diff options
Diffstat (limited to 'area.go')
| -rw-r--r-- | area.go | 14 |
1 files changed, 9 insertions, 5 deletions
@@ -7,6 +7,7 @@ import ( "sync" "image" "unsafe" + "reflect" ) // Area represents a blank canvas upon which programs may draw anything and receive arbitrary events from the user. @@ -339,10 +340,14 @@ func pixelData(img *image.RGBA) *uint8 { // some platforms require pixels in ARGB order in their native endianness (because they treat the pixel array as an array of uint32s) // this does the conversion -// s stores the slice used to avoid frequent memory allocations -func toARGB(i *image.RGBA, s *sysData) *byte { - // TODO actually store realBits in s - realbits := make([]byte, 4 * i.Rect.Dx() * i.Rect.Dy()) +// you need to convert somewhere; this memory is assumed to have a stride equal to the pixels per scanline (Windows gives us memory to use; other platforms we'll see) +func toARGB(i *image.RGBA, memory uintptr) { + var realbits []byte + + rbs := (*reflect.SliceHeader)(unsafe.Pointer(&realbits)) + rbs.Data = memory + rbs.Len = 4 * i.Rect.Dx() * i.Rect.Dy() + rbs.Cap = rbs.Len p := pixelDataPos(i) q := 0 for y := i.Rect.Min.Y; y < i.Rect.Max.Y; y++ { @@ -363,5 +368,4 @@ func toARGB(i *image.RGBA, s *sysData) *byte { } p = nextp } - return &realbits[0] } |