correctly plit bitmap

[elwerene]

No description provided.

[codecov]

Codecov Report

Merging #123 into master will increase coverage by 0.87%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   66.24%   67.12%   +0.87%     
==========================================
  Files          53       53              
  Lines        5134     5122      -12     
==========================================
+ Hits         3401     3438      +37     
+ Misses       1733     1684      -49     

Impacted Files	Coverage Δ
src/drawing/backend.rs	61.17% <0.00%> (+2.35%)	⬆️
src/chart/builder.rs	82.31% <0.00%> (+0.49%)	⬆️
src/chart/context.rs	78.66% <0.00%> (+0.66%)	⬆️
src/coord/datetime.rs	81.22% <0.00%> (+0.74%)	⬆️
src/coord/ranged.rs	43.47% <0.00%> (+1.08%)	⬆️
src/drawing/backend_impl/cairo.rs	89.74% <0.00%> (+1.46%)	⬆️
src/drawing/backend_impl/bitmap.rs	84.84% <0.00%> (+1.78%)	⬆️
src/style/size.rs	78.00% <0.00%> (+2.00%)	⬆️
src/drawing/backend_impl/svg.rs	75.79% <0.00%> (+2.31%)	⬆️
src/style/font/font_desc.rs	50.00% <0.00%> (+2.32%)	⬆️
... and 3 more

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[38]

Oops, nice catch this part isn't tested actually, since svg and bitmap backend implements their own blit function. But this is something we should do. - Thanks so much for the contribution and sorry for the delay.