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* Copyright 2008 The Android Open Source Project
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "SkTypes.h"
#if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
#include "SkBitmap.h"
#include "SkCGUtils.h"
#include "SkColorPriv.h"
#include "SkData.h"
#include "SkImageEncoder.h"
#include "SkStream.h"
#include "SkStreamPriv.h"
#include "SkTemplates.h"
#include "SkUnPreMultiply.h"
#include <ApplicationServices/ApplicationServices.h>
#include <CoreGraphics/CoreGraphics.h>
#include <ImageIO/ImageIO.h>
#include <MobileCoreServices/MobileCoreServices.h>
static size_t consumer_put(void* info, const void* buffer, size_t count) {
SkWStream* stream = reinterpret_cast<SkWStream*>(info);
return stream->write(buffer, count) ? count : 0;
static void consumer_release(void* info) {
// we do nothing, since by design we don't "own" the stream (i.e. info)
static CGDataConsumerRef SkStreamToCGDataConsumer(SkWStream* stream) {
CGDataConsumerCallbacks procs;
procs.putBytes = consumer_put;
procs.releaseConsumer = consumer_release;
// we don't own/reference the stream, so it our consumer must not live
// longer that our caller's ownership of the stream
return CGDataConsumerCreate(stream, &procs);
static CGImageDestinationRef SkStreamToImageDestination(SkWStream* stream,
CFStringRef type) {
CGDataConsumerRef consumer = SkStreamToCGDataConsumer(stream);
if (nullptr == consumer) {
return nullptr;
SkAutoTCallVProc<const void, CFRelease> arconsumer(consumer);
return CGImageDestinationCreateWithDataConsumer(consumer, type, 1, nullptr);
class SkImageEncoder_CG : public SkImageEncoder {
SkImageEncoder_CG(Type t) : fType(t) {}
virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality);
Type fType;
/* Encode bitmaps via CGImageDestination. We setup a DataConsumer which writes
to our SkWStream. Since we don't reference/own the SkWStream, our consumer
must only live for the duration of the onEncode() method.
bool SkImageEncoder_CG::onEncode(SkWStream* stream, const SkBitmap& bm,
int quality) {
// Used for converting a bitmap to 8888.
const SkBitmap* bmPtr = &bm;
SkBitmap bitmap8888;
CFStringRef type;
switch (fType) {
case kICO_Type:
type = kUTTypeICO;
case kBMP_Type:
type = kUTTypeBMP;
case kGIF_Type:
type = kUTTypeGIF;
case kJPEG_Type:
type = kUTTypeJPEG;
case kPNG_Type:
// PNG encoding an ARGB_4444 bitmap gives the following errors in GM:
// <Error>: CGImageDestinationAddImage image could not be converted to destination
// format.
// <Error>: CGImageDestinationFinalize image destination does not have enough images
// So instead we copy to 8888.
if (bm.colorType() == kARGB_4444_SkColorType) {
bm.copyTo(&bitmap8888, kN32_SkColorType);
bmPtr = &bitmap8888;
type = kUTTypePNG;
return false;
CGImageDestinationRef dst = SkStreamToImageDestination(stream, type);
if (nullptr == dst) {
return false;
SkAutoTCallVProc<const void, CFRelease> ardst(dst);
CGImageRef image = SkCreateCGImageRef(*bmPtr);
if (nullptr == image) {
return false;
SkAutoTCallVProc<CGImage, CGImageRelease> agimage(image);
CGImageDestinationAddImage(dst, image, nullptr);
return CGImageDestinationFinalize(dst);
static SkImageEncoder* sk_imageencoder_cg_factory(SkImageEncoder::Type t) {
switch (t) {
case SkImageEncoder::kICO_Type:
case SkImageEncoder::kBMP_Type:
case SkImageEncoder::kGIF_Type:
case SkImageEncoder::kJPEG_Type:
case SkImageEncoder::kPNG_Type:
return nullptr;
return new SkImageEncoder_CG(t);
static SkImageEncoder_EncodeReg gEReg(sk_imageencoder_cg_factory);
SkImageEncoder* CreateImageEncoder_CG(SkImageEncoder::Type type) {
return new SkImageEncoder_CG(type);
#endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)