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https://github.com/webmproject/libwebp.git
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b44eda3f60
generates a stub function when the specific architecture is not enabled, exposing a symbol in the module, avoiding a compiler warning Change-Id: Ia9336e57466a9b5241b85c1c95838e91c9283147
68 lines
2.2 KiB
C
68 lines
2.2 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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// ARGB making functions (SSE2 version).
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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 <assert.h>
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#include <emmintrin.h>
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#include <string.h>
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static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) {
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return (((uint32_t)a << 24) | (r << 16) | (g << 8) | b);
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}
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static void PackARGB(const uint8_t* a, const uint8_t* r, const uint8_t* g,
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const uint8_t* b, int len, uint32_t* out) {
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if (g == r + 1) { // RGBA input order. Need to swap R and B.
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int i = 0;
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const int len_max = len & ~3; // max length processed in main loop
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const __m128i red_blue_mask = _mm_set1_epi32(0x00ff00ffu);
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assert(b == r + 2);
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assert(a == r + 3);
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for (; i < len_max; i += 4) {
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const __m128i A = _mm_loadu_si128((const __m128i*)(r + 4 * i));
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const __m128i B = _mm_and_si128(A, red_blue_mask); // R 0 B 0
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const __m128i C = _mm_andnot_si128(red_blue_mask, A); // 0 G 0 A
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const __m128i D = _mm_shufflelo_epi16(B, _MM_SHUFFLE(2, 3, 0, 1));
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const __m128i E = _mm_shufflehi_epi16(D, _MM_SHUFFLE(2, 3, 0, 1));
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const __m128i F = _mm_or_si128(E, C);
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_mm_storeu_si128((__m128i*)(out + i), F);
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}
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for (; i < len; ++i) {
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out[i] = MakeARGB32(a[4 * i], r[4 * i], g[4 * i], b[4 * i]);
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}
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} else {
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assert(g == b + 1);
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assert(r == b + 2);
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assert(a == b + 3);
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memcpy(out, b, len * 4);
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}
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}
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//------------------------------------------------------------------------------
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// Entry point
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extern void VP8EncDspARGBInitSSE2(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInitSSE2(void) {
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VP8PackARGB = PackARGB;
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}
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#else // !WEBP_USE_SSE2
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WEBP_DSP_INIT_STUB(VP8EncDspARGBInitSSE2)
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#endif // WEBP_USE_SSE2
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