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Take shortcuts for mv0 case in VP8 MC

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Avoid edge emulation -- it isn't needed if there isn't any subpel.

Originally committed as revision 24413 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser 2010-07-22 05:49:09 +00:00
parent 702e8d3376
commit c0498b3031
1 changed files with 18 additions and 16 deletions
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34
libavcodec/vp8.c
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@ -1008,24 +1008,26 @@ static inline void vp8_mc(VP8Context *s, int luma,
int width, int height, int linesize,
vp8_mc_func mc_func[3][3])
{
static const uint8_t idx[8] = { 0, 1, 2, 1, 2, 1, 2, 1 };
int mx = (mv->x << luma)&7, mx_idx = idx[mx];
int my = (mv->y << luma)&7, my_idx = idx[my];
if (AV_RN32A(mv)) {
static const uint8_t idx[8] = { 0, 1, 2, 1, 2, 1, 2, 1 };
int mx = (mv->x << luma)&7, mx_idx = idx[mx];
int my = (mv->y << luma)&7, my_idx = idx[my];
x_off += mv->x >> (3 - luma);
y_off += mv->y >> (3 - luma);
x_off += mv->x >> (3 - luma);
y_off += mv->y >> (3 - luma);
// edge emulation
src += y_off * linesize + x_off;
if (x_off < 2 || x_off >= width - block_w - 3 ||
y_off < 2 || y_off >= height - block_h - 3) {
ff_emulated_edge_mc(s->edge_emu_buffer, src - 2 * linesize - 2, linesize,
block_w + 5, block_h + 5,
x_off - 2, y_off - 2, width, height);
src = s->edge_emu_buffer + 2 + linesize * 2;
}
mc_func[my_idx][mx_idx](dst, linesize, src, linesize, block_h, mx, my);
// edge emulation
src += y_off * linesize + x_off;
if (x_off < 2 || x_off >= width - block_w - 3 ||
y_off < 2 || y_off >= height - block_h - 3) {
ff_emulated_edge_mc(s->edge_emu_buffer, src - 2 * linesize - 2, linesize,
block_w + 5, block_h + 5,
x_off - 2, y_off - 2, width, height);
src = s->edge_emu_buffer + 2 + linesize * 2;
}
mc_func[my_idx][mx_idx](dst, linesize, src, linesize, block_h, mx, my);
} else
mc_func[0][0](dst, linesize, src + y_off * linesize + x_off, linesize, block_h, 0, 0);
}
static inline void vp8_mc_part(VP8Context *s, uint8_t *dst[3],