From 6198c03746c3adcb1cf54b9c89440304a21c0e6f Mon Sep 17 00:00:00 2001
From: Hugo Villeneuve <hugo@hugovil.com>
Date: Sun, 2 Jan 2022 17:42:39 -0500
Subject: [PATCH] Change text rendering from cairo to pango

---
 src/batmon.c | 45 +++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)

diff --git a/src/batmon.c b/src/batmon.c
index 024a763..203bc07 100644
--- a/src/batmon.c
+++ b/src/batmon.c
@@ -62,6 +62,10 @@
 #define BAT_LOW_LEVEL 20
 #define BAT_CRITICAL_LEVEL 10
 
+#define FONT_NAME "Sans Condensed Bold"
+#define FONT_SIZE 9
+
+static int font_size;
 static int capacity;
 static int ac_online = false;
 static const char battery[] = "BAT0";
@@ -172,19 +176,30 @@ color_set_yellow(cairo_t *cr)
 }
 
 static void
-display_string(cairo_t *cr, char *str, int center_x, int center_y)
+display_string_pango(cairo_t *cr, char *str, int center_x, int center_y)
 {
-	cairo_text_extents_t extents;
-	double xx, yy;
+	PangoLayout *layout;
+	PangoFontDescription *desc;
+	int x, y;
+	char font[256];
+
+	sprintf(font, "%s %d", FONT_NAME, font_size);
+
+	/* Create a PangoLayout, set the font and text */
+	layout = pango_cairo_create_layout(cr);
+	pango_layout_set_text(layout, str, -1);
+	desc = pango_font_description_from_string(font);
+	pango_layout_set_font_description(layout, desc);
+	pango_font_description_free(desc);
 
 	/* Get string dimensions */
-	cairo_text_extents(cr, str, &extents);
+	pango_layout_get_pixel_size(layout, &x, &y);
 
-	xx = (extents.width  / 2) + 1;
-	yy = extents.height / 2;
+	cairo_move_to(cr, center_x + 1 - (x / 2), center_y - (y / 2));
 
-	cairo_move_to(cr, center_x - xx, center_y + yy);
-	cairo_show_text(cr, str);
+	pango_cairo_show_layout(cr, layout);
+
+	g_object_unref(layout);
 }
 
 static void
@@ -194,15 +209,13 @@ display_capacity(cairo_t *cr)
 	int center_x = 32;
 	int center_y = 32;
 
-	cairo_select_font_face(cr, "serif", CAIRO_FONT_SLANT_NORMAL,
-			       CAIRO_FONT_WEIGHT_BOLD);
-	cairo_set_font_size(cr, 10);
+	font_size = FONT_SIZE;
 
 	/* Convert digit to string */
-	if (capacity == 100)
-		sprintf(str, "F");
-	else
-		sprintf(str, "%d%%", capacity);
+	if (capacity >= 100)
+		font_size -= 1;
+
+	sprintf(str, "%d%%", capacity);
 
 	if (capacity <= 40) {
 		color_set_white(cr);
@@ -212,7 +225,7 @@ display_capacity(cairo_t *cr)
 		center_y += 15;
 	}
 
-	display_string(cr, str, center_x, center_y);
+	display_string_pango(cr, str, center_x, center_y);
 }
 
 static void
-- 
2.20.1