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/*
* 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 i;
unsigned char *src_ptr1, *src_ptr2;
unsigned char *dest_ptr1, *dest_ptr2;
int linesize;
/* copy the left and right most columns out */
src_ptr1 = s;
src_ptr2 = s + w - 1;
dest_ptr1 = d - el;
dest_ptr2 = d + w;
for (i = 0; i < h; i++)
{
memset(dest_ptr1, src_ptr1[0], el);
memcpy(dest_ptr1 + el, src_ptr1, w);
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;
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);
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);
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);
}
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);
/* 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);
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);
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);
}
/* 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];
}
}
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