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Devel docs: Mention mid-end background clearing

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Ben Harris
2022-12-06 13:06:36 +00:00
parent 9afdd4cca4
commit 3e072dff91
1 changed files with 3 additions and 1 deletions
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@ -1438,7 +1438,9 @@ The very first time this function is called for a new
area. Since this often involves drawing visual furniture which is area. Since this often involves drawing visual furniture which is
never subsequently altered, it is often simplest to arrange this by never subsequently altered, it is often simplest to arrange this by
having a special \q{first time} flag in the draw state, and having a special \q{first time} flag in the draw state, and
resetting it after the first redraw. resetting it after the first redraw. This function can assume that
the mid-end has filled the drawing area with colour 0 before the first
call.
When this function (or any subfunction) calls the drawing API, it is When this function (or any subfunction) calls the drawing API, it is
expected to pass colour indices which were previously defined by the expected to pass colour indices which were previously defined by the