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Move some branches outside looped code. Should improve the generated asm (and

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thus performance) slightly.

Patch by Sebastian Vater <cdgs.basty googlemail com>.

Originally committed as revision 22975 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Sebastian Vater 2010-04-26 22:38:41 +00:00 committed by Ronald S. Bultje
parent 473147bed0
commit fe51b5ce50
1 changed files with 38 additions and 7 deletions
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45
libavcodec/iff.c
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@ -140,16 +140,23 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
return -1;
}
if (avctx->pix_fmt == PIX_FMT_PAL8) {
for(y = 0; y < avctx->height; y++ ) {
uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
memset(row, 0, avctx->width);
for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
if (avctx->pix_fmt == PIX_FMT_PAL8) {
decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
} else { // PIX_FMT_BGR32
decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
buf += s->planesize;
}
}
} else { // PIX_FMT_BGR32
for(y = 0; y < avctx->height; y++ ) {
uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
memset(row, 0, avctx->width << 2);
for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), avctx->bits_per_coded_sample, plane);
buf += s->planesize;
}
}
}
@ -173,10 +180,11 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
return -1;
}
if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
if (avctx->pix_fmt == PIX_FMT_PAL8) {
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
memset(row, 0, avctx->pix_fmt == PIX_FMT_PAL8 ? avctx->width : (avctx->width * 4));
memset(row, 0, avctx->width);
for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
for(x = 0; x < s->planesize && buf < buf_end; ) {
int8_t value = *buf++;
@ -193,13 +201,36 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
}
x += length;
}
if (avctx->pix_fmt == PIX_FMT_PAL8) {
decodeplane8(row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
}
}
} else { //PIX_FMT_BGR32
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
memset(row, 0, avctx->width << 2);
for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
for(x = 0; x < s->planesize && buf < buf_end; ) {
int8_t value = *buf++;
unsigned length;
if (value >= 0) {
length = value + 1;
memcpy(s->planebuf + x, buf, FFMIN3(length, s->planesize - x, buf_end - buf));
buf += length;
} else if (value > -128) {
length = -value + 1;
memset(s->planebuf + x, *buf++, FFMIN(length, s->planesize - x));
} else { // noop
continue;
}
x += length;
}
decodeplane32((uint32_t *) row, s->planebuf, s->planesize, avctx->bits_per_coded_sample, plane);
}
}
}
} else {
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
for(x = 0; x < avctx->width && buf < buf_end; ) {
int8_t value = *buf++;
unsigned length;