uxa: Reuse in-flight bo

When we need to allocate a new bo for use as a gpu target, first check
if we can reuse a pixmap that has already been relocated into the
aperture as a temporary target, for instance a glyph mask or a clip mask.

Before:
backend                      test   min(s) median(s) stddev.
xlib         firefox-planet-gnome   50.568   50.873   0.30%
 xcb         firefox-planet-gnome   49.686   53.003   3.92%
xlib                    evolution   40.115   40.131   0.86%
 xcb                    evolution   28.241   28.285   0.18%

After:
backend                      test   min(s) median(s) stddev.
xlib         firefox-planet-gnome   47.759   48.233   0.80%
 xcb         firefox-planet-gnome   48.611   48.657   0.87%
xlib                    evolution   38.954   38.991   0.05%
 xcb                    evolution   26.561   26.654   0.19%

And even more dramatic improvements when using a font size larger than
the maximum size of the glyph cache:
 xcb firefox-36-20090611:  1.79x speedup
xlib firefox-36-20090611:  1.74x speedup
 xcb firefox-36-20090609:  1.62x speedup
xlib firefox-36-20090609:  1.59x speedup

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 11 insertions, 2 deletions

diff --git a/src/i830.h b/src/i830.h
index 43c58875..88949f6f 100644
--- a/src/i830.h
+++ b/src/i830.h
@@ -136,14 +136,22 @@ list_is_empty(struct list *head)
 #define list_first_entry(ptr, type, member) \
 	list_entry((ptr)->next, type, member)
 
+#define list_foreach(pos, head)			\
+	for (pos = (head)->next; pos != (head);	pos = pos->next)
+
+#define list_foreach_entry(pos, type, head, member)		\
+	for (pos = list_entry((head)->next, type, member);\
+	     &pos->member != (head);					\
+	     pos = list_entry(pos->member.next, type, member))
+
 struct intel_pixmap {
 	dri_bo *bo;
-	uint32_t tiling;
+	uint32_t tiling, stride;
 	uint32_t flush_write_domain;
 	uint32_t flush_read_domains;
 	uint32_t batch_write_domain;
 	uint32_t batch_read_domains;
-	struct list flush, batch;
+	struct list flush, batch, in_flight;
 };
 
 struct intel_pixmap *i830_get_pixmap_intel(PixmapPtr pixmap);
@@ -252,6 +260,7 @@ typedef struct intel_screen_private {
 	int batch_atomic_limit;
 	struct list batch_pixmaps;
 	struct list flush_pixmaps;
+	struct list in_flight;
 
 	/* For Xvideo */
 	Bool use_drmmode_overlay;