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- /*
- * Copyright (c) 2016, Alliance for Open Media. All rights reserved
- *
- * This source code is subject to the terms of the BSD 2 Clause License and
- * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
- * was not distributed with this source code in the LICENSE file, you can
- * obtain it at www.aomedia.org/license/software. If the Alliance for Open
- * Media Patent License 1.0 was not distributed with this source code in the
- * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
- */
- #ifndef AOM_AOM_DSP_BLEND_H_
- #define AOM_AOM_DSP_BLEND_H_
- #include "aom_ports/mem.h"
- // Various blending functions and macros.
- // See also the aom_blend_* functions in aom_dsp_rtcd.h
- // Alpha blending with alpha values from the range [0, 64], where 64
- // means use the first input and 0 means use the second input.
- #define AOM_BLEND_A64_ROUND_BITS 6
- #define AOM_BLEND_A64_MAX_ALPHA (1 << AOM_BLEND_A64_ROUND_BITS) // 64
- #define AOM_BLEND_A64(a, v0, v1) \
- ROUND_POWER_OF_TWO((a) * (v0) + (AOM_BLEND_A64_MAX_ALPHA - (a)) * (v1), \
- AOM_BLEND_A64_ROUND_BITS)
- // Alpha blending with alpha values from the range [0, 256], where 256
- // means use the first input and 0 means use the second input.
- #define AOM_BLEND_A256_ROUND_BITS 8
- #define AOM_BLEND_A256_MAX_ALPHA (1 << AOM_BLEND_A256_ROUND_BITS) // 256
- #define AOM_BLEND_A256(a, v0, v1) \
- ROUND_POWER_OF_TWO((a) * (v0) + (AOM_BLEND_A256_MAX_ALPHA - (a)) * (v1), \
- AOM_BLEND_A256_ROUND_BITS)
- // Blending by averaging.
- #define AOM_BLEND_AVG(v0, v1) ROUND_POWER_OF_TWO((v0) + (v1), 1)
- #define DIFF_FACTOR_LOG2 4
- #define DIFF_FACTOR (1 << DIFF_FACTOR_LOG2)
- #endif // AOM_AOM_DSP_BLEND_H_
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