src/common/imagjpeg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        imagjpeg.cpp
   3 // Purpose:     wxImage JPEG handler
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation "image.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/image.h"
  22 #include "wx/bitmap.h"
  23 #include "wx/debug.h"
  24 #include "wx/log.h"
  25 #include "wx/app.h"
  26 #if wxUSE_LIBJPEG
  27 extern "C" {
  28 #include <jpeglib.h>
  29 }
  30 #endif
  31 #include "wx/filefn.h"
  32 #include "wx/wfstream.h"
  33 #include "wx/intl.h"
  34 #include "wx/module.h"
  35
  36 // For memcpy
  37 #include <string.h>
  38
  39 #ifdef __SALFORDC__
  40 #ifdef FAR
  41 #undef FAR
  42 #endif
  43 #endif
  44
  45 #ifdef __WXMSW__
  46 #include <windows.h>
  47 #endif
  48
  49 //-----------------------------------------------------------------------------
  50 // wxJPEGHandler
  51 //-----------------------------------------------------------------------------
  52
  53 #if wxUSE_LIBJPEG
  54
  55 #if !USE_SHARED_LIBRARIES
  56 IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
  57 #endif
  58
  59 #if wxUSE_STREAMS
  60
  61
  62 //------------- JPEG Data Source Manager
  63
  64 typedef struct {
  65     struct jpeg_source_mgr pub;   /* public fields */
  66
  67     JOCTET* buffer;               /* start of buffer */
  68 } my_source_mgr;
  69
  70 typedef my_source_mgr * my_src_ptr;
  71
  72 METHODDEF(void) my_init_source ( j_decompress_ptr cinfo )
  73 {
  74 }
  75
  76 METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
  77 {
  78     return TRUE;
  79 }
  80
  81 METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
  82 {
  83     my_src_ptr src = (my_src_ptr) cinfo->src;
  84
  85     src->pub.next_input_byte += (size_t) num_bytes;
  86     src->pub.bytes_in_buffer -= (size_t) num_bytes;
  87 }
  88
  89 METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
  90 {
  91     my_src_ptr src = (my_src_ptr) cinfo->src;
  92
  93     free (src->buffer);
  94 }
  95
  96 void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
  97 {
  98     my_src_ptr src;
  99
 100     if (cinfo->src == NULL) {   /* first time for this JPEG object? */
 101         cinfo->src = (struct jpeg_source_mgr *)
 102             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 103             sizeof(my_source_mgr));
 104         src = (my_src_ptr) cinfo->src;
 105     }
 106     src = (my_src_ptr) cinfo->src;
 107     src->pub.bytes_in_buffer = infile.StreamSize(); /* forces fill_input_buffer on first read */
 108     src->buffer = (JOCTET *) malloc (infile.StreamSize());
 109     src->pub.next_input_byte = src->buffer; /* until buffer loaded */
 110     infile.Read(src->buffer, infile.StreamSize());
 111
 112     src->pub.init_source = my_init_source;
 113     src->pub.fill_input_buffer = my_fill_input_buffer;
 114     src->pub.skip_input_data = my_skip_input_data;
 115     src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
 116     src->pub.term_source = my_term_source;
 117 }
 118
 119
 120
 121 bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream )
 122 {
 123     struct jpeg_decompress_struct cinfo;
 124     struct jpeg_error_mgr jerr;
 125     JSAMPARRAY tempbuf;
 126     unsigned char *ptr;
 127     unsigned stride;
 128
 129     image->Destroy();
 130     cinfo.err = jpeg_std_error( &jerr );
 131     jpeg_create_decompress( &cinfo );
 132     jpeg_wxio_src( &cinfo, stream );
 133     jpeg_read_header( &cinfo, TRUE );
 134     cinfo.out_color_space = JCS_RGB;
 135     jpeg_start_decompress( &cinfo );
 136
 137     image->Create( cinfo.image_width, cinfo.image_height );
 138     if (!image->Ok()) {
 139         jpeg_finish_decompress( &cinfo );
 140         jpeg_destroy_decompress( &cinfo );
 141         return FALSE;
 142     }
 143     image->SetMask( FALSE );
 144     ptr = image->GetData();
 145     stride = cinfo.output_width * 3;
 146     tempbuf = (*cinfo.mem->alloc_sarray)
 147         ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
 148
 149     while ( cinfo.output_scanline < cinfo.output_height ) {
 150         jpeg_read_scanlines( &cinfo, tempbuf, 1 );
 151         memcpy( ptr, tempbuf[0], stride );
 152         ptr += stride;
 153     }
 154     jpeg_finish_decompress( &cinfo );
 155     jpeg_destroy_decompress( &cinfo );
 156     return TRUE;
 157 }
 158
 159
 160
 161
 162
 163 typedef struct {
 164     struct jpeg_destination_mgr pub;
 165
 166     wxOutputStream *stream;
 167     JOCTET * buffer;
 168 } my_destination_mgr;
 169
 170 typedef my_destination_mgr * my_dest_ptr;
 171
 172 #define OUTPUT_BUF_SIZE  4096   /* choose an efficiently fwrite'able size */
 173
 174 METHODDEF(void) init_destination (j_compress_ptr cinfo)
 175 {
 176     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 177
 178     /* Allocate the output buffer --- it will be released when done with image */
 179     dest->buffer = (JOCTET *)
 180         (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 181         OUTPUT_BUF_SIZE * sizeof(JOCTET));
 182     dest->pub.next_output_byte = dest->buffer;
 183     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 184 }
 185
 186 METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
 187 {
 188     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 189
 190     dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
 191     dest->pub.next_output_byte = dest->buffer;
 192     dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
 193     return TRUE;
 194 }
 195
 196 METHODDEF(void) term_destination (j_compress_ptr cinfo)
 197 {
 198     my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
 199     size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
 200     /* Write any data remaining in the buffer */
 201     if (datacount > 0)
 202         dest->stream->Write(dest->buffer, datacount);
 203 }
 204
 205 GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
 206 {
 207     my_dest_ptr dest;
 208
 209     if (cinfo->dest == NULL) {  /* first time for this JPEG object? */
 210         cinfo->dest = (struct jpeg_destination_mgr *)
 211             (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
 212             sizeof(my_destination_mgr));
 213     }
 214
 215     dest = (my_dest_ptr) cinfo->dest;
 216     dest->pub.init_destination = init_destination;
 217     dest->pub.empty_output_buffer = empty_output_buffer;
 218     dest->pub.term_destination = term_destination;
 219     dest->stream = &outfile;
 220 }
 221
 222 bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
 223 {
 224     struct jpeg_compress_struct cinfo;
 225     struct jpeg_error_mgr jerr;
 226     JSAMPROW row_pointer[1];    /* pointer to JSAMPLE row[s] */
 227     JSAMPLE *image_buffer;
 228     int stride;                 /* physical row width in image buffer */
 229
 230     cinfo.err = jpeg_std_error(&jerr);
 231     jpeg_create_compress(&cinfo);
 232     jpeg_wxio_dest(&cinfo, stream);
 233
 234     cinfo.image_width = image->GetWidth();
 235     cinfo.image_height = image->GetHeight();
 236     cinfo.input_components = 3;
 237     cinfo.in_color_space = JCS_RGB;
 238     jpeg_set_defaults(&cinfo);
 239     jpeg_start_compress(&cinfo, TRUE);
 240
 241     stride = cinfo.image_width * 3;     /* JSAMPLEs per row in image_buffer */
 242     image_buffer = image->GetData();
 243     while (cinfo.next_scanline < cinfo.image_height) {
 244         row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
 245         jpeg_write_scanlines( &cinfo, row_pointer, 1 );
 246     }
 247     jpeg_finish_compress(&cinfo);
 248     jpeg_destroy_compress(&cinfo);
 249
 250     return TRUE;
 251 }
 252 #endif // wxUSE_STREAMS
 253
 254 #endif
 255
 256 // wxUSE_LIBJPEG
 257