| Summary: | cairo_surface_create_similar_clip can create negative surfaces | ||
|---|---|---|---|
| Product: | poppler | Reporter: | Michaël Cadilhac <michael> |
| Component: | cairo backend | Assignee: | poppler-bugs <poppler-bugs> |
| Status: | RESOLVED DUPLICATE | QA Contact: | |
| Severity: | major | ||
| Priority: | medium | ||
| Version: | unspecified | ||
| Hardware: | x86 (IA32) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | This PDF triggers a cairo error | ||
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Created attachment 87877 [details] This PDF triggers a cairo error The attached PDF is a single page containing an XObject which prints a Knockout transparency group, which itself prints a non-Knockout transparency group. It is not properly drawn using evince because of a cairo error. In greater details: With this PDF, in cairo_surface_create_similar_clip, the surface resulting from: result = cairo_surface_create_similar (target, content, width, height); is defined with a negative height. This in turn leads to the following Cairo error when drawing the group: BAD status: invalid value (typically too big) for the size of the input (surface, pattern, etc.) I'm not sure what the comment: //XXX: negative matrix in the body of the function is refering to, but indeed, there's a sign problem. Adding abs(...) around the two substractions (CairoOutputDev.cc:1425 and next) does the trick --- the PDF is rendered correctly ---, but I'm not sure this is the right fix. (Using git poppler)