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compositor: Add doxygen for weston_surface_to_buffer_rect()

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Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Derek Foreman 2015-12-03 16:38:11 -06:00
parent fb1e1268d5
commit 9973967138
1 changed files with 20 additions and 1 deletions
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21
src/compositor.c
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@ -921,6 +921,24 @@ weston_surface_to_buffer_float(struct weston_surface *surface,
*bx, *by, bx, by);
}
/** Transform a rectangle from surface coordinates to buffer coordinates
*
* \param surface The surface to fetch wl_viewport and buffer transformation
* from.
* \param rect The rectangle to transform.
* \return The transformed rectangle.
*
* Viewport and buffer transformations can only do translation, scaling,
* and rotations in 90-degree steps. Therefore the only loss in the
* conversion is coordinate rounding.
*
* However, some coordinate rounding takes place as an intermediate
* step before the buffer scale factor is applied, so the rectangle
* boundary may not be exactly as expected.
*
* This is OK for damage tracking since a little extra coverage is
* not a problem.
*/
WL_EXPORT pixman_box32_t
weston_surface_to_buffer_rect(struct weston_surface *surface,
pixman_box32_t rect)
@ -954,7 +972,8 @@ weston_surface_to_buffer_rect(struct weston_surface *surface,
*
* Viewport and buffer transformations can only do translation, scaling,
* and rotations in 90-degree steps. Therefore the only loss in the
* conversion is coordinate flooring (rounding).
* conversion is from the coordinate rounding that takes place in
* \ref weston_surface_to_buffer_rect.
*/
WL_EXPORT void
weston_surface_to_buffer_region(struct weston_surface *surface,