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
|
// Copyright 2009 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This is branched from AOSP's frameworks/base/opengl/include/ETC1/etc1.h
//
// It has been modified to implement Chromium's ETC1 API. The decoding path
// has been removed as we do not require it.
#ifndef THIRD_PARTY_ANDROID_OPENGL_ETC1_ETC1_H_
#define THIRD_PARTY_ANDROID_OPENGL_ETC1_ETC1_H_
// Return the size of the encoded image data.
unsigned int etc1_get_encoded_data_size(unsigned int width, unsigned int height);
// Encode an entire image.
// pIn - pointer to the image data. Formatted such that
// pixel (x,y) is at pIn + pixelSize * x + stride * y;
// pOut - pointer to encoded data. Must be large enough to store entire encoded image.
// pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image.
// returns non-zero if there is an error.
bool etc1_encode_image(const unsigned char* pIn, unsigned int width, unsigned int height,
unsigned int pixelSize, unsigned int stride, unsigned char* pOut, unsigned int outWidth,
unsigned int outHeight);
// Decode an entire image.
// pIn - pointer to encoded data.
// pOut - pointer to the image data. Will be written such that
// pixel (x,y) is at pIn + pixelSize * x + stride * y. Must be
// large enough to store entire image.
// pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image.
// returns false if there is an error.
bool etc1_decode_image(const unsigned char* pIn, unsigned char* pOut,
unsigned int width, unsigned int height,
unsigned int pixelSize, unsigned int stride);
// Size of a PKM header, in bytes.
#define ETC_PKM_HEADER_SIZE 16
// Format a PKM header
void etc1_pkm_format_header(unsigned char* pHeader, unsigned int width, unsigned int height);
// Check if a PKM header is correctly formatted.
bool etc1_pkm_is_valid(const unsigned char* pHeader);
// Read the image width from a PKM header
unsigned int etc1_pkm_get_width(const unsigned char* pHeader);
// Read the image height from a PKM header
unsigned int etc1_pkm_get_height(const unsigned char* pHeader);
#endif // THIRD_PARTY_ANDROID_OPENGL_ETC1_ETC1_H_
|
