From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 14 Dec 2015 21:08:02 +0000 (+0200)
Subject: Only repaint the control interface when necessary
X-Git-Url: http://git.tdb.fi/?p=geometrycompositor.git;a=commitdiff_plain;h=8702b5773dec7d09e7a0702e78bdb1616dd955f4

Only repaint the control interface when necessary

Rendering after every event can cause key repeat events to pile up in the
event queue and delay processing the selection events.
---

diff --git a/source/control.c b/source/control.c
index 292c108..b268f36 100644
--- a/source/control.c
+++ b/source/control.c
@@ -383,9 +383,11 @@ int interactive(Display *display, GeometryCorrection *corrections, GeometryCorre
 	{
 		XEvent event;
 		KeySym keysym;
+		int repaint;
 
 		XNextEvent(display, &event);
 
+		repaint = 0;
 		switch(event.type)
 		{
 		case KeyPress:
@@ -428,19 +430,26 @@ int interactive(Display *display, GeometryCorrection *corrections, GeometryCorre
 			{
 				update_view(display, &view, &event.xselection);
 				update_pending = 0;
+				repaint = 1;
 			}
 			break;
+		case Expose:
+			repaint = 1;
+			break;
 		default:
 			printf("event %d\n", event.type);
 			break;
 		}
 
-		glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
-		glUseProgram(view.programs[0]);
-		glDrawElements(GL_TRIANGLE_STRIP, view.nelements, GL_UNSIGNED_SHORT, (void *)(12*sizeof(unsigned short)));
-		glUseProgram(view.programs[1]);
-		glDrawElements(GL_LINE_STRIP, 11, GL_UNSIGNED_SHORT, NULL);
-		glXSwapBuffers(display, view.glx_window);
+		if(repaint)
+		{
+			glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+			glUseProgram(view.programs[0]);
+			glDrawElements(GL_TRIANGLE_STRIP, view.nelements, GL_UNSIGNED_SHORT, (void *)(12*sizeof(unsigned short)));
+			glUseProgram(view.programs[1]);
+			glDrawElements(GL_LINE_STRIP, 11, GL_UNSIGNED_SHORT, NULL);
+			glXSwapBuffers(display, view.glx_window);
+		}
 	}
 
 	return 0;