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ScaleFilterRows optimized for NEON.

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Includes unit test that scales the image up by 2.
Currently this is done using the generic bilinear scale.
Review URL: http://webrtc-codereview.appspot.com/330032

git-svn-id: http://libyuv.googlecode.com/svn/trunk@126 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
frkoenig@google.com 2012-01-04 23:04:07 +00:00
parent 17f198cd46
commit ea8d0eb0d1
3 changed files with 86 additions and 9 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 Name: libyuv
URL: http://code.google.com/p/libyuv/ URL: http://code.google.com/p/libyuv/
Version: 125 Version: 126
License: BSD License: BSD
License File: LICENSE License File: LICENSE

61
source/scale.cc
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@ -502,6 +502,61 @@ static void ScaleRowDown38_2_Int_NEON(const uint8* src_ptr, int src_stride,
); );
} }
// 16x2 -> 16x1
#define HAS_SCALEFILTERROWS_NEON
static void ScaleFilterRows_NEON(uint8* dst_ptr,
const uint8* src_ptr, int src_stride,
int dst_width, int source_y_fraction) {
asm volatile (
"cmp %4, #0 \n"
"beq 2f \n"
"add %2, %1 \n"
"cmp %4, #128 \n"
"beq 3f \n"
"vdup.8 d5, %4 \n"
"rsb %4, #256 \n"
"vdup.8 d4, %4 \n"
"1: \n"
"vld1.u8 {q0}, [%1]! \n"
"vld1.u8 {q1}, [%2]! \n"
"subs %3, #16 \n"
"vmull.u8 q13, d0, d4 \n"
"vmull.u8 q14, d1, d4 \n"
"vmlal.u8 q13, d2, d5 \n"
"vmlal.u8 q14, d3, d5 \n"
"vrshrn.u16 d0, q13, #8 \n"
"vrshrn.u16 d1, q14, #8 \n"
"vst1.u8 {q0}, [%0]! \n"
"bhi 1b \n"
"b 4f \n"
"2: \n"
"vld1.u8 {q0}, [%1]! \n"
"subs %3, #16 \n"
"vst1.u8 {q0}, [%0]! \n"
"bhi 2b \n"
"b 4f \n"
"3: \n"
"vld1.u8 {q0}, [%1]! \n"
"vld1.u8 {q1}, [%2]! \n"
"subs %3, #16 \n"
"vrhadd.u8 q0, q1 \n"
"vst1.u8 {q0}, [%0]! \n"
"bhi 3b \n"
"4: \n"
"vst1.u8 {d1[7]}, [%0] \n"
: "+r"(dst_ptr), // %0
"+r"(src_ptr), // %1
"+r"(src_stride), // %2
"+r"(dst_width), // %3
"+r"(source_y_fraction) // %4
:
: "q0", "q1", "d4", "d5", "q13", "q14", "memory", "cc"
);
}
/** /**
* SSE2 downscalers with interpolation. * SSE2 downscalers with interpolation.
* *
@ -3471,6 +3526,12 @@ void ScalePlaneBilinear(int src_width, int src_height,
int dst_width, int source_y_fraction); int dst_width, int source_y_fraction);
void (*ScaleFilterCols)(uint8* dst_ptr, const uint8* src_ptr, void (*ScaleFilterCols)(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int dx); int dst_width, int dx);
#if defined(HAS_SCALEFILTERROWS_NEON)
if (TestCpuFlag(kCpuHasNEON) &&
IS_ALIGNED(src_width, 16)) {
ScaleFilterRows = ScaleFilterRows_NEON;
} else
#endif
#if defined(HAS_SCALEFILTERROWS_SSSE3) #if defined(HAS_SCALEFILTERROWS_SSSE3)
if (TestCpuFlag(kCpuHasSSSE3) && if (TestCpuFlag(kCpuHasSSSE3) &&
IS_ALIGNED(src_stride, 16) && IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(src_stride, 16) && IS_ALIGNED(src_ptr, 16) &&

32
unit_test/scale_test.cc
View File

@ -153,8 +153,8 @@ TEST_F(libyuvTest, ScaleDownBy2) {
const int src_width = 1280; const int src_width = 1280;
const int src_height = 720; const int src_height = 720;
const int dst_width = src_width >> 1; const int dst_width = src_width / 2;
const int dst_height = src_height >> 1; const int dst_height = src_height / 2;
int err = 0; int err = 0;
for (int f = 0; f < 3; ++f) for (int f = 0; f < 3; ++f)
@ -169,8 +169,8 @@ TEST_F(libyuvTest, ScaleDownBy4) {
const int src_width = 1280; const int src_width = 1280;
const int src_height = 720; const int src_height = 720;
const int dst_width = src_width >> 2; const int dst_width = src_width / 4;
const int dst_height = src_height >> 2; const int dst_height = src_height / 4;
int err = 0; int err = 0;
for (int f = 0; f < 3; ++f) for (int f = 0; f < 3; ++f)
@ -185,8 +185,8 @@ TEST_F(libyuvTest, ScaleDownBy34) {
const int src_width = 1280; const int src_width = 1280;
const int src_height = 720; const int src_height = 720;
const int dst_width = (src_width*3) >> 2; const int dst_width = src_width * 3 / 4;
const int dst_height = (src_height*3) >> 2; const int dst_height = src_height * 3 / 4;
int err = 0; int err = 0;
for (int f = 0; f < 3; ++f) for (int f = 0; f < 3; ++f)
@ -200,8 +200,24 @@ TEST_F(libyuvTest, ScaleDownBy34) {
TEST_F(libyuvTest, ScaleDownBy38) { TEST_F(libyuvTest, ScaleDownBy38) {
int src_width = 1280; int src_width = 1280;
int src_height = 720; int src_height = 720;
int dst_width = (src_width*3) >> 3; int dst_width = src_width * 3 / 8;
int dst_height = (src_height*3) >> 3; int dst_height = src_height * 3 / 8;
int err = 0;
for (int f = 0; f < 3; ++f)
err += TestFilter (src_width, src_height,
dst_width, dst_height,
static_cast<FilterMode>(f));
EXPECT_EQ(0, err);
}
TEST_F(libyuvTest, ScalePlaneBilinear) {
int src_width = 1280;
int src_height = 720;
int dst_width = 1366;
int dst_height = 768;
int err = 0; int err = 0;