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|    1 /* |    1 /* | 
|    2  * wrppm.c |    2  * wrppm.c | 
|    3  * |    3  * | 
|    4  * Copyright (C) 1991-1996, Thomas G. Lane. |    4  * Copyright (C) 1991-1996, Thomas G. Lane. | 
 |    5  * Modified 2009 by Guido Vollbeding. | 
|    5  * This file is part of the Independent JPEG Group's software. |    6  * This file is part of the Independent JPEG Group's software. | 
|    6  * For conditions of distribution and use, see the accompanying README file. |    7  * For conditions of distribution and use, see the accompanying README file. | 
|    7  * |    8  * | 
|    8  * This file contains routines to write output images in PPM/PGM format. |    9  * This file contains routines to write output images in PPM/PGM format. | 
|    9  * The extended 2-byte-per-sample raw PPM/PGM formats are supported. |   10  * The extended 2-byte-per-sample raw PPM/PGM formats are supported. | 
|   10  * The PBMPLUS library is NOT required to compile this software |   11  * The PBMPLUS library is NOT required to compile this software | 
|   11  * (but it is highly useful as a set of PPM image manipulation programs). |   12  * (but it is highly useful as a set of PPM image manipulation programs). | 
|   12  * |   13  * | 
|   13  * These routines may need modification for non-Unix environments or |   14  * These routines may need modification for non-Unix environments or | 
|   14  * specialized applications.  As they stand, they assume output to |   15  * specialized applications.  As they stand, they assume output to | 
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|   33 #if BITS_IN_JSAMPLE == 8 |   34 #if BITS_IN_JSAMPLE == 8 | 
|   34 #define PUTPPMSAMPLE(ptr,v)  *ptr++ = (char) (v) |   35 #define PUTPPMSAMPLE(ptr,v)  *ptr++ = (char) (v) | 
|   35 #define BYTESPERSAMPLE 1 |   36 #define BYTESPERSAMPLE 1 | 
|   36 #define PPM_MAXVAL 255 |   37 #define PPM_MAXVAL 255 | 
|   37 #else |   38 #else | 
|   38 #ifdef PPM_NORAWWORD |   39 #ifdef PPM_NORAWWORD | 
|   39 #define PUTPPMSAMPLE(ptr,v)  *ptr++ = (char) ((v) >> (BITS_IN_JSAMPLE-8)) |   40 #define PUTPPMSAMPLE(ptr,v)  *ptr++ = (char) ((v) >> (BITS_IN_JSAMPLE-8)) | 
|   40 #define BYTESPERSAMPLE 1 |   41 #define BYTESPERSAMPLE 1 | 
|   41 #define PPM_MAXVAL 255 |   42 #define PPM_MAXVAL 255 | 
|   42 #else |   43 #else | 
|   43 /* The word-per-sample format always puts the LSB first. */ |   44 /* The word-per-sample format always puts the MSB first. */ | 
|   44 #define PUTPPMSAMPLE(ptr,v)                     \ |   45 #define PUTPPMSAMPLE(ptr,v)                     \ | 
|   45         { register int val_ = v;                \ |   46         { register int val_ = v;                \ | 
 |   47           *ptr++ = (char) ((val_ >> 8) & 0xFF); \ | 
|   46           *ptr++ = (char) (val_ & 0xFF);        \ |   48           *ptr++ = (char) (val_ & 0xFF);        \ | 
|   47           *ptr++ = (char) ((val_ >> 8) & 0xFF); \ |  | 
|   48         } |   49         } | 
|   49 #define BYTESPERSAMPLE 2 |   50 #define BYTESPERSAMPLE 2 | 
|   50 #define PPM_MAXVAL ((1<<BITS_IN_JSAMPLE)-1) |   51 #define PPM_MAXVAL ((1<<BITS_IN_JSAMPLE)-1) | 
|   51 #endif |   52 #endif | 
|   52 #endif |   53 #endif | 
|   53  |   54  | 
|   54  |   55  | 
|   55 /* |   56 /* | 
|   56  * When JSAMPLE is the same size as char, we can just fwrite() the |   57  * When JSAMPLE is the same size as char, we can just fwrite() the | 
|   57  * decompressed data to the PPM or PGM file.  On PCs, in order to make this |   58  * decompressed data to the PPM or PGM file.  On PCs, in order to make this | 
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|  259     dest->pixrow = (JSAMPROW) dest->iobuffer; |  260     dest->pixrow = (JSAMPROW) dest->iobuffer; | 
|  260     dest->pub.buffer = & dest->pixrow; |  261     dest->pub.buffer = & dest->pixrow; | 
|  261     dest->pub.buffer_height = 1; |  262     dest->pub.buffer_height = 1; | 
|  262     dest->pub.put_pixel_rows = put_pixel_rows; |  263     dest->pub.put_pixel_rows = put_pixel_rows; | 
|  263   } |  264   } | 
|  264  |  265  | 
|  265   return (djpeg_dest_ptr) dest; |  266   return (djpeg_dest_ptr) dest; | 
|  266 } |  267 } | 
|  267  |  268  | 
|  268 #endif /* PPM_SUPPORTED */ |  269 #endif /* PPM_SUPPORTED */ | 
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