title: NSImage -drawAtPoint: Draws Too Small
body: <p>I'm using this to combine 2 NSImages : </p>
  
  <pre><code>newImage = [[NSImage alloc] initWithSize:NSMakeSize(size1.width,
                                                      size1.height + size2.height)];
  [newImage lockFocus];
  [firimage drawAtPoint:NSMakePoint(0, 0)
               fromRect:NSMakeRect(0, 0, size1.width, size1.height)
              operation:NSCompositeSourceOver
               fraction:1.0];
  [secimage drawAtPoint:NSMakePoint(0, size1.height)
               fromRect:NSMakeRect(0, 0, size2.width, size2.height)
              operation:NSCompositeSourceOver
               fraction:1.0];
  [newImage unlockFocus];
  </code></pre>
  
  <p>It results in an image with the proper size (2 100x63 images result in a 100x126 image),but the two separate images are drawn way too small, so the resulting image is mostly blank :</p>
  
  <p><img src="https://i.stack.imgur.com/8Pll1.png" alt="Screenshot"></p>
  
  <p>Here are the original images :</p>
  
  <p><img src="https://i.stack.imgur.com/Aa5jT.jpg" alt="Image 1">
  <img src="https://i.stack.imgur.com/HsDRU.jpg" alt="Image 2"></p>