first draft
git-svn-id: http://libyuv.googlecode.com/svn/trunk@2 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/row_posix.cc b/source/row_posix.cc
new file mode 100644
index 0000000..61d89a1
--- /dev/null
+++ b/source/row_posix.cc
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2011 The LibYuv project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "row.h"
+
+extern "C" {
+
+#if defined(__x86_64__)
+
+// 64 bit linux gcc version
+
+void FastConvertYUVToRGB32Row(const uint8* y_buf, // rdi
+ const uint8* u_buf, // rsi
+ const uint8* v_buf, // rdx
+ uint8* rgb_buf, // rcx
+ int width) { // r8
+ asm(
+"1:"
+ "movzb (%1),%%r10\n"
+ "lea 1(%1),%1\n"
+ "movzb (%2),%%r11\n"
+ "lea 1(%2),%2\n"
+ "movq 2048(%5,%%r10,8),%%xmm0\n"
+ "movzb (%0),%%r10\n"
+ "movq 4096(%5,%%r11,8),%%xmm1\n"
+ "movzb 0x1(%0),%%r11\n"
+ "paddsw %%xmm1,%%xmm0\n"
+ "movq (%5,%%r10,8),%%xmm2\n"
+ "lea 2(%0),%0\n"
+ "movq (%5,%%r11,8),%%xmm3\n"
+ "paddsw %%xmm0,%%xmm2\n"
+ "paddsw %%xmm0,%%xmm3\n"
+ "shufps $0x44,%%xmm3,%%xmm2\n"
+ "psraw $0x6,%%xmm2\n"
+ "packuswb %%xmm2,%%xmm2\n"
+ "movq %%xmm2,0x0(%3)\n"
+ "lea 8(%3),%3\n"
+ "sub $0x2,%4\n"
+ "ja 1b\n"
+ :
+ : "r"(y_buf), // %0
+ "r"(u_buf), // %1
+ "r"(v_buf), // %2
+ "r"(rgb_buf), // %3
+ "r"(width), // %4
+ "r" (_kCoefficientsRgbY) // %5
+ : "memory", "r10", "r11", "xmm0", "xmm1", "xmm2", "xmm3"
+);
+}
+
+#elif defined(__i386__)
+// 32 bit gcc version
+
+void FastConvertYUVToRGB32Row(const uint8* y_buf,
+ const uint8* u_buf,
+ const uint8* v_buf,
+ uint8* rgb_buf,
+ int width);
+ asm(
+ ".text\n"
+#if defined(OSX) || defined(IOS)
+ ".globl _FastConvertYUVToRGB32Row\n"
+"_FastConvertYUVToRGB32Row:\n"
+#else
+ ".global FastConvertYUVToRGB32Row\n"
+"FastConvertYUVToRGB32Row:\n"
+#endif
+ "pusha\n"
+ "mov 0x24(%esp),%edx\n"
+ "mov 0x28(%esp),%edi\n"
+ "mov 0x2c(%esp),%esi\n"
+ "mov 0x30(%esp),%ebp\n"
+ "mov 0x34(%esp),%ecx\n"
+
+"1:"
+ "movzbl (%edi),%eax\n"
+ "lea 1(%edi),%edi\n"
+ "movzbl (%esi),%ebx\n"
+ "lea 1(%esi),%esi\n"
+ "movq _kCoefficientsRgbY+2048(,%eax,8),%mm0\n"
+ "movzbl (%edx),%eax\n"
+ "paddsw _kCoefficientsRgbY+4096(,%ebx,8),%mm0\n"
+ "movzbl 0x1(%edx),%ebx\n"
+ "movq _kCoefficientsRgbY(,%eax,8),%mm1\n"
+ "lea 2(%edx),%edx\n"
+ "movq _kCoefficientsRgbY(,%ebx,8),%mm2\n"
+ "paddsw %mm0,%mm1\n"
+ "paddsw %mm0,%mm2\n"
+ "psraw $0x6,%mm1\n"
+ "psraw $0x6,%mm2\n"
+ "packuswb %mm2,%mm1\n"
+ "movntq %mm1,0x0(%ebp)\n"
+ "lea 8(%ebp),%ebp\n"
+ "sub $0x2,%ecx\n"
+ "ja 1b\n"
+ "popa\n"
+ "ret\n"
+);
+
+#else
+// C reference code that mimic the YUV assembly.
+#define packuswb(x) ((x) < 0 ? 0 : ((x) > 255 ? 255 : (x)))
+#define paddsw(x, y) (((x) + (y)) < -32768 ? -32768 : \
+ (((x) + (y)) > 32767 ? 32767 : ((x) + (y))))
+
+static inline void YuvPixel(uint8 y,
+ uint8 u,
+ uint8 v,
+ uint8* rgb_buf) {
+
+ int b = _kCoefficientsRgbY[256+u][0];
+ int g = _kCoefficientsRgbY[256+u][1];
+ int r = _kCoefficientsRgbY[256+u][2];
+ int a = _kCoefficientsRgbY[256+u][3];
+
+ b = paddsw(b, _kCoefficientsRgbY[512+v][0]);
+ g = paddsw(g, _kCoefficientsRgbY[512+v][1]);
+ r = paddsw(r, _kCoefficientsRgbY[512+v][2]);
+ a = paddsw(a, _kCoefficientsRgbY[512+v][3]);
+
+ b = paddsw(b, _kCoefficientsRgbY[y][0]);
+ g = paddsw(g, _kCoefficientsRgbY[y][1]);
+ r = paddsw(r, _kCoefficientsRgbY[y][2]);
+ a = paddsw(a, _kCoefficientsRgbY[y][3]);
+
+ b >>= 6;
+ g >>= 6;
+ r >>= 6;
+ a >>= 6;
+
+ *reinterpret_cast<uint32*>(rgb_buf) = (packuswb(b)) |
+ (packuswb(g) << 8) |
+ (packuswb(r) << 16) |
+ (packuswb(a) << 24);
+}
+
+void FastConvertYUVToRGB32Row(const uint8* y_buf,
+ const uint8* u_buf,
+ const uint8* v_buf,
+ uint8* rgb_buf,
+ int width) {
+ for (int x = 0; x < width; x += 2) {
+ uint8 u = u_buf[x >> 1];
+ uint8 v = v_buf[x >> 1];
+ uint8 y0 = y_buf[x];
+ YuvPixel(y0, u, v, rgb_buf);
+ if ((x + 1) < width) {
+ uint8 y1 = y_buf[x + 1];
+ YuvPixel(y1, u, v, rgb_buf + 4);
+ }
+ rgb_buf += 8; // Advance 2 pixels.
+ }
+}
+#endif
+
+} // extern "C"