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window_layouter: improve window-resize handling

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This patch solves an off-by-one problem in the window-size calculation,
which resulted in sporadic artificial resize requests. In Sculpt, this
glitch caused flickering artifacts in VirtualBox windows caused by
superfluous guest desktop-resize handling.

Furthermore, the patch introduces the dropping of resize requests with
unchanged content.
This commit is contained in:
Norman Feske 2018-11-27 11:25:56 +01:00 committed by Christian Helmuth
parent af5869cd07
commit 4145417f67
2 changed files with 47 additions and 17 deletions
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17
repos/gems/src/app/window_layouter/main.cc
View File

@ -362,26 +362,19 @@ void Window_layouter::Main::_gen_resize_request()
{
bool resize_needed = false;
_window_list.for_each_window([&] (Window const &window) {
if (window.client_size() != window.requested_size())
if (window.resize_request_needed())
resize_needed = true; });
if (!resize_needed)
return;
_resize_request_reporter.generate([&] (Xml_generator &xml) {
_window_list.for_each_window([&] (Window const &window) {
window.gen_resize_request(xml); }); });
Area const requested_size = window.requested_size();
if (requested_size != window.client_size()) {
xml.node("window", [&] () {
xml.attribute("id", window.id().value);
xml.attribute("width", requested_size.w());
xml.attribute("height", requested_size.h());
});
}
});
});
/* prevent superfluous resize requests for the same size */
_window_list.for_each_window([&] (Window &window) {
window.resize_request_updated(); });
}

47
repos/gems/src/app/window_layouter/window.h
View File

@ -96,6 +96,14 @@ class Window_layouter::Window : public List_model<Window>::Element
*/
Area _requested_size;
/**
* Most recent resize request propagated to the window manager
*
* Initially, no resize request must be generated because the
* '_requested_size' corresponds to the window size.
*/
Area _reported_resize_request = _requested_size;
/**
* Window may be partially transparent
*/
@ -236,10 +244,10 @@ class Window_layouter::Window : public List_model<Window>::Element
return _drag_geometry;
/* resize window */
if (_drag_left_border) x1 = x2 - _client_size.w();
if (_drag_right_border) x2 = x1 + _client_size.w();
if (_drag_top_border) y1 = y2 - _client_size.h();
if (_drag_bottom_border) y2 = y1 + _client_size.h();
if (_drag_left_border) x1 = x2 - _client_size.w() + 1;
if (_drag_right_border) x2 = x1 + _client_size.w() - 1;
if (_drag_top_border) y1 = y2 - _client_size.h() + 1;
if (_drag_bottom_border) y2 = y1 + _client_size.h() - 1;
return Rect(Point(x1, y1), Point(x2, y2));
}
@ -304,7 +312,35 @@ class Window_layouter::Window : public List_model<Window>::Element
xml.attribute("maximized", true);
}
Area requested_size() const { return _requested_size; }
/**
* Return true if a request request to the window manager is due
*/
bool resize_request_needed() const
{
/* a resize request for the current size is already in flight */
if (_requested_size == _reported_resize_request)
return false;
return (_requested_size != _client_size);
}
/**
* Mark the currently requested size as processed so that no further
* resize requests for the same size are generated
*/
void resize_request_updated() { _reported_resize_request = _requested_size; }
void gen_resize_request(Xml_generator &xml) const
{
if (_requested_size == _client_size)
return;
xml.node("window", [&] () {
xml.attribute("id", _id.value);
xml.attribute("width", _requested_size.w());
xml.attribute("height", _requested_size.h());
});
}
void generate(Xml_generator &xml) const
{
@ -372,6 +408,7 @@ class Window_layouter::Window : public List_model<Window>::Element
_drag_top_border = false;
_drag_bottom_border = false;
_requested_size = effective_inner_geometry().area();
}
void to_front_cnt(unsigned to_front_cnt) { _to_front_cnt = to_front_cnt; }