Meta: Drawing/Writing

[m-weigand]

This is a meta issue regarding improving drawing and writing.

to be filled...

Writing applications

• Saber Notes
• syioek
  • see patch by hrdl: https://gitlab.com/hrdl/pinenote-shared/-/blob/main/patches/sioyek/gl_gles_version.patch?ref_type=heads
  • note from the chat: "<h​rdl> Remember to add touch_mode 1 to sioyek's prefs_user.config, in case you haven't done this"
• RNote

Development

The main issue of drawing applications is that we need the smallest possible damage regions in order to reach acceptable drawing speed. Just refreshing the screen completly does not work with eink screens. Note that gtk4 needs to be investigated in this regard.

• see https://github.com/PNDeb/pn_drawing_tests for some basic GTK3/C drawing example

[hrdl-github]

Note that gtk4 needs to be investigated in this regard.

The GTK4 branch of Xournal++ https://github.com/xournalpp/xournalpp/pull/5615 seems to rely on a single surface for the entire drawing area, which is damaged only in its entirety. RNote on the other hand seems to use a new surface for every "render node", effectively reducing the size of the damage area.