From 89cca2a5d1015670ee2fd335c7b38e8aabdaed44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Sat, 8 Feb 2020 14:09:06 +0100
Subject: [PATCH] term: add term_font_size_{increase,decrease}()

---
 terminal.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 terminal.h | 16 ++++++++++------
 2 files changed, 54 insertions(+), 6 deletions(-)

diff --git a/terminal.c b/terminal.c
index ad8ba085..75b400d3 100644
--- a/terminal.c
+++ b/terminal.c
@@ -603,6 +603,7 @@ term_init(const struct config *conf, struct fdm *fdm, struct wayland *wayl,
     /* Initialize configure-based terminal attributes */
     *term = (struct terminal) {
         .fdm = fdm,
+        .conf = conf,
         .quit = false,
         .ptmx = ptmx,
         .ptmx_buffer = tll_init(),
@@ -1099,6 +1100,49 @@ term_reset(struct terminal *term, bool hard)
     term_damage_all(term);
 }
 
+static void
+term_font_size_adjust(struct terminal *term, double amount)
+{
+    struct font *fonts[4] = {
+        font_size_adjust(term->fonts[0], amount),
+        font_size_adjust(term->fonts[1], amount),
+        font_size_adjust(term->fonts[2], amount),
+        font_size_adjust(term->fonts[3], amount),
+    };
+
+    if (fonts[0] == NULL || fonts[1] == NULL ||
+        fonts[2] == NULL || fonts[3] == NULL)
+    {
+        for (size_t i = 0; i < 4; i++)
+            font_destroy(fonts[i]);
+        return;
+    }
+
+    for (size_t i = 0; i < 4; i++) {
+        font_destroy(term->fonts[i]);
+        term->fonts[i] = fonts[i];
+    }
+
+    term->cell_width = term->fonts[0]->space_x_advance > 0
+        ? term->fonts[0]->space_x_advance : term->fonts[0]->max_x_advance;
+    term->cell_height = term->fonts[0]->height;
+    LOG_INFO("cell width=%d, height=%d", term->cell_width, term->cell_height);
+
+    render_resize_force(term, term->width, term->height);
+}
+
+void
+term_font_size_increase(struct terminal *term)
+{
+    term_font_size_adjust(term, 1.);
+}
+
+void
+term_font_size_decrease(struct terminal *term)
+{
+    term_font_size_adjust(term, -1.);
+}
+
 void
 term_damage_rows(struct terminal *term, int start, int end)
 {
diff --git a/terminal.h b/terminal.h
index cf691f5e..e98b14c1 100644
--- a/terminal.h
+++ b/terminal.h
@@ -175,11 +175,18 @@ struct ptmx_buffer {
 
 struct terminal {
     struct fdm *fdm;
+    const struct config *conf;
 
     pid_t slave;
     int ptmx;
     bool quit;
 
+    struct grid normal;
+    struct grid alt;
+    struct grid *grid;
+
+    struct font *fonts[4];
+
     tll(struct ptmx_buffer) ptmx_buffer;
 
     enum cursor_keys cursor_keys_mode;
@@ -277,12 +284,6 @@ struct terminal {
         size_t match_len;
     } search;
 
-    struct grid normal;
-    struct grid alt;
-    struct grid *grid;
-
-    struct font *fonts[4];
-
     struct {
         bool esc_prefix;
         bool eight_bit;
@@ -362,6 +363,9 @@ int term_destroy(struct terminal *term);
 void term_reset(struct terminal *term, bool hard);
 bool term_to_slave(struct terminal *term, const void *data, size_t len);
 
+void term_font_size_increase(struct terminal *term);
+void term_font_size_decrease(struct terminal *term);
+
 void term_damage_rows(struct terminal *term, int start, int end);
 void term_damage_rows_in_view(struct terminal *term, int start, int end);