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surface: introduce wlr_surface_get_buffer_source_box
This helper allows compositors to retrieve the buffer source box in buffer-local coordinates.
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2 changed files with 34 additions and 0 deletions
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@ -262,4 +262,15 @@ void wlr_surface_for_each_surface(struct wlr_surface *surface,
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void wlr_surface_get_effective_damage(struct wlr_surface *surface,
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pixman_region32_t *damage);
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/**
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* Get the source rectangle describing the region of the buffer that needs to
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* be sampled to render this surface's current state. The box is in
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* buffer-local coordinates.
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*
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* If the viewport's source rectangle is unset, the position is zero and the
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* size is the buffer's.
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*/
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void wlr_surface_get_buffer_source_box(struct wlr_surface *surface,
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struct wlr_fbox *box);
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#endif
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@ -1226,3 +1226,26 @@ void wlr_surface_get_effective_damage(struct wlr_surface *surface,
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surface->previous.width, surface->previous.height);
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}
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}
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void wlr_surface_get_buffer_source_box(struct wlr_surface *surface,
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struct wlr_fbox *box) {
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box->x = box->y = 0;
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box->width = surface->current.buffer_width;
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box->height = surface->current.buffer_height;
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if (surface->current.viewport.has_src) {
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box->x = surface->current.viewport.src.x * surface->current.scale;
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box->y = surface->current.viewport.src.y * surface->current.scale;
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box->width = surface->current.viewport.src.width * surface->current.scale;
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box->height = surface->current.viewport.src.height * surface->current.scale;
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if ((surface->current.transform & WL_OUTPUT_TRANSFORM_90) != 0) {
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double tmp = box->x;
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box->x = box->y;
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box->y = tmp;
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tmp = box->width;
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box->width = box->height;
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box->height = tmp;
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}
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}
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}
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