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yuv use scale slope calc

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BUG=none
TEST=drmem
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/5319004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@899 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2013-12-07 00:55:23 +00:00
parent 3f5a860be8
commit aae7deb5cf
4 changed files with 34 additions and 73 deletions
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2
include/libyuv/scale.h
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@ -21,7 +21,7 @@ extern "C" {
// Supported filtering.
enum FilterMode {
kFilterNone = 0, // Point sample; Fastest.
kFilterLinear = 1, // Filter horizontally only.
kFilterLinear = 1, // Filter horizontally only.
kFilterBilinear = 2, // Faster than box, but lower quality scaling down.
kFilterBox = 3 // Highest quality.
};

8
source/planar_functions.cc
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@ -172,10 +172,16 @@ int I420ToI400(const uint8* src_y, int src_stride_y,
return 0;
}
// Mirror a plane of data
// Mirror a plane of data.
void MirrorPlane(const uint8* src_y, int src_stride_y,
uint8* dst_y, int dst_stride_y,
int width, int height) {
// Negative height means invert the image.
if (height < 0) {
height = -height;
src_y = src_y + (height - 1) * src_stride_y;
src_stride_y = -src_stride_y;
}
void (*MirrorRow)(const uint8* src, uint8* dst, int width) = MirrorRow_C;
#if defined(HAS_MIRRORROW_NEON)
if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(width, 16)) {

95
source/scale.cc
View File

@ -382,16 +382,14 @@ static void ScalePlaneBox(int src_width, int src_height,
const uint8* src_ptr, uint8* dst_ptr) {
assert(dst_width > 0);
assert(dst_height > 0);
int dx = FixedDiv(Abs(src_width), dst_width);
int dy = FixedDiv(src_height, dst_height);
// Initial source x/y coordinate and step values as 16.16 fixed point.
int x = 0;
int y = 0;
// Negative src_width means horizontally mirror.
if (src_width < 0) {
x += (dst_width - 1) * dx;
dx = -dx;
src_width = -src_width;
}
int dx = 0;
int dy = 0;
ScaleSlope(src_width, src_height, dst_width, dst_height, kFilterBox,
&x, &y, &dx, &dy);
const int max_y = (src_height << 16);
if (!IS_ALIGNED(src_width, 16) || (src_width > kMaxStride) ||
dst_height * 2 > src_height) {
@ -457,6 +455,14 @@ void ScalePlaneBilinearDown(int src_width, int src_height,
assert(dst_height > 0);
assert(Abs(src_width) <= kMaxStride);
// Initial source x/y coordinate and step values as 16.16 fixed point.
int x = 0;
int y = 0;
int dx = 0;
int dy = 0;
ScaleSlope(src_width, src_height, dst_width, dst_height, filtering,
&x, &y, &dx, &dy);
SIMD_ALIGNED(uint8 row[kMaxStride + 16]);
void (*InterpolateRow)(uint8* dst_ptr, const uint8* src_ptr,
@ -517,28 +523,6 @@ void ScalePlaneBilinearDown(int src_width, int src_height,
}
#endif
int dx = 0;
int dy = 0;
int x = 0;
int y = 0;
if (dst_width <= Abs(src_width)) {
dx = FixedDiv(Abs(src_width), dst_width);
x = (dx >> 1) - 32768;
} else if (dst_width > 1) {
dx = FixedDiv(Abs(src_width) - 1, dst_width - 1);
}
// Negative src_width means horizontally mirror.
if (src_width < 0) {
x += (dst_width - 1) * dx;
dx = -dx;
src_width = -src_width;
}
if (dst_height <= src_height) {
dy = FixedDiv(src_height, dst_height);
y = (dy >> 1) - 32768;
} else if (dst_height > 1) {
dy = FixedDiv(src_height - 1, dst_height - 1);
}
const int max_y = (src_height - 1) << 16;
for (int j = 0; j < dst_height; ++j) {
if (y > max_y) {
@ -570,28 +554,14 @@ void ScalePlaneBilinearUp(int src_width, int src_height,
assert(dst_width > 0);
assert(dst_height > 0);
assert(Abs(dst_width) <= kMaxStride);
int dx = 0;
int dy = 0;
// Initial source x/y coordinate and step values as 16.16 fixed point.
int x = 0;
int y = 0;
if (dst_width <= Abs(src_width)) {
dx = FixedDiv(Abs(src_width), dst_width);
x = (dx >> 1) - 32768;
} else if (dst_width > 1) {
dx = FixedDiv(Abs(src_width) - 1, dst_width - 1);
}
// Negative src_width means horizontally mirror.
if (src_width < 0) {
x += (dst_width - 1) * dx;
dx = -dx;
src_width = -src_width;
}
if (dst_height <= src_height) {
dy = FixedDiv(src_height, dst_height);
y = (dy >> 1) - 32768;
} else if (dst_height > 1) {
dy = FixedDiv(src_height - 1, dst_height - 1);
}
int dx = 0;
int dy = 0;
ScaleSlope(src_width, src_height, dst_width, dst_height, filtering,
&x, &y, &dx, &dy);
void (*InterpolateRow)(uint8* dst_ptr, const uint8* src_ptr,
ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
@ -715,28 +685,13 @@ static void ScalePlaneSimple(int src_width, int src_height,
int dst_width, int dst_height,
int src_stride, int dst_stride,
const uint8* src_ptr, uint8* dst_ptr) {
int dx = 0;
int dy = 0;
// Initial source x/y coordinate and step values as 16.16 fixed point.
int x = 0;
int y = 0;
if (dst_width <= Abs(src_width)) {
dx = FixedDiv(Abs(src_width), dst_width);
x = (dx >> 1) - 32768;
} else if (dst_width > 1) {
dx = FixedDiv(Abs(src_width) - 1, dst_width - 1);
}
// Negative src_width means horizontally mirror.
if (src_width < 0) {
x += (dst_width - 1) * dx;
dx = -dx;
src_width = -src_width;
}
if (dst_height <= src_height) {
dy = FixedDiv(src_height, dst_height);
y = (dy >> 1) - 32768;
} else if (dst_height > 1) {
dy = FixedDiv(src_height - 1, dst_height - 1);
}
int dx = 0;
int dy = 0;
ScaleSlope(src_width, src_height, dst_width, dst_height, kFilterNone,
&x, &y, &dx, &dy);
void (*ScaleCols)(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int x, int dx) = ScaleCols_C;

2
source/scale_common.cc
View File

@ -613,7 +613,7 @@ void ScaleSlope(int src_width, int src_height,
}
if (dst_height <= src_height) {
*dy = FixedDiv(src_height, dst_height);
*y = CENTERSTART(*dy, -32768);
*y = CENTERSTART(*dy, -32768); // 32768 = -0.5 to center bilinear.
} else if (dst_height > 1) {
*dy = FIXEDDIV1(src_height, dst_height);
*y = 0;