From 05db7bfc90b3a3806080f34e463c57b9b3d87d31 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 16 Oct 2015 02:18:17 +0300
Subject: [PATCH] Add a signal for window exposure

Windows code is untested.
---
 source/graphics/window.h           | 1 +
 source/graphics/windows/window.cpp | 9 +++++++++
 source/graphics/x11/window.cpp     | 5 ++++-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/source/graphics/window.h b/source/graphics/window.h
index 70b4044..b2c7833 100644
--- a/source/graphics/window.h
+++ b/source/graphics/window.h
@@ -31,6 +31,7 @@ public:
 	sigc::signal<void, const Event &> signal_input_event;
 
 	sigc::signal<void, unsigned, unsigned> signal_resize;
+	sigc::signal<void, unsigned, unsigned, unsigned, unsigned, const Event &> signal_expose;
 	sigc::signal<void> signal_close;
 
 protected:
diff --git a/source/graphics/windows/window.cpp b/source/graphics/windows/window.cpp
index 2d4d75b..68baea7 100644
--- a/source/graphics/windows/window.cpp
+++ b/source/graphics/windows/window.cpp
@@ -183,6 +183,15 @@ bool Window::event(const Event &evnt)
 	case WM_CLOSE:
 		signal_close.emit();
 		break;
+	case WM_PAINT:
+		{
+			RECT update_rect;
+			GetUpdateRect(priv->window, &update_rect, false);
+			unsigned width = update_rect.right-update_rect.left;
+			unsigned height = update_rect.bottom-update_rect.top;
+			signal_expose.emit(update_rect.left, update_rect.top, width, height, evnt);
+		}
+		break;
 	default:
 		return false;
 	}
diff --git a/source/graphics/x11/window.cpp b/source/graphics/x11/window.cpp
index 1747da9..fbaf36c 100644
--- a/source/graphics/x11/window.cpp
+++ b/source/graphics/x11/window.cpp
@@ -29,7 +29,7 @@ void Window::platform_init()
 
 	XSetWindowAttributes attr;
 	attr.override_redirect = options.fullscreen;
-	attr.event_mask = ButtonPressMask|ButtonReleaseMask|PointerMotionMask|KeyPressMask|KeyReleaseMask|StructureNotifyMask|EnterWindowMask;
+	attr.event_mask = ButtonPressMask|ButtonReleaseMask|PointerMotionMask|KeyPressMask|KeyReleaseMask|StructureNotifyMask|EnterWindowMask|ExposureMask;
 
 	priv->window = XCreateWindow(dpy,
 		DefaultRootWindow(dpy),
@@ -198,6 +198,9 @@ bool Window::event(const Event &evnt)
 		if(options.fullscreen)
 			XGrabPointer(display.get_private().display, priv->window, true, None, GrabModeAsync, GrabModeAsync, priv->window, None, CurrentTime);
 		break;
+	case Expose:
+		signal_expose.emit(ev.xexpose.x, ev.xexpose.y, ev.xexpose.width, ev.xexpose.height, evnt);
+		break;
 	default:
 		return false;
 	}
-- 
2.45.2