| Summary: | Recording replay clipping output (1.11.2 & latest git) | ||
|---|---|---|---|
| Product: | cairo | Reporter: | Ross Alexander <ross.alexander> |
| Component: | general | Assignee: | Carl Worth <cworth> |
| Status: | RESOLVED MOVED | QA Contact: | cairo-bugs mailing list <cairo-bugs> |
| Severity: | normal | ||
| Priority: | medium | CC: | ao2, loic.grobol |
| Version: | 1.10.3 | ||
| Hardware: | x86 (IA32) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
Contains source C program and outputs.
test programs in C and python test programs in C and python |
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Having considered this a bit more I decided the problem I wasn't fully understanding the surface / pattern interface. So rather than using a recording surface I used an image surface. I presume an recording surface is designed to emulate an image surface? The results made sense (assuming RGB24 image surfaces are black by default) so there is a good chance my thinking was the bug, not cairo. I'll post a question on the list to double check my thinking. Created attachment 115315 [details]
test programs in C and python
Hi,
I think I experience this too, with the latest git code from 2015-04-24.
I would describe it this way: replaying a recording surface gives different results on different backends, in particular when not replaying at the origin of the target surface.
I am attaching a simplified example, I would expect that the result would look the same (modulo the units) in both the png and the svg, but the result in the svg file is unexpected: from C I get an empty image, from python I get the image but with a zero-sized clipPath which makes it invisible.
Created attachment 115316 [details]
test programs in C and python
Attaching the right archive, sorry.
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Created attachment 44932 [details] Contains source C program and outputs. I create a recording surface that has an initial translate (tx, ty) then draws a rectangle. When I play this back with cairo_set_source_surface(recording, -tx, -ty) & cairo_paint() the box is drawn at the original but it cropped to (width - tx, height - ty). This seems to be the case for PDF, PS & xlib surfaces. I have written a C program to reproduce this (uses gtk+-3.0 for xlib surface but I can write a simple xlib interface if necessary. I have added an xml and svg output for one of the replays but I'm getting very odd output in the svg.