ReactOS  0.4.14-dev-384-g5b37caa
wrppm.c
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1 /*
2  * wrppm.c
3  *
4  * Copyright (C) 1991-1996, Thomas G. Lane.
5  * Modified 2009-2017 by Guido Vollbeding.
6  * This file is part of the Independent JPEG Group's software.
7  * For conditions of distribution and use, see the accompanying README file.
8  *
9  * This file contains routines to write output images in PPM/PGM format.
10  * The extended 2-byte-per-sample raw PPM/PGM formats are supported.
11  * The PBMPLUS library is NOT required to compile this software
12  * (but it is highly useful as a set of PPM image manipulation programs).
13  *
14  * These routines may need modification for non-Unix environments or
15  * specialized applications. As they stand, they assume output to
16  * an ordinary stdio stream.
17  */
18 
19 #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
20 
21 #ifdef PPM_SUPPORTED
22 
23 
24 /*
25  * For 12-bit JPEG data, we either downscale the values to 8 bits
26  * (to write standard byte-per-sample PPM/PGM files), or output
27  * nonstandard word-per-sample PPM/PGM files. Downscaling is done
28  * if PPM_NORAWWORD is defined (this can be done in the Makefile
29  * or in jconfig.h).
30  * (When the core library supports data precision reduction, a cleaner
31  * implementation will be to ask for that instead.)
32  */
33 
34 #if BITS_IN_JSAMPLE == 8
35 #define PUTPPMSAMPLE(ptr,v) *ptr++ = (char) (v)
36 #define BYTESPERSAMPLE 1
37 #define PPM_MAXVAL 255
38 #else
39 #ifdef PPM_NORAWWORD
40 #define PUTPPMSAMPLE(ptr,v) *ptr++ = (char) ((v) >> (BITS_IN_JSAMPLE-8))
41 #define BYTESPERSAMPLE 1
42 #define PPM_MAXVAL 255
43 #else
44 /* The word-per-sample format always puts the MSB first. */
45 #define PUTPPMSAMPLE(ptr,v) \
46  { register int val_ = v; \
47  *ptr++ = (char) ((val_ >> 8) & 0xFF); \
48  *ptr++ = (char) (val_ & 0xFF); \
49  }
50 #define BYTESPERSAMPLE 2
51 #define PPM_MAXVAL ((1<<BITS_IN_JSAMPLE)-1)
52 #endif
53 #endif
54 
55 
56 /*
57  * When JSAMPLE is the same size as char, we can just fwrite() the
58  * decompressed data to the PPM or PGM file. On PCs, in order to make this
59  * work the output buffer must be allocated in near data space, because we are
60  * assuming small-data memory model wherein fwrite() can't reach far memory.
61  * If you need to process very wide images on a PC, you might have to compile
62  * in large-memory model, or else replace fwrite() with a putc() loop ---
63  * which will be much slower.
64  */
65 
66 
67 /* Private version of data destination object */
68 
69 typedef struct {
70  struct djpeg_dest_struct pub; /* public fields */
71 
72  /* Usually these two pointers point to the same place: */
73  char *iobuffer; /* fwrite's I/O buffer */
74  JSAMPROW pixrow; /* decompressor output buffer */
75  size_t buffer_width; /* width of I/O buffer */
76  JDIMENSION samples_per_row; /* JSAMPLEs per output row */
77 } ppm_dest_struct;
78 
79 typedef ppm_dest_struct * ppm_dest_ptr;
80 
81 
82 /*
83  * Write some pixel data.
84  * In this module rows_supplied will always be 1.
85  *
86  * put_pixel_rows handles the "normal" 8-bit case where the decompressor
87  * output buffer is physically the same as the fwrite buffer.
88  */
89 
90 METHODDEF(void)
91 put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
92  JDIMENSION rows_supplied)
93 {
94  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
95 
96  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
97 }
98 
99 
100 /*
101  * This code is used when we have to copy the data and apply a pixel
102  * format translation. Typically this only happens in 12-bit mode.
103  */
104 
105 METHODDEF(void)
106 copy_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
107  JDIMENSION rows_supplied)
108 {
109  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
110  register char * bufferptr;
111  register JSAMPROW ptr;
112  register JDIMENSION col;
113 
114  ptr = dest->pub.buffer[0];
115  bufferptr = dest->iobuffer;
116  for (col = dest->samples_per_row; col > 0; col--) {
117  PUTPPMSAMPLE(bufferptr, GETJSAMPLE(*ptr++));
118  }
119  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
120 }
121 
122 
123 /*
124  * Write some pixel data when color quantization is in effect.
125  * We have to demap the color index values to straight data.
126  */
127 
128 METHODDEF(void)
129 put_demapped_rgb (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
130  JDIMENSION rows_supplied)
131 {
132  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
133  register char * bufferptr;
134  register int pixval;
135  register JSAMPROW ptr;
136  register JSAMPROW color_map0 = cinfo->colormap[0];
137  register JSAMPROW color_map1 = cinfo->colormap[1];
138  register JSAMPROW color_map2 = cinfo->colormap[2];
139  register JDIMENSION col;
140 
141  ptr = dest->pub.buffer[0];
142  bufferptr = dest->iobuffer;
143  for (col = cinfo->output_width; col > 0; col--) {
144  pixval = GETJSAMPLE(*ptr++);
145  PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map0[pixval]));
146  PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map1[pixval]));
147  PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map2[pixval]));
148  }
149  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
150 }
151 
152 
153 METHODDEF(void)
154 put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
155  JDIMENSION rows_supplied)
156 {
157  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
158  register char * bufferptr;
159  register JSAMPROW ptr;
160  register JSAMPROW color_map = cinfo->colormap[0];
161  register JDIMENSION col;
162 
163  ptr = dest->pub.buffer[0];
164  bufferptr = dest->iobuffer;
165  for (col = cinfo->output_width; col > 0; col--) {
166  PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map[GETJSAMPLE(*ptr++)]));
167  }
168  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
169 }
170 
171 
172 /*
173  * Startup: write the file header.
174  */
175 
176 METHODDEF(void)
177 start_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
178 {
179  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
180 
181  /* Emit file header */
182  switch (cinfo->out_color_space) {
183  case JCS_GRAYSCALE:
184  /* emit header for raw PGM format */
185  fprintf(dest->pub.output_file, "P5\n%ld %ld\n%d\n",
186  (long) cinfo->output_width, (long) cinfo->output_height,
187  PPM_MAXVAL);
188  break;
189  case JCS_RGB:
190  /* emit header for raw PPM format */
191  fprintf(dest->pub.output_file, "P6\n%ld %ld\n%d\n",
192  (long) cinfo->output_width, (long) cinfo->output_height,
193  PPM_MAXVAL);
194  break;
195  default:
196  ERREXIT(cinfo, JERR_PPM_COLORSPACE);
197  }
198 }
199 
200 
201 /*
202  * Finish up at the end of the file.
203  */
204 
205 METHODDEF(void)
206 finish_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
207 {
208  /* Make sure we wrote the output file OK */
209  JFFLUSH(dinfo->output_file);
210  if (JFERROR(dinfo->output_file))
211  ERREXIT(cinfo, JERR_FILE_WRITE);
212 }
213 
214 
215 /*
216  * The module selection routine for PPM format output.
217  */
218 
220 jinit_write_ppm (j_decompress_ptr cinfo)
221 {
222  ppm_dest_ptr dest;
223 
224  /* Create module interface object, fill in method pointers */
225  dest = (ppm_dest_ptr)
226  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
227  SIZEOF(ppm_dest_struct));
228  dest->pub.start_output = start_output_ppm;
229  dest->pub.finish_output = finish_output_ppm;
230 
231  /* Calculate output image dimensions so we can allocate space */
233 
234  /* Create physical I/O buffer. Note we make this near on a PC. */
235  dest->samples_per_row = cinfo->output_width * cinfo->out_color_components;
236  dest->buffer_width = dest->samples_per_row * (BYTESPERSAMPLE * SIZEOF(char));
237  dest->iobuffer = (char *) (*cinfo->mem->alloc_small)
238  ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width);
239 
240  if (cinfo->quantize_colors || BITS_IN_JSAMPLE != 8 ||
241  SIZEOF(JSAMPLE) != SIZEOF(char)) {
242  /* When quantizing, we need an output buffer for colormap indexes
243  * that's separate from the physical I/O buffer. We also need a
244  * separate buffer if pixel format translation must take place.
245  */
246  dest->pub.buffer = (*cinfo->mem->alloc_sarray)
247  ((j_common_ptr) cinfo, JPOOL_IMAGE,
248  cinfo->output_width * cinfo->output_components, (JDIMENSION) 1);
249  dest->pub.buffer_height = 1;
250  if (! cinfo->quantize_colors)
251  dest->pub.put_pixel_rows = copy_pixel_rows;
252  else if (cinfo->out_color_space == JCS_GRAYSCALE)
253  dest->pub.put_pixel_rows = put_demapped_gray;
254  else
255  dest->pub.put_pixel_rows = put_demapped_rgb;
256  } else {
257  /* We will fwrite() directly from decompressor output buffer. */
258  /* Synthesize a JSAMPARRAY pointer structure */
259  /* Cast here implies near->far pointer conversion on PCs */
260  dest->pixrow = (JSAMPROW) dest->iobuffer;
261  dest->pub.buffer = & dest->pixrow;
262  dest->pub.buffer_height = 1;
263  dest->pub.put_pixel_rows = put_pixel_rows;
264  }
265 
266  return &dest->pub;
267 }
268 
269 #endif /* PPM_SUPPORTED */
#define BITS_IN_JSAMPLE
Definition: jmorecfg.h:33
char JSAMPLE
Definition: jmorecfg.h:74
struct png_info_def **typedef void(__cdecl typeof(png_destroy_read_struct))(struct png_struct_def **
Definition: typeof.h:49
JDIMENSION output_height
Definition: jpeglib.h:508
JSAMPLE FAR * JSAMPROW
Definition: jpeglib.h:75
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
struct jpeg_common_struct * j_common_ptr
Definition: jpeglib.h:284
boolean quantize_colors
Definition: jpeglib.h:491
#define GETJSAMPLE(value)
Definition: jmorecfg.h:78
JDIMENSION output_width
Definition: jpeglib.h:507
#define JFERROR(file)
Definition: jinclude.h:97
#define JFWRITE(file, buf, sizeofbuf)
Definition: jinclude.h:94
#define SIZEOF(_ar)
Definition: calc.h:97
jpeg_calc_output_dimensions(j_decompress_ptr cinfo)
Definition: jdmaster.c:101
#define JPOOL_IMAGE
Definition: jpeglib.h:808
_Check_return_opt_ _CRTIMP int __cdecl fprintf(_Inout_ FILE *_File, _In_z_ _Printf_format_string_ const char *_Format,...)
J_COLOR_SPACE out_color_space
Definition: jpeglib.h:478
static PVOID ptr
Definition: dispmode.c:27
#define JFFLUSH(file)
Definition: jinclude.h:96
FILE * output_file
Definition: cdjpeg.h:62
JSAMPARRAY colormap
Definition: jpeglib.h:527
#define GLOBAL(type)
Definition: jmorecfg.h:291
#define METHODDEF(type)
Definition: jmorecfg.h:287
unsigned int JDIMENSION
Definition: jmorecfg.h:229
static char * dest
Definition: rtl.c:135