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// 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);
}
static void MultARGBRow(uint32_t* const ptr, int width, int inverse) {
int x;
const uint32_t c_00ffffff = 0x00ffffffu;
const uint32_t c_ff000000 = 0xff000000u;
const uint32_t c_8000000 = 0x00800000u;
const uint32_t c_8000080 = 0x00800080u;
for (x = 0; x < width; ++x) {
const uint32_t argb = ptr[x];
if (argb < 0xff000000u) { // alpha < 255
if (argb <= 0x00ffffffu) { // alpha == 0
ptr[x] = 0;
} else {
int temp0, temp1, temp2, temp3, alpha;
__asm__ volatile (
"srl %[alpha], %[argb], 24 \n\t"
"replv.qb %[temp0], %[alpha] \n\t"
"and %[temp0], %[temp0], %[c_00ffffff] \n\t"
"beqz %[inverse], 0f \n\t"
"divu $zero, %[c_ff000000], %[alpha] \n\t"
"mflo %[temp0] \n\t"
"0: \n\t"
"andi %[temp1], %[argb], 0xff \n\t"
"ext %[temp2], %[argb], 8, 8 \n\t"
"ext %[temp3], %[argb], 16, 8 \n\t"
"mul %[temp1], %[temp1], %[temp0] \n\t"
"mul %[temp2], %[temp2], %[temp0] \n\t"
"mul %[temp3], %[temp3], %[temp0] \n\t"
"precrq.ph.w %[temp1], %[temp2], %[temp1] \n\t"
"addu %[temp3], %[temp3], %[c_8000000] \n\t"
"addu %[temp1], %[temp1], %[c_8000080] \n\t"
"precrq.ph.w %[temp3], %[argb], %[temp3] \n\t"
"precrq.qb.ph %[temp1], %[temp3], %[temp1] \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
[temp3]"=&r"(temp3), [alpha]"=&r"(alpha)
: [inverse]"r"(inverse), [c_00ffffff]"r"(c_00ffffff),
[c_8000000]"r"(c_8000000), [c_8000080]"r"(c_8000080),
[c_ff000000]"r"(c_ff000000), [argb]"r"(argb)
: "memory", "hi", "lo"
);
ptr[x] = temp1;
}
}
}
}
//------------------------------------------------------------------------------
// Entry point
extern void WebPInitAlphaProcessingMIPSdspR2(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingMIPSdspR2(void) {
WebPDispatchAlpha = DispatchAlpha;
WebPMultARGBRow = MultARGBRow;
}
#else // !WEBP_USE_MIPS_DSP_R2
WEBP_DSP_INIT_STUB(WebPInitAlphaProcessingMIPSdspR2)
#endif // WEBP_USE_MIPS_DSP_R2
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