Kernel: Add VirtIOGPU graphics device

Kernel/Graphics/VirtIOGPU/VirtIOGPUConsole.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <Kernel/Graphics/Console/GenericFramebufferConsole.h>
+#include <Kernel/Graphics/VirtIOGPU/VirtIOGPU.h>
+#include <Kernel/TimerQueue.h>
+
+namespace Kernel::Graphics {
+
+class DirtyRect {
+public:
+    void union_rect(size_t x, size_t y, size_t width, size_t height);
+    bool is_dirty() const { return m_is_dirty; }
+    size_t x() const { return m_x0; }
+    size_t y() const { return m_y0; }
+    size_t width() const { return m_x1 - m_x0; }
+    size_t height() const { return m_y1 - m_y0; }
+    void clear() { m_is_dirty = false; }
+
+private:
+    bool m_is_dirty { false };
+    size_t m_x0 { 0 };
+    size_t m_y0 { 0 };
+    size_t m_x1 { 0 };
+    size_t m_y1 { 0 };
+};
+
+class VirtIOGPUConsole final : public GenericFramebufferConsole {
+public:
+    static NonnullRefPtr<VirtIOGPUConsole> initialize(RefPtr<VirtIOGPU>);
+
+    virtual void set_resolution(size_t width, size_t height, size_t pitch) override;
+    virtual void flush(size_t x, size_t y, size_t width, size_t height) override;
+    virtual void enable() override;
+
+private:
+    void enqueue_refresh_timer();
+    virtual u8* framebuffer_data() override
+    {
+        return m_framebuffer_region.unsafe_ptr()->vaddr().as_ptr();
+    }
+
+    VirtIOGPUConsole(RefPtr<VirtIOGPU>);
+    WeakPtr<Region> m_framebuffer_region;
+    RefPtr<VirtIOGPU> m_gpu;
+    DirtyRect m_dirty_rect;
+};
+
+}