func (p *gdImage) gdCopyResized(dstX, dstY, srcX, srcY, dstW, dstH, srcW, srcH int) *gdImage {
if p == nil || p.img == nil {
panic(imageError)
}
dst := gdCreate(dstW, dstH)
if dst == nil {
return nil
}
transparency := C.gdImageColorAllocateAlpha(dst.img, 255, 255, 255, 127)
C.gdImageFilledRectangle(dst.img, C.int(dstX), C.int(dstY), C.int(dstW), C.int(dstH), transparency)
C.gdImageColorTransparent(dst.img, transparency)
C.gdImageCopyResized(dst.img, p.img, C.int(dstX), C.int(dstY), C.int(srcX), C.int(srcY),
C.int(dstW), C.int(dstH), C.int(srcW), C.int(srcH))
if isInvalid(dst) {
dst.gdDestroy()
return nil
}
return dst
}
func (p *Image) ColorAllocateAlpha(r, g, b, a int) Color {
return (Color)(C.gdImageColorAllocateAlpha(p.img, C.int(r), C.int(g), C.int(b), C.int(a)))
}