refactor: bindings

README.md

@@ -14,7 +14,7 @@ bimg was heavily inspired in [sharp](https://github.com/lovell/sharp), a great n
 ## Prerequisites
 
 - [libvips](https://github.com/jcupitt/libvips) v7.40.0+ (7.42.0+ recommended)
-- C++11 compatible compiler such as gcc 4.6+ or clang 3.0+
+- C compatible compiler such as gcc 4.6+ or clang 3.0+
 
 ## Installation
 

image.go

@@ -31,6 +31,14 @@ func (i *Image) Crop(width int, height int) ([]byte, error) {
 	return i.Process(options)
 }
 
+func (i *Image) Thumbnail(width int, height int) ([]byte, error) {
+	options := Options{
+		Width:  width,
+		Height: height,
+	}
+	return i.Process(options)
+}
+
 func (i *Image) Rotate(a Angle) ([]byte, error) {
 	options := Options{Rotate: a}
 	return i.Process(options)

metadata.go

@@ -6,8 +6,6 @@ package bimg
 */
 import "C"
 
-import ()
-
 type ImageSize struct {
 	Width  int
 	Height int
@@ -16,9 +14,10 @@ type ImageSize struct {
 type ImageMetadata struct {
 	Orientation int
 	Alpha       bool
+	Channels    int
 	Profile     bool
-	Space       int
 	Type        string
+	Space       string
 	Size        ImageSize
 }
 
@@ -43,12 +42,19 @@ func Metadata(buf []byte) (ImageMetadata, error) {
 	}
 	defer C.g_object_unref(C.gpointer(image))
 
+	size := ImageSize{
+		Width:  int(image.Xsize),
+		Height: int(image.Ysize),
+	}
+
 	metadata := ImageMetadata{
-		Type: getImageTypeName(imageType),
-		Size: ImageSize{
-			Width:  int(image.Xsize),
-			Height: int(image.Ysize),
-		},
+		Orientation: vipsExifOrientation(image),
+		Alpha:       vipsHasAlpha(image),
+		Profile:     vipsHasProfile(image),
+		Space:       vipsSpace(image),
+		Channels:    vipsImageBands(image),
+		Type:        getImageTypeName(imageType),
+		Size:        size,
 	}
 
 	return metadata, nil

resize.go

@@ -94,30 +94,17 @@ func Resize(buf []byte, o Options) ([]byte, error) {
 	debug("factor: %v, shrink: %v, residual: %v", factor, shrink, residual)
 
 	// Try to use libjpeg shrink-on-load
-	shrinkOnLoad := 1
 	if imageType == JPEG && shrink >= 2 {
-		switch {
-		case shrink >= 8:
-			factor = factor / 8
-			shrinkOnLoad = 8
-		case shrink >= 4:
-			factor = factor / 4
-			shrinkOnLoad = 4
-		case shrink >= 2:
-			factor = factor / 2
-			shrinkOnLoad = 2
+		// Recalculate integral shrink and double residual
+		tmpImage, factor, err := shrinkJpeg(buf, factor, shrink)
+		if err != nil {
+			return nil, err
 		}
-
-		if shrinkOnLoad > 1 {
-			// Recalculate integral shrink and double residual
+		if tmpImage != nil {
+			image = tmpImage
 			factor = math.Max(factor, 1.0)
 			shrink = int(math.Floor(factor))
 			residual = float64(shrink) / factor
-			// Reload input using shrink-on-load
-			image, err = vipsShrinkJpeg(buf, shrinkOnLoad)
-			if err != nil {
-				return nil, err
-			}
 		}
 	}
 
@@ -279,6 +266,33 @@ func calculateRotationAndFlip(image *C.struct__VipsImage, angle Angle) (Angle, b
 	return rotate, flip
 }
 
+func shrinkJpeg(buf []byte, factor float64, shrink int) (*C.struct__VipsImage, float64, error) {
+	shrinkOnLoad := 1
+
+	switch {
+	case shrink >= 8:
+		factor = factor / 8
+		shrinkOnLoad = 8
+	case shrink >= 4:
+		factor = factor / 4
+		shrinkOnLoad = 4
+	case shrink >= 2:
+		factor = factor / 2
+		shrinkOnLoad = 2
+	}
+
+	if shrinkOnLoad > 1 {
+		// Reload input using shrink-on-load
+		image, err := vipsShrinkJpeg(buf, shrinkOnLoad)
+		if err != nil {
+			return nil, factor, err
+		}
+		return image, factor, err
+	}
+
+	return nil, factor, nil
+}
+
 func calculateRotation(angle Angle) Angle {
 	divisor := angle % 90
 	if divisor != 0 {

vips.go

@@ -15,8 +15,8 @@ import (
 )
 
 var (
-	initialized bool = false
 	m           sync.Mutex
+	initialized bool = false
 )
 
 type vipsImage C.struct__VipsImage
@@ -31,7 +31,7 @@ func init() {
 
 	Initialize()
 
-	C.vips_concurrency_set(0)                   // single-thread
+	C.vips_concurrency_set(0)                   // default
 	C.vips_cache_set_max_mem(100 * 1024 * 1024) // 100 MB
 	C.vips_cache_set_max(500)                   // 500 operations
 }
@@ -49,10 +49,12 @@ func Initialize() {
 }
 
 func Shutdown() {
-	m.Lock()
-	defer m.Unlock()
-	C.vips_shutdown()
-	initialized = false
+	if initialized == true {
+		m.Lock()
+		defer m.Unlock()
+		C.vips_shutdown()
+		initialized = false
+	}
 }
 
 func vipsRotate(image *C.struct__VipsImage, angle Angle) (*C.struct__VipsImage, error) {
@@ -71,7 +73,7 @@ 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_custom(image, &out, C.int(direction))
+	err := C.vips_flip_bridge(image, &out, C.int(direction))
 	C.g_object_unref(C.gpointer(image))
 	if err != 0 {
 		return nil, catchVipsError()
@@ -105,7 +107,7 @@ func vipsRead(buf []byte) (*C.struct__VipsImage, ImageType, 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_custom(image, &buf, C.int(left), C.int(top), C.int(width), C.int(height))
+	err := C.vips_extract_area_bridge(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()
@@ -141,7 +143,7 @@ func vipsShrink(input *C.struct__VipsImage, shrink int) (*C.struct__VipsImage, e
 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))
+	err := C.vips_embed_bridge(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()
@@ -199,6 +201,26 @@ func vipsExifOrientation(image *C.struct__VipsImage) int {
 	return int(C.vips_exif_orientation(image))
 }
 
+func vipsHasAlpha(image *C.struct__VipsImage) bool {
+	return int(C.has_alpha_channel(image)) > 0
+}
+
+func vipsHasProfile(image *C.struct__VipsImage) bool {
+	return int(C.has_profile_embed(image)) > 0
+}
+
+func vipsWindowSize(name string) int {
+	return int(C.interpolator_window_size(C.CString(name)))
+}
+
+func vipsSpace(image *C.struct__VipsImage) string {
+	return C.GoString(C.vips_enum_nick_bridge(image))
+}
+
+func vipsImageBands(image *C.struct__VipsImage) int {
+	return int(C.vips_image_bands(image))
+}
+
 type vipsSaveOptions struct {
 	Quality     int
 	Compression int
@@ -212,13 +234,13 @@ func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
 
 	switch {
 	case o.Type == PNG:
-		err = C.vips_pngsave_custom(image, &ptr, &length, 1, C.int(o.Compression), C.int(o.Quality), 0)
+		err = C.vips_pngsave_bridge(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)
+		err = C.vips_webpsave_bridge(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)
+		err = C.vips_jpegsave_bridge(image, &ptr, &length, 1, C.int(o.Quality), 0)
 		break
 	}
 

vips.h

@@ -30,7 +30,7 @@ vips_jpegload_buffer_shrink(void *buf, size_t len, VipsImage **out, int shrink)
 };
 
 int
-vips_flip_custom(VipsImage *in, VipsImage **out, int direction)
+vips_flip_bridge(VipsImage *in, VipsImage **out, int direction)
 {
 	return vips_flip(in, out, direction, NULL);
 };
@@ -71,31 +71,63 @@ vips_exif_orientation(VipsImage *image) {
 };
 
 int
-vips_embed_custom(VipsImage *in, VipsImage **out, int left, int top, int width, int height, int extend)
+has_profile_embed(VipsImage *image) {
+	return (vips_image_get_typeof(image, VIPS_META_ICC_NAME) > 0) ? 1 : 0;
+};
+
+int
+has_alpha_channel(VipsImage *image) {
+	return (
+    (image->Bands == 2 && image->Type == VIPS_INTERPRETATION_B_W) ||
+    (image->Bands == 4 && image->Type != VIPS_INTERPRETATION_CMYK) ||
+    (image->Bands == 5 && image->Type == VIPS_INTERPRETATION_CMYK)
+  ) ? 1 : 0;
+};
+
+int
+interpolator_window_size(char const *name) {
+  VipsInterpolate *interpolator = vips_interpolate_new(name);
+  int window_size = vips_interpolate_get_window_size(interpolator);
+  g_object_unref(interpolator);
+  return window_size;
+};
+
+const char *
+vips_enum_nick_bridge(VipsImage *image) {
+	return vips_enum_nick(VIPS_TYPE_INTERPRETATION, image->Type);
+};
+
+int
+vips_image_bands(VipsImage *image) {
+	return image->Bands;
+};
+
+int
+vips_embed_bridge(VipsImage *in, VipsImage **out, int left, int top, int width, int height, int extend)
 {
 	return vips_embed(in, out, left, top, width, height, "extend", extend, NULL);
 };
 
 int
-vips_colourspace_custom(VipsImage *in, VipsImage **out, VipsInterpretation space)
+vips_colourspace_bridge(VipsImage *in, VipsImage **out, VipsInterpretation space)
 {
 	return vips_colourspace(in, out, space, NULL);
 };
 
 int
-vips_extract_area_custom(VipsImage *in, VipsImage **out, int left, int top, int width, int height)
+vips_extract_area_bridge(VipsImage *in, VipsImage **out, int left, int top, int width, int height)
 {
 	return vips_extract_area(in, out, left, top, width, height, NULL);
 };
 
 int
-vips_jpegsave_custom(VipsImage *in, void **buf, size_t *len, int strip, int quality, int interlace)
+vips_jpegsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int quality, int interlace)
 {
 	return vips_jpegsave_buffer(in, buf, len, "strip", strip, "Q", quality, "optimize_coding", TRUE, "interlace", interlace, NULL);
 };
 
 int
-vips_pngsave_custom(VipsImage *in, void **buf, size_t *len, int strip, int compression, int quality, int interlace)
+vips_pngsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int compression, int quality, int interlace)
 {
 #if (VIPS_MAJOR_VERSION >= 8 || (VIPS_MAJOR_VERSION >= 7 && VIPS_MINOR_VERSION >= 42))
   return vips_pngsave_buffer(in, buf, len, "strip", FALSE, "compression", compression,
@@ -107,7 +139,7 @@ vips_pngsave_custom(VipsImage *in, void **buf, size_t *len, int strip, int compr
 };
 
 int
-vips_webpsave_custom(VipsImage *in, void **buf, size_t *len, int strip, int quality, int interlace)
+vips_webpsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int quality, int interlace)
 {
 	return vips_webpsave_buffer(in, buf, len, "strip", strip, "Q", quality, "optimize_coding", TRUE, "interlace", interlace, NULL);
 };