mirror of
https://github.com/webmproject/libwebp.git
synced 2024-12-26 13:48:21 +01:00
067423687d
We saturate the result to [0..255]
It's the easiest and safest, given the wide variety of scaling
range we cover: we're not using floats, so precision is always
an issue at one end or the other of the scaling spectrum.
we also use:
round(a - floor(b))
instead of:
floor(a - round(b))
to handle difficult cases (ratio ~= .99, e.g.)
MIPS code is still disabled (and wrong)
Change-Id: I18d3f5ddc4c524879c257b928329b1c648fa7fb5
(cherry picked from commit ab2dc8939f)
315 lines
16 KiB
C
315 lines
16 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.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// MIPS version of rescaling functions
|
|
//
|
|
// Author(s): Djordje Pesut (djordje.pesut@imgtec.com)
|
|
|
|
#include "src/dsp/dsp.h"
|
|
|
|
#if defined(WEBP_USE_MIPS_DSP_R2) && !defined(WEBP_REDUCE_SIZE)
|
|
|
|
#include <assert.h>
|
|
#include "src/utils/rescaler_utils.h"
|
|
|
|
#define ROUNDER (WEBP_RESCALER_ONE >> 1)
|
|
#define MULT_FIX(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX)
|
|
#define MULT_FIX_FLOOR(x, y) (((uint64_t)(x) * (y)) >> WEBP_RESCALER_RFIX)
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Row export
|
|
|
|
#if 0 // disabled for now. TODO(skal): make match the C-code
|
|
static void ExportRowShrink_MIPSdspR2(WebPRescaler* const wrk) {
|
|
int i;
|
|
const int x_out_max = wrk->dst_width * wrk->num_channels;
|
|
uint8_t* dst = wrk->dst;
|
|
rescaler_t* irow = wrk->irow;
|
|
const rescaler_t* frow = wrk->frow;
|
|
const int yscale = wrk->fy_scale * (-wrk->y_accum);
|
|
int temp0, temp1, temp2, temp3, temp4, temp5, loop_end;
|
|
const int temp7 = (int)wrk->fxy_scale;
|
|
const int temp6 = (x_out_max & ~0x3) << 2;
|
|
assert(!WebPRescalerOutputDone(wrk));
|
|
assert(wrk->y_accum <= 0);
|
|
assert(!wrk->y_expand);
|
|
assert(wrk->fxy_scale != 0);
|
|
if (yscale) {
|
|
if (x_out_max >= 4) {
|
|
int temp8, temp9, temp10, temp11;
|
|
__asm__ volatile (
|
|
"li %[temp3], 0x10000 \n\t"
|
|
"li %[temp4], 0x8000 \n\t"
|
|
"addu %[loop_end], %[frow], %[temp6] \n\t"
|
|
"1: \n\t"
|
|
"lw %[temp0], 0(%[frow]) \n\t"
|
|
"lw %[temp1], 4(%[frow]) \n\t"
|
|
"lw %[temp2], 8(%[frow]) \n\t"
|
|
"lw %[temp5], 12(%[frow]) \n\t"
|
|
"mult $ac0, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac0, %[temp0], %[yscale] \n\t"
|
|
"mult $ac1, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac1, %[temp1], %[yscale] \n\t"
|
|
"mult $ac2, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac2, %[temp2], %[yscale] \n\t"
|
|
"mult $ac3, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac3, %[temp5], %[yscale] \n\t"
|
|
"addiu %[frow], %[frow], 16 \n\t"
|
|
"mfhi %[temp0], $ac0 \n\t"
|
|
"mfhi %[temp1], $ac1 \n\t"
|
|
"mfhi %[temp2], $ac2 \n\t"
|
|
"mfhi %[temp5], $ac3 \n\t"
|
|
"lw %[temp8], 0(%[irow]) \n\t"
|
|
"lw %[temp9], 4(%[irow]) \n\t"
|
|
"lw %[temp10], 8(%[irow]) \n\t"
|
|
"lw %[temp11], 12(%[irow]) \n\t"
|
|
"addiu %[dst], %[dst], 4 \n\t"
|
|
"addiu %[irow], %[irow], 16 \n\t"
|
|
"subu %[temp8], %[temp8], %[temp0] \n\t"
|
|
"subu %[temp9], %[temp9], %[temp1] \n\t"
|
|
"subu %[temp10], %[temp10], %[temp2] \n\t"
|
|
"subu %[temp11], %[temp11], %[temp5] \n\t"
|
|
"mult $ac0, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac0, %[temp8], %[temp7] \n\t"
|
|
"mult $ac1, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac1, %[temp9], %[temp7] \n\t"
|
|
"mult $ac2, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac2, %[temp10], %[temp7] \n\t"
|
|
"mult $ac3, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac3, %[temp11], %[temp7] \n\t"
|
|
"mfhi %[temp8], $ac0 \n\t"
|
|
"mfhi %[temp9], $ac1 \n\t"
|
|
"mfhi %[temp10], $ac2 \n\t"
|
|
"mfhi %[temp11], $ac3 \n\t"
|
|
"sw %[temp0], -16(%[irow]) \n\t"
|
|
"sw %[temp1], -12(%[irow]) \n\t"
|
|
"sw %[temp2], -8(%[irow]) \n\t"
|
|
"sw %[temp5], -4(%[irow]) \n\t"
|
|
"sb %[temp8], -4(%[dst]) \n\t"
|
|
"sb %[temp9], -3(%[dst]) \n\t"
|
|
"sb %[temp10], -2(%[dst]) \n\t"
|
|
"sb %[temp11], -1(%[dst]) \n\t"
|
|
"bne %[frow], %[loop_end], 1b \n\t"
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
|
|
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
|
|
[irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end),
|
|
[temp8]"=&r"(temp8), [temp9]"=&r"(temp9), [temp10]"=&r"(temp10),
|
|
[temp11]"=&r"(temp11), [temp2]"=&r"(temp2)
|
|
: [temp7]"r"(temp7), [yscale]"r"(yscale), [temp6]"r"(temp6)
|
|
: "memory", "hi", "lo", "$ac1hi", "$ac1lo",
|
|
"$ac2hi", "$ac2lo", "$ac3hi", "$ac3lo"
|
|
);
|
|
}
|
|
for (i = 0; i < (x_out_max & 0x3); ++i) {
|
|
const uint32_t frac = (uint32_t)MULT_FIX_FLOOR(*frow++, yscale);
|
|
const int v = (int)MULT_FIX(*irow - frac, wrk->fxy_scale);
|
|
*dst++ = (v > 255) ? 255u : (uint8_t)v;
|
|
*irow++ = frac; // new fractional start
|
|
}
|
|
} else {
|
|
if (x_out_max >= 4) {
|
|
__asm__ volatile (
|
|
"li %[temp3], 0x10000 \n\t"
|
|
"li %[temp4], 0x8000 \n\t"
|
|
"addu %[loop_end], %[irow], %[temp6] \n\t"
|
|
"1: \n\t"
|
|
"lw %[temp0], 0(%[irow]) \n\t"
|
|
"lw %[temp1], 4(%[irow]) \n\t"
|
|
"lw %[temp2], 8(%[irow]) \n\t"
|
|
"lw %[temp5], 12(%[irow]) \n\t"
|
|
"addiu %[dst], %[dst], 4 \n\t"
|
|
"addiu %[irow], %[irow], 16 \n\t"
|
|
"mult $ac0, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac0, %[temp0], %[temp7] \n\t"
|
|
"mult $ac1, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac1, %[temp1], %[temp7] \n\t"
|
|
"mult $ac2, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac2, %[temp2], %[temp7] \n\t"
|
|
"mult $ac3, %[temp3], %[temp4] \n\t"
|
|
"maddu $ac3, %[temp5], %[temp7] \n\t"
|
|
"mfhi %[temp0], $ac0 \n\t"
|
|
"mfhi %[temp1], $ac1 \n\t"
|
|
"mfhi %[temp2], $ac2 \n\t"
|
|
"mfhi %[temp5], $ac3 \n\t"
|
|
"sw $zero, -16(%[irow]) \n\t"
|
|
"sw $zero, -12(%[irow]) \n\t"
|
|
"sw $zero, -8(%[irow]) \n\t"
|
|
"sw $zero, -4(%[irow]) \n\t"
|
|
"sb %[temp0], -4(%[dst]) \n\t"
|
|
"sb %[temp1], -3(%[dst]) \n\t"
|
|
"sb %[temp2], -2(%[dst]) \n\t"
|
|
"sb %[temp5], -1(%[dst]) \n\t"
|
|
"bne %[irow], %[loop_end], 1b \n\t"
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
|
|
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [irow]"+r"(irow),
|
|
[dst]"+r"(dst), [loop_end]"=&r"(loop_end), [temp2]"=&r"(temp2)
|
|
: [temp7]"r"(temp7), [temp6]"r"(temp6)
|
|
: "memory", "hi", "lo", "$ac1hi", "$ac1lo",
|
|
"$ac2hi", "$ac2lo", "$ac3hi", "$ac3lo"
|
|
);
|
|
}
|
|
for (i = 0; i < (x_out_max & 0x3); ++i) {
|
|
const int v = (int)MULT_FIX_FLOOR(*irow, wrk->fxy_scale);
|
|
*dst++ = (v > 255) ? 255u : (uint8_t)v;
|
|
*irow++ = 0;
|
|
}
|
|
}
|
|
}
|
|
#endif // 0
|
|
|
|
static void ExportRowExpand_MIPSdspR2(WebPRescaler* const wrk) {
|
|
int i;
|
|
uint8_t* dst = wrk->dst;
|
|
rescaler_t* irow = wrk->irow;
|
|
const int x_out_max = wrk->dst_width * wrk->num_channels;
|
|
const rescaler_t* frow = wrk->frow;
|
|
int temp0, temp1, temp2, temp3, temp4, temp5, loop_end;
|
|
const int temp6 = (x_out_max & ~0x3) << 2;
|
|
const int temp7 = (int)wrk->fy_scale;
|
|
assert(!WebPRescalerOutputDone(wrk));
|
|
assert(wrk->y_accum <= 0);
|
|
assert(wrk->y_expand);
|
|
assert(wrk->y_sub != 0);
|
|
if (wrk->y_accum == 0) {
|
|
if (x_out_max >= 4) {
|
|
__asm__ volatile (
|
|
"li %[temp4], 0x10000 \n\t"
|
|
"li %[temp5], 0x8000 \n\t"
|
|
"addu %[loop_end], %[frow], %[temp6] \n\t"
|
|
"1: \n\t"
|
|
"lw %[temp0], 0(%[frow]) \n\t"
|
|
"lw %[temp1], 4(%[frow]) \n\t"
|
|
"lw %[temp2], 8(%[frow]) \n\t"
|
|
"lw %[temp3], 12(%[frow]) \n\t"
|
|
"addiu %[dst], %[dst], 4 \n\t"
|
|
"addiu %[frow], %[frow], 16 \n\t"
|
|
"mult $ac0, %[temp4], %[temp5] \n\t"
|
|
"maddu $ac0, %[temp0], %[temp7] \n\t"
|
|
"mult $ac1, %[temp4], %[temp5] \n\t"
|
|
"maddu $ac1, %[temp1], %[temp7] \n\t"
|
|
"mult $ac2, %[temp4], %[temp5] \n\t"
|
|
"maddu $ac2, %[temp2], %[temp7] \n\t"
|
|
"mult $ac3, %[temp4], %[temp5] \n\t"
|
|
"maddu $ac3, %[temp3], %[temp7] \n\t"
|
|
"mfhi %[temp0], $ac0 \n\t"
|
|
"mfhi %[temp1], $ac1 \n\t"
|
|
"mfhi %[temp2], $ac2 \n\t"
|
|
"mfhi %[temp3], $ac3 \n\t"
|
|
"sb %[temp0], -4(%[dst]) \n\t"
|
|
"sb %[temp1], -3(%[dst]) \n\t"
|
|
"sb %[temp2], -2(%[dst]) \n\t"
|
|
"sb %[temp3], -1(%[dst]) \n\t"
|
|
"bne %[frow], %[loop_end], 1b \n\t"
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
|
|
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
|
|
[dst]"+r"(dst), [loop_end]"=&r"(loop_end), [temp2]"=&r"(temp2)
|
|
: [temp7]"r"(temp7), [temp6]"r"(temp6)
|
|
: "memory", "hi", "lo", "$ac1hi", "$ac1lo",
|
|
"$ac2hi", "$ac2lo", "$ac3hi", "$ac3lo"
|
|
);
|
|
}
|
|
for (i = 0; i < (x_out_max & 0x3); ++i) {
|
|
const uint32_t J = *frow++;
|
|
const int v = (int)MULT_FIX(J, wrk->fy_scale);
|
|
*dst++ = (v > 255) ? 255u : (uint8_t)v;
|
|
}
|
|
} else {
|
|
const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
|
|
const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
|
|
if (x_out_max >= 4) {
|
|
int temp8, temp9, temp10, temp11;
|
|
__asm__ volatile (
|
|
"li %[temp8], 0x10000 \n\t"
|
|
"li %[temp9], 0x8000 \n\t"
|
|
"addu %[loop_end], %[frow], %[temp6] \n\t"
|
|
"1: \n\t"
|
|
"lw %[temp0], 0(%[frow]) \n\t"
|
|
"lw %[temp1], 4(%[frow]) \n\t"
|
|
"lw %[temp2], 8(%[frow]) \n\t"
|
|
"lw %[temp3], 12(%[frow]) \n\t"
|
|
"lw %[temp4], 0(%[irow]) \n\t"
|
|
"lw %[temp5], 4(%[irow]) \n\t"
|
|
"lw %[temp10], 8(%[irow]) \n\t"
|
|
"lw %[temp11], 12(%[irow]) \n\t"
|
|
"addiu %[dst], %[dst], 4 \n\t"
|
|
"mult $ac0, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac0, %[A], %[temp0] \n\t"
|
|
"maddu $ac0, %[B], %[temp4] \n\t"
|
|
"mult $ac1, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac1, %[A], %[temp1] \n\t"
|
|
"maddu $ac1, %[B], %[temp5] \n\t"
|
|
"mult $ac2, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac2, %[A], %[temp2] \n\t"
|
|
"maddu $ac2, %[B], %[temp10] \n\t"
|
|
"mult $ac3, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac3, %[A], %[temp3] \n\t"
|
|
"maddu $ac3, %[B], %[temp11] \n\t"
|
|
"addiu %[frow], %[frow], 16 \n\t"
|
|
"addiu %[irow], %[irow], 16 \n\t"
|
|
"mfhi %[temp0], $ac0 \n\t"
|
|
"mfhi %[temp1], $ac1 \n\t"
|
|
"mfhi %[temp2], $ac2 \n\t"
|
|
"mfhi %[temp3], $ac3 \n\t"
|
|
"mult $ac0, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac0, %[temp0], %[temp7] \n\t"
|
|
"mult $ac1, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac1, %[temp1], %[temp7] \n\t"
|
|
"mult $ac2, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac2, %[temp2], %[temp7] \n\t"
|
|
"mult $ac3, %[temp8], %[temp9] \n\t"
|
|
"maddu $ac3, %[temp3], %[temp7] \n\t"
|
|
"mfhi %[temp0], $ac0 \n\t"
|
|
"mfhi %[temp1], $ac1 \n\t"
|
|
"mfhi %[temp2], $ac2 \n\t"
|
|
"mfhi %[temp3], $ac3 \n\t"
|
|
"sb %[temp0], -4(%[dst]) \n\t"
|
|
"sb %[temp1], -3(%[dst]) \n\t"
|
|
"sb %[temp2], -2(%[dst]) \n\t"
|
|
"sb %[temp3], -1(%[dst]) \n\t"
|
|
"bne %[frow], %[loop_end], 1b \n\t"
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
|
|
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
|
|
[irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end),
|
|
[temp8]"=&r"(temp8), [temp9]"=&r"(temp9), [temp10]"=&r"(temp10),
|
|
[temp11]"=&r"(temp11), [temp2]"=&r"(temp2)
|
|
: [temp7]"r"(temp7), [temp6]"r"(temp6), [A]"r"(A), [B]"r"(B)
|
|
: "memory", "hi", "lo", "$ac1hi", "$ac1lo",
|
|
"$ac2hi", "$ac2lo", "$ac3hi", "$ac3lo"
|
|
);
|
|
}
|
|
for (i = 0; i < (x_out_max & 0x3); ++i) {
|
|
const uint64_t I = (uint64_t)A * *frow++
|
|
+ (uint64_t)B * *irow++;
|
|
const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX);
|
|
const int v = (int)MULT_FIX(J, wrk->fy_scale);
|
|
*dst++ = (v > 255) ? 255u : (uint8_t)v;
|
|
}
|
|
}
|
|
}
|
|
|
|
#undef MULT_FIX_FLOOR
|
|
#undef MULT_FIX
|
|
#undef ROUNDER
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Entry point
|
|
|
|
extern void WebPRescalerDspInitMIPSdspR2(void);
|
|
|
|
WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPSdspR2(void) {
|
|
WebPRescalerExportRowExpand = ExportRowExpand_MIPSdspR2;
|
|
// WebPRescalerExportRowShrink = ExportRowShrink_MIPSdspR2;
|
|
}
|
|
|
|
#else // !WEBP_USE_MIPS_DSP_R2
|
|
|
|
WEBP_DSP_INIT_STUB(WebPRescalerDspInitMIPSdspR2)
|
|
|
|
#endif // WEBP_USE_MIPS_DSP_R2
|