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https://chromium.googlesource.com/libyuv/libyuv
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ed6edcab8b
90, 180, 270 rotate of array with a minimum size of 8x8. Also deinterleave on rotate for NV12/NV21 formats. Review URL: http://webrtc-codereview.appspot.com/195002 git-svn-id: http://libyuv.googlecode.com/svn/trunk@23 16f28f9a-4ce2-e073-06de-1de4eb20be90
122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
/*
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* Copyright (c) 2011 The LibYuv project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rotate.h"
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namespace libyuv {
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typedef void (*reverse_func)(const uint8*, uint8*, int);
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typedef void (*rotate_wx8func)(const uint8*, int, uint8*, int, int);
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typedef void (*rotate_wxhfunc)(const uint8*, int, uint8*, int, int, int);
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#ifdef __ARM_NEON__
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extern "C" {
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void ReverseLine_NEON(const uint8* src, uint8* dst, int width);
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void Transpose_wx8_NEON(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch, int width);
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} // extern "C"
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#endif
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static void Transpose_wx8_C(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch,
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int w) {
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int i, j;
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for (i = 0; i < w; ++i)
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for (j = 0; j < 8; ++j)
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dst[i * dst_pitch + j] = src[j * src_pitch + i];
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}
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static void Transpose_wxh_C(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch,
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int width, int height) {
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int i, j;
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for (i = 0; i < width; ++i)
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for (j = 0; j < height; ++j)
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dst[i * dst_pitch + j] = src[j * src_pitch + i];
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}
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void Transpose(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch,
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int width, int height) {
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int i = height;
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rotate_wx8func Transpose_wx8;
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rotate_wxhfunc Transpose_wxh;
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// do processor detection here.
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#ifdef __ARM_NEON__
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Transpose_wx8 = Transpose_wx8_NEON;
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Transpose_wxh = Transpose_wxh_C;
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#else
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Transpose_wx8 = Transpose_wx8_C;
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Transpose_wxh = Transpose_wxh_C;
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#endif
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// work across the source in 8x8 tiles
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do {
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Transpose_wx8(src, src_pitch, dst, dst_pitch, width);
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src += 8 * src_pitch;
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dst += 8;
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i -= 8;
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} while (i >= 8);
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// TODO(frkoenig): Have wx4 and maybe wx2
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Transpose_wxh(src, src_pitch, dst, dst_pitch, width, i);
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}
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void Rotate90(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch,
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int width, int height) {
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src += src_pitch*(height-1);
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src_pitch = -src_pitch;
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Transpose(src, src_pitch, dst, dst_pitch, width, height);
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}
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void Rotate270(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch,
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int width, int height) {
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dst += dst_pitch*(width-1);
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dst_pitch = -dst_pitch;
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Transpose(src, src_pitch, dst, dst_pitch, width, height);
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}
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void ReverseLine_C(const uint8* src, uint8* dst, int width) {
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int i;
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for (i = 0; i < width; ++i)
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dst[width-1 - i] = src[i];
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}
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void Rotate180(const uint8* src, int src_pitch,
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uint8* dst, int dst_pitch,
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int width, int height) {
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int i;
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reverse_func ReverseLine;
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// do processor detection here.
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#ifdef __ARM_NEON__
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ReverseLine = ReverseLine_NEON;
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#else
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ReverseLine = ReverseLine_C;
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#endif
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dst += dst_pitch*(height-1);
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for (i = 0; i < height; ++i) {
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ReverseLine(src, dst, width);
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src += src_pitch;
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dst -= dst_pitch;
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}
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}
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} // namespace libyuv
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