src/codec/SkCodec_libbmp.h - Issue 1012873002: Revert "Implementation of image decoding for bmp files, in accordance with the new API."

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Issue 1012873002: Revert "Implementation of image decoding for bmp files, in accordance with the new API." (Closed) Base URL: https://skia.googlesource.com/skia.git@master

Patch Set: Created 5 years, 9 months ago

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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 "SkMaskSwizzler.h"

11 #include "SkStream.h"

12 #include "SkSwizzler.h"

13 #include "SkTypes.h"

14

15 // TODO: rename SkCodec_libbmp files to SkBmpCodec

16 // TODO: define a wrapper for SkDebugf that doesn't always print

17 /*

18 *

19 * This class implements the decoding for bmp images

20 *

21 */

22 class SkBmpCodec : public SkCodec {

23 public:

24

25 /*

26 *

27 * Describes if rows of the input start at the top or bottom of the image

28 *

29 */

30 enum RowOrder {

31 kTopDown_RowOrder,

32 kBottomUp_RowOrder

33 };

34

35 /*

36 *

37 * Checks the start of the stream to see if the image is a bitmap

38 *

39 */

40 static bool IsBmp(SkStream*);

41

42 /*

43 *

44 * Assumes IsBmp was called and returned true

45 * Creates a bitmap decoder

46 * Reads enough of the stream to determine the image format

47 *

48 */

49 static SkCodec* NewFromStream(SkStream*);

50

51 protected:

52

53 /*

54 *

55 * Initiates the bitmap decode

56 *

57 */

58 virtual Result onGetPixels(const SkImageInfo& dstInfo, void* dst,

59 size_t dstRowBytes, SkPMColor*,

60 int*) SK_OVERRIDE;

61

62 private:

63

64 /*

65 *

66 * Used to define the input format of the bitmap

67 *

68 */

69 enum BitmapInputFormat {

70 kStandard_BitmapInputFormat,

71 kRLE_BitmapInputFormat,

72 kBitMask_BitmapInputFormat,

73 kUnknown_BitmapInputFormat

74 };

75

76 /*

77 *

78 * Performs the bitmap decoding for bit masks input format

79 *

80 */

81 Result decodeMask(const SkImageInfo& dstInfo, void* dst,

82 size_t dstRowBytes);

83

84 /*

85 *

86 * Set an RLE pixel using the color table

87 *

88 */

89 void setRLEPixel(SkPMColor* dst, size_t dstRowBytes, int height,

90 uint32_t x, uint32_t y, uint8_t index);

91

92 /*

93 *

94 * Performs the bitmap decoding for RLE input format

95 *

96 */

97 Result decodeRLE(const SkImageInfo& dstInfo, void* dst,

98 size_t dstRowBytes);

99

100 /*

101 *

102 * Performs the bitmap decoding for standard input format

103 *

104 */

105 Result decode(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes);

106

107 /*

108 *

109 * Creates an instance of the decoder

110 * Called only by NewFromStream

111 *

112 * @param srcInfo contains the source width and height

113 * @param stream the stream of image data

114 * @param bitsPerPixel the number of bits used to store each pixel

115 * @param format the format of the bmp file

116 * @param masks optional color masks for certain bmp formats, passes

117 ownership to SkBmpCodec

118 * @param colorTable array representing the color table for index-based bmp

119 * formats, colors are unpremultiplied, passes ownership

120 * to SkBmpCodec

121 * @param rowOrder indicates whether rows are ordered top-down or bottom-up

122 * @param remainingBytes used only for RLE decodes, as we must decode all

123 * of the data at once rather than row by row

124 * it indicates the amount of data left in the stream

125 * after decoding the headers

126 *

127 */

128 SkBmpCodec(const SkImageInfo& srcInfo, SkStream* stream,

129 uint16_t bitsPerPixel, BitmapInputFormat format,

130 SkMasks* masks, SkPMColor* colorTable,

131 RowOrder rowOrder, uint32_t remainingBytes);

132

133 // Fields

134 const uint16_t fBitsPerPixel;

135 const BitmapInputFormat fInputFormat;

136 SkAutoTDelete<SkMasks> fMasks; // owned

137 const SkAutoTDeleteArray<SkPMColor> fColorTable; // owned, unpremul

138 const RowOrder fRowOrder;

139 const uint32_t fRemainingBytes;

140

141 typedef SkCodec INHERITED;

142 };

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