2f4a68c8c3
The order and way include macros were structured was chaotic, with no real common thread between files. Try to tidy up the mess with some common scheme, to make things look less messy.
113 lines
3.8 KiB
C
113 lines
3.8 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, see <http://www.gnu.org/licenses/>.
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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 <cairo.h>
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#include <glib.h>
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#include "clutter/clutter.h"
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typedef enum _MetaRoundingStrategy
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{
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META_ROUNDING_STRATEGY_SHRINK,
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META_ROUNDING_STRATEGY_GROW,
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} MetaRoundingStrategy;
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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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typedef struct _MetaRegionBuilder MetaRegionBuilder;
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#define META_REGION_BUILDER_MAX_LEVELS 16
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struct _MetaRegionBuilder {
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/* To merge regions in binary tree order, we need to keep track of
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* the regions that we've already merged together at different
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* levels of the tree. We fill in an array in the pattern:
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*
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* |a |
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* |b |a |
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* |c | |ab |
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* |d |c |ab |
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* |e | | |abcd|
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*/
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cairo_region_t *levels[META_REGION_BUILDER_MAX_LEVELS];
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int n_levels;
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};
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void meta_region_builder_init (MetaRegionBuilder *builder);
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void meta_region_builder_add_rectangle (MetaRegionBuilder *builder,
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int x,
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int y,
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int width,
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int height);
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cairo_region_t * meta_region_builder_finish (MetaRegionBuilder *builder);
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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_region_scale (cairo_region_t *region,
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int scale);
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cairo_region_t * meta_region_scale_double (cairo_region_t *region,
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double scale,
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MetaRoundingStrategy rounding_strategy);
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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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