[cairo] [PATCH pixman 04/11] pixman-filter: Speed up the BOX+BOX filter
Bill Spitzak
spitzak at gmail.com
Mon Sep 22 19:30:05 PDT 2014
This is easy as the caller already intersected the two boxes.
---
pixman/pixman-filter.c | 25 +++++++++++++++----------
1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/pixman/pixman-filter.c b/pixman/pixman-filter.c
index a9af72c..4ff02ec 100644
--- a/pixman/pixman-filter.c
+++ b/pixman/pixman-filter.c
@@ -160,6 +160,21 @@ integral (pixman_kernel_t kernel1, double x1,
pixman_kernel_t kernel2, double scale, double x2,
double width)
{
+ if (kernel1 == PIXMAN_KERNEL_IMPULSE)
+ {
+ assert (width == 0.0);
+ return filters[kernel2].func (x2 * scale);
+ }
+ else if (kernel1 == PIXMAN_KERNEL_BOX && kernel2 == PIXMAN_KERNEL_BOX)
+ {
+ assert (width <= 1.0);
+ return width;
+ }
+ else if (kernel2 == PIXMAN_KERNEL_IMPULSE)
+ {
+ assert (width == 0.0);
+ return filters[kernel1].func (x1);
+ }
/* If the integration interval crosses zero, break it into
* two separate integrals. This ensures that filters such
* as LINEAR that are not differentiable at 0 will still
@@ -177,16 +192,6 @@ integral (pixman_kernel_t kernel1, double x1,
integral (kernel1, x1, kernel2, scale, x2, - x2) +
integral (kernel1, x1 - x2, kernel2, scale, 0, width + x2);
}
- else if (kernel1 == PIXMAN_KERNEL_IMPULSE)
- {
- assert (width == 0.0);
- return filters[kernel2].func (x2 * scale);
- }
- else if (kernel2 == PIXMAN_KERNEL_IMPULSE)
- {
- assert (width == 0.0);
- return filters[kernel1].func (x1);
- }
else
{
/* Integration via Simpson's rule */
--
1.7.9.5
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