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 #endif
  27
  28 // NB: Some compilers define boolean type in Windows headers
  29 //     (e.g. Watcom C++, but not Open Watcom).
  30 //     This causes a conflict with jmorecfg.h header from libjpeg, so we have
  31 //     to make sure libjpeg won't try to define boolean itself. This is done by
  32 //     defining HAVE_BOOLEAN.
  33 #if defined(__WXMSW__) && (defined(__MWERKS__) || defined(__DIGITALMARS__))
  34     #define HAVE_BOOLEAN
  35     #include "wx/msw/wrapwin.h"
  36 #endif
  37
  38 extern "C"
  39 {
  40     #if defined(__WXMSW__)
  41         #define XMD_H
  42     #endif
  43     #include "jpeglib.h"
  44 }
  45
  46 #include "wx/filefn.h"
  47 #include "wx/wfstream.h"
  48 #include "wx/module.h"
  49
  50 // For memcpy
  51 #include <string.h>
  52 // For JPEG library error handling
  53 #include <setjmp.h>
  54
  55 #ifdef __SALFORDC__
  56 #undef FAR
  57 #endif
  58
  59 // ----------------------------------------------------------------------------
  60 // types
  61 // ----------------------------------------------------------------------------
  62
  63 // the standard definition of METHODDEF(type) from jmorecfg.h is "static type"
  64 // which means that we can't declare the method functions as extern "C" - the
  65 // compiler (rightfully) complains about the multiple storage classes in
  66 // declaration
  67 //
  68 // so we only add extern "C" when using our own, modified, jmorecfg.h - and use
  69 // whatever we have in the system headers if this is what we use hoping that it
  70 // should be ok (can't do anything else)
  71 #ifdef JPEG_METHOD_LINKAGE
  72     #define CPP_METHODDEF(type) extern "C" METHODDEF(type)
  73 #else // not using our jmorecfg.h header
  74     #define CPP_METHODDEF(type) METHODDEF(type)
  75 #endif
  76
  77 //-----------------------------------------------------------------------------
  78 // wxJPEGHandler
  79 //-----------------------------------------------------------------------------
  80
  81 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
  82
  83 #if wxUSE_STREAMS
  84
  85 //------------- JPEG Data Source Manager
  86
  87 #define JPEG_IO_BUFFER_SIZE   2048
  88
  89 typedef struct {
  90     struct jpeg_source_mgr pub;   /* public fields */
  91
  92     JOCTET* buffer;               /* start of buffer */
  93     wxInputStream *stream;
  94 } wx_source_mgr;
  95
  96 typedef wx_source_mgr * wx_src_ptr;
  97
  98 CPP_METHODDEF(void) wx_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
  99 {
 100 }
 101
 102 CPP_METHODDEF(boolean) wx_fill_input_buffer ( j_decompress_ptr cinfo )
 103 {
 104     wx_src_ptr src = (wx_src_ptr) cinfo->src;
 105
 106     src->pub.next_input_byte = src->buffer;
 107     src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
 108
 109     if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
 110     {
 111         // Insert a fake EOI marker
 112         src->buffer[0] = 0xFF;
 113         src->buffer[1] = JPEG_EOI;
 114         src->pub.bytes_in_buffer = 2;
 115     }
 116     return TRUE;
 117 }
 118
 119 CPP_METHODDEF(void) wx_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
 120 {
 121     if (num_bytes > 0)
 122     {
 123         wx_src_ptr src = (wx_src_ptr) cinfo->src;
 124
 125         while (num_bytes > (long)src->pub.bytes_in_buffer)
 126         {
 127             num_bytes -= (long) src->pub.bytes_in_buffer;
 128             src->pub.fill_input_buffer(cinfo);
 129         }
 130         src->pub.next_input_byte += (size_t) num_bytes;
 131         src->pub.bytes_in_buffer -= (size_t) num_bytes;
 132     }
 133 }
 134
 135 CPP_METHODDEF(void) wx_term_source ( j_decompress_ptr cinfo )
 136 {
 137     wx_src_ptr src = (wx_src_ptr) cinfo->src;
 138
 139     if (src->pub.bytes_in_buffer > 0)
 140         src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
 141     delete[] src->buffer;
 142 }
 143
 144
 145 // JPEG error manager:
 146
 147 struct wx_error_mgr {
 148   struct jpeg_error_mgr pub;    /* "public" fields */
 149
 150   jmp_buf setjmp_buffer;    /* for return to caller */
 151 };
 152
 153 typedef struct wx_error_mgr * wx_error_ptr;
 154
 155 /*
 156  * Here's the routine that will replace the standard error_exit method:
 157  */
 158
 159 CPP_METHODDEF(void) wx_error_exit (j_common_ptr cinfo)
 160 {
 161   /* cinfo->err really points to a wx_error_mgr struct, so coerce pointer */
 162   wx_error_ptr myerr = (wx_error_ptr) cinfo->err;
 163
 164   /* Always display the message. */
 165   /* We could postpone this until after returning, if we chose. */
 166   (*cinfo->err->output_message) (cinfo);
 167
 168   /* Return control to the setjmp point */
 169   longjmp(myerr->setjmp_buffer, 1);
 170 }
 171
 172 /*
 173  * This will replace the standard output_message method when the user
 174  * wants us to be silent (verbose==false). We must have such method instead of
 175  * simply using NULL for cinfo->err->output_message because it's called
 176  * unconditionally from within libjpeg when there's "garbage input".
 177  */
 178 CPP_METHODDEF(void) wx_ignore_message (j_common_ptr WXUNUSED(cinfo))
 179 {
 180 }
 181
 182 void wx_jpeg_io_src( j_decompress_ptr cinfo, wxInputStream& infile )
 183 {
 184     wx_src_ptr src;
 185
 186     if (cinfo->src == NULL) {    /* first time for this JPEG object? */
 187         cinfo->src = (struct jpeg_source_mgr *)
 188             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 189             sizeof(wx_source_mgr));
 190     }
 191     src = (wx_src_ptr) cinfo->src;
 192     src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
 193     src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
 194     src->pub.next_input_byte = NULL; /* until buffer loaded */
 195     src->stream = &infile;
 196
 197     src->pub.init_source = wx_init_source;
 198     src->pub.fill_input_buffer = wx_fill_input_buffer;
 199     src->pub.skip_input_data = wx_skip_input_data;
 200     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 201     src->pub.term_source = wx_term_source;
 202 }
 203
 204 static inline void wx_cmyk_to_rgb(unsigned char* rgb, const unsigned char* cmyk)
 205 {
 206     register int k = 255 - cmyk[3];
 207     register int k2 = cmyk[3];
 208     register int c;
 209
 210     c = k + k2 * (255 - cmyk[0]) / 255;
 211     rgb[0] = (unsigned char)((c > 255) ? 0 : (255 - c));
 212
 213     c = k + k2 * (255 - cmyk[1]) / 255;
 214     rgb[1] = (unsigned char)((c > 255) ? 0 : (255 - c));
 215
 216     c = k + k2 * (255 - cmyk[2]) / 255;
 217     rgb[2] = (unsigned char)((c > 255) ? 0 : (255 - c));
 218 }
 219
 220 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 221 // C++ object destruction is non-portable) - I don't see any dtors here
 222 #ifdef __VISUALC__
 223     #pragma warning(disable:4611)
 224 #endif /* VC++ */
 225
 226 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 227 {
 228     struct jpeg_decompress_struct cinfo;
 229     struct wx_error_mgr jerr;
 230     unsigned char *ptr;
 231
 232     image->Destroy();
 233     cinfo.err = jpeg_std_error( &jerr.pub );
 234     jerr.pub.error_exit = wx_error_exit;
 235
 236     if (!verbose)
 237         cinfo.err->output_message = wx_ignore_message;
 238
 239     /* Establish the setjmp return context for wx_error_exit to use. */
 240     if (setjmp(jerr.setjmp_buffer)) {
 241       /* If we get here, the JPEG code has signaled an error.
 242        * We need to clean up the JPEG object, close the input file, and return.
 243        */
 244       if (verbose)
 245         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 246       (cinfo.src->term_source)(&cinfo);
 247       jpeg_destroy_decompress(&cinfo);
 248       if (image->Ok()) image->Destroy();
 249       return false;
 250     }
 251
 252     jpeg_create_decompress( &cinfo );
 253     wx_jpeg_io_src( &cinfo, stream );
 254     jpeg_read_header( &cinfo, TRUE );
 255
 256     int bytesPerPixel;
 257     if ((cinfo.out_color_space == JCS_CMYK) || (cinfo.out_color_space == JCS_YCCK))
 258     {
 259         cinfo.out_color_space = JCS_CMYK;
 260         bytesPerPixel = 4;
 261     }
 262     else // all the rest is treated as RGB
 263     {
 264         cinfo.out_color_space = JCS_RGB;
 265         bytesPerPixel = 3;
 266     }
 267
 268     jpeg_start_decompress( &cinfo );
 269
 270     image->Create( cinfo.image_width, cinfo.image_height );
 271     if (!image->Ok()) {
 272         jpeg_finish_decompress( &cinfo );
 273         jpeg_destroy_decompress( &cinfo );
 274         return false;
 275     }
 276     image->SetMask( false );
 277     ptr = image->GetData();
 278
 279     unsigned stride = cinfo.output_width * bytesPerPixel;
 280     JSAMPARRAY tempbuf = (*cinfo.mem->alloc_sarray)
 281                             ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 282
 283     while ( cinfo.output_scanline < cinfo.output_height )
 284     {
 285         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 286         if (cinfo.out_color_space == JCS_RGB)
 287         {
 288             memcpy( ptr, tempbuf[0], stride );
 289             ptr += stride;
 290         }
 291         else // CMYK
 292         {
 293             const unsigned char* inptr = (const unsigned char*) tempbuf[0];
 294             for (size_t i = 0; i < cinfo.output_width; i++)
 295             {
 296                 wx_cmyk_to_rgb(ptr, inptr);
 297                 ptr += 3;
 298                 inptr += 4;
 299             }
 300         }
 301     }
 302
 303     jpeg_finish_decompress( &cinfo );
 304     jpeg_destroy_decompress( &cinfo );
 305     return true;
 306 }
 307
 308 typedef struct {
 309     struct jpeg_destination_mgr pub;
 310
 311     wxOutputStream *stream;
 312     JOCTET * buffer;
 313 } wx_destination_mgr;
 314
 315 typedef wx_destination_mgr * wx_dest_ptr;
 316
 317 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 318
 319 CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
 320 {
 321     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 322
 323     /* Allocate the output buffer --- it will be released when done with image */
 324     dest->buffer = (JOCTET *)
 325         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 326         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 327     dest->pub.next_output_byte = dest->buffer;
 328     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 329 }
 330
 331 CPP_METHODDEF(boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
 332 {
 333     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 334
 335     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 336     dest->pub.next_output_byte = dest->buffer;
 337     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 338     return TRUE;
 339 }
 340
 341 CPP_METHODDEF(void) wx_term_destination (j_compress_ptr cinfo)
 342 {
 343     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 344     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 345     /* Write any data remaining in the buffer */
 346     if (datacount > 0)
 347         dest->stream->Write(dest->buffer, datacount);
 348 }
 349
 350 GLOBAL(void) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 351 {
 352     wx_dest_ptr dest;
 353
 354     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 355         cinfo->dest = (struct jpeg_destination_mgr *)
 356             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 357             sizeof(wx_destination_mgr));
 358     }
 359
 360     dest = (wx_dest_ptr) cinfo->dest;
 361     dest->pub.init_destination = wx_init_destination;
 362     dest->pub.empty_output_buffer = wx_empty_output_buffer;
 363     dest->pub.term_destination = wx_term_destination;
 364     dest->stream = &outfile;
 365 }
 366
 367 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 368 {
 369     struct jpeg_compress_struct cinfo;
 370     struct wx_error_mgr jerr;
 371     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 372     JSAMPLE *image_buffer;
 373     int stride;                /* physical row width in image buffer */
 374
 375     cinfo.err = jpeg_std_error(&jerr.pub);
 376     jerr.pub.error_exit = wx_error_exit;
 377
 378     if (!verbose)
 379         cinfo.err->output_message = wx_ignore_message;
 380
 381     /* Establish the setjmp return context for wx_error_exit to use. */
 382     if (setjmp(jerr.setjmp_buffer))
 383     {
 384         /* If we get here, the JPEG code has signaled an error.
 385          * We need to clean up the JPEG object, close the input file, and return.
 386          */
 387          if (verbose)
 388             wxLogError(_("JPEG: Couldn't save image."));
 389          jpeg_destroy_compress(&cinfo);
 390          return false;
 391     }
 392
 393     jpeg_create_compress(&cinfo);
 394     wx_jpeg_io_dest(&cinfo, stream);
 395
 396     cinfo.image_width = image->GetWidth();
 397     cinfo.image_height = image->GetHeight();
 398     cinfo.input_components = 3;
 399     cinfo.in_color_space = JCS_RGB;
 400     jpeg_set_defaults(&cinfo);
 401
 402     // TODO: 3rd parameter is force_baseline, what value should this be?
 403     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 404     // are limited to 1..255 for JPEG baseline compatibility."
 405     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 406     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 407     // and force_baseline is TRUE.
 408     if (image->HasOption(wxIMAGE_OPTION_QUALITY))
 409         jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
 410
 411     // set the resolution fields in the output file
 412     UINT16 resX,
 413            resY;
 414     if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
 415          image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
 416     {
 417         resX = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
 418         resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
 419     }
 420     else if ( image->HasOption(wxIMAGE_OPTION_RESOLUTION) )
 421     {
 422         resX =
 423         resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
 424     }
 425     else
 426     {
 427         resX =
 428         resY = 0;
 429     }
 430
 431     if ( resX && resY )
 432     {
 433         cinfo.X_density = resX;
 434         cinfo.Y_density = resY;
 435     }
 436
 437     // sets the resolution unit field in the output file
 438     // wxIMAGE_RESOLUTION_INCHES for inches
 439     // wxIMAGE_RESOLUTION_CM for centimeters
 440     if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONUNIT) )
 441     {
 442         cinfo.density_unit = (UINT8)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
 443     }
 444
 445     jpeg_start_compress(&cinfo, TRUE);
 446
 447     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 448     image_buffer = image->GetData();
 449     while (cinfo.next_scanline < cinfo.image_height) {
 450         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 451         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 452     }
 453     jpeg_finish_compress(&cinfo);
 454     jpeg_destroy_compress(&cinfo);
 455
 456     return true;
 457 }
 458
 459 #ifdef __VISUALC__
 460     #pragma warning(default:4611)
 461 #endif /* VC++ */
 462
 463 bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 464 {
 465     unsigned char hdr[2];
 466
 467     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
 468         return false;
 469
 470     return hdr[0] == 0xFF && hdr[1] == 0xD8;
 471 }
 472
 473 #endif   // wxUSE_STREAMS
 474
 475 #endif   // wxUSE_LIBJPEG