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
 206 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 207 // C++ object destruction is non-portable) - I don't see any dtors here
 208 #ifdef __VISUALC__
 209     #pragma warning(disable:4611)
 210 #endif /* VC++ */
 211
 212 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 213 {
 214     struct jpeg_decompress_struct cinfo;
 215     struct wx_error_mgr jerr;
 216     JSAMPARRAY tempbuf;
 217     unsigned char *ptr;
 218     unsigned stride;
 219
 220     image->Destroy();
 221     cinfo.err = jpeg_std_error( &jerr.pub );
 222     jerr.pub.error_exit = wx_error_exit;
 223
 224     if (!verbose)
 225         cinfo.err->output_message = wx_ignore_message;
 226
 227     /* Establish the setjmp return context for wx_error_exit to use. */
 228     if (setjmp(jerr.setjmp_buffer)) {
 229       /* If we get here, the JPEG code has signaled an error.
 230        * We need to clean up the JPEG object, close the input file, and return.
 231        */
 232       if (verbose)
 233         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 234       (cinfo.src->term_source)(&cinfo);
 235       jpeg_destroy_decompress(&cinfo);
 236       if (image->Ok()) image->Destroy();
 237       return false;
 238     }
 239
 240     jpeg_create_decompress( &cinfo );
 241     wx_jpeg_io_src( &cinfo, stream );
 242     jpeg_read_header( &cinfo, TRUE );
 243     cinfo.out_color_space = JCS_RGB;
 244     jpeg_start_decompress( &cinfo );
 245
 246     image->Create( cinfo.image_width, cinfo.image_height );
 247     if (!image->Ok()) {
 248         jpeg_finish_decompress( &cinfo );
 249         jpeg_destroy_decompress( &cinfo );
 250         return false;
 251     }
 252     image->SetMask( false );
 253     ptr = image->GetData();
 254     stride = cinfo.output_width * 3;
 255     tempbuf = (*cinfo.mem->alloc_sarray)
 256         ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 257
 258     while ( cinfo.output_scanline < cinfo.output_height ) {
 259         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 260         memcpy( ptr, tempbuf[0], stride );
 261         ptr += stride;
 262     }
 263     jpeg_finish_decompress( &cinfo );
 264     jpeg_destroy_decompress( &cinfo );
 265     return true;
 266 }
 267
 268 typedef struct {
 269     struct jpeg_destination_mgr pub;
 270
 271     wxOutputStream *stream;
 272     JOCTET * buffer;
 273 } wx_destination_mgr;
 274
 275 typedef wx_destination_mgr * wx_dest_ptr;
 276
 277 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 278
 279 CPP_METHODDEF(void) wx_init_destination (j_compress_ptr cinfo)
 280 {
 281     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 282
 283     /* Allocate the output buffer --- it will be released when done with image */
 284     dest->buffer = (JOCTET *)
 285         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 286         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 287     dest->pub.next_output_byte = dest->buffer;
 288     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 289 }
 290
 291 CPP_METHODDEF(boolean) wx_empty_output_buffer (j_compress_ptr cinfo)
 292 {
 293     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 294
 295     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 296     dest->pub.next_output_byte = dest->buffer;
 297     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 298     return TRUE;
 299 }
 300
 301 CPP_METHODDEF(void) wx_term_destination (j_compress_ptr cinfo)
 302 {
 303     wx_dest_ptr dest = (wx_dest_ptr) cinfo->dest;
 304     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 305     /* Write any data remaining in the buffer */
 306     if (datacount > 0)
 307         dest->stream->Write(dest->buffer, datacount);
 308 }
 309
 310 GLOBAL(void) wx_jpeg_io_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 311 {
 312     wx_dest_ptr dest;
 313
 314     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 315         cinfo->dest = (struct jpeg_destination_mgr *)
 316             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 317             sizeof(wx_destination_mgr));
 318     }
 319
 320     dest = (wx_dest_ptr) cinfo->dest;
 321     dest->pub.init_destination = wx_init_destination;
 322     dest->pub.empty_output_buffer = wx_empty_output_buffer;
 323     dest->pub.term_destination = wx_term_destination;
 324     dest->stream = &outfile;
 325 }
 326
 327 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 328 {
 329     struct jpeg_compress_struct cinfo;
 330     struct wx_error_mgr jerr;
 331     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 332     JSAMPLE *image_buffer;
 333     int stride;                /* physical row width in image buffer */
 334
 335     cinfo.err = jpeg_std_error(&jerr.pub);
 336     jerr.pub.error_exit = wx_error_exit;
 337
 338     if (!verbose)
 339         cinfo.err->output_message = wx_ignore_message;
 340
 341     /* Establish the setjmp return context for wx_error_exit to use. */
 342     if (setjmp(jerr.setjmp_buffer))
 343     {
 344         /* If we get here, the JPEG code has signaled an error.
 345          * We need to clean up the JPEG object, close the input file, and return.
 346          */
 347          if (verbose)
 348             wxLogError(_("JPEG: Couldn't save image."));
 349          jpeg_destroy_compress(&cinfo);
 350          return false;
 351     }
 352
 353     jpeg_create_compress(&cinfo);
 354     wx_jpeg_io_dest(&cinfo, stream);
 355
 356     cinfo.image_width = image->GetWidth();
 357     cinfo.image_height = image->GetHeight();
 358     cinfo.input_components = 3;
 359     cinfo.in_color_space = JCS_RGB;
 360     jpeg_set_defaults(&cinfo);
 361
 362     // TODO: 3rd parameter is force_baseline, what value should this be?
 363     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 364     // are limited to 1..255 for JPEG baseline compatibility."
 365     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 366     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 367     // and force_baseline is TRUE.
 368     if (image->HasOption(wxIMAGE_OPTION_QUALITY))
 369         jpeg_set_quality(&cinfo, image->GetOptionInt(wxIMAGE_OPTION_QUALITY), TRUE);
 370
 371     // set the resolution fields in the output file
 372     UINT16 resX,
 373            resY;
 374     if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
 375          image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
 376     {
 377         resX = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
 378         resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
 379     }
 380     else if ( image->HasOption(wxIMAGE_OPTION_RESOLUTION) )
 381     {
 382         resX =
 383         resY = (UINT16)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
 384     }
 385     else
 386     {
 387         resX =
 388         resY = 0;
 389     }
 390
 391     if ( resX && resY )
 392     {
 393         cinfo.X_density = resX;
 394         cinfo.Y_density = resY;
 395     }
 396
 397     // sets the resolution unit field in the output file
 398     // wxIMAGE_RESOLUTION_INCHES for inches
 399     // wxIMAGE_RESOLUTION_CM for centimeters
 400     if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONUNIT) )
 401     {
 402         cinfo.density_unit = (UINT8)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
 403     }
 404
 405     jpeg_start_compress(&cinfo, TRUE);
 406
 407     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 408     image_buffer = image->GetData();
 409     while (cinfo.next_scanline < cinfo.image_height) {
 410         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 411         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 412     }
 413     jpeg_finish_compress(&cinfo);
 414     jpeg_destroy_compress(&cinfo);
 415
 416     return true;
 417 }
 418
 419 #ifdef __VISUALC__
 420     #pragma warning(default:4611)
 421 #endif /* VC++ */
 422
 423 bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 424 {
 425     unsigned char hdr[2];
 426
 427     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
 428         return false;
 429
 430     return hdr[0] == 0xFF && hdr[1] == 0xD8;
 431 }
 432
 433 #endif   // wxUSE_STREAMS
 434
 435 #endif   // wxUSE_LIBJPEG