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1 /* | |
2 * Copyright 2015 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 "SkCodec.h" | |
9 #include "SkImageInfo.h" | |
10 #include "SkStream.h" | |
11 #include "SkTypes.h" | |
12 | |
13 /* | |
14 * This class implements the decoding for bmp images | |
15 */ | |
16 class SkIcoCodec : public SkCodec { | |
17 public: | |
18 | |
19 /* | |
20 * Checks the start of the stream to see if the image is a Ico or Cur | |
21 */ | |
22 static bool IsIco(SkStream*); | |
23 | |
24 /* | |
25 * Assumes IsIco was called and returned true | |
26 * Creates an Ico decoder | |
27 * Reads enough of the stream to determine the image format | |
28 */ | |
29 static SkCodec* NewFromStream(SkStream*); | |
30 | |
31 protected: | |
32 | |
33 /* | |
34 * Chooses the best dimensions given the desired scale | |
35 */ | |
36 SkISize onGetScaledDimensions(float desiredScale) const SK_OVERRIDE; | |
37 | |
38 /* | |
39 * Initiates the Ico decode | |
40 */ | |
41 Result onGetPixels(const SkImageInfo& dstInfo, void* dst, | |
42 size_t dstRowBytes, const Options&, SkPMColor*, int*) | |
43 SK_OVERRIDE; | |
44 | |
45 SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE { | |
46 return kICO_SkEncodedFormat; | |
47 } | |
48 | |
49 private: | |
50 | |
51 /* | |
52 * Constructor called by NewFromStream | |
53 * @param embeddedCodecs codecs for the embedded images, takes ownership | |
54 */ | |
55 SkIcoCodec(const SkImageInfo& srcInfo, | |
56 SkTArray<SkAutoTDelete<SkCodec>, true>* embeddedCodecs); | |
57 | |
58 SkAutoTDelete<SkTArray<SkAutoTDelete<SkCodec>, true>> | |
59 fEmbeddedCodecs; // owned | |
60 | |
61 typedef SkCodec INHERITED; | |
62 }; | |
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