ee3cf211c6
Note that there are two Godot-specific changes made to libwebp for the javascript/HTML5 platform. They are documented in the README.md.
120 lines
4.3 KiB
C
120 lines
4.3 KiB
C
// Copyright 2015 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.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// SSE2 version of cost functions
|
|
//
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
|
|
|
#include "./dsp.h"
|
|
|
|
#if defined(WEBP_USE_SSE2)
|
|
#include <emmintrin.h>
|
|
|
|
#include "../enc/cost.h"
|
|
#include "../enc/vp8enci.h"
|
|
#include "../utils/utils.h"
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
static void SetResidualCoeffsSSE2(const int16_t* const coeffs,
|
|
VP8Residual* const res) {
|
|
const __m128i c0 = _mm_loadu_si128((const __m128i*)(coeffs + 0));
|
|
const __m128i c1 = _mm_loadu_si128((const __m128i*)(coeffs + 8));
|
|
// Use SSE2 to compare 16 values with a single instruction.
|
|
const __m128i zero = _mm_setzero_si128();
|
|
const __m128i m0 = _mm_packs_epi16(c0, c1);
|
|
const __m128i m1 = _mm_cmpeq_epi8(m0, zero);
|
|
// Get the comparison results as a bitmask into 16bits. Negate the mask to get
|
|
// the position of entries that are not equal to zero. We don't need to mask
|
|
// out least significant bits according to res->first, since coeffs[0] is 0
|
|
// if res->first > 0.
|
|
const uint32_t mask = 0x0000ffffu ^ (uint32_t)_mm_movemask_epi8(m1);
|
|
// The position of the most significant non-zero bit indicates the position of
|
|
// the last non-zero value.
|
|
assert(res->first == 0 || coeffs[0] == 0);
|
|
res->last = mask ? BitsLog2Floor(mask) : -1;
|
|
res->coeffs = coeffs;
|
|
}
|
|
|
|
static int GetResidualCostSSE2(int ctx0, const VP8Residual* const res) {
|
|
uint8_t levels[16], ctxs[16];
|
|
uint16_t abs_levels[16];
|
|
int n = res->first;
|
|
// should be prob[VP8EncBands[n]], but it's equivalent for n=0 or 1
|
|
const int p0 = res->prob[n][ctx0][0];
|
|
CostArrayPtr const costs = res->costs;
|
|
const uint16_t* t = costs[n][ctx0];
|
|
// bit_cost(1, p0) is already incorporated in t[] tables, but only if ctx != 0
|
|
// (as required by the syntax). For ctx0 == 0, we need to add it here or it'll
|
|
// be missing during the loop.
|
|
int cost = (ctx0 == 0) ? VP8BitCost(1, p0) : 0;
|
|
|
|
if (res->last < 0) {
|
|
return VP8BitCost(0, p0);
|
|
}
|
|
|
|
{ // precompute clamped levels and contexts, packed to 8b.
|
|
const __m128i zero = _mm_setzero_si128();
|
|
const __m128i kCst2 = _mm_set1_epi8(2);
|
|
const __m128i kCst67 = _mm_set1_epi8(MAX_VARIABLE_LEVEL);
|
|
const __m128i c0 = _mm_loadu_si128((const __m128i*)&res->coeffs[0]);
|
|
const __m128i c1 = _mm_loadu_si128((const __m128i*)&res->coeffs[8]);
|
|
const __m128i D0 = _mm_sub_epi16(zero, c0);
|
|
const __m128i D1 = _mm_sub_epi16(zero, c1);
|
|
const __m128i E0 = _mm_max_epi16(c0, D0); // abs(v), 16b
|
|
const __m128i E1 = _mm_max_epi16(c1, D1);
|
|
const __m128i F = _mm_packs_epi16(E0, E1);
|
|
const __m128i G = _mm_min_epu8(F, kCst2); // context = 0,1,2
|
|
const __m128i H = _mm_min_epu8(F, kCst67); // clamp_level in [0..67]
|
|
|
|
_mm_storeu_si128((__m128i*)&ctxs[0], G);
|
|
_mm_storeu_si128((__m128i*)&levels[0], H);
|
|
|
|
_mm_storeu_si128((__m128i*)&abs_levels[0], E0);
|
|
_mm_storeu_si128((__m128i*)&abs_levels[8], E1);
|
|
}
|
|
for (; n < res->last; ++n) {
|
|
const int ctx = ctxs[n];
|
|
const int level = levels[n];
|
|
const int flevel = abs_levels[n]; // full level
|
|
cost += VP8LevelFixedCosts[flevel] + t[level]; // simplified VP8LevelCost()
|
|
t = costs[n + 1][ctx];
|
|
}
|
|
// Last coefficient is always non-zero
|
|
{
|
|
const int level = levels[n];
|
|
const int flevel = abs_levels[n];
|
|
assert(flevel != 0);
|
|
cost += VP8LevelFixedCosts[flevel] + t[level];
|
|
if (n < 15) {
|
|
const int b = VP8EncBands[n + 1];
|
|
const int ctx = ctxs[n];
|
|
const int last_p0 = res->prob[b][ctx][0];
|
|
cost += VP8BitCost(0, last_p0);
|
|
}
|
|
}
|
|
return cost;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Entry point
|
|
|
|
extern void VP8EncDspCostInitSSE2(void);
|
|
|
|
WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitSSE2(void) {
|
|
VP8SetResidualCoeffs = SetResidualCoeffsSSE2;
|
|
VP8GetResidualCost = GetResidualCostSSE2;
|
|
}
|
|
|
|
#else // !WEBP_USE_SSE2
|
|
|
|
WEBP_DSP_INIT_STUB(VP8EncDspCostInitSSE2)
|
|
|
|
#endif // WEBP_USE_SSE2
|