src/third_party/skia/src/image/SkImage_Codec.cpp

   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*) const SK_OVERRIDE;
  22     virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&,
  23                                   const SkPaint*) const SK_OVERRIDE;
  24
  25 private:
  26     SkData*     fEncodedData;
  27     SkBitmap    fBitmap;
  28
  29     typedef SkImage_Base INHERITED;
  30 };
  31
  32 ///////////////////////////////////////////////////////////////////////////////
  33
  34 SkImage_Codec::SkImage_Codec(SkData* data, int width, int height) : INHERITED(width, height) {
  35     fEncodedData = data;
  36     fEncodedData->ref();
  37 }
  38
  39 SkImage_Codec::~SkImage_Codec() {
  40     fEncodedData->unref();
  41 }
  42
  43 void SkImage_Codec::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const {
  44     if (!fBitmap.pixelRef()) {
  45         // todo: this needs to be thread-safe
  46         SkBitmap* bitmap = const_cast<SkBitmap*>(&fBitmap);
  47         if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(), bitmap)) {
  48             return;
  49         }
  50     }
  51     canvas->drawBitmap(fBitmap, x, y, paint);
  52 }
  53
  54 void SkImage_Codec::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
  55                                      const SkPaint* paint) const {
  56     if (!fBitmap.pixelRef()) {
  57         // todo: this needs to be thread-safe
  58         SkBitmap* bitmap = const_cast<SkBitmap*>(&fBitmap);
  59         if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(), bitmap)) {
  60             return;
  61         }
  62     }
  63     canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
  64 }
  65
  66 ///////////////////////////////////////////////////////////////////////////////
  67
  68 SkImage* SkImage::NewEncodedData(SkData* data) {
  69     if (NULL == data) {
  70         return NULL;
  71     }
  72
  73     SkBitmap bitmap;
  74     if (!SkImageDecoder::DecodeMemory(data->bytes(), data->size(), &bitmap, kUnknown_SkColorType,
  75                                       SkImageDecoder::kDecodeBounds_Mode)) {
  76         return NULL;
  77     }
  78
  79     return SkNEW_ARGS(SkImage_Codec, (data, bitmap.width(), bitmap.height()));
  80 }