no need to check for wxID_HELP buttons in SetLabel() now that it's overridden in...

[wxWidgets.git] / src / common / imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index 21bcf6ee4d55e5568b77ef520d26dfb39f7e13fd..83446867add08e353f58b615b7d30b13fe501ce2 100644 (file)
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -148,19 +148,19 @@ struct wxPNGInfoStruct
 extern "C"
 {
 
-void PNGLINKAGEMODE wx_PNG_stream_reader( png_structp png_ptr, png_bytep data,
-                                          png_size_t length )
+static void PNGLINKAGEMODE wx_PNG_stream_reader( png_structp png_ptr, png_bytep data,
+                                                 png_size_t length )
 {
     WX_PNG_INFO(png_ptr)->stream.in->Read(data, length);
 }
 
-void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data,
-                                          png_size_t length )
+static void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data,
+                                                 png_size_t length )
 {
     WX_PNG_INFO(png_ptr)->stream.out->Write(data, length);
 }
 
-void
+static void
 PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
 {
     wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL;
@@ -170,7 +170,7 @@ PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
 
 // from pngerror.c
 // so that the libpng doesn't send anything on stderr
-void
+static void
 PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message)
 {
     wx_png_warning(NULL, message);
@@ -302,7 +302,7 @@ bool wxPNGHandler::DoCanRead( wxInputStream& stream )
 {
     unsigned char hdr[4];
 
-    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here
         return false;
 
     return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
@@ -538,7 +538,7 @@ wxPNGHandler::LoadFile(wxImage *image,
         goto error;
 
     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 );
+    png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL );
 
     if (color_type == PNG_COLOR_TYPE_PALETTE)
         png_set_expand( png_ptr );
@@ -558,18 +558,16 @@ wxPNGHandler::LoadFile(wxImage *image,
     if (!image->Ok())
         goto error;
 
-    lines = (unsigned char **)malloc( (size_t)(height * sizeof(unsigned char *)) );
+    // initialize all line pointers to NULL to ensure that they can be safely
+    // free()d if an error occurs before all of them could be allocated
+    lines = (unsigned char **)calloc(height, sizeof(unsigned char *));
     if ( !lines )
         goto error;
 
     for (i = 0; i < height; i++)
     {
         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] );
             goto error;
-        }
     }
 
     png_read_image( png_ptr, lines );
@@ -691,9 +689,6 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
                             ? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH)
                             : 8;
 
-    wxASSERT_MSG( iBitDepth == 8 || iBitDepth == 16,
-                    _T("PNG bit depth must be 8 or 16") );
-
     bool bHasAlpha = image->HasAlpha();
     bool bHasMask = image->HasMask();
     bool bUseAlpha = bHasAlpha || bHasMask;
@@ -710,6 +705,21 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
                                   : PNG_COLOR_TYPE_GRAY;
     }
 
+    if (image->HasOption(wxIMAGE_OPTION_PNG_FILTER))
+        png_set_filter( png_ptr, PNG_FILTER_TYPE_BASE, image->GetOptionInt(wxIMAGE_OPTION_PNG_FILTER) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL))
+        png_set_compression_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL))
+        png_set_compression_mem_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY))
+        png_set_compression_strategy( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY) );
+
+    if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE))
+        png_set_compression_buffer_size( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE) );
+
     png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(),
                   iBitDepth, iPngColorType,
                   PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,