ref: c211b82d08231a959aee8354e76db179e7dd2139
dir: /third_party/libyuv/source/rotate_argb.cc/
/*
* Copyright 2012 The LibYuv Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "libyuv/rotate.h"
#include "libyuv/convert.h"
#include "libyuv/cpu_id.h"
#include "libyuv/planar_functions.h"
#include "libyuv/row.h"
#include "libyuv/scale_row.h" /* for ScaleARGBRowDownEven_ */
#ifdef __cplusplus
namespace libyuv {
extern "C" {
#endif
static void ARGBTranspose(const uint8_t* src_argb,
int src_stride_argb,
uint8_t* dst_argb,
int dst_stride_argb,
int width,
int height) {
int i;
int src_pixel_step = src_stride_argb >> 2;
void (*ScaleARGBRowDownEven)(
const uint8_t* src_argb, ptrdiff_t src_stride_argb, int src_step,
uint8_t* dst_argb, int dst_width) = ScaleARGBRowDownEven_C;
#if defined(HAS_SCALEARGBROWDOWNEVEN_SSE2)
if (TestCpuFlag(kCpuHasSSE2)) {
ScaleARGBRowDownEven = ScaleARGBRowDownEven_Any_SSE2;
if (IS_ALIGNED(height, 4)) { // Width of dest.
ScaleARGBRowDownEven = ScaleARGBRowDownEven_SSE2;
}
}
#endif
#if defined(HAS_SCALEARGBROWDOWNEVEN_NEON)
if (TestCpuFlag(kCpuHasNEON)) {
ScaleARGBRowDownEven = ScaleARGBRowDownEven_Any_NEON;
if (IS_ALIGNED(height, 4)) { // Width of dest.
ScaleARGBRowDownEven = ScaleARGBRowDownEven_NEON;
}
}
#endif
#if defined(HAS_SCALEARGBROWDOWNEVEN_MSA)
if (TestCpuFlag(kCpuHasMSA)) {
ScaleARGBRowDownEven = ScaleARGBRowDownEven_Any_MSA;
if (IS_ALIGNED(height, 4)) { // Width of dest.
ScaleARGBRowDownEven = ScaleARGBRowDownEven_MSA;
}
}
#endif
for (i = 0; i < width; ++i) { // column of source to row of dest.
ScaleARGBRowDownEven(src_argb, 0, src_pixel_step, dst_argb, height);
dst_argb += dst_stride_argb;
src_argb += 4;
}
}
void ARGBRotate90(const uint8_t* src_argb,
int src_stride_argb,
uint8_t* dst_argb,
int dst_stride_argb,
int width,
int height) {
// Rotate by 90 is a ARGBTranspose with the source read
// from bottom to top. So set the source pointer to the end
// of the buffer and flip the sign of the source stride.
src_argb += src_stride_argb * (height - 1);
src_stride_argb = -src_stride_argb;
ARGBTranspose(src_argb, src_stride_argb, dst_argb, dst_stride_argb, width,
height);
}
void ARGBRotate270(const uint8_t* src_argb,
int src_stride_argb,
uint8_t* dst_argb,
int dst_stride_argb,
int width,
int height) {
// Rotate by 270 is a ARGBTranspose with the destination written
// from bottom to top. So set the destination pointer to the end
// of the buffer and flip the sign of the destination stride.
dst_argb += dst_stride_argb * (width - 1);
dst_stride_argb = -dst_stride_argb;
ARGBTranspose(src_argb, src_stride_argb, dst_argb, dst_stride_argb, width,
height);
}
void ARGBRotate180(const uint8_t* src_argb,
int src_stride_argb,
uint8_t* dst_argb,
int dst_stride_argb,
int width,
int height) {
// Swap first and last row and mirror the content. Uses a temporary row.
align_buffer_64(row, width * 4);
const uint8_t* src_bot = src_argb + src_stride_argb * (height - 1);
uint8_t* dst_bot = dst_argb + dst_stride_argb * (height - 1);
int half_height = (height + 1) >> 1;
int y;
void (*ARGBMirrorRow)(const uint8_t* src_argb, uint8_t* dst_argb, int width) =
ARGBMirrorRow_C;
void (*CopyRow)(const uint8_t* src_argb, uint8_t* dst_argb, int width) =
CopyRow_C;
#if defined(HAS_ARGBMIRRORROW_NEON)
if (TestCpuFlag(kCpuHasNEON)) {
ARGBMirrorRow = ARGBMirrorRow_Any_NEON;
if (IS_ALIGNED(width, 4)) {
ARGBMirrorRow = ARGBMirrorRow_NEON;
}
}
#endif
#if defined(HAS_ARGBMIRRORROW_SSE2)
if (TestCpuFlag(kCpuHasSSE2)) {
ARGBMirrorRow = ARGBMirrorRow_Any_SSE2;
if (IS_ALIGNED(width, 4)) {
ARGBMirrorRow = ARGBMirrorRow_SSE2;
}
}
#endif
#if defined(HAS_ARGBMIRRORROW_AVX2)
if (TestCpuFlag(kCpuHasAVX2)) {
ARGBMirrorRow = ARGBMirrorRow_Any_AVX2;
if (IS_ALIGNED(width, 8)) {
ARGBMirrorRow = ARGBMirrorRow_AVX2;
}
}
#endif
#if defined(HAS_ARGBMIRRORROW_MSA)
if (TestCpuFlag(kCpuHasMSA)) {
ARGBMirrorRow = ARGBMirrorRow_Any_MSA;
if (IS_ALIGNED(width, 16)) {
ARGBMirrorRow = ARGBMirrorRow_MSA;
}
}
#endif
#if defined(HAS_COPYROW_SSE2)
if (TestCpuFlag(kCpuHasSSE2)) {
CopyRow = IS_ALIGNED(width * 4, 32) ? CopyRow_SSE2 : CopyRow_Any_SSE2;
}
#endif
#if defined(HAS_COPYROW_AVX)
if (TestCpuFlag(kCpuHasAVX)) {
CopyRow = IS_ALIGNED(width * 4, 64) ? CopyRow_AVX : CopyRow_Any_AVX;
}
#endif
#if defined(HAS_COPYROW_ERMS)
if (TestCpuFlag(kCpuHasERMS)) {
CopyRow = CopyRow_ERMS;
}
#endif
#if defined(HAS_COPYROW_NEON)
if (TestCpuFlag(kCpuHasNEON)) {
CopyRow = IS_ALIGNED(width * 4, 32) ? CopyRow_NEON : CopyRow_Any_NEON;
}
#endif
// Odd height will harmlessly mirror the middle row twice.
for (y = 0; y < half_height; ++y) {
ARGBMirrorRow(src_argb, row, width); // Mirror first row into a buffer
ARGBMirrorRow(src_bot, dst_argb, width); // Mirror last row into first row
CopyRow(row, dst_bot, width * 4); // Copy first mirrored row into last
src_argb += src_stride_argb;
dst_argb += dst_stride_argb;
src_bot -= src_stride_argb;
dst_bot -= dst_stride_argb;
}
free_aligned_buffer_64(row);
}
LIBYUV_API
int ARGBRotate(const uint8_t* src_argb,
int src_stride_argb,
uint8_t* dst_argb,
int dst_stride_argb,
int width,
int height,
enum RotationMode mode) {
if (!src_argb || width <= 0 || height == 0 || !dst_argb) {
return -1;
}
// Negative height means invert the image.
if (height < 0) {
height = -height;
src_argb = src_argb + (height - 1) * src_stride_argb;
src_stride_argb = -src_stride_argb;
}
switch (mode) {
case kRotate0:
// copy frame
return ARGBCopy(src_argb, src_stride_argb, dst_argb, dst_stride_argb,
width, height);
case kRotate90:
ARGBRotate90(src_argb, src_stride_argb, dst_argb, dst_stride_argb, width,
height);
return 0;
case kRotate270:
ARGBRotate270(src_argb, src_stride_argb, dst_argb, dst_stride_argb, width,
height);
return 0;
case kRotate180:
ARGBRotate180(src_argb, src_stride_argb, dst_argb, dst_stride_argb, width,
height);
return 0;
default:
break;
}
return -1;
}
#ifdef __cplusplus
} // extern "C"
} // namespace libyuv
#endif