Bug 90169 – Effective Image size deviates from width and height attributes with sub-pixel layout

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: Layout and Rendering

[Dominik Röttsches (drott)]

Created attachment 149937 [details]
014-wdiff.html failure

When enabling sub-pixel layout, the DRT values for RenderImages are deviating from the specified width and height.
This shows for example in fast/block/basic/014-wdiff.html (diff attached).

I don't see a reason why the image size should be changed from what's specified as height (21) to 22 pixels height and then moved one pixel up (-1).

I'm investigating, but if this is a known issue, Levi & Emil - please let me know.

[Dominik Röttsches (drott)]

Created attachment 150597 [details]
Simplified test case

This test case still results in

layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderImage {IMG} at (0,-1) size 21x22 [bgcolor=#008000]
      RenderText {#text} at (0,0) size 0x0

The image being vertically moved up, and sized larger than specified. This seems wrong to me. It's likely casued by the vertical-align: middle declaration, resulting in a shifted positioning.

[Emil A Eklund]

I believe the fix for 90354 addressed this.

[Dominik Röttsches (drott)]

Unfortunately, bug 90354 doesn't solve this.

[Dominik Röttsches (drott)]

Argh... I was soo close to finding the reason :-) - Good to see it's fixed.

*** This bug has been marked as a duplicate of bug 91464 ***