// TestMedian tests the median quantizer on png files found in the source
// directory. Output files are prefixed with _median_. Files begining with
// _ are skipped when scanning for input files. Note nothing is tested
// with a fresh source tree--drop a png or two in the source directory
// before testing to give the test something to work on. Png files in the
// parent directory are similarly used for testing. Put files there
// to compare results of the different quantizers.
func TestMedian(t *testing.T) {
for _, p := range glob(t) {
f, err := os.Open(p)
if err != nil {
t.Log(err) // skip files that can't be opened
continue
}
img, err := png.Decode(f)
f.Close()
if err != nil {
t.Log(err) // skip files that can't be decoded
continue
}
pDir, pFile := filepath.Split(p)
for _, n := range []int{16, 256} {
// prefix _ on file name marks this as a result
fq, err := os.Create(fmt.Sprintf("%s_median_%d_%s", pDir, n, pFile))
if err != nil {
t.Fatal(err) // probably can't create any others
}
var q quant.Quantizer = median.Quantizer(n)
if err = png.Encode(fq, q.Image(img)); err != nil {
t.Fatal(err) // any problem is probably a problem for all
}
}
}
}
func main() {
mode := flag.String("mode", "median", "'median' or 'mean' (default 'median')")
size := flag.Int("size", 16, "Palette size (default 16)")
flag.Parse()
paths := flag.Args()
if len(paths) == 0 {
log.Fatal("No images specified")
}
var wg sync.WaitGroup
wg.Add(len(paths))
for _, path := range paths {
go func(path string) {
defer wg.Done()
var buff bytes.Buffer
buff.WriteString(fmt.Sprintf("\n%s\n", path))
reader, err := os.Open(path)
if err != nil {
log.Fatal(err)
}
defer reader.Close()
img, _, err := image.Decode(reader)
if err != nil {
log.Fatal(err)
}
var q quant.Quantizer
if *mode == "median" {
q = median.Quantizer(*size)
} else {
q = mean.Quantizer(*size)
}
pal := q.Palette(img)
for _, c := range pal.ColorPalette() {
r, g, b, _ := c.RGBA()
buff.WriteString(fmt.Sprintf("#%02x%02x%02x\n", uint8(r>>8), uint8(g>>8), uint8(b>>8)))
}
fmt.Print(buff.String())
}(path)
}
wg.Wait()
}
// TestDither tests Sierra24A on png files found in the source directory.
// Output files are prefixed with _dither_256_. Files begining with _
// are skipped when scanning for input files. Thus nothing is tested
// with a fresh source tree--drop a png or two in the source directory
// before testing to give the test something to work on.
func TestDither(t *testing.T) {
_, file, _, ok := runtime.Caller(0)
if !ok {
t.Fatal("runtime.Caller fail")
}
srcDir, _ := filepath.Split(file)
// ignore file names starting with _, those are result files.
imgs, err := filepath.Glob(srcDir + "[^_]*.png")
if err != nil {
t.Fatal(err)
}
const n = 256
// exercise draw.Quantizer interface
var q draw.Quantizer = median.Quantizer(n)
// exercise draw.Drawer interface
var d draw.Drawer = quant.Sierra24A{}
for _, p := range imgs {
f, err := os.Open(p)
if err != nil {
t.Error(err) // skip files that can't be opened
continue
}
img, err := png.Decode(f)
f.Close()
if err != nil {
t.Error(err) // skip files that can't be decoded
continue
}
pDir, pFile := filepath.Split(p)
// prefix _ on file name marks this as a result
fq, err := os.Create(fmt.Sprintf("%s_dither_%d_%s", pDir, n, pFile))
if err != nil {
t.Fatal(err) // probably can't create any others
}
b := img.Bounds()
pi := image.NewPaletted(b, q.Quantize(make(color.Palette, 0, n), img))
d.Draw(pi, b, img, b.Min)
if err = png.Encode(fq, pi); err != nil {
t.Fatal(err) // any problem is probably a problem for all
}
}
}
func BenchmarkPalette(b *testing.B) {
var img image.Image
for _, p := range glob(b) {
f, err := os.Open(p)
if err != nil {
b.Log(err) // skip files that can't be opened
continue
}
img, err = png.Decode(f)
f.Close()
if err != nil {
b.Log(err) // skip files that can't be decoded
continue
}
break
}
var q quant.Quantizer = median.Quantizer(256)
b.ResetTimer()
for i := 0; i < b.N; i++ {
q.Palette(img)
}
}
func (w *Weather) CreateGifImage(dateArray []string) error {
g := &gif.GIF{
Image: []*image.Paletted{},
Delay: []int{},
LoopCount: 0,
}
for _, date := range dateArray {
srcMain, err := w.downloadImage(date, "main")
if err != nil {
return err
}
srcTokyo, err := w.downloadImage(date, "tokyo")
if err != nil {
return err
}
srcNagaoka, err := w.downloadImage(date, "nagaoka")
if err != nil {
return err
}
srcKyoto, err := w.downloadImage(date, "kyoto")
if err != nil {
return err
}
q := median.Quantizer(256)
p := q.Quantize(make(color.Palette, 0, 256), srcMain)
rMain := srcMain.Bounds()
rTokyo := srcTokyo.Bounds()
rNagaoka := srcNagaoka.Bounds()
// 画像を合成
minX := rMain.Min.X
maxX := rMain.Max.X + rTokyo.Max.X
minY := rMain.Min.Y
maxY := rMain.Max.Y
paletSize := image.Rect(0, 0, maxX, maxY)
dst := image.NewPaletted(paletSize, p)
for x := minX; x < maxX; x++ {
divideX := x - rMain.Max.X
for y := minY; y < maxY; y++ {
if x < rMain.Max.X && y < rMain.Max.Y {
// whole map
dst.Set(x, y, srcMain.At(x, y))
} else if x > rMain.Max.X {
if y < rNagaoka.Max.Y {
// nagaoka
dst.Set(x, y, srcNagaoka.At(divideX, y))
} else if y > rNagaoka.Max.Y && y < rNagaoka.Max.Y+rTokyo.Max.Y {
// tokyo
divideY := y - rNagaoka.Max.Y
dst.Set(x, y, srcTokyo.At(divideX, divideY))
} else if y > rNagaoka.Max.Y+rTokyo.Max.Y {
// kyoto
divideY := y - (rNagaoka.Max.Y + rTokyo.Max.Y)
dst.Set(x, y, srcKyoto.At(divideX, divideY))
}
} else if x == rMain.Max.X /* || (x == rMain.Max.X && y == rNagaoka.Max.Y)*/ {
// 境界線塗りつぶし
dst.Set(x, y, color.RGBA{uint8(0), uint8(0), uint8(0), uint8(0)})
}
}
}
g.Image = append(g.Image, dst)
g.Delay = append(g.Delay, 100)
}
out, err := os.Create(w.Filename + ".gif")
if err != nil {
return err
}
defer out.Close()
err = gif.EncodeAll(out, g)
if err != nil {
return err
}
return nil
}
func main() {
flag.Parse()
c, err := colorful.Hex(*bg)
if err != nil {
log.Fatal(err)
}
f, err := os.Open(flag.Arg(0))
if err != nil {
log.Fatal(err)
}
src, _, err := image.Decode(f)
if err != nil {
log.Fatal(err)
}
f.Close()
g := &gif.GIF{
Image: []*image.Paletted{},
Delay: []int{},
LoopCount: 0,
}
var base float64 = (math.Pi * 2) * 10 * (*speed) / 360
if *reverse {
base *= -1
}
limit := int(360 / 10 / (*speed))
q := median.Quantizer(256)
p := q.Quantize(make(color.Palette, 0, 256), src)
for i := 0; i < limit; i++ {
dst := image.NewPaletted(src.Bounds(), p)
draw.Draw(dst, src.Bounds(), &image.Uniform{c}, image.ZP, draw.Src)
err = graphics.Rotate(dst, src, &graphics.RotateOptions{Angle: base * float64(i)})
if err != nil {
log.Fatal(err)
}
if *zoom {
w, h := float64(src.Bounds().Dx()), float64(src.Bounds().Dy())
tmp := image.NewPaletted(src.Bounds(), p)
draw.Draw(tmp, src.Bounds(), &image.Uniform{c}, image.ZP, draw.Src)
z := float64(0.5 + float64(i)/30.0)
graphics.I.
Scale(z, z).
Translate((w-w*z)/2, (h-h*z)/2).
Transform(tmp, dst, interp.Bilinear)
dst = tmp
}
g.Image = append(g.Image, dst)
g.Delay = append(g.Delay, *delay)
}
out, err := os.Create(*output)
if err != nil {
log.Fatal(err)
}
defer out.Close()
err = gif.EncodeAll(out, g)
if err != nil {
log.Fatal(err)
}
}