src/common/imagjpeg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  11 #pragma implementation "imagjpeg.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18 #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_LIBJPEG
  24
  25 #include "wx/imagjpeg.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 extern "C"
  31 {
  32 #ifdef __WATCOMC__
  33     #define HAVE_BOOLEAN
  34 #endif
  35     #include "jpeglib.h"
  36 }
  37 #include "wx/filefn.h"
  38 #include "wx/wfstream.h"
  39 #include "wx/intl.h"
  40 #include "wx/module.h"
  41
  42 // For memcpy
  43 #include <string.h>
  44 // For JPEG library error handling
  45 #include <setjmp.h>
  46
  47 #ifdef __SALFORDC__
  48 #ifdef FAR
  49 #undef FAR
  50 #endif
  51 #endif
  52
  53 #ifdef __WXMSW__
  54 #include <windows.h>
  55 #endif
  56
  57 //-----------------------------------------------------------------------------
  58 // wxJPEGHandler
  59 //-----------------------------------------------------------------------------
  60
  61 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
  62
  63 #if wxUSE_STREAMS
  64
  65 //------------- JPEG Data Source Manager
  66
  67 #define JPEG_IO_BUFFER_SIZE   2048
  68
  69 typedef struct {
  70     struct jpeg_source_mgr pub;   /* public fields */
  71
  72     JOCTET* buffer;               /* start of buffer */
  73     wxInputStream *stream;
  74 } my_source_mgr;
  75
  76 typedef my_source_mgr * my_src_ptr;
  77
  78 METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
  79 {
  80 }
  81
  82 METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
  83 {
  84     my_src_ptr src = (my_src_ptr) cinfo->src;
  85
  86     src->pub.next_input_byte = src->buffer;
  87     src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
  88
  89     if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
  90     {
  91         // Insert a fake EOI marker
  92         src->buffer[0] = 0xFF;
  93         src->buffer[1] = JPEG_EOI;
  94         src->pub.bytes_in_buffer = 2;
  95     }
  96     return TRUE;
  97 }
  98
  99 METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
 100 {
 101     if (num_bytes > 0)
 102     {
 103         my_src_ptr src = (my_src_ptr) cinfo->src;
 104
 105         while (num_bytes > (long)src->pub.bytes_in_buffer)
 106         {
 107             num_bytes -= (long) src->pub.bytes_in_buffer;
 108             src->pub.fill_input_buffer(cinfo);
 109         }
 110         src->pub.next_input_byte += (size_t) num_bytes;
 111         src->pub.bytes_in_buffer -= (size_t) num_bytes;
 112     }
 113 }
 114
 115 METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
 116 {
 117     my_src_ptr src = (my_src_ptr) cinfo->src;
 118
 119     if (src->pub.bytes_in_buffer > 0)
 120         src->stream->SeekI(-src->pub.bytes_in_buffer, wxFromCurrent);
 121     delete[] src->buffer;
 122 }
 123
 124 void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
 125 {
 126     my_src_ptr src;
 127
 128     if (cinfo->src == NULL) {    /* first time for this JPEG object? */
 129         cinfo->src = (struct jpeg_source_mgr *)
 130             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 131             sizeof(my_source_mgr));
 132         src = (my_src_ptr) cinfo->src;
 133     }
 134     src = (my_src_ptr) cinfo->src;
 135     src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
 136     src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
 137     src->pub.next_input_byte = NULL; /* until buffer loaded */
 138     src->stream = &infile;
 139
 140     src->pub.init_source = my_init_source;
 141     src->pub.fill_input_buffer = my_fill_input_buffer;
 142     src->pub.skip_input_data = my_skip_input_data;
 143     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 144     src->pub.term_source = my_term_source;
 145 }
 146
 147
 148 // JPEG error manager:
 149
 150 struct my_error_mgr {
 151   struct jpeg_error_mgr pub;    /* "public" fields */
 152
 153   jmp_buf setjmp_buffer;    /* for return to caller */
 154 };
 155
 156 typedef struct my_error_mgr * my_error_ptr;
 157
 158 /*
 159  * Here's the routine that will replace the standard error_exit method:
 160  */
 161
 162 METHODDEF(void)
 163 my_error_exit (j_common_ptr cinfo)
 164 {
 165   /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
 166   my_error_ptr myerr = (my_error_ptr) cinfo->err;
 167
 168   /* Always display the message. */
 169   /* We could postpone this until after returning, if we chose. */
 170   if (cinfo->err->output_message) (*cinfo->err->output_message) (cinfo);
 171
 172   /* Return control to the setjmp point */
 173   longjmp(myerr->setjmp_buffer, 1);
 174 }
 175
 176
 177
 178 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 179 {
 180     struct jpeg_decompress_struct cinfo;
 181     struct my_error_mgr jerr;
 182     JSAMPARRAY tempbuf;
 183     unsigned char *ptr;
 184     unsigned stride;
 185
 186     image->Destroy();
 187     cinfo.err = jpeg_std_error( &jerr.pub );
 188     jerr.pub.error_exit = my_error_exit;
 189
 190     if (!verbose) cinfo.err->output_message=NULL;
 191
 192     /* Establish the setjmp return context for my_error_exit to use. */
 193     if (setjmp(jerr.setjmp_buffer)) {
 194       /* If we get here, the JPEG code has signaled an error.
 195        * We need to clean up the JPEG object, close the input file, and return.
 196        */
 197       if (verbose)
 198         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 199       jpeg_destroy_decompress(&cinfo);
 200       if (image->Ok()) image->Destroy();
 201       return FALSE;
 202     }
 203
 204     jpeg_create_decompress( &cinfo );
 205     jpeg_wxio_src( &cinfo, stream );
 206     jpeg_read_header( &cinfo, TRUE );
 207     cinfo.out_color_space = JCS_RGB;
 208     jpeg_start_decompress( &cinfo );
 209
 210     image->Create( cinfo.image_width, cinfo.image_height );
 211     if (!image->Ok()) {
 212         jpeg_finish_decompress( &cinfo );
 213         jpeg_destroy_decompress( &cinfo );
 214         return FALSE;
 215     }
 216     image->SetMask( FALSE );
 217     ptr = image->GetData();
 218     stride = cinfo.output_width * 3;
 219     tempbuf = (*cinfo.mem->alloc_sarray)
 220         ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 221
 222     while ( cinfo.output_scanline < cinfo.output_height ) {
 223         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 224         memcpy( ptr, tempbuf[0], stride );
 225         ptr += stride;
 226     }
 227     jpeg_finish_decompress( &cinfo );
 228     jpeg_destroy_decompress( &cinfo );
 229     return TRUE;
 230 }
 231
 232
 233
 234
 235
 236 typedef struct {
 237     struct jpeg_destination_mgr pub;
 238
 239     wxOutputStream *stream;
 240     JOCTET * buffer;
 241 } my_destination_mgr;
 242
 243 typedef my_destination_mgr * my_dest_ptr;
 244
 245 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 246
 247 METHODDEF(void) init_destination (j_compress_ptr cinfo)
 248 {
 249     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 250
 251     /* Allocate the output buffer --- it will be released when done with image */
 252     dest->buffer = (JOCTET *)
 253         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 254         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 255     dest->pub.next_output_byte = dest->buffer;
 256     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 257 }
 258
 259 METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
 260 {
 261     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 262
 263     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 264     dest->pub.next_output_byte = dest->buffer;
 265     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 266     return TRUE;
 267 }
 268
 269 METHODDEF(void) term_destination (j_compress_ptr cinfo)
 270 {
 271     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 272     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 273     /* Write any data remaining in the buffer */
 274     if (datacount > 0)
 275         dest->stream->Write(dest->buffer, datacount);
 276 }
 277
 278 GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 279 {
 280     my_dest_ptr dest;
 281
 282     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 283         cinfo->dest = (struct jpeg_destination_mgr *)
 284             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 285             sizeof(my_destination_mgr));
 286     }
 287
 288     dest = (my_dest_ptr) cinfo->dest;
 289     dest->pub.init_destination = init_destination;
 290     dest->pub.empty_output_buffer = empty_output_buffer;
 291     dest->pub.term_destination = term_destination;
 292     dest->stream = &outfile;
 293 }
 294
 295 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 296 {
 297     struct jpeg_compress_struct cinfo;
 298     struct my_error_mgr jerr;
 299     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 300     JSAMPLE *image_buffer;
 301     int stride;                /* physical row width in image buffer */
 302
 303     cinfo.err = jpeg_std_error(&jerr.pub);
 304     jerr.pub.error_exit = my_error_exit;
 305
 306     if (!verbose) cinfo.err->output_message=NULL;
 307
 308     /* Establish the setjmp return context for my_error_exit to use. */
 309     if (setjmp(jerr.setjmp_buffer))
 310     {
 311         /* If we get here, the JPEG code has signaled an error.
 312          * We need to clean up the JPEG object, close the input file, and return.
 313          */
 314          if (verbose)
 315             wxLogError(_("JPEG: Couldn't save image."));
 316          jpeg_destroy_compress(&cinfo);
 317          return FALSE;
 318     }
 319
 320     jpeg_create_compress(&cinfo);
 321     jpeg_wxio_dest(&cinfo, stream);
 322
 323     cinfo.image_width = image->GetWidth();
 324     cinfo.image_height = image->GetHeight();
 325     cinfo.input_components = 3;
 326     cinfo.in_color_space = JCS_RGB;
 327     jpeg_set_defaults(&cinfo);
 328
 329     // TODO: 3rd parameter is force_baseline, what value should this be?
 330     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 331     // are limited to 1..255 for JPEG baseline compatibility."
 332     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 333     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 334     // and force_baseline is TRUE.
 335     if (image->HasOption(wxT("quality")))
 336         jpeg_set_quality(&cinfo, image->GetOptionInt(wxT("quality")), TRUE);
 337
 338     jpeg_start_compress(&cinfo, TRUE);
 339
 340     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 341     image_buffer = image->GetData();
 342     while (cinfo.next_scanline < cinfo.image_height) {
 343         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 344         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 345     }
 346     jpeg_finish_compress(&cinfo);
 347     jpeg_destroy_compress(&cinfo);
 348
 349     return TRUE;
 350 }
 351
 352
 353 bool wxJPEGHandler::DoCanRead( wxInputStream& stream )
 354 {
 355     unsigned char hdr[2];
 356
 357     stream.Read(&hdr, 2);
 358     stream.SeekI(-2, wxFromCurrent);
 359     return (hdr[0] == 0xFF && hdr[1] == 0xD8);
 360 }
 361
 362 #endif   // wxUSE_STREAMS
 363
 364 #endif   // wxUSE_LIBJPEG
 365
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