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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*) const SK_
OVERRIDE; | |
22 virtual void onDrawRectToRect(SkCanvas*, const SkRect*, const SkRect&, | |
23 const SkPaint*) const SK_OVERRIDE; | |
24 | |
25 virtual bool isOpaque() const SK_OVERRIDE; | |
26 | |
27 private: | |
28 bool ensureBitmapDecoded() const; | |
29 | |
30 SkData* fEncodedData; | |
31 SkBitmap fBitmap; | |
32 | |
33 typedef SkImage_Base INHERITED; | |
34 }; | |
35 | |
36 /////////////////////////////////////////////////////////////////////////////// | |
37 | |
38 SkImage_Codec::SkImage_Codec(SkData* data, int width, int height) : INHERITED(wi
dth, height) { | |
39 fEncodedData = data; | |
40 fEncodedData->ref(); | |
41 } | |
42 | |
43 SkImage_Codec::~SkImage_Codec() { | |
44 fEncodedData->unref(); | |
45 } | |
46 | |
47 bool SkImage_Codec::ensureBitmapDecoded() const { | |
48 if (!fBitmap.pixelRef()) { | |
49 // todo: this needs to be thread-safe | |
50 SkBitmap* bitmap = const_cast<SkBitmap*>(&fBitmap); | |
51 if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->s
ize(), bitmap)) { | |
52 return false; | |
53 } | |
54 } | |
55 return true; | |
56 } | |
57 | |
58 void SkImage_Codec::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPai
nt* paint) const { | |
59 if(!this->ensureBitmapDecoded()) { | |
60 return; | |
61 } | |
62 | |
63 canvas->drawBitmap(fBitmap, x, y, paint); | |
64 } | |
65 | |
66 void SkImage_Codec::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, const
SkRect& dst, | |
67 const SkPaint* paint) const { | |
68 if(!this->ensureBitmapDecoded()) { | |
69 return; | |
70 } | |
71 | |
72 canvas->drawBitmapRectToRect(fBitmap, src, dst, paint); | |
73 } | |
74 | |
75 /////////////////////////////////////////////////////////////////////////////// | |
76 | |
77 SkImage* SkImage::NewEncodedData(SkData* data) { | |
78 if (NULL == data) { | |
79 return NULL; | |
80 } | |
81 | |
82 SkBitmap bitmap; | |
83 if (!SkImageDecoder::DecodeMemory(data->bytes(), data->size(), &bitmap, kUnk
nown_SkColorType, | |
84 SkImageDecoder::kDecodeBounds_Mode)) { | |
85 return NULL; | |
86 } | |
87 | |
88 return SkNEW_ARGS(SkImage_Codec, (data, bitmap.width(), bitmap.height())); | |
89 } | |
90 | |
91 | |
92 bool SkImage_Codec::isOpaque() const { | |
93 return fBitmap.isOpaque(); | |
94 } | |
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