Applied patch [ 1183803 ] PNM: support for ascii grey + raw grey

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34261 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/image/image.bkl

@@ -14,7 +14,7 @@
 
     <wx-data id="data">
         <files>
-            horse.png horse.jpg horse.bmp horse.gif horse.pcx horse.pnm
+            horse.png horse.jpg horse.bmp horse.gif horse.pcx horse.pnm horse_ag.pnm horse_rg.pnm
             horse.tif horse.xpm horse.cur horse.ico horse3.ani
             smile.xbm
         </files>

samples/image/image.cpp

@@ -81,6 +81,9 @@ public:
     wxBitmap  *my_square;
     wxBitmap  *my_anti;
 
+    wxBitmap  *my_horse_asciigrey_pnm;
+    wxBitmap  *my_horse_rawgrey_pnm;
+
     int xH, yH ;
     int m_ani_images ;
 
@@ -410,6 +413,9 @@ MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
     my_square = (wxBitmap*) NULL;
     my_anti = (wxBitmap*) NULL;
 
+    my_horse_asciigrey_pnm = (wxBitmap*) NULL;
+    my_horse_rawgrey_pnm = (wxBitmap*) NULL;
+
     m_ani_images = 0 ;
 
     SetBackgroundColour(* wxWHITE);
@@ -506,6 +512,20 @@ MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
         wxLogError(wxT("Can't load PNM image"));
     else
         my_horse_pnm = new wxBitmap( image );
+
+    image.Destroy();
+
+    if ( !image.LoadFile( dir + _T("horse_ag.pnm"), wxBITMAP_TYPE_PNM ) )
+        wxLogError(wxT("Can't load PNM image"));
+    else
+        my_horse_asciigrey_pnm = new wxBitmap( image );
+
+    image.Destroy();
+
+    if ( !image.LoadFile( dir + _T("horse_rg.pnm"), wxBITMAP_TYPE_PNM ) )
+        wxLogError(wxT("Can't load PNM image"));
+    else
+        my_horse_rawgrey_pnm = new wxBitmap( image );
 #endif
 
 #if wxUSE_LIBTIFF
@@ -622,6 +642,8 @@ MyCanvas::~MyCanvas()
     delete my_smile_xbm;
     delete my_square;
     delete my_anti;
+    delete my_horse_asciigrey_pnm;
+    delete my_horse_rawgrey_pnm;
 }
 
 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
@@ -675,6 +697,14 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
     dc.DrawText( _T("PNM handler"), 30, 1285 );
     if (my_horse_pnm && my_horse_pnm->Ok())
         dc.DrawBitmap( *my_horse_pnm, 30, 1300 );
+    
+    dc.DrawText( _T("PNM handler (ascii grey)"), 280, 1285 );
+    if (my_horse_asciigrey_pnm && my_horse_asciigrey_pnm->Ok())
+        dc.DrawBitmap( *my_horse_asciigrey_pnm, 280, 1300 );
+
+    dc.DrawText( _T("PNM handler (raw grey)"), 530, 1285 );
+    if (my_horse_rawgrey_pnm && my_horse_rawgrey_pnm->Ok())
+        dc.DrawBitmap( *my_horse_rawgrey_pnm, 530, 1300 );
 
     dc.DrawText( _T("TIFF handler"), 30, 1515 );
     if (my_horse_tiff && my_horse_tiff->Ok())

src/common/imagpnm.cpp

@@ -68,13 +68,9 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
 
     switch (c)
     {
-        case wxT('2'):
+        case wxT('2'): // ASCII Grey 
-            if (verbose) wxLogError(_("Loading Grey Ascii PNM image is not yet implemented."));
+        case wxT('3'): // ASCII RGB
-            return false;
+        case wxT('5'): // RAW Grey
-        case wxT('5'):
-            if (verbose) wxLogError(_("Loading Grey Raw PNM image is not yet implemented."));
-            return false;
-        case wxT('3'):
         case wxT('6'): break;
         default:
             if (verbose) wxLogError(_("PNM: File format is not recognized."));
@@ -97,6 +93,23 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
         return false;
     }
 
+
+    if (c=='2') // Ascii GREY 
+    {    
+        wxUint32 value, size=width*height;
+        for (wxUint32 i=0; i<size; ++i)
+        {
+            value=text_stream.Read32();
+            *ptr++=(unsigned char)value; // R
+            *ptr++=(unsigned char)value; // G 
+            *ptr++=(unsigned char)value; // B
+            if ( !buf_stream )
+            {
+                if (verbose) wxLogError(_("PNM: File seems truncated."));
+                return false;
+            }
+        }
+    }
    if (c=='3') // Ascii RBG
       {
         wxUint32 value, size=3*width*height;
@@ -114,6 +127,23 @@ bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose
               }
           }
       }
+   if (c=='5') // Raw GREY
+    {    
+        wxUint32 size=width*height;
+        unsigned char value;
+        for (wxUint32 i=0; i<size; ++i)
+        {
+            buf_stream.Read(&value,1);
+            *ptr++=value; // R
+            *ptr++=value; // G
+            *ptr++=value; // B 
+            if ( !buf_stream )
+            {
+                if (verbose) wxLogError(_("PNM: File seems truncated."));
+                return false;
+            }
+        }
+    }
     if (c=='6') // Raw RGB
       buf_stream.Read( ptr, 3*width*height );