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xgb-render: give up on composite alpha

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This commit is contained in:
Přemysl Eric Janouch 2018-08-23 04:19:28 +02:00
parent 9424579c75
commit 23586eae01
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 8 additions and 10 deletions
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18
prototypes/xgb-xrender.go
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@ -234,13 +234,10 @@ func main() {
bounds := f.Bounds(fixed.Int26_6(opts.Size * float64(opts.DPI) *
(64.0 / 72.0)))
var rgbFormat render.Pictformat
var alphaFormat render.Pictformat
for _, pf := range pformats.Formats {
// Hopefully. Might want to check ARGB/BGRA.
if pf.Depth == 32 && pf.Direct.AlphaMask != 0 {
rgbFormat = pf.Id
log.Printf("%+v\n", pf)
break
if pf.Depth == 8 && pf.Direct.AlphaMask == 0xff {
alphaFormat = pf.Id
}
}
@ -250,11 +247,12 @@ func main() {
}
// NOTE: A depth of 24 will not work, the server always rejects it.
_ = render.CreateGlyphSet(X, gsid, rgbFormat)
// Composite alpha doesn't make sense since golang/freetype can't use it.
_ = render.CreateGlyphSet(X, gsid, alphaFormat)
// TODO: Seems like we want to use NRGBA. Or RGBA if the A is always 1.
// Or implement our own image.Image for direct gamma-corrected RGB!
nrgb := image.NewRGBA(image.Rect(
// NOTE: We could do gamma post-correction in higher precision if we
// implemented our own clone of the image.Image implementation.
nrgb := image.NewGray(image.Rect(
+bounds.Min.X.Floor(),
-bounds.Min.Y.Floor(),
+bounds.Max.X.Ceil(),