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Commit 07074006 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
Browse files

drm: Add drm_rect rotation functions 



Add some helper functions to move drm_rects between different rotated
coordinate spaces. One function does the forward transform and
another does the inverse.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarImre Deak <imre.deak@intel.com>
Acked-by: default avatarDave Airlie <airlied@linux.ie>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent a4969dd7

drivers/gpu/drm/drm_rect.c

+140 −0
Original line number Diff line number Diff line
@@ -293,3 +293,143 @@ void drm_rect_debug_print(const struct drm_rect *r, bool fixed_point) 
		DRM_DEBUG_KMS("%dx%d%+d%+d\n", w, h, r->x1, r->y1);

}

EXPORT_SYMBOL(drm_rect_debug_print);



/**

 * drm_rect_rotate - Rotate the rectangle

 * @r: rectangle to be rotated

 * @width: Width of the coordinate space

 * @height: Height of the coordinate space

 * @rotation: Transformation to be applied

 *

 * Apply @rotation to the coordinates of rectangle @r.

 *

 * @width and @height combined with @rotation define

 * the location of the new origin.

 *

 * @width correcsponds to the horizontal and @height

 * to the vertical axis of the untransformed coordinate

 * space.

 */

void drm_rect_rotate(struct drm_rect *r,

		     int width, int height,

		     unsigned int rotation)

{

	struct drm_rect tmp;



	if (rotation & (BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y))) {

		tmp = *r;



		if (rotation & BIT(DRM_REFLECT_X)) {

			r->x1 = width - tmp.x2;

			r->x2 = width - tmp.x1;

		}



		if (rotation & BIT(DRM_REFLECT_Y)) {

			r->y1 = height - tmp.y2;

			r->y2 = height - tmp.y1;

		}

	}



	switch (rotation & 0xf) {

	case BIT(DRM_ROTATE_0):

		break;

	case BIT(DRM_ROTATE_90):

		tmp = *r;

		r->x1 = tmp.y1;

		r->x2 = tmp.y2;

		r->y1 = width - tmp.x2;

		r->y2 = width - tmp.x1;

		break;

	case BIT(DRM_ROTATE_180):

		tmp = *r;

		r->x1 = width - tmp.x2;

		r->x2 = width - tmp.x1;

		r->y1 = height - tmp.y2;

		r->y2 = height - tmp.y1;

		break;

	case BIT(DRM_ROTATE_270):

		tmp = *r;

		r->x1 = height - tmp.y2;

		r->x2 = height - tmp.y1;

		r->y1 = tmp.x1;

		r->y2 = tmp.x2;

		break;

	default:

		break;

	}

}

EXPORT_SYMBOL(drm_rect_rotate);



/**

 * drm_rect_rotate_inv - Inverse rotate the rectangle

 * @r: rectangle to be rotated

 * @width: Width of the coordinate space

 * @height: Height of the coordinate space

 * @rotation: Transformation whose inverse is to be applied

 *

 * Apply the inverse of @rotation to the coordinates

 * of rectangle @r.

 *

 * @width and @height combined with @rotation define

 * the location of the new origin.

 *

 * @width correcsponds to the horizontal and @height

 * to the vertical axis of the original untransformed

 * coordinate space, so that you never have to flip

 * them when doing a rotatation and its inverse.

 * That is, if you do:

 *

 * drm_rotate(&r, width, height, rotation);

 * drm_rotate_inv(&r, width, height, rotation);

 *

 * you will always get back the original rectangle.

 */

void drm_rect_rotate_inv(struct drm_rect *r,

			 int width, int height,

			 unsigned int rotation)

{

	struct drm_rect tmp;



	switch (rotation & 0xf) {

	case BIT(DRM_ROTATE_0):

		break;

	case BIT(DRM_ROTATE_90):

		tmp = *r;

		r->x1 = width - tmp.y2;

		r->x2 = width - tmp.y1;

		r->y1 = tmp.x1;

		r->y2 = tmp.x2;

		break;

	case BIT(DRM_ROTATE_180):

		tmp = *r;

		r->x1 = width - tmp.x2;

		r->x2 = width - tmp.x1;

		r->y1 = height - tmp.y2;

		r->y2 = height - tmp.y1;

		break;

	case BIT(DRM_ROTATE_270):

		tmp = *r;

		r->x1 = tmp.y1;

		r->x2 = tmp.y2;

		r->y1 = height - tmp.x2;

		r->y2 = height - tmp.x1;

		break;

	default:

		break;

	}



	if (rotation & (BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y))) {

		tmp = *r;



		if (rotation & BIT(DRM_REFLECT_X)) {

			r->x1 = width - tmp.x2;

			r->x2 = width - tmp.x1;

		}



		if (rotation & BIT(DRM_REFLECT_Y)) {

			r->y1 = height - tmp.y2;

			r->y2 = height - tmp.y1;

		}

	}

}

EXPORT_SYMBOL(drm_rect_rotate_inv);

include/drm/drm_rect.h

+6 −0
Original line number Diff line number Diff line
@@ -163,5 +163,11 @@ int drm_rect_calc_vscale_relaxed(struct drm_rect *src, 
				 struct drm_rect *dst,

				 int min_vscale, int max_vscale);

void drm_rect_debug_print(const struct drm_rect *r, bool fixed_point);

void drm_rect_rotate(struct drm_rect *r,

		     int width, int height,

		     unsigned int rotation);

void drm_rect_rotate_inv(struct drm_rect *r,

			 int width, int height,

			 unsigned int rotation);



#endif