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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "imagjpeg.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18 #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_IMAGE && wxUSE_LIBJPEG
  24
  25 #include "wx/imagjpeg.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30
  31 // NB: Some compilers define boolean type in Windows headers
  32 //     (e.g. Watcom C++, but not Open Watcom).
  33 //     This causes a conflict with jmorecfg.h header from libjpeg, so we have
  34 //     to make sure libjpeg won't try to define boolean itself. This is done by
  35 //     defining HAVE_BOOLEAN.
  36 #if defined(__WXMSW__) && (defined(__MWERKS__) || defined(__DIGITALMARS__) || (defined(__WATCOMC__) && __WATCOMC__ < 1200))
  37     #define HAVE_BOOLEAN
  38     #include "wx/msw/wrapwin.h"
  39 #endif
  40
  41 extern "C"
  42 {
  43     #include "jpeglib.h"
  44 }
  45
  46 #include "wx/filefn.h"
  47 #include "wx/wfstream.h"
  48 #include "wx/intl.h"
  49 #include "wx/module.h"
  50
  51 // For memcpy
  52 #include <string.h>
  53 // For JPEG library error handling
  54 #include <setjmp.h>
  55
  56 #ifdef __SALFORDC__
  57 #undef FAR
  58 #endif
  59
  60 // ----------------------------------------------------------------------------
  61 // types
  62 // ----------------------------------------------------------------------------
  63
  64 // the standard definition of METHODDEF(type) from jmorecfg.h is "static type"
  65 // which means that we can't declare the method functions as extern "C" - the
  66 // compiler (rightfully) complains about the multiple storage classes in
  67 // declaration
  68 //
  69 // so we only add extern "C" when using our own, modified, jmorecfg.h - and use
  70 // whatever we have in the system headers if this is what we use hoping that it
  71 // should be ok (can't do anything else)
  72 #ifdef JPEG_METHOD_LINKAGE
  73     #define CPP_METHODDEF(type) extern "C" METHODDEF(type)
  74 #else // not using our jmorecfg.h header
  75     #define CPP_METHODDEF(type) METHODDEF(type)
  76 #endif
  77
  78 //-----------------------------------------------------------------------------
  79 // wxJPEGHandler
  80 //-----------------------------------------------------------------------------
  81
  82 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
  83
  84 #if wxUSE_STREAMS
  85
  86 //------------- JPEG Data Source Manager
  87
  88 #define JPEG_IO_BUFFER_SIZE   2048
  89
  90 typedef struct {
  91     struct jpeg_source_mgr pub;   /* public fields */
  92
  93     JOCTET* buffer;               /* start of buffer */
  94     wxInputStream *stream;
  95 } my_source_mgr;
  96
  97 typedef my_source_mgr * my_src_ptr;
  98
  99 CPP_METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
 100 {
 101 }
 102
 103 CPP_METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
 104 {
 105     my_src_ptr src = (my_src_ptr) cinfo->src;
 106
 107     src->pub.next_input_byte = src->buffer;
 108     src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
 109
 110     if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
 111     {
 112         // Insert a fake EOI marker
 113         src->buffer[0] = 0xFF;
 114         src->buffer[1] = JPEG_EOI;
 115         src->pub.bytes_in_buffer = 2;
 116     }
 117     return TRUE;
 118 }
 119
 120 CPP_METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
 121 {
 122     if (num_bytes > 0)
 123     {
 124         my_src_ptr src = (my_src_ptr) cinfo->src;
 125
 126         while (num_bytes > (long)src->pub.bytes_in_buffer)
 127         {
 128             num_bytes -= (long) src->pub.bytes_in_buffer;
 129             src->pub.fill_input_buffer(cinfo);
 130         }
 131         src->pub.next_input_byte += (size_t) num_bytes;
 132         src->pub.bytes_in_buffer -= (size_t) num_bytes;
 133     }
 134 }
 135
 136 CPP_METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
 137 {
 138     my_src_ptr src = (my_src_ptr) cinfo->src;
 139
 140     if (src->pub.bytes_in_buffer > 0)
 141         src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
 142     delete[] src->buffer;
 143 }
 144
 145
 146 // JPEG error manager:
 147
 148 struct my_error_mgr {
 149   struct jpeg_error_mgr pub;    /* "public" fields */
 150
 151   jmp_buf setjmp_buffer;    /* for return to caller */
 152 };
 153
 154 typedef struct my_error_mgr * my_error_ptr;
 155
 156 /*
 157  * Here's the routine that will replace the standard error_exit method:
 158  */
 159
 160 CPP_METHODDEF(void) my_error_exit (j_common_ptr cinfo)
 161 {
 162   /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
 163   my_error_ptr myerr = (my_error_ptr) cinfo->err;
 164
 165   /* Always display the message. */
 166   /* We could postpone this until after returning, if we chose. */
 167   if (cinfo->err->output_message) (*cinfo->err->output_message) (cinfo);
 168
 169   /* Return control to the setjmp point */
 170   longjmp(myerr->setjmp_buffer, 1);
 171 }
 172
 173 void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
 174 {
 175     my_src_ptr src;
 176
 177     if (cinfo->src == NULL) {    /* first time for this JPEG object? */
 178         cinfo->src = (struct jpeg_source_mgr *)
 179             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 180             sizeof(my_source_mgr));
 181         src = (my_src_ptr) cinfo->src;
 182     }
 183     src = (my_src_ptr) cinfo->src;
 184     src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
 185     src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
 186     src->pub.next_input_byte = NULL; /* until buffer loaded */
 187     src->stream = &infile;
 188
 189     src->pub.init_source = my_init_source;
 190     src->pub.fill_input_buffer = my_fill_input_buffer;
 191     src->pub.skip_input_data = my_skip_input_data;
 192     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 193     src->pub.term_source = my_term_source;
 194 }
 195
 196
 197 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 198 // C++ object destruction is non-portable) - I don't see any dtors here
 199 #ifdef __VISUALC__
 200     #pragma warning(disable:4611)
 201 #endif /* VC++ */
 202
 203 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 204 {
 205     struct jpeg_decompress_struct cinfo;
 206     struct my_error_mgr jerr;
 207     JSAMPARRAY tempbuf;
 208     unsigned char *ptr;
 209     unsigned stride;
 210
 211     image->Destroy();
 212     cinfo.err = jpeg_std_error( &jerr.pub );
 213     jerr.pub.error_exit = my_error_exit;
 214
 215     if (!verbose) cinfo.err->output_message=NULL;
 216
 217     /* Establish the setjmp return context for my_error_exit to use. */
 218     if (setjmp(jerr.setjmp_buffer)) {
 219       /* If we get here, the JPEG code has signaled an error.
 220        * We need to clean up the JPEG object, close the input file, and return.
 221        */
 222       if (verbose)
 223         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 224       (cinfo.src->term_source)(&cinfo);
 225       jpeg_destroy_decompress(&cinfo);
 226       if (image->Ok()) image->Destroy();
 227       return FALSE;
 228     }
 229
 230     jpeg_create_decompress( &cinfo );
 231     jpeg_wxio_src( &cinfo, stream );
 232     jpeg_read_header( &cinfo, TRUE );
 233     cinfo.out_color_space = JCS_RGB;
 234     jpeg_start_decompress( &cinfo );
 235
 236     image->Create( cinfo.image_width, cinfo.image_height );
 237     if (!image->Ok()) {
 238         jpeg_finish_decompress( &cinfo );
 239         jpeg_destroy_decompress( &cinfo );
 240         return FALSE;
 241     }
 242     image->SetMask( FALSE );
 243     ptr = image->GetData();
 244     stride = cinfo.output_width * 3;
 245     tempbuf = (*cinfo.mem->alloc_sarray)
 246         ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 247
 248     while ( cinfo.output_scanline < cinfo.output_height ) {
 249         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 250         memcpy( ptr, tempbuf[0], stride );
 251         ptr += stride;
 252     }
 253     jpeg_finish_decompress( &cinfo );
 254     jpeg_destroy_decompress( &cinfo );
 255     return TRUE;
 256 }
 257
 258 typedef struct {
 259     struct jpeg_destination_mgr pub;
 260
 261     wxOutputStream *stream;
 262     JOCTET * buffer;
 263 } my_destination_mgr;
 264
 265 typedef my_destination_mgr * my_dest_ptr;
 266
 267 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 268
 269 CPP_METHODDEF(void) init_destination (j_compress_ptr cinfo)
 270 {
 271     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 272
 273     /* Allocate the output buffer --- it will be released when done with image */
 274     dest->buffer = (JOCTET *)
 275         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 276         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 277     dest->pub.next_output_byte = dest->buffer;
 278     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 279 }
 280
 281 CPP_METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
 282 {
 283     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 284
 285     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 286     dest->pub.next_output_byte = dest->buffer;
 287     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 288     return TRUE;
 289 }
 290
 291 CPP_METHODDEF(void) term_destination (j_compress_ptr cinfo)
 292 {
 293     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 294     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 295     /* Write any data remaining in the buffer */
 296     if (datacount > 0)
 297         dest->stream->Write(dest->buffer, datacount);
 298 }
 299
 300 GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 301 {
 302     my_dest_ptr dest;
 303
 304     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 305         cinfo->dest = (struct jpeg_destination_mgr *)
 306             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 307             sizeof(my_destination_mgr));
 308     }
 309
 310     dest = (my_dest_ptr) cinfo->dest;
 311     dest->pub.init_destination = init_destination;
 312     dest->pub.empty_output_buffer = empty_output_buffer;
 313     dest->pub.term_destination = term_destination;
 314     dest->stream = &outfile;
 315 }
 316
 317 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 318 {
 319     struct jpeg_compress_struct cinfo;
 320     struct my_error_mgr jerr;
 321     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 322     JSAMPLE *image_buffer;
 323     int stride;                /* physical row width in image buffer */
 324
 325     cinfo.err = jpeg_std_error(&jerr.pub);
 326     jerr.pub.error_exit = my_error_exit;
 327
 328     if (!verbose) cinfo.err->output_message=NULL;
 329
 330     /* Establish the setjmp return context for my_error_exit to use. */
 331     if (setjmp(jerr.setjmp_buffer))
 332     {
 333         /* If we get here, the JPEG code has signaled an error.
 334          * We need to clean up the JPEG object, close the input file, and return.
 335          */
 336          if (verbose)
 337             wxLogError(_("JPEG: Couldn't save image."));
 338          jpeg_destroy_compress(&cinfo);
 339          return FALSE;
 340     }
 341
 342     jpeg_create_compress(&cinfo);
 343     jpeg_wxio_dest(&cinfo, stream);
 344
 345     cinfo.image_width = image->GetWidth();
 346     cinfo.image_height = image->GetHeight();
 347     cinfo.input_components = 3;
 348     cinfo.in_color_space = JCS_RGB;
 349     jpeg_set_defaults(&cinfo);
 350
 351     // TODO: 3rd parameter is force_baseline, what value should this be?
 352     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 353     // are limited to 1..255 for JPEG baseline compatibility."
 354     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 355     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 356     // and force_baseline is TRUE.
 357     if (image->HasOption(wxT("quality")))
 358         jpeg_set_quality(&cinfo, image->GetOptionInt(wxT("quality")), TRUE);
 359
 360     jpeg_start_compress(&cinfo, TRUE);
 361
 362     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 363     image_buffer = image->GetData();
 364     while (cinfo.next_scanline < cinfo.image_height) {
 365         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 366         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 367     }
 368     jpeg_finish_compress(&cinfo);
 369     jpeg_destroy_compress(&cinfo);
 370
 371     return TRUE;
 372 }
 373
 374 #ifdef __VISUALC__
 375     #pragma warning(default:4611)
 376 #endif /* VC++ */
 377
 378 bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 379 {
 380     unsigned char hdr[2];
 381
 382     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
 383         return FALSE;
 384
 385     return hdr[0] == 0xFF && hdr[1] == 0xD8;
 386 }
 387
 388 #endif   // wxUSE_STREAMS
 389
 390 #endif   // wxUSE_LIBJPEG
 391
 392
 393
 394
 395
 396