Use pixman regions to reduce repainting
For now, we just use glScissor and clip to the extent of the damage region,
but we can do even better by clipping the repaint to the region rectangles.
diff --git a/configure.ac b/configure.ac
index b671722..48b9169 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,7 +23,7 @@
PKG_CHECK_MODULES(FFI, [libffi])
PKG_CHECK_MODULES(COMPOSITOR,
- [egl >= 7.10 glesv2 gdk-pixbuf-2.0 libudev >= 136 libdrm >= 2.4.23] xcb-dri2 xcb-xfixes)
+ [egl >= 7.10 glesv2 gdk-pixbuf-2.0 libudev >= 136 libdrm >= 2.4.23] pixman-1 xcb-dri2 xcb-xfixes)
PKG_CHECK_MODULES(GLES2, [egl >= 7.10 glesv2])
PKG_CHECK_MODULES(CLIENT, [egl >= 7.10 gl cairo >= 1.10.0 gdk-pixbuf-2.0 glib-2.0 gobject-2.0 xkbcommon])
PKG_CHECK_MODULES(POPPLER, [poppler-glib gdk-2.0 gio-2.0],