diff options
Diffstat (limited to 'pixman/pixman/pixman.h')
| -rw-r--r-- | pixman/pixman/pixman.h | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/pixman/pixman/pixman.h b/pixman/pixman/pixman.h index 08494c467..27eeeee4e 100644 --- a/pixman/pixman/pixman.h +++ b/pixman/pixman/pixman.h @@ -841,19 +841,25 @@ void pixman_image_composite32 (pixman_op_t op, int32_t width,
int32_t height);
-/* Old X servers rely on out-of-bounds accesses when they are asked
- * to composite with a window as the source. They create a pixman image
- * pointing to some bogus position in memory, but then they set a clip
- * region to the position where the actual bits are.
+/* Executive Summary: This function is a no-op that only exists
+ * for historical reasons.
+ *
+ * There used to be a bug in the X server where it would rely on
+ * out-of-bounds accesses when it was asked to composite with a
+ * window as the source. It would create a pixman image pointing
+ * to some bogus position in memory, but then set a clip region
+ * to the position where the actual bits were.
*
* Due to a bug in old versions of pixman, where it would not clip
* against the image bounds when a clip region was set, this would
- * actually work. So by default we allow certain out-of-bound access
- * to happen unless explicitly disabled.
+ * actually work. So when the pixman bug was fixed, a workaround was
+ * added to allow certain out-of-bound accesses. This function disabled
+ * those workarounds.
*
- * Fixed X servers should call this function to disable the workaround.
+ * Since 0.21.2, pixman doesn't do these workarounds anymore, so now this
+ * function is a no-op.
*/
-void pixman_disable_out_of_bounds_workaround (void);
+void pixman_disable_out_of_bounds_workaround (void);
/*
* Trapezoids
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