third_party/etc1/etc1.h - Issue 1296253003: Depend on ETC1 via DEPS instead of a direct third_party checkin.

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Issue 1296253003: Depend on ETC1 via DEPS instead of a direct third_party checkin. (Closed) Base URL: https://skia.googlesource.com/skia.git@master

Patch Set: Created 5 years, 4 months ago

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1 // Copyright 2009 Google Inc.

2 //

3 // Licensed under the Apache License, Version 2.0 (the "License");

4 // you may not use this file except in compliance with the License.

5 // You may obtain a copy of the License at

6 //

7 // http://www.apache.org/licenses/LICENSE-2.0

8 //

9 // Unless required by applicable law or agreed to in writing, software

10 // distributed under the License is distributed on an "AS IS" BASIS,

11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

12 // See the License for the specific language governing permissions and

13 // limitations under the License.

14

15 //////////////////////////////////////////////////////////////////////////////// //////////

16

17 // This is a fork of the AOSP project ETC1 codec. The original code can be found

18 // at the following web site:

19 // https://android.googlesource.com/platform/frameworks/native/+/master/opengl/l ibs/ETC1/

20

21 //////////////////////////////////////////////////////////////////////////////// //////////

22

23 #ifndef __etc1_h__

24 #define __etc1_h__

25

26 #define ETC1_ENCODED_BLOCK_SIZE 8

27 #define ETC1_DECODED_BLOCK_SIZE 48

28

29 #ifndef ETC1_RGB8_OES

30 #define ETC1_RGB8_OES 0x8D64

31 #endif

32

33 typedef unsigned char etc1_byte;

34 typedef int etc1_bool;

35 typedef unsigned int etc1_uint32;

36

37 #ifdef __cplusplus

38 extern "C" {

39 #endif

40

41 // Encode a block of pixels.

42 //

43 // pIn is a pointer to a ETC_DECODED_BLOCK_SIZE array of bytes that represent a

44 // 4 x 4 square of 3-byte pixels in form R, G, B. Byte (3 * (x + 4 * y) is the R

45 // value of pixel (x, y).

46 //

47 // validPixelMask is a 16-bit mask where bit (1 << (x + y * 4)) indicates whethe r

48 // the corresponding (x,y) pixel is valid. Invalid pixel color values are ignore d when compressing.

49 //

50 // pOut is an ETC1 compressed version of the data.

51

52 void etc1_encode_block(const etc1_byte* pIn, etc1_uint32 validPixelMask, etc1_by te* pOut);

53

54 // Decode a block of pixels.

55 //

56 // pIn is an ETC1 compressed version of the data.

57 //

58 // pOut is a pointer to a ETC_DECODED_BLOCK_SIZE array of bytes that represent a

59 // 4 x 4 square of 3-byte pixels in form R, G, B. Byte (3 * (x + 4 * y) is the R

60 // value of pixel (x, y).

61

62 void etc1_decode_block(const etc1_byte* pIn, etc1_byte* pOut);

63

64 // Return the size of the encoded image data (does not include size of PKM heade r).

65

66 etc1_uint32 etc1_get_encoded_data_size(etc1_uint32 width, etc1_uint32 height);

67

68 // Encode an entire image.

69 // pIn - pointer to the image data. Formatted such that

70 // pixel (x,y) is at pIn + pixelSize * x + stride * y;

71 // pOut - pointer to encoded data. Must be large enough to store entire encoded image.

72 // pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYT E RGB image.

73 // returns non-zero if there is an error.

74

75 int etc1_encode_image(const etc1_byte* pIn, etc1_uint32 width, etc1_uint32 heigh t,

76 etc1_uint32 pixelSize, etc1_uint32 stride, etc1_byte* pOut);

77

78 // Decode an entire image.

79 // pIn - pointer to encoded data.

80 // pOut - pointer to the image data. Will be written such that

81 // pixel (x,y) is at pIn + pixelSize * x + stride * y. Must be

82 // large enough to store entire image.

83 // pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYT E RGB image.

84 // returns non-zero if there is an error.

85

86 int etc1_decode_image(const etc1_byte* pIn, etc1_byte* pOut,

87 etc1_uint32 width, etc1_uint32 height,

88 etc1_uint32 pixelSize, etc1_uint32 stride);

89

90 // Size of a PKM header, in bytes.

91

92 #define ETC_PKM_HEADER_SIZE 16

93

94 // Format a PKM header

95

96 void etc1_pkm_format_header(etc1_byte* pHeader, etc1_uint32 width, etc1_uint32 h eight);

97

98 // Check if a PKM header is correctly formatted.

99

100 etc1_bool etc1_pkm_is_valid(const etc1_byte* pHeader);

101

102 // Read the image width from a PKM header

103

104 etc1_uint32 etc1_pkm_get_width(const etc1_byte* pHeader);

105

106 // Read the image height from a PKM header

107

108 etc1_uint32 etc1_pkm_get_height(const etc1_byte* pHeader);

109

110 #ifdef __cplusplus

111 }

112 #endif

113

114 #endif

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