source: golgotha/src/i4/loaders/jpg/wrtarga.cc @ 80

Last change on this file since 80 was 80, checked in by Sam Hocevar, 11 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
File size: 8.1 KB
Line 
1/********************************************************************** <BR>
2  This file is part of Crack dot Com's free source code release of
3  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
4  information about compiling & licensing issues visit this URL</a>
5  <PRE> If that doesn't help, contact Jonathan Clark at
6  golgotha_source@usa.net (Subject should have "GOLG" in it)
7***********************************************************************/
8
9/*
10 * wrtarga.c
11 *
12 * Copyright (C) 1991-1996, Thomas G. Lane.
13 * This file is part of the Independent JPEG Group's software.
14 * For conditions of distribution and use, see the accompanying README file.
15 *
16 * This file contains routines to write output images in Targa format.
17 *
18 * These routines may need modification for non-Unix environments or
19 * specialized applications.  As they stand, they assume output to
20 * an ordinary stdio stream.
21 *
22 * Based on code contributed by Lee Daniel Crocker.
23 */
24
25#include "loaders/jpg/cdjpeg.h"         /* Common decls for cjpeg/djpeg applications */
26
27#ifdef TARGA_SUPPORTED
28
29
30/*
31 * To support 12-bit JPEG data, we'd have to scale output down to 8 bits.
32 * This is not yet implemented.
33 */
34
35#if BITS_IN_JSAMPLE != 8
36  Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */
37#endif
38
39/*
40 * The output buffer needs to be writable by fwrite().  On PCs, we must
41 * allocate the buffer in near data space, because we are assuming small-data
42 * memory model, wherein fwrite() can't reach far memory.  If you need to
43 * process very wide images on a PC, you might have to compile in large-memory
44 * model, or else replace fwrite() with a putc() loop --- which will be much
45 * slower.
46 */
47
48
49/* Private version of data destination object */
50
51typedef struct {
52  struct djpeg_dest_struct pub; /* public fields */
53
54  char *iobuffer;               /* physical I/O buffer */
55  JDIMENSION buffer_width;      /* width of one row */
56} tga_dest_struct;
57
58typedef tga_dest_struct * tga_dest_ptr;
59
60
61LOCAL(void)
62write_header (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, int num_colors)
63/* Create and write a Targa header */
64{
65  char targaheader[18];
66
67  /* Set unused fields of header to 0 */
68  MEMZERO(targaheader, SIZEOF(targaheader));
69
70  if (num_colors > 0) {
71    targaheader[1] = 1;         /* color map type 1 */
72    targaheader[5] = (char) (num_colors & 0xFF);
73    targaheader[6] = (char) (num_colors >> 8);
74    targaheader[7] = 24;        /* 24 bits per cmap entry */
75  }
76
77  targaheader[12] = (char) (cinfo->output_width & 0xFF);
78  targaheader[13] = (char) (cinfo->output_width >> 8);
79  targaheader[14] = (char) (cinfo->output_height & 0xFF);
80  targaheader[15] = (char) (cinfo->output_height >> 8);
81  targaheader[17] = 0x20;       /* Top-down, non-interlaced */
82
83  if (cinfo->out_color_space == JCS_GRAYSCALE) {
84    targaheader[2] = 3;         /* image type = uncompressed gray-scale */
85    targaheader[16] = 8;        /* bits per pixel */
86  } else {                      /* must be RGB */
87    if (num_colors > 0) {
88      targaheader[2] = 1;       /* image type = colormapped RGB */
89      targaheader[16] = 8;
90    } else {
91      targaheader[2] = 2;       /* image type = uncompressed RGB */
92      targaheader[16] = 24;
93    }
94  }
95
96  if (JFWRITE(dinfo->output_file, targaheader, 18) != (size_t) 18)
97    ERREXIT(cinfo, JERR_FILE_WRITE);
98}
99
100
101/*
102 * Write some pixel data.
103 * In this module rows_supplied will always be 1.
104 */
105
106METHODDEF(void)
107put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
108                JDIMENSION rows_supplied)
109/* used for unquantized full-color output */
110{
111  tga_dest_ptr dest = (tga_dest_ptr) dinfo;
112  register JSAMPROW inptr;
113  register char * outptr;
114  register JDIMENSION col;
115
116  inptr = dest->pub.buffer[0];
117  outptr = dest->iobuffer;
118  for (col = cinfo->output_width; col > 0; col--) {
119    outptr[0] = (char) GETJSAMPLE(inptr[2]); /* RGB to BGR order */
120    outptr[1] = (char) GETJSAMPLE(inptr[1]);
121    outptr[2] = (char) GETJSAMPLE(inptr[0]);
122    inptr += 3, outptr += 3;
123  }
124  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
125}
126
127METHODDEF(void)
128put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
129               JDIMENSION rows_supplied)
130/* used for grayscale OR quantized color output */
131{
132  tga_dest_ptr dest = (tga_dest_ptr) dinfo;
133  register JSAMPROW inptr;
134  register char * outptr;
135  register JDIMENSION col;
136
137  inptr = dest->pub.buffer[0];
138  outptr = dest->iobuffer;
139  for (col = cinfo->output_width; col > 0; col--) {
140    *outptr++ = (char) GETJSAMPLE(*inptr++);
141  }
142  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
143}
144
145
146/*
147 * Write some demapped pixel data when color quantization is in effect.
148 * For Targa, this is only applied to grayscale data.
149 */
150
151METHODDEF(void)
152put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
153                   JDIMENSION rows_supplied)
154{
155  tga_dest_ptr dest = (tga_dest_ptr) dinfo;
156  register JSAMPROW inptr;
157  register char * outptr;
158  register JSAMPROW color_map0 = cinfo->colormap[0];
159  register JDIMENSION col;
160
161  inptr = dest->pub.buffer[0];
162  outptr = dest->iobuffer;
163  for (col = cinfo->output_width; col > 0; col--) {
164    *outptr++ = (char) GETJSAMPLE(color_map0[GETJSAMPLE(*inptr++)]);
165  }
166  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
167}
168
169
170/*
171 * Startup: write the file header.
172 */
173
174METHODDEF(void)
175start_output_tga (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
176{
177  tga_dest_ptr dest = (tga_dest_ptr) dinfo;
178  int num_colors, i;
179  FILE *outfile;
180
181  if (cinfo->out_color_space == JCS_GRAYSCALE) {
182    /* Targa doesn't have a mapped grayscale format, so we will */
183    /* demap quantized gray output.  Never emit a colormap. */
184    write_header(cinfo, dinfo, 0);
185    if (cinfo->quantize_colors)
186      dest->pub.put_pixel_rows = put_demapped_gray;
187    else
188      dest->pub.put_pixel_rows = put_gray_rows;
189  } else if (cinfo->out_color_space == JCS_RGB) {
190    if (cinfo->quantize_colors) {
191      /* We only support 8-bit colormap indexes, so only 256 colors */
192      num_colors = cinfo->actual_number_of_colors;
193      if (num_colors > 256)
194        ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, num_colors);
195      write_header(cinfo, dinfo, num_colors);
196      /* Write the colormap.  Note Targa uses BGR byte order */
197      outfile = dest->pub.output_file;
198      for (i = 0; i < num_colors; i++) {
199        putc(GETJSAMPLE(cinfo->colormap[2][i]), outfile);
200        putc(GETJSAMPLE(cinfo->colormap[1][i]), outfile);
201        putc(GETJSAMPLE(cinfo->colormap[0][i]), outfile);
202      }
203      dest->pub.put_pixel_rows = put_gray_rows;
204    } else {
205      write_header(cinfo, dinfo, 0);
206      dest->pub.put_pixel_rows = put_pixel_rows;
207    }
208  } else {
209    ERREXIT(cinfo, JERR_TGA_COLORSPACE);
210  }
211}
212
213
214/*
215 * Finish up at the end of the file.
216 */
217
218METHODDEF(void)
219finish_output_tga (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
220{
221  /* Make sure we wrote the output file OK */
222  fflush(dinfo->output_file);
223  if (ferror(dinfo->output_file))
224    ERREXIT(cinfo, JERR_FILE_WRITE);
225}
226
227
228/*
229 * The module selection routine for Targa format output.
230 */
231
232GLOBAL(djpeg_dest_ptr)
233jinit_write_targa (j_decompress_ptr cinfo)
234{
235  tga_dest_ptr dest;
236
237  /* Create module interface object, fill in method pointers */
238  dest = (tga_dest_ptr)
239      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
240                                  SIZEOF(tga_dest_struct));
241  dest->pub.start_output = start_output_tga;
242  dest->pub.finish_output = finish_output_tga;
243
244  /* Calculate output image dimensions so we can allocate space */
245  jpeg_calc_output_dimensions(cinfo);
246
247  /* Create I/O buffer.  Note we make this near on a PC. */
248  dest->buffer_width = cinfo->output_width * cinfo->output_components;
249  dest->iobuffer = (char *)
250    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
251                                (size_t) (dest->buffer_width * SIZEOF(char)));
252
253  /* Create decompressor output buffer. */
254  dest->pub.buffer = (*cinfo->mem->alloc_sarray)
255    ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width, (JDIMENSION) 1);
256  dest->pub.buffer_height = 1;
257
258  return (djpeg_dest_ptr) dest;
259}
260
261#endif /* TARGA_SUPPORTED */
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