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-rw-r--r--prototypes/xgb-image.go97
1 files changed, 71 insertions, 26 deletions
diff --git a/prototypes/xgb-image.go b/prototypes/xgb-image.go
index fce0ab1..c6ab02c 100644
--- a/prototypes/xgb-image.go
+++ b/prototypes/xgb-image.go
@@ -14,6 +14,7 @@ import (
"github.com/BurntSushi/xgb/xproto"
"image"
+ "image/color"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
@@ -26,6 +27,47 @@ import "C"
func F64ToFixed(f float64) render.Fixed { return render.Fixed(f * 65536) }
func FixedToF64(f render.Fixed) float64 { return float64(f) / 65536 }
+var formats = map[byte]struct {
+ format render.Directformat
+ transform func(color.Color) uint32
+}{
+ 32: {
+ format: render.Directformat{
+ RedShift: 16,
+ RedMask: 0xff,
+ GreenShift: 8,
+ GreenMask: 0xff,
+ BlueShift: 0,
+ BlueMask: 0xff,
+ AlphaShift: 24,
+ AlphaMask: 0xff,
+ },
+ transform: func(color color.Color) uint32 {
+ r, g, b, a := color.RGBA()
+ return (a>>8)<<24 | (r>>8)<<16 | (g>>8)<<8 | (b >> 8)
+ },
+ },
+ 30: {
+ /*
+ // Alpha makes compositing unbearably slow.
+ AlphaShift: 30,
+ AlphaMask: 0x3,
+ */
+ format: render.Directformat{
+ RedShift: 20,
+ RedMask: 0x3ff,
+ GreenShift: 10,
+ GreenMask: 0x3ff,
+ BlueShift: 0,
+ BlueMask: 0x3ff,
+ },
+ transform: func(color color.Color) uint32 {
+ r, g, b, a := color.RGBA()
+ return (a>>14)<<30 | (r>>6)<<20 | (g>>6)<<10 | (b >> 6)
+ },
+ },
+}
+
func main() {
/*
pf, err := os.Create("pprof.out")
@@ -63,18 +105,35 @@ func main() {
screen := setup.DefaultScreen(X)
visual, depth := screen.RootVisual, screen.RootDepth
- // TODO: We should check that we find it, though we don't /need/ alpha here,
- // it's just a minor improvement--affects the backpixel value.
+
+ // Only go for 10-bit when the picture can make use of that range.
+ prefer30 := false
+ switch img.(type) {
+ case *image.Gray16, *image.RGBA64, *image.NRGBA64:
+ prefer30 = true
+ }
+
+ // XXX: We don't /need/ alpha here, it's just a minor improvement--affects
+ // the backpixel value. (And we reject it in 30-bit depth anyway.)
for _, i := range screen.AllowedDepths {
for _, v := range i.Visuals {
// TODO: Could/should check other parameters.
- if i.Depth == 32 && v.Class == xproto.VisualClassTrueColor {
+ if v.Class != xproto.VisualClassTrueColor {
+ continue
+ }
+ if prefer30 && i.Depth == 30 ||
+ !prefer30 && i.Depth == 32 {
visual, depth = v.VisualId, i.Depth
break
}
}
}
+ format, ok := formats[depth]
+ if !ok {
+ log.Fatalln("unsupported bit depth")
+ }
+
mid, err := xproto.NewColormapId(X)
if err != nil {
log.Fatalln(err)
@@ -92,7 +151,7 @@ func main() {
_ = xproto.CreateWindow(X, depth, wid, screen.Root,
0, 0, 500, 500, 0, xproto.WindowClassInputOutput,
visual, xproto.CwBackPixel|xproto.CwBorderPixel|xproto.CwEventMask|
- xproto.CwColormap, []uint32{0x80808080, 0,
+ xproto.CwColormap, []uint32{format.transform(color.Alpha{0x80}), 0,
xproto.EventMaskStructureNotify | xproto.EventMaskExposure,
uint32(mid)})
@@ -132,7 +191,7 @@ func main() {
// setup.BitmapFormatScanline{Pad,Unit} and setup.BitmapFormatBitOrder
// don't interest us here since we're only using Z format pixmaps.
for _, pf := range setup.PixmapFormats {
- if pf.Depth == 32 {
+ if pf.Depth == depth {
if pf.BitsPerPixel != 32 || pf.ScanlinePad != 32 {
log.Fatalln("unsuported X server")
}
@@ -143,28 +202,18 @@ func main() {
if err != nil {
log.Fatalln(err)
}
- _ = xproto.CreatePixmap(X, 32, pixid, xproto.Drawable(screen.Root),
+ _ = xproto.CreatePixmap(X, depth, pixid, xproto.Drawable(screen.Root),
uint16(img.Bounds().Dx()), uint16(img.Bounds().Dy()))
var bgraFormat render.Pictformat
- wanted := render.Directformat{
- RedShift: 16,
- RedMask: 0xff,
- GreenShift: 8,
- GreenMask: 0xff,
- BlueShift: 0,
- BlueMask: 0xff,
- AlphaShift: 24,
- AlphaMask: 0xff,
- }
for _, pf := range pformats.Formats {
- if pf.Depth == 32 && pf.Direct == wanted {
+ if pf.Depth == depth && pf.Direct == format.format {
bgraFormat = pf.Id
break
}
}
if bgraFormat == 0 {
- log.Fatalln("ARGB format not found")
+ log.Fatalln("picture format not found")
}
// We could also look for the inverse pictformat.
@@ -202,14 +251,12 @@ func main() {
row := make([]byte, bounds.Dx()*4)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
- r, g, b, a := img.At(x, y).RGBA()
- encoding.PutUint32(row[x*4:],
- (a>>8)<<24|(r>>8)<<16|(g>>8)<<8|(b>>8))
+ encoding.PutUint32(row[x*4:], format.transform(img.At(x, y)))
}
_ = xproto.PutImage(X, xproto.ImageFormatZPixmap,
xproto.Drawable(pixid), cid, uint16(bounds.Dx()), 1,
0, int16(y),
- 0, 32, row)
+ 0, depth, row)
}
} else {
rep, err := shm.QueryVersion(X).Reply()
@@ -242,9 +289,7 @@ func main() {
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
row := data[y*bounds.Dx()*4:]
for x := bounds.Min.X; x < bounds.Max.X; x++ {
- r, g, b, a := img.At(x, y).RGBA()
- encoding.PutUint32(row[x*4:],
- (a>>8)<<24|(r>>8)<<16|(g>>8)<<8|(b>>8))
+ encoding.PutUint32(row[x*4:], format.transform(img.At(x, y)))
}
}
@@ -262,7 +307,7 @@ func main() {
_ = shm.PutImage(X, xproto.Drawable(pixid), cid,
uint16(bounds.Dx()), uint16(bounds.Dy()), 0, 0,
uint16(bounds.Dx()), uint16(bounds.Dy()), 0, 0,
- 32, xproto.ImageFormatZPixmap,
+ depth, xproto.ImageFormatZPixmap,
0 /* SendEvent */, segid, 0 /* Offset */)
}