X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/bdffd806c3441e1d640c445ff785f5f1ea10298d..05159a2750ed2cc5945a85bc5fc6849ad1a30e75:/src/common/imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index 9320f2f371..7e33316411 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -111,8 +111,8 @@ void
 PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message)
 {
     wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr);
-    if ( info->verbose )
-        wxLogError(wxString(message));
+    if (info->verbose)
+        wxLogError( wxString::FromAscii(message) );
 
 #ifdef USE_FAR_KEYWORD
     {
@@ -129,8 +129,8 @@ void
 PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
 {
     wxPNGInfoStruct *info = WX_PNG_INFO(png_ptr);
-    if ( info->verbose )
-        wxLogWarning(wxString(message));
+    if (info->verbose)
+        wxLogWarning( wxString::FromAscii(message) );
 }
 
 } // extern "C"
@@ -188,6 +188,10 @@ bool wxPNGHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
     if (color_type == PNG_COLOR_TYPE_PALETTE)
         png_set_expand( png_ptr );
 
+    // Fix for Bug [ 439207 ] Monochrome PNG images come up black
+    if (bit_depth < 8)
+        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))
@@ -418,9 +422,10 @@ 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');
+    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+        return FALSE;
+
+    return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
 }
 
 #endif  // wxUSE_STREAMS