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/* Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <Carbon/Carbon.h>
#include "SkImageDecoder.h"
#include "SkImageEncoder.h"
#include "SkMovie.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include "SkCGUtils.h"
static void malloc_release_proc(void* info, const void* data, size_t size) {
sk_free(info);
}
static CGDataProviderRef SkStreamToDataProvider(SkStream* stream) {
// TODO: use callbacks, so we don't have to load all the data into RAM
size_t len = stream->getLength();
void* data = sk_malloc_throw(len);
stream->read(data, len);
return CGDataProviderCreateWithData(data, data, len, malloc_release_proc);
}
static CGImageSourceRef SkStreamToCGImageSource(SkStream* stream) {
CGDataProviderRef data = SkStreamToDataProvider(stream);
CGImageSourceRef imageSrc = CGImageSourceCreateWithDataProvider(data, 0);
CGDataProviderRelease(data);
return imageSrc;
}
class SkImageDecoder_CG : public SkImageDecoder {
protected:
virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode);
};
#define BITMAP_INFO (kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast)
bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
if (NULL == imageSrc) {
return false;
}
SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSrc, 0, NULL);
if (NULL == image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> arimage(image);
const int width = CGImageGetWidth(image);
const int height = CGImageGetHeight(image);
bm->setConfig(SkBitmap::kARGB_8888_Config, width, height);
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
if (!this->allocPixelRef(bm, NULL)) {
return false;
}
bm->lockPixels();
bm->eraseColor(0);
CGColorSpaceRef cs = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height,
8, bm->rowBytes(), cs, BITMAP_INFO);
CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
CGContextRelease(cg);
CGColorSpaceRelease(cs);
bm->unlockPixels();
return true;
}
///////////////////////////////////////////////////////////////////////////////
SkImageDecoder* SkImageDecoder::Factory(SkStream* stream) {
return SkNEW(SkImageDecoder_CG);
}
/////////////////////////////////////////////////////////////////////////
SkMovie* SkMovie::DecodeStream(SkStream* stream) {
return NULL;
}
/////////////////////////////////////////////////////////////////////////
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 (NULL == consumer) {
return NULL;
}
SkAutoTCallVProc<const void, CFRelease> arconsumer(consumer);
return CGImageDestinationCreateWithDataConsumer(consumer, type, 1, NULL);
}
class SkImageEncoder_CG : public SkImageEncoder {
public:
SkImageEncoder_CG(Type t) : fType(t) {}
protected:
virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality);
private:
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) {
CFStringRef type;
switch (fType) {
case kJPEG_Type:
type = kUTTypeJPEG;
break;
case kPNG_Type:
type = kUTTypePNG;
break;
default:
return false;
}
CGImageDestinationRef dst = SkStreamToImageDestination(stream, type);
if (NULL == dst) {
return false;
}
SkAutoTCallVProc<const void, CFRelease> ardst(dst);
CGImageRef image = SkCreateCGImageRef(bm);
if (NULL == image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> agimage(image);
CGImageDestinationAddImage(dst, image, NULL);
CGImageDestinationFinalize(dst);
return true;
}
SkImageEncoder* SkImageEncoder::Create(Type t) {
switch (t) {
case kJPEG_Type:
case kPNG_Type:
break;
default:
return NULL;
}
return SkNEW_ARGS(SkImageEncoder_CG, (t));
}
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