1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AOM_DSP_BLEND_H_ 13 #define AOM_AOM_DSP_BLEND_H_ 14 15 #include "aom_ports/mem.h" 16 17 // Various blending functions and macros. 18 // See also the aom_blend_* functions in aom_dsp_rtcd.h 19 20 // Alpha blending with alpha values from the range [0, 64], where 64 21 // means use the first input and 0 means use the second input. 22 23 #define AOM_BLEND_A64_ROUND_BITS 6 24 #define AOM_BLEND_A64_MAX_ALPHA (1 << AOM_BLEND_A64_ROUND_BITS) // 64 25 26 #define AOM_BLEND_A64(a, v0, v1) \ 27 ROUND_POWER_OF_TWO((a) * (v0) + (AOM_BLEND_A64_MAX_ALPHA - (a)) * (v1), \ 28 AOM_BLEND_A64_ROUND_BITS) 29 30 // Alpha blending with alpha values from the range [0, 256], where 256 31 // means use the first input and 0 means use the second input. 32 #define AOM_BLEND_A256_ROUND_BITS 8 33 #define AOM_BLEND_A256_MAX_ALPHA (1 << AOM_BLEND_A256_ROUND_BITS) // 256 34 35 #define AOM_BLEND_A256(a, v0, v1) \ 36 ROUND_POWER_OF_TWO((a) * (v0) + (AOM_BLEND_A256_MAX_ALPHA - (a)) * (v1), \ 37 AOM_BLEND_A256_ROUND_BITS) 38 39 // Blending by averaging. 40 #define AOM_BLEND_AVG(v0, v1) ROUND_POWER_OF_TWO((v0) + (v1), 1) 41 42 #define DIFF_FACTOR_LOG2 4 43 #define DIFF_FACTOR (1 << DIFF_FACTOR_LOG2) 44 45 #endif // AOM_AOM_DSP_BLEND_H_ 46