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sna/trapezoids: Skip the division when converting coverage to floating point 

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-07-01 12:39:13 +01:00
parent 182c3637cc
commit 675cbd5fad
1 changed files with 6 additions and 4 deletions
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10
src/sna/sna_trapezoids.c
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@ -2770,6 +2770,7 @@ composite_unaligned_trap_row(struct sna *sna,
BoxRec box;
int opacity;
int x1, x2;
#define u8_to_float(x) ((x) * (1.f/255))
if (covered == 0)
return;
@ -2800,7 +2801,7 @@ composite_unaligned_trap_row(struct sna *sna,
if (opacity)
composite_unaligned_box(sna, tmp, &box,
opacity/255., clip);
u8_to_float(opacity), clip);
} else {
if (pixman_fixed_frac(trap->left.p1.x)) {
box.x1 = x1;
@ -2811,7 +2812,7 @@ composite_unaligned_trap_row(struct sna *sna,
if (opacity)
composite_unaligned_box(sna, tmp, &box,
opacity/255., clip);
u8_to_float(opacity), clip);
}
if (x2 > x1) {
@ -2819,7 +2820,8 @@ composite_unaligned_trap_row(struct sna *sna,
box.x2 = x2;
composite_unaligned_box(sna, tmp, &box,
covered*SAMPLES_X/255., clip);
covered == SAMPLES_Y ? 1. : u8_to_float(covered*SAMPLES_X),
clip);
}
if (pixman_fixed_frac(trap->right.p1.x)) {
@ -2831,7 +2833,7 @@ composite_unaligned_trap_row(struct sna *sna,
if (opacity)
composite_unaligned_box(sna, tmp, &box,
opacity/255., clip);
u8_to_float(opacity), clip);
}
}
}