linux-wallpaperengine-kde/src/WallpaperEngine/WebBrowser/CEF/SharedMemoryRenderHandler.h

#pragma once

#include "WallpaperEngine/WebBrowser/IPC/WebHostSharedMemory.h"
#include "include/cef_browser.h"
#include "include/cef_render_handler.h"

namespace WallpaperEngine::WebBrowser::CEF {
// Used only inside the disposable web-host child process (see WallpaperApplication::runWebHost()).
// Has no GL context and no CWeb to talk to directly - it writes CEF's off-screen-rendered pixels
// straight into the shared memory segment the main process reads frames from. GetViewRect reports
// whatever size the main process last asked for via shm - the caller (runWebHost()) is responsible
// for calling CefBrowserHost::WasResized() when that changes.
class SharedMemoryRenderHandler : public CefRenderHandler {
public:
    explicit SharedMemoryRenderHandler (WallpaperEngine::WebBrowser::IPC::WebHostSharedMemory* shm);

    ~SharedMemoryRenderHandler () override = default;

    void GetViewRect (CefRefPtr<CefBrowser> browser, CefRect& rect) override;

    void OnPaint (
	CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList& dirtyRects, const void* buffer,
	int width, int height
    ) override;

    IMPLEMENT_REFCOUNTING (SharedMemoryRenderHandler);

private:
    WallpaperEngine::WebBrowser::IPC::WebHostSharedMemory* m_shm;
};
} // namespace WallpaperEngine::WebBrowser::CEF