From 27f513920f90d1181883aaf5fd3fd546cdbf64df Mon Sep 17 00:00:00 2001
From: Utkarsh Verma <utkarshverma@protonmail.com>
Date: Thu, 2 Jun 2022 09:09:14 +0530
Subject: [PATCH] Refresh terminal after updating alpha

---
 box-drawing.c | 16 +++++++---------
 config.c      |  2 +-
 terminal.c    |  9 +++++++--
 util.h        |  1 +
 4 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/box-drawing.c b/box-drawing.c
index 3962e341..8c12c688 100644
--- a/box-drawing.c
+++ b/box-drawing.c
@@ -15,8 +15,6 @@
 #include "util.h"
 #include "xmalloc.h"
 
-#define clamp(x, lower, upper) (min(upper, max(x, lower)))
-
 enum thickness {
     LIGHT,
     HEAVY,
@@ -1281,17 +1279,17 @@ draw_box_drawings_light_arc(struct buf *buf, char32_t wc)
      * The general idea here is to connect the two incoming lines using a
      * circle, which is extended to the box-edges with vertical/horizontal
      * lines.
-     * 
+     *
      * The radius of the quartercircle should be as big as possible, with some
      * restrictions: The radius should be the same for all of ╭ ╮ ╯ ╰ at a
      * given box-size (which won't be the case if we choose the biggest
      * possible radius for a given box, consider the following:)
-     * 
-     * 
+     *
+     *
      * ▕  ███   ▏
-     * ▕a  │   d▔▔ 
-     * ▕   │  x 
-     * ▕   │    
+     * ▕a  │   d▔▔
+     * ▕   │  x
+     * ▕   │
      * ▕   │    ██
      * ▕   ╰────██
      * ▕        ██
@@ -1302,7 +1300,7 @@ draw_box_drawings_light_arc(struct buf *buf, char32_t wc)
      * for ╰ it would be possible to center the circle on the upper right
      * corner of d, but we have set it on x instead because ╯ can only use a
      * 2px inner radius:
-     * 
+     *
      *  ▕  ███   ▏
      * ▔▔a  │   d▏
      *   x  │    ▏
diff --git a/config.c b/config.c
index e8fd9325..26f3b988 100644
--- a/config.c
+++ b/config.c
@@ -1190,7 +1190,7 @@ parse_section_colors(struct context *ctx)
             return false;
         }
 
-        conf->colors.alpha = alpha * 65535.;
+        conf->colors.alpha = alpha * UINT16_MAX;
         return true;
     }
 
diff --git a/terminal.c b/terminal.c
index 665ff118..f35d38d3 100644
--- a/terminal.c
+++ b/terminal.c
@@ -2005,17 +2005,22 @@ term_font_size_reset(struct terminal *term)
     return load_fonts_from_conf(term);
 }
 
+#define ALPHA_STEP (0.05 * UINT16_MAX)
 bool
 term_alpha_increase(struct terminal *term)
 {
-    term->colors.alpha += 0.05;
+    term->colors.alpha = clamp(term->colors.alpha + ALPHA_STEP, 0, UINT16_MAX);
+    term->render.last_buf = NULL;
+    render_refresh(term);
     return true;
 }
 
 bool
 term_alpha_decrease(struct terminal *term)
 {
-    term->colors.alpha -= 0.05;
+    term->colors.alpha = clamp(term->colors.alpha - ALPHA_STEP, 0, UINT16_MAX);
+    term->render.last_buf = NULL;
+    render_refresh(term);
     return true;
 }
 
diff --git a/util.h b/util.h
index 683dbd4a..e98b013e 100644
--- a/util.h
+++ b/util.h
@@ -6,6 +6,7 @@
 #define ALEN(v) (sizeof(v) / sizeof((v)[0]))
 #define min(x, y) ((x) < (y) ? (x) : (y))
 #define max(x, y) ((x) > (y) ? (x) : (y))
+#define clamp(x, lower, upper) (min(upper, max(x, lower)))
 
 static inline const char *
 thrd_err_as_string(int thrd_err)