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correctly implement canvas expose redraw for both single- and multi-expose contexts

This commit is contained in:
Paul Davis 2024-03-18 10:47:31 -06:00
parent 9efd521ea6
commit 802d9fa487
1 changed files with 13 additions and 5 deletions
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18
libs/canvas/canvas.cc
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@ -1027,14 +1027,14 @@ GtkCanvas::on_expose_event (GdkEventExpose* ev)
draw_context->push_group ();
}
/* draw background color */
draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
Gtkmm2ext::set_source_rgba (draw_context, _bg_color);
draw_context->fill ();
/* render canvas */
if (_single_exposure) {
/* draw background color */
draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
Gtkmm2ext::set_source_rgba (draw_context, _bg_color);
draw_context->fill ();
Canvas::render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), draw_context);
} else {
@ -1042,10 +1042,18 @@ GtkCanvas::on_expose_event (GdkEventExpose* ev)
gint nrects;
gdk_region_get_rectangles (ev->region, &rects, &nrects);
for (gint n = 0; n < nrects; ++n) {
draw_context->set_identity_matrix(); //reset the cairo matrix, just in case someone left it transformed after drawing ( cough )
/* draw background color */
draw_context->rectangle (rects[n].x, rects[n].y, rects[n].x + rects[n].width, rects[n].y + rects[n].height);
Gtkmm2ext::set_source_rgba (draw_context, _bg_color);
draw_context->fill ();
Canvas::render (Rect (rects[n].x, rects[n].y, rects[n].x + rects[n].width, rects[n].y + rects[n].height), draw_context);
}
g_free (rects);
}