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_IMAGE && 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     #include "jpeglib.h"
  33 }
  34 #include "wx/filefn.h"
  35 #include "wx/wfstream.h"
  36 #include "wx/intl.h"
  37 #include "wx/module.h"
  38
  39 // For memcpy
  40 #include <string.h>
  41 // For JPEG library error handling
  42 #include <setjmp.h>
  43
  44 #ifdef __SALFORDC__
  45 #ifdef FAR
  46 #undef FAR
  47 #endif
  48 #endif
  49
  50 #ifdef __WXMSW__
  51 #include <windows.h>
  52 #endif
  53
  54 //-----------------------------------------------------------------------------
  55 // wxJPEGHandler
  56 //-----------------------------------------------------------------------------
  57
  58 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
  59
  60 #if wxUSE_STREAMS
  61
  62 //------------- JPEG Data Source Manager
  63
  64 #define JPEG_IO_BUFFER_SIZE   2048
  65
  66 typedef struct {
  67     struct jpeg_source_mgr pub;   /* public fields */
  68
  69     JOCTET* buffer;               /* start of buffer */
  70     wxInputStream *stream;
  71 } my_source_mgr;
  72
  73 typedef my_source_mgr * my_src_ptr;
  74
  75 METHODDEF(void) my_init_source ( j_decompress_ptr WXUNUSED(cinfo) )
  76 {
  77 }
  78
  79 METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
  80 {
  81     my_src_ptr src = (my_src_ptr) cinfo->src;
  82
  83     src->pub.next_input_byte = src->buffer;
  84     src->pub.bytes_in_buffer = src->stream->Read(src->buffer, JPEG_IO_BUFFER_SIZE).LastRead();
  85
  86     if (src->pub.bytes_in_buffer == 0) // check for end-of-stream
  87     {
  88         // Insert a fake EOI marker
  89         src->buffer[0] = 0xFF;
  90         src->buffer[1] = JPEG_EOI;
  91         src->pub.bytes_in_buffer = 2;
  92     }
  93     return TRUE;
  94 }
  95
  96 METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
  97 {
  98     if (num_bytes > 0)
  99     {
 100         my_src_ptr src = (my_src_ptr) cinfo->src;
 101
 102         while (num_bytes > (long)src->pub.bytes_in_buffer)
 103         {
 104             num_bytes -= (long) src->pub.bytes_in_buffer;
 105             src->pub.fill_input_buffer(cinfo);
 106         }
 107         src->pub.next_input_byte += (size_t) num_bytes;
 108         src->pub.bytes_in_buffer -= (size_t) num_bytes;
 109     }
 110 }
 111
 112 METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
 113 {
 114     my_src_ptr src = (my_src_ptr) cinfo->src;
 115
 116     if (src->pub.bytes_in_buffer > 0)
 117         src->stream->SeekI(-(long)src->pub.bytes_in_buffer, wxFromCurrent);
 118     delete[] src->buffer;
 119 }
 120
 121 void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
 122 {
 123     my_src_ptr src;
 124
 125     if (cinfo->src == NULL) {    /* first time for this JPEG object? */
 126         cinfo->src = (struct jpeg_source_mgr *)
 127             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 128             sizeof(my_source_mgr));
 129         src = (my_src_ptr) cinfo->src;
 130     }
 131     src = (my_src_ptr) cinfo->src;
 132     src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
 133     src->buffer = new JOCTET[JPEG_IO_BUFFER_SIZE];
 134     src->pub.next_input_byte = NULL; /* until buffer loaded */
 135     src->stream = &infile;
 136
 137     src->pub.init_source = my_init_source;
 138     src->pub.fill_input_buffer = my_fill_input_buffer;
 139     src->pub.skip_input_data = my_skip_input_data;
 140     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 141     src->pub.term_source = my_term_source;
 142 }
 143
 144
 145 // JPEG error manager:
 146
 147 struct my_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 my_error_mgr * my_error_ptr;
 154
 155 /*
 156  * Here's the routine that will replace the standard error_exit method:
 157  */
 158
 159 METHODDEF(void)
 160 my_error_exit (j_common_ptr cinfo)
 161 {
 162   /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
 163   my_error_ptr myerr = (my_error_ptr) cinfo->err;
 164
 165   /* Always display the message. */
 166   /* We could postpone this until after returning, if we chose. */
 167   if (cinfo->err->output_message) (*cinfo->err->output_message) (cinfo);
 168
 169   /* Return control to the setjmp point */
 170   longjmp(myerr->setjmp_buffer, 1);
 171 }
 172
 173 // temporarily disable the warning C4611 (interaction between '_setjmp' and
 174 // C++ object destruction is non-portable) - I don't see any dtors here
 175 #ifdef __VISUALC__
 176     #pragma warning(disable:4611)
 177 #endif /* VC++ */
 178
 179 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
 180 {
 181     struct jpeg_decompress_struct cinfo;
 182     struct my_error_mgr jerr;
 183     JSAMPARRAY tempbuf;
 184     unsigned char *ptr;
 185     unsigned stride;
 186
 187     image->Destroy();
 188     cinfo.err = jpeg_std_error( &jerr.pub );
 189     jerr.pub.error_exit = my_error_exit;
 190
 191     if (!verbose) cinfo.err->output_message=NULL;
 192
 193     /* Establish the setjmp return context for my_error_exit to use. */
 194     if (setjmp(jerr.setjmp_buffer)) {
 195       /* If we get here, the JPEG code has signaled an error.
 196        * We need to clean up the JPEG object, close the input file, and return.
 197        */
 198       if (verbose)
 199         wxLogError(_("JPEG: Couldn't load - file is probably corrupted."));
 200       jpeg_destroy_decompress(&cinfo);
 201       if (image->Ok()) image->Destroy();
 202       return FALSE;
 203     }
 204
 205     jpeg_create_decompress( &cinfo );
 206     jpeg_wxio_src( &cinfo, stream );
 207     jpeg_read_header( &cinfo, TRUE );
 208     cinfo.out_color_space = JCS_RGB;
 209     jpeg_start_decompress( &cinfo );
 210
 211     image->Create( cinfo.image_width, cinfo.image_height );
 212     if (!image->Ok()) {
 213         jpeg_finish_decompress( &cinfo );
 214         jpeg_destroy_decompress( &cinfo );
 215         return FALSE;
 216     }
 217     image->SetMask( FALSE );
 218     ptr = image->GetData();
 219     stride = cinfo.output_width * 3;
 220     tempbuf = (*cinfo.mem->alloc_sarray)
 221         ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 222
 223     while ( cinfo.output_scanline < cinfo.output_height ) {
 224         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 225         memcpy( ptr, tempbuf[0], stride );
 226         ptr += stride;
 227     }
 228     jpeg_finish_decompress( &cinfo );
 229     jpeg_destroy_decompress( &cinfo );
 230     return TRUE;
 231 }
 232
 233 typedef struct {
 234     struct jpeg_destination_mgr pub;
 235
 236     wxOutputStream *stream;
 237     JOCTET * buffer;
 238 } my_destination_mgr;
 239
 240 typedef my_destination_mgr * my_dest_ptr;
 241
 242 #define OUTPUT_BUF_SIZE  4096    /* choose an efficiently fwrite'able size */
 243
 244 METHODDEF(void) init_destination (j_compress_ptr cinfo)
 245 {
 246     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 247
 248     /* Allocate the output buffer --- it will be released when done with image */
 249     dest->buffer = (JOCTET *)
 250         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 251         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 252     dest->pub.next_output_byte = dest->buffer;
 253     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 254 }
 255
 256 METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
 257 {
 258     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 259
 260     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 261     dest->pub.next_output_byte = dest->buffer;
 262     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 263     return TRUE;
 264 }
 265
 266 METHODDEF(void) term_destination (j_compress_ptr cinfo)
 267 {
 268     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 269     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 270     /* Write any data remaining in the buffer */
 271     if (datacount > 0)
 272         dest->stream->Write(dest->buffer, datacount);
 273 }
 274
 275 GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 276 {
 277     my_dest_ptr dest;
 278
 279     if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
 280         cinfo->dest = (struct jpeg_destination_mgr *)
 281             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 282             sizeof(my_destination_mgr));
 283     }
 284
 285     dest = (my_dest_ptr) cinfo->dest;
 286     dest->pub.init_destination = init_destination;
 287     dest->pub.empty_output_buffer = empty_output_buffer;
 288     dest->pub.term_destination = term_destination;
 289     dest->stream = &outfile;
 290 }
 291
 292 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
 293 {
 294     struct jpeg_compress_struct cinfo;
 295     struct my_error_mgr jerr;
 296     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 297     JSAMPLE *image_buffer;
 298     int stride;                /* physical row width in image buffer */
 299
 300     cinfo.err = jpeg_std_error(&jerr.pub);
 301     jerr.pub.error_exit = my_error_exit;
 302
 303     if (!verbose) cinfo.err->output_message=NULL;
 304
 305     /* Establish the setjmp return context for my_error_exit to use. */
 306     if (setjmp(jerr.setjmp_buffer))
 307     {
 308         /* If we get here, the JPEG code has signaled an error.
 309          * We need to clean up the JPEG object, close the input file, and return.
 310          */
 311          if (verbose)
 312             wxLogError(_("JPEG: Couldn't save image."));
 313          jpeg_destroy_compress(&cinfo);
 314          return FALSE;
 315     }
 316
 317     jpeg_create_compress(&cinfo);
 318     jpeg_wxio_dest(&cinfo, stream);
 319
 320     cinfo.image_width = image->GetWidth();
 321     cinfo.image_height = image->GetHeight();
 322     cinfo.input_components = 3;
 323     cinfo.in_color_space = JCS_RGB;
 324     jpeg_set_defaults(&cinfo);
 325
 326     // TODO: 3rd parameter is force_baseline, what value should this be?
 327     // Code says: "If force_baseline is TRUE, the computed quantization table entries
 328     // are limited to 1..255 for JPEG baseline compatibility."
 329     // 'Quality' is a number between 0 (terrible) and 100 (very good).
 330     // The default (in jcparam.c, jpeg_set_defaults) is 75,
 331     // and force_baseline is TRUE.
 332     if (image->HasOption(wxT("quality")))
 333         jpeg_set_quality(&cinfo, image->GetOptionInt(wxT("quality")), TRUE);
 334
 335     jpeg_start_compress(&cinfo, TRUE);
 336
 337     stride = cinfo.image_width * 3;    /* JSAMPLEs per row in image_buffer */
 338     image_buffer = image->GetData();
 339     while (cinfo.next_scanline < cinfo.image_height) {
 340         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 341         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 342     }
 343     jpeg_finish_compress(&cinfo);
 344     jpeg_destroy_compress(&cinfo);
 345
 346     return TRUE;
 347 }
 348
 349 #ifdef __VISUALC__
 350     #pragma warning(default:4611)
 351 #endif /* VC++ */
 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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