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feat(#3, #5): support image operations

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This commit is contained in:
Tomas Aparicio 2015-03-30 02:41:16 +02:00
parent 63f4b01c8d
commit 61997bc68b
7 changed files with 107 additions and 53 deletions
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44
vips.go
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@ -9,6 +9,7 @@ import "C"
import (
"errors"
"runtime"
"strings"
"unsafe"
)
@ -44,9 +45,24 @@ func vipsRotate(image *C.struct__VipsImage, degrees int) (*C.struct__VipsImage,
return out, nil
}
func vipsFlip(image *C.struct__VipsImage, direction Direction) (*C.struct__VipsImage, error) {
var out *C.struct__VipsImage
err := C.vips_flip_seq(image, &out)
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, vipsError()
}
defer C.g_object_unref(C.gpointer(out))
return out, nil
}
func vipsRead(buf []byte) (*C.struct__VipsImage, error) {
var image *C.struct__VipsImage
debug("Format: %s", vipsImageType(buf))
// feed it
length := C.size_t(len(buf))
imageBuf := unsafe.Pointer(&buf[0])
@ -75,6 +91,34 @@ type vipsSaveOptions struct {
Quality int
}
func vipsImageType(buf []byte) string {
imageType := UNKNOWN
length := C.size_t(len(buf))
imageBuf := unsafe.Pointer(&buf[0])
bufferType := C.GoString(C.vips_foreign_find_load_buffer(imageBuf, length))
switch {
case strings.HasSuffix(bufferType, "JpegBuffer"):
imageType = JPEG
break
case strings.HasSuffix(bufferType, "PngBuffer"):
imageType = PNG
break
case strings.HasSuffix(bufferType, "TiffBuffer"):
imageType = TIFF
break
case strings.HasSuffix(bufferType, "WebpBuffer"):
imageType = WEBP
break
case strings.HasSuffix(bufferType, "MagickBuffer"):
imageType = MAGICK
break
}
return imageType
}
func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
var ptr unsafe.Pointer
length := C.size_t(0)