diff options
Diffstat (limited to 'Godeps/_workspace/src/code.google.com/p/freetype-go/example/gamma/main.go')
-rw-r--r-- | Godeps/_workspace/src/code.google.com/p/freetype-go/example/gamma/main.go | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/freetype-go/example/gamma/main.go b/Godeps/_workspace/src/code.google.com/p/freetype-go/example/gamma/main.go new file mode 100644 index 000000000..4bf7e3309 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/freetype-go/example/gamma/main.go @@ -0,0 +1,79 @@ +// 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/draw" + "image/png" + "log" + "os" + + "code.google.com/p/freetype-go/freetype/raster" +) + +func p(x, y int) raster.Point { + return raster.Point{ + X: raster.Fix32(x * 256), + Y: raster.Fix32(y * 256), + } +} + +func main() { + // Draw a rounded corner that is one pixel wide. + r := raster.NewRasterizer(50, 50) + r.Start(p(5, 5)) + r.Add1(p(5, 25)) + r.Add2(p(5, 45), p(25, 45)) + r.Add1(p(45, 45)) + r.Add1(p(45, 44)) + r.Add1(p(26, 44)) + r.Add2(p(6, 44), p(6, 24)) + r.Add1(p(6, 5)) + r.Add1(p(5, 5)) + + // Rasterize that curve multiple times at different gammas. + const ( + w = 600 + h = 200 + ) + rgba := image.NewRGBA(image.Rect(0, 0, w, h)) + draw.Draw(rgba, image.Rect(0, 0, w, h/2), image.Black, image.ZP, draw.Src) + draw.Draw(rgba, image.Rect(0, h/2, w, h), image.White, image.ZP, draw.Src) + mask := image.NewAlpha(image.Rect(0, 0, 50, 50)) + painter := raster.NewAlphaSrcPainter(mask) + gammas := []float64{1.0 / 10.0, 1.0 / 3.0, 1.0 / 2.0, 2.0 / 3.0, 4.0 / 5.0, 1.0, 5.0 / 4.0, 3.0 / 2.0, 2.0, 3.0, 10.0} + for i, g := range gammas { + draw.Draw(mask, mask.Bounds(), image.Transparent, image.ZP, draw.Src) + r.Rasterize(raster.NewGammaCorrectionPainter(painter, g)) + x, y := 50*i+25, 25 + draw.DrawMask(rgba, image.Rect(x, y, x+50, y+50), image.White, image.ZP, mask, image.ZP, draw.Over) + y += 100 + draw.DrawMask(rgba, image.Rect(x, y, x+50, y+50), image.Black, image.ZP, mask, image.ZP, draw.Over) + } + + // 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.") +} |