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/*
* Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Graphics/VirtIOGPU/VirtIOGPU.h>
#include <Kernel/VirtIO/VirtIO.h>
#include <Kernel/VirtIO/VirtIOQueue.h>
namespace Kernel::Graphics {
class VirtIOFrameBufferDevice final : public BlockDevice {
public:
VirtIOFrameBufferDevice(VirtIOGPU& virtio_gpu, VirtIOGPUScanoutID);
virtual ~VirtIOFrameBufferDevice() override;
virtual void deactivate_writes();
virtual void activate_writes();
bool try_to_set_resolution(size_t width, size_t height);
void clear_to_black();
VMObject& vm_object() { return m_framebuffer->vmobject(); }
Region& region() { return *m_framebuffer; }
size_t width() const { return display_info().rect.width; }
size_t height() const { return display_info().rect.height; }
size_t pitch() const { return display_info().rect.width * 4; }
size_t size_in_bytes() const;
static size_t calculate_framebuffer_size(size_t width, size_t height)
{
return sizeof(u32) * width * height;
}
void flush_dirty_window(VirtIOGPURect const&);
void transfer_framebuffer_data_to_host(VirtIOGPURect const&);
void flush_displayed_image(VirtIOGPURect const&);
void draw_ntsc_test_pattern();
private:
virtual const char* class_name() const override { return "VirtIOFrameBuffer"; }
VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne const& display_info() const;
VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne& display_info();
virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
virtual bool can_read(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; };
virtual void start_request(AsyncBlockDeviceRequest& request) override { request.complete(AsyncDeviceRequest::Failure); }
virtual mode_t required_mode() const override { return 0666; }
virtual String device_name() const override { return String::formatted("fb{}", minor()); }
VirtIOGPU& m_gpu;
const VirtIOGPUScanoutID m_scanout;
VirtIOGPUResourceID m_resource_id { 0 };
OwnPtr<Region> m_framebuffer;
RefPtr<VMObject> m_framebuffer_sink_vmobject;
bool m_are_writes_active { true };
// FIXME: This needs to be cleaned up if the WindowServer exits while we are in a tty
WeakPtr<Region> m_userspace_mmap_region;
};
}
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