset:offset+4])) - } - length := u32(f.cmap, offset+4) - language := u32(f.cmap, offset+8) - if language != languageIndependent { - return UnsupportedError(fmt.Sprintf("language: %d", language)) - } - nGroups := u32(f.cmap, offset+12) - if length != 12*nGroups+16 { - return FormatError("inconsistent cmap length") - } - offset += 16 - f.cm = make([]cm, nGroups) - for i := uint32(0); i < nGroups; i++ { - f.cm[i].start = u32(f.cmap, offset+0) - f.cm[i].end = u32(f.cmap, offset+4) - f.cm[i].delta = u32(f.cmap, offset+8) - f.cm[i].start - offset += 12 - } - return nil - } - return UnsupportedError(fmt.Sprintf("cmap format: %d", cmapFormat)) -} - -func (f *Font) parseHead() error { - if len(f.head) != 54 { - return FormatError(fmt.Sprintf("bad head length: %d", len(f.head))) - } - f.fUnitsPerEm = int32(u16(f.head, 18)) - f.bounds.XMin = int32(int16(u16(f.head, 36))) - f.bounds.YMin = int32(int16(u16(f.head, 38))) - f.bounds.XMax = int32(int16(u16(f.head, 40))) - f.bounds.YMax = int32(int16(u16(f.head, 42))) - switch i := u16(f.head, 50); i { - case 0: - f.locaOffsetFormat = locaOffsetFormatShort - case 1: - f.locaOffsetFormat = locaOffsetFormatLong - default: - return FormatError(fmt.Sprintf("bad indexToLocFormat: %d", i)) - } - return nil -} - -func (f *Font) parseHhea() error { - if len(f.hhea) != 36 { - return FormatError(fmt.Sprintf("bad hhea length: %d", len(f.hhea))) - } - f.nHMetric = int(u16(f.hhea, 34)) - if 4*f.nHMetric+2*(f.nGlyph-f.nHMetric) != len(f.hmtx) { - return FormatError(fmt.Sprintf("bad hmtx length: %d", len(f.hmtx))) - } - return nil -} - -func (f *Font) parseKern() error { - // Apple's TrueType documentation (http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html) says: - // "Previous versions of the 'kern' table defined both the version and nTables fields in the header - // as UInt16 values and not UInt32 values. Use of the older format on the Mac OS is discouraged - // (although AAT can sense an old kerning table and still make correct use of it). Microsoft - // Windows still uses the older format for the 'kern' table and will not recognize the newer one. - // Fonts targeted for the Mac OS only should use the new format; fonts targeted for both the Mac OS - // and Windows should use the old format." - // Since we expect that almost all fonts aim to be Windows-compatible, we only parse the "older" format, - // just like the C Freetype implementation. - if len(f.kern) == 0 { - if f.nKern != 0 { - return FormatError("bad kern table length") - } - return nil - } - if len(f.kern) < 18 { - return FormatError("kern data too short") - } - version, offset := u16(f.kern, 0), 2 - if version != 0 { - return UnsupportedError(fmt.Sprintf("kern version: %d", version)) - } - n, offset := u16(f.kern, offset), offset+2 - if n != 1 { - return UnsupportedError(fmt.Sprintf("kern nTables: %d", n)) - } - offset += 2 - length, offset := int(u16(f.kern, offset)), offset+2 - coverage, offset := u16(f.kern, offset), offset+2 - if coverage != 0x0001 { - // We only support horizontal kerning. - return UnsupportedError(fmt.Sprintf("kern coverage: 0x%04x", coverage)) - } - f.nKern, offset = int(u16(f.kern, offset)), offset+2 - if 6*f.nKern != length-14 { - return FormatError("bad kern table length") - } - return nil -} - -func (f *Font) parseMaxp() error { - if len(f.maxp) != 32 { - return FormatError(fmt.Sprintf("bad maxp length: %d", len(f.maxp))) - } - f.nGlyph = int(u16(f.maxp, 4)) - f.maxTwilightPoints = u16(f.maxp, 16) - f.maxStorage = u16(f.maxp, 18) - f.maxFunctionDefs = u16(f.maxp, 20) - f.maxStackElements = u16(f.maxp, 24) - return nil -} - -// scale returns x divided by f.fUnitsPerEm, rounded to the nearest integer. -func (f *Font) scale(x int32) int32 { - if x >= 0 { - x += f.fUnitsPerEm / 2 - } else { - x -= f.fUnitsPerEm / 2 - } - return x / f.fUnitsPerEm -} - -// Bounds returns the union of a Font's glyphs' bounds. -func (f *Font) Bounds(scale int32) Bounds { - b := f.bounds - b.XMin = f.scale(scale * b.XMin) - b.YMin = f.scale(scale * b.YMin) - b.XMax = f.scale(scale * b.XMax) - b.YMax = f.scale(scale * b.YMax) - return b -} - -// FUnitsPerEm returns the number of FUnits in a Font's em-square's side. -func (f *Font) FUnitsPerEm() int32 { - return f.fUnitsPerEm -} - -// Index returns a Font's index for the given rune. -func (f *Font) Index(x rune) Index { - c := uint32(x) - for i, j := 0, len(f.cm); i < j; { - h := i + (j-i)/2 - cm := &f.cm[h] - if c < cm.start { - j = h - } else if cm.end < c { - i = h + 1 - } else if cm.offset == 0 { - return Index(c + cm.delta) - } else { - offset := int(cm.offset) + 2*(h-len(f.cm)+int(c-cm.start)) - return Index(u16(f.cmapIndexes, offset)) - } - } - return 0 -} - -// unscaledHMetric returns the unscaled horizontal metrics for the glyph with -// the given index. -func (f *Font) unscaledHMetric(i Index) (h HMetric) { - j := int(i) - if j < 0 || f.nGlyph <= j { - return HMetric{} - } - if j >= f.nHMetric { - p := 4 * (f.nHMetric - 1) - return HMetric{ - AdvanceWidth: int32(u16(f.hmtx, p)), - LeftSideBearing: int32(int16(u16(f.hmtx, p+2*(j-f.nHMetric)+4))), - } - } - return HMetric{ - AdvanceWidth: int32(u16(f.hmtx, 4*j)), - LeftSideBearing: int32(int16(u16(f.hmtx, 4*j+2))), - } -} - -// HMetric returns the horizontal metrics for the glyph with the given index. -func (f *Font) HMetric(scale int32, i Index) HMetric { - h := f.unscaledHMetric(i) - h.AdvanceWidth = f.scale(scale * h.AdvanceWidth) - h.LeftSideBearing = f.scale(scale * h.LeftSideBearing) - return h -} - -// unscaledVMetric returns the unscaled vertical metrics for the glyph with -// the given index. yMax is the top of the glyph's bounding box. -func (f *Font) unscaledVMetric(i Index, yMax int32) (v VMetric) { - j := int(i) - if j < 0 || f.nGlyph <= j { - return VMetric{} - } - if 4*j+4 <= len(f.vmtx) { - return VMetric{ - AdvanceHeight: int32(u16(f.vmtx, 4*j)), - TopSideBearing: int32(int16(u16(f.vmtx, 4*j+2))), - } - } - // The OS/2 table has grown over time. - // https://developer.apple.com/fonts/TTRefMan/RM06/Chap6OS2.html - // says that it was originally 68 bytes. Optional fields, including - // the ascender and descender, are described at - // http://www.microsoft.com/typography/otspec/os2.htm - if len(f.os2) >= 72 { - sTypoAscender := int32(int16(u16(f.os2, 68))) - sTypoDescender := int32(int16(u16(f.os2, 70))) - return VMetric{ - AdvanceHeight: sTypoAscender - sTypoDescender, - TopSideBearing: sTypoAscender - yMax, - } - } - return VMetric{ - AdvanceHeight: f.fUnitsPerEm, - TopSideBearing: 0, - } -} - -// VMetric returns the vertical metrics for the glyph with the given index. -func (f *Font) VMetric(scale int32, i Index) VMetric { - // TODO: should 0 be bounds.YMax? - v := f.unscaledVMetric(i, 0) - v.AdvanceHeight = f.scale(scale * v.AdvanceHeight) - v.TopSideBearing = f.scale(scale * v.TopSideBearing) - return v -} - -// Kerning returns the kerning for the given glyph pair. -func (f *Font) Kerning(scale int32, i0, i1 Index) int32 { - if f.nKern == 0 { - return 0 - } - g := uint32(i0)<<16 | uint32(i1) - lo, hi := 0, f.nKern - for lo < hi { - i := (lo + hi) / 2 - ig := u32(f.kern, 18+6*i) - if ig < g { - lo = i + 1 - } else if ig > g { - hi = i - } else { - return f.scale(scale * int32(int16(u16(f.kern, 22+6*i)))) - } - } - return 0 -} - -// Parse returns a new Font for the given TTF or TTC data. -// -// For TrueType Collections, the first font in the collection is parsed. -func Parse(ttf []byte) (font *Font, err error) { - return parse(ttf, 0) -} - -func parse(ttf []byte, offset int) (font *Font, err error) { - if len(ttf)-offset < 12 { - err = FormatError("TTF data is too short") - return - } - originalOffset := offset - magic, offset := u32(ttf, offset), offset+4 - switch magic { - case 0x00010000: - // No-op. - case 0x74746366: // "ttcf" as a big-endian uint32. - if originalOffset != 0 { - err = FormatError("recursive TTC") - return - } - ttcVersion, offset := u32(ttf, offset), offset+4 - if ttcVersion != 0x00010000 { - // TODO: support TTC version 2.0, once I have such a .ttc file to test with. - err = FormatError("bad TTC version") - return - } - numFonts, offset := int(u32(ttf, offset)), offset+4 - if numFonts <= 0 { - err = FormatError("bad number of TTC fonts") - return - } - if len(ttf[offset:])/4 < numFonts { - err = FormatError("TTC offset table is too short") - return - } - // TODO: provide an API to select which font in a TrueType collection to return, - // not just the first one. This may require an API to parse a TTC's name tables, - // so users of this package can select the font in a TTC by name. - offset = int(u32(ttf, offset)) - if offset <= 0 || offset > len(ttf) { - err = FormatError("bad TTC offset") - return - } - return parse(ttf, offset) - default: - err = FormatError("bad TTF version") - return - } - n, offset := int(u16(ttf, offset)), offset+2 - if len(ttf) < 16*n+12 { - err = FormatError("TTF data is too short") - return - } - f := new(Font) - // Assign the table slices. - for i := 0; i < n; i++ { - x := 16*i + 12 - switch string(ttf[x : x+4]) { - case "cmap": - f.cmap, err = readTable(ttf, ttf[x+8:x+16]) - case "cvt ": - f.cvt, err = readTable(ttf, ttf[x+8:x+16]) - case "fpgm": - f.fpgm, err = readTable(ttf, ttf[x+8:x+16]) - case "glyf": - f.glyf, err = readTable(ttf, ttf[x+8:x+16]) - case "hdmx": - f.hdmx, err = readTable(ttf, ttf[x+8:x+16]) - case "head": - f.head, err = readTable(ttf, ttf[x+8:x+16]) - case "hhea": - f.hhea, err = readTable(ttf, ttf[x+8:x+16]) - case "hmtx": - f.hmtx, err = readTable(ttf, ttf[x+8:x+16]) - case "kern": - f.kern, err = readTable(ttf, ttf[x+8:x+16]) - case "loca": - f.loca, err = readTable(ttf, ttf[x+8:x+16]) - case "maxp": - f.maxp, err = readTable(ttf, ttf[x+8:x+16]) - case "OS/2": - f.os2, err = readTable(ttf, ttf[x+8:x+16]) - case "prep": - f.prep, err = readTable(ttf, ttf[x+8:x+16]) - case "vmtx": - f.vmtx, err = readTable(ttf, ttf[x+8:x+16]) - } - if err != nil { - return - } - } - // Parse and sanity-check the TTF data. - if err = f.parseHead(); err != nil { - return - } - if err = f.parseMaxp(); err != nil { - return - } - if err = f.parseCmap(); err != nil { - return - } - if err = f.parseKern(); err != nil { - return - } - if err = f.parseHhea(); err != nil { - return - } - font = f - return -} diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/truetype_test.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/truetype_test.go deleted file mode 100644 index 9ef6ec8d2..000000000 --- a/Godeps/_workspace/src/code.google.com/p/freetype-go/freetype/truetype/truetype_test.go +++ /dev/null @@ -1,366 +0,0 @@ -// Copyright 2012 The Freetype-Go Authors. All rights reserved. -// Use of this source code is governed by your choice of either the -// FreeType License or the GNU General Public License version 2 (or -// any later version), both of which can be found in the LICENSE file. - -package truetype - -import ( - "bufio" - "fmt" - "io" - "io/ioutil" - "os" - "strconv" - "strings" - "testing" -) - -func parseTestdataFont(name string) (font *Font, testdataIsOptional bool, err error) { - b, err := ioutil.ReadFile(fmt.Sprintf("../../testdata/%s.ttf", name)) - if err != nil { - // The "x-foo" fonts are optional tests, as they are not checked - // in for copyright or file size reasons. - return nil, strings.HasPrefix(name, "x-"), fmt.Errorf("%s: ReadFile: %v", name, err) - } - font, err = Parse(b) - if err != nil { - return nil, true, fmt.Errorf("%s: Parse: %v", name, err) - } - return font, false, nil -} - -// TestParse tests that the luxisr.ttf metrics and glyphs are parsed correctly. -// The numerical values can be manually verified by examining luxisr.ttx. -func TestParse(t *testing.T) { - font, _, err := parseTestdataFont("luxisr") - if err != nil { - t.Fatal(err) - } - if got, want := font.FUnitsPerEm(), int32(2048); got != want { - t.Errorf("FUnitsPerEm: got %v, want %v", got, want) - } - fupe := font.FUnitsPerEm() - if got, want := font.Bounds(fupe), (Bounds{-441, -432, 2024, 2033}); got != want { - t.Errorf("Bounds: got %v, want %v", got, want) - } - - i0 := font.Index('A') - i1 := font.Index('V') - if i0 != 36 || i1 != 57 { - t.Fatalf("Index: i0, i1 = %d, %d, want 36, 57", i0, i1) - } - if got, want := font.HMetric(fupe, i0), (HMetric{1366, 19}); got != want { - t.Errorf("HMetric: got %v, want %v", got, want) - } - if got, want := font.VMetric(fupe, i0), (VMetric{2465, 553}); got != want { - t.Errorf("VMetric: got %v, want %v", got, want) - } - if got, want := font.Kerning(fupe, i0, i1), int32(-144); got != want { - t.Errorf("Kerning: got %v, want %v", got, want) - } - - g := NewGlyphBuf() - err = g.Load(font, fupe, i0, NoHinting) - if err != nil { - t.Fatalf("Load: %v", err) - } - g0 := &GlyphBuf{ - B: g.B, - Point: g.Point, - End: g.End, - } - g1 := &GlyphBuf{ - B: Bounds{19, 0, 1342, 1480}, - Point: []Point{ - {19, 0, 51}, - {581, 1480, 1}, - {789, 1480, 51}, - {1342, 0, 1}, - {1116, 0, 35}, - {962, 410, 3}, - {368, 410, 33}, - {214, 0, 3}, - {428, 566, 19}, - {904, 566, 33}, - {667, 1200, 3}, - }, - End: []int{8, 11}, - } - if got, want := fmt.Sprint(g0), fmt.Sprint(g1); got != want { - t.Errorf("GlyphBuf:\ngot %v\nwant %v", got, want) - } -} - -func TestIndex(t *testing.T) { - testCases := map[string]map[rune]Index{ - "luxisr": { - ' ': 3, - '!': 4, - 'A': 36, - 'V': 57, - 'É': 101, - 'fl': 193, - '\u22c5': 385, - '中': 0, - }, - - // The x-etc test cases use those versions of the .ttf files provided - // by Ubuntu 14.04. See testdata/make-other-hinting-txts.sh for details. - - "x-arial-bold": { - ' ': 3, - '+': 14, - '0': 19, - '_': 66, - 'w': 90, - '~': 97, - 'Ä': 98, - 'fl': 192, - '½': 242, - 'σ': 305, - 'λ': 540, - 'ỹ': 1275, - '\u04e9': 1319, - '中': 0, - }, - "x-deja-vu-sans-oblique": { - ' ': 3, - '*': 13, - 'Œ': 276, - 'ω': 861, - '‡': 2571, - '⊕': 3110, - 'fl': 4728, - '\ufb03': 4729, - '\ufffd': 4813, - // TODO: '\U0001f640': ???, - '中': 0, - }, - "x-droid-sans-japanese": { - ' ': 0, - '\u3000': 3, - '\u3041': 25, - '\u30fe': 201, - '\uff61': 202, - '\uff67': 208, - '\uff9e': 263, - '\uff9f': 264, - '\u4e00': 265, - '\u557e': 1000, - '\u61b6': 2024, - '\u6ede': 3177, - '\u7505': 3555, - '\u81e3': 4602, - '\u81e5': 4603, - '\u81e7': 4604, - '\u81e8': 4605, - '\u81ea': 4606, - '\u81ed': 4607, - '\u81f3': 4608, - '\u81f4': 4609, - '\u91c7': 5796, - '\u9fa0': 6620, - '\u203e': 12584, - }, - "x-times-new-roman": { - ' ': 3, - ':': 29, - 'fl': 192, - 'Ŀ': 273, - '♠': 388, - 'Ŗ': 451, - 'Σ': 520, - '\u200D': 745, - 'Ẽ': 1216, - '\u04e9': 1319, - '中': 0, - }, - } - for name, wants := range testCases { - font, testdataIsOptional, err := parseTestdataFont(name) - if err != nil { - if testdataIsOptional { - t.Log(err) - } else { - t.Fatal(err) - } - continue - } - for r, want := range wants { - if got := font.Index(r); got != want { - t.Errorf("%s: Index of %q, aka %U: got %d, want %d", name, r, r, got, want) - } - } - } -} - -type scalingTestData struct { - advanceWidth int32 - bounds Bounds - points []Point -} - -// scalingTestParse parses a line of points like -// 213 -22 -111 236 555;-22 -111 1, 178 555 1, 236 555 1, 36 -111 1 -// The line will not have a trailing "\n". -func scalingTestParse(line string) (ret scalingTestData) { - next := func(s string) (string, int32) { - t, i := "", strings.Index(s, " ") - if i != -1 { - s, t = s[:i], s[i+1:] - } - x, _ := strconv.Atoi(s) - return t, int32(x) - } - - i := strings.Index(line, ";") - prefix, line := line[:i], line[i+1:] - - prefix, ret.advanceWidth = next(prefix) - prefix, ret.bounds.XMin = next(prefix) - prefix, ret.bounds.YMin = next(prefix) - prefix, ret.bounds.XMax = next(prefix) - prefix, ret.bounds.YMax = next(prefix) - - ret.points = make([]Point, 0, 1+strings.Count(line, ",")) - for len(line) > 0 { - s := line - if i := strings.Index(line, ","); i != -1 { - s, line = line[:i], line[i+1:] - for len(line) > 0 && line[0] == ' ' { - line = line[1:] - } - } else { - line = "" - } - s, x := next(s) - s, y := next(s) - s, f := next(s) - ret.points = append(ret.points, Point{X: x, Y: y, Flags: uint32(f)}) - } - return ret -} - -// scalingTestEquals is equivalent to, but faster than, calling -// reflect.DeepEquals(a, b), and also returns the index of the first non-equal -// element. It also treats a nil []Point and an empty non-nil []Point as equal. -// a and b must have equal length. -func scalingTestEquals(a, b []Point) (index int, equals bool) { - for i, p := range a { - if p != b[i] { - return i, false - } - } - return 0, true -} - -var scalingTestCases = []struct { - name string - size int32 -}{ - {"luxisr", 12}, - {"x-arial-bold", 11}, - {"x-deja-vu-sans-oblique", 17}, - {"x-droid-sans-japanese", 9}, - {"x-times-new-roman", 13}, -} - -func testScaling(t *testing.T, h Hinting) { - for _, tc := range scalingTestCases { - font, testdataIsOptional, err := parseTestdataFont(tc.name) - if err != nil { - if testdataIsOptional { - t.Log(err) - } else { - t.Error(err) - } - continue - } - hintingStr := "sans" - if h != NoHinting { - hintingStr = "with" - } - f, err := os.Open(fmt.Sprintf( - "../../testdata/%s-%dpt-%s-hinting.txt", tc.name, tc.size, hintingStr)) - if err != nil { - t.Errorf("%s: Open: %v", tc.name, err) - continue - } - defer f.Close() - - wants := []scalingTestData{} - scanner := bufio.NewScanner(f) - if scanner.Scan() { - major, minor, patch := 0, 0, 0 - _, err := fmt.Sscanf(scanner.Text(), "freetype version %d.%d.%d", &major, &minor, &patch) - if err != nil { - t.Errorf("%s: version information: %v", tc.name, err) - } - if (major < 2) || (major == 2 && minor < 5) || (major == 2 && minor == 5 && patch < 1) { - t.Errorf("%s: need freetype version >= 2.5.1.\n"+ - "Try setting LD_LIBRARY_PATH=/path/to/freetype_built_from_src/objs/.libs/\n"+ - "and re-running testdata/make-other-hinting-txts.sh", - tc.name) - continue - } - } else { - t.Errorf("%s: no version information", tc.name) - continue - } - for scanner.Scan() { - wants = append(wants, scalingTestParse(scanner.Text())) - } - if err := scanner.Err(); err != nil && err != io.EOF { - t.Errorf("%s: Scanner: %v", tc.name, err) - continue - } - - glyphBuf := NewGlyphBuf() - for i, want := range wants { - if err = glyphBuf.Load(font, tc.size*64, Index(i), h); err != nil { - t.Errorf("%s: glyph #%d: Load: %v", tc.name, i, err) - continue - } - got := scalingTestData{ - advanceWidth: glyphBuf.AdvanceWidth, - bounds: glyphBuf.B, - points: glyphBuf.Point, - } - - if got.advanceWidth != want.advanceWidth { - t.Errorf("%s: glyph #%d advance width:\ngot %v\nwant %v", - tc.name, i, got.advanceWidth, want.advanceWidth) - continue - } - - if got.bounds != want.bounds { - t.Errorf("%s: glyph #%d bounds:\ngot %v\nwant %v", - tc.name, i, got.bounds, want.bounds) - continue - } - - for i := range got.points { - got.points[i].Flags &= 0x01 - } - if len(got.points) != len(want.points) { - t.Errorf("%s: glyph #%d:\ngot %v\nwant %v\ndifferent slice lengths: %d versus %d", - tc.name, i, got.points, want.points, len(got.points), len(want.points)) - continue - } - if j, equals := scalingTestEquals(got.points, want.points); !equals { - t.Errorf("%s: glyph #%d:\ngot %v\nwant %v\nat index %d: %v versus %v", - tc.name, i, got.points, want.points, j, got.points[j], want.points[j]) - continue - } - } - } -} - -func TestScalingSansHinting(t *testing.T) { - testScaling(t, NoHinting) -} - -func TestScalingWithHinting(t *testing.T) { - testScaling(t, FullHinting) -} |