55414bc573
Note that there are two Godot-specific changes made to libwebp
for the javascript/HTML5 platform. They are documented in the
README.md.
(cherry picked from commit ee3cf211c6)
119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// SSE2 version of cost functions
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_SSE2)
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#include <emmintrin.h>
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#include "../enc/cost.h"
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#include "../enc/vp8enci.h"
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#include "../utils/utils.h"
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//------------------------------------------------------------------------------
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static void SetResidualCoeffsSSE2(const int16_t* const coeffs,
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VP8Residual* const res) {
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const __m128i c0 = _mm_loadu_si128((const __m128i*)(coeffs + 0));
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const __m128i c1 = _mm_loadu_si128((const __m128i*)(coeffs + 8));
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// Use SSE2 to compare 16 values with a single instruction.
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const __m128i zero = _mm_setzero_si128();
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const __m128i m0 = _mm_packs_epi16(c0, c1);
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const __m128i m1 = _mm_cmpeq_epi8(m0, zero);
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// Get the comparison results as a bitmask into 16bits. Negate the mask to get
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// the position of entries that are not equal to zero. We don't need to mask
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// out least significant bits according to res->first, since coeffs[0] is 0
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// if res->first > 0.
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const uint32_t mask = 0x0000ffffu ^ (uint32_t)_mm_movemask_epi8(m1);
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// The position of the most significant non-zero bit indicates the position of
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// the last non-zero value.
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assert(res->first == 0 || coeffs[0] == 0);
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res->last = mask ? BitsLog2Floor(mask) : -1;
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res->coeffs = coeffs;
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}
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static int GetResidualCostSSE2(int ctx0, const VP8Residual* const res) {
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uint8_t levels[16], ctxs[16];
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uint16_t abs_levels[16];
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int n = res->first;
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// should be prob[VP8EncBands[n]], but it's equivalent for n=0 or 1
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const int p0 = res->prob[n][ctx0][0];
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CostArrayPtr const costs = res->costs;
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const uint16_t* t = costs[n][ctx0];
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// bit_cost(1, p0) is already incorporated in t[] tables, but only if ctx != 0
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// (as required by the syntax). For ctx0 == 0, we need to add it here or it'll
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// be missing during the loop.
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int cost = (ctx0 == 0) ? VP8BitCost(1, p0) : 0;
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if (res->last < 0) {
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return VP8BitCost(0, p0);
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}
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{ // precompute clamped levels and contexts, packed to 8b.
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const __m128i zero = _mm_setzero_si128();
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const __m128i kCst2 = _mm_set1_epi8(2);
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const __m128i kCst67 = _mm_set1_epi8(MAX_VARIABLE_LEVEL);
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const __m128i c0 = _mm_loadu_si128((const __m128i*)&res->coeffs[0]);
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const __m128i c1 = _mm_loadu_si128((const __m128i*)&res->coeffs[8]);
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const __m128i D0 = _mm_sub_epi16(zero, c0);
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const __m128i D1 = _mm_sub_epi16(zero, c1);
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const __m128i E0 = _mm_max_epi16(c0, D0); // abs(v), 16b
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const __m128i E1 = _mm_max_epi16(c1, D1);
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const __m128i F = _mm_packs_epi16(E0, E1);
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const __m128i G = _mm_min_epu8(F, kCst2); // context = 0,1,2
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const __m128i H = _mm_min_epu8(F, kCst67); // clamp_level in [0..67]
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_mm_storeu_si128((__m128i*)&ctxs[0], G);
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_mm_storeu_si128((__m128i*)&levels[0], H);
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_mm_storeu_si128((__m128i*)&abs_levels[0], E0);
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_mm_storeu_si128((__m128i*)&abs_levels[8], E1);
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}
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for (; n < res->last; ++n) {
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const int ctx = ctxs[n];
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const int level = levels[n];
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const int flevel = abs_levels[n]; // full level
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cost += VP8LevelFixedCosts[flevel] + t[level]; // simplified VP8LevelCost()
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t = costs[n + 1][ctx];
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}
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// Last coefficient is always non-zero
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{
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const int level = levels[n];
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const int flevel = abs_levels[n];
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assert(flevel != 0);
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cost += VP8LevelFixedCosts[flevel] + t[level];
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if (n < 15) {
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const int b = VP8EncBands[n + 1];
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const int ctx = ctxs[n];
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const int last_p0 = res->prob[b][ctx][0];
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cost += VP8BitCost(0, last_p0);
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}
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}
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return cost;
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}
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//------------------------------------------------------------------------------
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// Entry point
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extern void VP8EncDspCostInitSSE2(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitSSE2(void) {
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VP8SetResidualCoeffs = SetResidualCoeffsSSE2;
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VP8GetResidualCost = GetResidualCostSSE2;
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}
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#else // !WEBP_USE_SSE2
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WEBP_DSP_INIT_STUB(VP8EncDspCostInitSSE2)
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#endif // WEBP_USE_SSE2
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