coffee/libyuv
1
0
Fork 0
mirror of https://chromium.googlesource.com/libyuv/libyuv synced 2025-12-07 17:26:49 +08:00
Code Issues Packages Projects Releases Wiki Activity

change Y multiplier and bias to compensate for 257/256 which makes YToARGB exactly match float math.

Browse Source 
Histogram Before
hist            -3      -2      -1      0       1       2       3
red             0       0       1809408 13140736        1827072 0       0
green           0       0       1679912 13471329        1625975 0       0
blue            168448  994816  1876480 10655488        1893376 1006336 182272
Histogram After
hist            -3      -2      -1      0       1       2       3
red             0       0       558848  15632128        586240  0       0
green           0       0       209907  16350588        216721  0       0
blue            14848   642816  1989376 11363328        2053120 695040  18688
BUG=394
TESTED=more stringent luma tests
R=brucedawson@google.com

Review URL: https://webrtc-codereview.appspot.com/38859004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1259 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2015-02-04 19:45:26 +00:00
parent 3982998c7c
commit c4e032c543
7 changed files with 34 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.chromium
View File

@ -1,6 +1,6 @@
Name: libyuv
URL: http://code.google.com/p/libyuv/
Version: 1258
Version: 1259
License: BSD
License File: LICENSE

2
include/libyuv/version.h
View File

@ -11,6 +11,6 @@
#ifndef INCLUDE_LIBYUV_VERSION_H_ // NOLINT
#define INCLUDE_LIBYUV_VERSION_H_
#define LIBYUV_VERSION 1258
#define LIBYUV_VERSION 1259
#endif // INCLUDE_LIBYUV_VERSION_H_ NOLINT

5
source/row_common.cc
View File

@ -962,8 +962,9 @@ void I400ToARGBRow_C(const uint8* src_y, uint8* dst_argb, int width) {
// YUV to RGB conversion constants.
// Y contribution to R,G,B. Scale and bias.
#define YG 19071 /* round(1.164 * 64 * 256) */
#define YGB 1197 /* 1.164 * 64 * 16 - adjusted for even error distribution */
// TODO(fbarchard): Consider moving constants into a common header.
#define YG 18997 /* round(1.164 * 64 * 256 * 256 / 257) */
#define YGB 1160 /* 1.164 * 64 * 16 - adjusted for even error distribution */
// U and V contributions to R,G,B.
#define UB -128 /* -min(128, round(2.018 * 64)) */

16
source/row_posix.cc
View File

@ -1522,8 +1522,8 @@ void RGBAToUVRow_SSSE3(const uint8* src_rgba0, int src_stride_rgba,
// YUV to RGB conversion constants.
// Y contribution to R,G,B. Scale and bias.
#define YG 19071 /* round(1.164 * 64 * 256) */
#define YGB 1197 /* 1.164 * 64 * 16 - adjusted for even error distribution */
#define YG 18997 /* round(1.164 * 64 * 256 * 256 / 257) */
#define YGB 1160 /* 1.164 * 64 * 16 - adjusted for even error distribution */
// U and V contributions to R,G,B.
#define UB -128 /* -min(128, round(2.018 * 64)) */
@ -2296,14 +2296,14 @@ void YToARGBRow_SSE2(const uint8* y_buf,
uint8* dst_argb,
int width) {
asm volatile (
"pcmpeqb %%xmm4,%%xmm4 \n"
"pslld $0x18,%%xmm4 \n"
"mov $0x04ad04ad,%%eax \n" // 04ad = 1197 = 1.164 * 16
"movd %%eax,%%xmm3 \n"
"pshufd $0x0,%%xmm3,%%xmm3 \n"
"mov $0x4a7f4a7f,%%eax \n" // 4a7f = 19071 = 1.164
"mov $0x4a354a35,%%eax \n" // 4a35 = 18997 = 1.164
"movd %%eax,%%xmm2 \n"
"pshufd $0x0,%%xmm2,%%xmm2 \n"
"mov $0x04880488,%%eax \n" // 0488 = 1160 = 1.164 * 16
"movd %%eax,%%xmm3 \n"
"pshufd $0x0,%%xmm3,%%xmm3 \n"
"pcmpeqb %%xmm4,%%xmm4 \n"
"pslld $0x18,%%xmm4 \n"
LABELALIGN
"1: \n"
// Step 1: Scale Y contribution to 8 G values. G = (y - 16) * 1.164

28
source/row_win.cc
View File

@ -26,8 +26,8 @@ extern "C" {
// YUV to RGB conversion constants.
// Y contribution to R,G,B. Scale and bias.
#define YG 19071 /* round(1.164 * 64 * 256) */
#define YGB 1197 /* 1.164 * 64 * 16 - adjusted for even error distribution */
#define YG 18997 /* round(1.164 * 64 * 256 * 256 / 257) */
#define YGB 1160 /* 1.164 * 64 * 16 - adjusted for even error distribution */
// U and V contributions to R,G,B.
#define UB -128 /* -min(128, round(2.018 * 64)) */
@ -2306,14 +2306,14 @@ void YToARGBRow_SSE2(const uint8* y_buf,
uint8* rgb_buf,
int width) {
__asm {
pcmpeqb xmm4, xmm4 // generate mask 0xff000000
pslld xmm4, 24
mov eax, 0x04ad04ad // 04ad = 1197 = round(1.164 * 64 * 16)
movd xmm3, eax
pshufd xmm3, xmm3, 0
mov eax, 0x4a7f4a7f // 4a7f = 19071 = round(1.164 * 64 * 256)
mov eax, 0x4a354a35 // 4a35 = 18997 = round(1.164 * 64 * 256)
movd xmm2, eax
pshufd xmm2, xmm2,0
mov eax, 0x04880488 // 0488 = 1160 = round(1.164 * 64 * 16)
movd xmm3, eax
pshufd xmm3, xmm3, 0
pcmpeqb xmm4, xmm4 // generate mask 0xff000000
pslld xmm4, 24
mov eax, [esp + 4] // Y
mov edx, [esp + 8] // rgb
@ -2348,6 +2348,7 @@ void YToARGBRow_SSE2(const uint8* y_buf,
#ifdef HAS_YTOARGBROW_AVX2
// 16 pixels of Y converted to 16 pixels of ARGB (64 bytes).
// note: vpunpcklbw mutates and vpackuswb unmutates.
__declspec(naked) __declspec(align(16))
void YToARGBRow_AVX2(const uint8* y_buf,
uint8* rgb_buf,
@ -2355,10 +2356,10 @@ void YToARGBRow_AVX2(const uint8* y_buf,
__asm {
vpcmpeqb ymm4, ymm4, ymm4 // generate mask 0xff000000
vpslld ymm4, ymm4, 24
mov eax, 0x04ad04ad // 04ad = 1197 = round(1.164 * 64 * 16)
mov eax, 0x04880488 // 0488 = 1160 = round(1.164 * 64 * 16)
vmovd xmm3, eax
vbroadcastss ymm3, xmm3
mov eax, 0x4a7f4a7f // 4a7f = 19071 = round(1.164 * 64 * 256)
mov eax, 0x4a354a35 // 4a35 = 18997 = round(1.164 * 64 * 256)
vmovd xmm2, eax
vbroadcastss ymm2, xmm2
@ -2370,7 +2371,7 @@ void YToARGBRow_AVX2(const uint8* y_buf,
// Step 1: Scale Y contribution to 16 G values. G = (y - 16) * 1.164
vmovdqu xmm0, [eax]
lea eax, [eax + 16]
vpermq ymm0, ymm0, 0xd8
vpermq ymm0, ymm0, 0xd8 // vpunpcklbw mutates
vpunpcklbw ymm0, ymm0, ymm0 // Y.Y
vpmulhuw ymm0, ymm0, ymm2
vpsubusw ymm0, ymm0, ymm3
@ -2381,8 +2382,8 @@ void YToARGBRow_AVX2(const uint8* y_buf,
// Step 2: Weave into ARGB
vpunpcklbw ymm1, ymm0, ymm0 // GG - mutates
vpermq ymm1, ymm1, 0xd8
vpunpcklwd ymm0, ymm1, ymm1 // GGGG first 4 pixels
vpunpckhwd ymm1, ymm1, ymm1 // GGGG next 4 pixels
vpunpcklwd ymm0, ymm1, ymm1 // GGGG first 8 pixels
vpunpckhwd ymm1, ymm1, ymm1 // GGGG next 8 pixels
vpor ymm0, ymm0, ymm4
vpor ymm1, ymm1, ymm4
vmovdqu [edx], ymm0
@ -2396,7 +2397,6 @@ void YToARGBRow_AVX2(const uint8* y_buf,
}
#endif // HAS_YTOARGBROW_AVX2
#ifdef HAS_MIRRORROW_SSSE3
// Shuffle table for reversing the bytes.
static const uvec8 kShuffleMirror = {

12
unit_test/color_test.cc
View File

@ -227,7 +227,7 @@ TEST_F(libyuvTest, TestYUV) {
EXPECT_EQ(255, b0);
YUVToRGB(240, 255, 0, &r1, &g1, &b1);
EXPECT_NEAR(56, r1, 1);
EXPECT_EQ(57, r1);
EXPECT_EQ(255, g1);
EXPECT_EQ(255, b1);
@ -238,9 +238,9 @@ TEST_F(libyuvTest, TestYUV) {
EXPECT_EQ(2, b0);
YUVToRGB(240, 0, 0, &r1, &g1, &b1);
EXPECT_NEAR(56, r1, 1);
EXPECT_EQ(57, r1);
EXPECT_EQ(255, g1);
EXPECT_NEAR(6, b1, 1);
EXPECT_EQ(5, b1);
for (int i = 0; i < 256; ++i) {
YUVToRGBReference(i, 128, 128, &r0, &g0, &b0);
@ -281,9 +281,9 @@ TEST_F(libyuvTest, TestGreyYUV) {
YUVToRGBReference(y, 128, 128, &r0, &g0, &b0);
YUVToRGB(y, 128, 128, &r1, &g1, &b1);
YToRGB(y, &r2, &g2, &b2);
EXPECT_NEAR(r0, r1, ERROR_R);
EXPECT_NEAR(g0, g1, ERROR_G);
EXPECT_NEAR(b0, b1, ERROR_B);
EXPECT_EQ(r0, r1);
EXPECT_EQ(g0, g1);
EXPECT_EQ(b0, b1);
EXPECT_EQ(r1, r2);
EXPECT_EQ(g1, g2);
EXPECT_EQ(b1, b2);

2
unit_test/convert_test.cc
View File

@ -1262,7 +1262,7 @@ TEST_F(libyuvTest, TestYToARGB) {
argb[i * 4 + 3]);
}
for (int i = 0; i < 32; ++i) {
EXPECT_NEAR(expectedg[i], argb[i * 4 + 0], 1);
EXPECT_EQ(expectedg[i], argb[i * 4 + 0]);
}
}