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The current shadow code just uses a single fixed texture (the Gaussian blur of a rectangle with a fixed blur radius) for drawing all window shadows. This patch adds the ability * Implement efficient blurring of arbitrary regions by approximating a Gaussian blur with multiple box blurs. * Detect when multiple windows can use the same shadow texture by converting their shape into a size-invariant MetaWindowShape. * Add properties shadow-radius, shadow-x-offset, shadow-y-offset, shadow-opacity to allow the shadow for a window to be configured. * Add meta_window_actor_paint() and draw the shadow directly from there rather than using a child actor. * Remove TidyTextureFrame, which is no longer used https://bugzilla.gnome.org/show_bug.cgi?id=592382
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* Utilities for region manipulation
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*
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* Copyright (C) 2010 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef __META_REGION_UTILS_H__
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#define __META_REGION_UTILS_H__
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#include <clutter/clutter.h>
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#include <cairo.h>
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#include <glib.h>
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/**
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* MetaRegionIterator:
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* @region: region being iterated
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* @rectangle: current rectangle
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* @line_start: whether the current rectangle starts a horizontal band
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* @line_end: whether the current rectangle ends a horizontal band
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*
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* cairo_region_t is a yx banded region; sometimes its useful to iterate through
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* such a region treating the start and end of each horizontal band in a distinct
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* fashion.
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*
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* Usage:
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*
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* MetaRegionIterator iter;
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* for (meta_region_iterator_init (&iter, region);
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* !meta_region_iterator_at_end (&iter);
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* meta_region_iterator_next (&iter))
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* {
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* [ Use iter.rectangle, iter.line_start, iter.line_end ]
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* }
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*/
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typedef struct _MetaRegionIterator MetaRegionIterator;
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struct _MetaRegionIterator {
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cairo_region_t *region;
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cairo_rectangle_int_t rectangle;
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gboolean line_start;
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gboolean line_end;
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int i;
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/*< private >*/
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int n_rectangles;
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cairo_rectangle_int_t next_rectangle;
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};
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void meta_region_iterator_init (MetaRegionIterator *iter,
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cairo_region_t *region);
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gboolean meta_region_iterator_at_end (MetaRegionIterator *iter);
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void meta_region_iterator_next (MetaRegionIterator *iter);
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cairo_region_t *meta_make_border_region (cairo_region_t *region,
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int x_amount,
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int y_amount,
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gboolean flip);
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#endif /* __META_REGION_UTILS_H__ */
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