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sna/gradient: Compute the absolute delta between color stops 

Otherwise we do not detect gradients that start from white!

Reported-by: Clemens Eisserer <linuxhippy@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=48407
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-04-07 10:01:01 +01:00
parent 4356fae72d
commit 1ecf17b250
1 changed files with 14 additions and 5 deletions
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19
src/sna/sna_gradient.c
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@ -44,39 +44,48 @@ sna_gradient_sample_width(PictGradient *gradient)
{
int n, width;
width = 2;
width = 0;
for (n = 1; n < gradient->nstops; n++) {
xFixed dx = gradient->stops[n].x - gradient->stops[n-1].x;
uint16_t delta, max;
int ramp;
int delta, max, ramp;
if (dx == 0)
return 1024;
max = gradient->stops[n].color.red -
gradient->stops[n-1].color.red;
if (max < 0)
max = -max;
delta = gradient->stops[n].color.green -
gradient->stops[n-1].color.green;
if (delta < 0)
delta = -delta;
if (delta > max)
max = delta;
delta = gradient->stops[n].color.blue -
gradient->stops[n-1].color.blue;
if (delta < 0)
delta = -delta;
if (delta > max)
max = delta;
delta = gradient->stops[n].color.alpha -
gradient->stops[n-1].color.alpha;
if (delta < 0)
delta = -delta;
if (delta > max)
max = delta;
ramp = 128 * max / dx;
ramp = 256 * max / dx;
if (ramp > width)
width = ramp;
}
width *= gradient->nstops-1;
if (width == 0)
return 1;
width = (width + 7) & -8;
return min(width, 1024);
}