mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-10 04:20:25 +00:00
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
|
// Copyright 2018 Google Inc. All Rights Reserved.
|
||
|
|
//
|
||
|
|
// Use of this source code is governed by a BSD-style license
|
||
|
|
// that can be found in the COPYING 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 WEBP_DSP_QUANT_H_
|
||
|
|
#define WEBP_DSP_QUANT_H_
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include "dsp_dsp.h"
|
||
|
|
#include "webp_types.h"
|
||
|
|
|
||
|
|
#if defined(WEBP_USE_NEON) && !defined(WEBP_ANDROID_NEON) && \
|
||
|
|
!defined(WEBP_HAVE_NEON_RTCD)
|
||
|
|
#include <arm_neon.h>
|
||
|
|
|
||
|
|
#define IsFlat IsFlat_NEON
|
||
|
|
|
||
|
|
static uint32x2_t horizontal_add_uint32x4(const uint32x4_t a) {
|
||
|
|
const uint64x2_t b = vpaddlq_u32(a);
|
||
|
|
return vadd_u32(vreinterpret_u32_u64(vget_low_u64(b)),
|
||
|
|
vreinterpret_u32_u64(vget_high_u64(b)));
|
||
|
|
}
|
||
|
|
|
||
|
|
static WEBP_INLINE int IsFlat(const int16_t* levels, int num_blocks,
|
||
|
|
int thresh) {
|
||
|
|
const int16x8_t tst_ones = vdupq_n_s16(-1);
|
||
|
|
uint32x4_t sum = vdupq_n_u32(0);
|
||
|
|
|
||
|
|
for (int i = 0; i < num_blocks; ++i) {
|
||
|
|
// Set DC to zero.
|
||
|
|
const int16x8_t a_0 = vsetq_lane_s16(0, vld1q_s16(levels), 0);
|
||
|
|
const int16x8_t a_1 = vld1q_s16(levels + 8);
|
||
|
|
|
||
|
|
const uint16x8_t b_0 = vshrq_n_u16(vtstq_s16(a_0, tst_ones), 15);
|
||
|
|
const uint16x8_t b_1 = vshrq_n_u16(vtstq_s16(a_1, tst_ones), 15);
|
||
|
|
|
||
|
|
sum = vpadalq_u16(sum, b_0);
|
||
|
|
sum = vpadalq_u16(sum, b_1);
|
||
|
|
|
||
|
|
levels += 16;
|
||
|
|
}
|
||
|
|
return thresh >= (int32_t)vget_lane_u32(horizontal_add_uint32x4(sum), 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define IsFlat IsFlat_C
|
||
|
|
|
||
|
|
static WEBP_INLINE int IsFlat(const int16_t* levels, int num_blocks,
|
||
|
|
int thresh) {
|
||
|
|
int score = 0;
|
||
|
|
while (num_blocks-- > 0) { // TODO(skal): refine positional scoring?
|
||
|
|
int i;
|
||
|
|
for (i = 1; i < 16; ++i) { // omit DC, we're only interested in AC
|
||
|
|
score += (levels[i] != 0);
|
||
|
|
if (score > thresh) return 0;
|
||
|
|
}
|
||
|
|
levels += 16;
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // defined(WEBP_USE_NEON) && !defined(WEBP_ANDROID_NEON) &&
|
||
|
|
// !defined(WEBP_HAVE_NEON_RTCD)
|
||
|
|
|
||
|
|
static WEBP_INLINE int IsFlatSource16(const uint8_t* src) {
|
||
|
|
const uint32_t v = src[0] * 0x01010101u;
|
||
|
|
int i;
|
||
|
|
for (i = 0; i < 16; ++i) {
|
||
|
|
if (memcmp(src + 0, &v, 4) || memcmp(src + 4, &v, 4) ||
|
||
|
|
memcmp(src + 8, &v, 4) || memcmp(src + 12, &v, 4)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
src += BPS;
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // WEBP_DSP_QUANT_H_
|