[client] overlay: add record indicator

client/CMakeLists.txt

@@ -141,6 +141,7 @@ set(SOURCES
 	src/overlay/help.c
 	src/overlay/config.c
 	src/overlay/msg.c
+	src/overlay/record.c
 )
 
 # Force cimgui to build as a static library.

client/include/app.h

@@ -150,6 +150,8 @@ void app_msgBoxClose(MsgBoxHandle handle);
 typedef struct KeybindHandle * KeybindHandle;
 typedef void (*KeybindFn)(int sc, void * opaque);
 
+void app_showRecord(bool show);
+
 /**
  * Register a handler for the <super>+<key> combination
  * @param sc       The scancode to register

client/src/app.c

@@ -673,6 +673,11 @@ void app_msgBoxClose(MsgBoxHandle handle)
   overlayMsg_close(handle);
 }
 
+void app_showRecord(bool show)
+{
+  overlayRecord_show(show);
+}
+
 KeybindHandle app_registerKeybind(int sc, KeybindFn callback, void * opaque, const char * description)
 {
   // don't allow duplicate binds

client/src/main.c

@@ -1647,6 +1647,7 @@ int main(int argc, char * argv[])
   app_registerOverlay(&LGOverlayGraphs, NULL);
   app_registerOverlay(&LGOverlayHelp  , NULL);
   app_registerOverlay(&LGOverlayMsg   , NULL);
+  app_registerOverlay(&LGOverlayRecord, NULL);
 
 
   // early renderer setup for option registration

client/src/overlay/record.c

@@ -0,0 +1,86 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2022 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "interface/overlay.h"
+#include "cimgui.h"
+#include "overlay_utils.h"
+
+#include "common/stringutils.h"
+
+#include "../main.h"
+
+static bool recordShow = false;
+static bool recordToggle = false;
+static unsigned long long lastTick = 0;
+
+static bool record_init(void ** udata, const void * params)
+{
+  return true;
+}
+
+static void record_free(void * udata)
+{}
+
+static int record_render(void * udata, bool interactive, struct Rect * windowRects,
+    int maxRects)
+{
+  if (!recordShow || !recordToggle)
+    return 0;
+
+  ImVec2 * screen = overlayGetScreenSize();
+  ImDrawList_AddCircleFilled(igGetBackgroundDrawList_Nil(),
+    (ImVec2) { screen->x - 20.0f, 20.0f },
+    5.0f, 0xFF0000FF, 0
+  );
+
+  *windowRects = (struct Rect) {
+    .x = screen->x - 26, .y = 14, .w = 12, .h = 12
+  };
+  return 1;
+}
+
+static bool record_tick(void * udata, unsigned long long tickCount)
+{
+  if (tickCount - lastTick >= 25)
+  {
+    recordToggle = !recordToggle;
+    lastTick = tickCount;
+    return true;
+  }
+  return false;
+}
+
+struct LG_OverlayOps LGOverlayRecord =
+{
+  .name           = "record",
+  .init           = record_init,
+  .free           = record_free,
+  .render         = record_render,
+  .tick           = record_tick,
+};
+
+void overlayRecord_show(bool show)
+{
+  if (show == recordShow)
+    return;
+
+  recordShow = show;
+  app_invalidateOverlay(true);
+}

client/src/overlays.h

@@ -39,6 +39,7 @@ extern struct LG_OverlayOps LGOverlayGraphs;
 extern struct LG_OverlayOps LGOverlayHelp;
 extern struct LG_OverlayOps LGOverlayConfig;
 extern struct LG_OverlayOps LGOverlayMsg;
+extern struct LG_OverlayOps LGOverlayRecord;
 
 void overlayAlert_show(LG_MsgAlert type, const char * fmt, va_list args);
 
@@ -55,4 +56,6 @@ void overlayConfig_register(const char * title,
 void overlayConfig_registerTab(const char * title,
     void (*callback)(void * udata, int * id), void * udata);
 
+void overlayRecord_show(bool show);
+
 #endif