/*
* _gsk_cairo_blur_surface:
* @surface: a cairo image surface.
* @radius: the blur radius.
*
* Blurs the cairo image surface at the given radius.
*/
void
gsk_cairo_blur_surface (cairo_surface_t* surface,
double radius_d,
GskBlurFlags flags)
{
int radius = radius_d;
g_return_if_fail (surface != NULL);
g_return_if_fail (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE);
g_return_if_fail (cairo_image_surface_get_format (surface) == CAIRO_FORMAT_A8);
/* The code doesn't actually do any blurring for radius 1, as it
* ends up with box filter size 1 */
if (radius <= 1)
return;
if ((flags & (GSK_BLUR_X|GSK_BLUR_Y)) == 0)
return;
/* Before we mess with the surface, execute any pending drawing. */
cairo_surface_flush (surface);
_boxblur (cairo_image_surface_get_data (surface),
cairo_image_surface_get_stride (surface),
cairo_image_surface_get_height (surface),
radius, flags);
/* Inform cairo we altered the surface contents. */
cairo_surface_mark_dirty (surface);
}
/*
* _gtk_cairo_blur_surface:
* @surface: a cairo image surface.
* @radius: the blur radius.
*
* Blurs the cairo image surface at the given radius.
*/
void
_gtk_cairo_blur_surface (cairo_surface_t* surface,
double radius_d)
{
cairo_format_t format;
int radius = radius_d;
g_return_if_fail (surface != NULL);
g_return_if_fail (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE);
format = cairo_image_surface_get_format (surface);
g_return_if_fail (format == CAIRO_FORMAT_A8);
if (radius == 0)
return;
/* Before we mess with the surface, execute any pending drawing. */
cairo_surface_flush (surface);
_boxblur (cairo_image_surface_get_data (surface),
cairo_image_surface_get_stride (surface),
cairo_image_surface_get_height (surface),
radius);
/* Inform cairo we altered the surface contents. */
cairo_surface_mark_dirty (surface);
}
