yuv_convert_mmx.cpp (1550B)
1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include <mmintrin.h> 6 #include "yuv_row.h" 7 8 namespace mozilla { 9 namespace gfx { 10 11 // FilterRows combines two rows of the image using linear interpolation. 12 // MMX version does 8 pixels at a time. 13 void FilterRows_MMX(uint8_t* ybuf, const uint8_t* y0_ptr, const uint8_t* y1_ptr, 14 int source_width, int source_y_fraction) { 15 __m64 zero = _mm_setzero_si64(); 16 __m64 y1_fraction = _mm_set1_pi16(source_y_fraction); 17 __m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction); 18 19 const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr); 20 const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr); 21 __m64* dest64 = reinterpret_cast<__m64*>(ybuf); 22 __m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width); 23 24 do { 25 __m64 y0 = *y0_ptr64++; 26 __m64 y1 = *y1_ptr64++; 27 __m64 y2 = _mm_unpackhi_pi8(y0, zero); 28 __m64 y3 = _mm_unpackhi_pi8(y1, zero); 29 y0 = _mm_unpacklo_pi8(y0, zero); 30 y1 = _mm_unpacklo_pi8(y1, zero); 31 y0 = _mm_mullo_pi16(y0, y0_fraction); 32 y1 = _mm_mullo_pi16(y1, y1_fraction); 33 y2 = _mm_mullo_pi16(y2, y0_fraction); 34 y3 = _mm_mullo_pi16(y3, y1_fraction); 35 y0 = _mm_add_pi16(y0, y1); 36 y2 = _mm_add_pi16(y2, y3); 37 y0 = _mm_srli_pi16(y0, 8); 38 y2 = _mm_srli_pi16(y2, 8); 39 y0 = _mm_packs_pu16(y0, y2); 40 *dest64++ = y0; 41 } while (dest64 < end64); 42 } 43 44 } // namespace gfx 45 } // namespace mozilla