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3 Commits (59e1d3f8516c5a8415e699b43ef5112aa2fc2d76)

Author SHA1 Message Date
Michael Hanselmann 59e1d3f851 waveshare2in13v2: Add test for New() 
Ensure the internal buffer has the correct size and a few other
properties are correct.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>
 4 years ago
Michael Hanselmann ecc1eed386 waveshare213v2: Add support for partial drawing 
When the destination rectangle didn't start at (0,0) or cover the whole
display the Dev.Draw function would continue to update the display in
full. Obviously that didn't result in a good output.

This change updates the drawing logic to only update the affected area
(aligned to whole bytes on the horizontal axis) and limits the amount of
transferred data to the minimum needed to cover the destination
rectangle.

The calculation of the various offsets as well as the function sending
the image data are written to support unittesting.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>
 4 years ago
hansmi 5b35a3fb05
waveshare2in13v2: Deduplicate and simplify logic for sending data (#33) 
Dev.Clear: Avoid writing one beyond the end of the line. Also build the
row data only once before sending it for each line.

Dev.Draw, Dev.DrawPartial: Deduplicate logic for iterating over pixels
and simplify it such that a whole row of bits is built before sending
them in one go.

Tested using a Waveshare e-Paper 2.13in V2 display.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>
 4 years ago