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Rearrange how the different cases are checked to reduce the number of 

comparisons and allow further simplifications.

Originally committed as revision 18268 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-03-31 14:04:54 +00:00
parent 168fffdf01
commit 268a618ba6
1 changed files with 8 additions and 5 deletions
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11
libavcodec/interplayvideo.c
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@ -386,7 +386,8 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
memcpy(P, s->stream_ptr, 4);
s->stream_ptr += 4;
if ((P[0] <= P[1]) && (P[2] <= P[3])) {
if (P[0] <= P[1]) {
if (P[2] <= P[3]) {
/* 1 of 4 colors for each pixel, need 16 more bytes */
CHECK_STREAM_PTR(16);
@ -400,7 +401,7 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
s->pixel_ptr += s->line_inc;
}
} else if ((P[0] <= P[1]) && (P[2] > P[3])) {
} else {
uint32_t flags;
/* 1 of 4 colors for each 2x2 block, need 4 more bytes */
@ -418,7 +419,9 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
s->pixel_ptr += s->stride * 2;
}
} else if ((P[0] > P[1]) && (P[2] <= P[3])) {
}
} else {
if (P[2] <= P[3]) {
uint64_t flags;
/* 1 of 4 colors for each 2x1 block, need 8 more bytes */
@ -432,7 +435,6 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
}
s->pixel_ptr += s->stride;
}
} else {
uint64_t flags;
@ -448,6 +450,7 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
s->pixel_ptr += s->stride * 2;
}
}
}
/* report success */
return 0;