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commit 92cf19d476acbe3042c964af856ff30c30780c91
parent e0d2f71483e2745237424d34593b13e4f91deb4e
Author: RiciT <tamas.balint.farago@gmail.com>
Date:   Fri,  1 May 2026 17:10:54 +0200

[slock][patch] Added new patch that fetches and sets 'feh' background

Patch that is used with the Background Image patch and the feh tool
to dynamically change the lock screen background to the current
background.

Diffstat:
A
tools.suckless.org/slock/patches/feh-background/index.md
 | 
21
+++++++++++++++++++++
A
tools.suckless.org/slock/patches/feh-background/slock-feh-background-1.6.diff
 | 
99
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 120 insertions(+), 0 deletions(-)
diff --git a/tools.suckless.org/slock/patches/feh-background/index.md b/tools.suckless.org/slock/patches/feh-background/index.md
@@ -0,0 +1,21 @@
+Feh Background
+================
+
+Description
+-----------
+
+This patch allows you to use the current background set with the 'feh' tool as your lock screen. It is useful as the lock screen image changes dynamically if you change your background or if you automatically cycle your background with 'feh'.
+
+> IMPORTANT: This patch depends on the Background Image patch (current available version: slock-background-image-20220318-1c5a538), to use this patch first apply the background-image patch and then this one.
+
+> Note: The .fehbg file should be accessible by the specified user
+
+Download
+--------
+
+* [slock-feh-background-1.6.diff](slock-feh-background-1.6.diff)
+
+Author
+------
+
+* Tamas Farago - <tamas.balint.farago@gmail.com>
diff --git a/tools.suckless.org/slock/patches/feh-background/slock-feh-background-1.6.diff b/tools.suckless.org/slock/patches/feh-background/slock-feh-background-1.6.diff
@@ -0,0 +1,99 @@
+diff --color -up a/config.def.h b/config.def.h
+--- a/config.def.h
++++ b/config.def.h
+@@ -1,6 +1,6 @@
+ /* user and group to drop privileges to */
+ static const char *user  = "nobody";
+-static const char *group = "nobody";
++static const char *group = "nogroup";
+ 
+ static const char *colorname[NUMCOLS] = {
+ 	[INIT] =   "black",     /* after initialization */
+@@ -13,3 +13,6 @@ static const int failonclear = 1;
+ 
+ /* Background image path, should be available to the user above */
+ static const char* background_image = "";
++
++/* Path to .fehbg (default: /home/user/.fehbg), should be available to the user above */
++static const char *fehbg_home_path = "";
+diff --color -up a/slock.c b/slock.c
+--- a/slock.c
++++ b/slock.c
+@@ -129,6 +129,40 @@ gethash(void)
+ 	return hash;
+ }
+ 
++static char *
++get_fehbg_path(const char *fehbg_file) 
++{
++  FILE *file = fopen(fehbg_file, "r");
++  if (file == NULL) {
++    return NULL;
++  }
++
++  char buffer[500];
++  char *path = NULL;
++
++  while (fgets(buffer, sizeof(buffer), file) != NULL) {
++    /* Look for the first single quote */
++    char *start = strchr(buffer, '\'');
++    if (start != NULL) {
++      /* Look for the closing single quote */
++      char *end = strchr(start + 1, '\'');
++      if (end != NULL) {
++        size_t len = end - start - 1;
++        path = (char *)malloc(len + 1);
++        if (path != NULL) {
++          strncpy(path, start + 1, len);
++          path[len] = '\0';
++        }
++        break;
++      }
++    }
++  }
++
++  fclose(file);
++  return path;
++}
++
++
+ static void
+ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+        const char *hash)
+@@ -378,6 +412,7 @@ main(int argc, char **argv) {
+ 		die("slock: setuid: %s\n", strerror(errno));
+ 
+ 	/* Load picture */
++    background_image = get_fehbg_path(fehbg_home_path);
+         Imlib_Image buffer = imlib_load_image(background_image);
+ 	imlib_context_set_image(buffer);
+         int background_image_width = imlib_image_get_width();
+@@ -395,7 +430,27 @@ main(int argc, char **argv) {
+ 
+         int i;
+         for (i = 0; i < number_of_monitors; i++) {
+-            imlib_blend_image_onto_image(buffer, 0, 0, 0, background_image_width, background_image_height, monitors[i].x, monitors[i].y, monitors[i].width, monitors[i].height);
++            int m_x = monitors[i].x;
++            int m_y = monitors[i].y;
++            int m_w = monitors[i].width;
++            int m_h = monitors[i].height;
++
++            int s_x = 0;
++            int s_y = 0;
++            int s_w = background_image_width;
++            int s_h = background_image_height;
++
++            /* This implements a stretching behaviour for the given image,
++             * it should not be hard to modify and achieve different effects */
++            if ((double)m_w / m_h > (double)s_w / s_h) {
++              s_h = (s_w * m_h) / m_w;
++              s_y = (background_image_height - s_h) / 2;
++            } else {
++              s_w = (s_h * m_w) / m_h;
++              s_x = (background_image_width - s_w) / 2;
++            }
++            
++            imlib_blend_image_onto_image(buffer, 0, s_x, s_y, s_w, s_h, m_x, m_y, m_w, m_h);
+         }
+ 
+         /* Clean up */