ladybird/Kernel/Graphics/Console/GenericFramebufferConsole.h

/*
 * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/RefCounted.h>
#include <AK/Types.h>
#include <Kernel/Graphics/Console/Console.h>
#include <Kernel/PhysicalAddress.h>

namespace Kernel::Graphics {

class GenericFramebufferConsoleImpl : public Console {
public:
    virtual size_t bytes_per_base_glyph() const override;
    virtual size_t chars_per_line() const override;

    virtual size_t max_column() const override { return m_width / (m_glyph_columns + m_glyph_spacing); }
    virtual size_t max_row() const override { return m_height / m_glyph_rows; }

    virtual bool is_hardware_paged_capable() const override { return false; }
    virtual bool has_hardware_cursor() const override { return false; }

    virtual void set_cursor(size_t x, size_t y) override;
    virtual void hide_cursor() override;
    virtual void show_cursor() override;

    virtual void clear(size_t x, size_t y, size_t length) override;
    virtual void write(size_t x, size_t y, char ch, Color background, Color foreground, bool critical = false) override;
    virtual void write(size_t x, size_t y, char ch, bool critical = false) override;
    virtual void write(char ch, bool critical = false) override;

    virtual void enable() override;
    virtual void disable() override;

    virtual void set_resolution(size_t width, size_t height, size_t pitch) = 0;

protected:
    GenericFramebufferConsoleImpl(size_t width, size_t height, size_t pitch)
        : Console(width, height)
        , m_pitch(pitch)
    {
        m_cursor_overriden_pixels.fill(0);
    }
    virtual u8* framebuffer_data() = 0;
    size_t framebuffer_pitch() const { return m_pitch; }
    virtual void clear_glyph(size_t x, size_t y);

    union FramebufferOffset {
        u8* bytes;
        u32* pixels;
    };
    FramebufferOffset framebuffer_offset(size_t x, size_t y);
    void flush_glyph(size_t x, size_t y);

    size_t const m_glyph_spacing { 1 };
    size_t const m_glyph_columns { 8 };
    size_t const m_glyph_rows { 16 };

    Array<u32, 8> m_cursor_overriden_pixels;

    size_t m_pitch;
};

class GenericFramebufferConsole : public GenericFramebufferConsoleImpl {
public:
    virtual void clear(size_t x, size_t y, size_t length) override;
    virtual void write(size_t x, size_t y, char ch, Color background, Color foreground, bool critical = false) override;

    virtual void enable() override;
    virtual void disable() override;

protected:
    GenericFramebufferConsole(size_t width, size_t height, size_t pitch)
        : GenericFramebufferConsoleImpl(width, height, pitch)
    {
    }

    virtual void clear_glyph(size_t x, size_t y) override;

    mutable Spinlock m_lock { LockRank::None };
};

}