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      1 /*
      2  * Copyright 2008 The Android Open Source Project
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkCGUtils.h"
      9 #include "SkColorPriv.h"
     10 #include "SkImageDecoder.h"
     11 #include "SkImageEncoder.h"
     12 #include "SkMovie.h"
     13 #include "SkStream.h"
     14 #include "SkStreamHelpers.h"
     15 #include "SkTemplates.h"
     16 #include "SkUnPreMultiply.h"
     17 
     18 #ifdef SK_BUILD_FOR_MAC
     19 #include <ApplicationServices/ApplicationServices.h>
     20 #endif
     21 
     22 #ifdef SK_BUILD_FOR_IOS
     23 #include <CoreGraphics/CoreGraphics.h>
     24 #include <ImageIO/ImageIO.h>
     25 #include <MobileCoreServices/MobileCoreServices.h>
     26 #endif
     27 
     28 static void malloc_release_proc(void* info, const void* data, size_t size) {
     29     sk_free(info);
     30 }
     31 
     32 static CGDataProviderRef SkStreamToDataProvider(SkStream* stream) {
     33     // TODO: use callbacks, so we don't have to load all the data into RAM
     34     SkAutoMalloc storage;
     35     const size_t len = CopyStreamToStorage(&storage, stream);
     36     void* data = storage.detach();
     37 
     38     return CGDataProviderCreateWithData(data, data, len, malloc_release_proc);
     39 }
     40 
     41 static CGImageSourceRef SkStreamToCGImageSource(SkStream* stream) {
     42     CGDataProviderRef data = SkStreamToDataProvider(stream);
     43     CGImageSourceRef imageSrc = CGImageSourceCreateWithDataProvider(data, 0);
     44     CGDataProviderRelease(data);
     45     return imageSrc;
     46 }
     47 
     48 class SkImageDecoder_CG : public SkImageDecoder {
     49 protected:
     50     virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode);
     51 };
     52 
     53 #define BITMAP_INFO (kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast)
     54 
     55 bool SkImageDecoder_CG::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
     56     CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
     57 
     58     if (NULL == imageSrc) {
     59         return false;
     60     }
     61     SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
     62 
     63     CGImageRef image = CGImageSourceCreateImageAtIndex(imageSrc, 0, NULL);
     64     if (NULL == image) {
     65         return false;
     66     }
     67     SkAutoTCallVProc<CGImage, CGImageRelease> arimage(image);
     68 
     69     const int width = SkToInt(CGImageGetWidth(image));
     70     const int height = SkToInt(CGImageGetHeight(image));
     71 
     72     bm->setInfo(SkImageInfo::MakeN32Premul(width, height));
     73     if (SkImageDecoder::kDecodeBounds_Mode == mode) {
     74         return true;
     75     }
     76 
     77     if (!this->allocPixelRef(bm, NULL)) {
     78         return false;
     79     }
     80 
     81     SkAutoLockPixels alp(*bm);
     82 
     83     if (!SkCopyPixelsFromCGImage(bm->info(), bm->rowBytes(), bm->getPixels(), image)) {
     84         return false;
     85     }
     86 
     87     CGImageAlphaInfo info = CGImageGetAlphaInfo(image);
     88     switch (info) {
     89         case kCGImageAlphaNone:
     90         case kCGImageAlphaNoneSkipLast:
     91         case kCGImageAlphaNoneSkipFirst:
     92             SkASSERT(SkBitmap::ComputeIsOpaque(*bm));
     93             bm->setAlphaType(kOpaque_SkAlphaType);
     94             break;
     95         default:
     96             // we don't know if we're opaque or not, so compute it.
     97             if (SkBitmap::ComputeIsOpaque(*bm)) {
     98                 bm->setAlphaType(kOpaque_SkAlphaType);
     99             }
    100     }
    101     if (!bm->isOpaque() && this->getRequireUnpremultipliedColors()) {
    102         // CGBitmapContext does not support unpremultiplied, so the image has been premultiplied.
    103         // Convert to unpremultiplied.
    104         for (int i = 0; i < width; ++i) {
    105             for (int j = 0; j < height; ++j) {
    106                 uint32_t* addr = bm->getAddr32(i, j);
    107                 *addr = SkUnPreMultiply::UnPreMultiplyPreservingByteOrder(*addr);
    108             }
    109         }
    110         bm->setAlphaType(kUnpremul_SkAlphaType);
    111     }
    112     return true;
    113 }
    114 
    115 ///////////////////////////////////////////////////////////////////////////////
    116 
    117 extern SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);
    118 
    119 SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
    120     SkImageDecoder* decoder = image_decoder_from_stream(stream);
    121     if (NULL == decoder) {
    122         // If no image decoder specific to the stream exists, use SkImageDecoder_CG.
    123         return SkNEW(SkImageDecoder_CG);
    124     } else {
    125         return decoder;
    126     }
    127 }
    128 
    129 /////////////////////////////////////////////////////////////////////////
    130 
    131 SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) {
    132     return NULL;
    133 }
    134 
    135 /////////////////////////////////////////////////////////////////////////
    136 
    137 static size_t consumer_put(void* info, const void* buffer, size_t count) {
    138     SkWStream* stream = reinterpret_cast<SkWStream*>(info);
    139     return stream->write(buffer, count) ? count : 0;
    140 }
    141 
    142 static void consumer_release(void* info) {
    143     // we do nothing, since by design we don't "own" the stream (i.e. info)
    144 }
    145 
    146 static CGDataConsumerRef SkStreamToCGDataConsumer(SkWStream* stream) {
    147     CGDataConsumerCallbacks procs;
    148     procs.putBytes = consumer_put;
    149     procs.releaseConsumer = consumer_release;
    150     // we don't own/reference the stream, so it our consumer must not live
    151     // longer that our caller's ownership of the stream
    152     return CGDataConsumerCreate(stream, &procs);
    153 }
    154 
    155 static CGImageDestinationRef SkStreamToImageDestination(SkWStream* stream,
    156                                                         CFStringRef type) {
    157     CGDataConsumerRef consumer = SkStreamToCGDataConsumer(stream);
    158     if (NULL == consumer) {
    159         return NULL;
    160     }
    161     SkAutoTCallVProc<const void, CFRelease> arconsumer(consumer);
    162 
    163     return CGImageDestinationCreateWithDataConsumer(consumer, type, 1, NULL);
    164 }
    165 
    166 class SkImageEncoder_CG : public SkImageEncoder {
    167 public:
    168     SkImageEncoder_CG(Type t) : fType(t) {}
    169 
    170 protected:
    171     virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality);
    172 
    173 private:
    174     Type fType;
    175 };
    176 
    177 /*  Encode bitmaps via CGImageDestination. We setup a DataConsumer which writes
    178     to our SkWStream. Since we don't reference/own the SkWStream, our consumer
    179     must only live for the duration of the onEncode() method.
    180  */
    181 bool SkImageEncoder_CG::onEncode(SkWStream* stream, const SkBitmap& bm,
    182                                  int quality) {
    183     // Used for converting a bitmap to 8888.
    184     const SkBitmap* bmPtr = &bm;
    185     SkBitmap bitmap8888;
    186 
    187     CFStringRef type;
    188     switch (fType) {
    189         case kICO_Type:
    190             type = kUTTypeICO;
    191             break;
    192         case kBMP_Type:
    193             type = kUTTypeBMP;
    194             break;
    195         case kGIF_Type:
    196             type = kUTTypeGIF;
    197             break;
    198         case kJPEG_Type:
    199             type = kUTTypeJPEG;
    200             break;
    201         case kPNG_Type:
    202             // PNG encoding an ARGB_4444 bitmap gives the following errors in GM:
    203             // <Error>: CGImageDestinationAddImage image could not be converted to destination
    204             // format.
    205             // <Error>: CGImageDestinationFinalize image destination does not have enough images
    206             // So instead we copy to 8888.
    207             if (bm.colorType() == kARGB_4444_SkColorType) {
    208                 bm.copyTo(&bitmap8888, kN32_SkColorType);
    209                 bmPtr = &bitmap8888;
    210             }
    211             type = kUTTypePNG;
    212             break;
    213         default:
    214             return false;
    215     }
    216 
    217     CGImageDestinationRef dst = SkStreamToImageDestination(stream, type);
    218     if (NULL == dst) {
    219         return false;
    220     }
    221     SkAutoTCallVProc<const void, CFRelease> ardst(dst);
    222 
    223     CGImageRef image = SkCreateCGImageRef(*bmPtr);
    224     if (NULL == image) {
    225         return false;
    226     }
    227     SkAutoTCallVProc<CGImage, CGImageRelease> agimage(image);
    228 
    229     CGImageDestinationAddImage(dst, image, NULL);
    230     return CGImageDestinationFinalize(dst);
    231 }
    232 
    233 ///////////////////////////////////////////////////////////////////////////////
    234 
    235 static SkImageEncoder* sk_imageencoder_cg_factory(SkImageEncoder::Type t) {
    236     switch (t) {
    237         case SkImageEncoder::kICO_Type:
    238         case SkImageEncoder::kBMP_Type:
    239         case SkImageEncoder::kGIF_Type:
    240         case SkImageEncoder::kJPEG_Type:
    241         case SkImageEncoder::kPNG_Type:
    242             break;
    243         default:
    244             return NULL;
    245     }
    246     return SkNEW_ARGS(SkImageEncoder_CG, (t));
    247 }
    248 
    249 static SkImageEncoder_EncodeReg gEReg(sk_imageencoder_cg_factory);
    250 
    251 struct FormatConversion {
    252     CFStringRef             fUTType;
    253     SkImageDecoder::Format  fFormat;
    254 };
    255 
    256 // Array of the types supported by the decoder.
    257 static const FormatConversion gFormatConversions[] = {
    258     { kUTTypeBMP, SkImageDecoder::kBMP_Format },
    259     { kUTTypeGIF, SkImageDecoder::kGIF_Format },
    260     { kUTTypeICO, SkImageDecoder::kICO_Format },
    261     { kUTTypeJPEG, SkImageDecoder::kJPEG_Format },
    262     // Also include JPEG2000
    263     { kUTTypeJPEG2000, SkImageDecoder::kJPEG_Format },
    264     { kUTTypePNG, SkImageDecoder::kPNG_Format },
    265 };
    266 
    267 static SkImageDecoder::Format UTType_to_Format(const CFStringRef uttype) {
    268     for (size_t i = 0; i < SK_ARRAY_COUNT(gFormatConversions); i++) {
    269         if (CFStringCompare(uttype, gFormatConversions[i].fUTType, 0) == kCFCompareEqualTo) {
    270             return gFormatConversions[i].fFormat;
    271         }
    272     }
    273     return SkImageDecoder::kUnknown_Format;
    274 }
    275 
    276 static SkImageDecoder::Format get_format_cg(SkStreamRewindable* stream) {
    277     CGImageSourceRef imageSrc = SkStreamToCGImageSource(stream);
    278 
    279     if (NULL == imageSrc) {
    280         return SkImageDecoder::kUnknown_Format;
    281     }
    282 
    283     SkAutoTCallVProc<const void, CFRelease> arsrc(imageSrc);
    284     const CFStringRef name = CGImageSourceGetType(imageSrc);
    285     if (NULL == name) {
    286         return SkImageDecoder::kUnknown_Format;
    287     }
    288     return UTType_to_Format(name);
    289 }
    290 
    291 static SkImageDecoder_FormatReg gFormatReg(get_format_cg);
    292