| 2 |
- |
1 |
/* Copyright (C) 1995, 1996, 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: sisparam.h,v 1.4 2002/02/21 22:24:54 giles Exp $ */
|
|
|
18 |
/* Generic image scaling stream definitions */
|
|
|
19 |
/* Requires strimpl.h */
|
|
|
20 |
|
|
|
21 |
#ifndef sisparam_INCLUDED
|
|
|
22 |
# define sisparam_INCLUDED
|
|
|
23 |
|
|
|
24 |
/*
|
|
|
25 |
* Image scaling streams all use a common set of parameters to define the
|
|
|
26 |
* input and output data. That is what we define here.
|
|
|
27 |
*/
|
|
|
28 |
|
|
|
29 |
/* Input values */
|
|
|
30 |
/*typedef byte PixelIn; */ /* per BitsPerComponentIn */
|
|
|
31 |
/*#define MaxValueIn 255 */ /* per MaxValueIn */
|
|
|
32 |
|
|
|
33 |
/* Output values */
|
|
|
34 |
/*typedef byte PixelOut; */ /* per BitsPerComponentOut */
|
|
|
35 |
/*#define MaxValueOut 255 */ /* per MaxValueOut */
|
|
|
36 |
|
|
|
37 |
/*
|
|
|
38 |
* The 'support' S of a digital filter is the value such that the filter is
|
|
|
39 |
* guaranteed to be zero for all arguments outside the range [-S..S]. We
|
|
|
40 |
* limit the support so that we can put an upper bound on the time required
|
|
|
41 |
* to compute an output value and on the amount of storage required for
|
|
|
42 |
* X-filtered input data; this also allows us to use pre-scaled fixed-point
|
|
|
43 |
* values for the weights if we wish.
|
|
|
44 |
*
|
|
|
45 |
* 8x8 pixels should be enough for any reasonable application....
|
|
|
46 |
*/
|
|
|
47 |
#define LOG2_MAX_ISCALE_SUPPORT 3
|
|
|
48 |
#define MAX_ISCALE_SUPPORT (1 << LOG2_MAX_ISCALE_SUPPORT)
|
|
|
49 |
|
|
|
50 |
/* Define image scaling stream parameters. */
|
|
|
51 |
typedef struct stream_image_scale_params_s {
|
|
|
52 |
int Colors; /* >= 1 */
|
|
|
53 |
int BitsPerComponentIn; /* bits per input value, 8 or 16 */
|
|
|
54 |
uint MaxValueIn; /* max value of input component, */
|
|
|
55 |
/* 0 < MaxValueIn < 1 << BitsPerComponentIn */
|
|
|
56 |
int WidthIn, HeightIn; /* > 0 */
|
|
|
57 |
int BitsPerComponentOut; /* bits per output value, 8 or 16 */
|
|
|
58 |
uint MaxValueOut; /* max value of output component, */
|
|
|
59 |
/* 0 < MaxValueOut < 1 << BitsPerComponentOut*/
|
|
|
60 |
int WidthOut, HeightOut; /* > 0 */
|
|
|
61 |
} stream_image_scale_params_t;
|
|
|
62 |
|
|
|
63 |
/* Define a generic image scaling stream state. */
|
|
|
64 |
|
|
|
65 |
#define stream_image_scale_state_common\
|
|
|
66 |
stream_state_common;\
|
|
|
67 |
stream_image_scale_params_t params
|
|
|
68 |
|
|
|
69 |
typedef struct stream_image_scale_state_s {
|
|
|
70 |
stream_image_scale_state_common;
|
|
|
71 |
} stream_image_scale_state;
|
|
|
72 |
|
|
|
73 |
#endif /* sisparam_INCLUDED */
|