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Print a warning when creating a cairo_t while painting

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If you create a Cairo context in the middle of a paint run and then
you destroy it, the CairoTexture will have to upload the contents of
the image surface to the GL pipeline. This usually leads to slow
downs and general performance degradation.

ClutterCairoTexture will warn to the console if Clutter has been
compiled with the debug messages and if create() or create_region()
are called while an actor is in the middle of a paint.
This commit is contained in:
Emmanuele Bassi 2008-12-11 15:48:43 +00:00
parent 1b88122873
commit cf9dea7cf6
1 changed files with 17 additions and 2 deletions
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19
clutter/clutter-cairo-texture.c
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@ -53,9 +53,10 @@
* cairo_destroy (cr);
* ]|
*
* Note that you should never use the code above inside the
* <warning><para>Note that you should never use the code above inside the
* #ClutterActor::paint or #ClutterActor::pick virtual functions or
* signal handlers because of performance degradation.
* signal handlers because it will lead to performance
* degradation.</para></warning>
*
* <note><para>Since #ClutterCairoTexture uses a Cairo image surface
* internally all the drawing operations will be performed in
@ -88,6 +89,18 @@ enum
PROP_SURFACE_HEIGHT
};
#ifdef CLUTTER_ENABLE_DEBUG
#define clutter_return_val_if_paint_fail(obj,retval) G_STMT_START { \
if (CLUTTER_PRIVATE_FLAGS ((obj)) & CLUTTER_ACTOR_IN_PAINT) { \
g_warning ("%s should not be called during the paint sequence " \
"of a ClutterCairoTexture as it will likely cause " \
"performance issues.", G_STRFUNC); \
return (retval); \
} } G_STMT_END
#else
#define clutter_return_val_if_paint_fail(obj,retval) /* void */
#endif /* CLUTTER_ENABLE_DEBUG */
#define CLUTTER_CAIRO_TEXTURE_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_CAIRO_TEXTURE, ClutterCairoTexturePrivate))
struct _ClutterCairoTexturePrivate
@ -564,6 +577,7 @@ clutter_cairo_texture_create_region (ClutterCairoTexture *self,
cairo_t *cr;
g_return_val_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self), NULL);
clutter_return_val_if_paint_fail (self, NULL);
priv = self->priv;
@ -619,6 +633,7 @@ cairo_t *
clutter_cairo_texture_create (ClutterCairoTexture *self)
{
g_return_val_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self), NULL);
clutter_return_val_if_paint_fail (self, NULL);
return clutter_cairo_texture_create_region (self, 0, 0, -1, -1);
}