forked from disintegration/gift
/
colors_test.go
770 lines (722 loc) · 17.2 KB
/
colors_test.go
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package gift
import (
"image"
"image/color"
"image/draw"
"math"
"testing"
)
func TestLut(t *testing.T) {
fn := func(v float32) float32 {
return v
}
for _, size := range []int{10, 100, 1000} {
lut := prepareLut(size, fn)
l := len(lut)
if l != size {
t.Errorf("LUT bad size: expected %v got %v", size, l)
}
if lut[0] != 0 {
t.Errorf("LUT bad start value: expected 0 got %v", lut[0])
}
if lut[l-1] != 1 {
t.Errorf("LUT bad end value: expected 1 got %v", lut[l-1])
}
}
lut := prepareLut(10000, fn)
for _, u := range []float32{0.0, 0.0001, 0.5555, 0.9999, 1.0} {
v := getFromLut(lut, u)
if math.Abs(float64(v-u)) > 0.0001 {
t.Errorf("LUT bad value: expected %v got %v", u, v)
}
}
}
func TestInvert(t *testing.T) {
src := image.NewGray(image.Rect(0, 0, 256, 1))
for i := 0; i <= 255; i++ {
src.Pix[i] = uint8(i)
}
g := New(Invert())
dst := image.NewGray(g.Bounds(src.Bounds()))
g.Draw(dst, src)
for i := 0; i <= 255; i++ {
if dst.Pix[i] != 255-src.Pix[i] {
t.Errorf("InvertColors: index %d: expected %d got %d", i, 255-src.Pix[i], dst.Pix[i])
}
}
}
func TestColorspaceSRGBToLinear(t *testing.T) {
vals := []float32{
0.00000,
0.01002,
0.03310,
0.07324,
0.13287,
0.21404,
0.31855,
0.44799,
0.60383,
0.78741,
1.00000,
}
imgs := []draw.Image{
image.NewGray(image.Rect(0, 0, 11, 11)),
image.NewGray(image.Rect(0, 0, 111, 111)),
image.NewGray16(image.Rect(0, 0, 11, 11)),
image.NewGray16(image.Rect(0, 0, 1111, 1111)),
}
for _, img := range imgs {
for i := 0; i <= 10; i++ {
img.Set(i, 0, color.Gray{uint8(255 * float32(i) / 10.0)})
}
img2 := image.NewGray(img.Bounds())
New(ColorspaceSRGBToLinear()).Draw(img2, img)
if !img2.Bounds().Size().Eq(img.Bounds().Size()) {
t.Errorf("ColorspaceSRGBToLinear bad result size: expected %v got %v", img.Bounds().Size(), img2.Bounds().Size())
}
for i := 0; i <= 10; i++ {
expected := uint8(vals[i]*255.0 + 0.5)
c := img2.At(i, 0).(color.Gray)
if math.Abs(float64(c.Y)-float64(expected)) > 1 {
t.Errorf("ColorspaceSRGBToLinear bad color value at index %v expected %v got %v", i, expected, c.Y)
}
}
}
}
func TestColorspaceLinearToSRGB(t *testing.T) {
vals := []float32{
0.00000,
0.34919,
0.48453,
0.58383,
0.66519,
0.73536,
0.79774,
0.85431,
0.90633,
0.95469,
1.00000,
}
imgs := []draw.Image{
image.NewGray(image.Rect(0, 0, 11, 11)),
image.NewGray(image.Rect(0, 0, 111, 111)),
image.NewGray16(image.Rect(0, 0, 11, 11)),
image.NewGray16(image.Rect(0, 0, 1111, 1111)),
}
for _, img := range imgs {
for i := 0; i <= 10; i++ {
img.Set(i, 0, color.Gray{uint8(255 * float32(i) / 10.0)})
}
img2 := image.NewGray(img.Bounds())
New(ColorspaceLinearToSRGB()).Draw(img2, img)
if !img2.Bounds().Size().Eq(img.Bounds().Size()) {
t.Errorf("ColorspaceLinearRGBToSRGB bad result size: expected %v got %v", img.Bounds().Size(), img2.Bounds().Size())
}
for i := 0; i <= 10; i++ {
expected := uint8(vals[i]*255.0 + 0.5)
c := img2.At(i, 0).(color.Gray)
if math.Abs(float64(c.Y)-float64(expected)) > 1 {
t.Errorf("ColorspaceLinearRGBToSRGB bad color value at index %v expected %v got %v", i, expected, c.Y)
}
}
}
}
func TestAdjustGamma(t *testing.T) {
src := image.NewGray(image.Rect(0, 0, 256, 1))
dst := image.NewGray(image.Rect(0, 0, 256, 1))
for i := 0; i <= 255; i++ {
src.Pix[i] = uint8(i)
}
ag := Gamma(2.0)
ag.Draw(dst, src, nil)
for i := 100; i <= 150; i++ {
if dst.Pix[i] <= src.Pix[i] {
t.Errorf("Gamma unexpected color")
}
}
ag = Gamma(0.5)
ag.Draw(dst, src, nil)
for i := 100; i <= 150; i++ {
if dst.Pix[i] >= src.Pix[i] {
t.Errorf("Gamma unexpected color")
}
}
ag = Gamma(1.0)
ag.Draw(dst, src, nil)
for i := 100; i <= 150; i++ {
if dst.Pix[i] != src.Pix[i] {
t.Errorf("Gamma unexpected color")
}
}
}
func TestContrast(t *testing.T) {
testData := []struct {
desc string
p float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"contrast (0)",
0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"contrast (30)",
30,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x25, 0x00, 0x25, 0x00,
0x53, 0xC5, 0xAE, 0xC5, 0x53,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"contrast (-30)",
-30,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x26, 0x53, 0x26, 0x53, 0x26,
0x69, 0xA1, 0x96, 0xA1, 0x69,
0x26, 0x80, 0x26, 0x80, 0x26,
},
},
{
"contrast (100)",
100,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0xFF, 0x00, 0xFF, 0x00,
},
},
{
"contrast (200)",
200,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0xFF, 0x00, 0xFF, 0x00,
},
},
{
"contrast (-100)",
-100,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80,
},
},
{
"contrast (-200)",
-200,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := Contrast(d.p)
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}
func TestBrightness(t *testing.T) {
testData := []struct {
desc string
p float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"brightness (0)",
0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"brightness (30)",
30,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x4D, 0x8D, 0x4D, 0x8D, 0x4D,
0xAD, 0xFD, 0xED, 0xFD, 0xAD,
0x4D, 0xCD, 0x4D, 0xCD, 0x4D,
},
},
{
"brightness (-30)",
-30,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x14, 0x64, 0x53, 0x64, 0x14,
0x00, 0x34, 0x00, 0x34, 0x00,
},
},
{
"brightness (100)",
100,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
{
"brightness (200)",
200,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
{
"brightness (-100)",
-100,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"brightness (-200)",
-200,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := Brightness(d.p)
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}
func TestSigmoid(t *testing.T) {
testData := []struct {
desc string
midpoint, factor float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"sigmoid (0.5, 0)",
0.5, 0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"sigmoid (0.5, 3)",
0.5, 3,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x38, 0x00, 0x38, 0x00,
0x5B, 0xB7, 0xA5, 0xB7, 0x5B,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"sigmoid (0.5, -3)",
0.5, -3,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x48, 0x00, 0x48, 0x00,
0x65, 0xA9, 0x9B, 0xA9, 0x65,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := Sigmoid(d.midpoint, d.factor)
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}
func TestGrayscale(t *testing.T) {
testData := []struct {
desc string
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"grayscale 0x0",
image.Rect(0, 0, 0, 0),
image.Rect(0, 0, 0, 0),
[]uint8{},
[]uint8{},
},
{
"grayscale 2x3",
image.Rect(-1, -1, 1, 2),
image.Rect(0, 0, 2, 3),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0xFF, 0x00, 0x88, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
},
[]uint8{
0x0D, 0x0D, 0x0D, 0x30, 0x5C, 0x5C, 0x5C, 0xFF,
0xe3, 0xe3, 0xe3, 0xC0, 0x56, 0x56, 0x56, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
}
for _, d := range testData {
src := image.NewNRGBA(d.srcb)
src.Pix = d.srcPix
f := Grayscale()
dst := image.NewNRGBA(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}
func TestSepia(t *testing.T) {
testData := []struct {
desc string
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"sepia 0x0",
image.Rect(0, 0, 0, 0),
image.Rect(0, 0, 0, 0),
[]uint8{},
[]uint8{},
},
{
"sepia 2x3",
image.Rect(-1, -1, 1, 2),
image.Rect(0, 0, 2, 3),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0xFF, 0x00, 0x88, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
},
[]uint8{
0x12, 0x10, 0x0D, 0x30, 0x7E, 0x70, 0x57, 0xFF,
0xFF, 0xFF, 0xD4, 0xC0, 0x78, 0x6B, 0x54, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xEF, 0xFF,
},
},
}
for _, d := range testData {
src := image.NewNRGBA(d.srcb)
src.Pix = d.srcPix
f := Sepia()
dst := image.NewNRGBA(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}
func TestHue(t *testing.T) {
testData := []struct {
desc string
p float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"hue 0 0x0",
0,
image.Rect(0, 0, 0, 0),
image.Rect(0, 0, 0, 0),
[]uint8{},
[]uint8{},
},
{
"hue 0",
0,
image.Rect(-1, -1, 1, 3),
image.Rect(0, 0, 2, 4),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xEE, 0x50, 0xA0, 0x77, 0xFD, 0xFE, 0xFD, 0xFD,
},
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xEE, 0x50, 0xA0, 0x77, 0xFD, 0xFE, 0xFD, 0xFD,
},
},
{
"hue -90",
-90,
image.Rect(-1, -1, 1, 3),
image.Rect(0, 0, 2, 4),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xEE, 0x50, 0xA0, 0x77, 0xFD, 0xFE, 0xFD, 0xFD,
},
[]uint8{
0x00, 0x20, 0x00, 0x30, 0x99, 0x33, 0x99, 0xFF,
0xF0, 0xD0, 0xF0, 0xC0, 0x11, 0xBB, 0x11, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0x50, 0x51, 0xEE, 0x77, 0xFE, 0xFE, 0xFD, 0xFD,
},
},
{
"hue 90",
90,
image.Rect(-1, -1, 1, 3),
image.Rect(0, 0, 2, 4),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xEE, 0x50, 0xA0, 0x77, 0xFD, 0xFE, 0xFD, 0xFD,
},
[]uint8{
0x20, 0x00, 0x20, 0x30, 0x33, 0x99, 0x33, 0xFF,
0xD0, 0xF0, 0xD0, 0xC0, 0xBB, 0x11, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xEE, 0xED, 0x50, 0x77, 0xFD, 0xFE, 0xFE, 0xFD,
},
},
}
for _, d := range testData {
src := image.NewNRGBA(d.srcb)
src.Pix = d.srcPix
f := Hue(d.p)
dst := image.NewNRGBA(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}
func TestSaturation(t *testing.T) {
testData := []struct {
desc string
p float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"saturation 0 0x0",
0,
image.Rect(0, 0, 0, 0),
image.Rect(0, 0, 0, 0),
[]uint8{},
[]uint8{},
},
{
"saturation 0",
0,
image.Rect(-1, -1, 1, 3),
image.Rect(0, 0, 2, 4),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xE0, 0x50, 0xA0, 0x77, 0xEE, 0xFE, 0xEE, 0xFD,
},
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xE0, 0x50, 0xA0, 0x77, 0xEE, 0xFE, 0xEE, 0xFD,
},
},
{
"saturation -50",
-50,
image.Rect(-1, -1, 1, 3),
image.Rect(0, 0, 2, 4),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xE0, 0x50, 0xA0, 0x77, 0xEE, 0xFE, 0xEE, 0xFD,
},
[]uint8{
0x08, 0x10, 0x18, 0x30, 0x80, 0x66, 0x4D, 0xFF,
0xE8, 0xE0, 0xD8, 0xC0, 0x3B, 0x66, 0x91, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xBC, 0x74, 0x9C, 0x77, 0xF2, 0xFA, 0xF2, 0xFD,
},
},
{
"saturation 100",
100,
image.Rect(-1, -1, 1, 3),
image.Rect(0, 0, 2, 4),
[]uint8{
0x00, 0x10, 0x20, 0x30, 0x99, 0x66, 0x33, 0xFF,
0xF0, 0xE0, 0xD0, 0xC0, 0x11, 0x66, 0xBB, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xE0, 0x50, 0xA0, 0x77, 0xEE, 0xFE, 0xEE, 0xFD,
},
[]uint8{
0x00, 0x10, 0x20, 0x30, 0xCC, 0x66, 0x00, 0xFF,
0xFF, 0xE0, 0xC1, 0xC0, 0x00, 0x66, 0xCC, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x31, 0xA3, 0x77, 0xED, 0xFF, 0xED, 0xFD,
},
},
}
for _, d := range testData {
src := image.NewNRGBA(d.srcb)
src.Pix = d.srcPix
f := Saturation(d.p)
dst := image.NewNRGBA(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}