Add DVT screenshot bindings

cpp/include/idevice++/dvt/screenshot.hpp

@@ -0,0 +1,49 @@
+// Jackson Coxson
+
+#pragma once
+#include <cstring>
+#include <idevice++/bindings.hpp>
+#include <idevice++/dvt/remote_server.hpp>
+#include <idevice++/result.hpp>
+#include <memory>
+#include <vector>
+
+namespace IdeviceFFI {
+
+using ScreenshotClientPtr =
+    std::unique_ptr<ScreenshotClientHandle,
+                    FnDeleter<ScreenshotClientHandle, screenshot_client_free>>;
+
+/// C++ wrapper around the ScreenshotClient FFI handle
+///
+/// Provides a high-level interface for capturing screenshots
+/// from a connected iOS device through the DVT service.
+class ScreenshotClient {
+  public:
+    /// Creates a new ScreenshotClient using an existing RemoteServer.
+    ///
+    /// The RemoteServer is borrowed, not consumed.
+    static Result<ScreenshotClient, FfiError> create(RemoteServer& server);
+
+    /// Captures a screenshot and returns it as a PNG buffer.
+    ///
+    /// On success, returns a vector containing PNG-encoded bytes.
+    Result<std::vector<uint8_t>, FfiError>    capture();
+
+    ~ScreenshotClient() noexcept                               = default;
+    ScreenshotClient(ScreenshotClient&&) noexcept              = default;
+    ScreenshotClient& operator=(ScreenshotClient&&) noexcept   = default;
+    ScreenshotClient(const ScreenshotClient&)                  = delete;
+    ScreenshotClient&       operator=(const ScreenshotClient&) = delete;
+
+    ScreenshotClientHandle* raw() const noexcept { return handle_.get(); }
+    static ScreenshotClient adopt(ScreenshotClientHandle* h) noexcept {
+        return ScreenshotClient(h);
+    }
+
+  private:
+    explicit ScreenshotClient(ScreenshotClientHandle* h) noexcept : handle_(h) {}
+    ScreenshotClientPtr handle_{};
+};
+
+} // namespace IdeviceFFI