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feat: support multiple outputs

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This commit is contained in:
Tomas Aparicio 2015-04-05 23:39:15 +02:00
parent d471c49348
commit ef10d7d7ec
9 changed files with 220 additions and 58 deletions
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30
vips.go
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@ -60,12 +60,12 @@ func vipsFlip(image *C.struct__VipsImage, direction Direction) (*C.struct__VipsI
return out, nil
}
func vipsRead(buf []byte) (*C.struct__VipsImage, error) {
func vipsRead(buf []byte) (*C.struct__VipsImage, ImageType, error) {
var image *C.struct__VipsImage
imageType := vipsImageType(buf)
if imageType == UNKNOWN {
return nil, errors.New("Input buffer contains unsupported image format")
return nil, UNKNOWN, errors.New("Input buffer contains unsupported image format")
}
// feed it
@ -75,10 +75,10 @@ func vipsRead(buf []byte) (*C.struct__VipsImage, error) {
err := C.vips_init_image(imageBuf, length, imageTypeC, &image)
if err != 0 {
return nil, catchVipsError()
return nil, UNKNOWN, catchVipsError()
}
return image, nil
return image, imageType, nil
}
func vipsExtract(image *C.struct__VipsImage, left int, top int, width int, height int) (*C.struct__VipsImage, error) {
@ -93,7 +93,7 @@ func vipsExtract(image *C.struct__VipsImage, left int, top int, width int, heigh
return buf, nil
}
func vipsImageType(buf []byte) int {
func vipsImageType(buf []byte) ImageType {
imageType := UNKNOWN
length := C.size_t(len(buf))
@ -126,18 +126,32 @@ func vipsExifOrientation(image *C.struct__VipsImage) int {
}
type vipsSaveOptions struct {
Quality int
Quality int
Compression int
Type ImageType
}
func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
var ptr unsafe.Pointer
length := C.size_t(0)
err := C.int(0)
err := C.vips_jpegsave_custom(image, &ptr, &length, 1, C.int(o.Quality), 0)
switch {
case o.Type == PNG:
err = C.vips_pngsave_custom(image, &ptr, &length, 1, C.int(o.Compression), C.int(o.Quality), 0)
break
case o.Type == WEBP:
err = C.vips_webpsave_custom(image, &ptr, &length, 1, C.int(o.Quality), 0)
break
default:
err = C.vips_jpegsave_custom(image, &ptr, &length, 1, C.int(o.Quality), 0)
break
}
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, catchVipsError()
}
C.g_object_unref(C.gpointer(image))
buf := C.GoBytes(ptr, C.int(length))
// cleanup