| 2 |
- |
1 |
/* Copyright (C) 1999 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: gxiclass.h,v 1.5 2002/06/16 08:45:43 lpd Exp $ */
|
|
|
18 |
/* Define image rendering algorithm classes */
|
|
|
19 |
|
|
|
20 |
#ifndef gxiclass_INCLUDED
|
|
|
21 |
# define gxiclass_INCLUDED
|
|
|
22 |
|
|
|
23 |
/* Define the abstract type for the image enumerator state. */
|
|
|
24 |
typedef struct gx_image_enum_s gx_image_enum;
|
|
|
25 |
|
|
|
26 |
#ifndef gx_device_DEFINED
|
|
|
27 |
# define gx_device_DEFINED
|
|
|
28 |
typedef struct gx_device_s gx_device;
|
|
|
29 |
#endif
|
|
|
30 |
|
|
|
31 |
/*
|
|
|
32 |
* Define the interface for routines used to render a (source) scan line.
|
|
|
33 |
* If the buffer is the original client's input data, it may be unaligned;
|
|
|
34 |
* otherwise, it will always be aligned.
|
|
|
35 |
*
|
|
|
36 |
* The image_render procedures work on fully expanded, complete rows. These
|
|
|
37 |
* take a height argument, which is an integer >= 0; they return a negative
|
|
|
38 |
* code, or the number of rows actually processed (which may be less than
|
|
|
39 |
* the height). height = 0 is a special call to indicate that there is no
|
|
|
40 |
* more input data; this is necessary because the last scan lines of the
|
|
|
41 |
* source data may not produce any output.
|
|
|
42 |
*
|
|
|
43 |
* Note that the 'w' argument of the image_render procedure is the number
|
|
|
44 |
* of samples, i.e., the number of pixels * the number of samples per pixel.
|
|
|
45 |
* This is neither the width in pixels nor the width in bytes (in the case
|
|
|
46 |
* of 12-bit samples, which expand to 2 bytes apiece).
|
|
|
47 |
*/
|
|
|
48 |
#define irender_proc(proc)\
|
|
|
49 |
int proc(gx_image_enum *penum, const byte *buffer, int data_x,\
|
|
|
50 |
uint w, int h, gx_device *dev)
|
|
|
51 |
typedef irender_proc((*irender_proc_t));
|
|
|
52 |
|
|
|
53 |
/*
|
|
|
54 |
* Define procedures for selecting imaging methods according to the class of
|
|
|
55 |
* the image. Image class procedures are called in alphabetical order, so
|
|
|
56 |
* their names begin with a digit that indicates their priority
|
|
|
57 |
* (0_interpolate, etc.): each one may assume that all the previous ones
|
|
|
58 |
* failed. If a class procedure succeeds, it may update the enumerator
|
|
|
59 |
* structure as well as returning the rendering procedure.
|
|
|
60 |
*/
|
|
|
61 |
#define iclass_proc(proc)\
|
|
|
62 |
irender_proc_t proc(gx_image_enum *penum)
|
|
|
63 |
typedef iclass_proc((*gx_image_class_t));
|
|
|
64 |
|
|
|
65 |
#endif /* gxiclass_INCLUDED */
|