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
SkImage_Codec(SkData * data,int width,int height)33 SkImage_Codec::SkImage_Codec(SkData* data, int width, int height) : INHERITED(width, height) {
34 fEncodedData = data;
35 fEncodedData->ref();
36 }
37
~SkImage_Codec()38 SkImage_Codec::~SkImage_Codec() {
39 fEncodedData->unref();
40 }
41
onDraw(SkCanvas * canvas,SkScalar x,SkScalar y,const SkPaint * paint)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
onDrawRectToRect(SkCanvas * canvas,const SkRect * src,const SkRect & dst,const SkPaint * paint)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
NewEncodedData(SkData * data)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