diff options
Diffstat (limited to 'Godeps/_workspace/src/code.google.com/p/freetype-go/example/raster')
-rw-r--r-- | Godeps/_workspace/src/code.google.com/p/freetype-go/example/raster/main.go | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/example/raster/main.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/example/raster/main.go new file mode 100644 index 000000000..5e6c9815d --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/freetype-go/example/raster/main.go @@ -0,0 +1,178 @@ +// 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 main + +import ( + "bufio" + "fmt" + "image" + "image/color" + "image/draw" + "image/png" + "log" + "os" + + "code.google.com/p/freetype-go/freetype/raster" +) + +type node struct { + x, y, degree int +} + +// These contours "outside" and "inside" are from the `A' glyph from the Droid +// Serif Regular font. + +var outside = []node{ + node{414, 489, 1}, + node{336, 274, 2}, + node{327, 250, 0}, + node{322, 226, 2}, + node{317, 203, 0}, + node{317, 186, 2}, + node{317, 134, 0}, + node{350, 110, 2}, + node{384, 86, 0}, + node{453, 86, 1}, + node{500, 86, 1}, + node{500, 0, 1}, + node{0, 0, 1}, + node{0, 86, 1}, + node{39, 86, 2}, + node{69, 86, 0}, + node{90, 92, 2}, + node{111, 99, 0}, + node{128, 117, 2}, + node{145, 135, 0}, + node{160, 166, 2}, + node{176, 197, 0}, + node{195, 246, 1}, + node{649, 1462, 1}, + node{809, 1462, 1}, + node{1272, 195, 2}, + node{1284, 163, 0}, + node{1296, 142, 2}, + node{1309, 121, 0}, + node{1326, 108, 2}, + node{1343, 96, 0}, + node{1365, 91, 2}, + node{1387, 86, 0}, + node{1417, 86, 1}, + node{1444, 86, 1}, + node{1444, 0, 1}, + node{881, 0, 1}, + node{881, 86, 1}, + node{928, 86, 2}, + node{1051, 86, 0}, + node{1051, 184, 2}, + node{1051, 201, 0}, + node{1046, 219, 2}, + node{1042, 237, 0}, + node{1034, 260, 1}, + node{952, 489, 1}, + node{414, 489, -1}, +} + +var inside = []node{ + node{686, 1274, 1}, + node{453, 592, 1}, + node{915, 592, 1}, + node{686, 1274, -1}, +} + +func p(n node) raster.Point { + x, y := 20+n.x/4, 380-n.y/4 + return raster.Point{ + X: raster.Fix32(x * 256), + Y: raster.Fix32(y * 256), + } +} + +func contour(r *raster.Rasterizer, ns []node) { + if len(ns) == 0 { + return + } + i := 0 + r.Start(p(ns[i])) + for { + switch ns[i].degree { + case -1: + // -1 signifies end-of-contour. + return + case 1: + i += 1 + r.Add1(p(ns[i])) + case 2: + i += 2 + r.Add2(p(ns[i-1]), p(ns[i])) + default: + panic("bad degree") + } + } +} + +func showNodes(m *image.RGBA, ns []node) { + for _, n := range ns { + p := p(n) + x, y := int(p.X)/256, int(p.Y)/256 + if !(image.Point{x, y}).In(m.Bounds()) { + continue + } + var c color.Color + switch n.degree { + case 0: + c = color.RGBA{0, 255, 255, 255} + case 1: + c = color.RGBA{255, 0, 0, 255} + case 2: + c = color.RGBA{255, 0, 0, 255} + } + if c != nil { + m.Set(x, y, c) + } + } +} + +func main() { + // Rasterize the contours to a mask image. + const ( + w = 400 + h = 400 + ) + r := raster.NewRasterizer(w, h) + contour(r, outside) + contour(r, inside) + mask := image.NewAlpha(image.Rect(0, 0, w, h)) + p := raster.NewAlphaSrcPainter(mask) + r.Rasterize(p) + + // Draw the mask image (in gray) onto an RGBA image. + rgba := image.NewRGBA(image.Rect(0, 0, w, h)) + gray := image.NewUniform(color.Alpha{0x1f}) + draw.Draw(rgba, rgba.Bounds(), image.Black, image.ZP, draw.Src) + draw.DrawMask(rgba, rgba.Bounds(), gray, image.ZP, mask, image.ZP, draw.Over) + showNodes(rgba, outside) + showNodes(rgba, inside) + + // Save that RGBA image to disk. + f, err := os.Create("out.png") + if err != nil { + log.Println(err) + os.Exit(1) + } + defer f.Close() + b := bufio.NewWriter(f) + err = png.Encode(b, rgba) + if err != nil { + log.Println(err) + os.Exit(1) + } + err = b.Flush() + if err != nil { + log.Println(err) + os.Exit(1) + } + fmt.Println("Wrote out.png OK.") +} |