GraphicsBitmap.h

#pragma once

#include "Color.h"
#include "Rect.h"
#include "Size.h"
#include <AK/Retainable.h>
#include <AK/RetainPtr.h>
#include <AK/AKString.h>
#include <AK/MappedFile.h>
#include <SharedBuffer.h>

class GraphicsBitmap : public Retainable<GraphicsBitmap> {
public:
    enum class Format { Invalid, RGB32, RGBA32, Indexed8 };

    static Retained<GraphicsBitmap> create(Format, const Size&);
    static Retained<GraphicsBitmap> create_wrapper(Format, const Size&, RGBA32*);
    static RetainPtr<GraphicsBitmap> load_from_file(const String& path);
    static RetainPtr<GraphicsBitmap> load_from_file(Format, const String& path, const Size&);
    static Retained<GraphicsBitmap> create_with_shared_buffer(Format, Retained<SharedBuffer>&&, const Size&);
    ~GraphicsBitmap();

    RGBA32* scanline(int y);
    const RGBA32* scanline(int y) const;

    byte* bits(int y);
    const byte* bits(int y) const;

    Rect rect() const { return { {}, m_size }; }
    Size size() const { return m_size; }
    int width() const { return m_size.width(); }
    int height() const { return m_size.height(); }
    size_t pitch() const { return m_pitch; }
    int shared_buffer_id() const { return m_shared_buffer ? m_shared_buffer->shared_buffer_id() : -1; }

    bool has_alpha_channel() const { return m_format == Format::RGBA32; }
    Format format() const { return m_format; }

    void set_mmap_name(const String&);

    size_t size_in_bytes() const { return m_pitch * m_size.height(); }

    Color palette_color(byte index) const { return Color::from_rgba(m_palette[index]); }
    void set_palette_color(byte index, Color color) { m_palette[index] = color.value(); }

    Color get_pixel(int x, int y) const
    {
        switch (m_format) {
        case Format::RGB32:
            return Color::from_rgb(scanline(y)[x]);
        case Format::RGBA32:
            return Color::from_rgba(scanline(y)[x]);
        case Format::Indexed8:
            return Color::from_rgba(m_palette[bits(y)[x]]);
        default:
            ASSERT_NOT_REACHED();
        }
    }

private:
    GraphicsBitmap(Format, const Size&);
    GraphicsBitmap(Format, const Size&, RGBA32*);
    GraphicsBitmap(Format, const Size&, MappedFile&&);
    GraphicsBitmap(Format, Retained<SharedBuffer>&&, const Size&);

    Size m_size;
    RGBA32* m_data { nullptr };
    RGBA32* m_palette { nullptr };
    size_t m_pitch { 0 };
    Format m_format { Format::Invalid };
    bool m_needs_munmap { false };
    MappedFile m_mapped_file;
    RetainPtr<SharedBuffer> m_shared_buffer;
};

inline RGBA32* GraphicsBitmap::scanline(int y)
{
    return reinterpret_cast<RGBA32*>((((byte*)m_data) + (y * m_pitch)));
}

inline const RGBA32* GraphicsBitmap::scanline(int y) const
{
    return reinterpret_cast<const RGBA32*>((((const byte*)m_data) + (y * m_pitch)));
}

inline const byte* GraphicsBitmap::bits(int y) const
{
    return reinterpret_cast<const byte*>(scanline(y));
}

inline byte* GraphicsBitmap::bits(int y)
{
    return reinterpret_cast<byte*>(scanline(y));
}