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)
154 lines
7 KiB
C
154 lines
7 KiB
C
// Copyright 2014 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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// Author: Djordje Pesut (djordje.pesut@imgtec.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_MIPS32)
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#include "../enc/cost.h"
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static int GetResidualCost(int ctx0, const VP8Residual* const res) {
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int temp0, temp1;
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int v_reg, ctx_reg;
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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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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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const int16_t* res_coeffs = res->coeffs;
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const int res_last = res->last;
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const int const_max_level = MAX_VARIABLE_LEVEL;
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const int const_2 = 2;
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const uint16_t** p_costs = &costs[n][0];
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const size_t inc_p_costs = NUM_CTX * sizeof(*p_costs);
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if (res->last < 0) {
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return VP8BitCost(0, p0);
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}
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__asm__ volatile (
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".set push \n\t"
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".set noreorder \n\t"
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"subu %[temp1], %[res_last], %[n] \n\t"
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"sll %[temp0], %[n], 1 \n\t"
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"blez %[temp1], 2f \n\t"
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" addu %[res_coeffs], %[res_coeffs], %[temp0] \n\t"
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"1: \n\t"
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"lh %[v_reg], 0(%[res_coeffs]) \n\t"
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"addiu %[n], %[n], 1 \n\t"
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"negu %[temp0], %[v_reg] \n\t"
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"slti %[temp1], %[v_reg], 0 \n\t"
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"movn %[v_reg], %[temp0], %[temp1] \n\t"
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"sltiu %[temp0], %[v_reg], 2 \n\t"
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"move %[ctx_reg], %[v_reg] \n\t"
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"movz %[ctx_reg], %[const_2], %[temp0] \n\t"
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"sll %[temp1], %[v_reg], 1 \n\t"
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"addu %[temp1], %[temp1], %[VP8LevelFixedCosts] \n\t"
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"lhu %[temp1], 0(%[temp1]) \n\t"
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"slt %[temp0], %[v_reg], %[const_max_level] \n\t"
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"movz %[v_reg], %[const_max_level], %[temp0] \n\t"
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"addu %[cost], %[cost], %[temp1] \n\t"
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"sll %[v_reg], %[v_reg], 1 \n\t"
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"sll %[ctx_reg], %[ctx_reg], 2 \n\t"
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"addu %[v_reg], %[v_reg], %[t] \n\t"
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"lhu %[temp0], 0(%[v_reg]) \n\t"
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"addu %[p_costs], %[p_costs], %[inc_p_costs] \n\t"
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"addu %[t], %[p_costs], %[ctx_reg] \n\t"
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"addu %[cost], %[cost], %[temp0] \n\t"
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"addiu %[res_coeffs], %[res_coeffs], 2 \n\t"
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"bne %[n], %[res_last], 1b \n\t"
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" lw %[t], 0(%[t]) \n\t"
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"2: \n\t"
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".set pop \n\t"
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: [cost]"+&r"(cost), [t]"+&r"(t), [n]"+&r"(n), [v_reg]"=&r"(v_reg),
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[ctx_reg]"=&r"(ctx_reg), [p_costs]"+&r"(p_costs), [temp0]"=&r"(temp0),
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[temp1]"=&r"(temp1), [res_coeffs]"+&r"(res_coeffs)
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: [const_2]"r"(const_2), [const_max_level]"r"(const_max_level),
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[VP8LevelFixedCosts]"r"(VP8LevelFixedCosts), [res_last]"r"(res_last),
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[inc_p_costs]"r"(inc_p_costs)
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: "memory"
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);
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// Last coefficient is always non-zero
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{
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const int v = abs(res->coeffs[n]);
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assert(v != 0);
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cost += VP8LevelCost(t, v);
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if (n < 15) {
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const int b = VP8EncBands[n + 1];
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const int ctx = (v == 1) ? 1 : 2;
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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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static void SetResidualCoeffs(const int16_t* const coeffs,
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VP8Residual* const res) {
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const int16_t* p_coeffs = (int16_t*)coeffs;
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int temp0, temp1, temp2, n, n1;
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assert(res->first == 0 || coeffs[0] == 0);
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__asm__ volatile (
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".set push \n\t"
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".set noreorder \n\t"
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"addiu %[p_coeffs], %[p_coeffs], 28 \n\t"
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"li %[n], 15 \n\t"
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"li %[temp2], -1 \n\t"
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"0: \n\t"
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"ulw %[temp0], 0(%[p_coeffs]) \n\t"
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"beqz %[temp0], 1f \n\t"
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#if defined(WORDS_BIGENDIAN)
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" sll %[temp1], %[temp0], 16 \n\t"
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#else
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" srl %[temp1], %[temp0], 16 \n\t"
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#endif
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"addiu %[n1], %[n], -1 \n\t"
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"movz %[temp0], %[n1], %[temp1] \n\t"
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"movn %[temp0], %[n], %[temp1] \n\t"
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"j 2f \n\t"
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" addiu %[temp2], %[temp0], 0 \n\t"
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"1: \n\t"
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"addiu %[n], %[n], -2 \n\t"
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"bgtz %[n], 0b \n\t"
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" addiu %[p_coeffs], %[p_coeffs], -4 \n\t"
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"2: \n\t"
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".set pop \n\t"
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: [p_coeffs]"+&r"(p_coeffs), [temp0]"=&r"(temp0),
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[temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
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[n]"=&r"(n), [n1]"=&r"(n1)
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:
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: "memory"
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);
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res->last = temp2;
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res->coeffs = coeffs;
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}
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//------------------------------------------------------------------------------
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// Entry point
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extern void VP8EncDspCostInitMIPS32(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPS32(void) {
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VP8GetResidualCost = GetResidualCost;
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VP8SetResidualCoeffs = SetResidualCoeffs;
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}
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#else // !WEBP_USE_MIPS32
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WEBP_DSP_INIT_STUB(VP8EncDspCostInitMIPS32)
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#endif // WEBP_USE_MIPS32
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