From 6382172ac01ef17913c54177e556706d6ae2ec7f Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Mon, 23 Oct 2023 17:49:31 +0200
Subject: WindowServer: Draw a border around the active window

---
 userland/windowserver/draw.c | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

(limited to 'userland/windowserver/draw.c')

diff --git a/userland/windowserver/draw.c b/userland/windowserver/draw.c
index 5b3402a..cf3cd99 100644
--- a/userland/windowserver/draw.c
+++ b/userland/windowserver/draw.c
@@ -41,6 +41,25 @@ void draw_mouse(DISPLAY *disp, int mouse_x, int mouse_y) {
   update_full_display(disp, mouse_x, mouse_y);
 }
 
+void draw_line(DISPLAY *disp, int sx, int sy, int dx, int dy, uint32_t color) {
+  int x = sx;
+  int y = sy;
+  for (;;) {
+    // Bounds checking
+    if (y * WIDTH + x > HEIGHT * WIDTH)
+      break;
+
+    if (x >= dx - 1 && y >= dy - 1)
+      break;
+    uint32_t *ptr = disp->back_buffer + (BPP * y * WIDTH) + (x * BPP);
+    *ptr = color;
+    if (x < dx - 1)
+      x++;
+    if (y < dy - 1)
+      y++;
+  }
+}
+
 void draw_window(DISPLAY *disp, const WINDOW *w) {
   int x, y;
   uint8_t border_size = disp->border_size;
@@ -50,6 +69,18 @@ void draw_window(DISPLAY *disp, const WINDOW *w) {
   const int sy = w->sy;
   x = px;
   y = py;
+  // Draw a border around the current selected window
+  if (w == disp->active_window) {
+    // Top
+    draw_line(disp, px - 1, py - 1, px + sx + 1, py - 1, 0xFF00FF);
+    // Bottom
+    draw_line(disp, px - 1, py + sy, px + sx + 1, py + sy, 0xFF00FF);
+    // Left
+    draw_line(disp, px - 1, py - 1, px - 1, py + sy + 1, 0xFF00FF);
+    // Right
+    draw_line(disp, px + sx, py - 1, px + sx, py + sy + 1, 0xFF00FF);
+  }
+
   for (int i = 0; i < sy; i++) {
     if ((i + py) * WIDTH + px > HEIGHT * WIDTH)
       break;
@@ -57,7 +88,6 @@ void draw_window(DISPLAY *disp, const WINDOW *w) {
     if (i * sx > HEIGHT * WIDTH)
       break;
     uint32_t *bm = &w->bitmap_ptr[i * sx];
-    //        ((uint8_t *)w->bitmap_ptr) + BPP * ((i + py) * WIDTH) + px * BPP;
     for (int j = 0; j < sx; j++) {
       ptr[j] = bm[j];
     }
@@ -75,12 +105,7 @@ void update_active_window(DISPLAY *disp) {
 }
 
 void update_full_display(DISPLAY *disp, int mouse_x, int mouse_y) {
-  draw_wallpaper(disp); /*
-   for (int i = 0; i < 100; i++) {
-     if (!disp->windows[i])
-       continue;
-     draw_window(disp, disp->windows[i]);
-   }*/
+  draw_wallpaper(disp);
   update_active_window(disp);
   update_display(disp);
 }
-- 
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