| 1 | /*---------------------------------------------------------------------------
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| 2 |
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| 3 | rpng - simple PNG display program readpng.h
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| 4 |
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| 5 | ---------------------------------------------------------------------------
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| 6 |
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| 7 | Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
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| 8 |
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| 9 | This software is provided "as is," without warranty of any kind,
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| 10 | express or implied. In no event shall the author or contributors
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| 11 | be held liable for any damages arising in any way from the use of
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| 12 | this software.
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| 13 |
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| 14 | Permission is granted to anyone to use this software for any purpose,
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| 15 | including commercial applications, and to alter it and redistribute
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| 16 | it freely, subject to the following restrictions:
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| 17 |
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| 18 | 1. Redistributions of source code must retain the above copyright
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| 19 | notice, disclaimer, and this list of conditions.
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| 20 | 2. Redistributions in binary form must reproduce the above copyright
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| 21 | notice, disclaimer, and this list of conditions in the documenta-
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| 22 | tion and/or other materials provided with the distribution.
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| 23 | 3. All advertising materials mentioning features or use of this
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| 24 | software must display the following acknowledgment:
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| 25 |
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| 26 | This product includes software developed by Greg Roelofs
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| 27 | and contributors for the book, "PNG: The Definitive Guide,"
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| 28 | published by O'Reilly and Associates.
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| 29 |
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| 30 | ---------------------------------------------------------------------------*/
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| 31 |
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| 32 | #ifndef TRUE
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| 33 | # define TRUE 1
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| 34 | # define FALSE 0
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| 35 | #endif
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| 36 |
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| 37 | #ifndef MAX
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| 38 | # define MAX(a,b) ((a) > (b)? (a) : (b))
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| 39 | # define MIN(a,b) ((a) < (b)? (a) : (b))
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| 40 | #endif
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| 41 |
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| 42 | #ifdef DEBUG
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| 43 | # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
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| 44 | #else
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| 45 | # define Trace(x) ;
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| 46 | #endif
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| 47 |
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| 48 | typedef unsigned char uch;
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| 49 | typedef unsigned short ush;
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| 50 | typedef unsigned long ulg;
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| 51 |
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| 52 |
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| 53 | /* prototypes for public functions in readpng.c */
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| 54 |
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| 55 | void readpng_version_info(void);
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| 56 |
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| 57 | int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
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| 58 |
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| 59 | int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
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| 60 |
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| 61 | uch *readpng_get_image(double display_exponent, int *pChannels,
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| 62 | ulg *pRowbytes);
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| 63 |
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| 64 | void readpng_cleanup(int free_image_data);
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