allow color modulation for image widgets

src/guichan/include/guichan/widgets/icon.h

@@ -83,8 +83,12 @@ namespace gcn
 
         virtual bool getDirty() const;
 
+        // only affects the alpha value
+        virtual void setBaseColor(const Color& color);
+
     private:
         Image* mImage;
+        Color mColor;
     };
 }
 

src/guichan/sdl/sdlgraphics.cpp

@@ -150,6 +150,9 @@ namespace gcn
 
         SDL_Surface* srcImage = (SDL_Surface*)image->_getData();
 
+        Color c = getColor();
+        SDL_SetSurfaceColorMod(srcImage, c.r, c.g, c.b);
+        SDL_SetSurfaceAlphaMod(srcImage, c.a);
         SDL_BlitSurface(srcImage, &src, *mTarget, &dst);
     }
 

src/guichan/widgets/icon.cpp

@@ -65,6 +65,7 @@ namespace gcn
     Icon::Icon(Image* image)
     {
         mImage = image;
+        mColor = Color(255, 255, 255, 255);
         setHeight(image->getHeight());
         setWidth(image->getWidth());
         Widget::setDirty(true);
@@ -72,6 +73,7 @@ namespace gcn
 
     void Icon::draw(Graphics* graphics)
     {
+        graphics->setColor(mColor);
         graphics->drawImage(mImage, 0, 0);
     }
 
@@ -103,4 +105,10 @@ namespace gcn
             graphics->drawLine(i,height - i, width - i - 1, height - i);
         }
     }
+
+    void Icon::setBaseColor(const Color& color)
+    {
+        Widget::setDirty(true);
+        mColor = color;
+    }
 }