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// This is branched from AOSP's frameworks/base/opengl/include/ETC1/etc1.h 16// 17// It has been modified to implement Chromium's ETC1 API. The decoding path 18// has been removed as we do not require it. 19 20#ifndef THIRD_PARTY_ANDROID_OPENGL_ETC1_ETC1_H_ 21#define THIRD_PARTY_ANDROID_OPENGL_ETC1_ETC1_H_ 22 23// Return the size of the encoded image data. 24 25unsigned int etc1_get_encoded_data_size(unsigned int width, unsigned int height); 26 27// Encode an entire image. 28// pIn - pointer to the image data. Formatted such that 29// pixel (x,y) is at pIn + pixelSize * x + stride * y; 30// pOut - pointer to encoded data. Must be large enough to store entire encoded image. 31// pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image. 32// returns non-zero if there is an error. 33 34bool etc1_encode_image(const unsigned char* pIn, unsigned int width, unsigned int height, 35 unsigned int pixelSize, unsigned int stride, unsigned char* pOut, unsigned int outWidth, 36 unsigned int outHeight); 37 38// Decode an entire image. 39// pIn - pointer to encoded data. 40// pOut - pointer to the image data. Will be written such that 41// pixel (x,y) is at pIn + pixelSize * x + stride * y. Must be 42// large enough to store entire image. 43// pixelSize can be 2 or 3. 2 is an GL_UNSIGNED_SHORT_5_6_5 image, 3 is a GL_BYTE RGB image. 44// returns false if there is an error. 45 46bool etc1_decode_image(const unsigned char* pIn, unsigned char* pOut, 47 unsigned int width, unsigned int height, 48 unsigned int pixelSize, unsigned int stride); 49 50// Size of a PKM header, in bytes. 51 52#define ETC_PKM_HEADER_SIZE 16 53 54// Format a PKM header 55 56void etc1_pkm_format_header(unsigned char* pHeader, unsigned int width, unsigned int height); 57 58// Check if a PKM header is correctly formatted. 59 60bool etc1_pkm_is_valid(const unsigned char* pHeader); 61 62// Read the image width from a PKM header 63 64unsigned int etc1_pkm_get_width(const unsigned char* pHeader); 65 66// Read the image height from a PKM header 67 68unsigned int etc1_pkm_get_height(const unsigned char* pHeader); 69 70#endif // THIRD_PARTY_ANDROID_OPENGL_ETC1_ETC1_H_ 71