Base rc.title_height on font vertical extents

include/common/font.h

@@ -0,0 +1,10 @@
+#ifndef __LABWC_FONT_H
+#define __LABWC_FONT_H
+
+/*
+ * font_height - get font vertical extents
+ * @font_description: string describing font, for example 'sans 10'
+ */
+int font_height(const char *font_description);
+
+#endif /* __LABWC_FONT_H */

include/config/rcxml.h

@@ -13,6 +13,7 @@ struct rcxml {
 	char *font_name_activewindow;
 	int font_size_activewindow;
 	struct wl_list keybinds;
+	int title_height; /* not set in rc.xml, but derived from font, etc */
 };
 
 extern struct rcxml rc;

meson.build

@@ -43,19 +43,21 @@ xkbcommon       = dependency('xkbcommon')
 xml2            = dependency('libxml-2.0')
 glib            = dependency('glib-2.0')
 cairo           = dependency('cairo')
-pango           = dependency('pango')
+pangocairo      = dependency('pangocairo')
 
 labwc_inc       = include_directories('include')
 
 subdir('protocols')
+
+labwc_deps      = [
+  server_protos, wayland_server, wlroots, xkbcommon, xml2, glib,
+  cairo, pangocairo
+]
+
 subdir('src')
 subdir('tests')
 subdir('docs')
 
-labwc_deps      = [
-  server_protos, wayland_server, wlroots, xkbcommon, xml2, glib, cairo, pango
-]
-
 executable(
   meson.project_name(),
   labwc_sources,

src/common/font.c

@@ -0,0 +1,41 @@
+#include <cairo.h>
+#include <pango/pangocairo.h>
+
+#include "common/font.h"
+
+static PangoRectangle font_extents(const char *font_description,
+				   const char *string)
+{
+	PangoRectangle rect;
+	cairo_surface_t *surface;
+	cairo_t *c;
+	PangoLayout *layout;
+	PangoFontDescription *font;
+
+	surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
+	c = cairo_create(surface);
+	layout = pango_cairo_create_layout(c);
+	font = pango_font_description_from_string(font_description);
+
+	pango_layout_set_font_description(layout, font);
+	pango_layout_set_text(layout, string, -1);
+	pango_layout_set_single_paragraph_mode(layout, TRUE);
+	pango_layout_set_width(layout, -1);
+	pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_MIDDLE);
+	pango_layout_get_extents(layout, NULL, &rect);
+	pango_extents_to_pixels(&rect, NULL);
+
+	/* we put a 2 px edge on each side - because Openbox does it :) */
+	rect.width += 4;
+
+	g_object_unref(layout);
+	pango_font_description_free(font);
+	return rect;
+}
+
+int font_height(const char *font_description)
+{
+	PangoRectangle rectangle;
+	rectangle = font_extents(font_description, "abcdefg");
+	return rectangle.height;
+}

src/common/meson.build

@@ -1,4 +1,5 @@
 labwc_sources += files(
   'buf.c',
+  'font.c',
   'spawn.c',
 )

src/config/rcxml.c

@@ -14,6 +14,7 @@
 #include "config/keybind.h"
 #include "config/config-dir.h"
 #include "common/bug-on.h"
+#include "common/font.h"
 
 static bool in_keybind = false;
 static bool is_attribute = false;
@@ -232,6 +233,14 @@ static void bind(const char *binding, const char *action)
 	fprintf(stderr, "binding: %s: %s\n", binding, action);
 }
 
+static void set_title_height(void)
+{
+	char buf[256];
+	snprintf(buf, sizeof(buf), "%s %d", rc.font_name_activewindow,
+		 rc.font_size_activewindow);
+	rc.title_height = font_height(buf);
+}
+
 static void post_processing(void)
 {
 	if (!wl_list_length(&rc.keybinds)) {
@@ -241,6 +250,8 @@ static void post_processing(void)
 		bind("A-F3", "Execute");
 	}
 	/* TODO: Set all char* variables if NULL */
+
+	set_title_height();
 }
 
 static void rcxml_path(char *buf, size_t len, const char *filename)

src/deco.c

@@ -6,18 +6,18 @@
 
 #include "labwc.h"
 #include "theme/theme.h"
+#include "config/rcxml.h"
 
 /* Based on expected font height of Sans 8 */
-#define TITLE_HEIGHT (14)
 #define BORDER_WIDTH (1)
 
 struct wlr_box deco_max_extents(struct view *view)
 {
 	struct wlr_box box = {
 		.x = view->x - BORDER_WIDTH,
-		.y = view->y - TITLE_HEIGHT - BORDER_WIDTH,
+		.y = view->y - rc.title_height - BORDER_WIDTH,
 		.width = view->surface->current.width + 2 * BORDER_WIDTH,
-		.height = view->surface->current.height + TITLE_HEIGHT +
+		.height = view->surface->current.height + rc.title_height +
 			  2 * BORDER_WIDTH,
 	};
 	return box;
@@ -33,44 +33,44 @@ struct wlr_box deco_box(struct view *view, enum deco_part deco_part)
 	switch (deco_part) {
 	case LAB_DECO_BUTTON_CLOSE:
 		wlr_texture_get_size(theme.xbm_close, &box.width, &box.height);
-		margin = (TITLE_HEIGHT - box.height) / 2;
+		margin = (rc.title_height - box.height) / 2;
 		box.x = view->x + view->surface->current.width + margin -
-			TITLE_HEIGHT;
-		box.y = view->y - TITLE_HEIGHT + margin;
+			rc.title_height;
+		box.y = view->y - rc.title_height + margin;
 		break;
 	case LAB_DECO_BUTTON_MAXIMIZE:
 		wlr_texture_get_size(theme.xbm_maximize, &box.width,
 				     &box.height);
-		margin = (TITLE_HEIGHT - box.height) / 2;
+		margin = (rc.title_height - box.height) / 2;
 		box.x = view->x + view->surface->current.width + margin -
-			TITLE_HEIGHT * 2;
-		box.y = view->y - TITLE_HEIGHT + margin;
+			rc.title_height * 2;
+		box.y = view->y - rc.title_height + margin;
 		break;
 	case LAB_DECO_BUTTON_ICONIFY:
 		wlr_texture_get_size(theme.xbm_iconify, &box.width,
 				     &box.height);
-		margin = (TITLE_HEIGHT - box.height) / 2;
+		margin = (rc.title_height - box.height) / 2;
 		box.x = view->x + view->surface->current.width + margin -
-			TITLE_HEIGHT * 3;
-		box.y = view->y - TITLE_HEIGHT + margin;
+			rc.title_height * 3;
+		box.y = view->y - rc.title_height + margin;
 		break;
 	case LAB_DECO_PART_TITLE:
 		box.x = view->x;
-		box.y = view->y - TITLE_HEIGHT;
+		box.y = view->y - rc.title_height;
 		box.width = view->surface->current.width;
-		box.height = TITLE_HEIGHT;
+		box.height = rc.title_height;
 		break;
 	case LAB_DECO_PART_TOP:
 		box.x = view->x - BORDER_WIDTH;
-		box.y = view->y - TITLE_HEIGHT - BORDER_WIDTH;
+		box.y = view->y - rc.title_height - BORDER_WIDTH;
 		box.width = view->surface->current.width + 2 * BORDER_WIDTH;
 		box.height = BORDER_WIDTH;
 		break;
 	case LAB_DECO_PART_RIGHT:
 		box.x = view->x + view->surface->current.width;
-		box.y = view->y - TITLE_HEIGHT;
+		box.y = view->y - rc.title_height;
 		box.width = BORDER_WIDTH;
-		box.height = view->surface->current.height + TITLE_HEIGHT;
+		box.height = view->surface->current.height + rc.title_height;
 		break;
 	case LAB_DECO_PART_BOTTOM:
 		box.x = view->x - BORDER_WIDTH;
@@ -80,9 +80,9 @@ struct wlr_box deco_box(struct view *view, enum deco_part deco_part)
 		break;
 	case LAB_DECO_PART_LEFT:
 		box.x = view->x - BORDER_WIDTH;
-		box.y = view->y - TITLE_HEIGHT;
+		box.y = view->y - rc.title_height;
 		box.width = BORDER_WIDTH;
-		box.height = view->surface->current.height + TITLE_HEIGHT;
+		box.height = view->surface->current.height + rc.title_height;
 		break;
 	default:
 		break;

tests/meson.build

@@ -4,9 +4,10 @@ rcxml_lib = static_library(
     '../src/config/rcxml.c',
     '../src/config/keybind.c',
     '../src/config/config-dir.c',
-    '../src/common/buf.c'
+    '../src/common/buf.c',
+    '../src/common/font.c',
   ),
-  dependencies: [xml2, wayland_server, xkbcommon, glib, wlroots],
+  dependencies: labwc_deps,
   include_directories: [labwc_inc],
 )
 

tools/pango/.gitignore

@@ -0,0 +1,2 @@
+*.o
+font-height

tools/pango/Makefile

@@ -0,0 +1,15 @@
+CFLAGS += -g -Wall -O0 -std=c11
+CFLAGS += `pkg-config cairo pango pangocairo --cflags`
+CFLAGS += -I../../include
+LIBS   += `pkg-config cairo pango pangocairo --libs`
+LDFLAGS += $(LIBS)
+
+PROGS = font-height
+
+all: $(PROGS)
+
+font-height: font-height.c ../../src/common/font.c
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -f $(PROGS) *.o

tools/pango/font-height.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common/font.h"
+
+int main(int argc, char **argv)
+{
+	if (argc < 2) {
+		printf("Usage: %s <font-description> (e.g. 'sans 10')\n", argv[0]);
+		exit(1);
+	}
+	printf("height=%d\n", font_height(argv[1]));
+}