source: golgotha/src/i4/loaders/jpg_load.hh @ 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: 4.0 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#ifndef _JPG_LOAD_HH_
10#define _JPG_LOAD_HH_
11
12//#define JPEG_INTERNALS
13//TODO clean up memory management
14//convert types and memory and file stuff to I4
15#include "file/buf_file.hh"
16#include "loaders/load.hh"
17#include "image/image.hh"
18#include "loaders/jpg/cdjpeg.h"         /* Common decls for cjpeg/djpeg applications */
19#include "loaders/jpg/jversion.h"               /* for version message */
20#include "status/status.hh"
21#include "image/image.hh"
22
23#include <ctype.h>              /* to declare isprint() */
24
25static const char * const cdjpeg_message_table[] = {
26#include "loaders/jpg/cderror.h"
27  NULL
28};
29
30static inline w32 read_colorbgr(w8 *cp)
31{
32  w8 buf[4];
33
34  *(w32 *)buf=*((w32 *)cp);
35//  if (!buf[3]) return 0;
36  return (((w32)buf[0]<<16) |
37              ((w32)buf[1]<<8)  |
38              ((w32)buf[2]));
39}
40
41LOCAL(unsigned int)
42jpeg_getc (j_decompress_ptr cinfo)
43/* Read next byte */
44{
45  struct jpeg_source_mgr * datasrc = cinfo->src;
46
47  if (datasrc->bytes_in_buffer == 0) {
48    if (! (*datasrc->fill_input_buffer) (cinfo))
49      ERREXIT(cinfo, JERR_CANT_SUSPEND);
50  }
51  datasrc->bytes_in_buffer--;
52  return GETJOCTET(*datasrc->next_input_byte++);
53}
54
55METHODDEF(boolean)
56COM_handler (j_decompress_ptr cinfo)
57{
58  boolean traceit = (cinfo->err->trace_level >= 1);
59  INT32 length;
60  unsigned int ch;
61  unsigned int lastch = 0;
62
63  length = jpeg_getc(cinfo) << 8;
64  length += jpeg_getc(cinfo);
65  length -= 2;                  /* discount the length word itself */
66
67  if (traceit)
68    fprintf(stderr, "Comment, length %ld:\n", (long) length);
69
70  while (--length >= 0) {
71    ch = jpeg_getc(cinfo);
72    if (traceit) {
73      /* Emit the character in a readable form.
74       * Nonprintables are converted to \nnn form,
75       * while \ is converted to \\.
76       * Newlines in CR, CR/LF, or LF form will be printed as one newline.
77       */
78      if (ch == '\r') {
79        fprintf(stderr, "\n");
80      } else if (ch == '\n') {
81        if (lastch != '\r')
82          fprintf(stderr, "\n");
83      } else if (ch == '\\') {
84        fprintf(stderr, "\\\\");
85      } else if (isprint(ch)) {
86        putc(ch, stderr);
87      } else {
88        fprintf(stderr, "\\%03o", ch);
89      }
90      lastch = ch;
91    }
92  }
93
94  if (traceit)
95    fprintf(stderr, "\n");
96
97  return TRUE;
98}
99
100class i4_jpg_loader_class : public i4_image_loader_class
101{
102  public :
103  // returns the maximum size you need to identify your file format
104  virtual w16 max_header_size() { return 10; }
105  virtual i4_bool recognize_header(w8 *buf)
106  {
107          if(buf[0]==0xff &&    //marker
108                  buf[1]==0xd8 &&  //soi seg
109                  buf[2]==0xff &&       //marker
110                  buf[3]==0xe0 &&       //app0 seg
111                  buf[6]=='J' && buf[7]=='F' &&
112                  buf[8]=='I' && buf[9]=='F')
113                  return i4_T;
114          else return i4_F;
115  }
116
117  i4_bool special_load24(i4_file_class *fp,w8 *dst_texture, sw32 *dst_width, sw32 *dst_height);
118
119  i4_bool special_load16(i4_file_class *fp,
120                         w16 *dst_texture,
121                         sw32 base_width,
122                         const i4_pal *pal);
123
124  i4_bool convert_to_raw16(i4_file_class *fp,
125                           FILE *dst_file,
126                           i4_status_class *status,
127                           const i4_pal *pal,
128                           sw32 expected_width,
129                           sw32 expected_height);
130
131  // assume fp is at the start of the file
132  virtual i4_image_class *load(i4_file_class *fp,
133                               i4_status_class *status);
134 
135  struct jpeg_decompress_struct cinfo;
136  struct jpeg_error_mgr jerr;
137
138};
139
140extern i4_jpg_loader_class i4_jpg_loader_instance;
141
142#endif
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