Compositing layers with cairo_push_group and pop_group_to_source
Render a watermark or shadow into an offscreen Cairo group, then paint it as a single blended layer over your surface.
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cairoCAIRO_STATUS_INVALID_MATRIX: Pattern matrix cache invalidation in cairo_pattern
The Cairo graphics library utilizes an internal cache for transformed coordinates in linear and radial gradients to optimize rendering performance. When a pattern's matrix is modified using cairo_pattern_set_matrix , the library must determine when to invalidate this cache to ensure rendering correctness. In libcairo 1.18.x , there is an unresolved behavior