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small optimization (do three memory reads instead of five)

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svn-id: r6875
This commit is contained in:
Max Horn 2003-03-28 19:13:59 +00:00
parent fb7fdc8e7e
commit fe58fd4d1e
1 changed files with 22 additions and 19 deletions
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41
common/scaler.cpp
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@ -719,31 +719,34 @@ void Scale_2xSaI(uint8 *srcPtr, uint32 srcPitch, uint8 * /* deltaPtr */ ,
void AdvMame2x(uint8 *srcPtr, uint32 srcPitch, uint8 *null, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
unsigned int nextlineSrc = srcPitch / sizeof(short);
short *p = (short *)srcPtr;
unsigned int nextlineSrc = srcPitch / sizeof(uint16);
uint16 *p = (uint16 *)srcPtr;
unsigned int nextlineDst = dstPitch / sizeof(short);
short *q = (short *)dstPtr;
unsigned int nextlineDst = dstPitch / sizeof(uint16);
uint16 *q = (uint16 *)dstPtr;
uint16 A, B, C;
uint16 D, E, F;
uint16 G, H, I;
while (height--) {
B = C = *(p - nextlineSrc);
E = F = *(p);
H = I = *(p + nextlineSrc);
for (int i = 0; i < width; ++i) {
// short A = *(p + i - nextlineSrc - 1);
short B = *(p + i - nextlineSrc);
// short C = *(p + i - nextlineSrc + 1);
short D = *(p + i - 1);
short E = *(p + i);
short F = *(p + i + 1);
// short G = *(p + i + nextlineSrc - 1);
short H = *(p + i + nextlineSrc);
// short I = *(p + i + nextlineSrc + 1);
p++;
A = B; B = C; C = *(p - nextlineSrc);
D = E; E = F; F = *(p);
G = H; H = I; I = *(p + nextlineSrc);
*(q + (i << 1)) = D == B && B != F && D != H ? D : E;
*(q + (i << 1) + 1) = B == F && B != D && F != H ? F : E;
*(q + (i << 1) + nextlineDst) = D == H && D != B && H != F ? D : E;
*(q + (i << 1) + nextlineDst + 1) = H == F && D != H && B != F ? F : E;
*(q) = D == B && B != F && D != H ? D : E;
*(q + 1) = B == F && B != D && F != H ? F : E;
*(q + nextlineDst) = D == H && D != B && H != F ? D : E;
*(q + nextlineDst + 1) = H == F && D != H && B != F ? F : E;
q += 2;
}
p += nextlineSrc;
q += nextlineDst << 1;
p += nextlineSrc - width;
q += (nextlineDst - width) << 1;
}
}