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MIPS: dspr2: added optimization for EmitAlphaRGB

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New dsp function: WebPDispatchAlpha()

Change-Id: I48e539d22471279ec75185759bc68d18b127f716
This commit is contained in:
Djordje Pesut 2014-08-21 19:26:18 +02:00 committed by skal
parent 953acd56a4
commit 0b21c30b1a
8 changed files with 131 additions and 13 deletions
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1
Android.mk
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@ -33,6 +33,7 @@ LOCAL_SRC_FILES := \
src/dec/vp8l.c \
src/dec/webp.c \
src/dsp/alpha_processing.c \
src/dsp/alpha_processing_mips_dsp_r2.c \
src/dsp/cpu.c \
src/dsp/dec.c \
src/dsp/dec_clip_tables.c \

1
Makefile.vc
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@ -172,6 +172,7 @@ DEMUX_OBJS = \
DSP_DEC_OBJS = \
$(DIROBJ)\dsp\alpha_processing.obj \
$(DIROBJ)\dsp\alpha_processing_mips_dsp_r2.obj \
$(DIROBJ)\dsp\cpu.obj \
$(DIROBJ)\dsp\dec.obj \
$(DIROBJ)\dsp\dec_clip_tables.obj \

1
makefile.unix
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@ -108,6 +108,7 @@ DEMUX_OBJS = \
DSP_DEC_OBJS = \
src/dsp/alpha_processing.o \
src/dsp/alpha_processing_mips_dsp_r2.o \
src/dsp/cpu.o \
src/dsp/dec.o \
src/dsp/dec_clip_tables.o \

17
src/dec/io.c
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@ -206,21 +206,12 @@ static int EmitAlphaRGB(const VP8Io* const io, WebPDecParams* const p) {
int num_rows;
const int start_y = GetAlphaSourceRow(io, &alpha, &num_rows);
uint8_t* const base_rgba = buf->rgba + start_y * buf->stride;
uint8_t* dst = base_rgba + (alpha_first ? 0 : 3);
uint32_t alpha_mask = 0xff;
int i, j;
uint8_t* const dst = base_rgba + (alpha_first ? 0 : 3);
const int has_alpha = WebPDispatchAlpha(alpha, io->width, mb_w,
num_rows, dst, buf->stride);
for (j = 0; j < num_rows; ++j) {
for (i = 0; i < mb_w; ++i) {
const uint32_t alpha_value = alpha[i];
dst[4 * i] = alpha_value;
alpha_mask &= alpha_value;
}
alpha += io->width;
dst += buf->stride;
}
// alpha_mask is < 0xff if there's non-trivial alpha to premultiply with.
if (alpha_mask != 0xff && WebPIsPremultipliedMode(colorspace)) {
if (has_alpha && WebPIsPremultipliedMode(colorspace)) {
WebPApplyAlphaMultiply(base_rgba, alpha_first,
mb_w, num_rows, buf->stride);
}

1
src/dsp/Makefile.am
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@ -10,6 +10,7 @@ commondir = $(includedir)/webp
COMMON_SOURCES =
COMMON_SOURCES += alpha_processing.c
COMMON_SOURCES += alpha_processing_mips_dsp_r2.c
COMMON_SOURCES += cpu.c
COMMON_SOURCES += dec.c
COMMON_SOURCES += dec_clip_tables.c

23
src/dsp/alpha_processing.c
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@ -284,25 +284,48 @@ static void ApplyAlphaMultiply_16b(uint8_t* rgba4444,
#endif
}
static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint8_t* dst, int dst_stride) {
uint32_t alpha_mask = 0xff;
int i, j;
for (j = 0; j < height; ++j) {
for (i = 0; i < width; ++i) {
const uint32_t alpha_value = alpha[i];
dst[4 * i] = alpha_value;
alpha_mask &= alpha_value;
}
alpha += alpha_stride;
dst += dst_stride;
}
return (alpha_mask != 0xff);
}
void (*WebPApplyAlphaMultiply)(uint8_t*, int, int, int, int);
void (*WebPApplyAlphaMultiply4444)(uint8_t*, int, int, int);
int (*WebPDispatchAlpha)(const uint8_t*, int, int, int, uint8_t*, int);
//------------------------------------------------------------------------------
// Init function
extern void VP8FiltersInitMIPSdspR2(void);
extern void WebPInitAlphaProcessingMIPSdspR2(void);
void WebPInitAlphaProcessing(void) {
WebPMultARGBRow = MultARGBRow;
WebPMultRow = MultRow;
WebPApplyAlphaMultiply = ApplyAlphaMultiply;
WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply_16b;
WebPDispatchAlpha = DispatchAlpha;
// If defined, use CPUInfo() to overwrite some pointers with faster versions.
if (VP8GetCPUInfo != NULL) {
#if defined(WEBP_USE_MIPS_DSP_R2)
if (VP8GetCPUInfo(kMIPSdspR2)) {
VP8FiltersInitMIPSdspR2();
WebPInitAlphaProcessingMIPSdspR2();
}
#endif
}

93
src/dsp/alpha_processing_mips_dsp_r2.c Normal file
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@ -0,0 +1,93 @@
// Copyright 2014 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.
// -----------------------------------------------------------------------------
//
// Utilities for processing transparent channel.
//
// Author(s): Branimir Vasic (branimir.vasic@imgtec.com)
// Djordje Pesut (djordje.pesut@imgtec.com)
#include "./dsp.h"
#if defined(WEBP_USE_MIPS_DSP_R2)
static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint8_t* dst, int dst_stride) {
uint32_t alpha_mask = 0xffffffff;
int i, j, temp0;
for (j = 0; j < height; ++j) {
uint8_t* pdst = dst;
const uint8_t* palpha = alpha;
for (i = 0; i < (width >> 2); ++i) {
int temp1, temp2, temp3;
__asm__ volatile (
"ulw %[temp0], 0(%[palpha]) \n\t"
"addiu %[palpha], %[palpha], 4 \n\t"
"addiu %[pdst], %[pdst], 16 \n\t"
"srl %[temp1], %[temp0], 8 \n\t"
"srl %[temp2], %[temp0], 16 \n\t"
"srl %[temp3], %[temp0], 24 \n\t"
"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
"sb %[temp0], -16(%[pdst]) \n\t"
"sb %[temp1], -12(%[pdst]) \n\t"
"sb %[temp2], -8(%[pdst]) \n\t"
"sb %[temp3], -4(%[pdst]) \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
[temp3]"=&r"(temp3), [palpha]"+r"(palpha), [pdst]"+r"(pdst),
[alpha_mask]"+r"(alpha_mask)
:
: "memory"
);
}
for (i = 0; i < (width & 3); ++i) {
__asm__ volatile (
"lbu %[temp0], 0(%[palpha]) \n\t"
"addiu %[palpha], %[palpha], 1 \n\t"
"sb %[temp0], 0(%[pdst]) \n\t"
"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
"addiu %[pdst], %[pdst], 4 \n\t"
: [temp0]"=&r"(temp0), [palpha]"+r"(palpha), [pdst]"+r"(pdst),
[alpha_mask]"+r"(alpha_mask)
:
: "memory"
);
}
alpha += alpha_stride;
dst += dst_stride;
}
__asm__ volatile (
"ext %[temp0], %[alpha_mask], 0, 16 \n\t"
"srl %[alpha_mask], %[alpha_mask], 16 \n\t"
"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
"ext %[temp0], %[alpha_mask], 0, 8 \n\t"
"srl %[alpha_mask], %[alpha_mask], 8 \n\t"
"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
: [temp0]"=&r"(temp0), [alpha_mask]"+r"(alpha_mask)
:
);
return (alpha_mask != 0xff);
}
#endif // WEBP_USE_MIPS_DSP_R2
//------------------------------------------------------------------------------
// Init function
extern void WebPInitAlphaProcessingMIPSdspR2(void);
void WebPInitAlphaProcessingMIPSdspR2(void) {
#if defined(WEBP_USE_MIPS_DSP_R2)
WebPDispatchAlpha = DispatchAlpha;
#endif
}

7
src/dsp/dsp.h
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@ -251,6 +251,13 @@ extern void (*WebPApplyAlphaMultiply)(
extern void (*WebPApplyAlphaMultiply4444)(
uint8_t* rgba4444, int w, int h, int stride);
// Dispatch the values from alpha[] plane to the ARGB destination 'dst'.
// Returns true if alpha[] plane has non-trivial values different from 0xff.
extern int (*WebPDispatchAlpha)(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint8_t* dst, int dst_stride);
// Pre-Multiply operation transforms x into x * A / 255 (where x=Y,R,G or B).
// Un-Multiply operation transforms x into x * 255 / A.