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.

1 files changed, 15 insertions, 6 deletions

diff --git a/sway/config.c b/sway/config.c
index 89701640..6ff4da03 100644
--- a/sway/config.c
+++ b/sway/config.c
@@ -807,22 +807,31 @@ int workspace_output_cmp_workspace(const void *a, const void *b) {
         return lenient_strcmp(wsa->workspace, wsb->workspace);
 }
 
-static void find_font_height_iterator(struct sway_container *container,
-                void *data) {
+static void find_font_height_iterator(struct sway_container *con, void *data) {
+        size_t amount_below_baseline = con->title_height - con->title_baseline;
+        size_t extended_height = config->font_baseline + amount_below_baseline;
+        if (extended_height > config->font_height) {
+                config->font_height = extended_height;
+        }
+}
+
+static void find_baseline_iterator(struct sway_container *con, void *data) {
         bool *recalculate = data;
         if (*recalculate) {
-                container_calculate_title_height(container);
+                container_calculate_title_height(con);
         }
-        if (container->title_height > config->font_height) {
-                config->font_height = container->title_height;
+        if (con->title_baseline > config->font_baseline) {
+                config->font_baseline = con->title_baseline;
         }
 }
 
 void config_update_font_height(bool recalculate) {
         size_t prev_max_height = config->font_height;
         config->font_height = 0;
+        config->font_baseline = 0;
 
-        root_for_each_container(find_font_height_iterator, &recalculate);
+        root_for_each_container(find_baseline_iterator, &recalculate);
+        root_for_each_container(find_font_height_iterator, NULL);
 
         if (config->font_height != prev_max_height) {
                 arrange_root();