chromium/third_party/libvpx/source/libvpx/vpx_dsp/inv_txfm.h

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef VPX_VPX_DSP_INV_TXFM_H_
#define VPX_VPX_DSP_INV_TXFM_H_

#include <assert.h>

#include "./vpx_config.h"
#include "vpx_dsp/txfm_common.h"
#include "vpx_ports/mem.h"

#ifdef __cplusplus
extern "C" {
#endif

static INLINE tran_high_t check_range(tran_high_t input) { … }

static INLINE tran_high_t dct_const_round_shift(tran_high_t input) { … }

#if CONFIG_VP9_HIGHBITDEPTH
static INLINE tran_high_t highbd_check_range(tran_high_t input, int bd) { … }
#endif  // CONFIG_VP9_HIGHBITDEPTH

#if CONFIG_EMULATE_HARDWARE
// When CONFIG_EMULATE_HARDWARE is 1 the transform performs a
// non-normative method to handle overflows. A stream that causes
// overflows  in the inverse transform is considered invalid in VP9,
// and a hardware implementer is free to choose any reasonable
// method to handle overflows. However to aid in hardware
// verification they can use a specific implementation of the
// WRAPLOW() macro below that is identical to their intended
// hardware implementation (and also use configure options to trigger
// the C-implementation of the transform).
//
// The particular WRAPLOW implementation below performs strict
// overflow wrapping to match common hardware implementations.
// bd of 8 uses trans_low with 16bits, need to remove 16bits
// bd of 10 uses trans_low with 18bits, need to remove 14bits
// bd of 12 uses trans_low with 20bits, need to remove 12bits
// bd of x uses trans_low with 8+x bits, need to remove 24-x bits
#define WRAPLOW …
#if CONFIG_VP9_HIGHBITDEPTH
#define HIGHBD_WRAPLOW …
#endif  // CONFIG_VP9_HIGHBITDEPTH

#else  // CONFIG_EMULATE_HARDWARE

#define WRAPLOW(x) …
#if CONFIG_VP9_HIGHBITDEPTH
#define HIGHBD_WRAPLOW(x, bd) …
#endif  // CONFIG_VP9_HIGHBITDEPTH
#endif  // CONFIG_EMULATE_HARDWARE

void idct4_c(const tran_low_t *input, tran_low_t *output);
void idct8_c(const tran_low_t *input, tran_low_t *output);
void idct16_c(const tran_low_t *input, tran_low_t *output);
void idct32_c(const tran_low_t *input, tran_low_t *output);
void iadst4_c(const tran_low_t *input, tran_low_t *output);
void iadst8_c(const tran_low_t *input, tran_low_t *output);
void iadst16_c(const tran_low_t *input, tran_low_t *output);

#if CONFIG_VP9_HIGHBITDEPTH
void vpx_highbd_idct4_c(const tran_low_t *input, tran_low_t *output, int bd);
void vpx_highbd_idct8_c(const tran_low_t *input, tran_low_t *output, int bd);
void vpx_highbd_idct16_c(const tran_low_t *input, tran_low_t *output, int bd);

void vpx_highbd_iadst4_c(const tran_low_t *input, tran_low_t *output, int bd);
void vpx_highbd_iadst8_c(const tran_low_t *input, tran_low_t *output, int bd);
void vpx_highbd_iadst16_c(const tran_low_t *input, tran_low_t *output, int bd);

static INLINE uint16_t highbd_clip_pixel_add(uint16_t dest, tran_high_t trans,
                                             int bd) { … }
#endif

static INLINE uint8_t clip_pixel_add(uint8_t dest, tran_high_t trans) { … }
#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VPX_VPX_DSP_INV_TXFM_H_