forked from KolibriOS/kolibrios
906 lines
25 KiB
C
906 lines
25 KiB
C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2005 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Red Hat, Inc.
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*
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* Contributor(s):
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* Owen Taylor <otaylor@redhat.com>
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* Vladimir Vukicevic <vladimir@pobox.com>
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* Søren Sandmann <sandmann@daimi.au.dk>
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*/
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#include "cairoint.h"
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#include "cairo-error-private.h"
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#include "cairo-region-private.h"
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/* XXX need to update pixman headers to be const as appropriate */
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#define CONST_CAST (pixman_region32_t *)
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/**
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* SECTION:cairo-region
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* @Title: Regions
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* @Short_Description: Representing a pixel-aligned area
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*
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* Regions are a simple graphical data type representing an area of
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* integer-aligned rectangles. They are often used on raster surfaces
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* to track areas of interest, such as change or clip areas.
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*/
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static const cairo_region_t _cairo_region_nil = {
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CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */
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CAIRO_STATUS_NO_MEMORY, /* status */
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};
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cairo_region_t *
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_cairo_region_create_in_error (cairo_status_t status)
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{
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switch (status) {
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case CAIRO_STATUS_NO_MEMORY:
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return (cairo_region_t *) &_cairo_region_nil;
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case CAIRO_STATUS_SUCCESS:
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case CAIRO_STATUS_LAST_STATUS:
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ASSERT_NOT_REACHED;
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/* fall-through */
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case CAIRO_STATUS_SURFACE_TYPE_MISMATCH:
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case CAIRO_STATUS_INVALID_STATUS:
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case CAIRO_STATUS_INVALID_CONTENT:
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case CAIRO_STATUS_INVALID_FORMAT:
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case CAIRO_STATUS_INVALID_VISUAL:
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case CAIRO_STATUS_READ_ERROR:
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case CAIRO_STATUS_WRITE_ERROR:
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case CAIRO_STATUS_FILE_NOT_FOUND:
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case CAIRO_STATUS_TEMP_FILE_ERROR:
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case CAIRO_STATUS_INVALID_STRIDE:
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case CAIRO_STATUS_INVALID_SIZE:
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case CAIRO_STATUS_DEVICE_TYPE_MISMATCH:
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case CAIRO_STATUS_DEVICE_ERROR:
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case CAIRO_STATUS_INVALID_RESTORE:
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case CAIRO_STATUS_INVALID_POP_GROUP:
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case CAIRO_STATUS_NO_CURRENT_POINT:
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case CAIRO_STATUS_INVALID_MATRIX:
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case CAIRO_STATUS_NULL_POINTER:
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case CAIRO_STATUS_INVALID_STRING:
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case CAIRO_STATUS_INVALID_PATH_DATA:
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case CAIRO_STATUS_SURFACE_FINISHED:
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case CAIRO_STATUS_PATTERN_TYPE_MISMATCH:
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case CAIRO_STATUS_INVALID_DASH:
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case CAIRO_STATUS_INVALID_DSC_COMMENT:
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case CAIRO_STATUS_INVALID_INDEX:
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case CAIRO_STATUS_CLIP_NOT_REPRESENTABLE:
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case CAIRO_STATUS_FONT_TYPE_MISMATCH:
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case CAIRO_STATUS_USER_FONT_IMMUTABLE:
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case CAIRO_STATUS_USER_FONT_ERROR:
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case CAIRO_STATUS_NEGATIVE_COUNT:
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case CAIRO_STATUS_INVALID_CLUSTERS:
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case CAIRO_STATUS_INVALID_SLANT:
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case CAIRO_STATUS_INVALID_WEIGHT:
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case CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED:
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default:
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_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
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return (cairo_region_t *) &_cairo_region_nil;
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}
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}
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/**
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* _cairo_region_set_error:
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* @region: a region
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* @status: a status value indicating an error
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*
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* Atomically sets region->status to @status and calls _cairo_error;
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* Does nothing if status is %CAIRO_STATUS_SUCCESS or any of the internal
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* status values.
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*
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* All assignments of an error status to region->status should happen
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* through _cairo_region_set_error(). Note that due to the nature of
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* the atomic operation, it is not safe to call this function on the
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* nil objects.
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*
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* The purpose of this function is to allow the user to set a
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* breakpoint in _cairo_error() to generate a stack trace for when the
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* user causes cairo to detect an error.
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*
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* Return value: the error status.
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**/
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static cairo_status_t
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_cairo_region_set_error (cairo_region_t *region,
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cairo_status_t status)
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{
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if (! _cairo_status_is_error (status))
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return status;
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/* Don't overwrite an existing error. This preserves the first
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* error, which is the most significant. */
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_cairo_status_set_error (®ion->status, status);
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return _cairo_error (status);
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}
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void
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_cairo_region_init (cairo_region_t *region)
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{
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VG (VALGRIND_MAKE_MEM_UNDEFINED (region, sizeof (cairo_region_t)));
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region->status = CAIRO_STATUS_SUCCESS;
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CAIRO_REFERENCE_COUNT_INIT (®ion->ref_count, 0);
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pixman_region32_init (®ion->rgn);
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}
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void
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_cairo_region_init_rectangle (cairo_region_t *region,
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const cairo_rectangle_int_t *rectangle)
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{
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VG (VALGRIND_MAKE_MEM_UNDEFINED (region, sizeof (cairo_region_t)));
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region->status = CAIRO_STATUS_SUCCESS;
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CAIRO_REFERENCE_COUNT_INIT (®ion->ref_count, 0);
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pixman_region32_init_rect (®ion->rgn,
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rectangle->x, rectangle->y,
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rectangle->width, rectangle->height);
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}
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void
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_cairo_region_fini (cairo_region_t *region)
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{
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assert (! CAIRO_REFERENCE_COUNT_HAS_REFERENCE (®ion->ref_count));
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pixman_region32_fini (®ion->rgn);
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VG (VALGRIND_MAKE_MEM_NOACCESS (region, sizeof (cairo_region_t)));
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}
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/**
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* cairo_region_create:
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*
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* Allocates a new empty region object.
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*
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* Return value: A newly allocated #cairo_region_t. Free with
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* cairo_region_destroy(). This function always returns a
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* valid pointer; if memory cannot be allocated, then a special
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* error object is returned where all operations on the object do nothing.
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* You can check for this with cairo_region_status().
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*
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* Since: 1.10
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**/
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cairo_region_t *
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cairo_region_create (void)
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{
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cairo_region_t *region;
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region = _cairo_malloc (sizeof (cairo_region_t));
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if (region == NULL)
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return (cairo_region_t *) &_cairo_region_nil;
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region->status = CAIRO_STATUS_SUCCESS;
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CAIRO_REFERENCE_COUNT_INIT (®ion->ref_count, 1);
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pixman_region32_init (®ion->rgn);
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return region;
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}
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slim_hidden_def (cairo_region_create);
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/**
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* cairo_region_create_rectangles:
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* @rects: an array of @count rectangles
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* @count: number of rectangles
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*
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* Allocates a new region object containing the union of all given @rects.
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*
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* Return value: A newly allocated #cairo_region_t. Free with
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* cairo_region_destroy(). This function always returns a
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* valid pointer; if memory cannot be allocated, then a special
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* error object is returned where all operations on the object do nothing.
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* You can check for this with cairo_region_status().
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*
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* Since: 1.10
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**/
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cairo_region_t *
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cairo_region_create_rectangles (const cairo_rectangle_int_t *rects,
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int count)
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{
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pixman_box32_t stack_pboxes[CAIRO_STACK_ARRAY_LENGTH (pixman_box32_t)];
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pixman_box32_t *pboxes = stack_pboxes;
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cairo_region_t *region;
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int i;
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region = _cairo_malloc (sizeof (cairo_region_t));
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if (unlikely (region == NULL))
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return _cairo_region_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
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if (count > ARRAY_LENGTH (stack_pboxes)) {
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pboxes = _cairo_malloc_ab (count, sizeof (pixman_box32_t));
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if (unlikely (pboxes == NULL)) {
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free (region);
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return _cairo_region_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
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}
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}
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for (i = 0; i < count; i++) {
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pboxes[i].x1 = rects[i].x;
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pboxes[i].y1 = rects[i].y;
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pboxes[i].x2 = rects[i].x + rects[i].width;
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pboxes[i].y2 = rects[i].y + rects[i].height;
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}
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i = pixman_region32_init_rects (®ion->rgn, pboxes, count);
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if (pboxes != stack_pboxes)
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free (pboxes);
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if (unlikely (i == 0)) {
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free (region);
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return _cairo_region_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
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}
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CAIRO_REFERENCE_COUNT_INIT (®ion->ref_count, 1);
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region->status = CAIRO_STATUS_SUCCESS;
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return region;
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}
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slim_hidden_def (cairo_region_create_rectangles);
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/**
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* cairo_region_create_rectangle:
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* @rectangle: a #cairo_rectangle_int_t
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*
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* Allocates a new region object containing @rectangle.
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*
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* Return value: A newly allocated #cairo_region_t. Free with
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* cairo_region_destroy(). This function always returns a
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* valid pointer; if memory cannot be allocated, then a special
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* error object is returned where all operations on the object do nothing.
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* You can check for this with cairo_region_status().
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*
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* Since: 1.10
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**/
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cairo_region_t *
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cairo_region_create_rectangle (const cairo_rectangle_int_t *rectangle)
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{
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cairo_region_t *region;
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region = _cairo_malloc (sizeof (cairo_region_t));
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if (unlikely (region == NULL))
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return (cairo_region_t *) &_cairo_region_nil;
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region->status = CAIRO_STATUS_SUCCESS;
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CAIRO_REFERENCE_COUNT_INIT (®ion->ref_count, 1);
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pixman_region32_init_rect (®ion->rgn,
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rectangle->x, rectangle->y,
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rectangle->width, rectangle->height);
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return region;
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}
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slim_hidden_def (cairo_region_create_rectangle);
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/**
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* cairo_region_copy:
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* @original: a #cairo_region_t
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*
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* Allocates a new region object copying the area from @original.
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*
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* Return value: A newly allocated #cairo_region_t. Free with
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* cairo_region_destroy(). This function always returns a
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* valid pointer; if memory cannot be allocated, then a special
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* error object is returned where all operations on the object do nothing.
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* You can check for this with cairo_region_status().
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*
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* Since: 1.10
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**/
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cairo_region_t *
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cairo_region_copy (const cairo_region_t *original)
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{
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cairo_region_t *copy;
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if (original != NULL && original->status)
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return (cairo_region_t *) &_cairo_region_nil;
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copy = cairo_region_create ();
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if (unlikely (copy->status))
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return copy;
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if (original != NULL &&
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! pixman_region32_copy (©->rgn, CONST_CAST &original->rgn))
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{
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cairo_region_destroy (copy);
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return (cairo_region_t *) &_cairo_region_nil;
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}
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return copy;
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}
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slim_hidden_def (cairo_region_copy);
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/**
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* cairo_region_reference:
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* @region: a #cairo_region_t
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*
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* Increases the reference count on @region by one. This prevents
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* @region from being destroyed until a matching call to
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* cairo_region_destroy() is made.
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*
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* Return value: the referenced #cairo_region_t.
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*
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* Since: 1.10
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**/
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cairo_region_t *
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cairo_region_reference (cairo_region_t *region)
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{
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if (region == NULL || CAIRO_REFERENCE_COUNT_IS_INVALID (®ion->ref_count))
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return NULL;
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assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (®ion->ref_count));
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_cairo_reference_count_inc (®ion->ref_count);
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return region;
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}
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slim_hidden_def (cairo_region_reference);
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/**
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* cairo_region_destroy:
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* @region: a #cairo_region_t
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*
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* Destroys a #cairo_region_t object created with
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* cairo_region_create(), cairo_region_copy(), or
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* or cairo_region_create_rectangle().
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*
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* Since: 1.10
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**/
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void
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cairo_region_destroy (cairo_region_t *region)
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{
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if (region == NULL || CAIRO_REFERENCE_COUNT_IS_INVALID (®ion->ref_count))
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return;
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assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (®ion->ref_count));
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if (! _cairo_reference_count_dec_and_test (®ion->ref_count))
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return;
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_cairo_region_fini (region);
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free (region);
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}
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slim_hidden_def (cairo_region_destroy);
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/**
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* cairo_region_num_rectangles:
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* @region: a #cairo_region_t
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*
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* Returns the number of rectangles contained in @region.
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*
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* Return value: The number of rectangles contained in @region.
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*
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* Since: 1.10
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**/
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int
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cairo_region_num_rectangles (const cairo_region_t *region)
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{
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if (region->status)
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return 0;
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return pixman_region32_n_rects (CONST_CAST ®ion->rgn);
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}
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slim_hidden_def (cairo_region_num_rectangles);
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/**
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* cairo_region_get_rectangle:
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* @region: a #cairo_region_t
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* @nth: a number indicating which rectangle should be returned
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* @rectangle: return location for a #cairo_rectangle_int_t
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*
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* Stores the @nth rectangle from the region in @rectangle.
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*
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* Since: 1.10
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**/
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void
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cairo_region_get_rectangle (const cairo_region_t *region,
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int nth,
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cairo_rectangle_int_t *rectangle)
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{
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pixman_box32_t *pbox;
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if (region->status) {
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rectangle->x = rectangle->y = 0;
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rectangle->width = rectangle->height = 0;
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return;
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}
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pbox = pixman_region32_rectangles (CONST_CAST ®ion->rgn, NULL) + nth;
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rectangle->x = pbox->x1;
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rectangle->y = pbox->y1;
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rectangle->width = pbox->x2 - pbox->x1;
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rectangle->height = pbox->y2 - pbox->y1;
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}
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slim_hidden_def (cairo_region_get_rectangle);
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/**
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* cairo_region_get_extents:
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* @region: a #cairo_region_t
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* @extents: rectangle into which to store the extents
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*
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* Gets the bounding rectangle of @region as a #cairo_rectangle_int_t
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*
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* Since: 1.10
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**/
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void
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cairo_region_get_extents (const cairo_region_t *region,
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cairo_rectangle_int_t *extents)
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{
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pixman_box32_t *pextents;
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if (region->status) {
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extents->x = extents->y = 0;
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extents->width = extents->height = 0;
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return;
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}
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pextents = pixman_region32_extents (CONST_CAST ®ion->rgn);
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extents->x = pextents->x1;
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extents->y = pextents->y1;
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extents->width = pextents->x2 - pextents->x1;
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extents->height = pextents->y2 - pextents->y1;
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}
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slim_hidden_def (cairo_region_get_extents);
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/**
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* cairo_region_status:
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* @region: a #cairo_region_t
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*
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* Checks whether an error has previous occured for this
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* region object.
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*
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* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
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*
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* Since: 1.10
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**/
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cairo_status_t
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cairo_region_status (const cairo_region_t *region)
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{
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return region->status;
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}
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slim_hidden_def (cairo_region_status);
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/**
|
|
* cairo_region_subtract:
|
|
* @dst: a #cairo_region_t
|
|
* @other: another #cairo_region_t
|
|
*
|
|
* Subtracts @other from @dst and places the result in @dst
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_subtract (cairo_region_t *dst, const cairo_region_t *other)
|
|
{
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
if (other->status)
|
|
return _cairo_region_set_error (dst, other->status);
|
|
|
|
if (! pixman_region32_subtract (&dst->rgn,
|
|
&dst->rgn,
|
|
CONST_CAST &other->rgn))
|
|
{
|
|
return _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
}
|
|
|
|
return CAIRO_STATUS_SUCCESS;
|
|
}
|
|
slim_hidden_def (cairo_region_subtract);
|
|
|
|
/**
|
|
* cairo_region_subtract_rectangle:
|
|
* @dst: a #cairo_region_t
|
|
* @rectangle: a #cairo_rectangle_int_t
|
|
*
|
|
* Subtracts @rectangle from @dst and places the result in @dst
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_subtract_rectangle (cairo_region_t *dst,
|
|
const cairo_rectangle_int_t *rectangle)
|
|
{
|
|
cairo_status_t status = CAIRO_STATUS_SUCCESS;
|
|
pixman_region32_t region;
|
|
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
pixman_region32_init_rect (®ion,
|
|
rectangle->x, rectangle->y,
|
|
rectangle->width, rectangle->height);
|
|
|
|
if (! pixman_region32_subtract (&dst->rgn, &dst->rgn, ®ion))
|
|
status = _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
pixman_region32_fini (®ion);
|
|
|
|
return status;
|
|
}
|
|
slim_hidden_def (cairo_region_subtract_rectangle);
|
|
|
|
/**
|
|
* cairo_region_intersect:
|
|
* @dst: a #cairo_region_t
|
|
* @other: another #cairo_region_t
|
|
*
|
|
* Computes the intersection of @dst with @other and places the result in @dst
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_intersect (cairo_region_t *dst, const cairo_region_t *other)
|
|
{
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
if (other->status)
|
|
return _cairo_region_set_error (dst, other->status);
|
|
|
|
if (! pixman_region32_intersect (&dst->rgn, &dst->rgn, CONST_CAST &other->rgn))
|
|
return _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
return CAIRO_STATUS_SUCCESS;
|
|
}
|
|
slim_hidden_def (cairo_region_intersect);
|
|
|
|
/**
|
|
* cairo_region_intersect_rectangle:
|
|
* @dst: a #cairo_region_t
|
|
* @rectangle: a #cairo_rectangle_int_t
|
|
*
|
|
* Computes the intersection of @dst with @rectangle and places the
|
|
* result in @dst
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_intersect_rectangle (cairo_region_t *dst,
|
|
const cairo_rectangle_int_t *rectangle)
|
|
{
|
|
cairo_status_t status = CAIRO_STATUS_SUCCESS;
|
|
pixman_region32_t region;
|
|
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
pixman_region32_init_rect (®ion,
|
|
rectangle->x, rectangle->y,
|
|
rectangle->width, rectangle->height);
|
|
|
|
if (! pixman_region32_intersect (&dst->rgn, &dst->rgn, ®ion))
|
|
status = _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
pixman_region32_fini (®ion);
|
|
|
|
return status;
|
|
}
|
|
slim_hidden_def (cairo_region_intersect_rectangle);
|
|
|
|
/**
|
|
* cairo_region_union:
|
|
* @dst: a #cairo_region_t
|
|
* @other: another #cairo_region_t
|
|
*
|
|
* Computes the union of @dst with @other and places the result in @dst
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_union (cairo_region_t *dst,
|
|
const cairo_region_t *other)
|
|
{
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
if (other->status)
|
|
return _cairo_region_set_error (dst, other->status);
|
|
|
|
if (! pixman_region32_union (&dst->rgn, &dst->rgn, CONST_CAST &other->rgn))
|
|
return _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
return CAIRO_STATUS_SUCCESS;
|
|
}
|
|
slim_hidden_def (cairo_region_union);
|
|
|
|
/**
|
|
* cairo_region_union_rectangle:
|
|
* @dst: a #cairo_region_t
|
|
* @rectangle: a #cairo_rectangle_int_t
|
|
*
|
|
* Computes the union of @dst with @rectangle and places the result in @dst.
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_union_rectangle (cairo_region_t *dst,
|
|
const cairo_rectangle_int_t *rectangle)
|
|
{
|
|
cairo_status_t status = CAIRO_STATUS_SUCCESS;
|
|
pixman_region32_t region;
|
|
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
pixman_region32_init_rect (®ion,
|
|
rectangle->x, rectangle->y,
|
|
rectangle->width, rectangle->height);
|
|
|
|
if (! pixman_region32_union (&dst->rgn, &dst->rgn, ®ion))
|
|
status = _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
pixman_region32_fini (®ion);
|
|
|
|
return status;
|
|
}
|
|
slim_hidden_def (cairo_region_union_rectangle);
|
|
|
|
/**
|
|
* cairo_region_xor:
|
|
* @dst: a #cairo_region_t
|
|
* @other: another #cairo_region_t
|
|
*
|
|
* Computes the exclusive difference of @dst with @other and places the
|
|
* result in @dst. That is, @dst will be set to contain all areas that
|
|
* are either in @dst or in @other, but not in both.
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_xor (cairo_region_t *dst, const cairo_region_t *other)
|
|
{
|
|
cairo_status_t status = CAIRO_STATUS_SUCCESS;
|
|
pixman_region32_t tmp;
|
|
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
if (other->status)
|
|
return _cairo_region_set_error (dst, other->status);
|
|
|
|
pixman_region32_init (&tmp);
|
|
|
|
/* XXX: get an xor function into pixman */
|
|
if (! pixman_region32_subtract (&tmp, CONST_CAST &other->rgn, &dst->rgn) ||
|
|
! pixman_region32_subtract (&dst->rgn, &dst->rgn, CONST_CAST &other->rgn) ||
|
|
! pixman_region32_union (&dst->rgn, &dst->rgn, &tmp))
|
|
status = _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
pixman_region32_fini (&tmp);
|
|
|
|
return status;
|
|
}
|
|
slim_hidden_def (cairo_region_xor);
|
|
|
|
/**
|
|
* cairo_region_xor_rectangle:
|
|
* @dst: a #cairo_region_t
|
|
* @rectangle: a #cairo_rectangle_int_t
|
|
*
|
|
* Computes the exclusive difference of @dst with @rectangle and places the
|
|
* result in @dst. That is, @dst will be set to contain all areas that are
|
|
* either in @dst or in @rectangle, but not in both.
|
|
*
|
|
* Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_status_t
|
|
cairo_region_xor_rectangle (cairo_region_t *dst,
|
|
const cairo_rectangle_int_t *rectangle)
|
|
{
|
|
cairo_status_t status = CAIRO_STATUS_SUCCESS;
|
|
pixman_region32_t region, tmp;
|
|
|
|
if (dst->status)
|
|
return dst->status;
|
|
|
|
pixman_region32_init_rect (®ion,
|
|
rectangle->x, rectangle->y,
|
|
rectangle->width, rectangle->height);
|
|
pixman_region32_init (&tmp);
|
|
|
|
/* XXX: get an xor function into pixman */
|
|
if (! pixman_region32_subtract (&tmp, ®ion, &dst->rgn) ||
|
|
! pixman_region32_subtract (&dst->rgn, &dst->rgn, ®ion) ||
|
|
! pixman_region32_union (&dst->rgn, &dst->rgn, &tmp))
|
|
status = _cairo_region_set_error (dst, CAIRO_STATUS_NO_MEMORY);
|
|
|
|
pixman_region32_fini (&tmp);
|
|
pixman_region32_fini (®ion);
|
|
|
|
return status;
|
|
}
|
|
slim_hidden_def (cairo_region_xor_rectangle);
|
|
|
|
/**
|
|
* cairo_region_is_empty:
|
|
* @region: a #cairo_region_t
|
|
*
|
|
* Checks whether @region is empty.
|
|
*
|
|
* Return value: %TRUE if @region is empty, %FALSE if it isn't.
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_bool_t
|
|
cairo_region_is_empty (const cairo_region_t *region)
|
|
{
|
|
if (region->status)
|
|
return TRUE;
|
|
|
|
return ! pixman_region32_not_empty (CONST_CAST ®ion->rgn);
|
|
}
|
|
slim_hidden_def (cairo_region_is_empty);
|
|
|
|
/**
|
|
* cairo_region_translate:
|
|
* @region: a #cairo_region_t
|
|
* @dx: Amount to translate in the x direction
|
|
* @dy: Amount to translate in the y direction
|
|
*
|
|
* Translates @region by (@dx, @dy).
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
void
|
|
cairo_region_translate (cairo_region_t *region,
|
|
int dx, int dy)
|
|
{
|
|
if (region->status)
|
|
return;
|
|
|
|
pixman_region32_translate (®ion->rgn, dx, dy);
|
|
}
|
|
slim_hidden_def (cairo_region_translate);
|
|
|
|
/**
|
|
* cairo_region_overlap_t:
|
|
* @CAIRO_REGION_OVERLAP_IN: The contents are entirely inside the region
|
|
* @CAIRO_REGION_OVERLAP_OUT: The contents are entirely outside the region
|
|
* @CAIRO_REGION_OVERLAP_PART: The contents are partially inside and
|
|
* partially outside the region.
|
|
*
|
|
* Used as the return value for cairo_region_contains_rectangle().
|
|
*/
|
|
|
|
/**
|
|
* cairo_region_contains_rectangle:
|
|
* @region: a #cairo_region_t
|
|
* @rectangle: a #cairo_rectangle_int_t
|
|
*
|
|
* Checks whether @rectangle is inside, outside or partially contained
|
|
* in @region
|
|
*
|
|
* Return value:
|
|
* %CAIRO_REGION_OVERLAP_IN if @rectangle is entirely inside @region,
|
|
* %CAIRO_REGION_OVERLAP_OUT if @rectangle is entirely outside @region, or
|
|
* %CAIRO_REGION_OVERLAP_PART if @rectangle is partially inside and partially outside @region.
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_region_overlap_t
|
|
cairo_region_contains_rectangle (const cairo_region_t *region,
|
|
const cairo_rectangle_int_t *rectangle)
|
|
{
|
|
pixman_box32_t pbox;
|
|
pixman_region_overlap_t poverlap;
|
|
|
|
if (region->status)
|
|
return CAIRO_REGION_OVERLAP_OUT;
|
|
|
|
pbox.x1 = rectangle->x;
|
|
pbox.y1 = rectangle->y;
|
|
pbox.x2 = rectangle->x + rectangle->width;
|
|
pbox.y2 = rectangle->y + rectangle->height;
|
|
|
|
poverlap = pixman_region32_contains_rectangle (CONST_CAST ®ion->rgn,
|
|
&pbox);
|
|
switch (poverlap) {
|
|
default:
|
|
case PIXMAN_REGION_OUT: return CAIRO_REGION_OVERLAP_OUT;
|
|
case PIXMAN_REGION_IN: return CAIRO_REGION_OVERLAP_IN;
|
|
case PIXMAN_REGION_PART: return CAIRO_REGION_OVERLAP_PART;
|
|
}
|
|
}
|
|
slim_hidden_def (cairo_region_contains_rectangle);
|
|
|
|
/**
|
|
* cairo_region_contains_point:
|
|
* @region: a #cairo_region_t
|
|
* @x: the x coordinate of a point
|
|
* @y: the y coordinate of a point
|
|
*
|
|
* Checks whether (@x, @y) is contained in @region.
|
|
*
|
|
* Return value: %TRUE if (@x, @y) is contained in @region, %FALSE if it is not.
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_bool_t
|
|
cairo_region_contains_point (const cairo_region_t *region,
|
|
int x, int y)
|
|
{
|
|
pixman_box32_t box;
|
|
|
|
if (region->status)
|
|
return FALSE;
|
|
|
|
return pixman_region32_contains_point (CONST_CAST ®ion->rgn, x, y, &box);
|
|
}
|
|
slim_hidden_def (cairo_region_contains_point);
|
|
|
|
/**
|
|
* cairo_region_equal:
|
|
* @a: a #cairo_region_t or %NULL
|
|
* @b: a #cairo_region_t or %NULL
|
|
*
|
|
* Compares whether region_a is equivalent to region_b. %NULL as an argument
|
|
* is equal to itself, but not to any non-%NULL region.
|
|
*
|
|
* Return value: %TRUE if both regions contained the same coverage,
|
|
* %FALSE if it is not or any region is in an error status.
|
|
*
|
|
* Since: 1.10
|
|
**/
|
|
cairo_bool_t
|
|
cairo_region_equal (const cairo_region_t *a,
|
|
const cairo_region_t *b)
|
|
{
|
|
/* error objects are never equal */
|
|
if ((a != NULL && a->status) || (b != NULL && b->status))
|
|
return FALSE;
|
|
|
|
if (a == b)
|
|
return TRUE;
|
|
|
|
if (a == NULL || b == NULL)
|
|
return FALSE;
|
|
|
|
return pixman_region32_equal (CONST_CAST &a->rgn, CONST_CAST &b->rgn);
|
|
}
|
|
slim_hidden_def (cairo_region_equal);
|