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Add internal gdk_cairo_region_from_clip helper

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This extract the current cairo clip region if possible and
returns it as a cairo_region_T. It will be needed by later code.
This commit is contained in:
Alexander Larsson 2014-10-09 09:58:36 +02:00 committed by Matthias Clasen
parent 892c6bd6f9
commit ceeed1c48d
2 changed files with 39 additions and 2 deletions
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35
gdk/gdkcairo.c
View File

@ -525,3 +525,38 @@ gdk_cairo_region_create_from_surface (cairo_surface_t *surface)
return region;
}
cairo_region_t *
gdk_cairo_region_from_clip (cairo_t *cr)
{
cairo_rectangle_list_t *rectangles;
cairo_region_t *region;
int i;
rectangles = cairo_copy_clip_rectangle_list (cr);
if (rectangles->status != CAIRO_STATUS_SUCCESS)
return NULL;
region = cairo_region_create ();
for (i = 0; i < rectangles->num_rectangles; i++)
{
cairo_rectangle_int_t clip_rect;
cairo_rectangle_t *rect;
rect = &rectangles->rectangles[i];
/* Here we assume clip rects are ints for direct targets, which
is true for cairo */
clip_rect.x = (int)rect->x;
clip_rect.y = (int)rect->y;
clip_rect.width = (int)rect->width;
clip_rect.height = (int)rect->height;
cairo_region_union_rectangle (region, &clip_rect);
}
cairo_rectangle_list_destroy (rectangles);
return region;
}

6
gdk/gdkinternals.h
View File

@ -319,8 +319,10 @@ void _gdk_windowing_event_data_free (GdkEvent *event);
void _gdk_set_window_state (GdkWindow *window,
GdkWindowState new_state);
gboolean _gdk_cairo_surface_extents (cairo_surface_t *surface,
GdkRectangle *extents);
gboolean _gdk_cairo_surface_extents (cairo_surface_t *surface,
GdkRectangle *extents);
cairo_region_t *gdk_cairo_region_from_clip (cairo_t *cr);
/*************************************
* Interfaces used by windowing code *