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[cairo-xlib-surface] Optimize away clip that covers the entire surface.

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Replace a clip rectangle that covers the entire surface with no
clipping as this is quite a common operation when toolkits (i.e. GTK+)
clear surfaces before drawing and avoids a redundant
XRenderSetClipRectangles.
This commit is contained in:
Chris Wilson 2007-10-11 22:51:09 +01:00
parent b06bd9379a
commit f2ea46edf4
1 changed files with 17 additions and 1 deletions
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18
src/cairo-xlib-surface.c
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@ -1979,8 +1979,9 @@ _cairo_xlib_surface_set_clip_region (void *abstract_surface,
cairo_region_t *region)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_bool_t had_clip_rects = surface->have_clip_rects;
if (surface->have_clip_rects == FALSE && region == NULL)
if (had_clip_rects == FALSE && region == NULL)
return CAIRO_STATUS_SUCCESS;
if (surface->clip_rects != surface->embedded_clip_rects) {
@ -2046,9 +2047,24 @@ _cairo_xlib_surface_set_clip_region (void *abstract_surface,
surface->have_clip_rects = TRUE;
surface->clip_rects = rects;
surface->num_clip_rects = n_boxes;
/* Discard the trivial clip rectangle that covers the entire surface */
if (n_boxes == 1 &&
rects[0].x == 0 &&
rects[0].y == 0 &&
rects[0].width == surface->width &&
rects[0].height == surface->height)
{
surface->have_clip_rects = FALSE;
surface->num_clip_rects = 0;
if (! had_clip_rects)
goto DONE;
}
}
surface->clip_dirty = CAIRO_XLIB_SURFACE_CLIP_DIRTY_ALL;
DONE:
return CAIRO_STATUS_SUCCESS;
}