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80b8deb1e4
This patch was produced with the following (GNU) sed script: sed -i -r -e 's/^[ \t]+$//' run on all *.[ch] files within cairo.
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2006 Keith Packard
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* Copyright © 2006 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 University of Southern
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* California.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@cworth.org>
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* Keith Packard <keithp@keithp.com>
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*/
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#include "cairoint.h"
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/* The analysis here assumes destination alpha semantics (that is
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* CAIRO_CONTENT_COLOR_ALPHA). More things can be considered opaque
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* otherwise (CAIRO_CONTENT_COLOR) so we'll probably want to add a
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* cairo_content_t parameter to this function
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*
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* We also need a definition of what "opaque" means. Is it, "does not
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* requiring 'knowing' the original contents of destination, nor does
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* it set the destination alpha to anything but 1.0" ?
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*/
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cairo_bool_t
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_cairo_operator_always_opaque (cairo_operator_t op)
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{
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switch (op) {
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case CAIRO_OPERATOR_CLEAR:
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return FALSE;
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case CAIRO_OPERATOR_SOURCE:
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return FALSE;
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case CAIRO_OPERATOR_OVER:
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case CAIRO_OPERATOR_IN:
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case CAIRO_OPERATOR_OUT:
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case CAIRO_OPERATOR_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_DEST:
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return TRUE;
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case CAIRO_OPERATOR_DEST_OVER:
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case CAIRO_OPERATOR_DEST_IN:
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case CAIRO_OPERATOR_DEST_OUT:
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case CAIRO_OPERATOR_DEST_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_XOR:
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case CAIRO_OPERATOR_ADD:
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case CAIRO_OPERATOR_SATURATE:
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return FALSE;
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}
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return FALSE;
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}
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/* As above, we'll probably want to add a cairo_content_t parameter to
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* this function
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*
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* We also need a definition of what "translucent" means.
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*/
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cairo_bool_t
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_cairo_operator_always_translucent (cairo_operator_t op)
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{
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switch (op) {
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case CAIRO_OPERATOR_CLEAR:
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return TRUE;
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case CAIRO_OPERATOR_SOURCE:
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return FALSE;
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case CAIRO_OPERATOR_OVER:
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case CAIRO_OPERATOR_IN:
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case CAIRO_OPERATOR_OUT:
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case CAIRO_OPERATOR_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_DEST:
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return FALSE;
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case CAIRO_OPERATOR_DEST_OVER:
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case CAIRO_OPERATOR_DEST_IN:
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case CAIRO_OPERATOR_DEST_OUT:
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case CAIRO_OPERATOR_DEST_ATOP:
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return FALSE;
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case CAIRO_OPERATOR_XOR:
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case CAIRO_OPERATOR_ADD:
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case CAIRO_OPERATOR_SATURATE:
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return TRUE;
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}
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return TRUE;
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}
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