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Wire up pasting to RGB

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This commit is contained in:
Kovid Goyal 2023-01-02 16:29:14 +05:30
parent d192dcb0d7
commit f9feb4954a
No known key found for this signature in database
GPG Key ID: 06BC317B515ACE7C
2 changed files with 33 additions and 8 deletions
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13
tools/utils/images/to_rgb.go
View File

@ -148,6 +148,9 @@ type scanner_rgb struct {
opaque_base_uint []uint8
}
func (s scanner_rgb) bytes_per_pixel() int { return 3 }
func (s scanner_rgb) bounds() image.Rectangle { return s.image.Bounds() }
func blend(dest []uint8, base []float64, r, g, b, a uint8) {
alpha := float64(a) / 255.0
dest[0] = uint8(alpha*float64(r) + (1.0-alpha)*base[0])
@ -395,3 +398,13 @@ func (s *scanner_rgb) scan(x1, y1, x2, y2 int, dst []uint8) {
}
}
}
func paste_nrgb_onto_opaque(background *image.NRGBA, img image.Image, pos image.Point, bgcol *NRGBColor) {
bg := NRGBColor{}
if bgcol != nil {
bg = *bgcol
}
src := newScannerRGB(img, bg)
run_paste(src, background, pos, func(dst []byte) {})
}

28
tools/utils/images/to_rgba.go
View File

@ -48,6 +48,9 @@ type scanner struct {
palette []color.NRGBA
}
func (s scanner) bytes_per_pixel() int { return 4 }
func (s scanner) bounds() image.Rectangle { return s.image.Bounds() }
func newScanner(img image.Image) *scanner {
s := &scanner{
image: img,
@ -321,14 +324,20 @@ func (s *scanner) scan(x1, y1, x2, y2 int, dst []uint8) {
}
}
func run_paste(bytes_per_pixel int, background *image.NRGBA, img image.Image, pos image.Point, postprocess func([]byte)) {
type Scanner interface {
scan(x1, y1, x2, y2 int, dst []uint8)
bytes_per_pixel() int
bounds() image.Rectangle
}
func run_paste(src Scanner, background *image.NRGBA, pos image.Point, postprocess func([]byte)) {
pos = pos.Sub(background.Bounds().Min)
pasteRect := image.Rectangle{Min: pos, Max: pos.Add(img.Bounds().Size())}
pasteRect := image.Rectangle{Min: pos, Max: pos.Add(src.bounds().Size())}
interRect := pasteRect.Intersect(background.Bounds())
if interRect.Empty() {
return
}
src := newScanner(img)
bytes_per_pixel := src.bytes_per_pixel()
parallel(interRect.Min.Y, interRect.Max.Y, func(ys <-chan int) {
for y := range ys {
x1 := interRect.Min.X - pasteRect.Min.X
@ -345,13 +354,14 @@ func run_paste(bytes_per_pixel int, background *image.NRGBA, img image.Image, po
}
func paste_nrgba_onto_opaque(background *image.NRGBA, img image.Image, pos image.Point, bgcol *color.NRGBA) {
func paste_nrgba_onto_opaque(background *image.NRGBA, img image.Image, pos image.Point, bgcol *NRGBColor) {
src := newScanner(img)
if bgcol == nil {
run_paste(4, background, img, pos, func([]byte) {})
run_paste(src, background, pos, func([]byte) {})
return
}
bg := [3]float64{float64(bgcol.R), float64(bgcol.G), float64(bgcol.B)}
run_paste(4, background, img, pos, func(dst []byte) {
run_paste(src, background, pos, func(dst []byte) {
for len(dst) > 0 {
a := float64(dst[3]) / 255.0
for i := range dst[:3] {
@ -366,17 +376,19 @@ func paste_nrgba_onto_opaque(background *image.NRGBA, img image.Image, pos image
}
// Paste pastes the img image to the background image at the specified position. Optionally composing onto the specified opaque color.
func Paste(background image.Image, img image.Image, pos image.Point, opaque_bg *color.NRGBA) {
func Paste(background image.Image, img image.Image, pos image.Point, opaque_bg *NRGBColor) {
switch background.(type) {
case *image.NRGBA:
paste_nrgba_onto_opaque(background.(*image.NRGBA), img, pos, opaque_bg)
case *NRGB:
paste_nrgb_onto_opaque(background.(*image.NRGBA), img, pos, opaque_bg)
default:
panic("Unsupported background image type")
}
}
// PasteCenter pastes the img image to the center of the background image. Optionally composing onto the specified opaque color.
func PasteCenter(background image.Image, img image.Image, opaque_bg *color.NRGBA) {
func PasteCenter(background image.Image, img image.Image, opaque_bg *NRGBColor) {
bgBounds := background.Bounds()
bgW := bgBounds.Dx()
bgH := bgBounds.Dy()