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/* Copyright (C) 1995, 1996 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: gdevstc1.c,v 1.4 2002/02/21 22:24:52 giles Exp $*/
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/* Epson Stylus-Color Printer-Driver */
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/***
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This file holds the sample-implementation of a monochrome-algorithm for
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the stcolor-driver. It is available via
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gs -sDEVICE=stcolor -sDithering=gsmono ...
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Actually this is no dithering-algorithm, it lets ghostscript do the job.
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This achieved, by requesting BYTE-Values between 0 and 1 to be delivered,
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which causes a depth of 1-Bit by default.
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***/
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/*
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* gdevstc.h holds all the includes and the driver-specific definitions, so
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* it is the only include you need. To add a new algorthim, STC_MODI in
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* gdevstc.h should be extended. (see the instructions there)
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*/
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#include "gdevstc.h"
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/*
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* the routine required.
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*/
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/*ARGSUSED*/
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int
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stc_gsmono(stcolor_device *sdev,int npixel,byte *in,byte *buf,byte *out)
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{
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/*
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* There are basically 3 Types of calls:
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* npixel < 0 => initialize buf, if this is required
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* (happens only if requested)
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* npixel > 0 => process next scanline, if the flag STC_WHITE is set, then
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* in == NULL signals, that the basic-driver has decided
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* that this scanline is white. (Useful for really dithering
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* drivers)
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*/
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/* ============================================================= */
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if(npixel > 0) { /* npixel > 0 -> scanline-processing */
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/* ============================================================= */
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/* -----------------------------------------------*/
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if(in != NULL) { /* normal processing */
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/* -----------------------------------------------*/
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memcpy(out,in,npixel); /* really simple algorithm */
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/* -----------------------------------------------*/
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} else { /* skip-notification */
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/* -----------------------------------------------*/
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/* An algorithm may use the output-line as a buffer.
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So it might need to be cleared on white-lines.
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*/
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memset(out,0,npixel);
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/* -----------------------------------------------*/
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} /* normal / skip */
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/* -----------------------------------------------*/
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/* ============================================================= */
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} else { /* npixel <= 0 -> initialisation */
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/* ============================================================= */
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/*
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* the optional buffer is already allocated by the basic-driver, here
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* you just need to fill it, for instance, set it all to zeros:
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*/
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int buf_size;
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/*
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* compute the size of the buffer, according to the requested values
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* the buffer consists of a constant part, e.g. related to the number
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* of color-components, and a number of arrays, which are multiples of
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* the size of a scanline times the number of components.
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* additionally, the size of the scanlines may be expanded by one to the
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* right and to the left.
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*/
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buf_size =
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sdev->stc.dither->bufadd /* scanline-independend size */
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+ (-npixel) /* pixels */
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* (sdev->stc.dither->flags/STC_SCAN) /* * scanlines */
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* sdev->color_info.num_components; /* * comp */
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if(buf_size > 0) { /* we obviously have a buffer */
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memset(buf,0,buf_size * sdev->stc.alg_item);
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} /* we obviously have a buffer */
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/*
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* Usually one should check parameters upon initializaon
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*/
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if(sdev->color_info.num_components != 1) return -1;
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if((sdev->stc.dither->flags & STC_TYPE) != STC_BYTE) return -2;
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/*
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* must neither have STC_DIRECT nor STC_WHITE
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*/
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if((sdev->stc.dither->flags & STC_DIRECT) != 0) return -3;
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} /* scanline-processing or initialisation */
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return 0; /* negative values are error-codes, that abort printing */
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}
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