From 68ef49366f267bc9f93ba779639022a5e171d375 Mon Sep 17 00:00:00 2001
From: Federico Angelilli <code@fedang.net>
Date: Wed, 15 Nov 2023 17:55:37 +0100
Subject: Add pango for text rendering and move size calculations to main

---
 Makefile |  3 +--
 comet.c  | 14 ++++++++++++++
 draw.c   | 53 ++++++++++++++++++++++++++++++++++++++---------------
 draw.h   |  2 ++
 4 files changed, 55 insertions(+), 17 deletions(-)

diff --git a/Makefile b/Makefile
index f657052..6ea520e 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,6 @@ OBJ = $(SRC:.c=.o)
 BIN = comet.bin
 
 DEPS = \
-	cairo \
 	xcb \
 	xcb-icccm \
 	xcb-ewmh \
@@ -12,7 +11,7 @@ DEPS = \
 	xcb-errors \
 	"xcb-randr >= 1.5" \
 	"glib-2.0 >= 2.44" \
-	gio-2.0
+	pangocairo
 
 CFLAGS  := $(shell pkg-config --cflags $(DEPS)) -ggdb
 LDFLAGS := $(shell pkg-config --libs $(DEPS)) -lm
diff --git a/comet.c b/comet.c
index 5cc7734..85bdb27 100644
--- a/comet.c
+++ b/comet.c
@@ -1,3 +1,4 @@
+#include <math.h>
 #include <glib.h>
 #include <glib-unix.h>
 
@@ -5,6 +6,8 @@
 #include "log.h"
 #include "draw.h"
 
+#define EVEN(n) ((int)(n) - ((int)(n) % 2 != 0))
+
 static gboolean mainloop_quit(gpointer data)
 {
         g_main_loop_quit(data);
@@ -25,6 +28,17 @@ int main(int argc, char **argv)
 
     Window *win = window_create();
 
+    int screen_width, screen_height;
+    window_get_screen_size(win, &screen_width, &screen_height);
+
+    int height = EVEN(round(screen_height * 0.021));
+    int x_padding = EVEN(round(screen_width * 0.005));
+    int y_padding = EVEN(round(screen_height * 0.004));
+
+    log_debug("Calculated dimensions [height=%d, x_pad=%d, y_pad=%d]", height, x_padding, y_padding);
+
+    draw_init("Hack 12", height, x_padding, y_padding);
+
     guint source_term = g_unix_signal_add(SIGTERM, mainloop_quit, mainloop);
     guint source_int  = g_unix_signal_add(SIGINT,  mainloop_quit, mainloop);
 
diff --git a/draw.c b/draw.c
index 07aecb3..afd727e 100644
--- a/draw.c
+++ b/draw.c
@@ -1,10 +1,25 @@
 #include <math.h>
-#include <cairo.h>
+#include <pango/pangocairo.h>
+#include <pango/pango-font.h>
+#include <pango/pango-types.h>
 
 #include "x11.h"
 #include "log.h"
 
-#define EVEN(n) ((int)(n) - ((int)(n) % 2 != 0))
+// Make this a state passed to draw
+int draw_height, draw_x_padding, draw_y_padding;
+PangoFontDescription *desc;
+
+void draw_init(const char *font, int height, int x_padding, int y_padding)
+{
+    log_debug("Pango loading font description '%s'", font);
+    desc = pango_font_description_from_string(font);
+    log_debug("Pango found matching font '%s'", pango_font_description_get_family(desc));
+
+    draw_height = height;
+    draw_x_padding = x_padding;
+    draw_y_padding = y_padding;
+}
 
 void draw(Window *win)
 {
@@ -13,8 +28,8 @@ void draw(Window *win)
     int screen_width, screen_height;
     window_get_screen_size(win, &screen_width, &screen_height);
 
-    int width  = EVEN(round(screen_width  * 0.9875 * scale));
-    int height = EVEN(round(screen_height * 0.0225 * scale));
+    int width  = round((screen_width - 2 * draw_x_padding) * scale);
+    int height = round(draw_height * scale);
 
     cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 
@@ -43,6 +58,9 @@ void draw(Window *win)
 
     for (int i = 0; i < 9; i++) {
 
+        PangoLayout *layout = pango_cairo_create_layout (cr);
+        pango_layout_set_font_description(layout, desc);
+
         int x = (height + cairo_get_line_width(cr) * scale * 2) * i;
 
         // purple
@@ -54,24 +72,29 @@ void draw(Window *win)
         cairo_arc(cr, x + radius, radius, radius - 1, 0 * degree, 360 * degree);
         cairo_stroke(cr);
 
-        cairo_select_font_face(cr, "Hack", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
-        cairo_set_source_rgb(cr, 1, 1, 1);
-        cairo_set_font_size(cr, 20.0);
-
         char btn[] = { '1' + i, '\0' };
+        pango_layout_set_text(layout, btn, -1);
+
+
+        int text_w, text_h;
+        pango_layout_get_pixel_size(layout, &text_w, &text_h);
+        text_w = ceil(text_w / scale);
+        text_h = ceil(text_h / scale);
+
+        int text_x = x + radius - (text_w / 2);
+        int text_y = radius - (text_h / 2);
+        cairo_move_to(cr, text_x, text_y);
 
-        cairo_text_extents_t te;
-        cairo_text_extents(cr, btn, &te);
+        pango_cairo_update_layout(cr, layout);
+        pango_cairo_show_layout(cr, layout);
 
-        cairo_move_to(cr, x + (height / 2) - te.x_bearing - te.width / 2,
-                          (height / 2) - te.y_bearing - te.height / 2);
-        cairo_show_text(cr, btn);
+        g_object_unref(layout);
     }
 
     cairo_destroy(cr);
 
-    int x = EVEN((screen_width - width) / 2.0);
-    int y = EVEN(screen_height * 0.005);
+    int x = draw_x_padding;
+    int y = draw_y_padding;
 
     // TODO: Move these somewhere else
     window_move(win, x, y);
diff --git a/draw.h b/draw.h
index daccfde..929fecb 100644
--- a/draw.h
+++ b/draw.h
@@ -3,6 +3,8 @@
 
 #include "x11.h"
 
+void draw_init(const char *font, int height, int x_padding, int y_padding);
+
 void draw(Window *win);
 
 #endif
-- 
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