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Optimize 640 mode raw decoding for case where consecutive blocks of 4 pixels are the same.

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This is also a win provided it can use the optimized case over ~40% of the time.
This commit is contained in:
Stephen Heumann 2015-09-28 22:33:02 -05:00
parent 2f13669a2f
commit c6389c9925
1 changed files with 32 additions and 18 deletions
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50
raw.cc
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@ -103,35 +103,50 @@ void RawDraw (void) {
lineDataPtr = dataPtr + (unsigned long) drawingLine * rectWidth;
do { /* We short-circuit back to here if there are no events pending */
unsigned inPixelsA, inPixelsB, inPixelsA2, inPixelsB2, outPixels;
finalDestPtr = destPtr + lineBytes - 1;
if (hRez == 640) {
initialLineDataPtr = lineDataPtr;
while (destPtr + 7 < finalDestPtr) { /* Unrolled loop */
*(unsigned*)destPtr =
*(unsigned*)(bigcoltab640a + *(unsigned*)lineDataPtr)
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[1]);
outPixels = (*(unsigned*)(bigcoltab640a + (inPixelsA = *(unsigned*)lineDataPtr))
^ *(unsigned*)(bigcoltab640b + (inPixelsB = ((unsigned*)lineDataPtr)[1])));
*(unsigned*)(destPtr+1) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[2])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[3]);
((inPixelsA ^ (inPixelsA2 = ((unsigned*)lineDataPtr)[2])) |
(inPixelsB ^ (inPixelsB2 = ((unsigned*)lineDataPtr)[3]))) == 0 ? outPixels :
(outPixels = (*(unsigned*)(bigcoltab640a + inPixelsA2)
^ *(unsigned*)(bigcoltab640b + inPixelsB2)));
*(unsigned*)(destPtr+2) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[4])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[5]);
((inPixelsA2 ^ (inPixelsA = ((unsigned*)lineDataPtr)[4])) |
(inPixelsB2 ^ (inPixelsB = ((unsigned*)lineDataPtr)[5]))) == 0 ? outPixels :
(outPixels = (*(unsigned*)(bigcoltab640a + inPixelsA)
^ *(unsigned*)(bigcoltab640b + inPixelsB)));
*(unsigned*)(destPtr+3) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[6])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[7]);
((inPixelsA ^ (inPixelsA2 = ((unsigned*)lineDataPtr)[6])) |
(inPixelsB ^ (inPixelsB2 = ((unsigned*)lineDataPtr)[7]))) == 0 ? outPixels :
(outPixels = (*(unsigned*)(bigcoltab640a + inPixelsA2)
^ *(unsigned*)(bigcoltab640b + inPixelsB2)));
*(unsigned*)(destPtr+4) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[8])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[9]);
((inPixelsA2 ^ (inPixelsA = ((unsigned*)lineDataPtr)[8])) |
(inPixelsB2 ^ (inPixelsB = ((unsigned*)lineDataPtr)[9]))) == 0 ? outPixels :
(outPixels = (*(unsigned*)(bigcoltab640a + inPixelsA)
^ *(unsigned*)(bigcoltab640b + inPixelsB)));
*(unsigned*)(destPtr+5) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[10])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[11]);
((inPixelsA ^ (inPixelsA2 = ((unsigned*)lineDataPtr)[10])) |
(inPixelsB ^ (inPixelsB2 = ((unsigned*)lineDataPtr)[11]))) == 0 ? outPixels :
(outPixels = (*(unsigned*)(bigcoltab640a + inPixelsA2)
^ *(unsigned*)(bigcoltab640b + inPixelsB2)));
*(unsigned*)(destPtr+6) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[12])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[13]);
* (destPtr+7) =
*(unsigned*)(bigcoltab640a + ((unsigned*)lineDataPtr)[14])
+ *(unsigned*)(bigcoltab640b + ((unsigned*)lineDataPtr)[15]);
((inPixelsA2 ^ (inPixelsA = ((unsigned*)lineDataPtr)[12])) |
(inPixelsB2 ^ (inPixelsB = ((unsigned*)lineDataPtr)[13]))) == 0 ? outPixels :
(outPixels = (*(unsigned*)(bigcoltab640a + inPixelsA)
^ *(unsigned*)(bigcoltab640b + inPixelsB)));
*(destPtr+7) =
((inPixelsA ^ (inPixelsA2 = ((unsigned*)lineDataPtr)[14])) |
(inPixelsB ^ (inPixelsB2 = ((unsigned*)lineDataPtr)[15]))) == 0 ? outPixels :
((*(unsigned*)(bigcoltab640a + inPixelsA2)
^ *(unsigned*)(bigcoltab640b + inPixelsB2)));
destPtr += 8;
lineDataPtr += 32;
}
@ -158,7 +173,6 @@ void RawDraw (void) {
}
else { /* 320 mode */
while (destPtr + 7 < finalDestPtr) { /* Unrolled loop */
unsigned inPixelsA, inPixelsB, outPixels;
*(unsigned*)destPtr =
outPixels = *(unsigned*)(bigcoltab320 + (inPixelsA = *(unsigned*)lineDataPtr));
*(unsigned*)(destPtr+1) =