Summary:
evas_object_image_pixels_dirty_set(img B, False) means
1. app want to mark image object's data is not dirty anymore
2. app don't want to be called get_pixels callback.
that does not mean image need to be redraw.
evas_object_image_pixels_dirty_set(img B, True) means
1. image object's data is dirty, so image object need to be redraw.
2. app want to be called get_pixels callback.
but pixels_dirty_set(img B, FALSE) function also set o->changed to true,
it cause problem related with rendering
Below case is the example of problem.
1. Smart object A
2. Child image object B
3. app call pixels_dirty_set(FALSE) inside pixels_get_callback
pixels_get_callback is called inside the image object B's rendering.
enlightenment's e_comp_object_render do upper job.
After adding preload fetch,
evas_object_image_render_post can call evas_object_change.
https://phab.enlightenment.org/D7157
evas_render_updates_internal
0. enlightenment call evas_object_image_pixels_dirty_set(img B, TRUE)
o->changed = 1;
evas_object_change(img B)
1. smart obj A is in render_objects
2. evas_object_image_render_pre B, o->change=0
3. evas_render_mapped (Smart A)
3-1. evas_render_mapped (img B)
: enlightenment call evas_object_image_pixels_dirty_set(img B, False)
: o->changed=1
3-2. evas_object_change_reset(img B)
4. pending_change(img B)
4-1. evas_object_image_render_post(img B)
o->changed=1 (3-1 step) evas_object_change(img B)->evas_object_change(Smart A)
5. render_post_reset
smart A is chaged(4-1 step), so, called evas_object_change_reset(Smart A)
###smart A is reset(5 step), img B is changed(4-1 step). after this case,
img B never get change to be redraw.
Reviewers: Hermet, cedric, zmike, ManMower
Reviewed By: Hermet
Subscribers: zmike, ManMower, #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D7821
e8fe0c9c92