Seifeddine Dridi created FOP-2535:
-------------------------------------

             Summary: Scaling an image' height relatively to its parent-block' 
height
                 Key: FOP-2535
                 URL: https://issues.apache.org/jira/browse/FOP-2535
             Project: FOP
          Issue Type: Bug
          Components: fo/block
    Affects Versions: trunk
            Reporter: Seifeddine Dridi


I noticed that FOP does not support scaling an image' height using percentage.

In the example below, we set the image' height to be 50% of its parent block 
(the expected height should be 2.5 cm; 5 cm * 0.5 = 2.5 cm). However, FOP sets 
the image' height exactly like its ancestor block (if we ignore alignment 
offset). As a matter of fact, the image' height is always resolved the same 
regardless of the value of attribute "height".

{code}
<fo:block-container position="absolute" height="5cm">
<fo:block>
<fo:external-graphic src="image.jpg" height="50%" 
content-height="scale-to-fit"/>
</fo:block>
</fo:block-container>
{code}

Judging from the latest revision of the source code, it seems that FOP resolves 
the image' height using the parent containing-block-area rather than the 
containing-reference-area. This subtle difference makes it impossible to scale 
an image relatively to its parent block-container.

Any thoughts?

Thanks




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