diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/pic.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/pic.go | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/pic.go b/Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/pic.go new file mode 100644 index 000000000..6baef94d2 --- /dev/null +++ b/Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/pic.go @@ -0,0 +1,506 @@ +package web + +import ( + "bytes" + "fmt" + "image" + "image/color" + "image/draw" + "image/png" + "net/http" + "strconv" + "strings" + + "code.google.com/p/freetype-go/freetype" + "github.com/mattermost/rsc/appfs/fs" + "github.com/mattermost/rsc/qr" + "github.com/mattermost/rsc/qr/coding" +) + +func makeImage(req *http.Request, caption, font string, pt, size, border, scale int, f func(x, y int) uint32) *image.RGBA { + d := (size + 2*border) * scale + csize := 0 + if caption != "" { + if pt == 0 { + pt = 11 + } + csize = pt * 2 + } + c := image.NewRGBA(image.Rect(0, 0, d, d+csize)) + + // white + u := &image.Uniform{C: color.White} + draw.Draw(c, c.Bounds(), u, image.ZP, draw.Src) + + for y := 0; y < size; y++ { + for x := 0; x < size; x++ { + r := image.Rect((x+border)*scale, (y+border)*scale, (x+border+1)*scale, (y+border+1)*scale) + rgba := f(x, y) + u.C = color.RGBA{byte(rgba >> 24), byte(rgba >> 16), byte(rgba >> 8), byte(rgba)} + draw.Draw(c, r, u, image.ZP, draw.Src) + } + } + + if csize != 0 { + if font == "" { + font = "data/luxisr.ttf" + } + ctxt := fs.NewContext(req) + dat, _, err := ctxt.Read(font) + if err != nil { + panic(err) + } + tfont, err := freetype.ParseFont(dat) + if err != nil { + panic(err) + } + ft := freetype.NewContext() + ft.SetDst(c) + ft.SetDPI(100) + ft.SetFont(tfont) + ft.SetFontSize(float64(pt)) + ft.SetSrc(image.NewUniform(color.Black)) + ft.SetClip(image.Rect(0, 0, 0, 0)) + wid, err := ft.DrawString(caption, freetype.Pt(0, 0)) + if err != nil { + panic(err) + } + p := freetype.Pt(d, d+3*pt/2) + p.X -= wid.X + p.X /= 2 + ft.SetClip(c.Bounds()) + ft.DrawString(caption, p) + } + + return c +} + +func makeFrame(req *http.Request, font string, pt, vers, l, scale, dots int) image.Image { + lev := coding.Level(l) + p, err := coding.NewPlan(coding.Version(vers), lev, 0) + if err != nil { + panic(err) + } + + nd := p.DataBytes / p.Blocks + nc := p.CheckBytes / p.Blocks + extra := p.DataBytes - nd*p.Blocks + + cap := fmt.Sprintf("QR v%d, %s", vers, lev) + if dots > 0 { + cap = fmt.Sprintf("QR v%d order, from bottom right", vers) + } + m := makeImage(req, cap, font, pt, len(p.Pixel), 0, scale, func(x, y int) uint32 { + pix := p.Pixel[y][x] + switch pix.Role() { + case coding.Data: + if dots > 0 { + return 0xffffffff + } + off := int(pix.Offset() / 8) + nd := nd + var i int + for i = 0; i < p.Blocks; i++ { + if i == extra { + nd++ + } + if off < nd { + break + } + off -= nd + } + return blockColors[i%len(blockColors)] + case coding.Check: + if dots > 0 { + return 0xffffffff + } + i := (int(pix.Offset()/8) - p.DataBytes) / nc + return dark(blockColors[i%len(blockColors)]) + } + if pix&coding.Black != 0 { + return 0x000000ff + } + return 0xffffffff + }) + + if dots > 0 { + b := m.Bounds() + for y := 0; y <= len(p.Pixel); y++ { + for x := 0; x < b.Dx(); x++ { + m.SetRGBA(x, y*scale-(y/len(p.Pixel)), color.RGBA{127, 127, 127, 255}) + } + } + for x := 0; x <= len(p.Pixel); x++ { + for y := 0; y < b.Dx(); y++ { + m.SetRGBA(x*scale-(x/len(p.Pixel)), y, color.RGBA{127, 127, 127, 255}) + } + } + order := make([]image.Point, (p.DataBytes+p.CheckBytes)*8+1) + for y, row := range p.Pixel { + for x, pix := range row { + if r := pix.Role(); r != coding.Data && r != coding.Check { + continue + } + // draw.Draw(m, m.Bounds().Add(image.Pt(x*scale, y*scale)), dot, image.ZP, draw.Over) + order[pix.Offset()] = image.Point{x*scale + scale/2, y*scale + scale/2} + } + } + + for mode := 0; mode < 2; mode++ { + for i, p := range order { + q := order[i+1] + if q.X == 0 { + break + } + line(m, p, q, mode) + } + } + } + return m +} + +func line(m *image.RGBA, p, q image.Point, mode int) { + x := 0 + y := 0 + dx := q.X - p.X + dy := q.Y - p.Y + xsign := +1 + ysign := +1 + if dx < 0 { + xsign = -1 + dx = -dx + } + if dy < 0 { + ysign = -1 + dy = -dy + } + pt := func() { + switch mode { + case 0: + for dx := -2; dx <= 2; dx++ { + for dy := -2; dy <= 2; dy++ { + if dy*dx <= -4 || dy*dx >= 4 { + continue + } + m.SetRGBA(p.X+x*xsign+dx, p.Y+y*ysign+dy, color.RGBA{255, 192, 192, 255}) + } + } + + case 1: + m.SetRGBA(p.X+x*xsign, p.Y+y*ysign, color.RGBA{128, 0, 0, 255}) + } + } + if dx > dy { + for x < dx || y < dy { + pt() + x++ + if float64(x)*float64(dy)/float64(dx)-float64(y) > 0.5 { + y++ + } + } + } else { + for x < dx || y < dy { + pt() + y++ + if float64(y)*float64(dx)/float64(dy)-float64(x) > 0.5 { + x++ + } + } + } + pt() +} + +func pngEncode(c image.Image) []byte { + var b bytes.Buffer + png.Encode(&b, c) + return b.Bytes() +} + +// Frame handles a request for a single QR frame. +func Frame(w http.ResponseWriter, req *http.Request) { + arg := func(s string) int { x, _ := strconv.Atoi(req.FormValue(s)); return x } + v := arg("v") + scale := arg("scale") + if scale == 0 { + scale = 8 + } + + w.Header().Set("Cache-Control", "public, max-age=3600") + w.Write(pngEncode(makeFrame(req, req.FormValue("font"), arg("pt"), v, arg("l"), scale, arg("dots")))) +} + +// Frames handles a request for multiple QR frames. +func Frames(w http.ResponseWriter, req *http.Request) { + vs := strings.Split(req.FormValue("v"), ",") + + arg := func(s string) int { x, _ := strconv.Atoi(req.FormValue(s)); return x } + scale := arg("scale") + if scale == 0 { + scale = 8 + } + font := req.FormValue("font") + pt := arg("pt") + dots := arg("dots") + + var images []image.Image + l := arg("l") + for _, v := range vs { + l := l + if i := strings.Index(v, "."); i >= 0 { + l, _ = strconv.Atoi(v[i+1:]) + v = v[:i] + } + vv, _ := strconv.Atoi(v) + images = append(images, makeFrame(req, font, pt, vv, l, scale, dots)) + } + + b := images[len(images)-1].Bounds() + + dx := arg("dx") + if dx == 0 { + dx = b.Dx() + } + x, y := 0, 0 + xmax := 0 + sep := arg("sep") + if sep == 0 { + sep = 10 + } + var points []image.Point + for i, m := range images { + if x > 0 { + x += sep + } + if x > 0 && x+m.Bounds().Dx() > dx { + y += sep + images[i-1].Bounds().Dy() + x = 0 + } + points = append(points, image.Point{x, y}) + x += m.Bounds().Dx() + if x > xmax { + xmax = x + } + + } + + c := image.NewRGBA(image.Rect(0, 0, xmax, y+b.Dy())) + for i, m := range images { + draw.Draw(c, c.Bounds().Add(points[i]), m, image.ZP, draw.Src) + } + + w.Header().Set("Cache-Control", "public, max-age=3600") + w.Write(pngEncode(c)) +} + +// Mask handles a request for a single QR mask. +func Mask(w http.ResponseWriter, req *http.Request) { + arg := func(s string) int { x, _ := strconv.Atoi(req.FormValue(s)); return x } + v := arg("v") + m := arg("m") + scale := arg("scale") + if scale == 0 { + scale = 8 + } + + w.Header().Set("Cache-Control", "public, max-age=3600") + w.Write(pngEncode(makeMask(req, req.FormValue("font"), arg("pt"), v, m, scale))) +} + +// Masks handles a request for multiple QR masks. +func Masks(w http.ResponseWriter, req *http.Request) { + arg := func(s string) int { x, _ := strconv.Atoi(req.FormValue(s)); return x } + v := arg("v") + scale := arg("scale") + if scale == 0 { + scale = 8 + } + font := req.FormValue("font") + pt := arg("pt") + var mm []image.Image + for m := 0; m < 8; m++ { + mm = append(mm, makeMask(req, font, pt, v, m, scale)) + } + dx := mm[0].Bounds().Dx() + dy := mm[0].Bounds().Dy() + + sep := arg("sep") + if sep == 0 { + sep = 10 + } + c := image.NewRGBA(image.Rect(0, 0, (dx+sep)*4-sep, (dy+sep)*2-sep)) + for m := 0; m < 8; m++ { + x := (m % 4) * (dx + sep) + y := (m / 4) * (dy + sep) + draw.Draw(c, c.Bounds().Add(image.Pt(x, y)), mm[m], image.ZP, draw.Src) + } + + w.Header().Set("Cache-Control", "public, max-age=3600") + w.Write(pngEncode(c)) +} + +var maskName = []string{ + "(x+y) % 2", + "y % 2", + "x % 3", + "(x+y) % 3", + "(y/2 + x/3) % 2", + "xy%2 + xy%3", + "(xy%2 + xy%3) % 2", + "(xy%3 + (x+y)%2) % 2", +} + +func makeMask(req *http.Request, font string, pt int, vers, mask, scale int) image.Image { + p, err := coding.NewPlan(coding.Version(vers), coding.L, coding.Mask(mask)) + if err != nil { + panic(err) + } + m := makeImage(req, maskName[mask], font, pt, len(p.Pixel), 0, scale, func(x, y int) uint32 { + pix := p.Pixel[y][x] + switch pix.Role() { + case coding.Data, coding.Check: + if pix&coding.Invert != 0 { + return 0x000000ff + } + } + return 0xffffffff + }) + return m +} + +var blockColors = []uint32{ + 0x7777ffff, + 0xffff77ff, + 0xff7777ff, + 0x77ffffff, + 0x1e90ffff, + 0xffffe0ff, + 0x8b6969ff, + 0x77ff77ff, + 0x9b30ffff, + 0x00bfffff, + 0x90e890ff, + 0xfff68fff, + 0xffec8bff, + 0xffa07aff, + 0xffa54fff, + 0xeee8aaff, + 0x98fb98ff, + 0xbfbfbfff, + 0x54ff9fff, + 0xffaeb9ff, + 0xb23aeeff, + 0xbbffffff, + 0x7fffd4ff, + 0xff7a7aff, + 0x00007fff, +} + +func dark(x uint32) uint32 { + r, g, b, a := byte(x>>24), byte(x>>16), byte(x>>8), byte(x) + r = r/2 + r/4 + g = g/2 + g/4 + b = b/2 + b/4 + return uint32(r)<<24 | uint32(g)<<16 | uint32(b)<<8 | uint32(a) +} + +func clamp(x int) byte { + if x < 0 { + return 0 + } + if x > 255 { + return 255 + } + return byte(x) +} + +func max(x, y int) int { + if x > y { + return x + } + return y +} + +// Arrow handles a request for an arrow pointing in a given direction. +func Arrow(w http.ResponseWriter, req *http.Request) { + arg := func(s string) int { x, _ := strconv.Atoi(req.FormValue(s)); return x } + dir := arg("dir") + size := arg("size") + if size == 0 { + size = 50 + } + del := size / 10 + + m := image.NewRGBA(image.Rect(0, 0, size, size)) + + if dir == 4 { + draw.Draw(m, m.Bounds(), image.Black, image.ZP, draw.Src) + draw.Draw(m, image.Rect(5, 5, size-5, size-5), image.White, image.ZP, draw.Src) + } + + pt := func(x, y int, c color.RGBA) { + switch dir { + case 0: + m.SetRGBA(x, y, c) + case 1: + m.SetRGBA(y, size-1-x, c) + case 2: + m.SetRGBA(size-1-x, size-1-y, c) + case 3: + m.SetRGBA(size-1-y, x, c) + } + } + + for y := 0; y < size/2; y++ { + for x := 0; x < del && x < y; x++ { + pt(x, y, color.RGBA{0, 0, 0, 255}) + } + for x := del; x < y-del; x++ { + pt(x, y, color.RGBA{128, 128, 255, 255}) + } + for x := max(y-del, 0); x <= y; x++ { + pt(x, y, color.RGBA{0, 0, 0, 255}) + } + } + for y := size / 2; y < size; y++ { + for x := 0; x < del && x < size-1-y; x++ { + pt(x, y, color.RGBA{0, 0, 0, 255}) + } + for x := del; x < size-1-y-del; x++ { + pt(x, y, color.RGBA{128, 128, 192, 255}) + } + for x := max(size-1-y-del, 0); x <= size-1-y; x++ { + pt(x, y, color.RGBA{0, 0, 0, 255}) + } + } + + w.Header().Set("Cache-Control", "public, max-age=3600") + w.Write(pngEncode(m)) +} + +// Encode encodes a string using the given version, level, and mask. +func Encode(w http.ResponseWriter, req *http.Request) { + val := func(s string) int { + v, _ := strconv.Atoi(req.FormValue(s)) + return v + } + + l := coding.Level(val("l")) + v := coding.Version(val("v")) + enc := coding.String(req.FormValue("t")) + m := coding.Mask(val("m")) + + p, err := coding.NewPlan(v, l, m) + if err != nil { + panic(err) + } + cc, err := p.Encode(enc) + if err != nil { + panic(err) + } + + c := &qr.Code{Bitmap: cc.Bitmap, Size: cc.Size, Stride: cc.Stride, Scale: 8} + w.Header().Set("Content-Type", "image/png") + w.Header().Set("Cache-Control", "public, max-age=3600") + w.Write(c.PNG()) +} + |