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Diffstat (limited to 'contrib/gregbook/readppm.c')
| -rw-r--r-- | contrib/gregbook/readppm.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/contrib/gregbook/readppm.c b/contrib/gregbook/readppm.c deleted file mode 100644 index be9a56d..0000000 --- a/contrib/gregbook/readppm.c +++ /dev/null @@ -1,179 +0,0 @@ -/*--------------------------------------------------------------------------- - - rpng - simple PNG display program readppm.c - - --------------------------------------------------------------------------- - - This is a special-purpose replacement for readpng.c that allows binary - PPM files to be used in place of PNG images. - - --------------------------------------------------------------------------- - - Copyright (c) 1998-2007 Greg Roelofs. All rights reserved. - - This software is provided "as is," without warranty of any kind, - express or implied. In no event shall the author or contributors - be held liable for any damages arising in any way from the use of - this software. - - The contents of this file are DUAL-LICENSED. You may modify and/or - redistribute this software according to the terms of one of the - following two licenses (at your option): - - - LICENSE 1 ("BSD-like with advertising clause"): - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute - it freely, subject to the following restrictions: - - 1. Redistributions of source code must retain the above copyright - notice, disclaimer, and this list of conditions. - 2. Redistributions in binary form must reproduce the above copyright - notice, disclaimer, and this list of conditions in the documenta- - tion and/or other materials provided with the distribution. - 3. All advertising materials mentioning features or use of this - software must display the following acknowledgment: - - This product includes software developed by Greg Roelofs - and contributors for the book, "PNG: The Definitive Guide," - published by O'Reilly and Associates. - - - LICENSE 2 (GNU GPL v2 or later): - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - - ---------------------------------------------------------------------------*/ - -#include <stdio.h> -#include <stdlib.h> - -#include "readpng.h" /* typedefs, common macros, public prototypes */ - - -ulg width, height; -int bit_depth, color_type, channels; -uch *image_data = NULL; -FILE *saved_infile; - - -void readpng_version_info() -{ - fprintf(stderr, " Compiled without libpng, zlib or PBMPLUS/NetPBM.\n"); -} - - -/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */ - -int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight) -{ - static uch ppmline[256]; - int maxval; - - - saved_infile = infile; - - fgets(ppmline, 256, infile); - if (ppmline[0] != 'P' || ppmline[1] != '6') { - fprintf(stderr, "ERROR: not a PPM file\n"); - return 1; - } - /* possible color types: P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */ - if (ppmline[1] == '6') { - color_type = 2; - channels = 3; - } else if (ppmline[1] == '8') { - color_type = 6; - channels = 4; - } else /* if (ppmline[1] == '5') */ { - color_type = 0; - channels = 1; - } - - do { - fgets(ppmline, 256, infile); - } while (ppmline[0] == '#'); - sscanf(ppmline, "%lu %lu", &width, &height); - - do { - fgets(ppmline, 256, infile); - } while (ppmline[0] == '#'); - sscanf(ppmline, "%d", &maxval); - if (maxval != 255) { - fprintf(stderr, "ERROR: maxval = %d\n", maxval); - return 2; - } - bit_depth = 8; - - *pWidth = width; - *pHeight = height; - - return 0; -} - - - - -/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error; - * scales values to 8-bit if necessary */ - -int readpng_get_bgcolor(uch *red, uch *green, uch *blue) -{ - return 1; -} - - - - -/* display_exponent == LUT_exponent * CRT_exponent */ - -uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes) -{ - ulg rowbytes; - - - /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits, - * transparency chunks to full alpha channel; strip 16-bit-per-sample - * images to 8 bits per sample; and convert grayscale to RGB[A] */ - - /* GRR WARNING: grayscale needs to be expanded and channels reset! */ - - *pRowbytes = rowbytes = channels*width; - *pChannels = channels; - - if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) { - return NULL; - } - - Trace((stderr, "readpng_get_image: rowbytes = %ld, height = %ld\n", rowbytes, height)); - - - /* now we can go ahead and just read the whole image */ - - fread(image_data, 1L, rowbytes*height, saved_infile); - - - return image_data; -} - - -void readpng_cleanup(int free_image_data) -{ - if (free_image_data && image_data) { - free(image_data); - image_data = NULL; - } -} |