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Canvas::queue_draw_item_area() now expands the passed-in rect appropriately

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This means that a request to (re)draw the Rect (0.5,0.5,9.5,9.5)
will actually generate an expose event for (0,0,10,10)

Note: the above rects are of the form (x0,y0,x1,y1)
This commit is contained in:
Paul Davis 2018-11-25 19:07:41 -05:00
parent fa2fdc6f19
commit 9c071cd6ef
1 changed files with 35 additions and 1 deletions
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36
libs/canvas/canvas.cc
View file

@ -414,7 +414,41 @@ Canvas::item_moved (Item* item, Rect pre_change_parent_bounding_box)
void
Canvas::queue_draw_item_area (Item* item, Rect area)
{
request_redraw (item->item_to_window (area));
if ((area.width()) > 1.0 && (area.height() > 1.0)) {
/* item has a rectangular bounding box, which may fall
* on non-integer locations. Expand it appropriately.
*/
Rect r = item->item_to_window (area, false);
r.x0 = floor (r.x0);
r.y0 = floor (r.y0);
r.x1 = ceil (r.x1);
r.y1 = ceil (r.y1);
//std::cerr << "redraw box, adjust from " << area << " to " << r << std::endl;
request_redraw (r);
return;
} else if (area.width() > 1.0 && area.height() == 1.0) {
/* horizontal line, which may fall on non-integer
* coordinates.
*/
Rect r = item->item_to_window (area, false);
r.y0 = floor (r.y0);
r.y1 = ceil (r.y1);
//std::cerr << "redraw HLine, adjust from " << area << " to " << r << std::endl;
request_redraw (r);
} else if (area.width() == 1.0 && area.height() > 1.0) {
/* vertical single pixel line, which may fall on non-integer
* coordinates
*/
Rect r = item->item_to_window (area, false);
r.x0 = floor (r.x0);
r.x1 = ceil (r.x1);
//std::cerr << "redraw VLine, adjust from " << area << " to " << r << std::endl;
request_redraw (r);
} else {
/* impossible? one of width or height must be zero ... */
//std::cerr << "redraw IMPOSSIBLE of " << area << std::endl;
request_redraw (item->item_to_window (area, false));
}
}
void