win: expose information about monitors to animation script

Define script context variables describing the monitor a window is on.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

Author: yshui

src/win.c

@@ -2190,13 +2190,22 @@ void unmap_win_start(struct managed_win *w) {
 
 struct win_script_context
 win_script_context_prepare(struct session *ps, struct managed_win *w) {
+	auto monitor =
+	    (w->randr_monitor >= 0 && w->randr_monitor < ps->monitors.count)
+	        ? *pixman_region32_extents(&ps->monitors.regions[w->randr_monitor])
+	        : (pixman_box32_t){
+	              .x1 = 0, .y1 = 0, .x2 = ps->root_width, .y2 = ps->root_height};
 	struct win_script_context ret = {
 	    .x = w->g.x,
 	    .y = w->g.y,
 	    .width = w->widthb,
 	    .height = w->heightb,
 	    .opacity = win_calc_opacity_target(ps, w),
 	    .opacity_before = w->opacity,
+	    .monitor_x = monitor.x1,
+	    .monitor_y = monitor.y1,
+	    .monitor_width = monitor.x2 - monitor.x1,
+	    .monitor_height = monitor.y2 - monitor.y1,
 	};
 	return ret;
 }

src/win.h

@@ -317,6 +317,8 @@ struct managed_win {
 struct win_script_context {
 	double x, y, width, height;
 	double opacity_before, opacity;
+	double monitor_x, monitor_y;
+	double monitor_width, monitor_height;
 };
 
 static const struct script_context_info win_script_context_info[] = {
@@ -326,6 +328,10 @@ static const struct script_context_info win_script_context_info[] = {
     {"window-height", offsetof(struct win_script_context, height)},
     {"window-raw-opacity-before", offsetof(struct win_script_context, opacity_before)},
     {"window-raw-opacity", offsetof(struct win_script_context, opacity)},
+    {"window-monitor-x", offsetof(struct win_script_context, monitor_x)},
+    {"window-monitor-y", offsetof(struct win_script_context, monitor_y)},
+    {"window-monitor-width", offsetof(struct win_script_context, monitor_width)},
+    {"window-monitor-height", offsetof(struct win_script_context, monitor_height)},
     {NULL, 0}        //
 };