diff options
Diffstat (limited to 'drivers/gpu/drm/drm_rect.c')
| -rw-r--r-- | drivers/gpu/drm/drm_rect.c | 140 |
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); |