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/* Copyright (C) 1997 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gscompt.h,v 1.5 2002/06/16 08:45:42 lpd Exp $ */
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/* Abstract types for compositing objects */
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#ifndef gscompt_INCLUDED
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# define gscompt_INCLUDED
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/*
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* Compositing is the next-to-last step in the rendering pipeline.
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* It occurs after color correction but before halftoning (if needed).
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*
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* gs_composite_t is the abstract superclass for compositing functions such
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* as RasterOp functions or alpha-based compositing. Concrete subclasses
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* must provide a default implementation (presumably based on
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* get_bits_rectangle and copy_color) for devices that provide no optimized
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* implementation of their own.
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*
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* A client that wants to produce composited output asks the target device
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* to create an appropriate compositing device based on the target device
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* and the gs_composite_t (and possibly other elements of the imager state).
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* If the target device doesn't have its own implementation for the
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* requested function, format, and state, it passes the buck to the
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* gs_composite_t, which may make further tests for special cases before
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* creating and returning a compositing device that uses the default
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* implementation.
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*/
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typedef struct gs_composite_s gs_composite_t;
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/*
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* To enable fast cache lookup and equality testing, compositing functions,
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* like halftones, black generation functions, etc., carry a unique ID (time
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* stamp).
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*/
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gs_id gs_composite_id(const gs_composite_t * pcte);
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#endif /* gscompt_INCLUDED */
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