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fraps: optimize pseudo-YUV to RGB conversion.

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With gcc 4.6 this part of the code is ca. 4x faster, resulting
in an overall speedup of around 5% for fate-fraps-v5 sample.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2012-01-29 15:40:48 +01:00
parent 7df9937fcc
commit 7fabef1f01
1 changed files with 8 additions and 3 deletions
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11
libavcodec/fraps.c
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@ -140,6 +140,7 @@ static int decode_frame(AVCodecContext *avctx,
uint32_t offs[4];
int i, j, is_chroma;
const int planes = 3;
uint8_t *out;
header = AV_RL32(buf);
@ -281,12 +282,16 @@ static int decode_frame(AVCodecContext *avctx,
return -1;
}
}
out = f->data[0];
// convert pseudo-YUV into real RGB
for(j = 0; j < avctx->height; j++){
for(i = 0; i < avctx->width; i++){
f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
uint8_t *line_end = out + 3*avctx->width;
while (out < line_end) {
out[0] += out[1];
out[2] += out[1];
out += 3;
}
out += f->linesize[0] - 3*avctx->width;
}
break;
}