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surface: introduce wlr_surface_get_buffer_source_box

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This helper allows compositors to retrieve the buffer source box in
buffer-local coordinates.
This commit is contained in:
Simon Ser 2020-06-08 17:35:21 +02:00 committed by Drew DeVault
parent eb22ae97b0
commit c618a76540
2 changed files with 34 additions and 0 deletions
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11
include/wlr/types/wlr_surface.h
View file

@ -262,4 +262,15 @@ void wlr_surface_for_each_surface(struct wlr_surface *surface,
void wlr_surface_get_effective_damage(struct wlr_surface *surface,
pixman_region32_t *damage);
/**
* Get the source rectangle describing the region of the buffer that needs to
* be sampled to render this surface's current state. The box is in
* buffer-local coordinates.
*
* If the viewport's source rectangle is unset, the position is zero and the
* size is the buffer's.
*/
void wlr_surface_get_buffer_source_box(struct wlr_surface *surface,
struct wlr_fbox *box);
#endif

23
types/wlr_surface.c
View file

@ -1226,3 +1226,26 @@ void wlr_surface_get_effective_damage(struct wlr_surface *surface,
surface->previous.width, surface->previous.height);
}
}
void wlr_surface_get_buffer_source_box(struct wlr_surface *surface,
struct wlr_fbox *box) {
box->x = box->y = 0;
box->width = surface->current.buffer_width;
box->height = surface->current.buffer_height;
if (surface->current.viewport.has_src) {
box->x = surface->current.viewport.src.x * surface->current.scale;
box->y = surface->current.viewport.src.y * surface->current.scale;
box->width = surface->current.viewport.src.width * surface->current.scale;
box->height = surface->current.viewport.src.height * surface->current.scale;
if ((surface->current.transform & WL_OUTPUT_TRANSFORM_90) != 0) {
double tmp = box->x;
box->x = box->y;
box->y = tmp;
tmp = box->width;
box->width = box->height;
box->height = tmp;
}
}
}