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Fix X11 clip region outside 16-bit coordinate space.

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This is the first commit of X11 16-bit coordinate space (clipping) fixes.
More to follow...


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12722 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser 2018-03-08 23:09:23 +00:00
parent ad10e4adaf
commit 12f6285147
1 changed files with 7 additions and 2 deletions
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9
src/drivers/Xlib/Fl_Xlib_Graphics_Driver_rect.cxx
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@ -143,11 +143,16 @@ int Fl_Xlib_Graphics_Driver::clip_x (int x) {
// Missing X call: (is this the fastest way to init a 1-rectangle region?)
// Windows equivalent exists, implemented inline in win32.H
// Note: if the entire region is outside the 16-bit X coordinate space an empty
// clipping region is returned which means that *nothing* will be visible.
Fl_Region Fl_Xlib_Graphics_Driver::XRectangleRegion(int x, int y, int w, int h) {
XRectangle R;
clip_to_short(x, y, w, h, line_width_);
Fl_Region r = XCreateRegion(); // create an empty region
if (clip_to_short(x, y, w, h, line_width_)) // outside X coordinate space
return r;
R.x = x; R.y = y; R.width = w; R.height = h;
Fl_Region r = XCreateRegion();
XUnionRectWithRegion(&R, r, r);
return r;
}