elementary textpath: improves text rendering quality of curved text
Summary:
There was wrong logic for calculating # of slices, dt, dist of each segment.
It caused bad rendering quality by putting too much slices on small text.
In addition, textpath didn't care about smoothness of curve's slope changing.
The patch fixes to check differences of previous points and next points for Evas Map.
So, textpath can show more smoothly curved text.
Also, it fixes "autofit" bug when text is much huge than given circle's size.
@tix
Test Plan:
- I'll attach screenshots for comparing rendering quality.
- To see "autofit" bug.
1. Run the following command.
ELM_ACCEL=gl ELM_SCALE=2.0 elementary_test -to "efl.ui.textpath"
2. Toggle "autofit" check box.
3. See the bug case. Textpath can't show all text properly.
Reviewers: raster, cedric, thiepha
Subscribers: #committers, zmike
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D6195
Reviewed-by: Cedric BAIL <cedric@osg.samsung.com>