Own brush workers and thin preview/platform seams

src/platform_linux/linux_platform_services.cpp

@@ -2,21 +2,28 @@
 
 #ifdef __LINUX__
 #include <string>
-
-#include <GLFW/glfw3.h>
-
-#include "app.h"
+#include <utility>
 
 namespace pp::platform::linux {
 namespace {
 
+std::function<void(std::string)> g_fps_title_callback;
+
 void linux_update_fps(int frames)
 {
-    App::I->title("PanoPainter - " + std::to_string(frames) + " FPS");
+    if (!g_fps_title_callback)
+        return;
+
+    g_fps_title_callback("PanoPainter - " + std::to_string(frames) + " FPS");
 }
 
 }
 
+void set_fps_title_callback(std::function<void(std::string)> callback)
+{
+    g_fps_title_callback = std::move(callback);
+}
+
 void report_rendered_frames(int frames)
 {
     linux_update_fps(frames);
@@ -26,6 +33,11 @@ void report_rendered_frames(int frames)
 #else
 namespace pp::platform::linux {
 
+void set_fps_title_callback(std::function<void(std::string)> callback)
+{
+    (void)callback;
+}
+
 void report_rendered_frames(int frames)
 {
     (void)frames;

src/platform_linux/linux_platform_services.h

@@ -1,7 +1,11 @@
 #pragma once
 
+#include <functional>
+#include <string>
+
 namespace pp::platform::linux {
 
+void set_fps_title_callback(std::function<void(std::string)> callback);
 void report_rendered_frames(int frames);
 
 }