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Code Issues Releases Activity

avcodec/scpr: Avoid per pixel y checks in decode_run_i

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about 1% faster

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-12-27 10:36:38 +01:00
parent 20564d23fd
commit c4276a7f30
1 changed files with 22 additions and 17 deletions
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39
libavcodec/scpr.h
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@ -89,12 +89,12 @@ static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
uint32_t lx = *plx,
ly = *ply;
if (y >= avctx->height)
return AVERROR_INVALIDDATA;
switch (ptype) {
case 0:
while (run-- > 0) {
if (y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[y * linesize + x] = clr;
lx = x;
ly = y;
@ -102,14 +102,13 @@ static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
if (x >= avctx->width) {
x = 0;
(y)++;
if (y >= avctx->height && run)
return AVERROR_INVALIDDATA;
}
}
break;
case 1:
while (run-- > 0) {
if (y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[y * linesize + x] = dst[ly * linesize + lx];
lx = x;
ly = y;
@ -117,15 +116,17 @@ static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
if (x >= avctx->width) {
x = 0;
(y)++;
if (y >= avctx->height && run)
return AVERROR_INVALIDDATA;
}
}
clr = dst[ly * linesize + lx];
break;
case 2:
while (run-- > 0) {
if (y < 1 || y >= avctx->height)
return AVERROR_INVALIDDATA;
if (y < 1)
return AVERROR_INVALIDDATA;
while (run-- > 0) {
clr = dst[y * linesize + x + off + 1];
dst[y * linesize + x] = clr;
lx = x;
@ -134,19 +135,20 @@ static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
if (x >= avctx->width) {
x = 0;
(y)++;
if (y >= avctx->height && run)
return AVERROR_INVALIDDATA;
}
}
break;
case 4:
if (y < 1 || (y == 1 && x == 0))
return AVERROR_INVALIDDATA;
while (run-- > 0) {
uint8_t *odst = (uint8_t *)dst;
int off1 = (ly * linesize + lx) * 4;
int off2 = ((y * linesize + x) + off) * 4;
if (y < 1 || y >= avctx->height ||
(y == 1 && x == 0))
return AVERROR_INVALIDDATA;
if (x == 0) {
z = backstep * 4;
} else {
@ -170,15 +172,16 @@ static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
if (x >= avctx->width) {
x = 0;
(y)++;
if (y >= avctx->height && run)
return AVERROR_INVALIDDATA;
}
}
break;
case 5:
while (run-- > 0) {
if (y < 1 || y >= avctx->height ||
(y == 1 && x == 0))
return AVERROR_INVALIDDATA;
if (y < 1 || (y == 1 && x == 0))
return AVERROR_INVALIDDATA;
while (run-- > 0) {
if (x == 0) {
z = backstep;
} else {
@ -193,6 +196,8 @@ static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
if (x >= avctx->width) {
x = 0;
(y)++;
if (y >= avctx->height && run)
return AVERROR_INVALIDDATA;
}
}
break;