[client] imgui: converted alerts to use imgui

client/CMakeLists.txt

@@ -123,6 +123,7 @@ set(SOURCES
 	src/overlay_utils.c
 	src/overlay_utils.cpp
 
+	src/overlay/alert.c
 	src/overlay/fps.c
 	src/overlay/graphs.c
 	src/overlay/help.c

client/src/app.c

@@ -39,6 +39,8 @@
 #include <math.h>
 #include <string.h>
 
+#define ALERT_TIMEOUT 2000000
+
 bool app_isRunning(void)
 {
   return
@@ -511,14 +513,11 @@ void app_alert(LG_MsgAlert type, const char * fmt, ...)
   valloc_sprintf(&buffer, fmt, args);
   va_end(args);
 
-  g_state.lgr->on_alert(
-    g_state.lgrData,
-    type,
-    buffer,
-    NULL
-  );
-
-  free(buffer);
+  free(g_state.alertMessage);
+  g_state.alertMessage = buffer;
+  g_state.alertTimeout = microtime() + ALERT_TIMEOUT;
+  g_state.alertType    = type;
+  g_state.alertShow    = true;
 }
 
 KeybindHandle app_registerKeybind(int sc, KeybindFn callback, void * opaque, const char * description)

client/src/main.c

@@ -192,6 +192,8 @@ static int renderThread(void * unused)
       ImFontAtlas_Clear(g_state.io->Fonts);
       ImFontAtlas_AddFontFromFileTTF(g_state.io->Fonts, g_state.fontName,
         g_params.uiSize * g_state.windowScale, NULL, NULL);
+      g_state.fontLarge = ImFontAtlas_AddFontFromFileTTF(g_state.io->Fonts,
+        g_state.fontName, 2 * g_params.uiSize * g_state.windowScale, NULL, NULL);
       ImFontAtlas_Build(g_state.io->Fonts);
 
       if (g_state.lgr)
@@ -774,6 +776,7 @@ static int lg_run(void)
   DEBUG_INFO("Using font: %s", g_state.fontName);
 
   g_state.overlays = ll_new();
+  app_registerOverlay(&LGOverlayAlert , NULL);
   app_registerOverlay(&LGOverlayFPS   , NULL);
   app_registerOverlay(&LGOverlayGraphs, NULL);
   app_registerOverlay(&LGOverlayHelp  , NULL);

client/src/main.h

@@ -51,6 +51,12 @@ struct AppState
   ImGuiStyle * style;
   struct ll  * overlays;
   char       * fontName;
+  ImFont     * fontLarge;
+
+  bool        alertShow;
+  char      * alertMessage;
+  LG_MsgAlert alertType;
+  uint64_t    alertTimeout;
 
   struct LG_DisplayServerOps * ds;
   bool                         dsInitialized;

client/src/overlay/alert.c

@@ -0,0 +1,89 @@
+/**
+ * Looking Glass
+ * Copyright (C) 2017-2021 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 "../main.h"
+
+static bool alert_init(void ** udata, void * params)
+{
+  return true;
+}
+
+static void alert_free(void * udata)
+{
+}
+
+static const uint32_t colours[] =
+{
+  0xCC0000, // LG_ALERT_INFO
+  0x00CC00, // LG_ALERT_SUCCESS
+  0x007FCC, // LG_ALERT_WARNING
+  0x0000FF  // LG_ALERT_ERROR
+};
+
+static int alert_render(void * udata, bool interactive, struct Rect * windowRects,
+    int maxRects)
+{
+  if (!g_state.alertShow)
+    return 0;
+
+  if (g_state.alertTimeout < microtime())
+  {
+    g_state.alertShow = false;
+    free(g_state.alertMessage);
+    g_state.alertMessage = NULL;
+    return 0;
+  }
+
+  ImVec2 * screen = overlayGetScreenSize();
+  igSetNextWindowBgAlpha(0.8f);
+  igSetNextWindowPos((ImVec2) { screen->x / 2.0f, screen->y / 2.0f }, 0,
+    (ImVec2) { 0.5f, 0.5f });
+  igPushStyleColorU32(ImGuiCol_WindowBg, colours[g_state.alertType]);
+
+  igBegin(
+    "Alert",
+    NULL,
+    ImGuiWindowFlags_NoDecoration    | ImGuiWindowFlags_AlwaysAutoResize   |
+    ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoFocusOnAppearing |
+    ImGuiWindowFlags_NoNav           | ImGuiWindowFlags_NoTitleBar
+  );
+
+  igPushFont(g_state.fontLarge);
+  igText("%s", g_state.alertMessage);
+  igPopFont();
+
+  overlayGetImGuiRect(windowRects);
+  igEnd();
+  igPopStyleColor(1);
+
+  return 1;
+}
+
+struct LG_OverlayOps LGOverlayAlert =
+{
+  .name           = "alert",
+  .init           = alert_init,
+  .free           = alert_free,
+  .render         = alert_render
+};

client/src/overlay/help.c

@@ -54,7 +54,6 @@ static int help_render(void * udata, bool interactive, struct Rect * windowRects
     ImGuiWindowFlags_NoNav           | ImGuiWindowFlags_NoTitleBar
   );
 
-
   if (igBeginTable("Help", 2, 0, (ImVec2) { 0.0f, 0.0f }, 0.0f))
   {
     const char * escapeName = xfree86_to_display[g_params.escapeKey];

client/src/overlays.h

@@ -23,6 +23,7 @@
 
 #include "interface/overlay.h"
 
+extern struct LG_OverlayOps LGOverlayAlert;
 extern struct LG_OverlayOps LGOverlayFPS;
 extern struct LG_OverlayOps LGOverlayGraphs;
 extern struct LG_OverlayOps LGOverlayHelp;