trunk: broken rendering of gradients with "objectBoundingBox" as gradient units (rev >= 12528)

[su_v]

Rendering of the example file 'share/examples/gradient.svg' is broken on load.

Steps to reproduce:
1) launch inkscape (default prefs, default new document)
2) open 'gradient.svg' from '/usr/share/inkscape/examples'

-> most of the objects with radial gradients are barely or not visible, objects with linear gradients are visible, but rendered with a single color.

3) select all (Ctrl+A) and nudge with arrow keys

-> gradient definitions are rewritten, and all gradients appear to be rendered in correct position and size.

Possibly (not verified) a problem with "userSpaceOnUse" vs "objectBoundingBox" (gradientUnits): inkscape writes gradient definitions only in 'userSpaceOnUse', but (used to) support 'objectBoundingBox' units for rendering.
Note: If attribute ‘gradientUnits’ is not specified, then the effect is as if a value of 'objectBoundingBox' were specified.

See also:
<http://www.w3.org/TR/SVG11/pservers.html#LinearGradientElementGradientUnitsAttribute>

Revision which AFAICT triggers this regression:
12528: Remove setItemBounds and _item_bbox because aren't sensible, replace with bbox.
<http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/12528>

Attached: gradient.svg from current trunk (r12583), exported bitmap images from r12526, r12528, r12583 (all on OS X 10.7.5).

[jazzynico (jazzynico)]

Confirmed on Windows XP, Inkscape trunk revision 12583.

[jazzynico (jazzynico)]

Looks very ugly on canvas (but similar to comment #4 when exported to PNG).

[su_v (suv-lp)]

Here's another sample file exposing the same issue (from bug #970355):
<https://bugs.launchpad.net/inkscape/+bug/970355/+attachment/2978206/+files/gradient-transforms-4.svg>

[su_v (suv-lp)]

Setting bug importance, in accordance with
<http://wiki.inkscape.org/wiki/index.php/Bug_management#Bug_importance>
«(…) SVG-compliant documents misinterpreted; (…)»

[su_v (suv-lp)]

Also affects the tutorials shipping with Inkscape (header is not rendered visibly).

[Martin Owens (doctormo)]

rev 12528 was (or should be) complete reverted. I'll look into it tomorrow. Thanks for reporting suv.

[Martin Owens (doctormo)]

A reversion of the svg:patern bbox to _filter_bbox fixes this issue with the example files. See r12646.

[su_v (suv-lp)]

FIx confirmed with r12646, based on the know test cases - thx a lot!