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-rw-r--r--gfx/ycbcr/yuv_convert_mmx.cpp45
1 files changed, 45 insertions, 0 deletions
diff --git a/gfx/ycbcr/yuv_convert_mmx.cpp b/gfx/ycbcr/yuv_convert_mmx.cpp
new file mode 100644
index 000000000..b5353e500
--- /dev/null
+++ b/gfx/ycbcr/yuv_convert_mmx.cpp
@@ -0,0 +1,45 @@
+// 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* ybuf, const uint8* y0_ptr, const uint8* 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