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/*
* Copyright (c) 2002-2012 Michael Niedermayer
* Copyright (C) 2012 Ronald S. Bultje
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "bit_depth_template.c"
void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
ptrdiff_t buf_linesize,
ptrdiff_t src_linesize,
int block_w, int block_h,
int src_x, int src_y, int w, int h)
{
int x, y;
int start_y, start_x, end_y, end_x;
if (!w || !h)
return;
av_assert2(block_w * sizeof(pixel) <= FFABS(buf_linesize));
if (src_y >= h) {
src -= src_y * src_linesize;
src += (h - 1) * src_linesize;
src_y = h - 1;
} else if (src_y <= -block_h) {
src -= src_y * src_linesize;
src += (1 - block_h) * src_linesize;
src_y = 1 - block_h;
}
if (src_x >= w) {
// The subtracted expression has an unsigned type and must thus not be negative
src -= (1 + src_x - w) * sizeof(pixel);
src_x = w - 1;
} else if (src_x <= -block_w) {
src += (1 - block_w - src_x) * sizeof(pixel);
src_x = 1 - block_w;
}
start_y = FFMAX(0, -src_y);
start_x = FFMAX(0, -src_x);
end_y = FFMIN(block_h, h-src_y);
end_x = FFMIN(block_w, w-src_x);
av_assert2(start_y < end_y && block_h);
av_assert2(start_x < end_x && block_w);
w = end_x - start_x;
src += start_y * src_linesize + start_x * sizeof(pixel);
buf += start_x * sizeof(pixel);
// top
for (y = 0; y < start_y; y++) {
memcpy(buf, src, w * sizeof(pixel));
buf += buf_linesize;
}
// copy existing part
for (; y < end_y; y++) {
memcpy(buf, src, w * sizeof(pixel));
src += src_linesize;
buf += buf_linesize;
}
// bottom
src -= src_linesize;
for (; y < block_h; y++) {
memcpy(buf, src, w * sizeof(pixel));
buf += buf_linesize;
}
buf -= block_h * buf_linesize + start_x * sizeof(pixel);
while (block_h--) {
pixel *bufp = (pixel *) buf;
// left
for(x = 0; x < start_x; x++) {
bufp[x] = bufp[start_x];
}
// right
for (x = end_x; x < block_w; x++) {
bufp[x] = bufp[end_x - 1];
}
buf += buf_linesize;
}
}
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