Merge pull request #137 from ncarrillo/cairo-bitmap-stream

Added support for loading Bitmaps from a Stream for Gtk/Cairo

src/Gtk/Perspex.Cairo/CairoPlatform.cs

@@ -25,7 +25,7 @@ namespace Perspex.Cairo
 
         public IBitmapImpl CreateBitmap(int width, int height)
         {
-            return new BitmapImpl(new ImageSurface(Format.Argb32, width, height));
+            return new BitmapImpl(new Gdk.Pixbuf(Gdk.Colorspace.Rgb, true, 32, width, height));
         }
 
         public IFormattedTextImpl CreateFormattedText(
@@ -57,13 +57,16 @@ namespace Perspex.Cairo
 
         public IBitmapImpl LoadBitmap(string fileName)
         {
-            ImageSurface result = new ImageSurface(fileName);
-            return new BitmapImpl(result);
+            var pixbuf = new Gdk.Pixbuf(fileName);
+
+            return new BitmapImpl(pixbuf);
         }
 
         public IBitmapImpl LoadBitmap(Stream stream)
         {
-            throw new NotImplementedException();
+            var pixbuf = new Gdk.Pixbuf(stream);
+
+            return new BitmapImpl(pixbuf);
         }
 
         private Pango.Context GetPangoContext(IPlatformHandle handle)

src/Gtk/Perspex.Cairo/Media/DrawingContext.cs

@@ -63,7 +63,7 @@ namespace Perspex.Cairo.Media
 
             _context.Save();
             _context.Scale(scaleX, scaleY);
-            _context.SetSourceSurface(impl.Surface, (int)sourceRect.X, (int)sourceRect.Y);
+            Gdk.CairoHelper.SetSourcePixbuf(_context, impl.Surface, (int)sourceRect.X, (int)sourceRect.Y);
             _context.Rectangle(sourceRect.ToCairo());
             _context.Fill();
             _context.Restore();

src/Gtk/Perspex.Cairo/Media/Imaging/BitmapImpl.cs

@@ -10,22 +10,24 @@ namespace Perspex.Cairo.Media.Imaging
 
     public class BitmapImpl : IBitmapImpl
     {
-        public BitmapImpl(Cairo.ImageSurface surface)
+        public BitmapImpl(Gdk.Pixbuf pixbuf)
         {
-            Surface = surface;
+            Surface = pixbuf;
         }
 
         public int PixelWidth => Surface.Width;
 
         public int PixelHeight => Surface.Height;
 
-        public Cairo.ImageSurface Surface
+        public Gdk.Pixbuf Surface
         {
-            get; }
+            get;
+        }
 
         public void Save(string fileName)
         {
-            Surface.WriteToPng(fileName);
+            // TODO: Test
+            Surface.Save(fileName, "png");
         }
     }
 }

src/Gtk/Perspex.Cairo/Media/Imaging/RenderTargetBitmapImpl.cs

@@ -8,23 +8,38 @@ namespace Perspex.Cairo.Media.Imaging
 {
     using Cairo = global::Cairo;
 
-    public class RenderTargetBitmapImpl : BitmapImpl, IRenderTargetBitmapImpl
+    public class RenderTargetBitmapImpl : IRenderTargetBitmapImpl
     {
         public RenderTargetBitmapImpl(
-            Cairo.ImageSurface surface)
-            : base(surface)
+           Cairo.ImageSurface surface)
         {
+            
         }
 
+        public int PixelWidth => Surface.Width;
+
+        public int PixelHeight => Surface.Height;
+
         public void Dispose()
         {
             Surface.Dispose();
         }
 
+
+        public Cairo.ImageSurface Surface
+        {
+            get;
+        }
+
         public void Render(IVisual visual)
         {
             Renderer renderer = new Renderer(Surface);
             renderer.Render(visual, new PlatformHandle(IntPtr.Zero, "RTB"));
         }
+
+        public void Save(string fileName)
+        {
+            Surface.WriteToPng(fileName);
+        }
     }
 }