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- /* Copyright (C) 1997, 1998 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- distributor accepts any responsibility for the consequences of using it, or
- for whether it serves any particular purpose or works at all, unless he or
- she says so in writing. Refer to the Aladdin Free Public License (the
- "License") for full details.
-
- Every copy of AFPL Ghostscript must include a copy of the License, normally
- in a plain ASCII text file named PUBLIC. The License grants you the right
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: gxgetbit.h,v 1.2 2000/09/19 19:00:37 lpd Exp $ */
- /* Interface for get_bits_rectangle driver procedure */
-
- #ifndef gxgetbit_INCLUDED
- # define gxgetbit_INCLUDED
-
- #include "gxbitfmt.h"
-
- /* The parameter record typedef is also in gxdevcli.h. */
- #ifndef gs_get_bits_params_DEFINED
- # define gs_get_bits_params_DEFINED
- typedef struct gs_get_bits_params_s gs_get_bits_params_t;
- #endif
-
- /*
- * We define the options for get_bits_rectangle here in a separate file
- * so that the great majority of driver implementors and clients, which
- * don't care about the details, don't need to be recompiled if the set
- * of options changes.
- */
- typedef gx_bitmap_format_t gs_get_bits_options_t;
-
- /*
- * Define the parameter record passed to get_bits_rectangle.
- * get_bits_rectangle may update members of this structure if
- * the options allow it to choose their values, and always updates options
- * to indicate what options were actually used (1 option per group).
- */
- struct gs_get_bits_params_s {
- gs_get_bits_options_t options;
- byte *data[32];
- int x_offset; /* in returned data */
- uint raster;
- };
-
- /*
- * gx_bitmap_format_t defines the options passed to get_bits_rectangle,
- * which indicate which formats are acceptable for the returned data. If
- * successful, get_bits_rectangle sets the options member of the parameter
- * record to indicate what options were chosen -- 1 per group, and never the
- * _ANY option. Note that the chosen option is not necessarily one that
- * appeared in the original options: for example, if GB_RASTER_ANY is the
- * only raster option originally set, the chosen option will be
- * GB_RASTER_STANDARD or GB_RASTER_SPECIFIED.
- *
- * If the options mask is 0, get_bits_rectangle must set it to the
- * complete set of supported options and return an error. This allows
- * clients to determine what options are supported without actually doing
- * a transfer.
- *
- * All devices must support at least one option in each group, and must
- * support GB_COLORS_NATIVE.
- *
- * NOTE: the current default implementation supports only the following
- * options in their respective groups (i.e., any other options must be
- * supported directly by the device):
- * GB_DEPTH_8
- * GB_PACKING_CHUNKY
- * GB_RETURN_COPY
- * The current default implementation also requires that all devices
- * support GB_PACKING_CHUNKY. */
-
- /* ---------------- Procedures ---------------- */
-
- /* Try to implement get_bits_rectangle by returning a pointer. */
- int gx_get_bits_return_pointer(P6(gx_device * dev, int x, int h,
- gs_get_bits_params_t * params,
- const gs_get_bits_params_t *stored,
- byte * stored_base));
-
- /* Implement get_bits_rectangle by copying. */
- int gx_get_bits_copy(P8(gx_device * dev, int x, int w, int h,
- gs_get_bits_params_t * params,
- const gs_get_bits_params_t *stored,
- const byte * src_base, uint dev_raster));
-
- #endif /* gxgetbit_INCLUDED */
-