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Fix fl_overlay_rect() under X11 on HighDPI display.

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The mandelbrot demo program is fixed.
This commit is contained in:
ManoloFLTK 2019-11-01 08:26:22 +01:00
parent 034d49064e
commit 04ec829bfb
1 changed files with 3 additions and 1 deletions
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4
src/Fl_Graphics_Driver.cxx
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@ -204,7 +204,9 @@ unsigned Fl_Graphics_Driver::font_desc_size() {
scale() and in slightly modifying that to help support tiled images. */
void Fl_Graphics_Driver::cache_size(Fl_Image *img, int &width, int &height)
{
if ( int(scale()) == scale() ) {
if ( int(scale()) == scale()
|| width==1 || height==1 // to cover fl_overlay_clear
) {
width = width * scale();
height = height * scale();
} else {