c683d971a1
The helper is X11 specific and only used once in that file. Moving it there would help us in the future to build without cairo if x11 is disabled Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3292>
117 lines
4.0 KiB
C
117 lines
4.0 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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#pragma once
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#include <glib.h>
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#include "backends/meta-backend-types.h"
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#include "clutter/clutter.h"
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#include "core/boxes-private.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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* MtkRegion 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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MtkRegion *region;
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MtkRectangle 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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MtkRectangle 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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MtkRegion *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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MtkRegion * meta_region_builder_finish (MetaRegionBuilder *builder);
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void meta_region_iterator_init (MetaRegionIterator *iter,
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MtkRegion *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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MtkRegion * meta_region_scale (MtkRegion *region,
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int scale);
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MtkRegion * meta_make_border_region (MtkRegion *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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MtkRegion * meta_region_transform (const MtkRegion *region,
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MetaMonitorTransform transform,
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int width,
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int height);
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MtkRegion * meta_region_crop_and_scale (MtkRegion *region,
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graphene_rect_t *src_rect,
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int dst_width,
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int dst_height);
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MtkRegion *
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meta_region_apply_matrix_transform_expand (const MtkRegion *region,
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graphene_matrix_t *transform);
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