// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-/*
- We don't put pragma implement in this file because it is already present in
- src/common/image.cpp
-*/
+#ifdef __GNUG__
+#pragma implementation "imagpng.h"
+#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#include "wx/defs.h"
#endif
-#if wxUSE_LIBPNG
+#if wxUSE_IMAGE && wxUSE_LIBPNG
-#include "wx/image.h"
+#include "wx/imagpng.h"
#include "wx/bitmap.h"
#include "wx/debug.h"
#include "wx/log.h"
// wxPNGHandler
//-----------------------------------------------------------------------------
-#if !USE_SHARED_LIBRARIES
IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)
-#endif
-#if wxUSE_STREAMS
+#if wxUSE_LIBPNG
#if defined(__VISAGECPP__)
-#define LINKAGEMODE _Optlink
+#define PNGLINKAGEMODE _Optlink
+#elif defined(__WATCOMC__)
+#define PNGLINKAGEMODE _cdecl
#else
-#define LINKAGEMODE
+#define PNGLINKAGEMODE
#endif
-static void LINKAGEMODE _PNG_stream_reader( png_structp png_ptr, png_bytep data, png_size_t length )
+static void PNGLINKAGEMODE _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 LINKAGEMODE _PNG_stream_writer( png_structp png_ptr, png_bytep data, png_size_t length )
+static void PNGLINKAGEMODE _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
+PNGLINKAGEMODE 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
+PNGLINKAGEMODE png_silent_warning(png_structp WXUNUSED(png_ptr), png_const_charp WXUNUSED(message))
+{
+}
+
+// temporarily disable the warning C4611 (interaction between '_setjmp' and
+// C++ object destruction is non-portable) - I don't see any dtors here
+#ifdef __VISUALC__
+ #pragma warning(disable:4611)
+#endif /* VC++ */
+
+bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
{
// VZ: as this function uses setjmp() the only fool proof error handling
// method is to use goto (setjmp is not really C++ dtors friendly...)
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;
png_set_expand( png_ptr );
png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
- image->Create( width, height );
+ image->Create( (int)width, (int)height );
if (!image->Ok())
goto error_nolines;
- lines = (unsigned char **)malloc( height * sizeof(unsigned char *) );
+ lines = (unsigned char **)malloc( (size_t)(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)
+ if ((lines[i] = (unsigned char *)malloc( (size_t)(width * (sizeof(unsigned char) * 4)))) == NULL)
{
for ( unsigned int n = 0; n < i; n++ )
free( lines[n] );
{
int transp = 0;
png_read_image( png_ptr, lines );
+ png_read_end( png_ptr, info_ptr );
png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL );
unsigned char *ptr = image->GetData();
if ((color_type == PNG_COLOR_TYPE_GRAY) ||
error_nolines:
lines = NULL; // called from before it was set
error:
- wxLogError(_("Couldn't load a PNG image - probably file is corrupted."));
+ if (verbose)
+ wxLogError(_("Couldn't load a PNG image - file is corrupted or not enough memory."));
if ( image->Ok() )
{
return FALSE;
}
-
-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)
{
data[(x << 2) + 0] = *ptr++;
data[(x << 2) + 1] = *ptr++;
data[(x << 2) + 2] = *ptr++;
- if ((data[(x << 2) + 0] == image->GetMaskRed()) &&
- (data[(x << 2) + 1] == image->GetMaskGreen()) &&
- (data[(x << 2) + 2] == image->GetMaskBlue()))
+ if (( !image->HasMask() ) || \
+ (data[(x << 2) + 0] != image->GetMaskRed()) || \
+ (data[(x << 2) + 1] != image->GetMaskGreen()) || \
+ (data[(x << 2) + 2] != image->GetMaskBlue()))
{
- data[(x << 2) + 3] = 0;
+ data[(x << 2) + 3] = 255;
}
else
{
- data[(x << 2) + 3] = 255;
+ data[(x << 2) + 3] = 0;
}
}
png_bytep row_ptr = data;
return TRUE;
}
-#endif
- // wxUSE_STREAMS
+#ifdef __VISUALC__
+ #pragma warning(default:4611)
+#endif /* VC++ */
-#endif
- // wxUSE_LIBPNG
+bool wxPNGHandler::DoCanRead( 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_STREAMS
+#endif // wxUSE_LIBPNG
projects / wxWidgets.git / blobdiff