wayland/screencopy: handle buffer creation failures

src/wayland/buffer/manager.cpp

@@ -69,6 +69,11 @@ bool WlBufferManager::isReady() const { return this->p->mReady; }
 		qCDebug(logBuffer) << "    Format" << format;
 	}
 
+	if (request.width == 0 || request.height == 0) {
+		qCWarning(logBuffer) << "Cannot create zero-sized buffer.";
+		return nullptr;
+	}
+
 	if (!dmabufDisabled) {
 		if (auto* buf = this->p->dmabuf.createDmabuf(request)) return buf;
 		qCWarning(logBuffer) << "DMA buffer creation failed, falling back to SHM.";

src/wayland/screencopy/hyprland_screencopy/hyprland_screencopy.cpp

@@ -103,6 +103,16 @@ void HyprlandScreencopyContext::hyprland_toplevel_export_frame_v1_flags(uint32_t
 
 void HyprlandScreencopyContext::hyprland_toplevel_export_frame_v1_buffer_done() {
 	auto* backbuffer = this->mSwapchain.createBackbuffer(this->request);
+
+	if (!backbuffer || !backbuffer->buffer()) {
+		qCWarning(logScreencopy) << "Backbuffer creation failed for screencopy. Skipping frame.";
+
+		// Try again. This will be spammy if the compositor continuously sends bad frames.
+		this->destroy();
+		this->captureFrame();
+		return;
+	}
+
 	this->copy(backbuffer->buffer(), this->copiedFirstFrame ? 0 : 1);
 }
 

src/wayland/screencopy/image_copy_capture/image_copy_capture.cpp

@@ -117,6 +117,12 @@ void IccScreencopyContext::doCapture() {
 	auto newBuffer = false;
 	auto* backbuffer = this->mSwapchain.createBackbuffer(this->request, &newBuffer);
 
+	if (!backbuffer || !backbuffer->buffer()) {
+		qCWarning(logIcc) << "Backbuffer creation failed for screencopy. Waiting for updated buffer "
+		                     "creation parameters before trying again.";
+		return;
+	}
+
 	this->IccCaptureFrame::init(this->IccCaptureSession::create_frame());
 	this->IccCaptureFrame::attach_buffer(backbuffer->buffer());
 

src/wayland/screencopy/wlr_screencopy/wlr_screencopy.cpp

@@ -111,6 +111,15 @@ void WlrScreencopyContext::zwlr_screencopy_frame_v1_flags(uint32_t flags) {
 void WlrScreencopyContext::zwlr_screencopy_frame_v1_buffer_done() {
 	auto* backbuffer = this->mSwapchain.createBackbuffer(this->request);
 
+	if (!backbuffer || !backbuffer->buffer()) {
+		qCWarning(logScreencopy) << "Backbuffer creation failed for screencopy. Skipping frame.";
+
+		// Try again. This will be spammy if the compositor continuously sends bad frames.
+		this->destroy();
+		this->captureFrame();
+		return;
+	}
+
 	if (this->copiedFirstFrame) {
 		this->copy_with_damage(backbuffer->buffer());
 	} else {