1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBmpCodec.h"
#include "SkColorTable.h"
#include "SkImageInfo.h"
#include "SkSwizzler.h"
#include "SkTypes.h"
/*
* This class implements the decoding for bmp images that use "standard" modes,
* which essentially means they do not contain bit masks or RLE codes.
*/
class SkBmpStandardCodec : public SkBmpCodec {
public:
/*
* Creates an instance of the decoder
*
* Called only by SkBmpCodec::NewFromStream
* There should be no other callers despite this being public
*
* @param srcInfo contains the source width and height
* @param stream the stream of encoded image data
* @param bitsPerPixel the number of bits used to store each pixel
* @param format the format of the bmp file
* @param numColors the number of colors in the color table
* @param bytesPerColor the number of bytes in the stream used to represent
each color in the color table
* @param offset the offset of the image pixel data from the end of the
* headers
* @param rowOrder indicates whether rows are ordered top-down or bottom-up
*/
SkBmpStandardCodec(const SkImageInfo& srcInfo, SkStream* stream,
uint16_t bitsPerPixel, uint32_t numColors, uint32_t bytesPerColor,
uint32_t offset, SkCodec::SkScanlineOrder rowOrder,
bool isIco);
protected:
Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
size_t dstRowBytes, const Options&, SkPMColor*,
int*) override;
bool onInIco() const override {
return fInIco;
}
SkCodec::Result prepareToDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options, SkPMColor inputColorPtr[],
int* inputColorCount) override;
private:
/*
* Creates the color table
* Sets colorCount to the new color count if it is non-nullptr
*/
bool createColorTable(SkAlphaType alphaType, int* colorCount);
bool initializeSwizzler(const SkImageInfo& dstInfo, const Options& opts);
Result decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
const Options& opts) override;
Result decodeIcoMask(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes);
SkAutoTUnref<SkColorTable> fColorTable; // owned
const uint32_t fNumColors;
const uint32_t fBytesPerColor;
const uint32_t fOffset;
SkAutoTDelete<SkSwizzler> fSwizzler;
const size_t fSrcRowBytes;
SkAutoTDeleteArray<uint8_t> fSrcBuffer;
const bool fInIco;
typedef SkBmpCodec INHERITED;
};
|
