src/common/imagjpeg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #if wxUSE_IMAGE && wxUSE_LIBJPEG
  18
  19 #include "wx/imagjpeg.h"
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/log.h"
  23     #include "wx/app.h"
  24     #include "wx/intl.h"
  25     #include "wx/bitmap.h"
  26     #include "wx/module.h"
  27 #endif
  28
  29 // A hack based on one from tif_jpeg.c to overcome the problem on Windows
  30 // of rpcndr.h defining boolean with a different type to the jpeg headers.
  31 //
  32 // This hack is only necessary for an external jpeg library, the builtin one
  33 // usually used on Windows doesn't use the type boolean, so always works.
  34 //
  35 #ifdef wxHACK_BOOLEAN
  36     #define HAVE_BOOLEAN
  37     #define boolean wxHACK_BOOLEAN
  38 #endif
  39
  40 extern "C"
  41 {
  42     #if defined(__WXMSW__)
  43         #define XMD_H
  44     #endif
  45     #include "jpeglib.h"
  46 }
  47
  48 #ifndef HAVE_WXJPEG_BOOLEAN
  49 typedef boolean wxjpeg_boolean;
  50 #endif
  51
  52 #include "wx/filefn.h"
  53 #include "wx/wfstream.h"
  54
  55 // For memcpy
  56 #include <string.h>
  57 // For JPEG library error handling
  58 #include <setjmp.h>
  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 } wx_source_mgr;
  96
  97 typedef wx_source_mgr * wx_src_ptr;
  98
  99 extern "C"
 100 {
 101
 102 CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
 103 {
 104 }
 105
 106 CPP_METHODDEF(wxjpeg_boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )
 107 {
 108     wx_src_ptr src = (wx_src_ptr) cinfo->src;
 109
 110     src->pub.next_input_byte = src->buffer;
 111     src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
 112
 113     if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
 114     {
 115         // Insert a fake EOI marker
 116         src->buffer[0] = 0xFF;
 117         src->buffer[1] = JPEG_EOI;
 118         src->pub.bytes_in_buffer = 2;
 119     }
 120     return TRUE;
 121 }
 122
 123 CPP_METHODDEF(void) wx_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
 124 {
 125     if (num_bytes > 0)
 126     {
 127         wx_src_ptr src = (wx_src_ptr) cinfo->src;
 128
 129         while (num_bytes > (long)src->pub.bytes_in_buffer)
 130         {
 131             num_bytes -= (long) src->pub.bytes_in_buffer;
 132             src->pub.fill_input_buffer(cinfo);
 133         }
 134         src->pub.next_input_byte += (size_t) num_bytes;
 135         src->pub.bytes_in_buffer -= (size_t) num_bytes;
 136     }
 137 }
 138
 139 CPP_METHODDEF(void) wx_term_source ( j_decompress_ptr cinfo )
 140 {
 141     wx_src_ptr src = (wx_src_ptr) cinfo->src;
 142
 143     if (src->pub.bytes_in_buffer > 0)
 144         src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
 145     delete[] src->buffer;
 146 }
 147
 148
 149 // JPEG error manager:
 150
 151 struct wx_error_mgr : public jpeg_error_mgr
 152 {
 153   jmp_buf setjmp_buffer;    /* for return to caller */
 154 };
 155
 156 /*
 157  * Here's the routine that will replace the standard error_exit method:
 158  */
 159
 160 CPP_METHODDEF(void) wx_error_exit (j_common_ptr cinfo)
 161 {
 162   /* cinfo->err really points to a wx_error_mgr struct, so coerce pointer */
 163   wx_error_mgr * const jerr = (wx_error_mgr *) cinfo->err;
 164
 165   /* Always display the message. */
 166   /* We could postpone this until after returning, if we chose. */
 167   (*cinfo->err->output_message) (cinfo);
 168
 169   /* Return control to the setjmp point */
 170   longjmp(jerr->setjmp_buffer, 1);
 171 }
 172
 173 /*
 174  * This will replace the standard output_message method when the user
 175  * wants us to be silent (verbose==false). We must have such method instead of
 176  * simply using NULL for cinfo->err->output_message because it's called
 177  * unconditionally from within libjpeg when there's "garbage input".
 178  */
 179 CPP_METHODDEF(void) wx_ignore_message (j_common_ptr WXUNUSED(cinfo))
 180 {
 181 }
 182
 183 void wx_jpeg_io_src( j_decompress_ptr cinfo, wxInputStream& infile )
 184 {
 185     wx_src_ptr src;
 186
 187     if (cinfo->src == NULL) {    /* first time for this JPEG object? */
 188         cinfo->src = (struct jpeg_source_mgr *)
 189             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 190             sizeof(wx_source_mgr));
 191     }
 192     src = (wx_src_ptr) cinfo->src;
 193     src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
 194     src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
 195     src->pub.next_input_byte = NULL; /* until buffer loaded */
 196     src->stream = &infile;
 197
 198     src->pub.init_source = wx_init_source;
 199     src->pub.fill_input_buffer = wx_fill_input_buffer;
 200     src->pub.skip_input_data = wx_skip_input_data;
 201     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 202     src->pub.term_source = wx_term_source;
 203 }
 204
 205 } // extern "C"
 206
 207 static inline void wx_cmyk_to_rgb(unsigned char* rgb, const unsigned char* cmyk)
 208 {
 209     register int k = 255 - cmyk[3];
 210     register int k2 = cmyk[3];
 211     register int c;
 212
 213     c = k + k2 * (255 - cmyk[0]) / 255;
 214     rgb[0] = (unsigned char)((c > 255) ? 0 : (255 - c));
 215
 216     c = k + k2 * (255 - cmyk[1]) / 255;
 217     rgb[1] = (unsigned char)((c > 255) ? 0 : (255 - c));
 218
 219     c = k + k2 * (255 - cmyk[2]) / 255;
 220     rgb[2] = (unsigned char)((c > 255) ? 0 : (255 - c));
 221 }
 222
 223 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 224 // C++ object destruction is non-portable) - I don't see any dtors here
 225 #ifdef __VISUALC__
 226     #pragma warning(disable:4611)
 227 #endif /* VC++ */
 228
 229 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 230 {
 231     wxCHECK_MSG( image, false, "NULL image pointer" );
 232
 233     struct jpeg_decompress_struct cinfo;
 234     wx_error_mgr jerr;
 235     unsigned char *ptr;
 236
 237     // save this before calling Destroy()
 238     const unsigned maxWidth = image->GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
 239                    maxHeight = image->GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
 240     image->Destroy();
 241
 242     cinfo.err = jpeg_std_error( &jerr );
 243     jerr.error_exit = wx_error_exit;
 244
 245     if (!verbose)
 246         cinfo.err->output_message = wx_ignore_message;
 247
 248     /* Establish the setjmp return context for wx_error_exit to use. */
 249     if (setjmp(jerr.setjmp_buffer)) {
 250       /* If we get here, the JPEG code has signaled an error.
 251        * We need to clean up the JPEG object, close the input file, and return.
 252        */
 253       if (verbose)
 254         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 255       (cinfo.src->term_source)(&cinfo);
 256       jpeg_destroy_decompress(&cinfo);
 257       if (image->Ok()) image->Destroy();
 258       return false;
 259     }
 260
 261     jpeg_create_decompress( &cinfo );
 262     wx_jpeg_io_src( &cinfo, stream );
 263     jpeg_read_header( &cinfo, TRUE );
 264
 265     int bytesPerPixel;
 266     if ((cinfo.out_color_space == JCS_CMYK) || (cinfo.out_color_space == JCS_YCCK))
 267     {
 268         cinfo.out_color_space = JCS_CMYK;
 269         bytesPerPixel = 4;
 270     }
 271     else // all the rest is treated as RGB
 272     {
 273         cinfo.out_color_space = JCS_RGB;
 274         bytesPerPixel = 3;
 275     }
 276
 277     // scale the picture to fit in the specified max size if necessary
 278     if ( maxWidth > 0 || maxHeight > 0 )
 279     {
 280         unsigned& scale = cinfo.scale_denom;
 281         while ( (maxWidth && (cinfo.image_width / scale > maxWidth)) ||
 282                     (maxHeight && (cinfo.image_height / scale > maxHeight)) )
 283         {
 284             scale *= 2;
 285         }
 286     }
 287
 288     jpeg_start_decompress( &cinfo );
 289
 290     image->Create( cinfo.output_width, cinfo.output_height );
 291     if (!image->Ok()) {
 292         jpeg_finish_decompress( &cinfo );
 293         jpeg_destroy_decompress( &cinfo );
 294         return false;
 295     }
 296     image->SetMask( false );
 297     ptr = image->GetData();
 298
 299     unsigned stride = cinfo.output_width * bytesPerPixel;
 300     JSAMPARRAY tempbuf = (*cinfo.mem->alloc_sarray)
 301                             ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 302
 303     while ( cinfo.output_scanline < cinfo.output_height )
 304     {
 305         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 306         if (cinfo.out_color_space == JCS_RGB)
 307         {
 308             memcpy( ptr, tempbuf[0], stride );
 309             ptr += stride;
 310         }
 311         else // CMYK
 312         {
 313             const unsigned char* inptr = (const unsigned char*) tempbuf[0];
 314             for (size_t i = 0; i < cinfo.output_width; i++)
 315             {
 316                 wx_cmyk_to_rgb(ptr, inptr);
 317                 ptr += 3;
 318                 inptr += 4;
 319             }
 320         }
 321     }
 322
 323     // set up resolution if available: it's part of optional JFIF APP0 chunk
 324     if ( cinfo.saw_JFIF_marker )
 325     {
 326         image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, cinfo.X_density);
 327         image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, cinfo.Y_density);
 328
 329         // we use the same values for this option as libjpeg so we don't need
 330         // any conversion here
 331         image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, cinfo.density_unit);
 332     }
 333
 334     jpeg_finish_decompress( &cinfo );
 335     jpeg_destroy_decompress( &cinfo );
 336     return true;
 337 }
 338
 339 typedef struct {
 340     struct jpeg_destination_mgr pub;
 341
 342     wxOutputStream *stream;
 343     JOCTET * buffer;
 344 } wx_destination_mgr;
 345
 346 typedef wx_destination_mgr * wx_dest_ptr;
 347
 348 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 349
 350 extern "C"
 351 {
 352
 353 CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
 354 {
 355     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 356
 357     /* Allocate the output buffer --- it will be released when done with image */
 358     dest->buffer = (JOCTET *)
 359         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 360         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 361     dest->pub.next_output_byte = dest->buffer;
 362     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 363 }
 364
 365 CPP_METHODDEF(wxjpeg_boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
 366 {
 367     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 368
 369     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 370     dest->pub.next_output_byte = dest->buffer;
 371     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 372     return TRUE;
 373 }
 374
 375 CPP_METHODDEF(void) wx_term_destination (j_compress_ptr cinfo)
 376 {
 377     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 378     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 379     /* Write any data remaining in the buffer */
 380     if (datacount > 0)
 381         dest->stream->Write(dest->buffer, datacount);
 382 }
 383
 384 GLOBAL(void) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 385 {
 386     wx_dest_ptr dest;
 387
 388     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 389         cinfo->dest = (struct jpeg_destination_mgr *)
 390             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 391             sizeof(wx_destination_mgr));
 392     }
 393
 394     dest = (wx_dest_ptr) cinfo->dest;
 395     dest->pub.init_destination = wx_init_destination;
 396     dest->pub.empty_output_buffer = wx_empty_output_buffer;
 397     dest->pub.term_destination = wx_term_destination;
 398     dest->stream = &outfile;
 399 }
 400
 401 } // extern "C"
 402
 403 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 404 {
 405     struct jpeg_compress_struct cinfo;
 406     wx_error_mgr jerr;
 407     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 408     JSAMPLE *image_buffer;
 409     int stride;                /* physical row width in image buffer */
 410
 411     cinfo.err = jpeg_std_error(&jerr);
 412     jerr.error_exit = wx_error_exit;
 413
 414     if (!verbose)
 415         cinfo.err->output_message = wx_ignore_message;
 416
 417     /* Establish the setjmp return context for wx_error_exit to use. */
 418     if (setjmp(jerr.setjmp_buffer))
 419     {
 420         /* If we get here, the JPEG code has signaled an error.
 421          * We need to clean up the JPEG object, close the input file, and return.
 422          */
 423          if (verbose)
 424             wxLogError(_("JPEG: Couldn't save image."));
 425          jpeg_destroy_compress(&cinfo);
 426          return false;
 427     }
 428
 429     jpeg_create_compress(&cinfo);
 430     wx_jpeg_io_dest(&cinfo, stream);
 431
 432     cinfo.image_width = image->GetWidth();
 433     cinfo.image_height = image->GetHeight();
 434     cinfo.input_components = 3;
 435     cinfo.in_color_space = JCS_RGB;
 436     jpeg_set_defaults(&cinfo);
 437
 438     // TODO: 3rd parameter is force_baseline, what value should this be?
 439     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 440     // are limited to 1..255 for JPEG baseline compatibility."
 441     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 442     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 443     // and force_baseline is TRUE.
 444     if (image->HasOption(wxIMAGE_OPTION_QUALITY))
 445         jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
 446
 447     // set the resolution fields in the output file
 448     int resX, resY;
 449     wxImageResolution res = GetResolutionFromOptions(*image, &resX, &resY);
 450     if ( res != wxIMAGE_RESOLUTION_NONE )
 451     {
 452         cinfo.X_density = resX;
 453         cinfo.Y_density = resY;
 454
 455         // it so happens that wxIMAGE_RESOLUTION_INCHES/CM values are the same
 456         // ones as used by libjpeg, so we can assign them directly
 457         cinfo.density_unit = res;
 458     }
 459
 460     jpeg_start_compress(&cinfo, TRUE);
 461
 462     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 463     image_buffer = image->GetData();
 464     while (cinfo.next_scanline < cinfo.image_height) {
 465         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 466         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 467     }
 468     jpeg_finish_compress(&cinfo);
 469     jpeg_destroy_compress(&cinfo);
 470
 471     return true;
 472 }
 473
 474 #ifdef __VISUALC__
 475     #pragma warning(default:4611)
 476 #endif /* VC++ */
 477
 478 bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 479 {
 480     unsigned char hdr[2];
 481
 482     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here
 483         return false;
 484
 485     return hdr[0] == 0xFF && hdr[1] == 0xD8;
 486 }
 487
 488 #endif   // wxUSE_STREAMS
 489
 490 #endif   // wxUSE_LIBJPEG