mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-06 09:05:45 +00:00
58 lines
2.5 KiB
Diff
58 lines
2.5 KiB
Diff
diff --git a/gfx/cairo/cairo/src/cairo-quartz-surface.c b/gfx/cairo/cairo/src/cairo-quartz-surface.c
|
|
--- a/gfx/cairo/cairo/src/cairo-quartz-surface.c
|
|
+++ b/gfx/cairo/cairo/src/cairo-quartz-surface.c
|
|
@@ -690,31 +690,51 @@ ComputeGradientValue (void *info, const
|
|
}
|
|
|
|
static const float gradient_output_value_ranges[8] = {
|
|
0.f, 1.f, 0.f, 1.f, 0.f, 1.f, 0.f, 1.f
|
|
};
|
|
static const CGFunctionCallbacks gradient_callbacks = {
|
|
0, ComputeGradientValue, (CGFunctionReleaseInfoCallback) cairo_pattern_destroy
|
|
};
|
|
+/* Quartz will clamp input values to the input range.
|
|
+
|
|
+ Our stops are all in the range 0.0 to 1.0. However, the color before the
|
|
+ beginning of the gradient line is obtained by Quartz computing a negative
|
|
+ position on the gradient line, clamping it to the input range we specified
|
|
+ for our color function, and then calling our color function (actually it
|
|
+ pre-samples the color function into an array, but that doesn't matter just
|
|
+ here). Therefore if we set the lower bound to 0.0, a negative position
|
|
+ on the gradient line will pass 0.0 to ComputeGradientValue, which will
|
|
+ select the last color stop with position 0, although it should select
|
|
+ the first color stop (this matters when there are multiple color stops with
|
|
+ position 0).
|
|
+
|
|
+ Therefore we pass a small negative number as the lower bound of the input
|
|
+ range, so this value gets passed into ComputeGradientValue, which will
|
|
+ return the color of the first stop. The number should be small because
|
|
+ as far as I can tell, Quartz pre-samples the entire input range of the color
|
|
+ function into an array of fixed size, so if the input range is larger
|
|
+ than needed, the resolution of the gradient will be unnecessarily low.
|
|
+*/
|
|
+static const float nonrepeating_gradient_input_value_range[2] = { -0.001f, 1.f };
|
|
|
|
static CGFunctionRef
|
|
CreateGradientFunction (const cairo_gradient_pattern_t *gpat)
|
|
{
|
|
cairo_pattern_t *pat;
|
|
- float input_value_range[2] = { 0.f, 1.f };
|
|
|
|
if (_cairo_pattern_create_copy (&pat, &gpat->base))
|
|
/* quartz doesn't deal very well with malloc failing, so there's
|
|
* not much point in us trying either */
|
|
return NULL;
|
|
|
|
return CGFunctionCreate (pat,
|
|
1,
|
|
- input_value_range,
|
|
+ nonrepeating_gradient_input_value_range,
|
|
4,
|
|
gradient_output_value_ranges,
|
|
&gradient_callbacks);
|
|
}
|
|
|
|
static void
|
|
UpdateLinearParametersToIncludePoint(double *min_t, double *max_t, CGPoint *start,
|
|
double dx, double dy,
|