Align titles to baseline

This does the following:

* Adds a baseline argument to get_text_size (the baseline is the
distance from the top of the texture to the baseline).
* Stores the baseline in the container when calculating the title
height.
* Takes the baseline into account when calculating the config's max font
height.
* When rendering, pads the textures according to the baseline so they
line up.

3 files changed, 3 insertions, 1 deletions

diff --git a/include/pango.h b/include/pango.h
index 4492f01e..09a535a5 100644
--- a/include/pango.h
+++ b/include/pango.h
@@ -20,7 +20,7 @@ int escape_markup_text(const char *src, char *dest, int dest_length);
 PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
                 const char *text, double scale, bool markup);
 void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
-                double scale, bool markup, const char *fmt, ...);
+                int *baseline, double scale, bool markup, const char *fmt, ...);
 void pango_printf(cairo_t *cairo, const char *font,
                 double scale, bool markup, const char *fmt, ...);
 
diff --git a/include/sway/config.h b/include/sway/config.h
index 2fef0081..b52bb681 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -349,6 +349,7 @@ struct sway_config {
         enum sway_container_layout default_layout;
         char *font;
         size_t font_height;
+        size_t font_baseline;
         bool pango_markup;
         size_t urgent_timeout;
         enum sway_fowa focus_on_window_activation;
diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index 6efecf7c..2735daa3 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -117,6 +117,7 @@ struct sway_container {
         struct wlr_texture *title_unfocused;
         struct wlr_texture *title_urgent;
         size_t title_height;
+        size_t title_baseline;
 
         struct {
                 struct wl_signal destroy;