1 /* 2 * Copyright 2015 Google Inc. 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 "SkBitmapRegionCanvas.h" 9 #include "SkBitmapRegionCodec.h" 10 #include "SkBitmapRegionDecoder.h" 11 #include "SkAndroidCodec.h" 12 #include "SkCodec.h" 13 #include "SkCodecPriv.h" 14 #include "SkImageDecoder.h" 15 Create(SkData * data,Strategy strategy)16SkBitmapRegionDecoder* SkBitmapRegionDecoder::Create( 17 SkData* data, Strategy strategy) { 18 return SkBitmapRegionDecoder::Create(new SkMemoryStream(data), 19 strategy); 20 } 21 Create(SkStreamRewindable * stream,Strategy strategy)22SkBitmapRegionDecoder* SkBitmapRegionDecoder::Create( 23 SkStreamRewindable* stream, Strategy strategy) { 24 SkAutoTDelete<SkStreamRewindable> streamDeleter(stream); 25 switch (strategy) { 26 case kCanvas_Strategy: { 27 SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(streamDeleter.detach())); 28 if (nullptr == codec) { 29 SkCodecPrintf("Error: Failed to create decoder.\n"); 30 return nullptr; 31 } 32 33 SkEncodedFormat format = codec->getEncodedFormat(); 34 switch (format) { 35 case SkEncodedFormat::kJPEG_SkEncodedFormat: 36 case SkEncodedFormat::kPNG_SkEncodedFormat: 37 break; 38 default: 39 // FIXME: Support webp using a special case. Webp does not support 40 // scanline decoding. 41 return nullptr; 42 } 43 44 // If the image is a jpeg or a png, the scanline ordering should always be 45 // kTopDown or kNone. It is relevant to check because this implementation 46 // only supports these two scanline orderings. 47 SkASSERT(SkCodec::kTopDown_SkScanlineOrder == codec->getScanlineOrder() || 48 SkCodec::kNone_SkScanlineOrder == codec->getScanlineOrder()); 49 50 return new SkBitmapRegionCanvas(codec.detach()); 51 } 52 case kAndroidCodec_Strategy: { 53 SkAutoTDelete<SkAndroidCodec> codec = 54 SkAndroidCodec::NewFromStream(streamDeleter.detach()); 55 if (nullptr == codec) { 56 SkCodecPrintf("Error: Failed to create codec.\n"); 57 return NULL; 58 } 59 60 SkEncodedFormat format = codec->getEncodedFormat(); 61 switch (format) { 62 case SkEncodedFormat::kJPEG_SkEncodedFormat: 63 case SkEncodedFormat::kPNG_SkEncodedFormat: 64 case SkEncodedFormat::kWEBP_SkEncodedFormat: 65 break; 66 default: 67 return nullptr; 68 } 69 70 return new SkBitmapRegionCodec(codec.detach()); 71 } 72 default: 73 SkASSERT(false); 74 return nullptr; 75 } 76 } 77