Add quirk for forcing fbdev refresh

Fixes: #34

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - feat: Add man page (#6, thanks @Jarrah)
 - feat!: Enable direct rendering
+- feat: Add quirk for forcing fbdev refresh (#34, thanks @calebccff)
 
 ## 1.0.0 (2023-03-14)
 

config.c

@@ -230,7 +230,11 @@ static int parsing_handler(void* user_data, const char* section, const char* key
             }
         }
     } else if (strcmp(section, "quirks") == 0) {
-        if (strcmp(key, "terminal_prevent_graphics_mode") == 0) {
+        if (strcmp(key, "fbdev_force_refresh") == 0) {
+            if (parse_bool(value, &(opts->quirks.fbdev_force_refresh))) {
+                return 1;
+            }
+        } else if (strcmp(key, "terminal_prevent_graphics_mode") == 0) {
             if (parse_bool(value, &(opts->quirks.terminal_prevent_graphics_mode))) {
                 return 1;
             }
@@ -278,6 +282,7 @@ void ul_config_init_opts(ul_config_opts *opts) {
     opts->input.keyboard = true;
     opts->input.pointer = true;
     opts->input.touchscreen = true;
+    opts->quirks.fbdev_force_refresh = false;
     opts->quirks.terminal_prevent_graphics_mode = false;
     opts->quirks.terminal_allow_keyboard_input = false;
 }

config.h

@@ -90,6 +90,8 @@ typedef struct {
  * (Normally unneeded) quirky options
  */
 typedef struct {
+    /* If true and using the framebuffer backend, force a refresh on every draw operation */
+    bool fbdev_force_refresh;
     /* If true, do *not* switch terminal into graphics mode (will show terminal command prompt) */
     bool terminal_prevent_graphics_mode;
     /* If true, do *not* turn off terminal keyboard input (will show entered characters) */

doc/unl0kr.conf.5.scd

@@ -79,12 +79,17 @@ will be merged in the following order:
 	Default: true.
 
 ## Quirks
+*fbdev_force_refresh* = <true|false>
+	If true and using the framebuffer backend, this triggers a display refresh
+	after every draw operation. This has a negative performance impact.
+	Default: false.
+
 *terminal_prevent_graphics_mode* = <true|false>
-	If true this avoids setting the terminal into graphics mode. Will show 
+	If true, this avoids setting the terminal into graphics mode. This will
-	terminal command prompt. Default: false.
+	show the terminal command prompt. Default: false.
 
 *terminal_allow_keyboard_input* = <true|false>
-	If true this avoids turning off terminal keyboard input. This will show 
+	If true, this avoids turning off terminal keyboard input. This will show
 	your password on the terminal. Default: false.
 
 # SEE ALSO
@@ -93,3 +98,4 @@ will be merged in the following order:
 # AUTHORS
 
 *Undef* <debian@undef.tools>
+*Johannes Marbach* <n0-0ne@mailbox.org>

main.c

@@ -381,6 +381,9 @@ int main(int argc, char *argv[]) {
 #if USE_FBDEV
     case UL_BACKENDS_BACKEND_FBDEV:
         fbdev_init();
+        if (conf_opts.quirks.fbdev_force_refresh) {
+            fbdev_force_refresh(true);
+        }
         fbdev_get_sizes(&hor_res, &ver_res, &dpi);
         disp_drv.flush_cb = fbdev_flush;
         break;

unl0kr.conf

@@ -22,5 +22,6 @@ alternate=breezy-dark
 #touchscreen=false
 
 #[quirks]
+#fbdev_force_refresh=true
 #terminal_prevent_graphics_mode=true
 #terminal_allow_keyboard_input=true