func superSampling(inputImage image.Image) image.Image {
rect := inputImage.Bounds()
width := rect.Size().X
height := rect.Size().Y
rect2 := image.Rect(rect.Min.X, rect.Min.Y, rect.Max.X-1, rect.Max.Y-1)
rgba := image.NewRGBA(rect2)
for x := 0; x < width-1; x++ {
for y := 0; y < height-1; y++ {
var col color.RGBA
// 座標(x,y)のR, G, B, α の値を取得
r00, g00, b00, a00 := inputImage.At(x, y).RGBA()
r01, g01, b01, a01 := inputImage.At(x, y+1).RGBA()
r10, g10, b10, a10 := inputImage.At(x+1, y).RGBA()
r11, g11, b11, a11 := inputImage.At(x+1, y+1).RGBA()
col.R = uint8((uint(uint8(r00)) + uint(uint8(r01)) + uint(uint8(r10)) + uint(uint8(r11))) / 4)
col.G = uint8((uint(uint8(g00)) + uint(uint8(g01)) + uint(uint8(g10)) + uint(uint8(g11))) / 4)
col.B = uint8((uint(uint8(b00)) + uint(uint8(b01)) + uint(uint8(b10)) + uint(uint8(b11))) / 4)
col.A = uint8((uint(uint8(a00)) + uint(uint8(a01)) + uint(uint8(a10)) + uint(uint8(a11))) / 4)
rgba.Set(x, y, col)
}
}
return rgba.SubImage(rect)
}
func (c attrColor) RGBA() (r, g, b, a uint32) {
switch termbox.Attribute(c) {
case termbox.ColorBlack:
return 0, 0, 0, math.MaxUint16
case termbox.ColorRed:
return math.MaxUint16, 0, 0, math.MaxUint16
case termbox.ColorGreen:
return 0, math.MaxUint16, 0, math.MaxUint16
case termbox.ColorYellow:
return math.MaxUint16, math.MaxUint16, 0, math.MaxUint16
case termbox.ColorBlue:
return 0, 0, math.MaxUint16, math.MaxUint16
case termbox.ColorMagenta:
return math.MaxUint16, 0, math.MaxUint16, math.MaxUint16
case termbox.ColorCyan:
return 0, math.MaxUint16, math.MaxUint16, math.MaxUint16
case termbox.ColorWhite:
return math.MaxUint16, math.MaxUint16, math.MaxUint16, math.MaxUint16
}
switch {
case c >= 16 && c <= 231:
c -= 16
rgba := color.RGBA{R: base[(c/36)%6], G: base[(c/6)%6], B: base[c%6], A: 0xff}
return rgba.RGBA()
case c >= 232 && c <= 255:
x := uint8(0x08 + 0xa*(c-232))
rgba := color.RGBA{R: x, G: x, B: x, A: 0xff}
return rgba.RGBA()
}
panic("not found")
}
func (cf *ColorFinder) findMainColor(colorMap *map[color.RGBA]colorStats, shift uint, targetColor *shiftedRGBA) shiftedRGBA {
colorWeights := make(map[shiftedRGBA]float64)
bounds := cf.img.Bounds()
stepLength := stepLength(bounds)
for y := bounds.Min.Y; y < bounds.Max.Y; y += stepLength {
for x := bounds.Min.X; x < bounds.Max.X; x += stepLength {
r, g, b, a := cf.img.At(x, y).RGBA()
color := color.RGBA{}
color.R = uint8(r >> shiftRGB)
color.G = uint8(g >> shiftRGB)
color.B = uint8(b >> shiftRGB)
color.A = uint8(a >> shiftRGB)
if rgbMatchesTargetColor(targetColor, &color) {
increaseColorWeight(&colorWeights, colorMap, &color, shift)
}
}
}
maxColor := shiftedRGBA{}
maxWeight := 0.0
for sRGB, weight := range colorWeights {
if weight > maxWeight {
maxColor = sRGB
maxWeight = weight
}
}
return maxColor
}
func colorForPixel(isBlack bool) color.RGBA {
col := color.RGBA{}
if isBlack {
col.A = 255
}
return col
}
func (cf *ColorFinder) buildColorMap() *map[color.RGBA]colorStats {
colorMap := make(map[color.RGBA]colorStats)
bounds := cf.img.Bounds()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
r, g, b, a := cf.img.At(x, y).RGBA()
rgb := color.RGBA{}
rgb.R = uint8(r >> shiftRGB)
rgb.G = uint8(g >> shiftRGB)
rgb.B = uint8(b >> shiftRGB)
rgb.A = uint8(a >> shiftRGB)
colrStats, exist := colorMap[rgb]
if exist {
colrStats.count++
} else {
colrStats := colorStats{count: 1, weight: weight(&rgb)}
if colrStats.weight <= 0 {
colrStats.weight = 1e-10
}
colorMap[rgb] = colrStats
}
}
}
return &colorMap
}
func (s *S) TestColor(c *check.C) {
for r := 0; r < 256; r += 5 {
for g := 0; g < 256; g += 5 {
for b := 0; b < 256; b += 5 {
col := color.RGBA{uint8(r), uint8(g), uint8(b), 0}
cDirectR, cDirectG, cDirectB, cDirectA := col.RGBA()
hsva := RGBAtoHSVA(col.RGBA())
c.Check(hsva.H, floatWithinRange, float64(0), float64(360))
c.Check(hsva.S, floatWithinRange, float64(0), float64(1))
c.Check(hsva.V, floatWithinRange, float64(0), float64(1))
cFromHSVR, cFromHSVG, cFromHSVB, cFromHSVA := hsva.RGBA()
c.Check(cFromHSVR, uintWithinRange, uint32(0), uint32(0xFFFF))
c.Check(cFromHSVG, uintWithinRange, uint32(0), uint32(0xFFFF))
c.Check(cFromHSVB, uintWithinRange, uint32(0), uint32(0xFFFF))
back := RGBAtoHSVA(color.RGBA{uint8(cFromHSVR >> 8), uint8(cFromHSVG >> 8), uint8(cFromHSVB >> 8), uint8(cFromHSVA)}.RGBA())
c.Check(hsva, check.Equals, back)
c.Check(cFromHSVR, withinEpsilon, cDirectR, e)
c.Check(cFromHSVG, withinEpsilon, cDirectG, e)
c.Check(cFromHSVB, withinEpsilon, cDirectB, e)
c.Check(cFromHSVA, check.Equals, cDirectA)
if c.Failed() {
return
}
}
}
}
}
func main() {
img := shapes.FilledImage(500, 300, image.White)
fill := color.RGBA{200, 200, 200, 255}
for i := 0; i < 10; i++ {
width, height := 50+(20*i), 30+(10*i)
rect, err := shapes.New("rectangle", shapes.Option{Fill: fill, Rect: image.Rect(0, 0, width, height), Filled: true})
if err != nil {
log.Fatal(err)
}
x := 10 + (20 * i)
for j := i / 2; j >= 0; j-- {
rect.Draw(img, x+j, (x/2)+j)
}
fill.R -= uint8(i * 5)
fill.G = fill.R
fill.B = fill.R
}
shapes.SaveImage(img, "rectangle.png")
}
// Convert a []float64 to an image, reading data with the format specified in
// chans (e.g. RGBA, BGRA, BRG, RRR). If a component is not specified in the
func FromSliceChans(img *Image, chans string, fill float64, data []float64) {
surf := img.Surf
cm := surf.ColorModel()
b := surf.Bounds()
minX, maxX := b.Min.X, b.Max.X
minY, maxY := b.Min.Y, b.Max.Y
k := 0
nc := len(chans)
const mk = 0xff
dfill := clamp8(fill) & mk
for i := minY; i < maxY; i++ {
for j := minX; j < maxX; j++ {
outCol := color.RGBA{dfill, dfill, dfill, dfill}
for c := 0; c < nc; c++ {
switch chans[c] {
case 'r', 'R':
outCol.R = clamp8(data[k+c]) & mk
case 'g', 'G':
outCol.G = clamp8(data[k+c]) & mk
case 'b', 'B':
outCol.B = clamp8(data[k+c]) & mk
case 'a', 'A':
outCol.A = clamp8(data[k+c]) & mk
default:
// Just skip the channel
}
}
k += nc
img.Surf.Set(j, i, cm.Convert(outCol))
}
}
}
// Return the complementary color
func Complementary(v color.RGBA) [2]color.RGBA {
var result color.RGBA
result.R = 255 - v.R
result.G = 255 - v.G
result.B = 255 - v.B
result.A = v.A
return [2]color.RGBA{v, result}
}
// Apply the given color mapping to the specified image buffers.
func Apply(from, to *Rule, src, dst draw.Image) {
var x, y int
var r, g, b, a uint32
var sc color.Color
var dc color.RGBA
var pix pixel
rect := src.Bounds()
for y = 0; y < rect.Dy(); y++ {
for x = 0; x < rect.Dx(); x++ {
sc = src.At(x, y)
r, g, b, a = sc.RGBA()
pix.r = uint8(r >> 8)
pix.g = uint8(g >> 8)
pix.b = uint8(b >> 8)
pix.a = uint8(a >> 8)
// Check if the pixel matches the filter rule.
if !(match(pix.r, from.R) && match(pix.g, from.G) && match(pix.b, from.B) && match(pix.a, from.A)) {
dst.Set(x, y, sc)
continue
}
// Compute three different types of grayscale conversion.
// These can be applied by named references.
pix.average = uint8(((r + g + b) / 3) >> 8)
pix.lightness = uint8(((min(min(r, g), b) + max(max(r, g), b)) / 2) >> 8)
// For luminosity it is necessary to apply an inverse of the gamma
// function for the color space before calculating the inner product.
// Then you apply the gamma function to the reduced value. Failure to
// incorporate the gamma function can result in errors of up to 20%.
//
// For typical computer stuff, the color space is sRGB. The right
// numbers for sRGB are approx. 0.21, 0.72, 0.07. Gamma for sRGB
// is a composite function that approximates exponentiation by 1/2.2
//
// This is a rather expensive operation, but gives a much more accurate
// and satisfactory result than the average and lightness versions.
pix.luminosity = gammaSRGB(
0.212655*invGammaSRGB(pix.r) +
0.715158*invGammaSRGB(pix.g) +
0.072187*invGammaSRGB(pix.b))
// Transform color.
dc.R = transform(&pix, pix.r, to.R)
dc.G = transform(&pix, pix.g, to.G)
dc.B = transform(&pix, pix.b, to.B)
dc.A = transform(&pix, pix.a, to.A)
// Set new pixel.
dst.Set(x, y, dc)
}
}
}
func setAlpha(c color.RGBA, a uint8) color.RGBA {
if c.A == 0 {
return c
}
c.R = mult(c.R, a, c.A)
c.G = mult(c.G, a, c.A)
c.B = mult(c.B, a, c.A)
c.A = a
return c
}
func TestColor(t *testing.T) {
for r := 0; r < 256; r += 5 {
for g := 0; g < 256; g += 5 {
for b := 0; b < 256; b += 5 {
col := color.RGBA{uint8(r), uint8(g), uint8(b), 0}
cDirectR, cDirectG, cDirectB, cDirectA := col.RGBA()
hsva := rgbaToHsva(col.RGBA())
if hsva.H < 0 || hsva.H > 1 {
t.Errorf("unexpected values for H: want [0, 1] got:%f", hsva.H)
}
if hsva.S < 0 || hsva.S > 1 {
t.Errorf("unexpected values for S: want [0, 1] got:%f", hsva.S)
}
if hsva.V < 0 || hsva.V > 1 {
t.Errorf("unexpected values for V: want [0, 1] got:%f", hsva.V)
}
cFromHSVR, cFromHSVG, cFromHSVB, cFromHSVA := hsva.RGBA()
if cFromHSVR < 0 || cFromHSVR > 0xFFFF {
t.Errorf("unexpected values for H: want [0x0, 0xFFFF] got:%f", hsva.H)
}
if cFromHSVG < 0 || cFromHSVG > 0xFFFF {
t.Errorf("unexpected values for S: want [0x0, 0xFFFF] got:%f", hsva.S)
}
if cFromHSVB < 0 || cFromHSVB > 0xFFFF {
t.Errorf("unexpected values for V: want [0x0, 0xFFFF] got:%f", hsva.V)
}
if cFromHSVA < 0 || cFromHSVA > 0xFFFF {
t.Errorf("unexpected values for V: want [0x0, 0xFFFF] got:%f", hsva.V)
}
back := rgbaToHsva(color.RGBA{uint8(cFromHSVR >> 8), uint8(cFromHSVG >> 8), uint8(cFromHSVB >> 8), uint8(cFromHSVA)}.RGBA())
if hsva != back {
t.Errorf("roundtrip error: got:%#v want:%#v", back, hsva)
}
const epsilon = 1
if !withinEpsilon(cFromHSVR, cDirectR, epsilon) {
t.Errorf("roundtrip error for R: got:%d want:%d", cFromHSVR, cDirectR)
}
if !withinEpsilon(cFromHSVG, cDirectG, epsilon) {
t.Errorf("roundtrip error for G: got:%d want:%d %d", cFromHSVG, cDirectG, cFromHSVG-cDirectG)
}
if !withinEpsilon(cFromHSVB, cDirectB, epsilon) {
t.Errorf("roundtrip error for B: got:%d want:%d", cFromHSVB, cDirectB)
}
if cFromHSVA != cDirectA {
t.Errorf("roundtrip error for A: got:%d want:%d", cFromHSVA, cDirectA)
}
if t.Failed() {
return
}
}
}
}
}
func DistanceBetweenColors(color1, color2 color.RGBA) float64 {
r1, g1, b1, _ := color1.RGBA()
r2, g2, b2, _ := color2.RGBA()
rDiff := math.Pow(lolDiff(r1, r2), 2.0)
gDiff := math.Pow(lolDiff(g1, g2), 2.0)
bDiff := math.Pow(lolDiff(b1, b2), 2.0)
sum := rDiff + gDiff + bDiff
return math.Sqrt(sum)
}
// SetAll sets the given values for the channels
func (d *Dioder) SetAll(colorSet color.RGBA) {
d.ColorConfiguration = colorSet
//Red
colorSet.R = calculateOpacity(colorSet.R, colorSet.A)
d.SetChannelInteger(colorSet.R, d.PinConfiguration.Red)
//Green
colorSet.G = calculateOpacity(colorSet.G, colorSet.A)
d.SetChannelInteger(colorSet.G, d.PinConfiguration.Green)
//Blue
colorSet.B = calculateOpacity(colorSet.B, colorSet.A)
d.SetChannelInteger(colorSet.B, d.PinConfiguration.Blue)
}
func plot(img *image.RGBA, x, y int, c *color.RGBA) {
r0, g0, b0, a0 := img.At(x, y).RGBA() // background color
r1, g1, b1, a1 := c.RGBA() // foreground color
var alpha0 float64 = float64(a0) / float64(0xff) // background alpha
var alpha1 float64 = float64(a1) / float64(0xff) // foreground alpha
// resulting colors
var r uint8 = uint8(alpha1*float64(r1) + (1.0-alpha1)*float64(r0))
var g uint8 = uint8(alpha1*float64(g1) + (1.0-alpha1)*float64(g0))
var b uint8 = uint8(alpha1*float64(b1) + (1.0-alpha1)*float64(b0))
var a uint8 = uint8(0xff * (alpha1 + alpha0*(1.0-alpha1)))
pxl := color.RGBA{r, g, b, a} // resulting pixel
img.Set(x, y, pxl)
}
func mapToColor(o map[string]interface{}) color.Color {
var c color.RGBA
// Because JavaScript
switch x := o["r"].(type) {
case int64:
c.R = uint8(colorF(float64(x)))
case float64:
c.R = uint8(colorF(x))
}
switch x := o["g"].(type) {
case int64:
c.G = uint8(colorF(float64(x)))
case float64:
c.G = uint8(colorF(x))
}
switch x := o["b"].(type) {
case int64:
c.B = uint8(colorF(float64(x)))
case float64:
c.B = uint8(colorF(x))
}
c.A = 0xff
return c
}
func TestWritePng(t *testing.T) {
img1 := NewImage(100, 100)
col1 := color.RGBA{0, 11, 0, 255}
img1.DrawDot(4, 5, col1)
var buf bytes.Buffer
img1.WritePng(&buf)
img2, _ := png.Decode(&buf)
col2 := img2.At(4, 5)
_, r1, _, _ := col1.RGBA()
_, r2, _, _ := col2.RGBA()
if r2 != r1 {
t.Errorf("expected '%v' but got '%v'", r1, r2)
}
}
func parseColors(args []*ast.BasicLit) (color.RGBA, error) {
ints := make([]uint8, 4)
var ret color.RGBA
var u uint8
for i := range args {
v := args[i]
switch v.Kind {
case token.FLOAT:
f, err := strconv.ParseFloat(args[i].Value, 8)
if err != nil {
return ret, err
}
// Has to be alpha, or bust
u = uint8(f * 100)
case token.INT:
i, err := strconv.Atoi(v.Value)
if err != nil {
return ret, err
}
u = uint8(i)
case token.COLOR:
if i != 0 {
return ret, fmt.Errorf("hex is only allowed as the first argumetn found: % #v", v)
}
var err error
ret, err = ast.ColorFromHexString(v.Value)
if err != nil {
return ret, err
}
// This is only allowed as the first argument
i = i + 2
default:
log.Fatalf("unsupported kind %s % #v\n", v.Kind, v)
}
ints[i] = u
}
if ints[0] > 0 {
ret.R = ints[0]
}
if ints[1] > 0 {
ret.G = ints[1]
}
if ints[2] > 0 {
ret.B = ints[2]
}
if ints[3] > 0 {
ret.A = ints[3]
}
return ret, nil
}
func adjustColor(ca color.RGBA, cb color.Color, n uint8) color.RGBA {
r, g, b, a := ca.RGBA()
retR := uint8(r)
retG := uint8(g)
retB := uint8(b)
retA := uint8(a)
r, g, b, a = cb.RGBA()
retR += uint8(r) / n
retG += uint8(g) / n
retB += uint8(b) / n
retA += uint8(a) / n
return color.RGBA{retR, retG, retB, retA}
}
func blend(orig image.Image) (m image.Image) {
// deviation range
dev := uint16(50 << 8)
c := new(color.RGBA)
c.A = 255
bounds := orig.Bounds()
// iterations
for i := 0; i < 10; i++ {
newm := image.NewRGBA(bounds)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
var r, g, b, ct uint32
_r, _g, _b, _ := orig.At(x, y).RGBA()
for i := -1; i < 2; i++ {
for j := -1; j < 2; j++ {
rt, gt, bt, _ := orig.At(x+i, y+j).RGBA()
if uint16(rt-_r) > dev || uint16(gt-_g) > dev || uint16(bt-_b) > dev {
continue
}
r += rt
g += gt
b += bt
ct++
}
}
c.R = uint8((r / ct) >> 8)
c.G = uint8((g / ct) >> 8)
c.B = uint8((b / ct) >> 8)
newm.Set(x, y, c)
}
}
m = newm
}
return
}
func main() {
img := shapes.FilledImage(420, 220, image.White)
fill := color.RGBA{200, 200, 200, 0xFF} // light gray
for i := 0; i < 10; i++ {
width, height := 40+(20*i), 20+(10*i)
rectangle := shapes.Rectangle{fill,
image.Rect(0, 0, width, height), true}
x := 10 + (20 * i)
for j := i / 2; j >= 0; j-- {
rectangle.Draw(img, x+j, (x/2)+j)
}
fill.R -= uint8(i * 5)
fill.G = fill.R
fill.B = fill.R
}
shapes.SaveImage(img, "rectangle.png")
}
func DrawImage(src image.Image, dest draw.Image, tr MatrixTransform, op draw.Op, filter ImageFilter) {
bounds := src.Bounds()
x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Max.X), float64(bounds.Max.Y)
tr.TransformRectangle(&x0, &y0, &x1, &y1)
var x, y, u, v float64
var c1, c2, cr color.Color
var r, g, b, a, ia, r1, g1, b1, a1, r2, g2, b2, a2 uint32
var color color.RGBA
for x = x0; x < x1; x++ {
for y = y0; y < y1; y++ {
u = x
v = y
tr.InverseTransform(&u, &v)
if bounds.Min.X <= int(u) && bounds.Max.X > int(u) && bounds.Min.Y <= int(v) && bounds.Max.Y > int(v) {
c1 = dest.At(int(x), int(y))
switch filter {
case LinearFilter:
c2 = src.At(int(u), int(v))
case BilinearFilter:
c2 = getColorBilinear(src, u, v)
case BicubicFilter:
c2 = getColorBicubic(src, u, v)
}
switch op {
case draw.Over:
r1, g1, b1, a1 = c1.RGBA()
r2, g2, b2, a2 = c2.RGBA()
ia = M - a2
r = ((r1 * ia) / M) + r2
g = ((g1 * ia) / M) + g2
b = ((b1 * ia) / M) + b2
a = ((a1 * ia) / M) + a2
color.R = uint8(r >> 8)
color.G = uint8(g >> 8)
color.B = uint8(b >> 8)
color.A = uint8(a >> 8)
cr = color
default:
cr = c2
}
dest.Set(int(x), int(y), cr)
}
}
}
}
func TestColor(t *testing.T) {
baseColor := color.RGBA{251, 252, 253, 254}
hex := ColorToHexString(baseColor)
n, _ := strconv.ParseInt(hex, 0, 64)
f64 := ColorToFloat64(baseColor)
if n != int64(f64) {
t.Fatal("Color convertion not equal ?")
}
recolor := Float64ToColor(f64)
r, g, b, _ := baseColor.RGBA()
rr, rg, rb, _ := recolor.RGBA()
if rr != r || rg != g || rb != b {
t.Fatal("Cant convert back to color !, ", rr, r, rg, g, rb, b)
}
}
//Takes a list of words (i.e. from a book), finds words that match the search term,
//and creates an image based on the usage of those words with each pixel representing
//the specified number of words (sectionSize). The channel will be sent a value of 1
//upon the successful completion of the task
func CreateImage(words []string, searchTerm string, sectionSize int, quit chan int) {
searchTerms := strings.Fields(searchTerm)
imageHeight := 20
//Setup the image
totalWords := len(words)
imageWidth := int(math.Ceil(float64(totalWords) / float64(sectionSize)))
newImg := image.NewRGBA(image.Rect(0, 0, imageWidth, imageHeight))
usedInSection := make([]bool, imageWidth, imageWidth)
usedCount := 0
for index, word := range words {
section := int(math.Floor(float64(index) / float64(sectionSize)))
for _, term := range searchTerms {
if word == term {
usedInSection[section] = true
usedCount++
break
}
}
}
fmt.Println("The terms", searchTerm, "were found", usedCount, "times")
for x := 0; x < imageWidth; x++ {
color := color.RGBA{255, 255, 255, 255}
if usedInSection[x] == true {
color.R = 0
color.G = 0
color.B = 0
}
for y := 0; y < imageHeight; y++ {
newImg.SetRGBA(x, y, color)
}
}
SaveImage(searchTerm+".png", newImg)
quit <- 1
}
// SetColor sets the fore color of the window.
func (win *window) SetColor(p sparta.Property, c color.RGBA) {
if (p != sparta.Background) && (p != sparta.Foreground) {
return
}
s := xwin.DefaultScreen()
code := getColorCode(c)
px, ok := pixelMap[code]
if !ok {
r, g, b, _ := c.RGBA()
cl, _ := xwin.AllocColor(s.DefaultColormap, uint16(r), uint16(g), uint16(b))
px = cl.Pixel
pixelMap[code] = px
}
if p == sparta.Foreground {
xwin.ChangeGC(win.gc, xgb.GCForeground, []uint32{px})
} else {
xwin.ChangeGC(win.gc, xgb.GCBackground, []uint32{px})
}
}
// linterp performs linear interpolation between the first (p[0]) and
// the last (pal[len(p) - 1]) colors in palette "pal". It fills the
// remaining (pal[1:len(p) - 1]) palette slots with the intepolated
// colors. Colors in slots pal[0] and pal[len(p) - 1] MUST be of type
// color.RGBA. The remaining slots will also be filled with colors of
// type color.RGBA
func linterp(pal color.Palette) {
n := len(pal)
if n <= 2 {
return
}
s, e := pal[0].(color.RGBA), pal[n-1].(color.RGBA)
dr := int(e.R) - int(s.R)
dg := int(e.G) - int(s.G)
db := int(e.B) - int(s.B)
da := int(e.A) - int(s.A)
for i := 1; i < n-1; i++ {
c := color.RGBA{}
c.R = uint8(int(s.R) + i*dr/(n-1))
c.G = uint8(int(s.G) + i*dg/(n-1))
c.B = uint8(int(s.B) + i*db/(n-1))
c.A = uint8(int(s.A) + i*da/(n-1))
pal[i] = c
}
}
// colorOpColor combines two colors with the requested operation
// applying appropriate overflows as Sass expects
func colorOpColor(tok token.Token, x, y *BasicLit, combine bool) (*BasicLit, error) {
colX, err := ColorFromHexString(x.Value)
if err != nil {
return nil, err
}
colY, err := ColorFromHexString(y.Value)
if err != nil {
return nil, err
}
var z color.RGBA
z.R = overflowMath(tok, colX.R, colY.R)
z.G = overflowMath(tok, colX.G, colY.G)
z.B = overflowMath(tok, colX.B, colY.B)
s := colorToHex(z)
return &BasicLit{
Kind: token.COLOR,
Value: LookupColor(s),
}, nil
}
// Compare compares a and b using binary comparison.
func (d *binary) Compare(a, b image.Image) (image.Image, int, error) {
ab, bb := a.Bounds(), b.Bounds()
w, h := ab.Dx(), ab.Dy()
if w != bb.Dx() || h != bb.Dy() {
return nil, -1, ErrSize
}
diff := image.NewNRGBA(image.Rect(0, 0, w, h))
n := 0
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
d := diffColor(a.At(ab.Min.X+x, ab.Min.Y+y), b.At(bb.Min.X+x, bb.Min.Y+y))
c := color.RGBA{0, 0, 0, 0xff}
if d > 0 {
c.R = 0xff
//c.A = uint8(100 + d*0xff/0xffff)
n++
}
diff.Set(x, y, c)
}
}
return diff, n, nil
}
func imgServingExample2(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
// prepare a rectangle
var p1, p2 image.Point
p1.X, p1.Y = 10, 10
p2.X, p2.Y = 400, 255
var rec image.Rectangle = image.Rectangle{Min: p1, Max: p2}
// prepare a line color
lineCol := color.RGBA{}
lineCol.R, lineCol.G, lineCol.B = 255, 44, 22
//lineCol.A = 0
c.Infof("brush color %#v \n", lineCol)
// create empty memory image - all pixels are 0 => black
imgRGBA := image.NewRGBA(rec)
for i := 20; i < 140; i++ {
lineCol.A = uint8(i)
imgRGBA.Set(i, i, lineCol)
imgRGBA.Set(i+1, i, lineCol)
imgRGBA.Set(i+2, i, lineCol)
imgRGBA.Set(i+3, i, lineCol)
imgRGBA.Set(i+3, i+1, lineCol)
}
w.Header().Set("Content-Type", "image/jpeg")
jpeg.Encode(w, imgRGBA, &jpeg.Options{Quality: jpeg.DefaultQuality})
}
func init_calc(x, y int) color.RGBA {
//t_ray ray
var x1, y1, z1 float32
var pixel color.RGBA
pixel.R = 255
pixel.A = 255
x1 = float32(D)
y1 = float32((WinX / 2) - x)
z1 = float32((WinY / 2) - y)
/*
ray.Vx = x1 - eye->pos.X;
ray.Vy = y1 - eye->pos.Y;
ray.Vz = z1 - eye->pos.Z;
ray.top_mesh = llist;
ray.top_spot = spot;
ray.bool = 1;
rotate_x(&ray.Vx, &ray.Vy, &ray.Vz, -eye->rot.X);
rotate_y(&ray.Vx, &ray.Vy, &ray.Vz, -eye->rot.Y);
rotate_z(&ray.Vx, &ray.Vy, &ray.Vz, -eye->rot.Z);
color = calc(eye, llist, spot, &ray);
*/
return pixel
}