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SubjectRe: [RFC 2/3] drm: Add helper iterator functions to iterate over plane damage.
On Wed, Apr 04, 2018 at 04:49:07PM -0700, Deepak Rawat wrote:
> With damage property in drm_plane_state, this patch adds helper iterator
> to traverse the damage clips. Iterator will return the damage rectangles
> in framebuffer, plane or crtc coordinates as need by driver
> implementation.
>
> Signed-off-by: Deepak Rawat <drawat@vmware.com>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 122 ++++++++++++++++++++++++++++++++++++
> include/drm/drm_atomic_helper.h | 39 ++++++++++++
> 2 files changed, 161 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 55b44e3..355b514 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -3865,3 +3865,125 @@ void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj
> memcpy(state, obj->state, sizeof(*state));
> }
> EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
> +
> +/**
> + * drm_atomic_helper_damage_iter_init - initialize the damage iterator
> + * @iter: The iterator to initialize.
> + * @type: Coordinate type caller is interested in.
> + * @state: plane_state from which to iterate the damage clips.
> + * @hdisplay: Width of crtc on which plane is scanned out.
> + * @vdisplay: Height of crtc on which plane is scanned out.
> + *
> + * Initialize an iterator that is used to translate and clip a set of damage
> + * rectangles in framebuffer coordinates to plane and crtc coordinates. The type
> + * argument specify which type of coordinate to iterate in.
> + *
> + * Returns: 0 on success and negative error code on error. If an error code is
> + * returned then it means the plane state should not update.
> + */
> +int
> +drm_atomic_helper_damage_iter_init(struct drm_atomic_helper_damage_iter *iter,
> + enum drm_atomic_helper_damage_clip_type type,
> + const struct drm_plane_state *state,
> + uint32_t hdisplay, uint32_t vdisplay)
> +{
> + if (!state || !state->crtc || !state->fb)
> + return -EINVAL;
> +
> + memset(iter, 0, sizeof(*iter));
> + iter->clips = (struct drm_rect *)state->damage_clips->data;
> + iter->num_clips = state->num_clips;
> + iter->type = type;
> +
> + /*
> + * Full update in case of scaling or rotation. In future support for
> + * scaling/rotating damage clips can be added
> + */
> + if (state->crtc_w != (state->src_w >> 16) ||
> + state->crtc_h != state->src_h >> 16 || state->rotation != 0) {
> + iter->curr_clip = iter->num_clips;
> + return 0;
> + }
> +
> + iter->fb_src.x1 = 0;
> + iter->fb_src.y1 = 0;
> + iter->fb_src.x2 = state->fb->width;
> + iter->fb_src.y2 = state->fb->height;
> +
> + iter->plane_src.x1 = state->src_x >> 16;
> + iter->plane_src.y1 = state->src_y >> 16;
> + iter->plane_src.x2 = iter->plane_src.x1 + (state->src_w >> 16);
> + iter->plane_src.y2 = iter->plane_src.y1 + (state->src_h >> 16);
> + iter->translate_plane_x = -iter->plane_src.x1;
> + iter->translate_plane_y = -iter->plane_src.y1;
> +
> + /* Clip plane src rect to fb dimensions */
> + drm_rect_intersect(&iter->plane_src, &iter->fb_src);
> +
> + iter->crtc_src.x1 = 0;
> + iter->crtc_src.y1 = 0;
> + iter->crtc_src.x2 = hdisplay;
> + iter->crtc_src.y2 = vdisplay;
> + iter->translate_crtc_x = -(iter->plane_src.x1 - state->crtc_x);
> + iter->translate_crtc_x = -(iter->plane_src.y1 - state->crtc_y);
^
I believe you mean translate_crtc_y here


> +
> + /* Clip crtc src rect to plane dimensions */
> + drm_rect_translate(&iter->crtc_src, -iter->translate_crtc_x,
> + -iter->translate_crtc_x);
Also here ^


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