[feat] add Windows DXGI/GDI screen capture with WGC→DXGI→GDI fallback support

src/screen_capturer/windows/screen_capturer_win.cpp

@@ -0,0 +1,91 @@
+#include "screen_capturer_win.h"
+
+#include <memory>
+
+#include "rd_log.h"
+#include "screen_capturer_dxgi.h"
+#include "screen_capturer_gdi.h"
+#include "screen_capturer_wgc.h"
+
+namespace crossdesk {
+
+ScreenCapturerWin::ScreenCapturerWin() {}
+ScreenCapturerWin::~ScreenCapturerWin() { Destroy(); }
+
+int ScreenCapturerWin::Init(const int fps, cb_desktop_data cb) {
+  fps_ = fps;
+  cb_ = cb;
+
+  int ret = -1;
+
+  impl_ = std::make_unique<ScreenCapturerWgc>();
+  ret = impl_->Init(fps_, cb_);
+  if (ret == 0) {
+    LOG_INFO("Windows capturer: using WGC");
+    return 0;
+  }
+
+  LOG_WARN("Windows capturer: WGC init failed (ret={}), try DXGI", ret);
+  impl_.reset();
+
+  impl_ = std::make_unique<ScreenCapturerDxgi>();
+  ret = impl_->Init(fps_, cb_);
+  if (ret == 0) {
+    LOG_INFO("Windows capturer: using DXGI Desktop Duplication");
+    return 0;
+  }
+
+  LOG_WARN("Windows capturer: DXGI init failed (ret={}), fallback to GDI", ret);
+  impl_.reset();
+
+  impl_ = std::make_unique<ScreenCapturerGdi>();
+  ret = impl_->Init(fps_, cb_);
+  if (ret == 0) {
+    LOG_INFO("Windows capturer: using GDI BitBlt");
+    return 0;
+  }
+
+  LOG_ERROR("Windows capturer: all implementations failed, ret={}", ret);
+  impl_.reset();
+  return -1;
+}
+
+int ScreenCapturerWin::Destroy() {
+  if (impl_) {
+    impl_->Destroy();
+    impl_.reset();
+  }
+  return 0;
+}
+
+int ScreenCapturerWin::Start(bool show_cursor) {
+  if (!impl_) return -1;
+  return impl_->Start(show_cursor);
+}
+
+int ScreenCapturerWin::Stop() {
+  if (!impl_) return 0;
+  return impl_->Stop();
+}
+
+int ScreenCapturerWin::Pause(int monitor_index) {
+  if (!impl_) return -1;
+  return impl_->Pause(monitor_index);
+}
+
+int ScreenCapturerWin::Resume(int monitor_index) {
+  if (!impl_) return -1;
+  return impl_->Resume(monitor_index);
+}
+
+int ScreenCapturerWin::SwitchTo(int monitor_index) {
+  if (!impl_) return -1;
+  return impl_->SwitchTo(monitor_index);
+}
+
+std::vector<DisplayInfo> ScreenCapturerWin::GetDisplayInfoList() {
+  if (!impl_) return {};
+  return impl_->GetDisplayInfoList();
+}
+
+}  // namespace crossdesk