1 /* 2 * Copyright 2012 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 "SkImageDecoder.h" 9 #include "SkImage_Base.h" 10 #include "SkBitmap.h" 11 #include "SkCanvas.h" 12 #include "SkData.h" 13 14 class SkImage_Codec : public SkImage_Base { 15 public: 16 static SkImage* NewEmpty(); 17 18 SkImage_Codec(SkData* encodedData, int width, int height); 19 virtual ~SkImage_Codec(); 20 21 virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE; 22 virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) SK_OVERRIDE; 23 24 private: 25 SkData* fEncodedData; 26 SkBitmap fBitmap; 27 28 typedef SkImage_Base INHERITED; 29 }; 30 31 /////////////////////////////////////////////////////////////////////////////// 32 33 SkImage_Codec::SkImage_Codec(SkData* data, int width, int height) : INHERITED(width, height) { 34 fEncodedData = data; 35 fEncodedData->ref(); 36 } 37 38 SkImage_Codec::~SkImage_Codec() { 39 fEncodedData->unref(); 40 } 41 42 void SkImage_Codec::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) { 43 if (!fBitmap.pixelRef()) { 44 if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(), 45 &fBitmap)) { 46 return; 47 } 48 } 49 canvas->drawBitmap(fBitmap, x, y, paint); 50 } 51 52 void SkImage_Codec::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, 53 const SkRect& dst, const SkPaint* paint) { 54 if (!fBitmap.pixelRef()) { 55 if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(), 56 &fBitmap)) { 57 return; 58 } 59 } 60 canvas->drawBitmapRectToRect(fBitmap, src, dst, paint); 61 } 62 63 /////////////////////////////////////////////////////////////////////////////// 64 65 SkImage* SkImage::NewEncodedData(SkData* data) { 66 if (NULL == data) { 67 return NULL; 68 } 69 70 SkBitmap bitmap; 71 if (!SkImageDecoder::DecodeMemory(data->bytes(), data->size(), &bitmap, 72 SkBitmap::kNo_Config, 73 SkImageDecoder::kDecodeBounds_Mode)) { 74 return NULL; 75 } 76 77 return SkNEW_ARGS(SkImage_Codec, (data, bitmap.width(), bitmap.height())); 78 } 79