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      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(), &fBitmap)) {
     45             return;
     46         }
     47     }
     48     canvas->drawBitmap(fBitmap, x, y, paint);
     49 }
     50 
     51 void SkImage_Codec::onDrawRectToRect(SkCanvas* canvas, const SkRect* src,
     52                                      const SkRect& dst, const SkPaint* paint) {
     53     if (!fBitmap.pixelRef()) {
     54         if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(), &fBitmap)) {
     55             return;
     56         }
     57     }
     58     canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
     59 }
     60 
     61 ///////////////////////////////////////////////////////////////////////////////
     62 
     63 SkImage* SkImage::NewEncodedData(SkData* data) {
     64     if (NULL == data) {
     65         return NULL;
     66     }
     67 
     68     SkBitmap bitmap;
     69     if (!SkImageDecoder::DecodeMemory(data->bytes(), data->size(), &bitmap, kUnknown_SkColorType,
     70                                       SkImageDecoder::kDecodeBounds_Mode)) {
     71         return NULL;
     72     }
     73 
     74     return SkNEW_ARGS(SkImage_Codec, (data, bitmap.width(), bitmap.height()));
     75 }
     76