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/* Copyright (C) 1997, 1998 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: gxgetbit.h,v 1.5 2002/06/16 08:45:43 lpd Exp $ */
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/* Interface for get_bits_rectangle driver procedure */
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#ifndef gxgetbit_INCLUDED
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# define gxgetbit_INCLUDED
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#include "gxbitfmt.h"
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/* The parameter record typedef is also in gxdevcli.h. */
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#ifndef gs_get_bits_params_DEFINED
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# define gs_get_bits_params_DEFINED
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typedef struct gs_get_bits_params_s gs_get_bits_params_t;
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#endif
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/*
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* We define the options for get_bits_rectangle here in a separate file
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* so that the great majority of driver implementors and clients, which
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* don't care about the details, don't need to be recompiled if the set
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* of options changes.
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*/
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typedef gx_bitmap_format_t gs_get_bits_options_t;
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/*
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* Define the parameter record passed to get_bits_rectangle.
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* get_bits_rectangle may update members of this structure if
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* the options allow it to choose their values, and always updates options
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* to indicate what options were actually used (1 option per group).
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*/
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struct gs_get_bits_params_s {
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gs_get_bits_options_t options;
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byte *data[32];
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int x_offset; /* in returned data */
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uint raster;
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};
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/*
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* gx_bitmap_format_t defines the options passed to get_bits_rectangle,
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* which indicate which formats are acceptable for the returned data. If
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* successful, get_bits_rectangle sets the options member of the parameter
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* record to indicate what options were chosen -- 1 per group, and never the
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* _ANY option. Note that the chosen option is not necessarily one that
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* appeared in the original options: for example, if GB_RASTER_ANY is the
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* only raster option originally set, the chosen option will be
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* GB_RASTER_STANDARD or GB_RASTER_SPECIFIED.
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*
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* If the options mask is 0, get_bits_rectangle must set it to the
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* complete set of supported options and return an error. This allows
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* clients to determine what options are supported without actually doing
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* a transfer.
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*
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* All devices must support at least one option in each group, and must
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* support GB_COLORS_NATIVE.
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*
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* NOTE: the current default implementation supports only the following
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* options in their respective groups (i.e., any other options must be
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* supported directly by the device):
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* GB_DEPTH_8
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* GB_PACKING_CHUNKY
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* GB_RETURN_COPY
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* The current default implementation also requires that all devices
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* support GB_PACKING_CHUNKY. */
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/* ---------------- Procedures ---------------- */
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/* Try to implement get_bits_rectangle by returning a pointer. */
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int gx_get_bits_return_pointer(gx_device * dev, int x, int h,
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gs_get_bits_params_t * params,
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const gs_get_bits_params_t *stored,
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byte * stored_base);
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/* Implement get_bits_rectangle by copying. */
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int gx_get_bits_copy(gx_device * dev, int x, int w, int h,
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gs_get_bits_params_t * params,
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const gs_get_bits_params_t *stored,
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const byte * src_base, uint dev_raster);
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#endif /* gxgetbit_INCLUDED */
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