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Diffstat (limited to 'media/base/yuv_row_mac.cc')
-rw-r--r--media/base/yuv_row_mac.cc331
1 files changed, 270 insertions, 61 deletions
diff --git a/media/base/yuv_row_mac.cc b/media/base/yuv_row_mac.cc
index 1f33317..c80b213 100644
--- a/media/base/yuv_row_mac.cc
+++ b/media/base/yuv_row_mac.cc
@@ -4,9 +4,17 @@
#include "media/base/yuv_row.h"
+#ifdef _DEBUG
+#include "base/logging.h"
+#else
+#define DCHECK(a)
+#endif
+
+// TODO(fbarchard): Make MMX work in DLLs. Currently only works in unittests.
// TODO(fbarchard): Do 64 bit version.
extern "C" {
+#if USE_MMX
#define RGBY(i) { \
static_cast<int16>(1.164 * 64 * (i - 16) + 0.5), \
@@ -29,8 +37,7 @@ extern "C" {
0 \
}
-#define MMX_ALIGNED(var) \
- var __attribute__ ((section ("__TEXT,__text"))) __attribute__ ((aligned(16)))
+#define MMX_ALIGNED(var) var __attribute__((aligned(16)))
MMX_ALIGNED(int16 kCoefficientsRgbY[256][4]) = {
RGBY(0x00), RGBY(0x01), RGBY(0x02), RGBY(0x03),
@@ -238,36 +245,75 @@ MMX_ALIGNED(int16 kCoefficientsRgbV[256][4]) = {
#undef RGBV
#undef MMX_ALIGNED
-extern void MacConvertYUVToRGB32Row(const uint8* y_buf,
- const uint8* u_buf,
- const uint8* v_buf,
- uint8* rgb_buf,
- int width,
- int16 *kCoefficientsRgbY);
+// TODO(fbarchard): Use the following function instead of
+// pure assembly to help make code more portable to 64 bit
+// and Mac, which has different labels.
+// no-gcse eliminates the frame pointer, freeing up ebp.
+
+#if defined(FUTURE_64BIT_VERSION)
+void __attribute__((optimize("O2", "no-gcse")))
+ NewFastConvertYUVToRGB32Row(const uint8* y_buf,
+ const uint8* u_buf,
+ const uint8* v_buf,
+ uint8* rgb_buf,
+ int width) {
+ asm(
+ "shr %4\n"
+"1:\n"
+ "movzb (%1),%%eax\n"
+ "add $0x1,%1\n"
+ "movzb (%2),%%ebx\n"
+ "add $0x1,%2\n"
+ "movq kCoefficientsRgbU(,%%eax,8),%%mm0\n"
+ "movzb (%0),%%eax\n"
+ "paddsw kCoefficientsRgbV(,%%ebx,8),%%mm0\n"
+ "movzb 0x1(%0),%%ebx\n"
+ "movq kCoefficientsRgbY(,%%eax,8),%%mm1\n"
+ "add $0x2,%0\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(%3)\n"
+ "add $0x8,%3\n"
+ "sub $0x1,%4\n"
+ "jne 1b\n"
+ : : "r"(y_buf),"r"(u_buf),"r"(v_buf),"r"(rgb_buf),"r"(width)
+ : "eax","ebx");
+}
+#endif
+
+extern void FastConvertYUVToRGB32Row(const uint8* y_buf,
+ const uint8* u_buf,
+ const uint8* v_buf,
+ uint8* rgb_buf,
+ int width);
+
__asm__(
-" .globl _MacConvertYUVToRGB32Row\n"
-"_MacConvertYUVToRGB32Row:\n"
+" .globl _FastConvertYUVToRGB32Row\n"
+"_FastConvertYUVToRGB32Row:\n"
"pusha\n"
"mov 0x24(%esp),%edx\n"
"mov 0x28(%esp),%edi\n"
"mov 0x2c(%esp),%esi\n"
"mov 0x30(%esp),%ebp\n"
- "mov 0x38(%esp),%ecx\n"
-
- "jmp Lconvertend\n"
+ "mov 0x34(%esp),%ecx\n"
+ "jmp convertend\n"
-"Lconvertloop:"
+"convertloop:"
"movzbl (%edi),%eax\n"
"add $0x1,%edi\n"
"movzbl (%esi),%ebx\n"
"add $0x1,%esi\n"
- "movq 2048(%ecx,%eax,8),%mm0\n"
+ "movq _kCoefficientsRgbU(,%eax,8),%mm0\n"
"movzbl (%edx),%eax\n"
- "paddsw 4096(%ecx,%ebx,8),%mm0\n"
+ "paddsw _kCoefficientsRgbV(,%ebx,8),%mm0\n"
"movzbl 0x1(%edx),%ebx\n"
- "movq 0(%ecx,%eax,8),%mm1\n"
+ "movq _kCoefficientsRgbY(,%eax,8),%mm1\n"
"add $0x2,%edx\n"
- "movq 0(%ecx,%ebx,8),%mm2\n"
+ "movq _kCoefficientsRgbY(,%ebx,8),%mm2\n"
"paddsw %mm0,%mm1\n"
"paddsw %mm0,%mm2\n"
"psraw $0x6,%mm1\n"
@@ -275,76 +321,67 @@ extern void MacConvertYUVToRGB32Row(const uint8* y_buf,
"packuswb %mm2,%mm1\n"
"movntq %mm1,0x0(%ebp)\n"
"add $0x8,%ebp\n"
-"Lconvertend:"
- "sub $0x2,0x34(%esp)\n"
- "jns Lconvertloop\n"
+"convertend:"
+ "sub $0x2,%ecx\n"
+ "jns convertloop\n"
- "and $0x1,0x34(%esp)\n"
- "je Lconvertdone\n"
+ "and $0x1,%ecx\n"
+ "je convertdone\n"
"movzbl (%edi),%eax\n"
- "movq 2048(%ecx,%eax,8),%mm0\n"
+ "movq _kCoefficientsRgbU(,%eax,8),%mm0\n"
"movzbl (%esi),%eax\n"
- "paddsw 4096(%ecx,%eax,8),%mm0\n"
+ "paddsw _kCoefficientsRgbV(,%eax,8),%mm0\n"
"movzbl (%edx),%eax\n"
- "movq 0(%ecx,%eax,8),%mm1\n"
+ "movq _kCoefficientsRgbY(,%eax,8),%mm1\n"
"paddsw %mm0,%mm1\n"
"psraw $0x6,%mm1\n"
"packuswb %mm1,%mm1\n"
"movd %mm1,0x0(%ebp)\n"
-"Lconvertdone:\n"
+"convertdone:"
"popa\n"
"ret\n"
);
-void FastConvertYUVToRGB32Row(const uint8* y_buf,
- const uint8* u_buf,
- const uint8* v_buf,
- uint8* rgb_buf,
- int width) {
- MacConvertYUVToRGB32Row(y_buf, u_buf, v_buf, rgb_buf, width,
- &kCoefficientsRgbY[0][0]);
-}
-extern void MacScaleYUVToRGB32Row(const uint8* y_buf,
+extern void ScaleYUVToRGB32Row(const uint8* y_buf,
const uint8* u_buf,
const uint8* v_buf,
uint8* rgb_buf,
int width,
- int scaled_dx,
- int16 *kCoefficientsRgbY);
+ int scaled_dx);
__asm__(
-" .globl _MacScaleYUVToRGB32Row\n"
-"_MacScaleYUVToRGB32Row:\n"
+" .globl _ScaleYUVToRGB32Row\n"
+"_ScaleYUVToRGB32Row:\n"
"pusha\n"
"mov 0x24(%esp),%edx\n"
"mov 0x28(%esp),%edi\n"
"mov 0x2c(%esp),%esi\n"
"mov 0x30(%esp),%ebp\n"
- "mov 0x3c(%esp),%ecx\n"
+ "mov 0x34(%esp),%ecx\n"
"xor %ebx,%ebx\n"
- "jmp Lscaleend\n"
+ "jmp scaleend\n"
-"Lscaleloop:"
+"scaleloop:"
"mov %ebx,%eax\n"
"sar $0x5,%eax\n"
"movzbl (%edi,%eax,1),%eax\n"
- "movq 2048(%ecx,%eax,8),%mm0\n"
+ "movq kCoefficientsRgbU(,%eax,8),%mm0\n"
"mov %ebx,%eax\n"
"sar $0x5,%eax\n"
"movzbl (%esi,%eax,1),%eax\n"
- "paddsw 4096(%ecx,%eax,8),%mm0\n"
+ "paddsw kCoefficientsRgbV(,%eax,8),%mm0\n"
"mov %ebx,%eax\n"
"add 0x38(%esp),%ebx\n"
"sar $0x4,%eax\n"
"movzbl (%edx,%eax,1),%eax\n"
- "movq 0(%ecx,%eax,8),%mm1\n"
+ "movq kCoefficientsRgbY(,%eax,8),%mm1\n"
"mov %ebx,%eax\n"
"add 0x38(%esp),%ebx\n"
"sar $0x4,%eax\n"
"movzbl (%edx,%eax,1),%eax\n"
- "movq 0(%ecx,%eax,8),%mm2\n"
+ "movq kCoefficientsRgbY(,%eax,8),%mm2\n"
"paddsw %mm0,%mm1\n"
"paddsw %mm0,%mm2\n"
"psraw $0x6,%mm1\n"
@@ -352,29 +389,29 @@ extern void MacScaleYUVToRGB32Row(const uint8* y_buf,
"packuswb %mm2,%mm1\n"
"movntq %mm1,0x0(%ebp)\n"
"add $0x8,%ebp\n"
-"Lscaleend:"
- "sub $0x2,0x34(%esp)\n"
- "jns Lscaleloop\n"
+"scaleend:"
+ "sub $0x2,%ecx\n"
+ "jns scaleloop\n"
- "and $0x1,0x34(%esp)\n"
- "je Lscaledone\n"
+ "and $0x1,%ecx\n"
+ "je scaledone\n"
"mov %ebx,%eax\n"
"sar $0x5,%eax\n"
"movzbl (%edi,%eax,1),%eax\n"
- "movq 2048(%ecx,%eax,8),%mm0\n"
+ "movq kCoefficientsRgbU(,%eax,8),%mm0\n"
"mov %ebx,%eax\n"
"sar $0x5,%eax\n"
"movzbl (%esi,%eax,1),%eax\n"
- "paddsw 4096(%ecx,%eax,8),%mm0\n"
+ "paddsw kCoefficientsRgbV(,%eax,8),%mm0\n"
"mov %ebx,%eax\n"
"sar $0x4,%eax\n"
"movzbl (%edx,%eax,1),%eax\n"
- "movq 0(%ecx,%eax,8),%mm1\n"
+ "movq kCoefficientsRgbY(,%eax,8),%mm1\n"
"mov %ebx,%eax\n"
"sar $0x4,%eax\n"
"movzbl (%edx,%eax,1),%eax\n"
- "movq 0(%ecx,%eax,8),%mm2\n"
+ "movq kCoefficientsRgbY(,%eax,8),%mm2\n"
"paddsw %mm0,%mm1\n"
"paddsw %mm0,%mm2\n"
"psraw $0x6,%mm1\n"
@@ -382,22 +419,194 @@ extern void MacScaleYUVToRGB32Row(const uint8* y_buf,
"packuswb %mm2,%mm1\n"
"movd %mm1,0x0(%ebp)\n"
-"Lscaledone:"
+"scaledone:"
"popa\n"
"ret\n"
);
+#else // USE_MMX
+
+// Reference version of YUV converter.
+static const int kClipTableSize = 256;
+static const int kClipOverflow = 288; // Cb max is 535.
+
+static uint8 kRgbClipTable[kClipOverflow +
+ kClipTableSize +
+ kClipOverflow] = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 288 underflow values
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // clipped to 0.
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // Unclipped values.
+ 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
+ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+ 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+ 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+ 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+ 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
+ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+ 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
+ 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+ 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
+ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+ 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
+ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
+ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+ 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
+ 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
+ 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
+ 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
+ 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
+ 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
+ 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
+ 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
+ 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
+ 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
+ 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
+ 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
+ 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 288 overflow values
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // clipped to 255.
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+};
+
+// Clip an rgb channel value to 0..255 range.
+// Source is signed fixed point 8.8.
+// Table allows for values to underflow or overflow by 128.
+// Therefore source range is -128 to 384.
+// Output clips to unsigned 0 to 255.
+static inline uint32 clip(int32 value) {
+ DCHECK(((value >> 8) + kClipOverflow) >= 0);
+ DCHECK(((value >> 8) + kClipOverflow) <
+ (kClipOverflow + kClipTableSize + kClipOverflow));
+ return static_cast<uint32>(kRgbClipTable[((value) >> 8) + kClipOverflow]);
+}
+
+static inline void YuvPixel(uint8 y,
+ uint8 u,
+ uint8 v,
+ uint8* rgb_buf) {
+ int32 d = static_cast<int32>(u) - 128;
+ int32 e = static_cast<int32>(v) - 128;
+
+ int32 cb = (516 * d + 128);
+ int32 cg = (- 100 * d - 208 * e + 128);
+ int32 cr = (409 * e + 128);
+ int32 C298a = ((static_cast<int32>(y) - 16) * 298 + 128);
+ *reinterpret_cast<uint32*>(rgb_buf) = (clip(C298a + cb)) |
+ (clip(C298a + cg) << 8) |
+ (clip(C298a + cr) << 16) |
+ (0xff000000);
+}
+
+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.
+ }
+}
+
+// 28.4 fixed point is used. A shift by 4 isolates the integer.
+// A shift by 5 is used to further subsample the chrominence channels.
+// & 15 isolates the fixed point fraction. >> 2 to get the upper 2 bits,
+// for 1/4 pixel accurate interpolation.
void ScaleYUVToRGB32Row(const uint8* y_buf,
const uint8* u_buf,
const uint8* v_buf,
uint8* rgb_buf,
int width,
int scaled_dx) {
-
- MacScaleYUVToRGB32Row(y_buf, u_buf, v_buf, rgb_buf, width, scaled_dx,
- &kCoefficientsRgbY[0][0]);
+ int scaled_x = 0;
+ for (int x = 0; x < width; ++x) {
+ uint8 u = u_buf[scaled_x >> 5];
+ uint8 v = v_buf[scaled_x >> 5];
+ uint8 y0 = y_buf[scaled_x >> 4];
+ YuvPixel(y0, u, v, rgb_buf);
+ rgb_buf += 4;
+ scaled_x += scaled_dx;
+ }
}
-
+#endif // USE_MMX
} // extern "C"
generated by cgit v1.1 at 2025-01-19 15:25:25 +0000