Add support for owner screenshot HTTP GET API

common/network/GetAPI.h

@@ -0,0 +1,54 @@
+/* Copyright (C) 2021 Kasm
+ *
+ * This 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 software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __NETWORK_GET_API_H__
+#define __NETWORK_GET_API_H__
+
+#include <pthread.h>
+#include <rfb/PixelBuffer.h>
+#include <rfb/PixelFormat.h>
+#include <stdint.h>
+#include <vector>
+
+namespace network {
+
+  class GetAPIMessager {
+  public:
+    GetAPIMessager();
+
+    // from main thread
+    void mainUpdateScreen(rfb::PixelBuffer *pb);
+
+    // from network threads
+    uint8_t *netGetScreenshot(uint16_t w, uint16_t h,
+                              const uint8_t q, const bool dedup,
+                              uint32_t &len, uint8_t *staging);
+  private:
+    pthread_mutex_t screenMutex;
+    rfb::ManagedPixelBuffer screenPb;
+    uint16_t screenW, screenH;
+    uint64_t screenHash;
+
+    std::vector<uint8_t> cachedJpeg;
+    uint16_t cachedW, cachedH;
+    uint8_t cachedQ;
+  };
+
+}
+
+#endif // __NETWORK_GET_API_H__