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viewporter: add doc comment explaining compositor requirements
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@ -11,6 +11,17 @@
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#include <wayland-server-core.h>
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/**
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* Implementation for the viewporter protocol.
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*
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* When enabling viewporter, compositors need to update their rendering logic:
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*
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* - The size of the surface texture may not match the surface size anymore.
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* Compositors must use the surface size only.
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* - Compositors must call wlr_render_subtexture_with_matrix when rendering a
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* surface texture with the source box returned by
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* wlr_surface_get_buffer_source_box.
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*/
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struct wlr_viewporter {
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struct wl_global *global;
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