mirror of
https://github.com/webmproject/libwebp.git
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286 lines
11 KiB
C
286 lines
11 KiB
C
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Utilities for processing transparent channel.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_SSE2)
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#include <emmintrin.h>
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//------------------------------------------------------------------------------
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static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
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int width, int height,
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uint8_t* dst, int dst_stride) {
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// alpha_and stores an 'and' operation of all the alpha[] values. The final
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// value is not 0xff if any of the alpha[] is not equal to 0xff.
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uint32_t alpha_and = 0xff;
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int i, j;
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const __m128i zero = _mm_setzero_si128();
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const __m128i rgb_mask = _mm_set1_epi32(0xffffff00u); // to preserve RGB
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const __m128i all_0xff = _mm_set_epi32(0, 0, ~0u, ~0u);
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__m128i all_alphas = all_0xff;
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// We must be able to access 3 extra bytes after the last written byte
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// 'dst[4 * width - 4]', because we don't know if alpha is the first or the
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// last byte of the quadruplet.
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const int limit = (width - 1) & ~7;
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for (j = 0; j < height; ++j) {
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__m128i* out = (__m128i*)dst;
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for (i = 0; i < limit; i += 8) {
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// load 8 alpha bytes
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const __m128i a0 = _mm_loadl_epi64((const __m128i*)&alpha[i]);
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const __m128i a1 = _mm_unpacklo_epi8(a0, zero);
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const __m128i a2_lo = _mm_unpacklo_epi16(a1, zero);
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const __m128i a2_hi = _mm_unpackhi_epi16(a1, zero);
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// load 8 dst pixels (32 bytes)
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const __m128i b0_lo = _mm_loadu_si128(out + 0);
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const __m128i b0_hi = _mm_loadu_si128(out + 1);
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// mask dst alpha values
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const __m128i b1_lo = _mm_and_si128(b0_lo, rgb_mask);
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const __m128i b1_hi = _mm_and_si128(b0_hi, rgb_mask);
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// combine
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const __m128i b2_lo = _mm_or_si128(b1_lo, a2_lo);
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const __m128i b2_hi = _mm_or_si128(b1_hi, a2_hi);
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// store
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_mm_storeu_si128(out + 0, b2_lo);
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_mm_storeu_si128(out + 1, b2_hi);
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// accumulate eight alpha 'and' in parallel
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all_alphas = _mm_and_si128(all_alphas, a0);
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out += 2;
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}
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for (; i < width; ++i) {
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const uint32_t alpha_value = alpha[i];
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dst[4 * i] = alpha_value;
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alpha_and &= alpha_value;
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}
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alpha += alpha_stride;
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dst += dst_stride;
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}
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// Combine the eight alpha 'and' into a 8-bit mask.
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alpha_and &= _mm_movemask_epi8(_mm_cmpeq_epi8(all_alphas, all_0xff));
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return (alpha_and != 0xff);
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}
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static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride,
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int width, int height,
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uint32_t* dst, int dst_stride) {
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int i, j;
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const __m128i zero = _mm_setzero_si128();
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const int limit = width & ~15;
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for (j = 0; j < height; ++j) {
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for (i = 0; i < limit; i += 16) { // process 16 alpha bytes
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const __m128i a0 = _mm_loadu_si128((const __m128i*)&alpha[i]);
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const __m128i a1 = _mm_unpacklo_epi8(zero, a0); // note the 'zero' first!
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const __m128i b1 = _mm_unpackhi_epi8(zero, a0);
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const __m128i a2_lo = _mm_unpacklo_epi16(a1, zero);
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const __m128i b2_lo = _mm_unpacklo_epi16(b1, zero);
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const __m128i a2_hi = _mm_unpackhi_epi16(a1, zero);
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const __m128i b2_hi = _mm_unpackhi_epi16(b1, zero);
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_mm_storeu_si128((__m128i*)&dst[i + 0], a2_lo);
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_mm_storeu_si128((__m128i*)&dst[i + 4], a2_hi);
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_mm_storeu_si128((__m128i*)&dst[i + 8], b2_lo);
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_mm_storeu_si128((__m128i*)&dst[i + 12], b2_hi);
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}
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for (; i < width; ++i) dst[i] = alpha[i] << 8;
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alpha += alpha_stride;
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dst += dst_stride;
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}
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}
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static int ExtractAlpha(const uint8_t* argb, int argb_stride,
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int width, int height,
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uint8_t* alpha, int alpha_stride) {
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// alpha_and stores an 'and' operation of all the alpha[] values. The final
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// value is not 0xff if any of the alpha[] is not equal to 0xff.
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uint32_t alpha_and = 0xff;
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int i, j;
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const __m128i a_mask = _mm_set1_epi32(0xffu); // to preserve alpha
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const __m128i all_0xff = _mm_set_epi32(0, 0, ~0u, ~0u);
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__m128i all_alphas = all_0xff;
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// We must be able to access 3 extra bytes after the last written byte
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// 'src[4 * width - 4]', because we don't know if alpha is the first or the
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// last byte of the quadruplet.
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const int limit = (width - 1) & ~7;
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for (j = 0; j < height; ++j) {
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const __m128i* src = (const __m128i*)argb;
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for (i = 0; i < limit; i += 8) {
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// load 32 argb bytes
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const __m128i a0 = _mm_loadu_si128(src + 0);
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const __m128i a1 = _mm_loadu_si128(src + 1);
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const __m128i b0 = _mm_and_si128(a0, a_mask);
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const __m128i b1 = _mm_and_si128(a1, a_mask);
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const __m128i c0 = _mm_packs_epi32(b0, b1);
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const __m128i d0 = _mm_packus_epi16(c0, c0);
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// store
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_mm_storel_epi64((__m128i*)&alpha[i], d0);
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// accumulate eight alpha 'and' in parallel
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all_alphas = _mm_and_si128(all_alphas, d0);
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src += 2;
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}
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for (; i < width; ++i) {
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const uint32_t alpha_value = argb[4 * i];
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alpha[i] = alpha_value;
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alpha_and &= alpha_value;
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}
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argb += argb_stride;
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alpha += alpha_stride;
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}
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// Combine the eight alpha 'and' into a 8-bit mask.
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alpha_and &= _mm_movemask_epi8(_mm_cmpeq_epi8(all_alphas, all_0xff));
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return (alpha_and == 0xff);
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}
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//------------------------------------------------------------------------------
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// Non-dither premultiplied modes
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#define MULTIPLIER(a) ((a) * 0x8081)
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#define PREMULTIPLY(x, m) (((x) * (m)) >> 23)
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// We can't use a 'const int' for the SHUFFLE value, because it has to be an
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// immediate in the _mm_shufflexx_epi16() instruction. We really need a macro.
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// We use: v / 255 = (v * 0x8081) >> 23, where v = alpha * {r,g,b} is a 16bit
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// value.
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#define APPLY_ALPHA(RGBX, SHUFFLE) do { \
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const __m128i argb0 = _mm_loadu_si128((const __m128i*)&(RGBX)); \
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const __m128i argb1_lo = _mm_unpacklo_epi8(argb0, zero); \
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const __m128i argb1_hi = _mm_unpackhi_epi8(argb0, zero); \
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const __m128i alpha0_lo = _mm_or_si128(argb1_lo, kMask); \
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const __m128i alpha0_hi = _mm_or_si128(argb1_hi, kMask); \
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const __m128i alpha1_lo = _mm_shufflelo_epi16(alpha0_lo, SHUFFLE); \
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const __m128i alpha1_hi = _mm_shufflelo_epi16(alpha0_hi, SHUFFLE); \
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const __m128i alpha2_lo = _mm_shufflehi_epi16(alpha1_lo, SHUFFLE); \
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const __m128i alpha2_hi = _mm_shufflehi_epi16(alpha1_hi, SHUFFLE); \
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/* alpha2 = [ff a0 a0 a0][ff a1 a1 a1] */ \
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const __m128i A0_lo = _mm_mullo_epi16(alpha2_lo, argb1_lo); \
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const __m128i A0_hi = _mm_mullo_epi16(alpha2_hi, argb1_hi); \
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const __m128i A1_lo = _mm_mulhi_epu16(A0_lo, kMult); \
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const __m128i A1_hi = _mm_mulhi_epu16(A0_hi, kMult); \
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const __m128i A2_lo = _mm_srli_epi16(A1_lo, 7); \
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const __m128i A2_hi = _mm_srli_epi16(A1_hi, 7); \
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const __m128i A3 = _mm_packus_epi16(A2_lo, A2_hi); \
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_mm_storeu_si128((__m128i*)&(RGBX), A3); \
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} while (0)
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static void ApplyAlphaMultiply_SSE2(uint8_t* rgba, int alpha_first,
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int w, int h, int stride) {
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const __m128i zero = _mm_setzero_si128();
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const __m128i kMult = _mm_set1_epi16(0x8081u);
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const __m128i kMask = _mm_set_epi16(0, 0xff, 0xff, 0, 0, 0xff, 0xff, 0);
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const int kSpan = 4;
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while (h-- > 0) {
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uint32_t* const rgbx = (uint32_t*)rgba;
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int i;
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if (!alpha_first) {
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for (i = 0; i + kSpan <= w; i += kSpan) {
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APPLY_ALPHA(rgbx[i], _MM_SHUFFLE(2, 3, 3, 3));
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}
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} else {
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for (i = 0; i + kSpan <= w; i += kSpan) {
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APPLY_ALPHA(rgbx[i], _MM_SHUFFLE(0, 0, 0, 1));
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}
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}
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// Finish with left-overs.
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for (; i < w; ++i) {
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uint8_t* const rgb = rgba + (alpha_first ? 1 : 0);
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const uint8_t* const alpha = rgba + (alpha_first ? 0 : 3);
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const uint32_t a = alpha[4 * i];
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if (a != 0xff) {
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const uint32_t mult = MULTIPLIER(a);
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rgb[4 * i + 0] = PREMULTIPLY(rgb[4 * i + 0], mult);
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rgb[4 * i + 1] = PREMULTIPLY(rgb[4 * i + 1], mult);
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rgb[4 * i + 2] = PREMULTIPLY(rgb[4 * i + 2], mult);
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}
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}
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rgba += stride;
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}
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}
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#undef MULTIPLIER
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#undef PREMULTIPLY
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// -----------------------------------------------------------------------------
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// Apply alpha value to rows
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static void MultARGBRow_SSE2(uint32_t* const ptr, int width, int inverse) {
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int x = 0;
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if (!inverse) {
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const int kSpan = 2;
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const __m128i zero = _mm_setzero_si128();
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const __m128i k128 = _mm_set1_epi16(128);
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const __m128i kMult = _mm_set1_epi16(0x0101);
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const __m128i kMask = _mm_set_epi16(0, 0xff, 0, 0, 0, 0xff, 0, 0);
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for (x = 0; x + kSpan <= width; x += kSpan) {
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// To compute 'result = (int)(a * x / 255. + .5)', we use:
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// tmp = a * v + 128, result = (tmp * 0x0101u) >> 16
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const __m128i A0 = _mm_loadl_epi64((const __m128i*)&ptr[x]);
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const __m128i A1 = _mm_unpacklo_epi8(A0, zero);
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const __m128i A2 = _mm_or_si128(A1, kMask);
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const __m128i A3 = _mm_shufflelo_epi16(A2, _MM_SHUFFLE(2, 3, 3, 3));
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const __m128i A4 = _mm_shufflehi_epi16(A3, _MM_SHUFFLE(2, 3, 3, 3));
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// here, A4 = [ff a0 a0 a0][ff a1 a1 a1]
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const __m128i A5 = _mm_mullo_epi16(A4, A1);
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const __m128i A6 = _mm_add_epi16(A5, k128);
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const __m128i A7 = _mm_mulhi_epu16(A6, kMult);
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const __m128i A10 = _mm_packus_epi16(A7, zero);
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_mm_storel_epi64((__m128i*)&ptr[x], A10);
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}
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}
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width -= x;
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if (width > 0) WebPMultARGBRowC(ptr + x, width, inverse);
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}
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static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha,
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int width, int inverse) {
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int x = 0;
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if (!inverse) {
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const __m128i zero = _mm_setzero_si128();
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const __m128i k128 = _mm_set1_epi16(128);
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const __m128i kMult = _mm_set1_epi16(0x0101);
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for (x = 0; x + 8 <= width; x += 8) {
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const __m128i v0 = _mm_loadl_epi64((__m128i*)&ptr[x]);
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const __m128i a0 = _mm_loadl_epi64((const __m128i*)&alpha[x]);
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const __m128i v1 = _mm_unpacklo_epi8(v0, zero);
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const __m128i a1 = _mm_unpacklo_epi8(a0, zero);
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const __m128i v2 = _mm_mullo_epi16(v1, a1);
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const __m128i v3 = _mm_add_epi16(v2, k128);
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const __m128i v4 = _mm_mulhi_epu16(v3, kMult);
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const __m128i v5 = _mm_packus_epi16(v4, zero);
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_mm_storel_epi64((__m128i*)&ptr[x], v5);
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}
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}
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width -= x;
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if (width > 0) WebPMultRowC(ptr + x, alpha + x, width, inverse);
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}
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//------------------------------------------------------------------------------
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// Entry point
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extern void WebPInitAlphaProcessingSSE2(void);
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WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) {
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WebPMultARGBRow = MultARGBRow_SSE2;
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WebPMultRow = MultRow_SSE2;
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WebPApplyAlphaMultiply = ApplyAlphaMultiply_SSE2;
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WebPDispatchAlpha = DispatchAlpha;
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WebPDispatchAlphaToGreen = DispatchAlphaToGreen;
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WebPExtractAlpha = ExtractAlpha;
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}
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#else // !WEBP_USE_SSE2
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WEBP_DSP_INIT_STUB(WebPInitAlphaProcessingSSE2)
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#endif // WEBP_USE_SSE2
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