| 2 |
- |
1 |
/* Copyright (C) 1995, 1996 Aladdin Enterprises. All rights reserved.
|
|
|
2 |
|
|
|
3 |
This software is provided AS-IS with no warranty, either express or
|
|
|
4 |
implied.
|
|
|
5 |
|
|
|
6 |
This software is distributed under license and may not be copied,
|
|
|
7 |
modified or distributed except as expressly authorized under the terms
|
|
|
8 |
of the license contained in the file LICENSE in this distribution.
|
|
|
9 |
|
|
|
10 |
For more information about licensing, please refer to
|
|
|
11 |
http://www.ghostscript.com/licensing/. For information on
|
|
|
12 |
commercial licensing, go to http://www.artifex.com/licensing/ or
|
|
|
13 |
contact Artifex Software, Inc., 101 Lucas Valley Road #110,
|
|
|
14 |
San Rafael, CA 94903, U.S.A., +1(415)492-9861.
|
|
|
15 |
*/
|
|
|
16 |
|
|
|
17 |
/* $Id: gdevstc3.c,v 1.4 2002/02/21 22:24:52 giles Exp $*/
|
|
|
18 |
/* Epson Stylus-Color Printer-Driver */
|
|
|
19 |
|
|
|
20 |
/***
|
|
|
21 |
This file holds the sample-implementation of a RGB-algorithm for
|
|
|
22 |
the stcolor-driver. It is available via
|
|
|
23 |
|
|
|
24 |
gs -sDEVICE=stcolor -sDithering=gsrgb ...
|
|
|
25 |
|
|
|
26 |
Actually this is no dithering-algorithm, it lets ghostscript do the job.
|
|
|
27 |
This achieved, by requesting BYTE-Values between 0 and 1 to be delivered,
|
|
|
28 |
which causes a depth of 1-Bit by default.
|
|
|
29 |
|
|
|
30 |
***/
|
|
|
31 |
|
|
|
32 |
/*
|
|
|
33 |
* gdevstc.h holds all the includes and the driver-specific definitions, so
|
|
|
34 |
* it is the only include you need. To add a new algorthim, STC_MODI in
|
|
|
35 |
* gdevstc.h should be extended. (see the instructions there)
|
|
|
36 |
*/
|
|
|
37 |
|
|
|
38 |
#include "gdevstc.h"
|
|
|
39 |
|
|
|
40 |
/*
|
|
|
41 |
* the routine required.
|
|
|
42 |
*/
|
|
|
43 |
|
|
|
44 |
/*ARGSUSED*/
|
|
|
45 |
int
|
|
|
46 |
stc_gsrgb(stcolor_device *sdev,int npixel,byte *ip,byte *buf,byte *out)
|
|
|
47 |
{
|
|
|
48 |
|
|
|
49 |
int error = 0;
|
|
|
50 |
|
|
|
51 |
/*
|
|
|
52 |
* There are basically 3 Types of calls:
|
|
|
53 |
* npixel < 0 => initialize buf, if this is required
|
|
|
54 |
* (happens only if requested)
|
|
|
55 |
* npixel > 0 => process next scanline, if the flag STC_WHITE is set, then
|
|
|
56 |
* in == NULL signals, that the basic-driver has decided
|
|
|
57 |
* that this scanline is white. (Useful for really dithering
|
|
|
58 |
* drivers)
|
|
|
59 |
*/
|
|
|
60 |
|
|
|
61 |
/* ============================================================= */
|
|
|
62 |
if(npixel > 0) { /* npixel > 0 -> scanline-processing */
|
|
|
63 |
/* ============================================================= */
|
|
|
64 |
|
|
|
65 |
int p;
|
|
|
66 |
|
|
|
67 |
/*
|
|
|
68 |
* simply merge the color-values into a single byte
|
|
|
69 |
* (RED, GREEN, BLUE are defined in gdevstc.h)
|
|
|
70 |
*/
|
|
|
71 |
for(p = 0; p < npixel; ++p,++out) { /* loop over pixels */
|
|
|
72 |
|
|
|
73 |
*out = 0;
|
|
|
74 |
if(*ip++) *out |= RED;
|
|
|
75 |
if(*ip++) *out |= GREEN;
|
|
|
76 |
if(*ip++) *out |= BLUE;
|
|
|
77 |
|
|
|
78 |
} /* loop over pixels */
|
|
|
79 |
|
|
|
80 |
/* ============================================================= */
|
|
|
81 |
} else { /* npixel <= 0 -> initialisation */
|
|
|
82 |
/* ============================================================= */
|
|
|
83 |
/*
|
|
|
84 |
* besides buffer-Initialisation, one may check the parameters in
|
|
|
85 |
* the algorithm-table of the driver.
|
|
|
86 |
*/
|
|
|
87 |
|
|
|
88 |
/* we didn't check for the white-calls above, so they would cause errors */
|
|
|
89 |
if(sdev->stc.dither->flags & STC_WHITE) error = -1;
|
|
|
90 |
|
|
|
91 |
/* if we're not setup for bytes, this is an error too */
|
|
|
92 |
if((sdev->stc.dither->flags & STC_TYPE) != STC_BYTE) error = -2;
|
|
|
93 |
|
|
|
94 |
/* and rgb-mode is the only supported mode */
|
|
|
95 |
if(sdev->color_info.num_components != 3) error = -3;
|
|
|
96 |
|
|
|
97 |
/* we can't deal with ghostscript-data directly. */
|
|
|
98 |
if(sdev->stc.dither->flags & STC_DIRECT) error = -4;
|
|
|
99 |
|
|
|
100 |
/* ============================================================= */
|
|
|
101 |
} /* scanline-processing or initialisation */
|
|
|
102 |
/* ============================================================= */
|
|
|
103 |
|
|
|
104 |
return error;
|
|
|
105 |
}
|