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: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c
index 7047ca0..631f5af 100644 (file)
--- a/drivers/gpu/drm/drm_rect.c
+++ b/drivers/gpu/drm/drm_rect.c
@@ -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);

diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
index d128629..26bb55e 100644 (file)
--- a/include/drm/drm_rect.h
+++ b/include/drm/drm_rect.h
@@ -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