forked from disintegration/gift
/
pixels_test.go
569 lines (520 loc) · 14.9 KB
/
pixels_test.go
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package gift
import (
"image"
"image/color"
"image/draw"
"math"
"testing"
)
func TestNewPixelGetter(t *testing.T) {
var img image.Image
var pg *pixelGetter
img = image.NewNRGBA(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itNRGBA || pg.imgNRGBA == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter NRGBA")
}
img = image.NewNRGBA64(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itNRGBA64 || pg.imgNRGBA64 == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter NRGBA64")
}
img = image.NewRGBA(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itRGBA || pg.imgRGBA == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter RGBA")
}
img = image.NewRGBA64(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itRGBA64 || pg.imgRGBA64 == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter RGBA64")
}
img = image.NewGray(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itGray || pg.imgGray == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter Gray")
}
img = image.NewGray16(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itGray16 || pg.imgGray16 == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter Gray16")
}
img = image.NewYCbCr(image.Rect(0, 0, 1, 1), image.YCbCrSubsampleRatio422)
pg = newPixelGetter(img)
if pg.imgType != itYCbCr || pg.imgYCbCr == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter YCbCr")
}
img = image.NewUniform(color.NRGBA64{0, 0, 0, 0})
pg = newPixelGetter(img)
if pg.imgType != itGeneric || pg.imgGeneric == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter Generic(Uniform)")
}
img = image.NewAlpha(image.Rect(0, 0, 1, 1))
pg = newPixelGetter(img)
if pg.imgType != itGeneric || pg.imgGeneric == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelGetter Generic(Alpha)")
}
}
func comparePixels(px1, px2 pixel, dif float64) bool {
if math.Abs(float64(px1.R)-float64(px2.R)) > dif {
return false
}
if math.Abs(float64(px1.G)-float64(px2.G)) > dif {
return false
}
if math.Abs(float64(px1.B)-float64(px2.B)) > dif {
return false
}
if math.Abs(float64(px1.A)-float64(px2.A)) > dif {
return false
}
return true
}
func compareColorsNRGBA(c1, c2 color.NRGBA, dif int) bool {
if math.Abs(float64(c1.R)-float64(c2.R)) > float64(dif) {
return false
}
if math.Abs(float64(c1.G)-float64(c2.G)) > float64(dif) {
return false
}
if math.Abs(float64(c1.B)-float64(c2.B)) > float64(dif) {
return false
}
if math.Abs(float64(c1.A)-float64(c2.A)) > float64(dif) {
return false
}
return true
}
func TestGetPixel(t *testing.T) {
var pg *pixelGetter
// RGBA, NRGBA, RGBA64, NRGBA64
palette := []color.Color{
color.NRGBA{0, 0, 0, 0},
color.NRGBA{255, 255, 255, 255},
color.NRGBA{50, 100, 150, 255},
color.NRGBA{150, 100, 50, 200},
}
images1 := []draw.Image{
image.NewRGBA(image.Rect(-1, -2, 3, 4)),
image.NewRGBA64(image.Rect(-1, -2, 3, 4)),
image.NewNRGBA(image.Rect(-1, -2, 3, 4)),
image.NewNRGBA64(image.Rect(-1, -2, 3, 4)),
image.NewPaletted(image.Rect(-1, -2, 3, 4), palette),
}
colors1 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{0, 0, 0, 0}, pixel{0, 0, 0, 0}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 1, 1, 1}},
{color.NRGBA{50, 100, 150, 255}, pixel{0.196, 0.392, 0.588, 1}},
{color.NRGBA{150, 100, 50, 200}, pixel{0.588, 0.392, 0.196, 0.784}},
}
for _, img := range images1 {
pg = newPixelGetter(img)
for _, k := range colors1 {
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
img.Set(x, y, k.c)
px := pg.getPixel(x, y)
if !comparePixels(k.px, px, 0.005) {
t.Errorf("getPixel %T %v %dx%d %v %v", img, k.c, x, y, k.px, px)
}
}
}
}
}
// Uniform (Generic)
for _, k := range colors1 {
img := image.NewUniform(k.c)
pg = newPixelGetter(img)
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
px := pg.getPixel(x, y)
if !comparePixels(k.px, px, 0.005) {
t.Errorf("getPixel %T %v %dx%d %v %v", img, k.c, x, y, k.px, px)
}
}
}
}
// YCbCr
colors2 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{0, 0, 0, 255}, pixel{0, 0, 0, 1}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 1, 1, 1}},
{color.NRGBA{50, 100, 150, 255}, pixel{0.196, 0.392, 0.588, 1}},
}
for _, k := range colors2 {
img := image.NewYCbCr(image.Rect(-1, -2, 3, 4), image.YCbCrSubsampleRatio444)
pg = newPixelGetter(img)
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
iy := img.YOffset(x, y)
ic := img.COffset(x, y)
img.Y[iy], img.Cb[ic], img.Cr[ic] = color.RGBToYCbCr(k.c.R, k.c.G, k.c.B)
px := pg.getPixel(x, y)
if !comparePixels(k.px, px, 0.005) {
t.Errorf("getPixel %T %v %dx%d %v %v", img, k.c, x, y, k.px, px)
}
}
}
}
// Gray, Gray16
images2 := []draw.Image{
image.NewGray(image.Rect(-1, -2, 3, 4)),
image.NewGray16(image.Rect(-1, -2, 3, 4)),
}
colors3 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{0, 0, 0, 0}, pixel{0, 0, 0, 1}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 1, 1, 1}},
{color.NRGBA{50, 100, 150, 255}, pixel{0.356, 0.356, 0.356, 1}},
{color.NRGBA{150, 100, 50, 200}, pixel{0.337, 0.337, 0.337, 1}},
}
for _, img := range images2 {
pg = newPixelGetter(img)
for _, k := range colors3 {
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
img.Set(x, y, k.c)
px := pg.getPixel(x, y)
if !comparePixels(k.px, px, 0.005) {
t.Errorf("getPixel %T %v %dx%d %v %v", img, k.c, x, y, k.px, px)
}
}
}
}
}
}
func comparePixelSlices(s1, s2 []pixel, dif float64) bool {
if len(s1) != len(s2) {
return false
}
for i := 1; i < len(s1); i++ {
if !comparePixels(s1[i], s2[i], dif) {
return false
}
}
return true
}
func TestGetPixelRow(t *testing.T) {
colors := []color.NRGBA{
{0, 0, 0, 0},
{255, 255, 255, 255},
{50, 100, 150, 255},
{150, 100, 50, 200},
}
pixels := []pixel{
pixel{0, 0, 0, 0},
pixel{1, 1, 1, 1},
pixel{0.196, 0.392, 0.588, 1},
pixel{0.588, 0.392, 0.196, 0.784},
}
img := image.NewNRGBA(image.Rect(-1, -2, 3, 2))
pg := newPixelGetter(img)
var row []pixel
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
img.Set(x, y, colors[x-img.Bounds().Min.X])
}
pg.getPixelRow(y, &row)
if !comparePixelSlices(row, pixels, 0.005) {
t.Errorf("getPixelRow y=%d %v %v", y, row, pixels)
}
}
}
func TestGetPixelColumn(t *testing.T) {
colors := []color.NRGBA{
{0, 0, 0, 0},
{255, 255, 255, 255},
{50, 100, 150, 255},
{150, 100, 50, 200},
}
pixels := []pixel{
pixel{0, 0, 0, 0},
pixel{1, 1, 1, 1},
pixel{0.196, 0.392, 0.588, 1},
pixel{0.588, 0.392, 0.196, 0.784},
}
img := image.NewNRGBA(image.Rect(-1, -2, 3, 2))
pg := newPixelGetter(img)
var column []pixel
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
img.Set(x, y, colors[y-img.Bounds().Min.Y])
}
pg.getPixelColumn(x, &column)
if !comparePixelSlices(column, pixels, 0.005) {
t.Errorf("getPixelColumn x=%d %v %v", x, column, pixels)
}
}
}
func TestF32u8(t *testing.T) {
testData := []struct {
x float32
y uint8
}{
{-1.0, 0},
{0.0, 0},
{100.0, 100},
{255.0, 255},
{256.0, 255},
}
for _, p := range testData {
v := f32u8(p.x)
if v != p.y {
t.Errorf("f32u8(%f) != %d: %d", p.x, p.y, v)
}
}
}
func TestF32u16(t *testing.T) {
testData := []struct {
x float32
y uint16
}{
{-1.0, 0},
{0.0, 0},
{1.0, 1},
{10000.0, 10000},
{65535.0, 65535},
{65536.0, 65535},
}
for _, p := range testData {
v := f32u16(p.x)
if v != p.y {
t.Errorf("f32u16(%f) != %d: %d", p.x, p.y, v)
}
}
}
func TestNewPixelSetter(t *testing.T) {
var img draw.Image
var pg *pixelSetter
img = image.NewNRGBA(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itNRGBA || pg.imgNRGBA == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter NRGBA")
}
img = image.NewNRGBA64(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itNRGBA64 || pg.imgNRGBA64 == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter NRGBA64")
}
img = image.NewRGBA(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itRGBA || pg.imgRGBA == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter RGBA")
}
img = image.NewRGBA64(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itRGBA64 || pg.imgRGBA64 == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter RGBA64")
}
img = image.NewGray(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itGray || pg.imgGray == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter Gray")
}
img = image.NewGray16(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itGray16 || pg.imgGray16 == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter Gray16")
}
img = image.NewPaletted(image.Rect(0, 0, 1, 1), color.Palette{})
pg = newPixelSetter(img)
if pg.imgType != itPaletted || pg.imgPaletted == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter Paletted")
}
img = image.NewAlpha(image.Rect(0, 0, 1, 1))
pg = newPixelSetter(img)
if pg.imgType != itGeneric || pg.imgGeneric == nil || !img.Bounds().Eq(pg.imgBounds) {
t.Error("newPixelSetter Generic(Alpha)")
}
}
func TestSetPixel(t *testing.T) {
var ps *pixelSetter
// RGBA, NRGBA, RGBA64, NRGBA64
images1 := []draw.Image{
image.NewRGBA(image.Rect(-1, -2, 3, 4)),
image.NewRGBA64(image.Rect(-1, -2, 3, 4)),
image.NewNRGBA(image.Rect(-1, -2, 3, 4)),
image.NewNRGBA64(image.Rect(-1, -2, 3, 4)),
}
colors1 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{0, 0, 0, 0}, pixel{0, 0, 0, 0}},
{color.NRGBA{0, 0, 0, 255}, pixel{0, 0, 0, 1}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 1, 1, 1}},
{color.NRGBA{50, 100, 150, 255}, pixel{0.196, 0.392, 0.588, 1}},
{color.NRGBA{150, 100, 50, 200}, pixel{0.588, 0.392, 0.196, 0.784}},
}
for _, img := range images1 {
ps = newPixelSetter(img)
for _, k := range colors1 {
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
ps.setPixel(x, y, k.px)
c := color.NRGBAModel.Convert(img.At(x, y)).(color.NRGBA)
if !compareColorsNRGBA(c, k.c, 1) {
t.Errorf("setPixel %T %v %dx%d %v %v", img, k.px, x, y, k.c, c)
}
}
}
}
}
// Gray, Gray16
images2 := []draw.Image{
image.NewGray(image.Rect(-1, -2, 3, 4)),
image.NewGray16(image.Rect(-1, -2, 3, 4)),
}
colors2 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{0, 0, 0, 255}, pixel{0, 0, 0, 1}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 1, 1, 1}},
{color.NRGBA{110, 110, 110, 255}, pixel{0.2, 0.5, 0.7, 1}},
{color.NRGBA{55, 55, 55, 255}, pixel{0.2, 0.5, 0.7, 0.5}},
}
for _, img := range images2 {
ps = newPixelSetter(img)
for _, k := range colors2 {
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
ps.setPixel(x, y, k.px)
c := color.NRGBAModel.Convert(img.At(x, y)).(color.NRGBA)
if !compareColorsNRGBA(c, k.c, 1) {
t.Errorf("setPixel %T %v %dx%d %v %v", img, k.px, x, y, k.c, c)
}
}
}
}
}
// Generic(Alpha)
colors3 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{255, 255, 255, 255}, pixel{0, 0, 0, 1}},
{color.NRGBA{255, 255, 255, 127}, pixel{0.2, 0.5, 0.7, 0.5}},
{color.NRGBA{255, 255, 255, 63}, pixel{0.1, 0.2, 0.3, 0.25}},
}
img := image.NewAlpha(image.Rect(-1, -2, 3, 4))
ps = newPixelSetter(img)
for _, k := range colors3 {
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
ps.setPixel(x, y, k.px)
c := color.NRGBAModel.Convert(img.At(x, y)).(color.NRGBA)
if !compareColorsNRGBA(c, k.c, 1) {
t.Errorf("setPixel %T %v %dx%d %v %v", img, k.px, x, y, k.c, c)
}
}
}
}
// Paletted
images4 := []draw.Image{
image.NewPaletted(
image.Rect(-1, -2, 3, 4),
color.Palette{
color.NRGBA{0, 0, 0, 0},
color.NRGBA{0, 0, 0, 255},
color.NRGBA{255, 255, 255, 255},
color.NRGBA{50, 100, 150, 255},
color.NRGBA{150, 100, 50, 200},
color.NRGBA{1, 255, 255, 255},
color.NRGBA{2, 255, 255, 255},
color.NRGBA{3, 255, 255, 255},
},
),
}
colors4 := []struct {
c color.NRGBA
px pixel
}{
{color.NRGBA{0, 0, 0, 0}, pixel{0, 0, 0, 0}},
{color.NRGBA{0, 0, 0, 255}, pixel{0, 0, 0, 1}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 1, 1, 1}},
{color.NRGBA{50, 100, 150, 255}, pixel{0.196, 0.392, 0.588, 1}},
{color.NRGBA{150, 100, 50, 200}, pixel{0.588, 0.392, 0.196, 0.784}},
{color.NRGBA{0, 0, 0, 0}, pixel{0.1, 0.01, 0.001, 0.1}},
{color.NRGBA{0, 0, 0, 255}, pixel{0, 0, 0, 0.9}},
{color.NRGBA{255, 255, 255, 255}, pixel{1, 0.9, 1, 0.9}},
{color.NRGBA{1, 255, 255, 255}, pixel{0.001 / 255, 1, 1, 1}},
{color.NRGBA{1, 255, 255, 255}, pixel{1.001 / 255, 1, 1, 1}},
{color.NRGBA{2, 255, 255, 255}, pixel{2.001 / 255, 1, 1, 1}},
{color.NRGBA{3, 255, 255, 255}, pixel{3.001 / 255, 1, 1, 1}},
{color.NRGBA{3, 255, 255, 255}, pixel{4.001 / 255, 1, 1, 1}},
}
for _, img := range images4 {
ps = newPixelSetter(img)
for _, k := range colors4 {
for _, x := range []int{-1, 0, 2} {
for _, y := range []int{-2, 0, 3} {
ps.setPixel(x, y, k.px)
c := color.NRGBAModel.Convert(img.At(x, y)).(color.NRGBA)
if !compareColorsNRGBA(c, k.c, 0) {
t.Errorf("setPixel %T %v %dx%d %v %v", img, k.px, x, y, k.c, c)
}
}
}
}
}
}
func TestSetPixelRow(t *testing.T) {
colors := []color.NRGBA{
{0, 0, 0, 0},
{255, 255, 255, 255},
{50, 100, 150, 255},
{150, 100, 50, 200},
}
pixels := []pixel{
pixel{0, 0, 0, 0},
pixel{1, 1, 1, 1},
pixel{0.196, 0.392, 0.588, 1},
pixel{0.588, 0.392, 0.196, 0.784},
}
img := image.NewNRGBA(image.Rect(-1, -2, 3, 2))
ps := newPixelSetter(img)
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
ps.setPixelRow(y, pixels)
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
c := img.At(x, y).(color.NRGBA)
wantedColor := colors[x-img.Bounds().Min.X]
if !compareColorsNRGBA(wantedColor, c, 1) {
t.Errorf("setPixelRow y=%d x=%d %v %v", y, x, wantedColor, c)
}
}
}
}
func TestSetPixelColumn(t *testing.T) {
colors := []color.NRGBA{
{0, 0, 0, 0},
{255, 255, 255, 255},
{50, 100, 150, 255},
{150, 100, 50, 200},
}
pixels := []pixel{
pixel{0, 0, 0, 0},
pixel{1, 1, 1, 1},
pixel{0.196, 0.392, 0.588, 1},
pixel{0.588, 0.392, 0.196, 0.784},
}
img := image.NewNRGBA(image.Rect(-1, -2, 3, 2))
ps := newPixelSetter(img)
for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
ps.setPixelColumn(x, pixels)
for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
c := img.At(x, y).(color.NRGBA)
wantedColor := colors[y-img.Bounds().Min.Y]
if !compareColorsNRGBA(wantedColor, c, 1) {
t.Errorf("setPixelColumn x=%d y=%d %v %v", x, y, wantedColor, c)
}
}
}
}