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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@37167 72102866-910b-0410-8b05-ffd578937521
82 lines
2.6 KiB
Objective-C
82 lines
2.6 KiB
Objective-C
/*
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OpalGState.h
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Copyright (C) 2013 Free Software Foundation, Inc.
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Author: Ivan Vucica <ivan@vucica.net>
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Date: June 2013
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This file is part of GNUstep.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; see the file COPYING.LIB.
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If not, see <http://www.gnu.org/licenses/> or write to the
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Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#import <CoreGraphics/CoreGraphics.h>
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#import "gsc/GSGState.h"
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@class OpalSurface;
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@interface OpalGState : GSGState
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{
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OpalSurface * _opalSurface;
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/** When a surface's gstate is being switched away from,
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we store the current gstate in _opGState.
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When a surface's gstate is being switched back to,
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if _opGState is not nil, we apply the stored gstate.
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To facilitate OpalGState class instance copying, we
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also store a copy of the gstate inside _opGState when
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gstate's -copyWithZone: is being run. This is because
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the same _opalSurface should be used in both new and
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old OpalGState.
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The same is done in Cairo backend, with one key
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difference: since all graphics state operations in
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Cairo are done directly on cairo_t and are unrelated
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to the surface, Opal mixes the concepts of a gstate
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and a surface into a context. Hence, when gstate is
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switched, it's OpalContext's duty to apply the stored
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copy of a gstate from _opGState. No such trickery
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is needed with Cairo, as Cairo backend can simply
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have a different cairo_t with the same surface.
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**/
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OPGStateRef _opGState;
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}
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@end
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@interface OpalGState (InitializationMethods)
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- (void) DPSinitgraphics;
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- (void) GSSetSurface: (OpalSurface *)opalSurface
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: (int)x
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: (int)y;
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- (void) GSCurrentSurface: (OpalSurface **)surface
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: (int *)x
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: (int *)y;
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@end
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@interface OpalGState (Accessors)
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- (CGContextRef) CGContext;
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- (OPGStateRef) OPGState;
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- (void) setOPGState: (OPGStateRef) opGState;
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@end
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@interface OpalGState (NonrequiredMethods)
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- (void) DPSgsave;
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- (void) DPSgrestore;
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@end
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