fixed texture scaling

Vocaluxe/Lib/Draw/CDirect3D.cs

@@ -932,11 +932,41 @@ namespace Vocaluxe.Lib.Draw
                 h = maxSize;
             }
 
-            //Fill the new Bitmap with the texture data
-            BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
-            byte[] data = new byte[4 * w * h];
-            Marshal.Copy(bmpData.Scan0, data, 0, data.Length);
-            bmp.UnlockBits(bmpData);
+            //Older graphics card can only handle textures with sizes being powers of two
+            w = (int)_CheckForNextPowerOf2(w);
+            h = (int)_CheckForNextPowerOf2(h);
+
+            Bitmap bmp2 = null;
+            byte[] data;
+            try
+            {
+                if (w != bmp.Width || h != bmp.Height)
+                {
+                    //Create a new Bitmap with the new sizes
+                    bmp2 = new Bitmap(w, h);
+                    //Scale the texture
+                    Graphics g = Graphics.FromImage(bmp2);
+                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+                    g.SmoothingMode = SmoothingMode.HighQuality;
+                    g.DrawImage(bmp, new Rectangle(0, 0, bmp2.Width, bmp2.Height));
+                    g.Dispose();
+                    bmp = bmp2;
+                }
+
+                //Fill the new Bitmap with the texture data
+                BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
+                data = new byte[4 * w * h];
+                Marshal.Copy(bmpData.Scan0, data, 0, data.Length);
+                bmp.UnlockBits(bmpData);
+            }
+            finally
+            {
+                if (bmp2 != null)
+                    bmp2.Dispose();
+            }
+
+            if (data == null)
+                return new STexture(-1);
 
             return AddTexture(w, h, ref data);
         }