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author | Ronald S. Bultje <rsbultje@gmail.com> | 2011-01-27 06:37:50 +0300 |
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committer | Ronald S. Bultje <rsbultje@gmail.com> | 2011-01-29 06:13:26 +0300 |
commit | e5262ec44a30a9132f0361f775c5b63d20e4e4d5 (patch) | |
tree | 20c667285e01385a4c73b8df6144934211112fb1 /libavcodec/dsputil.c | |
parent | 4d54df8e07dca3e30ebcaffd1a0e750a876700a2 (diff) |
Optimize C version of ff_emulated_edge_mc().
From ~780 cycles to 551 cycles, mostly just by using libc memcpy()
instead of manually shuffling individual bytes around.
Diffstat (limited to 'libavcodec/dsputil.c')
-rw-r--r-- | libavcodec/dsputil.c | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c index 84f91fc135..fafe5f52d7 100644 --- a/libavcodec/dsputil.c +++ b/libavcodec/dsputil.c @@ -355,38 +355,45 @@ void ff_emulated_edge_mc(uint8_t *buf, const uint8_t *src, int linesize, int blo start_x= FFMAX(0, -src_x); end_y= FFMIN(block_h, h-src_y); end_x= FFMIN(block_w, w-src_x); + assert(start_y < end_y && block_h); + assert(start_x < end_x && block_w); - // copy existing part - for(y=start_y; y<end_y; y++){ - for(x=start_x; x<end_x; x++){ - buf[x + y*linesize]= src[x + y*linesize]; - } - } + w = end_x - start_x; + src += start_y*linesize + start_x; + buf += start_x; //top for(y=0; y<start_y; y++){ - for(x=start_x; x<end_x; x++){ - buf[x + y*linesize]= buf[x + start_y*linesize]; - } + memcpy(buf, src, w); + buf += linesize; + } + + // copy existing part + for(; y<end_y; y++){ + memcpy(buf, src, w); + src += linesize; + buf += linesize; } //bottom - for(y=end_y; y<block_h; y++){ - for(x=start_x; x<end_x; x++){ - buf[x + y*linesize]= buf[x + (end_y-1)*linesize]; - } + src -= linesize; + for(; y<block_h; y++){ + memcpy(buf, src, w); + buf += linesize; } - for(y=0; y<block_h; y++){ + buf -= block_h * linesize + start_x; + while (block_h--){ //left for(x=0; x<start_x; x++){ - buf[x + y*linesize]= buf[start_x + y*linesize]; + buf[x] = buf[start_x]; } //right for(x=end_x; x<block_w; x++){ - buf[x + y*linesize]= buf[end_x - 1 + y*linesize]; + buf[x] = buf[end_x - 1]; } + buf += linesize; } } |