+
+//-----------------------------------------------------------------------------
+// wxJPEGHandler
+//-----------------------------------------------------------------------------
+
+#if wxUSE_LIBJPEG
+
+#if !USE_SHARED_LIBRARIES
+IMPLEMENT_DYNAMIC_CLASS(wxJPEGHandler,wxImageHandler)
+#endif
+
+#if wxUSE_STREAMS
+
+
+//------------- JPEG Data Source Manager
+
+typedef struct {
+ struct jpeg_source_mgr pub; /* public fields */
+
+ JOCTET* buffer; /* start of buffer */
+} my_source_mgr;
+
+typedef my_source_mgr * my_src_ptr;
+
+METHODDEF(void) my_init_source ( j_decompress_ptr cinfo )
+{
+}
+
+METHODDEF(boolean) my_fill_input_buffer ( j_decompress_ptr cinfo )
+{
+ return TRUE;
+}
+
+METHODDEF(void) my_skip_input_data ( j_decompress_ptr cinfo, long num_bytes )
+{
+ my_src_ptr src = (my_src_ptr) cinfo->src;
+
+ src->pub.next_input_byte += (size_t) num_bytes;
+ src->pub.bytes_in_buffer -= (size_t) num_bytes;
+}
+
+METHODDEF(void) my_term_source ( j_decompress_ptr cinfo )
+{
+ my_src_ptr src = (my_src_ptr) cinfo->src;
+
+ free (src->buffer);
+}
+
+void jpeg_wxio_src( j_decompress_ptr cinfo, wxInputStream& infile )
+{
+ my_src_ptr src;
+
+ if (cinfo->src == NULL) { /* first time for this JPEG object? */
+ cinfo->src = (struct jpeg_source_mgr *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+ sizeof(my_source_mgr));
+ src = (my_src_ptr) cinfo->src;
+ }
+ src = (my_src_ptr) cinfo->src;
+ src->pub.bytes_in_buffer = infile.StreamSize(); /* forces fill_input_buffer on first read */
+ src->buffer = (JOCTET *) malloc (infile.StreamSize());
+ src->pub.next_input_byte = src->buffer; /* until buffer loaded */
+ infile.Read(src->buffer, infile.StreamSize());
+
+ src->pub.init_source = my_init_source;
+ src->pub.fill_input_buffer = my_fill_input_buffer;
+ src->pub.skip_input_data = my_skip_input_data;
+ src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
+ src->pub.term_source = my_term_source;
+}
+
+
+
+bool wxJPEGHandler::LoadFile( wxImage *image, wxInputStream& stream )
+{
+ struct jpeg_decompress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ JSAMPARRAY tempbuf;
+ unsigned char *ptr;
+ unsigned stride;
+
+ image->Destroy();
+ cinfo.err = jpeg_std_error( &jerr );
+ jpeg_create_decompress( &cinfo );
+ jpeg_wxio_src( &cinfo, stream );
+ jpeg_read_header( &cinfo, TRUE );
+ cinfo.out_color_space = JCS_RGB;
+ jpeg_start_decompress( &cinfo );
+
+ image->Create( cinfo.image_width, cinfo.image_height );
+ if (!image->Ok()) {
+ jpeg_finish_decompress( &cinfo );
+ jpeg_destroy_decompress( &cinfo );
+ return FALSE;
+ }
+ image->SetMask( FALSE );
+ ptr = image->GetData();
+ stride = cinfo.output_width * 3;
+ tempbuf = (*cinfo.mem->alloc_sarray)
+ ((j_common_ptr) &cinfo, JPOOL_IMAGE, stride, 1 );
+
+ while ( cinfo.output_scanline < cinfo.output_height ) {
+ jpeg_read_scanlines( &cinfo, tempbuf, 1 );
+ memcpy( ptr, tempbuf[0], stride );
+ ptr += stride;
+ }
+ jpeg_finish_decompress( &cinfo );
+ jpeg_destroy_decompress( &cinfo );
+ return TRUE;
+}
+
+
+
+
+
+typedef struct {
+ struct jpeg_destination_mgr pub;
+
+ wxOutputStream *stream;
+ JOCTET * buffer;
+} my_destination_mgr;
+
+typedef my_destination_mgr * my_dest_ptr;
+
+#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
+
+METHODDEF(void) init_destination (j_compress_ptr cinfo)
+{
+ my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+
+ /* Allocate the output buffer --- it will be released when done with image */
+ dest->buffer = (JOCTET *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ OUTPUT_BUF_SIZE * sizeof(JOCTET));
+ dest->pub.next_output_byte = dest->buffer;
+ dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
+}
+
+METHODDEF(boolean) empty_output_buffer (j_compress_ptr cinfo)
+{
+ my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+
+ dest->stream->Write(dest->buffer, OUTPUT_BUF_SIZE);
+ dest->pub.next_output_byte = dest->buffer;
+ dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
+ return TRUE;
+}
+
+METHODDEF(void) term_destination (j_compress_ptr cinfo)
+{
+ my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+ size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
+ /* Write any data remaining in the buffer */
+ if (datacount > 0)
+ dest->stream->Write(dest->buffer, datacount);
+}
+
+GLOBAL(void) jpeg_wxio_dest (j_compress_ptr cinfo, wxOutputStream& outfile)
+{
+ my_dest_ptr dest;
+
+ if (cinfo->dest == NULL) { /* first time for this JPEG object? */
+ cinfo->dest = (struct jpeg_destination_mgr *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+ sizeof(my_destination_mgr));
+ }
+
+ dest = (my_dest_ptr) cinfo->dest;
+ dest->pub.init_destination = init_destination;
+ dest->pub.empty_output_buffer = empty_output_buffer;
+ dest->pub.term_destination = term_destination;
+ dest->stream = &outfile;
+}
+
+
+
+bool wxJPEGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
+{
+ struct jpeg_compress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
+ JSAMPLE *image_buffer;
+ int stride; /* physical row width in image buffer */
+
+ cinfo.err = jpeg_std_error(&jerr);
+ jpeg_create_compress(&cinfo);
+ jpeg_wxio_dest(&cinfo, stream);
+
+ cinfo.image_width = image->GetWidth();
+ cinfo.image_height = image->GetHeight();
+ cinfo.input_components = 3;
+ cinfo.in_color_space = JCS_RGB;
+ jpeg_set_defaults(&cinfo);
+ jpeg_start_compress(&cinfo, TRUE);
+
+ stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
+ image_buffer = image->GetData();
+ while (cinfo.next_scanline < cinfo.image_height) {
+ row_pointer[0] = &image_buffer[cinfo.next_scanline * stride];
+ jpeg_write_scanlines( &cinfo, row_pointer, 1 );
+ }
+ jpeg_finish_compress(&cinfo);
+ jpeg_destroy_compress(&cinfo);
+
+ return TRUE;
+}
+#endif // wxUSE_STREAMS
+
+#endif
+
+ // wxUSE_LIBJPEG
+
+
+
projects / wxWidgets.git / blobdiff