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make ImagingGetBand faster

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This commit is contained in:
Alexander 2017-08-12 13:10:26 +03:00
parent 5f5ac09158
commit c23b65c670
1 changed files with 13 additions and 1 deletions
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14
libImaging/Bands.c
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@ -22,6 +22,13 @@
#define CLIP(x) ((x) <= 0 ? 0 : (x) < 256 ? (x) : 255)
#ifdef WORDS_BIGENDIAN
#define MAKE_UINT32(u0, u1, u2, u3) (u3 | (u2<<8) | (u1<<16) | (u0<<24))
#else
#define MAKE_UINT32(u0, u1, u2, u3) (u0 | (u1<<8) | (u2<<16) | (u3<<24))
#endif
Imaging
ImagingGetBand(Imaging imIn, int band)
{
@ -51,7 +58,12 @@ ImagingGetBand(Imaging imIn, int band)
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y] + band;
UINT8* out = imOut->image8[y];
for (x = 0; x < imIn->xsize; x++) {
x = 0;
for (; x < imIn->xsize - 3; x += 4) {
*((UINT32*) (out + x)) = MAKE_UINT32(in[0], in[4], in[8], in[12]);
in += 16;
}
for (; x < imIn->xsize; x++) {
out[x] = *in;
in += 4;
}