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 #pragma once 16 17 #include <stdint.h> 18 #include <cstddef> 19 20 enum RGTCImageFormat { BC4_UNORM, BC4_SNORM, BC5_UNORM, BC5_SNORM }; 21 22 #ifdef __cplusplus 23 extern "C" { 24 #endif 25 26 // Decode an entire image. 27 // pIn - pointer to encoded data. 28 // pOut - pointer to the image data. Will be written such that 29 // pixel (x,y) is at pIn + pixelSize * x + stride * y. Must be 30 // large enough to store entire image. 31 // (pixelSize=3 for rgb images, pixelSize=4 for images with alpha channel) 32 // returns non-zero if there is an error. 33 int rgtc_decode_image(const uint8_t* pIn, RGTCImageFormat format, uint8_t* pOut, uint32_t width, 34 uint32_t height, uint32_t stride); 35 36 size_t rgtc_get_encoded_image_size(RGTCImageFormat format, uint32_t width, uint32_t height); 37 38 size_t rgtc_get_decoded_pixel_size(RGTCImageFormat format); 39 40 #ifdef __cplusplus 41 } 42 #endif