schobers/allg5
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fixed bug with negative pitch.

Browse Source
This commit is contained in:
Sander Schobers 2020-05-12 21:03:50 +02:00
parent 14a0614ced
commit 5559f34621
1 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
bitmap.go
View File

@ -231,12 +231,23 @@ func (b *Bitmap) Image() image.Image {
return nil
}
defer C.al_unlock_bitmap(b.bitmap)
src := (*[1 << 30]uint8)(region.data)
dst := im.Pix
pitch := int(region.pitch)
length := b.height * pitch
data := uintptr(region.data)
var srcOff, dstOff int
if pitch < 0 {
srcOff = (b.height - 1) * -pitch
length *= -1
data = data - uintptr(srcOff)
}
rowLength := b.width * 4
src := (*[1 << 28]uint8)(unsafe.Pointer(data))[:length:length]
dst := im.Pix
for y := 0; y < b.height; y++ {
copy(dst[dstOff:], src[srcOff:srcOff+b.width*4])
srcOff += int(region.pitch)
copy(dst[dstOff:], src[srcOff:srcOff+rowLength])
srcOff += pitch
dstOff += im.Stride
}
return im