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screenshot: flip bits for RGB888

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This commit is contained in:
bbedward
2025-12-08 15:38:49 -05:00
parent d864094f48
commit c21d777269
4 changed files with 57 additions and 9 deletions
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22
core/internal/wayland/shm/buffer.go
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@@ -109,7 +109,11 @@ func (b *Buffer) ConvertTo32Bit(srcFormat PixelFormat) (*Buffer, PixelFormat, er
srcData := b.data
dstData := dst.data
isRGB := srcFormat == FormatRGB888
// DRM format names are counterintuitive on little-endian:
// RGB888 memory layout: B, G, R (name is logical order, not memory)
// BGR888 memory layout: R, G, B
isBGRMemory := srcFormat == FormatRGB888
for y := 0; y < b.Height; y++ {
srcRow := y * b.Stride
@@ -117,14 +121,16 @@ func (b *Buffer) ConvertTo32Bit(srcFormat PixelFormat) (*Buffer, PixelFormat, er
for x := 0; x < b.Width; x++ {
si := srcRow + x*3
di := dstRow + x*4
if isRGB {
dstData[di+0] = srcData[si+2] // B
dstData[di+1] = srcData[si+1] // G
dstData[di+2] = srcData[si+0] // R
if isBGRMemory {
// RGB888: src memory is B,G,R -> dst XRGB8888 memory B,G,R,X
dstData[di+0] = srcData[si+0]
dstData[di+1] = srcData[si+1]
dstData[di+2] = srcData[si+2]
} else {
dstData[di+0] = srcData[si+0] // B
dstData[di+1] = srcData[si+1] // G
dstData[di+2] = srcData[si+2] // R
// BGR888: src memory is R,G,B -> dst XRGB8888 memory B,G,R,X
dstData[di+0] = srcData[si+2]
dstData[di+1] = srcData[si+1]
dstData[di+2] = srcData[si+0]
}
dstData[di+3] = 0xFF
}