wayland/screencopy: reset buffer requests between frames

Prevents buffer requests from collecting a huge set of duplicate
dmabuf and shm formats.

src/wayland/buffer/manager.cpp

@@ -22,6 +22,8 @@ namespace {
 QS_LOGGING_CATEGORY(logBuffer, "quickshell.wayland.buffer", QtWarningMsg);
 }
 
+void WlBufferRequest::reset() { *this = WlBufferRequest(); }
+
 WlBuffer* WlBufferSwapchain::createBackbuffer(const WlBufferRequest& request, bool* newBuffer) {
 	auto& buffer = this->presentSecondBuffer ? this->buffer1 : this->buffer2;
 
@@ -53,7 +55,8 @@ bool WlBufferManager::isReady() const { return this->p->mReady; }
 	                             << " (disabled: " << dmabufDisabled << ')';
 
 	for (const auto& [format, modifiers]: request.dmabuf.formats) {
-		qCDebug(logBuffer) << "    Format" << dmabuf::FourCCStr(format);
+		qCDebug(logBuffer).nospace() << "    Format " << dmabuf::FourCCStr(format)
+		                             << (modifiers.length() == 0 ? " (No modifiers specified)" : "");
 
 		for (const auto& modifier: modifiers) {
 			qCDebug(logBuffer) << "      Explicit Modifier" << dmabuf::FourCCModStr(modifier);

src/wayland/buffer/manager.hpp

@@ -68,6 +68,8 @@ struct WlBufferRequest {
 		dev_t device = 0;
 		StackList<DmaFormat, 1> formats;
 	} dmabuf;
+
+	void reset();
 };
 
 class WlBuffer {

src/wayland/screencopy/hyprland_screencopy/hyprland_screencopy.cpp

@@ -64,6 +64,8 @@ void HyprlandScreencopyContext::onToplevelDestroyed() {
 void HyprlandScreencopyContext::captureFrame() {
 	if (this->object()) return;
 
+	this->request.reset();
+
 	this->init(this->manager->capture_toplevel_with_wlr_toplevel_handle(
 	    this->paintCursors ? 1 : 0,
 	    this->handle->object()

src/wayland/screencopy/wlr_screencopy/wlr_screencopy.cpp

@@ -65,6 +65,8 @@ void WlrScreencopyContext::onScreenDestroyed() {
 void WlrScreencopyContext::captureFrame() {
 	if (this->object()) return;
 
+	this->request.reset();
+
 	if (this->region.isEmpty()) {
 		this->init(manager->capture_output(this->paintCursors ? 1 : 0, screen->output()));
 	} else {