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