зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
3.1 KiB
C
99 строки
3.1 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AOM_AOM_DSP_AOM_DSP_COMMON_H_
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#define AOM_AOM_DSP_AOM_DSP_COMMON_H_
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#include "config/aom_config.h"
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#include "aom/aom_integer.h"
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#include "aom_ports/mem.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef MAX_SB_SIZE
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#define MAX_SB_SIZE 128
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#endif // ndef MAX_SB_SIZE
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#define AOMMIN(x, y) (((x) < (y)) ? (x) : (y))
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#define AOMMAX(x, y) (((x) > (y)) ? (x) : (y))
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#define IMPLIES(a, b) (!(a) || (b)) // Logical 'a implies b' (or 'a -> b')
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#define IS_POWER_OF_TWO(x) (((x) & ((x)-1)) == 0)
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/* Left shifting a negative value became undefined behavior in C99 (downgraded
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from merely implementation-defined in C89). This should still compile to the
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correct thing on any two's-complement machine, but avoid ubsan warnings.*/
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#define AOM_SIGNED_SHL(x, shift) ((x) * (((x)*0 + 1) << (shift)))
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// These can be used to give a hint about branch outcomes.
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// This can have an effect, even if your target processor has a
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// good branch predictor, as these hints can affect basic block
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// ordering by the compiler.
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#ifdef __GNUC__
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#define LIKELY(v) __builtin_expect(v, 1)
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#define UNLIKELY(v) __builtin_expect(v, 0)
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#else
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#define LIKELY(v) (v)
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#define UNLIKELY(v) (v)
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#endif
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typedef uint8_t qm_val_t;
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#define AOM_QM_BITS 5
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// Note:
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// tran_low_t is the datatype used for final transform coefficients.
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// tran_high_t is the datatype used for intermediate transform stages.
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typedef int64_t tran_high_t;
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typedef int32_t tran_low_t;
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static INLINE uint8_t clip_pixel(int val) {
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return (val > 255) ? 255 : (val < 0) ? 0 : val;
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}
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static INLINE int clamp(int value, int low, int high) {
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return value < low ? low : (value > high ? high : value);
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}
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static INLINE int64_t clamp64(int64_t value, int64_t low, int64_t high) {
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return value < low ? low : (value > high ? high : value);
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}
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static INLINE double fclamp(double value, double low, double high) {
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return value < low ? low : (value > high ? high : value);
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}
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static INLINE uint16_t clip_pixel_highbd(int val, int bd) {
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switch (bd) {
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case 8:
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default: return (uint16_t)clamp(val, 0, 255);
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case 10: return (uint16_t)clamp(val, 0, 1023);
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case 12: return (uint16_t)clamp(val, 0, 4095);
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}
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}
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// The result of this branchless code is equivalent to (value < 0 ? 0 : value)
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// or max(0, value) and might be faster in some cases.
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// Care should be taken since the behavior of right shifting signed type
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// negative value is undefined by C standards and implementation defined,
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static INLINE unsigned int negative_to_zero(int value) {
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return value & ~(value >> (sizeof(value) * 8 - 1));
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AOM_AOM_DSP_AOM_DSP_COMMON_H_
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