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path: root/drivers/gpu/drm/drm_rect.c
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Diffstat (limited to 'drivers/gpu/drm/drm_rect.c')
-rw-r--r--drivers/gpu/drm/drm_rect.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_rect.c b/drivers/gpu/drm/drm_rect.c
index 7047ca025787..631f5afd451c 100644
--- 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);
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