mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-23 04:41:11 +00:00
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include <mmintrin.h>
|
|
#include "yuv_row.h"
|
|
|
|
namespace mozilla {
|
|
namespace gfx {
|
|
|
|
// FilterRows combines two rows of the image using linear interpolation.
|
|
// MMX version does 8 pixels at a time.
|
|
void FilterRows_MMX(uint8_t* ybuf, const uint8_t* y0_ptr, const uint8_t* y1_ptr,
|
|
int source_width, int source_y_fraction) {
|
|
__m64 zero = _mm_setzero_si64();
|
|
__m64 y1_fraction = _mm_set1_pi16(source_y_fraction);
|
|
__m64 y0_fraction = _mm_set1_pi16(256 - source_y_fraction);
|
|
|
|
const __m64* y0_ptr64 = reinterpret_cast<const __m64*>(y0_ptr);
|
|
const __m64* y1_ptr64 = reinterpret_cast<const __m64*>(y1_ptr);
|
|
__m64* dest64 = reinterpret_cast<__m64*>(ybuf);
|
|
__m64* end64 = reinterpret_cast<__m64*>(ybuf + source_width);
|
|
|
|
do {
|
|
__m64 y0 = *y0_ptr64++;
|
|
__m64 y1 = *y1_ptr64++;
|
|
__m64 y2 = _mm_unpackhi_pi8(y0, zero);
|
|
__m64 y3 = _mm_unpackhi_pi8(y1, zero);
|
|
y0 = _mm_unpacklo_pi8(y0, zero);
|
|
y1 = _mm_unpacklo_pi8(y1, zero);
|
|
y0 = _mm_mullo_pi16(y0, y0_fraction);
|
|
y1 = _mm_mullo_pi16(y1, y1_fraction);
|
|
y2 = _mm_mullo_pi16(y2, y0_fraction);
|
|
y3 = _mm_mullo_pi16(y3, y1_fraction);
|
|
y0 = _mm_add_pi16(y0, y1);
|
|
y2 = _mm_add_pi16(y2, y3);
|
|
y0 = _mm_srli_pi16(y0, 8);
|
|
y2 = _mm_srli_pi16(y2, 8);
|
|
y0 = _mm_packs_pu16(y0, y2);
|
|
*dest64++ = y0;
|
|
} while (dest64 < end64);
|
|
}
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|