CAM: implement basic camera functions with a blank camera

src/core/frontend/camera/blank_camera.cpp

@@ -0,0 +1,31 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/frontend/camera/blank_camera.h"
+
+namespace Camera {
+
+void BlankCamera::StartCapture() {}
+
+void BlankCamera::StopCapture() {}
+
+void BlankCamera::SetFormat(Service::CAM::OutputFormat output_format) {
+    output_rgb = output_format == Service::CAM::OutputFormat::RGB565;
+}
+
+void BlankCamera::SetResolution(const Service::CAM::Resolution& resolution) {
+    width = resolution.width;
+    height = resolution.height;
+};
+
+void BlankCamera::SetFlip(Service::CAM::Flip) {}
+
+void BlankCamera::SetEffect(Service::CAM::Effect) {}
+
+std::vector<u16> BlankCamera::ReceiveFrame() const {
+    // Note: 0x80008000 stands for two black pixels in YUV422
+    return std::vector<u16>(width * height, output_rgb ? 0 : 0x8000);
+}
+
+} // namespace Camera