File: gxcindex.h

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/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gxcindex.h 8022 2007-06-05 22:23:38Z giles $ */
/* Define the device color index type and macros */

#ifndef gxcindex_INCLUDED
#  define gxcindex_INCLUDED

#include "gsbitops.h"		/* for sample_store macros */

/*
 * Define the maximum number of components in a device color.
 * The minimum value is 4, to handle CMYK; the maximum value is
 * arch_sizeof_color_index * 8, since for larger values, there aren't enough
 * bits in a gx_color_index to have even 1 bit per component.
 */
#define GX_DEVICE_COLOR_MAX_COMPONENTS (ARCH_SIZEOF_GX_COLOR_INDEX * 8)

/*
 * We might change gx_color_index to a pointer or a structure in the
 * future.  These disabled options help us assess how much disruption
 * such a change might cause.
 */
/*#define TEST_CINDEX_POINTER*/
/*#define TEST_CINDEX_STRUCT*/

/*
 * Internally, a (pure) device color is represented by opaque values of
 * type gx_color_index, which are tied to the specific device.  The driver
 * maps between these values and RGB[alpha] or CMYK values.  In this way,
 * the driver can convert RGB values to its most natural color representation,
 * and have the graphics library cache the result.
 */

#ifdef TEST_CINDEX_STRUCT

/* Define the type for device color index (pixel value) data. */
typedef struct { ulong value[2]; } gx_color_index_data;

#else  /* !TEST_CINDEX_STRUCT */

/* Define the type for device color index (pixel value) data. */
#ifdef GX_COLOR_INDEX_TYPE
typedef GX_COLOR_INDEX_TYPE gx_color_index_data;
#else
/* this default must be kept in sync with the one in genarch.c
   or ARCH_SIZEOF_GX_COLOR_INDEX will be incorrect */
typedef ulong gx_color_index_data;
#endif

#endif /* (!)TEST_CINDEX_STRUCT */

#ifdef TEST_CINDEX_POINTER

/* Define the type for device color indices (pixel values). */
typedef gx_color_index_data * gx_color_index;
#define arch_sizeof_color_index arch_sizeof_ptr

extern const gx_color_index_data gx_no_color_index_data;
#define gx_no_color_index_values (&gx_no_color_index_data)
#define gx_no_color_index (&gx_no_color_index_data)

#else  /* !TEST_CINDEX_POINTER */

#define arch_sizeof_color_index sizeof(gx_color_index_data)

/* Define the type for device color indices (pixel values). */
typedef gx_color_index_data gx_color_index;

/*
 * Define the 'transparent' or 'undefined' color index.
 */
#define gx_no_color_index_value (~0)	/* no cast -> can be used in #if */
/*
 * There was a comment here about the SGI C compiler provided with Irix 5.2
 * giving error messages.  I hope that was fixed when the value of gx_no_color_index
 * was changed from (-1) to (~0).  If not then let us know.
 */
#define gx_no_color_index ((gx_color_index)gx_no_color_index_value)

#endif /* (!)TEST_CINDEX_POINTER */

/*
 * Define macros for accumulating a scan line of a colored image.
 * The usage is as follows:
 *	DECLARE_LINE_ACCUM(line, bpp, xo);
 *	for ( x = xo; x < xe; ++x ) {
 *	    << compute color at x >>
 *          LINE_ACCUM(color, bpp);
 *      }
 * This code must be enclosed in { }, since DECLARE_LINE_ACCUM declares
 * variables.  Supported values of bpp are 1, 2, 4, or n * 8, where n <= 8.
 *
 * Note that DECLARE_LINE_ACCUM declares the variables l_dptr, l_dbyte, and
 * l_dbit.  Other code in the loop may use these variables.
 */
#define DECLARE_LINE_ACCUM(line, bpp, xo)\
	sample_store_declare_setup(l_dptr, l_dbit, l_dbyte, line, 0, bpp)
#define LINE_ACCUM(color, bpp)\
	sample_store_next_any(color, l_dptr, l_dbit, bpp, l_dbyte)
#define LINE_ACCUM_SKIP(bpp)\
	sample_store_skip_next(l_dptr, l_dbit, bpp, l_dbyte)
#define LINE_ACCUM_STORE(bpp)\
	sample_store_flush(l_dptr, l_dbit, bpp, l_dbyte)
/*
 * Declare additional macros for accumulating a scan line with copying
 * to a device.  Note that DECLARE_LINE_ACCUM_COPY also declares l_xprev.
 * LINE_ACCUM_COPY is called after the accumulation loop.
 */
#define DECLARE_LINE_ACCUM_COPY(line, bpp, xo)\
	DECLARE_LINE_ACCUM(line, bpp, xo);\
	int l_xprev = (xo)
#define LINE_ACCUM_COPY(dev, line, bpp, xo, xe, raster, y)\
	if ( (xe) > l_xprev ) {\
	    int code;\
	    LINE_ACCUM_STORE(bpp);\
	    code = (*dev_proc(dev, copy_color))\
	      (dev, line, l_xprev - (xo), raster,\
	       gx_no_bitmap_id, l_xprev, y, (xe) - l_xprev, 1);\
	    if ( code < 0 )\
	      return code;\
	}

#endif /* gxcindex_INCLUDED */