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Fix #2488 for fb too: sample pixel center when transforming.

This commit is contained in:
Kristian Høgsberg 2006-06-21 16:22:14 -04:00
parent ea5e0eabd1
commit ed18d776f0
1 changed files with 15 additions and 6 deletions
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21
fb/fbcompose.c
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@ -2726,8 +2726,9 @@ static void fbFetchSourcePict(PicturePtr pict, int x, int y, int width, CARD32 *
xFixed_32_32 l;
xFixed_48_16 dx, dy, a, b, off;
v.vector[0] = IntToxFixed(x);
v.vector[1] = IntToxFixed(y);
/* reference point is the center of the pixel */
v.vector[0] = IntToxFixed(x) + xFixed1/2;
v.vector[1] = IntToxFixed(y) + xFixed1/2;
v.vector[2] = xFixed1;
if (pict->transform) {
if (!PictureTransformPoint3d (pict->transform, &v))
@ -2793,8 +2794,9 @@ static void fbFetchSourcePict(PicturePtr pict, int x, int y, int width, CARD32 *
if (pict->transform) {
PictVector v;
v.vector[0] = IntToxFixed(x);
v.vector[1] = IntToxFixed(y);
/* reference point is the center of the pixel */
v.vector[0] = IntToxFixed(x) + xFixed1/2;
v.vector[1] = IntToxFixed(y) + xFixed1/2;
v.vector[2] = xFixed1;
if (!PictureTransformPoint3d (pict->transform, &v))
return;
@ -2914,8 +2916,9 @@ static void fbFetchTransformed(PicturePtr pict, int x, int y, int width, CARD32
dx = pict->pDrawable->x;
dy = pict->pDrawable->y;
v.vector[0] = IntToxFixed(x - dx);
v.vector[1] = IntToxFixed(y - dy);
/* reference point is the center of the pixel */
v.vector[0] = IntToxFixed(x - dx) + xFixed1 / 2;
v.vector[1] = IntToxFixed(y - dy) + xFixed1 / 2;
v.vector[2] = xFixed1;
/* when using convolution filters one might get here without a transform */
@ -3020,6 +3023,12 @@ static void fbFetchTransformed(PicturePtr pict, int x, int y, int width, CARD32
}
}
} else if (pict->filter == PictFilterBilinear) {
/* adjust vector for maximum contribution at 0.5, 0.5 of each texel. */
v.vector[0] -= v.vector[2] / 2;
v.vector[1] -= v.vector[2] / 2;
unit.vector[0] -= unit.vector[2] / 2;
unit.vector[1] -= unit.vector[2] / 2;
if (pict->repeatType == RepeatNormal) {
if (REGION_NUM_RECTS(pict->pCompositeClip) == 1) {
for (i = 0; i < width; ++i) {