Trouble with pixmaps
Richard Billington <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
I'm trying to upgrade a GUI constructor backend targeting X-windows. It didn't make use of antialiasing, and I'm trying to rectify that. I've gotten it to render text and graphics using antialiasing, in particular the graphics calls are all done through cairo calls. When the target of my rendering is an x-window window, everything works fine. However, when the target is an x-pixmap, the pixmap is apparently not effected. I say "apparently" because if I try to output the pixmap to a file (using cairo_surface_write_to_png) the pixmap is apparently garbage. If I do the same thing, but make the source a window, I get a png that matches the window output. For both the window and the pixmap, I create a surface using cairo_xlib_surface_create_with_xrender_format, whose documentation for the arguments includes "drawable an X Drawable, (a Pixmap or a Window)". When I first allocate the pixmap, I've tried clearing the pixmap (which I don't seem to need to do for a window), by making the new pixmap the target of a new cairo_t, and calling cairo_set_operator with it and cairo_operator_clear followed by a call to cairo_fill. I've also tried setting the cairo operator to cairo_operator_source instead of the default. None of this seems to have any effect on my being able to detectably render to a pixmap. Suggestions? Many thanks ... -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo