Add support for RANDR extension.

Track screen and CRTC geometry changes, and use sensible window and menu
placement policies when multiple CRTCs are present.

1 files changed, 30 insertions, 2 deletions

diff --git a/gwm.h b/gwm.h
index 10ade58..8d5525c 100644
--- a/gwm.h
+++ b/gwm.h
@@ -49,7 +49,9 @@ extern MALLOC void *xcalloc( size_t number, size_t size );
 
 enum _extended_event_type {
     SYNTHETIC_EVENT = XCB_MAPPING_NOTIFY + 1,
-    SHAPE_NOTIFY
+    RANDR_CRTC_CHANGE_NOTIFY,
+    SHAPE_NOTIFY,
+    NUM_EXTENDED_EVENTS
 };
 
 extern xcb_connection_t *c;
@@ -124,6 +126,9 @@ enum gwm_extension {
 #if USE_DAMAGE
     EXT_DAMAGE,
 #endif
+#if USE_RANDR
+    EXT_RANDR,
+#endif
 #if USE_RENDER
     EXT_RENDER,
 #endif
@@ -136,7 +141,8 @@ enum gwm_extension {
     NUM_EXTENSIONS
 };
 
-#if USE_COMPOSITE || USE_DAMAGE || USE_RENDER || USE_SHAPE || USE_FIXES
+#if USE_COMPOSITE || USE_DAMAGE || USE_RANDR || USE_RENDER || USE_SHAPE || \
+    USE_XFIXES
 #define EXTENSIONS_SIZE NUM_EXTENSIONS
 #else
 #define EXTENSIONS_SIZE 1 /* avoid zero length arrays */
@@ -166,12 +172,23 @@ enum decoration_col {
 extern int num_screens;
 extern xcb_screen_t **screens;
 
+#if USE_RANDR
+struct gwm_crtc {
+    uint32_t crtc;
+    int x, y, width, height;
+};
+#endif
+
 struct gwm_screen {
     xcb_visualtype_t *root_visual;
     xcb_atom_t wm_atom; /* the atom WM_Sn, where n is the screen number */
     xcb_colormap_t cmap; /* the most recently installed colormap */
     xcb_timestamp_t cmap_time; /* the time at which it was installed */
     uint32_t pixels[ NUM_COLS ]; /* pixel values in the default cmap */
+#if USE_RANDR
+    struct gwm_crtc **crtcs;
+    int num_crtcs;
+#endif
 };
 
 extern struct gwm_screen *gwm_screens;
@@ -360,6 +377,14 @@ extern CONST int initial_press( xcb_button_press_event_t *ev );
    terminate a passive grab). */
 extern CONST int final_release( xcb_button_release_event_t *ev );
 
+/* Return TRUE iff a point is "live" (within at least one CRTC). */
+extern int point_live( int screen, int x, int y );
+
+/* Move an area the shortest Manhattan distance so that at an area of at
+   least min_x x min_y pixels fall within at least one CRTC, if possible. */
+extern void make_area_live( int screen, int *x, int *y, int width, int height,
+			    int min_x, int min_y );
+
 extern CONST xcb_timestamp_t event_time( xcb_generic_event_t *ev );
 
 /* The window whose event handler(s) should be invoked for pointer events.
@@ -372,6 +397,9 @@ extern xcb_window_t pointer_demux;
 extern void install_window_colormap( int screen, struct gwm_window *window,
 				     xcb_timestamp_t t );
 
+extern void update_crtc( int screen, int crtc, int width, int height,
+			 int x, int y );
+
 extern void generic_expose( struct gwm_window *window,
 			    xcb_expose_event_t *ev );