make avatar loading a bit better

imgmanager.cpp

@@ -0,0 +1,29 @@
+#include "imgmanager.hpp"
+
+Cache &ImageManager::GetCache() {
+    return m_cache;
+}
+
+void ImageManager::LoadFromURL(std::string url, std::function<void(Glib::RefPtr<Gdk::Pixbuf>)> cb) {
+    if (m_pixs.find(url) != m_pixs.end()) {
+        cb(m_pixs.at(url));
+        return;
+    }
+
+    m_cache.GetFileFromURL(url, [this, url, cb](std::string path) {
+        try {
+            auto buf = Gdk::Pixbuf::create_from_file(path);
+            m_pixs[url] = buf;
+            cb(buf);
+        } catch (std::exception &e) {
+            fprintf(stderr, "err loading pixbuf from %s: %s\n", path.c_str(), e.what());
+        }
+    });
+}
+
+Glib::RefPtr<Gdk::Pixbuf> ImageManager::GetFromURLIfCached(std::string url) {
+    if (m_pixs.find(url) != m_pixs.end())
+        return m_pixs.at(url);
+
+    return Glib::RefPtr<Gdk::Pixbuf>(nullptr);
+}