https://bugs.freedesktop.org/show_bug.cgi?id=86211
Bug ID: 86211
Summary: PDF Import: clipping is not implemented
Product: LibreOffice
Version: 4.4.0.0.alpha0+ Master
Hardware: Other
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Drawing
Assignee: [email protected]
Reporter: [email protected]
Created attachment 109354
--> https://bugs.freedesktop.org/attachment.cgi?id=109354&action=edit
Clipping patch v2
PDF format contains a feature, called clipping.
Some parts of an objects can be masked using special clip polygon.
This feature is widely used in gradients, for example.
Gradient is drawn in rectangular area, then clipped by containing polygon.
There is no equivalent of this feature in LO.Draw.
But it can be emulated using polygon intersections.
Here is my patch with such implementation.
But before applying this change, some problems needs to be solved:
1.
Import of radial gradients produces polygons with hundreds of vertices.
Applying additional intersect operations to them produces noticable slowdown.
Maybe using bezier splines in such case will be a good solution.
2.
Intersect operation works bad in some cases, producing inacceptable result.
Bug 84032 is certainly needs to be fixed, but maybe there are some more bugs.
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