src/common/imagjpeg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        imagjpeg.cpp
   3 // Purpose:     wxImage JPEG handler
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 /*
  11    We don't put pragma implement in this file because it is already present in
  12    src/common/image.cpp
  13
  14 #ifdef __GNUG__
  15 #pragma implementation "image.h"
  16 #endif
  17 */
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23 #pragma hdrstop
  24 #endif
  25
  26 #include "wx/image.h"
  27 #include "wx/bitmap.h"
  28 #include "wx/debug.h"
  29 #include "wx/log.h"
  30 #include "wx/app.h"
  31 #if wxUSE_LIBJPEG
  32 extern "C" {
  33 #include "../jpeg/jpeglib.h"
  34 }
  35 #endif
  36 #include "wx/filefn.h"
  37 #include "wx/wfstream.h"
  38 #include "wx/intl.h"
  39 #include "wx/module.h"
  40
  41 // For memcpy
  42 #include <string.h>
  43 // For JPEG library error handling
  44 #include <setjmp.h>
  45
  46 #ifdef __SALFORDC__
  47 #ifdef FAR
  48 #undef FAR
  49 #endif
  50 #endif
  51
  52 #ifdef __WXMSW__
  53 #include <windows.h>
  54 #endif
  55
  56 //-----------------------------------------------------------------------------
  57 // wxJPEGHandler
  58 //-----------------------------------------------------------------------------
  59
  60 #if wxUSE_LIBJPEG
  61
  62 #if !USE_SHARED_LIBRARIES
  63 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
  64 #endif
  65
  66 #if wxUSE_STREAMS
  67
  68
  69 //------------- JPEG Data Source Manager
  70
  71 typedef struct {
  72     struct jpeg_source_mgr pub;   /* public fields */
  73
  74     JOCTET* buffer;               /* start of buffer */
  75 } my_source_mgr;
  76
  77 typedef my_source_mgr * my_src_ptr;
  78
  79 METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
  80 {
  81 }
  82
  83 METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr WXUNUSED(cinfo) )
  84 {
  85     return TRUE;
  86 }
  87
  88 METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
  89 {
  90     my_src_ptr src = (my_src_ptr) cinfo->src;
  91
  92     src->pub.next_input_byte += (size_t) num_bytes;
  93     src->pub.bytes_in_buffer -= (size_t) num_bytes;
  94 }
  95
  96 METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
  97 {
  98     my_src_ptr src = (my_src_ptr) cinfo->src;
  99
 100     free (src->buffer);
 101 }
 102
 103 void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
 104 {
 105     my_src_ptr src;
 106
 107     if (cinfo->src == NULL) {   /* first time for this JPEG object? */
 108         cinfo->src = (struct jpeg_source_mgr *)
 109             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 110             sizeof(my_source_mgr));
 111         src = (my_src_ptr) cinfo->src;
 112     }
 113     src = (my_src_ptr) cinfo->src;
 114     src->pub.bytes_in_buffer = infile.StreamSize(); /* forces fill_input_buffer on first read */
 115     src->buffer = (JOCTET *) malloc (infile.StreamSize());
 116     src->pub.next_input_byte = src->buffer; /* until buffer loaded */
 117     infile.Read(src->buffer, infile.StreamSize());
 118
 119     src->pub.init_source = my_init_source;
 120     src->pub.fill_input_buffer = my_fill_input_buffer;
 121     src->pub.skip_input_data = my_skip_input_data;
 122     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 123     src->pub.term_source = my_term_source;
 124 }
 125
 126
 127 // JPEG error manager:
 128
 129 struct my_error_mgr {
 130   struct jpeg_error_mgr pub;    /* "public" fields */
 131
 132   jmp_buf setjmp_buffer;        /* for return to caller */
 133 };
 134
 135 typedef struct my_error_mgr * my_error_ptr;
 136
 137 /*
 138  * Here's the routine that will replace the standard error_exit method:
 139  */
 140
 141 METHODDEF(void)
 142 my_error_exit (j_common_ptr cinfo)
 143 {
 144   /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
 145   my_error_ptr myerr = (my_error_ptr) cinfo->err;
 146
 147   /* Always display the message. */
 148   /* We could postpone this until after returning, if we chose. */
 149   (*cinfo->err->output_message) (cinfo);
 150
 151   /* Return control to the setjmp point */
 152   longjmp(myerr->setjmp_buffer, 1);
 153 }
 154
 155
 156
 157 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream )
 158 {
 159     struct jpeg_decompress_struct cinfo;
 160     struct my_error_mgr jerr;
 161     JSAMPARRAY tempbuf;
 162     unsigned char *ptr;
 163     unsigned stride;
 164
 165     image->Destroy();
 166     cinfo.err = jpeg_std_error( &jerr.pub );
 167     jerr.pub.error_exit = my_error_exit;
 168
 169     /* Establish the setjmp return context for my_error_exit to use. */
 170     if (setjmp(jerr.setjmp_buffer)) {
 171       /* If we get here, the JPEG code has signaled an error.
 172        * We need to clean up the JPEG object, close the input file, and return.
 173        */
 174       wxLogError(_("Couldn't load a JPEG image - probably file is corrupted."));
 175       jpeg_destroy_decompress(&cinfo);
 176       if (image->Ok()) image->Destroy();
 177       return FALSE;
 178     }
 179
 180     jpeg_create_decompress( &cinfo );
 181     jpeg_wxio_src( &cinfo, stream );
 182     jpeg_read_header( &cinfo, TRUE );
 183     cinfo.out_color_space = JCS_RGB;
 184     jpeg_start_decompress( &cinfo );
 185
 186     image->Create( cinfo.image_width, cinfo.image_height );
 187     if (!image->Ok()) {
 188         jpeg_finish_decompress( &cinfo );
 189         jpeg_destroy_decompress( &cinfo );
 190         return FALSE;
 191     }
 192     image->SetMask( FALSE );
 193     ptr = image->GetData();
 194     stride = cinfo.output_width * 3;
 195     tempbuf = (*cinfo.mem->alloc_sarray)
 196         ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 197
 198     while ( cinfo.output_scanline < cinfo.output_height ) {
 199         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 200         memcpy( ptr, tempbuf[0], stride );
 201         ptr += stride;
 202     }
 203     jpeg_finish_decompress( &cinfo );
 204     jpeg_destroy_decompress( &cinfo );
 205     return TRUE;
 206 }
 207
 208
 209
 210
 211
 212 typedef struct {
 213     struct jpeg_destination_mgr pub;
 214
 215     wxOutputStream *stream;
 216     JOCTET * buffer;
 217 } my_destination_mgr;
 218
 219 typedef my_destination_mgr * my_dest_ptr;
 220
 221 #define OUTPUT_BUF_SIZE  4096   /* choose an efficiently fwrite'able size */
 222
 223 METHODDEF(void) init_destination (j_compress_ptr cinfo)
 224 {
 225     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 226
 227     /* Allocate the output buffer --- it will be released when done with image */
 228     dest->buffer = (JOCTET *)
 229         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 230         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 231     dest->pub.next_output_byte = dest->buffer;
 232     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 233 }
 234
 235 METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
 236 {
 237     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 238
 239     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 240     dest->pub.next_output_byte = dest->buffer;
 241     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 242     return TRUE;
 243 }
 244
 245 METHODDEF(void) term_destination (j_compress_ptr cinfo)
 246 {
 247     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 248     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 249     /* Write any data remaining in the buffer */
 250     if (datacount > 0)
 251         dest->stream->Write(dest->buffer, datacount);
 252 }
 253
 254 GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 255 {
 256     my_dest_ptr dest;
 257
 258     if (cinfo->dest == NULL) {  /* first time for this JPEG object? */
 259         cinfo->dest = (struct jpeg_destination_mgr *)
 260             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 261             sizeof(my_destination_mgr));
 262     }
 263
 264     dest = (my_dest_ptr) cinfo->dest;
 265     dest->pub.init_destination = init_destination;
 266     dest->pub.empty_output_buffer = empty_output_buffer;
 267     dest->pub.term_destination = term_destination;
 268     dest->stream = &outfile;
 269 }
 270
 271 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
 272 {
 273     struct jpeg_compress_struct cinfo;
 274     struct my_error_mgr jerr;
 275     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 276     JSAMPLE *image_buffer;
 277     int stride;                 /* physical row width in image buffer */
 278
 279     cinfo.err = jpeg_std_error(&jerr.pub);
 280     jerr.pub.error_exit = my_error_exit;
 281
 282     /* Establish the setjmp return context for my_error_exit to use. */
 283     if (setjmp(jerr.setjmp_buffer)) {
 284       /* If we get here, the JPEG code has signaled an error.
 285        * We need to clean up the JPEG object, close the input file, and return.
 286        */
 287       wxLogError(_("Couldn't save a JPEG image - probably file is corrupted."));
 288       jpeg_destroy_compress(&cinfo);
 289       return FALSE;
 290     }
 291
 292     jpeg_create_compress(&cinfo);
 293     jpeg_wxio_dest(&cinfo, stream);
 294
 295     cinfo.image_width = image->GetWidth();
 296     cinfo.image_height = image->GetHeight();
 297     cinfo.input_components = 3;
 298     cinfo.in_color_space = JCS_RGB;
 299     jpeg_set_defaults(&cinfo);
 300     jpeg_start_compress(&cinfo, TRUE);
 301
 302     stride = cinfo.image_width * 3;     /* JSAMPLEs per row in image_buffer */
 303     image_buffer = image->GetData();
 304     while (cinfo.next_scanline < cinfo.image_height) {
 305         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 306         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 307     }
 308     jpeg_finish_compress(&cinfo);
 309     jpeg_destroy_compress(&cinfo);
 310
 311     return TRUE;
 312 }
 313 #endif // wxUSE_STREAMS
 314
 315 #endif
 316
 317 // wxUSE_LIBJPEG
 318
 319
 320
 321
 322
 323
 324