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it's implementation detail (SSE rounds automatically)

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Alexander 2017-08-13 17:39:22 +03:00
parent 3949fc812a
commit c5865f9abe
1 changed files with 8 additions and 3 deletions
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11
libImaging/Filter.c
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@ -120,6 +120,8 @@ ImagingFilter3x3(Imaging imOut, Imaging im, const float* kernel,
memcpy(imOut->image[0], im->image[0], im->linesize);
if (im->bands == 1) {
// Add one time for rounding
offset += 0.5;
for (y = 1; y < im->ysize-1; y++) {
UINT8* in_1 = (UINT8*) im->image[y-1];
UINT8* in0 = (UINT8*) im->image[y];
@ -137,6 +139,8 @@ ImagingFilter3x3(Imaging imOut, Imaging im, const float* kernel,
out[x] = in0[x];
}
} else {
// Add one time for rounding
offset += 0.5;
for (y = 1; y < im->ysize-1; y++) {
UINT8* in_1 = (UINT8*) im->image[y-1];
UINT8* in0 = (UINT8*) im->image[y];
@ -218,6 +222,8 @@ ImagingFilter5x5(Imaging imOut, Imaging im, const float* kernel,
memcpy(imOut->image[0], im->image[0], im->linesize);
memcpy(imOut->image[1], im->image[1], im->linesize);
if (im->bands == 1) {
// Add one time for rounding
offset += 0.5;
for (y = 2; y < im->ysize-2; y++) {
UINT8* in_2 = (UINT8*) im->image[y-2];
UINT8* in_1 = (UINT8*) im->image[y-1];
@ -241,6 +247,8 @@ ImagingFilter5x5(Imaging imOut, Imaging im, const float* kernel,
out[x+1] = in0[x+1];
}
} else {
// Add one time for rounding
offset += 0.5;
for (y = 2; y < im->ysize-2; y++) {
UINT8* in_2 = (UINT8*) im->image[y-2];
UINT8* in_1 = (UINT8*) im->image[y-1];
@ -348,9 +356,6 @@ ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
if (!imOut)
return NULL;
// Add one time for rounding
offset += 0.5;
ImagingSectionEnter(&cookie);
if (xsize == 3) {
/* 3x3 kernel. */