[FOP-2535] Scaling an image' height relatively to its parent-block' height

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.5
• Component/s: fo/block
• Assignee: Unassigned
• Reporter: Seifeddine Dridi
• Created: 19/Oct/15 14:34
• Updated: 19/Oct/15 14:36

Description

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".

<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>

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