| <html> |
| <!-- |
| This test checks for the regression bug that causes white, horizontal blank bars |
| to occur when scrolling scaled images in Chromium. Since test_shell implements scrolling |
| differently than Chrome, we simulate scrolling by occluding part of the image, and |
| verifying it repaints correctly when the occlusion is removed. The image must straddle |
| the bottom edge of the window with no more than about 20% visible in order to force |
| ImageSkia to do a partial load, as this is a precondition of the regression. |
| --> |
| <script type='text/javascript'> |
| |
| function doScroll() |
| { |
| // Remove occlusion after initial page draw. |
| var occluder = document.getElementById('occluder'); |
| occluder.style.top = 600; |
| |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| } |
| |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| |
| </script> |
| <body onLoad="doScroll();" style="overflow:hidden;"> |
| <p>This test verifies correct repaint of scrolled/re-painted-after-uncovering, scaled images.</p> |
| <p>If successful, the image below extends past the bottom of the window, with no white bar |
| occluding the part of the image adjacent to the bottom of the window.</p> |
| <!-- It is important for the image to be loaded with only a small amount showing, |
| as ImageSkia will only do a partial load in this case, which is required to |
| trigger the regression. --> |
| <img id = "pic" src="resources/image-rescale.jpg" width="160" height="105" |
| style="position: absolute; left: 50px; top:580px" |
| > <!-- Rescaled to 1/2 normal size, required to trigger the regression. --> |
| |
| <!-- The div below occludes part of the image. It is removed shortly after the |
| document has loaded, but if the regression is present the image will not |
| repaint correctly. --> |
| <div id="occluder" style="position:absolute; left:0px; top:590px; width:300px; height:10px; background:white;"></div> |
| </body> |
| </html> |
| |
