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/*
* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "ScreenLayout.h"
#include <AK/Error.h>
#include <AK/Span.h>
#include <sys/ioctl_numbers.h>
namespace WindowServer {
// Handles low-level device interfacing for the screen.
// ScreenBackend is a thin transparent wrapper around framebuffer-related data which is responsible for setting up this data,
// tearing it down, changing its properties like size, and performing flushes.
// The screen is intended to directly access the members to perform its function, but it only ever reads from anything
// except the data in the framebuffer memory.
class ScreenBackend {
public:
virtual ~ScreenBackend() = default;
virtual ErrorOr<void> open() = 0;
virtual void set_head_buffer(int index) = 0;
virtual ErrorOr<void> flush_framebuffer_rects(int buffer_index, Span<FBRect const> rects) = 0;
virtual ErrorOr<void> unmap_framebuffer() = 0;
virtual ErrorOr<void> map_framebuffer() = 0;
virtual ErrorOr<void> set_head_resolution(FBHeadResolution) = 0;
virtual ErrorOr<FBHeadProperties> get_head_properties() = 0;
virtual ErrorOr<void> write_all_contents(Gfx::IntRect const&) { return {}; }
bool m_can_device_flush_buffers { true };
bool m_can_set_head_buffer { false };
Gfx::ARGB32* m_framebuffer { nullptr };
size_t m_size_in_bytes { 0 };
size_t m_back_buffer_offset { 0 };
int m_pitch { 0 };
};
}
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