font: render with pango for better fontconfig support

.build.yml

@@ -4,6 +4,7 @@ packages:
   - wayland
   - wayland-protocols
   - cairo
+  - pango
   - libxkbcommon
 sources:
   - https://github.com/emerison/slurp

meson.build

@@ -12,6 +12,7 @@ add_project_arguments('-Wno-unused-parameter', language: 'c')
 cc = meson.get_compiler('c')
 
 cairo = dependency('cairo')
+pangocairo = dependency('pangocairo')
 realtime = cc.find_library('rt')
 wayland_client = dependency('wayland-client')
 wayland_cursor = dependency('wayland-cursor')
@@ -30,6 +31,7 @@ executable(
 	],
 	dependencies: [
 		cairo,
+		pangocairo,
 		realtime,
 		wayland_client,
 		wayland_cursor,

render.c

@@ -1,6 +1,6 @@
 #include <cairo/cairo.h>
+#include <pango/pangocairo.h>
 #include <stdio.h>
-#include <stdlib.h>
 
 #include "pool-buffer.h"
 #include "render.h"
@@ -71,18 +71,23 @@ void render(struct slurp_output *output) {
 		cairo_stroke(cairo);
 
 		if (state->display_dimensions) {
-			cairo_select_font_face(cairo, state->font_family,
-					       CAIRO_FONT_SLANT_NORMAL,
-					       CAIRO_FONT_WEIGHT_NORMAL);
-			cairo_set_font_size(cairo, 14);
 			set_source_u32(cairo, state->colors.border);
 			// buffer of 12 can hold selections up to 99999x99999
 			char dimensions[12];
-			snprintf(dimensions, sizeof(dimensions), "%ix%i",
-				 b.width, b.height);
-			cairo_move_to(cairo, b.x + b.width + 10,
-				      b.y + b.height + 20);
-			cairo_show_text(cairo, dimensions);
+			snprintf(dimensions, sizeof(dimensions), "%ix%i", b.width, b.height);
+
+			PangoLayout *layout = pango_cairo_create_layout (cairo);
+			PangoFontDescription *desc = pango_font_description_new();
+			pango_font_description_set_family_static(desc, state->font_family);
+			pango_font_description_set_size(desc, 11 * PANGO_SCALE);
+			pango_font_description_set_style(desc, PANGO_STYLE_NORMAL);
+			pango_font_description_set_weight(desc, PANGO_WEIGHT_NORMAL);
+			pango_layout_set_font_description (layout, desc);
+			pango_font_description_free (desc);
+
+			cairo_move_to(cairo, b.x + b.width + 12, b.y + b.height + 8);
+			pango_layout_set_text (layout, dimensions, -1);
+			pango_cairo_show_layout (cairo, layout);
 		}
 	}
 }