func ImageToJpegBuffer(p *Image, quality int) []byte {
var imgSize int
pimgSize := (*C.int)(Pointer(&imgSize))
buf := C.gdImageJpegPtr(p.img, pimgSize, C.int(quality))
defer C.gdFree(buf)
return C.GoBytes(buf, *pimgSize)
}
func (p *gdImage) gdImageJpeg() ([]byte, error) {
if p == nil {
panic(imageError)
}
var size C.int
// use -1 as quality, this will mean to use standard Jpeg quality
data := C.gdImageJpegPtr(p.img, &size, 92)
if data == nil || int(size) == 0 {
return []byte{}, writeError
}
defer C.gdFree(unsafe.Pointer(data))
return C.GoBytes(data, size), nil
}