src/ports/SkImageDecoder_CG.cpp - platform/external/skia - Gitiles

 /*
  * 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 "SkCGUtils.h"
 #include "SkColorPriv.h"
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkMovie.h"
 #include "SkStream.h"
 #include "SkStreamHelpers.h"
 #include "SkTemplates.h"
 #include "SkUnPreMultiply.h"

 #ifdef SK_BUILD_FOR_MAC
 #include <ApplicationServices/ApplicationServices.h>
 #endif

 #ifdef SK_BUILD_FOR_IOS
 #include <CoreGraphics/CoreGraphics.h>
 #include <ImageIO/ImageIO.h>
 #include <MobileCoreServices/MobileCoreServices.h>
 #endif

 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
     SkAutoMalloc storage;
     const size_t len = CopyStreamToStorage(&storage, stream);
     void* data = storage.detach();

     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);
 };

 // Returns an unpremultiplied version of color. It will have the same ordering and size as an
 // SkPMColor, but the alpha will not be premultiplied.
 static SkPMColor unpremultiply_pmcolor(SkPMColor color) {
     U8CPU a = SkGetPackedA32(color);
     const SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(a);
     return SkPackARGB32NoCheck(a,
                                SkUnPreMultiply::ApplyScale(scale, SkGetPackedR32(color)),
                                SkUnPreMultiply::ApplyScale(scale, SkGetPackedG32(color)),
                                SkUnPreMultiply::ApplyScale(scale, SkGetPackedB32(color)));
 }

 #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(SK_ColorTRANSPARENT);

     CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
     CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height, 8, bm->rowBytes(), cs, BITMAP_INFO);
     CFRelease(cs);

     CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
     CGContextRelease(cg);

     CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
     switch (info) {
         case kCGImageAlphaNone:
         case kCGImageAlphaNoneSkipLast:
         case kCGImageAlphaNoneSkipFirst:
             SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
             bm->setAlphaType(kOpaque_SkAlphaType);
             break;
         default:
             // we don't know if we're opaque or not, so compute it.
             if (SkBitmap::ComputeIsOpaque(*bm)) {
                 bm->setAlphaType(kOpaque_SkAlphaType);
             }
     }
     if (!bm->isOpaque() && this->getRequireUnpremultipliedColors()) {
         // CGBitmapContext does not support unpremultiplied, so the image has been premultiplied.
         // Convert to unpremultiplied.
         for (int i = 0; i < width; ++i) {
             for (int j = 0; j < height; ++j) {
                 uint32_t* addr = bm->getAddr32(i, j);
                 *addr = unpremultiply_pmcolor(*addr);
             }
         }
         bm->setAlphaType(kUnpremul_SkAlphaType);
     }
     bm->unlockPixels();
     return true;
 }

 ///////////////////////////////////////////////////////////////////////////////

 extern SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);

 SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
     SkImageDecoder* decoder = image_decoder_from_stream(stream);
     if (NULL == decoder) {
         // If no image decoder specific to the stream exists, use SkImageDecoder_CG.
         return SkNEW(SkImageDecoder_CG);
     } else {
         return decoder;
     }
 }

 /////////////////////////////////////////////////////////////////////////

 SkMovie* SkMovie::DecodeStream(SkStreamRewindable* 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) {
     // Used for converting a bitmap to 8888.
     const SkBitmap* bmPtr = &bm;
     SkBitmap bitmap8888;

     CFStringRef type;
     switch (fType) {
         case kICO_Type:
             type = kUTTypeICO;
             break;
         case kBMP_Type:
             type = kUTTypeBMP;
             break;
         case kGIF_Type:
             type = kUTTypeGIF;
             break;
         case kJPEG_Type:
             type = kUTTypeJPEG;
             break;
         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.config() == SkBitmap::kARGB_4444_Config) {
                 bm.copyTo(&bitmap8888, SkBitmap::kARGB_8888_Config);
                 bmPtr = &bitmap8888;
             }
             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(*bmPtr);
     if (NULL == image) {
         return false;
     }
     SkAutoTCallVProc<CGImage, CGImageRelease> agimage(image);

     CGImageDestinationAddImage(dst, image, NULL);
     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:
             break;
         default:
             return NULL;
     }
     return SkNEW_ARGS(SkImageEncoder_CG, (t));
 }

 static SkImageEncoder_EncodeReg gEReg(sk_imageencoder_cg_factory);

 struct FormatConversion {
     CFStringRef             fUTType;
     SkImageDecoder::Format  fFormat;
 };

 // Array of the types supported by the decoder.
 static const FormatConversion gFormatConversions[] = {
     { kUTTypeBMP, SkImageDecoder::kBMP_Format },
     { kUTTypeGIF, SkImageDecoder::kGIF_Format },
     { kUTTypeICO, SkImageDecoder::kICO_Format },
     { kUTTypeJPEG, SkImageDecoder::kJPEG_Format },
     // Also include JPEG2000
     { kUTTypeJPEG2000, SkImageDecoder::kJPEG_Format },
     { kUTTypePNG, SkImageDecoder::kPNG_Format },
 };

 static SkImageDecoder::Format UTType_to_Format(const CFStringRef uttype) {
     for (size_t i = 0; i < SK_ARRAY_COUNT(gFormatConversions); i++) {
         if (CFStringCompare(uttype, gFormatConversions[i].fUTType, 0) == kCFCompareEqualTo) {
             return gFormatConversions[i].fFormat;
         }
     }
     return SkImageDecoder::kUnknown_Format;
 }

 static SkImageDecoder::Format get_format_cg(SkStreamRewindable* stream) {
     CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);

     if (NULL == imageSrc) {
         return SkImageDecoder::kUnknown_Format;
     }

     SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
     const CFStringRef name = CGImageSourceGetType(imageSrc);
     if (NULL == name) {
         return SkImageDecoder::kUnknown_Format;
     }
     return UTType_to_Format(name);
 }

 static SkImageDecoder_FormatReg gFormatReg(get_format_cg);
	/*
	* 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 "SkCGUtils.h"
	#include "SkColorPriv.h"
	#include "SkImageDecoder.h"
	#include "SkImageEncoder.h"
	#include "SkMovie.h"
	#include "SkStream.h"
	#include "SkStreamHelpers.h"
	#include "SkTemplates.h"
	#include "SkUnPreMultiply.h"

	#ifdef SK_BUILD_FOR_MAC
	#include <ApplicationServices/ApplicationServices.h>
	#endif

	#ifdef SK_BUILD_FOR_IOS
	#include <CoreGraphics/CoreGraphics.h>
	#include <ImageIO/ImageIO.h>
	#include <MobileCoreServices/MobileCoreServices.h>
	#endif

	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
	SkAutoMalloc storage;
	const size_t len = CopyStreamToStorage(&storage, stream);
	void* data = storage.detach();

	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);
	};

	// Returns an unpremultiplied version of color. It will have the same ordering and size as an
	// SkPMColor, but the alpha will not be premultiplied.
	static SkPMColor unpremultiply_pmcolor(SkPMColor color) {
	U8CPU a = SkGetPackedA32(color);
	const SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(a);
	return SkPackARGB32NoCheck(a,
	SkUnPreMultiply::ApplyScale(scale, SkGetPackedR32(color)),
	SkUnPreMultiply::ApplyScale(scale, SkGetPackedG32(color)),
	SkUnPreMultiply::ApplyScale(scale, SkGetPackedB32(color)));
	}

	#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(SK_ColorTRANSPARENT);

	CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
	CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height, 8, bm->rowBytes(), cs, BITMAP_INFO);
	CFRelease(cs);

	CGContextDrawImage(cg, CGRectMake(0, 0, width, height), image);
	CGContextRelease(cg);

	CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
	switch (info) {
	case kCGImageAlphaNone:
	case kCGImageAlphaNoneSkipLast:
	case kCGImageAlphaNoneSkipFirst:
	SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
	bm->setAlphaType(kOpaque_SkAlphaType);
	break;
	default:
	// we don't know if we're opaque or not, so compute it.
	if (SkBitmap::ComputeIsOpaque(*bm)) {
	bm->setAlphaType(kOpaque_SkAlphaType);
	}
	}
	if (!bm->isOpaque() && this->getRequireUnpremultipliedColors()) {
	// CGBitmapContext does not support unpremultiplied, so the image has been premultiplied.
	// Convert to unpremultiplied.
	for (int i = 0; i < width; ++i) {
	for (int j = 0; j < height; ++j) {
	uint32_t* addr = bm->getAddr32(i, j);
	addr = unpremultiply_pmcolor(addr);
	}
	}
	bm->setAlphaType(kUnpremul_SkAlphaType);
	}
	bm->unlockPixels();
	return true;
	}

	///////////////////////////////////////////////////////////////////////////////

	extern SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);

	SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
	SkImageDecoder* decoder = image_decoder_from_stream(stream);
	if (NULL == decoder) {
	// If no image decoder specific to the stream exists, use SkImageDecoder_CG.
	return SkNEW(SkImageDecoder_CG);
	} else {
	return decoder;
	}
	}

	/////////////////////////////////////////////////////////////////////////

	SkMovie* SkMovie::DecodeStream(SkStreamRewindable* 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) {
	// Used for converting a bitmap to 8888.
	const SkBitmap* bmPtr = &bm;
	SkBitmap bitmap8888;

	CFStringRef type;
	switch (fType) {
	case kICO_Type:
	type = kUTTypeICO;
	break;
	case kBMP_Type:
	type = kUTTypeBMP;
	break;
	case kGIF_Type:
	type = kUTTypeGIF;
	break;
	case kJPEG_Type:
	type = kUTTypeJPEG;
	break;
	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.config() == SkBitmap::kARGB_4444_Config) {
	bm.copyTo(&bitmap8888, SkBitmap::kARGB_8888_Config);
	bmPtr = &bitmap8888;
	}
	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(*bmPtr);
	if (NULL == image) {
	return false;
	}
	SkAutoTCallVProc<CGImage, CGImageRelease> agimage(image);

	CGImageDestinationAddImage(dst, image, NULL);
	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:
	break;
	default:
	return NULL;
	}
	return SkNEW_ARGS(SkImageEncoder_CG, (t));
	}

	static SkImageEncoder_EncodeReg gEReg(sk_imageencoder_cg_factory);

	struct FormatConversion {
	CFStringRef fUTType;
	SkImageDecoder::Format fFormat;
	};

	// Array of the types supported by the decoder.
	static const FormatConversion gFormatConversions[] = {
	{ kUTTypeBMP, SkImageDecoder::kBMP_Format },
	{ kUTTypeGIF, SkImageDecoder::kGIF_Format },
	{ kUTTypeICO, SkImageDecoder::kICO_Format },
	{ kUTTypeJPEG, SkImageDecoder::kJPEG_Format },
	// Also include JPEG2000
	{ kUTTypeJPEG2000, SkImageDecoder::kJPEG_Format },
	{ kUTTypePNG, SkImageDecoder::kPNG_Format },
	};

	static SkImageDecoder::Format UTType_to_Format(const CFStringRef uttype) {
	for (size_t i = 0; i < SK_ARRAY_COUNT(gFormatConversions); i++) {
	if (CFStringCompare(uttype, gFormatConversions[i].fUTType, 0) == kCFCompareEqualTo) {
	return gFormatConversions[i].fFormat;
	}
	}
	return SkImageDecoder::kUnknown_Format;
	}

	static SkImageDecoder::Format get_format_cg(SkStreamRewindable* stream) {
	CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);

	if (NULL == imageSrc) {
	return SkImageDecoder::kUnknown_Format;
	}

	SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
	const CFStringRef name = CGImageSourceGetType(imageSrc);
	if (NULL == name) {
	return SkImageDecoder::kUnknown_Format;
	}
	return UTType_to_Format(name);
	}

	static SkImageDecoder_FormatReg gFormatReg(get_format_cg);