cairo-util: Draw solid titlebar for frames with only buttons

Previously geometry was changed to leave space for titlebar if a frame
has only buttons but no title. This patch fixes theme_render_frame to
avoid transparent titlebar.

Signed-off-by: Boyan Ding <stu_dby@126.com>

shared/cairo-util.c

@@ -28,6 +28,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <math.h>
+#include <wayland-util.h>
 #include <cairo.h>
 #include "cairo-util.h"
 
@@ -413,7 +414,8 @@ theme_destroy(struct theme *t)
 void
 theme_render_frame(struct theme *t,
 		   cairo_t *cr, int width, int height,
-		   const char *title, uint32_t flags)
+		   const char *title, struct wl_list *buttons,
+		   uint32_t flags)
 {
 	cairo_text_extents_t extents;
 	cairo_font_extents_t font_extents;
@@ -439,7 +441,7 @@ theme_render_frame(struct theme *t,
 	else
 		source = t->inactive_frame;
 
-	if (title)
+	if (title || !wl_list_empty(buttons))
 		top_margin = t->titlebar_height;
 	else
 		top_margin = t->width;
@@ -449,7 +451,7 @@ theme_render_frame(struct theme *t,
 		    width - margin * 2, height - margin * 2,
 		    t->width, top_margin);
 
-	if (title) {
+	if (title || !wl_list_empty(buttons)) {
 		cairo_rectangle (cr, margin + t->width, margin,
 				 width - (margin + t->width) * 2,
 				 t->titlebar_height - t->width);

shared/cairo-util.h

@@ -26,6 +26,8 @@
 #include <stdint.h>
 #include <cairo.h>
 
+#include <wayland-util.h>
+
 void
 surface_flush_device(cairo_surface_t *surface);
 
@@ -69,7 +71,8 @@ theme_set_background_source(struct theme *t, cairo_t *cr, uint32_t flags);
 void
 theme_render_frame(struct theme *t, 
 		   cairo_t *cr, int width, int height,
-		   const char *title, uint32_t flags);
+		   const char *title, struct wl_list *buttons,
+		   uint32_t flags);
 
 enum theme_location {
 	THEME_LOCATION_INTERIOR = 0,

shared/frame.c

@@ -853,7 +853,7 @@ frame_repaint(struct frame *frame, cairo_t *cr)
 
 	cairo_save(cr);
 	theme_render_frame(frame->theme, cr, frame->width, frame->height,
-			   frame->title, flags);
+			   frame->title, &frame->buttons, flags);
 	cairo_restore(cr);
 
 	wl_list_for_each(button, &frame->buttons, link)