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