func debarf_frame(frame *image.Paletted) error {
xmin := frame.Rect.Min.X
ymin := frame.Rect.Min.Y
xmax := frame.Rect.Max.X
ymax := frame.Rect.Max.Y
for y := ymin; y < ymax; y++ {
for x := xmin; x < xmax; x++ {
c := frame.At(x, y)
r, g, b, a := c.RGBA()
if pixel_is_transparent(frame, x, y) {
fmt.Printf("...")
frame.Set(x, y, color.RGBA64{uint16(r), uint16(g), uint16(b), 0xffff})
} else if should_turn_pixel_transparent(frame, x, y) {
fmt.Printf("xxx")
frame.Set(x, y, color.RGBA64{0, 0, 0, 0xffff})
} else {
r /= 0x1000
g /= 0x1000
b /= 0x1000
if a != 0xffff {
fmt.Printf("barf")
}
fmt.Printf("%x%x%x", r, g, b)
}
}
fmt.Printf("\n")
}
return nil
}
func (q *MedianCutQuantizer) Quantize(dst *image.Paletted, r image.Rectangle, src image.Image, sp image.Point) {
clip(dst, &r, src, &sp)
if r.Empty() {
return
}
points := make([]point, r.Dx()*r.Dy())
colorSet := make(map[uint32]color.Color, q.NumColor)
i := 0
for y := r.Min.Y; y < r.Max.Y; y++ {
for x := r.Min.X; x < r.Max.X; x++ {
c := src.At(x, y)
r, g, b, _ := c.RGBA()
colorSet[(r>>8)<<16|(g>>8)<<8|b>>8] = c
points[i][0] = int(r)
points[i][1] = int(g)
points[i][2] = int(b)
i++
}
}
if len(colorSet) <= q.NumColor {
// No need to quantize since the total number of colors
// fits within the palette.
dst.Palette = make(color.Palette, len(colorSet))
i := 0
for _, c := range colorSet {
dst.Palette[i] = c
i++
}
} else {
dst.Palette = q.medianCut(points)
}
for y := 0; y < r.Dy(); y++ {
for x := 0; x < r.Dx(); x++ {
// TODO: this should be done more efficiently.
dst.Set(sp.X+x, sp.Y+y, src.At(r.Min.X+x, r.Min.Y+y))
}
}
}