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Faster point samplers using row functions and specialized 2x upsampler.

Browse Source 
BUG=none
TEST=none
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/3859004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@854 16f28f9a-4ce2-e073-06de-1de4eb20be90
This commit is contained in:
fbarchard@google.com 2013-11-14 02:03:32 +00:00
parent a2311691c6
commit e8c74b61d3
4 changed files with 296 additions and 131 deletions
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2
README.chromium
View File

@ -1,6 +1,6 @@
Name: libyuv
URL: http://code.google.com/p/libyuv/
Version: 854
Version: 855
License: BSD
License File: LICENSE

2
include/libyuv/version.h
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@ -11,6 +11,6 @@
#ifndef INCLUDE_LIBYUV_VERSION_H_ // NOLINT
#define INCLUDE_LIBYUV_VERSION_H_
#define LIBYUV_VERSION 854
#define LIBYUV_VERSION 855
#endif // INCLUDE_LIBYUV_VERSION_H_ NOLINT

268
source/scale.cc
View File

@ -953,11 +953,76 @@ static void ScaleFilterCols_SSSE3(uint8* dst_ptr, const uint8* src_ptr,
}
}
#define HAS_SCALECOLSUP2_SSE2
// Reads 16 pixels, duplicates them and writes 32 pixels.
// Alignment requirement: src_argb 16 byte aligned, dst_argb 16 byte aligned.
__declspec(naked) __declspec(align(16))
void ScaleColsUp2_SSE2(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int /* x */, int /* dx */) {
__asm {
mov edx, [esp + 4] // dst_ptr
mov eax, [esp + 8] // src_ptr
mov ecx, [esp + 12] // dst_width
align 16
wloop:
movdqa xmm0, [eax]
lea eax, [eax + 16]
movdqa xmm1, xmm0
punpcklbw xmm0, xmm0
punpckhbw xmm1, xmm1
sub ecx, 32
movdqa [edx], xmm0
movdqa [edx + 16], xmm1
lea edx, [edx + 32]
jg wloop
ret
}
}
#elif !defined(LIBYUV_DISABLE_X86) && \
((defined(__x86_64__) && !defined(__native_client__)) || defined(__i386__))
// TODO(nfullagar): For Native Client: When new toolchain becomes available,
// take advantage of bundle lock / unlock feature. This will reduce the amount
// of manual bundle alignment done below, and bundle alignment could even be
// moved into each macro that doesn't use %%nacl: such as MEMOPREG.
#if defined(__native_client__) && defined(__x86_64__)
#define MEMACCESS(base) "%%nacl:(%%r15,%q" #base ")"
#define MEMACCESS2(offset, base) "%%nacl:" #offset "(%%r15,%q" #base ")"
#define MEMLEA(offset, base) #offset "(%q" #base ")"
#define MEMLEA3(offset, index, scale) \
#offset "(,%q" #index "," #scale ")"
#define MEMLEA4(offset, base, index, scale) \
#offset "(%q" #base ",%q" #index "," #scale ")"
#define MEMOPREG(opcode, offset, base, index, scale, reg) \
"lea " #offset "(%q" #base ",%q" #index "," #scale "),%%r14d\n" \
#opcode " (%%r15,%%r14),%%" #reg "\n"
#define MEMOPMEM(opcode, reg, offset, base, index, scale) \
"lea " #offset "(%q" #base ",%q" #index "," #scale "),%%r14d\n" \
#opcode " %%" #reg ",(%%r15,%%r14)\n"
#define BUNDLEALIGN ".p2align 5 \n"
#else
#define MEMACCESS(base) "(%" #base ")"
#define MEMACCESS2(offset, base) #offset "(%" #base ")"
#define MEMLEA(offset, base) #offset "(%" #base ")"
#define MEMLEA3(offset, index, scale) \
#offset "(,%" #index "," #scale ")"
#define MEMLEA4(offset, base, index, scale) \
#offset "(%" #base ",%" #index "," #scale ")"
#define MEMOPREG(opcode, offset, base, index, scale, reg) \
#opcode " " #offset "(%" #base ",%" #index "," #scale "),%%" #reg "\n"
#define MEMOPMEM(opcode, reg, offset, base, index, scale) \
#opcode " %%" #reg ","#offset "(%" #base ",%" #index "," #scale ")\n"
#define BUNDLEALIGN
#endif
// GCC versions of row functions are verbatim conversions from Visual C.
// Generated using gcc disassembly on Visual C object file:
// objdump -D yuvscaler.obj >yuvscaler.txt
#define HAS_SCALEROWDOWN2_SSE2
static void ScaleRowDown2_SSE2(const uint8* src_ptr, ptrdiff_t src_stride,
uint8* dst_ptr, int dst_width) {
@ -1689,6 +1754,40 @@ static void ScaleFilterCols_SSSE3(uint8* dst_ptr, const uint8* src_ptr,
);
}
// Reads 4 pixels, duplicates them and writes 8 pixels.
// Alignment requirement: src_argb 16 byte aligned, dst_argb 16 byte aligned.
#define HAS_SCALECOLSUP2_SSE2
void ScaleColsUp2_SSE2(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int /* x */, int /* dx */) {
asm volatile (
".p2align 4 \n"
BUNDLEALIGN
"1: \n"
"movdqa " MEMACCESS(1) ",%%xmm0 \n"
"lea " MEMLEA(0x10,1) ",%1 \n"
"movdqa %%xmm0,%%xmm1 \n"
"punpcklbw %%xmm0,%%xmm0 \n"
"punpckhbw %%xmm1,%%xmm1 \n"
"sub $0x20,%2 \n"
"movdqa %%xmm0," MEMACCESS(0) " \n"
"movdqa %%xmm1," MEMACCESS2(0x10,0) " \n"
"lea " MEMLEA(0x20,0) ",%0 \n"
"jg 1b \n"
: "+r"(dst_ptr), // %0
"+r"(src_ptr), // %1
"+r"(dst_width) // %2
:
: "memory", "cc"
#if defined(__native_client__) && defined(__x86_64__)
, "r14"
#endif
#if defined(__SSE2__)
, "xmm0", "xmm1"
#endif
);
}
#endif // defined(__x86_64__) || defined(__i386__)
#if !defined(LIBYUV_DISABLE_MIPS) && !defined(__native_client__) && \
@ -1876,6 +1975,34 @@ static void ScaleRowDown34_1_Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
} while (d < dend);
}
// Scales a single row of pixels using point sampling.
void ScaleCols_C(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int x, int dx) {
for (int j = 0; j < dst_width - 1; j += 2) {
dst_ptr[0] = src_ptr[x >> 16];
x += dx;
dst_ptr[1] = src_ptr[x >> 16];
x += dx;
dst_ptr += 2;
}
if (dst_width & 1) {
dst_ptr[0] = src_ptr[x >> 16];
}
}
// Scales a single row of pixels up by 2x using point sampling.
void ScaleColsUp2_C(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int, int) {
for (int j = 0; j < dst_width - 1; j += 2) {
dst_ptr[1] = dst_ptr[0] = src_ptr[0];
src_ptr += 1;
dst_ptr += 2;
}
if (dst_width & 1) {
dst_ptr[0] = src_ptr[0];
}
}
// (1-f)a + fb can be replaced with a + f(b-a)
#define BLENDER(a, b, f) (static_cast<int>(a) + \
((f) * (static_cast<int>(b) - static_cast<int>(a)) >> 16))
@ -2484,7 +2611,7 @@ void ScalePlaneBilinearDown(int src_width, int src_height,
} else if (dst_height > 1) {
dy = FixedDiv(src_height - 1, dst_height - 1);
}
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
const int max_y = (src_height - 1) << 16;
for (int j = 0; j < dst_height; ++j) {
if (y > max_y) {
y = max_y;
@ -2515,6 +2642,29 @@ 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;
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);
}
void (*InterpolateRow)(uint8* dst_ptr, const uint8* src_ptr,
ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
InterpolateRow_C;
@ -2566,36 +2716,25 @@ void ScalePlaneBilinearUp(int src_width, int src_height,
#endif
void (*ScaleFilterCols)(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int x, int dx) = ScaleFilterCols_C;
int dst_width, int x, int dx) =
filtering ? ScaleFilterCols_C : ScaleCols_C;
#if defined(HAS_SCALEFILTERCOLS_SSSE3)
if (TestCpuFlag(kCpuHasSSSE3)) {
if (filtering && TestCpuFlag(kCpuHasSSSE3)) {
ScaleFilterCols = ScaleFilterCols_SSSE3;
}
#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);
if (!filtering && src_width * 2 == dst_width && x < 0x8000) {
ScaleFilterCols = ScaleColsUp2_C;
#if defined(HAS_SCALECOLS_SSE2)
if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(dst_width, 8) &&
IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(src_stride, 16) &&
IS_ALIGNED(dst_ptr, 16) && IS_ALIGNED(dst_stride, 16)) {
ScaleFilterCols = ScaleColsUp2_SSE2;
}
#endif
}
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
const int max_y = (src_height - 1) << 16;
if (y > max_y) {
y = max_y;
}
@ -2616,7 +2755,11 @@ void ScalePlaneBilinearUp(int src_width, int src_height,
for (int j = 0; j < dst_height; ++j) {
yi = y >> 16;
if (yi != lasty) {
if (y <= max_y) {
if (y > max_y) {
y = max_y;
yi = y >> 16;
}
if (yi != lasty) {
ScaleFilterCols(rowptr, src, dst_width, x, dx);
rowptr += rowstride;
rowstride = -rowstride;
@ -2635,7 +2778,7 @@ void ScalePlaneBilinearUp(int src_width, int src_height,
}
}
// Scale plane to/from any dimensions, without interpolation.
// Scale Plane to/from any dimensions, without interpolation.
// Fixed point math is used for performance: The upper 16 bits
// of x and dx is the integer part of the source position and
// the lower 16 bits are the fixed decimal part.
@ -2654,47 +2797,27 @@ static void ScalePlaneSimple(int src_width, int src_height,
dx = -dx;
src_width = -src_width;
}
for (int j = 0; j < dst_height; ++j) {
int xs = x;
int yi = y >> 16;
const uint8* src = src_ptr + yi * src_stride;
uint8* dst = dst_ptr;
for (int i = 0; i < dst_width; ++i) {
*dst++ = src[xs >> 16];
xs += dx;
void (*ScaleCols)(uint8* dst_ptr, const uint8* src_ptr,
int dst_width, int x, int dx) = ScaleCols_C;
if (src_width * 2 == dst_width && x < 0x8000) {
ScaleCols = ScaleColsUp2_C;
#if defined(HAS_SCALECOLS_SSE2)
if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(dst_width, 8) &&
IS_ALIGNED(src_ptr, 16) && IS_ALIGNED(src_stride, 16) &&
IS_ALIGNED(dst_ptr, 16) && IS_ALIGNED(dst_stride, 16)) {
ScaleCols = ScaleColsUp2_SSE2;
}
#endif
}
for (int i = 0; i < dst_height; ++i) {
ScaleCols(dst_ptr, src_ptr + (y >> 16) * src_stride,
dst_width, x, dx);
dst_ptr += dst_stride;
y += dy;
}
}
// Scale plane to/from any dimensions.
static void ScalePlaneAnySize(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,
FilterMode filtering) {
if (filtering == kFilterBox && src_width <= kMaxStride &&
dst_height * 2 < src_height ) {
ScalePlaneBox(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src_ptr, dst_ptr);
return;
}
if (filtering && dst_height > src_height && dst_width <= kMaxStride) {
ScalePlaneBilinearUp(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src_ptr, dst_ptr, filtering);
return;
}
if (filtering && src_width <= kMaxStride) {
ScalePlaneBilinearDown(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src_ptr, dst_ptr, filtering);
return;
}
ScalePlaneSimple(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src_ptr, dst_ptr);
}
// Scale a plane.
// This function in turn calls a scaling function suitable for handling
// the desired resolutions.
@ -2752,9 +2875,24 @@ void ScalePlane(const uint8* src, int src_stride,
return;
}
}
// Arbitrary scale up and/or down.
ScalePlaneAnySize(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src, dst, filtering);
if (filtering == kFilterBox && src_width <= kMaxStride &&
dst_height * 2 < src_height ) {
ScalePlaneBox(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src, dst);
return;
}
if (filtering && dst_height > src_height && dst_width <= kMaxStride) {
ScalePlaneBilinearUp(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src, dst, filtering);
return;
}
if (filtering && src_width <= kMaxStride) {
ScalePlaneBilinearDown(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src, dst, filtering);
return;
}
ScalePlaneSimple(src_width, src_height, dst_width, dst_height,
src_stride, dst_stride, src, dst);
}
// Scale an I420 image.

155
source/scale_argb.cc
View File

@ -401,6 +401,7 @@ static void ScaleARGBFilterCols_SSSE3(uint8* dst_argb, const uint8* src_argb,
// Reads 4 pixels, duplicates them and writes 8 pixels.
// Alignment requirement: src_argb 16 byte aligned, dst_argb 16 byte aligned.
#define HAS_SCALEARGBCOLSUP2_SSE2
__declspec(naked) __declspec(align(16))
void ScaleARGBColsUp2_SSE2(uint8* dst_argb, const uint8* src_argb,
int dst_width, int /* x */, int /* dx */) {
@ -735,6 +736,7 @@ void ScaleARGBCols_SSE2(uint8* dst_argb, const uint8* src_argb,
// Reads 4 pixels, duplicates them and writes 8 pixels.
// Alignment requirement: src_argb 16 byte aligned, dst_argb 16 byte aligned.
#define HAS_SCALEARGBCOLSUP2_SSE2
void ScaleARGBColsUp2_SSE2(uint8* dst_argb, const uint8* src_argb,
int dst_width, int /* x */, int /* dx */) {
asm volatile (
@ -945,6 +947,38 @@ static void ScaleARGBRowDownEvenBox_C(const uint8* src_argb,
}
}
// Scales a single row of pixels using point sampling.
void ScaleARGBCols_C(uint8* dst_argb, const uint8* src_argb,
int dst_width, int x, int dx) {
const uint32* src = reinterpret_cast<const uint32*>(src_argb);
uint32* dst = reinterpret_cast<uint32*>(dst_argb);
for (int j = 0; j < dst_width - 1; j += 2) {
dst[0] = src[x >> 16];
x += dx;
dst[1] = src[x >> 16];
x += dx;
dst += 2;
}
if (dst_width & 1) {
dst[0] = src[x >> 16];
}
}
// Scales a single row of pixels up by 2x using point sampling.
void ScaleARGBColsUp2_C(uint8* dst_argb, const uint8* src_argb,
int dst_width, int, int) {
const uint32* src = reinterpret_cast<const uint32*>(src_argb);
uint32* dst = reinterpret_cast<uint32*>(dst_argb);
for (int j = 0; j < dst_width - 1; j += 2) {
dst[1] = dst[0] = src[0];
src += 1;
dst += 2;
}
if (dst_width & 1) {
dst[0] = src[0];
}
}
// Mimics SSSE3 blender
#define BLENDER1(a, b, f) ((a) * (0x7f ^ f) + (b) * f) >> 7
#define BLENDERC(a, b, f, s) static_cast<uint32>( \
@ -1151,7 +1185,7 @@ static void ScaleARGBBilinearDown(int src_height,
ScaleARGBFilterCols = ScaleARGBFilterCols_SSSE3;
}
#endif
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
const int max_y = (src_height - 1) << 16;
for (int j = 0; j < dst_height; ++j) {
if (y > max_y) {
y = max_y;
@ -1231,13 +1265,30 @@ static void ScaleARGBBilinearUp(int src_width, int src_height,
}
#endif
void (*ScaleARGBFilterCols)(uint8* dst_argb, const uint8* src_argb,
int dst_width, int x, int dx) = ScaleARGBFilterCols_C;
int dst_width, int x, int dx) =
filtering ? ScaleARGBFilterCols_C : ScaleARGBCols_C;
#if defined(HAS_SCALEARGBFILTERCOLS_SSSE3)
if (TestCpuFlag(kCpuHasSSSE3)) {
if (filtering && TestCpuFlag(kCpuHasSSSE3)) {
ScaleARGBFilterCols = ScaleARGBFilterCols_SSSE3;
}
#endif
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
#if defined(HAS_SCALEARGBCOLS_SSE2)
if (!filtering && TestCpuFlag(kCpuHasSSE2)) {
ScaleARGBFilterCols = ScaleARGBCols_SSE2;
}
#endif
if (!filtering && src_width * 2 == dst_width && x < 0x8000) {
ScaleARGBFilterCols = ScaleARGBColsUp2_C;
#if defined(HAS_SCALEARGBCOLSUP2_SSE2)
if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(dst_width, 8) &&
IS_ALIGNED(src_argb, 16) && IS_ALIGNED(src_stride, 16) &&
IS_ALIGNED(dst_argb, 16) && IS_ALIGNED(dst_stride, 16)) {
ScaleARGBFilterCols = ScaleARGBColsUp2_SSE2;
}
#endif
}
const int max_y = (src_height - 1) << 16;
if (y > max_y) {
y = max_y;
}
@ -1258,7 +1309,11 @@ static void ScaleARGBBilinearUp(int src_width, int src_height,
for (int j = 0; j < dst_height; ++j) {
yi = y >> 16;
if (yi != lasty) {
if (y <= max_y) {
if (y > max_y) {
y = max_y;
yi = y >> 16;
}
if (yi != lasty) {
ScaleARGBFilterCols(rowptr, src, dst_width, x, dx);
rowptr += rowstride;
rowstride = -rowstride;
@ -1394,7 +1449,7 @@ static void ScaleYUVToARGBBilinearUp(int src_width, int src_height,
ScaleARGBFilterCols = ScaleARGBFilterCols_SSSE3;
}
#endif
const int max_y = (src_height > 1) ? ((src_height - 1) << 16) - 1 : 0;
const int max_y = (src_height - 1) << 16;
if (y > max_y) {
y = max_y;
}
@ -1430,7 +1485,11 @@ static void ScaleYUVToARGBBilinearUp(int src_width, int src_height,
for (int j = 0; j < dst_height; ++j) {
yi = y >> 16;
if (yi != lasty) {
if (y <= max_y) {
if (y > max_y) {
y = max_y;
yi = y >> 16;
}
if (yi != lasty) {
// TODO(fbarchard): Convert the clipped region of row.
I422ToARGBRow(src_row_y, src_row_u, src_row_v, argb_row, src_width);
ScaleARGBFilterCols(rowptr, argb_row, dst_width, x, dx);
@ -1456,26 +1515,7 @@ static void ScaleYUVToARGBBilinearUp(int src_width, int src_height,
}
#endif
// Scales a single row of pixels using point sampling.
// Code is adapted from libyuv bilinear yuv scaling, but with bilinear
// interpolation off, and argb pixels instead of yuv.
void ScaleARGBCols_C(uint8* dst_argb, const uint8* src_argb,
int dst_width, int x, int dx) {
const uint32* src = reinterpret_cast<const uint32*>(src_argb);
uint32* dst = reinterpret_cast<uint32*>(dst_argb);
for (int j = 0; j < dst_width - 1; j += 2) {
dst[0] = src[x >> 16];
x += dx;
dst[1] = src[x >> 16];
x += dx;
dst += 2;
}
if (dst_width & 1) {
dst[0] = src[x >> 16];
}
}
// ScaleARGB ARGB to/from any dimensions, without interpolation.
// Scale ARGB to/from any dimensions, without interpolation.
// Fixed point math is used for performance: The upper 16 bits
// of x and dx is the integer part of the source position and
// the lower 16 bits are the fixed decimal part.
@ -1490,14 +1530,18 @@ static void ScaleARGBSimple(int src_width, int src_height,
#if defined(HAS_SCALEARGBCOLS_SSE2)
if (TestCpuFlag(kCpuHasSSE2)) {
ScaleARGBCols = ScaleARGBCols_SSE2;
if (src_width * 2 == dst_width && IS_ALIGNED(dst_width, 8) &&
(x >> 16) == 0 &&
}
#endif
if (src_width * 2 == dst_width && x < 0x8000) {
ScaleARGBCols = ScaleARGBColsUp2_C;
#if defined(HAS_SCALEARGBCOLSUP2_SSE2)
if (TestCpuFlag(kCpuHasSSE2) && IS_ALIGNED(dst_width, 8) &&
IS_ALIGNED(src_argb, 16) && IS_ALIGNED(src_stride, 16) &&
IS_ALIGNED(dst_argb, 16) && IS_ALIGNED(dst_stride, 16)) {
ScaleARGBCols = ScaleARGBColsUp2_SSE2;
}
}
#endif
}
for (int i = 0; i < dst_height; ++i) {
ScaleARGBCols(dst_argb, src_argb + (y >> 16) * src_stride,
@ -1507,33 +1551,6 @@ static void ScaleARGBSimple(int src_width, int src_height,
}
}
// ScaleARGB ARGB to/from any dimensions.
static void ScaleARGBAnySize(int src_width, int src_height,
int dst_width, int dst_height,
int clip_width, int clip_height,
int src_stride, int dst_stride,
const uint8* src_argb, uint8* dst_argb,
int x, int dx, int y, int dy,
FilterMode filtering) {
if (filtering && dy < 65536 && dst_width * 4 <= kMaxStride) {
ScaleARGBBilinearUp(src_width, src_height,
clip_width, clip_height,
src_stride, dst_stride, src_argb, dst_argb,
x, dx, y, dy, filtering);
return;
}
if (filtering && src_width * 4 < kMaxStride) {
ScaleARGBBilinearDown(src_height,
clip_width, clip_height,
src_stride, dst_stride, src_argb, dst_argb,
x, dx, y, dy, filtering);
return;
}
ScaleARGBSimple(src_width, src_height, clip_width, clip_height,
src_stride, dst_stride, src_argb, dst_argb,
x, dx, y, dy);
}
// ScaleARGB a ARGB.
// This function in turn calls a scaling function
// suitable for handling the desired resolutions.
@ -1631,13 +1648,23 @@ static void ScaleARGB(const uint8* src, int src_stride,
x, y, dy, 4, filtering);
return;
}
// Arbitrary scale up and/or down.
ScaleARGBAnySize(src_width, src_height,
dst_width, dst_height,
clip_width, clip_height,
src_stride, dst_stride, src, dst,
x, dx, y, dy, filtering);
if (filtering && dy < 65536 && dst_width * 4 <= kMaxStride) {
ScaleARGBBilinearUp(src_width, src_height,
clip_width, clip_height,
src_stride, dst_stride, src, dst,
x, dx, y, dy, filtering);
return;
}
if (filtering && src_width * 4 < kMaxStride) {
ScaleARGBBilinearDown(src_height,
clip_width, clip_height,
src_stride, dst_stride, src, dst,
x, dx, y, dy, filtering);
return;
}
ScaleARGBSimple(src_width, src_height, clip_width, clip_height,
src_stride, dst_stride, src, dst,
x, dx, y, dy);
}
LIBYUV_API