ee3cf211c6
Note that there are two Godot-specific changes made to libwebp for the javascript/HTML5 platform. They are documented in the README.md.
142 lines
5.7 KiB
C
142 lines
5.7 KiB
C
// 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
|