harvey/sys/src/cmd/gs/src/gdevdcrd.c

/* Copyright (C) 1999 Aladdin Enterprises.  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 the license contained in the file LICENSE in this distribution.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: gdevdcrd.c,v 1.6 2004/08/04 19:36:12 stefan Exp $ */
/* Create a sample device CRD */
#include "math_.h"
#include "memory_.h"
#include "string_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsparam.h"
#include "gscspace.h"		/* for gscie.h */
#include "gscrd.h"
#include "gscrdp.h"
#include "gxdevcli.h"
#include "gdevdcrd.h"

/*
 * The parameters in this driver CRD are the default PostScript values,
 * except for the optional 'dented' procedures.
 */
#define DENT(v, f)\
  (v <= 0.5 ? v * f : (v - 0.5) * (1 - (0.5 * f)) / 0.5 + 0.5 * f)
private const gs_vector3 bit_WhitePoint = {(float)0.9505, 1, (float)1.0890};
private const gs_range3 bit_RangePQR = {
    {{0, (float)0.9505}, {0, 1}, {0, (float)1.0890}}
};
private const float dent_PQR = 1.0;
private int
bit_TransformPQR_proc(int index, floatp in, const gs_cie_wbsd * pwbsd,
		      gs_cie_render * pcrd, float *out)
{
    *out = DENT(in, dent_PQR);
    return 0;
}
private const gs_cie_transform_proc3 bit_TransformPQR = {
    bit_TransformPQR_proc, "bitTPQRDefault", {0, 0}, 0
};
private const float dent_LMN = 1.0;
private float
bit_EncodeLMN_proc(floatp in, const gs_cie_render * pcrd)
{
    return DENT(in, dent_LMN);
}
private const gs_cie_render_proc3 bit_EncodeLMN = { /* dummy */
    {bit_EncodeLMN_proc, bit_EncodeLMN_proc, bit_EncodeLMN_proc}
};
private const gs_range3 bit_RangeLMN = {
    {{0, (float)0.9505}, {0, 1}, {0, (float)1.0890}}
};
private const gs_matrix3 bit_MatrixABC = {
    {(float) 3.24063, (float)-0.96893, (float) 0.05571},
    {(float)-1.53721, (float) 1.87576, (float)-0.20402},
    {(float)-0.49863, (float) 0.04152, (float) 1.05700}
};
private float
bit_EncodeABC_proc(floatp in, const gs_cie_render * pcrd)
{
    return pow(max(in, 0.0), 0.45);
}
private const gs_cie_render_proc3 bit_EncodeABC = {
    {bit_EncodeABC_proc, bit_EncodeABC_proc, bit_EncodeABC_proc}
};
/* These RenderTables are no-ops. */
private const byte bit_rtt0[2*2*3] = {
    /*0,0,0*/ 0,0,0,
    /*0,0,1*/ 0,0,255,
    /*0,1,0*/ 0,255,0,
    /*0,1,1*/ 0,255,255
};
private const byte bit_rtt1[2*2*3] = {
    /*1,0,0*/ 255,0,0,
    /*1,0,1*/ 255,0,255,
    /*1,1,0*/ 255,255,0,
    /*1,1,1*/ 255,255,255
};
private const gs_const_string bit_rt_data[2] = {
    {bit_rtt0, 2*2*3}, {bit_rtt1, 2*2*3}
};
private frac
bit_rt_proc(byte in, const gs_cie_render *pcrd)
{
    return frac_1 * in / 255;
}
private const gs_cie_render_table_t bit_RenderTable = {	/* dummy */
    {3, {2, 2, 2}, 3, bit_rt_data},
    {{bit_rt_proc, bit_rt_proc, bit_rt_proc}}
};

/*
 * Implement get_params for a sample device CRD.  A useful convention,
 * for devices that can provide more than one CRD, is to have a settable
 * parameter CRDName, which gives the name of the CRD in use.  This sample
 * code provides a constant CRDName: making it settable is left as an
 * exercise to the reader.
 */
int
sample_device_crd_get_params(gx_device *pdev, gs_param_list *plist,
			     const char *crd_param_name)
{
    int ecode = 0;

    if (param_requested(plist, "CRDName") > 0) {
	gs_param_string cns;
	int code;

	cns.data = (const byte *)crd_param_name;
	cns.size = strlen(crd_param_name);
	cns.persistent = true;
	code = param_write_string(plist, "CRDName", &cns);
	if (code < 0)
	    ecode = code;
    }
    if (param_requested(plist, crd_param_name) > 0) {
	gs_cie_render *pcrd;
	int code = gs_cie_render1_build(&pcrd, pdev->memory,
					"sample_device_crd_get_params");
	if (code >= 0) {
	    gs_cie_transform_proc3 tpqr;

	    tpqr = bit_TransformPQR;
	    tpqr.driver_name = pdev->dname;
	    code = gs_cie_render1_initialize(pdev->memory, pcrd, NULL,
			&bit_WhitePoint, NULL /*BlackPoint*/,
			NULL /*MatrixPQR*/, &bit_RangePQR, &tpqr,
			NULL /*MatrixLMN*/, &bit_EncodeLMN, &bit_RangeLMN,
			&bit_MatrixABC, &bit_EncodeABC, NULL /*RangeABC*/,
			&bit_RenderTable);
	    if (code >= 0) {
		code = param_write_cie_render1(plist, crd_param_name, pcrd,
					       pdev->memory);
	    }
	    rc_decrement(pcrd, "sample_device_crd_get_params"); /* release */
	}
	if (code < 0)
	    ecode = code;
    }
    if (param_requested(plist, bit_TransformPQR.proc_name) > 0) {
	/*
	 * We definitely do not recommend the following use of a static
	 * to hold the address: this is a shortcut.
	 */
	gs_cie_transform_proc my_proc = bit_TransformPQR_proc;
	byte *my_addr = gs_alloc_string(pdev->memory, sizeof(my_proc),
					"sd_crd_get_params(proc)");
	int code;

	if (my_addr == 0)
	    code = gs_note_error(gs_error_VMerror);
	else {
	    gs_param_string as;

	    memcpy(my_addr, &my_proc, sizeof(my_proc));
	    as.data = my_addr;
	    as.size = sizeof(my_proc);
	    as.persistent = true;
	    code = param_write_string(plist, bit_TransformPQR.proc_name, &as);
	}
	if (code < 0)
	    ecode = code;
    }
    return ecode;
}