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 #endif
  26
  27 #include "wx/bitmap.h"
  28
  29 // NB: Some compilers define boolean type in Windows headers
  30 //     (e.g. Watcom C++, but not Open Watcom).
  31 //     This causes a conflict with jmorecfg.h header from libjpeg, so we have
  32 //     to make sure libjpeg won't try to define boolean itself. This is done by
  33 //     defining HAVE_BOOLEAN.
  34 #if defined(__WXMSW__) && (defined(__MWERKS__) || defined(__DIGITALMARS__))
  35     #define HAVE_BOOLEAN
  36     #include "wx/msw/wrapwin.h"
  37 #endif
  38
  39 extern "C"
  40 {
  41     #if defined(__WXMSW__)
  42         #define XMD_H
  43     #endif
  44     #include "jpeglib.h"
  45 }
  46
  47 #include "wx/filefn.h"
  48 #include "wx/wfstream.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 } wx_source_mgr;
  96
  97 typedef wx_source_mgr * wx_src_ptr;
  98
  99 CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
 100 {
 101 }
 102
 103 CPP_METHODDEF(boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )
 104 {
 105     wx_src_ptr src = (wx_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) wx_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
 121 {
 122     if (num_bytes > 0)
 123     {
 124         wx_src_ptr src = (wx_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) wx_term_source ( j_decompress_ptr cinfo )
 137 {
 138     wx_src_ptr src = (wx_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 wx_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 wx_error_mgr * wx_error_ptr;
 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_ptr myerr = (wx_error_ptr) 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(myerr->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 static inline void wx_cmyk_to_rgb(unsigned char* rgb, const unsigned char* cmyk)
 206 {
 207     register int k = 255 - cmyk[3];
 208     register int k2 = cmyk[3];
 209     register int c;
 210
 211     c = k + k2 * (255 - cmyk[0]) / 255;
 212     rgb[0] = (unsigned char)((c > 255) ? 0 : (255 - c));
 213
 214     c = k + k2 * (255 - cmyk[1]) / 255;
 215     rgb[1] = (unsigned char)((c > 255) ? 0 : (255 - c));
 216
 217     c = k + k2 * (255 - cmyk[2]) / 255;
 218     rgb[2] = (unsigned char)((c > 255) ? 0 : (255 - c));
 219 }
 220
 221 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 222 // C++ object destruction is non-portable) - I don't see any dtors here
 223 #ifdef __VISUALC__
 224     #pragma warning(disable:4611)
 225 #endif /* VC++ */
 226
 227 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 228 {
 229     struct jpeg_decompress_struct cinfo;
 230     struct wx_error_mgr jerr;
 231     unsigned char *ptr;
 232
 233     image->Destroy();
 234     cinfo.err = jpeg_std_error( &jerr.pub );
 235     jerr.pub.error_exit = wx_error_exit;
 236
 237     if (!verbose)
 238         cinfo.err->output_message = wx_ignore_message;
 239
 240     /* Establish the setjmp return context for wx_error_exit to use. */
 241     if (setjmp(jerr.setjmp_buffer)) {
 242       /* If we get here, the JPEG code has signaled an error.
 243        * We need to clean up the JPEG object, close the input file, and return.
 244        */
 245       if (verbose)
 246         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 247       (cinfo.src->term_source)(&cinfo);
 248       jpeg_destroy_decompress(&cinfo);
 249       if (image->Ok()) image->Destroy();
 250       return false;
 251     }
 252
 253     jpeg_create_decompress( &cinfo );
 254     wx_jpeg_io_src( &cinfo, stream );
 255     jpeg_read_header( &cinfo, TRUE );
 256
 257     int bytesPerPixel;
 258     if ((cinfo.out_color_space == JCS_CMYK) || (cinfo.out_color_space == JCS_YCCK))
 259     {
 260         cinfo.out_color_space = JCS_CMYK;
 261         bytesPerPixel = 4;
 262     }
 263     else // all the rest is treated as RGB
 264     {
 265         cinfo.out_color_space = JCS_RGB;
 266         bytesPerPixel = 3;
 267     }
 268
 269     jpeg_start_decompress( &cinfo );
 270
 271     image->Create( cinfo.image_width, cinfo.image_height );
 272     if (!image->Ok()) {
 273         jpeg_finish_decompress( &cinfo );
 274         jpeg_destroy_decompress( &cinfo );
 275         return false;
 276     }
 277     image->SetMask( false );
 278     ptr = image->GetData();
 279
 280     unsigned stride = cinfo.output_width * bytesPerPixel;
 281     JSAMPARRAY tempbuf = (*cinfo.mem->alloc_sarray)
 282                             ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 283
 284     while ( cinfo.output_scanline < cinfo.output_height )
 285     {
 286         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 287         if (cinfo.out_color_space == JCS_RGB)
 288         {
 289             memcpy( ptr, tempbuf[0], stride );
 290             ptr += stride;
 291         }
 292         else // CMYK
 293         {
 294             const unsigned char* inptr = (const unsigned char*) tempbuf[0];
 295             for (size_t i = 0; i < cinfo.output_width; i++)
 296             {
 297                 wx_cmyk_to_rgb(ptr, inptr);
 298                 ptr += 3;
 299                 inptr += 4;
 300             }
 301         }
 302     }
 303
 304     jpeg_finish_decompress( &cinfo );
 305     jpeg_destroy_decompress( &cinfo );
 306     return true;
 307 }
 308
 309 typedef struct {
 310     struct jpeg_destination_mgr pub;
 311
 312     wxOutputStream *stream;
 313     JOCTET * buffer;
 314 } wx_destination_mgr;
 315
 316 typedef wx_destination_mgr * wx_dest_ptr;
 317
 318 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 319
 320 CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
 321 {
 322     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 323
 324     /* Allocate the output buffer --- it will be released when done with image */
 325     dest->buffer = (JOCTET *)
 326         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 327         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 328     dest->pub.next_output_byte = dest->buffer;
 329     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 330 }
 331
 332 CPP_METHODDEF(boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
 333 {
 334     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 335
 336     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 337     dest->pub.next_output_byte = dest->buffer;
 338     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 339     return TRUE;
 340 }
 341
 342 CPP_METHODDEF(void) wx_term_destination (j_compress_ptr cinfo)
 343 {
 344     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 345     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 346     /* Write any data remaining in the buffer */
 347     if (datacount > 0)
 348         dest->stream->Write(dest->buffer, datacount);
 349 }
 350
 351 GLOBAL(void) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 352 {
 353     wx_dest_ptr dest;
 354
 355     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 356         cinfo->dest = (struct jpeg_destination_mgr *)
 357             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 358             sizeof(wx_destination_mgr));
 359     }
 360
 361     dest = (wx_dest_ptr) cinfo->dest;
 362     dest->pub.init_destination = wx_init_destination;
 363     dest->pub.empty_output_buffer = wx_empty_output_buffer;
 364     dest->pub.term_destination = wx_term_destination;
 365     dest->stream = &outfile;
 366 }
 367
 368 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 369 {
 370     struct jpeg_compress_struct cinfo;
 371     struct wx_error_mgr jerr;
 372     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 373     JSAMPLE *image_buffer;
 374     int stride;                /* physical row width in image buffer */
 375
 376     cinfo.err = jpeg_std_error(&jerr.pub);
 377     jerr.pub.error_exit = wx_error_exit;
 378
 379     if (!verbose)
 380         cinfo.err->output_message = wx_ignore_message;
 381
 382     /* Establish the setjmp return context for wx_error_exit to use. */
 383     if (setjmp(jerr.setjmp_buffer))
 384     {
 385         /* If we get here, the JPEG code has signaled an error.
 386          * We need to clean up the JPEG object, close the input file, and return.
 387          */
 388          if (verbose)
 389             wxLogError(_("JPEG: Couldn't save image."));
 390          jpeg_destroy_compress(&cinfo);
 391          return false;
 392     }
 393
 394     jpeg_create_compress(&cinfo);
 395     wx_jpeg_io_dest(&cinfo, stream);
 396
 397     cinfo.image_width = image->GetWidth();
 398     cinfo.image_height = image->GetHeight();
 399     cinfo.input_components = 3;
 400     cinfo.in_color_space = JCS_RGB;
 401     jpeg_set_defaults(&cinfo);
 402
 403     // TODO: 3rd parameter is force_baseline, what value should this be?
 404     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 405     // are limited to 1..255 for JPEG baseline compatibility."
 406     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 407     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 408     // and force_baseline is TRUE.
 409     if (image->HasOption(wxIMAGE_OPTION_QUALITY))
 410         jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
 411
 412     // set the resolution fields in the output file
 413     UINT16 resX,
 414            resY;
 415     if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
 416          image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
 417     {
 418         resX = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
 419         resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
 420     }
 421     else if ( image->HasOption(wxIMAGE_OPTION_RESOLUTION) )
 422     {
 423         resX =
 424         resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
 425     }
 426     else
 427     {
 428         resX =
 429         resY = 0;
 430     }
 431
 432     if ( resX && resY )
 433     {
 434         cinfo.X_density = resX;
 435         cinfo.Y_density = resY;
 436     }
 437
 438     // sets the resolution unit field in the output file
 439     // wxIMAGE_RESOLUTION_INCHES for inches
 440     // wxIMAGE_RESOLUTION_CM for centimeters
 441     if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONUNIT) )
 442     {
 443         cinfo.density_unit = (UINT8)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
 444     }
 445
 446     jpeg_start_compress(&cinfo, TRUE);
 447
 448     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 449     image_buffer = image->GetData();
 450     while (cinfo.next_scanline < cinfo.image_height) {
 451         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 452         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 453     }
 454     jpeg_finish_compress(&cinfo);
 455     jpeg_destroy_compress(&cinfo);
 456
 457     return true;
 458 }
 459
 460 #ifdef __VISUALC__
 461     #pragma warning(default:4611)
 462 #endif /* VC++ */
 463
 464 bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 465 {
 466     unsigned char hdr[2];
 467
 468     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
 469         return false;
 470
 471     return hdr[0] == 0xFF && hdr[1] == 0xD8;
 472 }
 473
 474 #endif   // wxUSE_STREAMS
 475
 476 #endif   // wxUSE_LIBJPEG