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// 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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// Spatial prediction using various filters
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//
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// Author(s): Branimir Vasic (branimir.vasic@imgtec.com)
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// Djordje Pesut (djordje.pesut@imgtec.com)
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#include "src/dsp/dsp.h"
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#if defined(WEBP_USE_MIPS_DSP_R2)
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#include "src/dsp/dsp.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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//------------------------------------------------------------------------------
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// Helpful macro.
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# define SANITY_CHECK(in, out) \
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assert(in != NULL); \
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assert(out != NULL); \
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assert(width > 0); \
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assert(height > 0); \
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assert(stride >= width); \
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assert(row >= 0 && num_rows > 0 && row + num_rows <= height); \
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(void)height; // Silence unused warning.
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#define DO_PREDICT_LINE(SRC, DST, LENGTH, INVERSE) do { \
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const uint8_t* psrc = (uint8_t*)(SRC); \
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uint8_t* pdst = (uint8_t*)(DST); \
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const int ilength = (int)(LENGTH); \
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int temp0, temp1, temp2, temp3, temp4, temp5, temp6; \
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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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"srl %[temp0], %[length], 2 \n\t" \
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"beqz %[temp0], 4f \n\t" \
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" andi %[temp6], %[length], 3 \n\t" \
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".if " #INVERSE " \n\t" \
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"1: \n\t" \
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"lbu %[temp1], -1(%[dst]) \n\t" \
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"lbu %[temp2], 0(%[src]) \n\t" \
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"lbu %[temp3], 1(%[src]) \n\t" \
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"lbu %[temp4], 2(%[src]) \n\t" \
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"lbu %[temp5], 3(%[src]) \n\t" \
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"addu %[temp1], %[temp1], %[temp2] \n\t" \
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"addu %[temp2], %[temp1], %[temp3] \n\t" \
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"addu %[temp3], %[temp2], %[temp4] \n\t" \
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"addu %[temp4], %[temp3], %[temp5] \n\t" \
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"sb %[temp1], 0(%[dst]) \n\t" \
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"sb %[temp2], 1(%[dst]) \n\t" \
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"sb %[temp3], 2(%[dst]) \n\t" \
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"sb %[temp4], 3(%[dst]) \n\t" \
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"addiu %[src], %[src], 4 \n\t" \
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"addiu %[temp0], %[temp0], -1 \n\t" \
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"bnez %[temp0], 1b \n\t" \
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" addiu %[dst], %[dst], 4 \n\t" \
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".else \n\t" \
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"1: \n\t" \
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"ulw %[temp1], -1(%[src]) \n\t" \
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"ulw %[temp2], 0(%[src]) \n\t" \
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"addiu %[src], %[src], 4 \n\t" \
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"addiu %[temp0], %[temp0], -1 \n\t" \
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"subu.qb %[temp3], %[temp2], %[temp1] \n\t" \
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"usw %[temp3], 0(%[dst]) \n\t" \
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"bnez %[temp0], 1b \n\t" \
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" addiu %[dst], %[dst], 4 \n\t" \
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".endif \n\t" \
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"4: \n\t" \
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"beqz %[temp6], 3f \n\t" \
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" nop \n\t" \
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"2: \n\t" \
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"lbu %[temp2], 0(%[src]) \n\t" \
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".if " #INVERSE " \n\t" \
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"lbu %[temp1], -1(%[dst]) \n\t" \
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"addu %[temp3], %[temp1], %[temp2] \n\t" \
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".else \n\t" \
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"lbu %[temp1], -1(%[src]) \n\t" \
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"subu %[temp3], %[temp1], %[temp2] \n\t" \
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".endif \n\t" \
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"addiu %[src], %[src], 1 \n\t" \
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"sb %[temp3], 0(%[dst]) \n\t" \
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"addiu %[temp6], %[temp6], -1 \n\t" \
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"bnez %[temp6], 2b \n\t" \
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" addiu %[dst], %[dst], 1 \n\t" \
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"3: \n\t" \
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".set pop \n\t" \
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: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), \
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[temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), \
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[temp6]"=&r"(temp6), [dst]"+&r"(pdst), [src]"+&r"(psrc) \
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: [length]"r"(ilength) \
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: "memory" \
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); \
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} while (0)
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static WEBP_INLINE void PredictLine_MIPSdspR2(const uint8_t* src, uint8_t* dst,
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int length) {
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DO_PREDICT_LINE(src, dst, length, 0);
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}
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#define DO_PREDICT_LINE_VERTICAL(SRC, PRED, DST, LENGTH, INVERSE) do { \
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const uint8_t* psrc = (uint8_t*)(SRC); \
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const uint8_t* ppred = (uint8_t*)(PRED); \
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uint8_t* pdst = (uint8_t*)(DST); \
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const int ilength = (int)(LENGTH); \
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int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7; \
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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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"srl %[temp0], %[length], 0x3 \n\t" \
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"beqz %[temp0], 4f \n\t" \
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" andi %[temp7], %[length], 0x7 \n\t" \
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"1: \n\t" \
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"ulw %[temp1], 0(%[src]) \n\t" \
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"ulw %[temp2], 0(%[pred]) \n\t" \
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"ulw %[temp3], 4(%[src]) \n\t" \
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"ulw %[temp4], 4(%[pred]) \n\t" \
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"addiu %[src], %[src], 8 \n\t" \
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".if " #INVERSE " \n\t" \
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"addu.qb %[temp5], %[temp1], %[temp2] \n\t" \
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"addu.qb %[temp6], %[temp3], %[temp4] \n\t" \
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".else \n\t" \
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"subu.qb %[temp5], %[temp1], %[temp2] \n\t" \
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"subu.qb %[temp6], %[temp3], %[temp4] \n\t" \
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".endif \n\t" \
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"addiu %[pred], %[pred], 8 \n\t" \
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"usw %[temp5], 0(%[dst]) \n\t" \
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"usw %[temp6], 4(%[dst]) \n\t" \
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"addiu %[temp0], %[temp0], -1 \n\t" \
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"bnez %[temp0], 1b \n\t" \
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" addiu %[dst], %[dst], 8 \n\t" \
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"4: \n\t" \
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"beqz %[temp7], 3f \n\t" \
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" nop \n\t" \
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"2: \n\t" \
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"lbu %[temp1], 0(%[src]) \n\t" \
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"lbu %[temp2], 0(%[pred]) \n\t" \
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"addiu %[src], %[src], 1 \n\t" \
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"addiu %[pred], %[pred], 1 \n\t" \
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".if " #INVERSE " \n\t" \
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"addu %[temp3], %[temp1], %[temp2] \n\t" \
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".else \n\t" \
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"subu %[temp3], %[temp1], %[temp2] \n\t" \
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".endif \n\t" \
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"sb %[temp3], 0(%[dst]) \n\t" \
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"addiu %[temp7], %[temp7], -1 \n\t" \
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"bnez %[temp7], 2b \n\t" \
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" addiu %[dst], %[dst], 1 \n\t" \
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"3: \n\t" \
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".set pop \n\t" \
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: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), \
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[temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), \
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[temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [pred]"+&r"(ppred), \
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[dst]"+&r"(pdst), [src]"+&r"(psrc) \
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: [length]"r"(ilength) \
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: "memory" \
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); \
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} while (0)
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#define PREDICT_LINE_ONE_PASS(SRC, PRED, DST) do { \
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int temp1, temp2, temp3; \
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__asm__ volatile ( \
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"lbu %[temp1], 0(%[src]) \n\t" \
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"lbu %[temp2], 0(%[pred]) \n\t" \
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"subu %[temp3], %[temp1], %[temp2] \n\t" \
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"sb %[temp3], 0(%[dst]) \n\t" \
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: [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), [temp3]"=&r"(temp3) \
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: [pred]"r"((PRED)), [dst]"r"((DST)), [src]"r"((SRC)) \
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: "memory" \
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); \
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} while (0)
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//------------------------------------------------------------------------------
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// Horizontal filter.
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#define FILTER_LINE_BY_LINE do { \
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while (row < last_row) { \
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PREDICT_LINE_ONE_PASS(in, preds - stride, out); \
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DO_PREDICT_LINE(in + 1, out + 1, width - 1, 0); \
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++row; \
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preds += stride; \
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in += stride; \
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out += stride; \
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} \
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} while (0)
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static WEBP_INLINE void DoHorizontalFilter_MIPSdspR2(const uint8_t* in,
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int width, int height,
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int stride,
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int row, int num_rows,
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uint8_t* out) {
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const uint8_t* preds;
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const size_t start_offset = row * stride;
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const int last_row = row + num_rows;
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SANITY_CHECK(in, out);
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in += start_offset;
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out += start_offset;
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preds = in;
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if (row == 0) {
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// Leftmost pixel is the same as input for topmost scanline.
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out[0] = in[0];
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PredictLine_MIPSdspR2(in + 1, out + 1, width - 1);
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row = 1;
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preds += stride;
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in += stride;
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out += stride;
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}
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// Filter line-by-line.
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FILTER_LINE_BY_LINE;
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}
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#undef FILTER_LINE_BY_LINE
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static void HorizontalFilter_MIPSdspR2(const uint8_t* data,
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int width, int height,
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int stride, uint8_t* filtered_data) {
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DoHorizontalFilter_MIPSdspR2(data, width, height, stride, 0, height,
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filtered_data);
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}
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//------------------------------------------------------------------------------
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// Vertical filter.
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#define FILTER_LINE_BY_LINE do { \
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while (row < last_row) { \
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DO_PREDICT_LINE_VERTICAL(in, preds, out, width, 0); \
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++row; \
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preds += stride; \
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in += stride; \
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out += stride; \
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} \
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} while (0)
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static WEBP_INLINE void DoVerticalFilter_MIPSdspR2(const uint8_t* in,
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int width, int height,
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int stride,
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int row, int num_rows,
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uint8_t* out) {
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const uint8_t* preds;
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const size_t start_offset = row * stride;
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const int last_row = row + num_rows;
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SANITY_CHECK(in, out);
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9c6abc |
in += start_offset;
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9c6abc |
out += start_offset;
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9c6abc |
preds = in;
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Packit |
9c6abc |
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Packit |
9c6abc |
if (row == 0) {
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Packit |
9c6abc |
// Very first top-left pixel is copied.
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9c6abc |
out[0] = in[0];
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Packit |
9c6abc |
// Rest of top scan-line is left-predicted.
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Packit |
9c6abc |
PredictLine_MIPSdspR2(in + 1, out + 1, width - 1);
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9c6abc |
row = 1;
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9c6abc |
in += stride;
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9c6abc |
out += stride;
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9c6abc |
} else {
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Packit |
9c6abc |
// We are starting from in-between. Make sure 'preds' points to prev row.
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9c6abc |
preds -= stride;
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9c6abc |
}
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Packit |
9c6abc |
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9c6abc |
// Filter line-by-line.
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9c6abc |
FILTER_LINE_BY_LINE;
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9c6abc |
}
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Packit |
9c6abc |
#undef FILTER_LINE_BY_LINE
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static void VerticalFilter_MIPSdspR2(const uint8_t* data, int width, int height,
|
|
Packit |
9c6abc |
int stride, uint8_t* filtered_data) {
|
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Packit |
9c6abc |
DoVerticalFilter_MIPSdspR2(data, width, height, stride, 0, height,
|
|
Packit |
9c6abc |
filtered_data);
|
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9c6abc |
}
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Packit |
9c6abc |
|
|
Packit |
9c6abc |
//------------------------------------------------------------------------------
|
|
Packit |
9c6abc |
// Gradient filter.
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static int GradientPredictor_MIPSdspR2(uint8_t a, uint8_t b, uint8_t c) {
|
|
Packit |
9c6abc |
int temp0;
|
|
Packit |
9c6abc |
__asm__ volatile (
|
|
Packit |
9c6abc |
"addu %[temp0], %[a], %[b] \n\t"
|
|
Packit |
9c6abc |
"subu %[temp0], %[temp0], %[c] \n\t"
|
|
Packit |
9c6abc |
"shll_s.w %[temp0], %[temp0], 23 \n\t"
|
|
Packit |
9c6abc |
"precrqu_s.qb.ph %[temp0], %[temp0], $zero \n\t"
|
|
Packit |
9c6abc |
"srl %[temp0], %[temp0], 24 \n\t"
|
|
Packit |
9c6abc |
: [temp0]"=&r"(temp0)
|
|
Packit |
9c6abc |
: [a]"r"(a),[b]"r"(b),[c]"r"(c)
|
|
Packit |
9c6abc |
);
|
|
Packit |
9c6abc |
return temp0;
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
#define FILTER_LINE_BY_LINE(PREDS, OPERATION) do { \
|
|
Packit |
9c6abc |
while (row < last_row) { \
|
|
Packit |
9c6abc |
int w; \
|
|
Packit |
9c6abc |
PREDICT_LINE_ONE_PASS(in, PREDS - stride, out); \
|
|
Packit |
9c6abc |
for (w = 1; w < width; ++w) { \
|
|
Packit |
9c6abc |
const int pred = GradientPredictor_MIPSdspR2(PREDS[w - 1], \
|
|
Packit |
9c6abc |
PREDS[w - stride], \
|
|
Packit |
9c6abc |
PREDS[w - stride - 1]); \
|
|
Packit |
9c6abc |
out[w] = in[w] OPERATION pred; \
|
|
Packit |
9c6abc |
} \
|
|
Packit |
9c6abc |
++row; \
|
|
Packit |
9c6abc |
in += stride; \
|
|
Packit |
9c6abc |
out += stride; \
|
|
Packit |
9c6abc |
} \
|
|
Packit |
9c6abc |
} while (0)
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static void DoGradientFilter_MIPSdspR2(const uint8_t* in,
|
|
Packit |
9c6abc |
int width, int height, int stride,
|
|
Packit |
9c6abc |
int row, int num_rows, uint8_t* out) {
|
|
Packit |
9c6abc |
const uint8_t* preds;
|
|
Packit |
9c6abc |
const size_t start_offset = row * stride;
|
|
Packit |
9c6abc |
const int last_row = row + num_rows;
|
|
Packit |
9c6abc |
SANITY_CHECK(in, out);
|
|
Packit |
9c6abc |
in += start_offset;
|
|
Packit |
9c6abc |
out += start_offset;
|
|
Packit |
9c6abc |
preds = in;
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
// left prediction for top scan-line
|
|
Packit |
9c6abc |
if (row == 0) {
|
|
Packit |
9c6abc |
out[0] = in[0];
|
|
Packit |
9c6abc |
PredictLine_MIPSdspR2(in + 1, out + 1, width - 1);
|
|
Packit |
9c6abc |
row = 1;
|
|
Packit |
9c6abc |
preds += stride;
|
|
Packit |
9c6abc |
in += stride;
|
|
Packit |
9c6abc |
out += stride;
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
// Filter line-by-line.
|
|
Packit |
9c6abc |
FILTER_LINE_BY_LINE(in, -);
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
#undef FILTER_LINE_BY_LINE
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static void GradientFilter_MIPSdspR2(const uint8_t* data, int width, int height,
|
|
Packit |
9c6abc |
int stride, uint8_t* filtered_data) {
|
|
Packit |
9c6abc |
DoGradientFilter_MIPSdspR2(data, width, height, stride, 0, height,
|
|
Packit |
9c6abc |
filtered_data);
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
//------------------------------------------------------------------------------
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static void HorizontalUnfilter_MIPSdspR2(const uint8_t* prev, const uint8_t* in,
|
|
Packit |
9c6abc |
uint8_t* out, int width) {
|
|
Packit |
9c6abc |
out[0] = in[0] + (prev == NULL ? 0 : prev[0]);
|
|
Packit |
9c6abc |
DO_PREDICT_LINE(in + 1, out + 1, width - 1, 1);
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static void VerticalUnfilter_MIPSdspR2(const uint8_t* prev, const uint8_t* in,
|
|
Packit |
9c6abc |
uint8_t* out, int width) {
|
|
Packit |
9c6abc |
if (prev == NULL) {
|
|
Packit |
9c6abc |
HorizontalUnfilter_MIPSdspR2(NULL, in, out, width);
|
|
Packit |
9c6abc |
} else {
|
|
Packit |
9c6abc |
DO_PREDICT_LINE_VERTICAL(in, prev, out, width, 1);
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
static void GradientUnfilter_MIPSdspR2(const uint8_t* prev, const uint8_t* in,
|
|
Packit |
9c6abc |
uint8_t* out, int width) {
|
|
Packit |
9c6abc |
if (prev == NULL) {
|
|
Packit |
9c6abc |
HorizontalUnfilter_MIPSdspR2(NULL, in, out, width);
|
|
Packit |
9c6abc |
} else {
|
|
Packit |
9c6abc |
uint8_t top = prev[0], top_left = top, left = top;
|
|
Packit |
9c6abc |
int i;
|
|
Packit |
9c6abc |
for (i = 0; i < width; ++i) {
|
|
Packit |
9c6abc |
top = prev[i]; // need to read this first, in case prev==dst
|
|
Packit |
9c6abc |
left = in[i] + GradientPredictor_MIPSdspR2(left, top, top_left);
|
|
Packit |
9c6abc |
top_left = top;
|
|
Packit |
9c6abc |
out[i] = left;
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
#undef DO_PREDICT_LINE_VERTICAL
|
|
Packit |
9c6abc |
#undef PREDICT_LINE_ONE_PASS
|
|
Packit |
9c6abc |
#undef DO_PREDICT_LINE
|
|
Packit |
9c6abc |
#undef SANITY_CHECK
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
//------------------------------------------------------------------------------
|
|
Packit |
9c6abc |
// Entry point
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
extern void VP8FiltersInitMIPSdspR2(void);
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitMIPSdspR2(void) {
|
|
Packit |
9c6abc |
WebPUnfilters[WEBP_FILTER_HORIZONTAL] = HorizontalUnfilter_MIPSdspR2;
|
|
Packit |
9c6abc |
WebPUnfilters[WEBP_FILTER_VERTICAL] = VerticalUnfilter_MIPSdspR2;
|
|
Packit |
9c6abc |
WebPUnfilters[WEBP_FILTER_GRADIENT] = GradientUnfilter_MIPSdspR2;
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
WebPFilters[WEBP_FILTER_HORIZONTAL] = HorizontalFilter_MIPSdspR2;
|
|
Packit |
9c6abc |
WebPFilters[WEBP_FILTER_VERTICAL] = VerticalFilter_MIPSdspR2;
|
|
Packit |
9c6abc |
WebPFilters[WEBP_FILTER_GRADIENT] = GradientFilter_MIPSdspR2;
|
|
Packit |
9c6abc |
}
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
#else // !WEBP_USE_MIPS_DSP_R2
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
WEBP_DSP_INIT_STUB(VP8FiltersInitMIPSdspR2)
|
|
Packit |
9c6abc |
|
|
Packit |
9c6abc |
#endif // WEBP_USE_MIPS_DSP_R2
|