andreacavalli/xserver-multidpi
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- Don't require Imrecise mode for Trapezoid acceleration. It looks like we

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might be able to do Precise in hardware, so leave it up to the driver.
- Add a helper function for computing a set of offsets for smooth trapezoid
    rasterizing using many sharp trapezoids.
This commit is contained in:
Eric Anholt 2004-09-11 09:23:12 +00:00
parent 501dcf37aa
commit 396100dd23
2 changed files with 34 additions and 1 deletions
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4
hw/kdrive/src/kaa.h
View File

@ -104,4 +104,8 @@ kaaRasterizeTrapezoid(PicturePtr pPict,
int xoff,
int yoff);
void
kaaInitTrapOffsets(int grid_order, float *x_offsets, float *y_offsets,
float x_offset, float y_offset);
#endif /* _KAA_H_ */

31
hw/kdrive/src/kaapict.c
View File

@ -637,6 +637,13 @@ miLineFixedX (xLineFixed *l, xFixed y, Bool ceil)
*/
#define XFIXED_TO_FLOAT(x) (((float)((x) & 0xffffff00)) / 65536.0)
/* This is just to allow us to work on the hardware side of the problem while
* waiting for cairo to get a new tesselator. We may not be able to support
* RasterizeTrapezoid at all due to the abutting edges requirement, but it might
* be technically legal if we widened the trap by some epsilon, so that alpha
* values at abutting edges were a little too big and capped at one, rather than
* a little too small and looked bad.
*/
void kaaRasterizeTrapezoid(PicturePtr pDst,
xTrapezoid *trap,
int xoff,
@ -651,7 +658,6 @@ void kaaRasterizeTrapezoid(PicturePtr pDst,
if (!pScreenPriv->enabled ||
!pKaaScr->info->PrepareTrapezoids ||
pDst->pDrawable->type != DRAWABLE_PIXMAP ||
pDst->polyMode == PolyModePrecise ||
pDst->alphaMap || pDst->format != PICT_a8)
{
KdCheckRasterizeTrapezoid (pDst, trap, xoff, yoff);
@ -688,3 +694,26 @@ void kaaRasterizeTrapezoid(PicturePtr pDst,
(*pKaaScr->info->Trapezoids) (&ktrap, 1);
(*pKaaScr->info->DoneTrapezoids) ();
}
void
kaaInitTrapOffsets(int grid_order, float *x_offsets, float *y_offsets,
float x_offset, float y_offset)
{
int i = 0;
float x, y, x_count, y_count;
x_count = (1 << (grid_order / 2)) + 1;
y_count = (1 << (grid_order / 2)) - 1;
x_offset += 1.0 / x_count / 2.0;
y_offset += 1.0 / y_count / 2.0;
for (x = 0; x < x_count; x++) {
for (y = 0; y < y_count; y++) {
x_offsets[i] = x / x_count + x_offset;
y_offsets[i] = y / y_count + y_offset;
i++;
}
}
}