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feat: support resize and enlarge images

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This commit is contained in:
Tomas Aparicio 2015-04-06 02:04:10 +02:00
parent 37dd5f1d27
commit b20ddbb8f3
4 changed files with 212 additions and 33 deletions
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65
vips.go
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@ -19,13 +19,17 @@ func init() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
if C.VIPS_MAJOR_VERSION <= 7 && C.VIPS_MINOR_VERSION < 40 {
panic("unsupported old vips version")
}
err := C.vips_init(C.CString("bimg"))
if err != 0 {
C.vips_shutdown()
panic("unable to start vips!")
}
C.vips_concurrency_set(1) // default
C.vips_concurrency_set(1) // single-thread
C.vips_cache_set_max_mem(100 * 1024 * 1024) // 100 MB
C.vips_cache_set_max(500) // 500 operations
}
@ -50,7 +54,7 @@ func vipsRotate(image *C.struct__VipsImage, angle Angle) (*C.struct__VipsImage,
func vipsFlip(image *C.struct__VipsImage, direction Direction) (*C.struct__VipsImage, error) {
var out *C.struct__VipsImage
err := C.vips_flip_seq(image, &out)
err := C.vips_flip_custom(image, &out, C.int(direction))
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, catchVipsError()
@ -81,10 +85,10 @@ func vipsRead(buf []byte) (*C.struct__VipsImage, ImageType, error) {
return image, imageType, nil
}
func vipsExtract(image *C.struct__VipsImage, left int, top int, width int, height int) (*C.struct__VipsImage, error) {
func vipsExtract(image *C.struct__VipsImage, left, top, width, height int) (*C.struct__VipsImage, error) {
var buf *C.struct__VipsImage
err := C.vips_extract_area_0(image, &buf, C.int(left), C.int(top), C.int(width), C.int(height))
err := C.vips_extract_area_custom(image, &buf, C.int(left), C.int(top), C.int(width), C.int(height))
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, catchVipsError()
@ -93,6 +97,59 @@ func vipsExtract(image *C.struct__VipsImage, left int, top int, width int, heigh
return buf, nil
}
func vipsShrinkJpeg(buf []byte, shrink int) (*C.struct__VipsImage, error) {
var image *C.struct__VipsImage
err := C.vips_jpegload_buffer_shrink(unsafe.Pointer(&buf[0]), C.size_t(len(buf)), &image, C.int(shrink))
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func vipsShrink(input *C.struct__VipsImage, shrink int) (*C.struct__VipsImage, error) {
var image *C.struct__VipsImage
err := C.vips_shrink_0(input, &image, C.double(float64(shrink)), C.double(float64(shrink)))
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func vipsEmbed(input *C.struct__VipsImage, left, top, width, height, extend int) (*C.struct__VipsImage, error) {
var image *C.struct__VipsImage
err := C.vips_embed_custom(input, &image, C.int(left), C.int(top), C.int(width), C.int(height), C.int(extend))
C.g_object_unref(C.gpointer(image))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func vipsAffine(input *C.struct__VipsImage, residual float64, i Interpolator) (*C.struct__VipsImage, error) {
var image *C.struct__VipsImage
istring := C.CString(i.String())
interpolator := C.vips_interpolate_new(istring)
// Perform affine transformation
err := C.vips_affine_interpolator(input, &image, C.double(residual), 0, 0, C.double(residual), interpolator)
C.g_object_unref(C.gpointer(image))
C.free(unsafe.Pointer(istring))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func vipsImageType(buf []byte) ImageType {
imageType := UNKNOWN