IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)
#endif
-#if wxUSE_STREAMS
+#if wxUSE_LIBPNG
+
+#if defined(__VISAGECPP__)
+#define LINKAGEMODE _Optlink
+#else
+#define LINKAGEMODE
+#endif
-static void _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length )
+static void LINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length )
{
((wxInputStream*) png_get_io_ptr( png_ptr )) -> Read(data, length);
}
-static void _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length )
+static void LINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length )
{
((wxOutputStream*) png_get_io_ptr( png_ptr )) -> Write(data, length);
}
-bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream )
+// from pngerror.c
+// so that the libpng doesn't send anything on stderr
+void
+LINKAGEMODE png_silent_error(png_structp png_ptr, png_const_charp WXUNUSED(message))
+{
+#ifdef USE_FAR_KEYWORD
+ {
+ jmp_buf jmpbuf;
+ png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
+ longjmp(jmpbuf, 1);
+ }
+#else
+ longjmp(png_ptr->jmpbuf, 1);
+#endif
+}
+
+void
+LINKAGEMODE png_silent_warning(png_structp WXUNUSED(png_ptr), png_const_charp WXUNUSED(message))
+{
+}
+
+bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose)
{
// VZ: as this function uses setjmp() the only fool proof error handling
// method is to use goto (setjmp is not really C++ dtors friendly...)
-
+
unsigned char **lines;
unsigned int i;
png_infop info_ptr = (png_infop) NULL;
-
+
image->Destroy();
-
+
png_structp png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING,
(voidp) NULL,
(png_error_ptr) NULL,
(png_error_ptr) NULL );
if (!png_ptr)
goto error_nolines;
-
+
+ // the file example.c explain how to guess if the stream is a png image
+ if (!verbose) png_set_error_fn(png_ptr, (png_voidp)NULL, png_silent_error, png_silent_warning);
+
info_ptr = png_create_info_struct( png_ptr );
if (!info_ptr)
goto error_nolines;
-
+
if (setjmp(png_ptr->jmpbuf))
goto error_nolines;
-
+
if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
goto error_nolines;
-
+
png_set_read_fn( png_ptr, &stream, _PNG_stream_reader);
-
+
png_uint_32 width,height;
int bit_depth,color_type,interlace_type;
-
+
png_read_info( png_ptr, info_ptr );
png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, (int*) NULL, (int*) NULL );
-
+
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand( png_ptr );
-
+
png_set_strip_16( png_ptr );
png_set_packing( png_ptr );
if (png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand( png_ptr );
png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
-
+
image->Create( width, height );
-
+
if (!image->Ok())
goto error_nolines;
-
+
lines = (unsigned char **)malloc( height * sizeof(unsigned char *) );
if (lines == NULL)
goto error_nolines;
-
+
for (i = 0; i < height; i++)
{
if ((lines[i] = (unsigned char *)malloc(width * (sizeof(unsigned char) * 4))) == NULL)
goto error;
}
}
-
+
// loaded successfully!
{
int transp = 0;
}
}
}
-
+
for ( unsigned int j = 0; j < height; j++ )
free( lines[j] );
free( lines );
-
+
if (transp)
{
image->SetMaskColour( 255, 0, 255 );
image->SetMask( FALSE );
}
}
-
+
return TRUE;
error_nolines:
lines = NULL; // called from before it was set
error:
wxLogError(_("Couldn't load a PNG image - probably file is corrupted."));
-
+
if ( image->Ok() )
{
image->Destroy();
}
-
+
if ( lines )
{
free( lines );
}
-
+
if ( png_ptr )
{
if ( info_ptr )
}
-bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream )
+bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
{
png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
{
return FALSE;
}
-
+
+ if (!verbose) png_set_error_fn(png_ptr, (png_voidp)NULL, png_silent_error, png_silent_warning);
+
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
{
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
return FALSE;
}
-
+
if (setjmp(png_ptr->jmpbuf))
{
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
return FALSE;
}
-
+
png_set_write_fn( png_ptr, &stream, _PNG_stream_writer, NULL);
-
+
png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(), 8,
PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
+
png_color_8 sig_bit;
sig_bit.red = 8;
sig_bit.green = 8;
png_write_info( png_ptr, info_ptr );
png_set_shift( png_ptr, &sig_bit );
png_set_packing( png_ptr );
-
+
unsigned char *data = (unsigned char *)malloc( image->GetWidth()*4 );
if (!data)
{
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
return FALSE;
}
-
+
for (int y = 0; y < image->GetHeight(); y++)
{
unsigned char *ptr = image->GetData() + (y * image->GetWidth() * 3);
png_bytep row_ptr = data;
png_write_rows( png_ptr, &row_ptr, 1 );
}
-
+
free(data);
png_write_end( png_ptr, info_ptr );
png_destroy_write_struct( &png_ptr, (png_infopp)&info_ptr );
return TRUE;
}
-#endif
- // wxUSE_STREAMS
+bool wxPNGHandler::CanRead( wxInputStream& stream )
+{
+ unsigned char hdr[4];
+
+ stream.Read(&hdr, 4);
+ stream.SeekI(-4, wxFromCurrent);
+ return (hdr[0] == 0x89 && hdr[1] == 'P' && hdr[2] == 'N' && hdr[3] == 'G');
+}
-#endif
- // wxUSE_LIBPNG
+#endif // wxUSE_STREAMS
+#endif // wxUSE_LIBPNG
projects / wxWidgets.git / blobdiff