ref: 7129ee8d8bbc839a7adb11f8d40599b90aa9705b
dir: /vp8/common/extend.c/
/*
* Copyright (c) 2010 The WebM 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 "extend.h"
#include "vpx_mem/vpx_mem.h"
static void copy_and_extend_plane(
unsigned char *s, /* source */
int sp, /* source pitch */
unsigned char *d, /* destination */
int dp, /* destination pitch */
int h, /* height */
int w, /* width */
int et, /* extend top border */
int el, /* extend left border */
int eb, /* extend bottom border */
int er, /* extend right border */
int interleave_step) { /* step between pixels of the current plane */
int i, j;
unsigned char *src_ptr1, *src_ptr2;
unsigned char *dest_ptr1, *dest_ptr2;
int linesize;
if (interleave_step < 1) interleave_step = 1;
/* copy the left and right most columns out */
src_ptr1 = s;
src_ptr2 = s + (w - 1) * interleave_step;
dest_ptr1 = d - el;
dest_ptr2 = d + w;
for (i = 0; i < h; ++i) {
memset(dest_ptr1, src_ptr1[0], el);
if (interleave_step == 1) {
memcpy(dest_ptr1 + el, src_ptr1, w);
} else {
for (j = 0; j < w; j++) {
dest_ptr1[el + j] = src_ptr1[interleave_step * j];
}
}
memset(dest_ptr2, src_ptr2[0], er);
src_ptr1 += sp;
src_ptr2 += sp;
dest_ptr1 += dp;
dest_ptr2 += dp;
}
/* Now copy the top and bottom lines into each line of the respective
* borders
*/
src_ptr1 = d - el;
src_ptr2 = d + dp * (h - 1) - el;
dest_ptr1 = d + dp * (-et) - el;
dest_ptr2 = d + dp * (h)-el;
linesize = el + er + w;
for (i = 0; i < et; ++i) {
memcpy(dest_ptr1, src_ptr1, linesize);
dest_ptr1 += dp;
}
for (i = 0; i < eb; ++i) {
memcpy(dest_ptr2, src_ptr2, linesize);
dest_ptr2 += dp;
}
}
void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
YV12_BUFFER_CONFIG *dst) {
int et = dst->border;
int el = dst->border;
int eb = dst->border + dst->y_height - src->y_height;
int er = dst->border + dst->y_width - src->y_width;
// detect nv12 colorspace
int chroma_step = src->v_buffer - src->u_buffer == 1 ? 2 : 1;
copy_and_extend_plane(src->y_buffer, src->y_stride, dst->y_buffer,
dst->y_stride, src->y_height, src->y_width, et, el, eb,
er, 1);
et = dst->border >> 1;
el = dst->border >> 1;
eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
er = (dst->border >> 1) + dst->uv_width - src->uv_width;
copy_and_extend_plane(src->u_buffer, src->uv_stride, dst->u_buffer,
dst->uv_stride, src->uv_height, src->uv_width, et, el,
eb, er, chroma_step);
copy_and_extend_plane(src->v_buffer, src->uv_stride, dst->v_buffer,
dst->uv_stride, src->uv_height, src->uv_width, et, el,
eb, er, chroma_step);
}
void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
YV12_BUFFER_CONFIG *dst, int srcy,
int srcx, int srch, int srcw) {
int et = dst->border;
int el = dst->border;
int eb = dst->border + dst->y_height - src->y_height;
int er = dst->border + dst->y_width - src->y_width;
int src_y_offset = srcy * src->y_stride + srcx;
int dst_y_offset = srcy * dst->y_stride + srcx;
int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
// detect nv12 colorspace
int chroma_step = src->v_buffer - src->u_buffer == 1 ? 2 : 1;
/* If the side is not touching the bounder then don't extend. */
if (srcy) et = 0;
if (srcx) el = 0;
if (srcy + srch != src->y_height) eb = 0;
if (srcx + srcw != src->y_width) er = 0;
copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,
dst->y_buffer + dst_y_offset, dst->y_stride, srch, srcw,
et, el, eb, er, 1);
et = (et + 1) >> 1;
el = (el + 1) >> 1;
eb = (eb + 1) >> 1;
er = (er + 1) >> 1;
srch = (srch + 1) >> 1;
srcw = (srcw + 1) >> 1;
copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,
dst->u_buffer + dst_uv_offset, dst->uv_stride, srch,
srcw, et, el, eb, er, chroma_step);
copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
dst->v_buffer + dst_uv_offset, dst->uv_stride, srch,
srcw, et, el, eb, er, chroma_step);
}
/* note the extension is only for the last row, for intra prediction purpose */
void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr,
unsigned char *UPtr, unsigned char *VPtr) {
int i;
YPtr += ybf->y_stride * 14;
UPtr += ybf->uv_stride * 6;
VPtr += ybf->uv_stride * 6;
for (i = 0; i < 4; ++i) {
YPtr[i] = YPtr[-1];
UPtr[i] = UPtr[-1];
VPtr[i] = VPtr[-1];
}
YPtr += ybf->y_stride;
UPtr += ybf->uv_stride;
VPtr += ybf->uv_stride;
for (i = 0; i < 4; ++i) {
YPtr[i] = YPtr[-1];
UPtr[i] = UPtr[-1];
VPtr[i] = VPtr[-1];
}
}