[cairo] How to copy one cairo_t's context to another?
kalle.vahlman at gmail.com
Mon Aug 13 03:54:41 PDT 2007
2007/8/13, Magicloud Magiclouds <magicloud.magiclouds at gmail.com>:
> I created a cairo_t from: layer =
> rect->width, rect->height)).
First, if you really don't store the surface pointer, you'll leak the
surface that you create.
> And draw something on it. Then I want to
> copy them to the main cairo_t. How to do that?
This works by setting the source of the operations to the surface
which the main cairo context is targeted to. So, something like
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
layer = cairo_create(surface);
...drawing stuff here..
cairo_set_source_surface(main_cairo_context, surface, 0, 0);
cairo_paint(main_cairo_context); /* or draw a path and fill() it or
Remember that you need to destroy the surface after you don't need it anymore.
Also, if the surface you create is short-lived (like for
double-buffering), you could use cairo_push_group() and
Kalle Vahlman, zuh at iki.fi
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