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virtualx-engine/thirdparty/libwebp/dsp/rescaler_sse2.c
Rémi Verschelde ee3cf211c6 webp: Make it a module and unbundle libwebp thirdparty files 
Note that there are two Godot-specific changes made to libwebp
for the javascript/HTML5 platform. They are documented in the
README.md.
2016-10-15 11:50:39 +02:00

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// Copyright 2015 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.
// -----------------------------------------------------------------------------
//
// SSE2 Rescaling functions
//
// Author: Skal (pascal.massimino@gmail.com)
#include "./dsp.h"
#if defined(WEBP_USE_SSE2)
#include <emmintrin.h>
#include <assert.h>
#include "../utils/rescaler.h"
#include "../utils/utils.h"
//------------------------------------------------------------------------------
// Implementations of critical functions ImportRow / ExportRow
#define ROUNDER (WEBP_RESCALER_ONE >> 1)
#define MULT_FIX(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX)
// input: 8 bytes ABCDEFGH -> output: A0E0B0F0C0G0D0H0
static void LoadTwoPixels(const uint8_t* const src, __m128i* out) {
const __m128i zero = _mm_setzero_si128();
const __m128i A = _mm_loadl_epi64((const __m128i*)(src)); // ABCDEFGH
const __m128i B = _mm_unpacklo_epi8(A, zero); // A0B0C0D0E0F0G0H0
const __m128i C = _mm_srli_si128(B, 8); // E0F0G0H0
*out = _mm_unpacklo_epi16(B, C);
}
// input: 8 bytes ABCDEFGH -> output: A0B0C0D0E0F0G0H0
static void LoadHeightPixels(const uint8_t* const src, __m128i* out) {
const __m128i zero = _mm_setzero_si128();
const __m128i A = _mm_loadl_epi64((const __m128i*)(src)); // ABCDEFGH
*out = _mm_unpacklo_epi8(A, zero);
}
static void RescalerImportRowExpandSSE2(WebPRescaler* const wrk,
const uint8_t* src) {
rescaler_t* frow = wrk->frow;
const rescaler_t* const frow_end = frow + wrk->dst_width * wrk->num_channels;
const int x_add = wrk->x_add;
int accum = x_add;
__m128i cur_pixels;
assert(!WebPRescalerInputDone(wrk));
assert(wrk->x_expand);
if (wrk->num_channels == 4) {
if (wrk->src_width < 2) {
WebPRescalerImportRowExpandC(wrk, src);
return;
}
LoadTwoPixels(src, &cur_pixels);
src += 4;
while (1) {
const __m128i mult = _mm_set1_epi32(((x_add - accum) << 16) | accum);
const __m128i out = _mm_madd_epi16(cur_pixels, mult);
_mm_storeu_si128((__m128i*)frow, out);
frow += 4;
if (frow >= frow_end) break;
accum -= wrk->x_sub;
if (accum < 0) {
LoadTwoPixels(src, &cur_pixels);
src += 4;
accum += x_add;
}
}
} else {
int left;
const uint8_t* const src_limit = src + wrk->src_width - 8;
if (wrk->src_width < 8) {
WebPRescalerImportRowExpandC(wrk, src);
return;
}
LoadHeightPixels(src, &cur_pixels);
src += 7;
left = 7;
while (1) {
const __m128i mult = _mm_cvtsi32_si128(((x_add - accum) << 16) | accum);
const __m128i out = _mm_madd_epi16(cur_pixels, mult);
assert(sizeof(*frow) == sizeof(uint32_t));
WebPUint32ToMem((uint8_t*)frow, _mm_cvtsi128_si32(out));
frow += 1;
if (frow >= frow_end) break;
accum -= wrk->x_sub;
if (accum < 0) {
if (--left) {
cur_pixels = _mm_srli_si128(cur_pixels, 2);
} else if (src <= src_limit) {
LoadHeightPixels(src, &cur_pixels);
src += 7;
left = 7;
} else { // tail
cur_pixels = _mm_srli_si128(cur_pixels, 2);
cur_pixels = _mm_insert_epi16(cur_pixels, src[1], 1);
src += 1;
left = 1;
}
accum += x_add;
}
}
}
assert(accum == 0);
}
static void RescalerImportRowShrinkSSE2(WebPRescaler* const wrk,
const uint8_t* src) {
const int x_sub = wrk->x_sub;
int accum = 0;
const __m128i zero = _mm_setzero_si128();
const __m128i mult0 = _mm_set1_epi16(x_sub);
const __m128i mult1 = _mm_set1_epi32(wrk->fx_scale);
const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
__m128i sum = zero;
rescaler_t* frow = wrk->frow;
const rescaler_t* const frow_end = wrk->frow + 4 * wrk->dst_width;
if (wrk->num_channels != 4 || wrk->x_add > (x_sub << 7)) {
WebPRescalerImportRowShrinkC(wrk, src);
return;
}
assert(!WebPRescalerInputDone(wrk));
assert(!wrk->x_expand);
for (; frow < frow_end; frow += 4) {
__m128i base = zero;
accum += wrk->x_add;
while (accum > 0) {
const __m128i A = _mm_cvtsi32_si128(WebPMemToUint32(src));
src += 4;
base = _mm_unpacklo_epi8(A, zero);
// To avoid overflow, we need: base * x_add / x_sub < 32768
// => x_add < x_sub << 7. That's a 1/128 reduction ratio limit.
sum = _mm_add_epi16(sum, base);
accum -= x_sub;
}
{ // Emit next horizontal pixel.
const __m128i mult = _mm_set1_epi16(-accum);
const __m128i frac0 = _mm_mullo_epi16(base, mult); // 16b x 16b -> 32b
const __m128i frac1 = _mm_mulhi_epu16(base, mult);
const __m128i frac = _mm_unpacklo_epi16(frac0, frac1); // frac is 32b
const __m128i A0 = _mm_mullo_epi16(sum, mult0);
const __m128i A1 = _mm_mulhi_epu16(sum, mult0);
const __m128i B0 = _mm_unpacklo_epi16(A0, A1); // sum * x_sub
const __m128i frow_out = _mm_sub_epi32(B0, frac); // sum * x_sub - frac
const __m128i D0 = _mm_srli_epi64(frac, 32);
const __m128i D1 = _mm_mul_epu32(frac, mult1); // 32b x 16b -> 64b
const __m128i D2 = _mm_mul_epu32(D0, mult1);
const __m128i E1 = _mm_add_epi64(D1, rounder);
const __m128i E2 = _mm_add_epi64(D2, rounder);
const __m128i F1 = _mm_shuffle_epi32(E1, 1 | (3 << 2));
const __m128i F2 = _mm_shuffle_epi32(E2, 1 | (3 << 2));
const __m128i G = _mm_unpacklo_epi32(F1, F2);
sum = _mm_packs_epi32(G, zero);
_mm_storeu_si128((__m128i*)frow, frow_out);
}
}
assert(accum == 0);
}
//------------------------------------------------------------------------------
// Row export
// load *src as epi64, multiply by mult and store result in [out0 ... out3]
static WEBP_INLINE void LoadDispatchAndMult(const rescaler_t* const src,
const __m128i* const mult,
__m128i* const out0,
__m128i* const out1,
__m128i* const out2,
__m128i* const out3) {
const __m128i A0 = _mm_loadu_si128((const __m128i*)(src + 0));
const __m128i A1 = _mm_loadu_si128((const __m128i*)(src + 4));
const __m128i A2 = _mm_srli_epi64(A0, 32);
const __m128i A3 = _mm_srli_epi64(A1, 32);
if (mult != NULL) {
*out0 = _mm_mul_epu32(A0, *mult);
*out1 = _mm_mul_epu32(A1, *mult);
*out2 = _mm_mul_epu32(A2, *mult);
*out3 = _mm_mul_epu32(A3, *mult);
} else {
*out0 = A0;
*out1 = A1;
*out2 = A2;
*out3 = A3;
}
}
static WEBP_INLINE void ProcessRow(const __m128i* const A0,
const __m128i* const A1,
const __m128i* const A2,
const __m128i* const A3,
const __m128i* const mult,
uint8_t* const dst) {
const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
const __m128i mask = _mm_set_epi32(0xffffffffu, 0, 0xffffffffu, 0);
const __m128i B0 = _mm_mul_epu32(*A0, *mult);
const __m128i B1 = _mm_mul_epu32(*A1, *mult);
const __m128i B2 = _mm_mul_epu32(*A2, *mult);
const __m128i B3 = _mm_mul_epu32(*A3, *mult);
const __m128i C0 = _mm_add_epi64(B0, rounder);
const __m128i C1 = _mm_add_epi64(B1, rounder);
const __m128i C2 = _mm_add_epi64(B2, rounder);
const __m128i C3 = _mm_add_epi64(B3, rounder);
const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX);
const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX);
#if (WEBP_RESCALER_FIX < 32)
const __m128i D2 =
_mm_and_si128(_mm_slli_epi64(C2, 32 - WEBP_RESCALER_RFIX), mask);
const __m128i D3 =
_mm_and_si128(_mm_slli_epi64(C3, 32 - WEBP_RESCALER_RFIX), mask);
#else
const __m128i D2 = _mm_and_si128(C2, mask);
const __m128i D3 = _mm_and_si128(C3, mask);
#endif
const __m128i E0 = _mm_or_si128(D0, D2);
const __m128i E1 = _mm_or_si128(D1, D3);
const __m128i F = _mm_packs_epi32(E0, E1);
const __m128i G = _mm_packus_epi16(F, F);
_mm_storel_epi64((__m128i*)dst, G);
}
static void RescalerExportRowExpandSSE2(WebPRescaler* const wrk) {
int x_out;
uint8_t* const dst = wrk->dst;
rescaler_t* const irow = wrk->irow;
const int x_out_max = wrk->dst_width * wrk->num_channels;
const rescaler_t* const frow = wrk->frow;
const __m128i mult = _mm_set_epi32(0, wrk->fy_scale, 0, wrk->fy_scale);
assert(!WebPRescalerOutputDone(wrk));
assert(wrk->y_accum <= 0 && wrk->y_sub + wrk->y_accum >= 0);
assert(wrk->y_expand);
if (wrk->y_accum == 0) {
for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
__m128i A0, A1, A2, A3;
LoadDispatchAndMult(frow + x_out, NULL, &A0, &A1, &A2, &A3);
ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out);
}
for (; x_out < x_out_max; ++x_out) {
const uint32_t J = frow[x_out];
const int v = (int)MULT_FIX(J, wrk->fy_scale);
assert(v >= 0 && v <= 255);
dst[x_out] = 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);
const __m128i mA = _mm_set_epi32(0, A, 0, A);
const __m128i mB = _mm_set_epi32(0, B, 0, B);
const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
__m128i A0, A1, A2, A3, B0, B1, B2, B3;
LoadDispatchAndMult(frow + x_out, &mA, &A0, &A1, &A2, &A3);
LoadDispatchAndMult(irow + x_out, &mB, &B0, &B1, &B2, &B3);
{
const __m128i C0 = _mm_add_epi64(A0, B0);
const __m128i C1 = _mm_add_epi64(A1, B1);
const __m128i C2 = _mm_add_epi64(A2, B2);
const __m128i C3 = _mm_add_epi64(A3, B3);
const __m128i D0 = _mm_add_epi64(C0, rounder);
const __m128i D1 = _mm_add_epi64(C1, rounder);
const __m128i D2 = _mm_add_epi64(C2, rounder);
const __m128i D3 = _mm_add_epi64(C3, rounder);
const __m128i E0 = _mm_srli_epi64(D0, WEBP_RESCALER_RFIX);
const __m128i E1 = _mm_srli_epi64(D1, WEBP_RESCALER_RFIX);
const __m128i E2 = _mm_srli_epi64(D2, WEBP_RESCALER_RFIX);
const __m128i E3 = _mm_srli_epi64(D3, WEBP_RESCALER_RFIX);
ProcessRow(&E0, &E1, &E2, &E3, &mult, dst + x_out);
}
}
for (; x_out < x_out_max; ++x_out) {
const uint64_t I = (uint64_t)A * frow[x_out]
+ (uint64_t)B * irow[x_out];
const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX);
const int v = (int)MULT_FIX(J, wrk->fy_scale);
assert(v >= 0 && v <= 255);
dst[x_out] = v;
}
}
}
static void RescalerExportRowShrinkSSE2(WebPRescaler* const wrk) {
int x_out;
uint8_t* const dst = wrk->dst;
rescaler_t* const irow = wrk->irow;
const int x_out_max = wrk->dst_width * wrk->num_channels;
const rescaler_t* const frow = wrk->frow;
const uint32_t yscale = wrk->fy_scale * (-wrk->y_accum);
assert(!WebPRescalerOutputDone(wrk));
assert(wrk->y_accum <= 0);
assert(!wrk->y_expand);
if (yscale) {
const int scale_xy = wrk->fxy_scale;
const __m128i mult_xy = _mm_set_epi32(0, scale_xy, 0, scale_xy);
const __m128i mult_y = _mm_set_epi32(0, yscale, 0, yscale);
const __m128i rounder = _mm_set_epi32(0, ROUNDER, 0, ROUNDER);
for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
__m128i A0, A1, A2, A3, B0, B1, B2, B3;
LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3);
LoadDispatchAndMult(frow + x_out, &mult_y, &B0, &B1, &B2, &B3);
{
const __m128i C0 = _mm_add_epi64(B0, rounder);
const __m128i C1 = _mm_add_epi64(B1, rounder);
const __m128i C2 = _mm_add_epi64(B2, rounder);
const __m128i C3 = _mm_add_epi64(B3, rounder);
const __m128i D0 = _mm_srli_epi64(C0, WEBP_RESCALER_RFIX); // = frac
const __m128i D1 = _mm_srli_epi64(C1, WEBP_RESCALER_RFIX);
const __m128i D2 = _mm_srli_epi64(C2, WEBP_RESCALER_RFIX);
const __m128i D3 = _mm_srli_epi64(C3, WEBP_RESCALER_RFIX);
const __m128i E0 = _mm_sub_epi64(A0, D0); // irow[x] - frac
const __m128i E1 = _mm_sub_epi64(A1, D1);
const __m128i E2 = _mm_sub_epi64(A2, D2);
const __m128i E3 = _mm_sub_epi64(A3, D3);
const __m128i F2 = _mm_slli_epi64(D2, 32);
const __m128i F3 = _mm_slli_epi64(D3, 32);
const __m128i G0 = _mm_or_si128(D0, F2);
const __m128i G1 = _mm_or_si128(D1, F3);
_mm_storeu_si128((__m128i*)(irow + x_out + 0), G0);
_mm_storeu_si128((__m128i*)(irow + x_out + 4), G1);
ProcessRow(&E0, &E1, &E2, &E3, &mult_xy, dst + x_out);
}
}
for (; x_out < x_out_max; ++x_out) {
const uint32_t frac = (int)MULT_FIX(frow[x_out], yscale);
const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale);
assert(v >= 0 && v <= 255);
dst[x_out] = v;
irow[x_out] = frac; // new fractional start
}
} else {
const uint32_t scale = wrk->fxy_scale;
const __m128i mult = _mm_set_epi32(0, scale, 0, scale);
const __m128i zero = _mm_setzero_si128();
for (x_out = 0; x_out + 8 <= x_out_max; x_out += 8) {
__m128i A0, A1, A2, A3;
LoadDispatchAndMult(irow + x_out, NULL, &A0, &A1, &A2, &A3);
_mm_storeu_si128((__m128i*)(irow + x_out + 0), zero);
_mm_storeu_si128((__m128i*)(irow + x_out + 4), zero);
ProcessRow(&A0, &A1, &A2, &A3, &mult, dst + x_out);
}
for (; x_out < x_out_max; ++x_out) {
const int v = (int)MULT_FIX(irow[x_out], scale);
assert(v >= 0 && v <= 255);
dst[x_out] = v;
irow[x_out] = 0;
}
}
}
#undef MULT_FIX
#undef ROUNDER
//------------------------------------------------------------------------------
extern void WebPRescalerDspInitSSE2(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitSSE2(void) {
WebPRescalerImportRowExpand = RescalerImportRowExpandSSE2;
WebPRescalerImportRowShrink = RescalerImportRowShrinkSSE2;
WebPRescalerExportRowExpand = RescalerExportRowExpandSSE2;
WebPRescalerExportRowShrink = RescalerExportRowShrinkSSE2;
}
#else // !WEBP_USE_SSE2
WEBP_DSP_INIT_STUB(WebPRescalerDspInitSSE2)
#endif // WEBP_USE_SSE2
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