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Fix fl_overlay_rect() for MacOS platform when GUI is scaled.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12911 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy
2018-05-09 15:22:26 +00:00
parent 2b7aac129b
commit a0d7addea8
1 changed files with 6 additions and 18 deletions
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src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
+6 -18
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@@ -173,25 +173,13 @@ void Fl_Quartz_Graphics_Driver::loop(int x, int y, int x1, int y1, int x2, int y
if (quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(gc_, false); if (quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(gc_, false);
} }
// returns y of horizontal line corresponding to pixels of current window
// read by Fl_Cocoa_Screen_Driver::read_win_rectangle( -, y, -, 1)
// when GUI is scaled by s
static float overlay_y(int y, float s, int H) {
int a, b, c;
a = int(H*s) - (y+1)*s; // in Cocoa units from window bottom
c = (s > 1 ? s : 1); // height of pixels read in Cocoa units
b = H*s - (a+c); // top of read image from window top in Cocoa units
return b/s; // top of read image from window top in FLTK units
}
void Fl_Quartz_Graphics_Driver::overlay_rect(int x, int y, int w , int h) { void Fl_Quartz_Graphics_Driver::overlay_rect(int x, int y, int w , int h) {
float s = scale(); float s = scale(); if (s < 2) s = 0;
CGContextSetLineWidth(gc_, 0.01); CGContextSetLineWidth(gc_, 0.05);
int H = Fl_Window::current()->h(); CGContextMoveToPoint(gc_, x, y);
CGContextMoveToPoint(gc_, x, overlay_y(y, s, H)); CGContextAddLineToPoint(gc_, x+w-1 +s/8, y);
CGContextAddLineToPoint(gc_, x+w-1, overlay_y(y, s, H)); CGContextAddLineToPoint(gc_, x+w-1 +s/8, y+h-1 -s/8);
CGContextAddLineToPoint(gc_, x+w-1, overlay_y(y+h-1, s, H)); CGContextAddLineToPoint(gc_, x, y+h-1 -s/8);
CGContextAddLineToPoint(gc_, x, overlay_y(y+h-1, s, H));
CGContextClosePath(gc_); CGContextClosePath(gc_);
CGContextStrokePath(gc_); CGContextStrokePath(gc_);
CGContextSetLineWidth(gc_, quartz_line_width_); CGContextSetLineWidth(gc_, quartz_line_width_);