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https://github.com/RGBCube/serenity
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Import all this stuff into a single repo called Serenity.
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71
AK/Bitmap.h
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71
AK/Bitmap.h
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#pragma once
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#include "StdLib.h"
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#include "Types.h"
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#include "kmalloc.h"
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namespace AK {
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class Bitmap {
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public:
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// NOTE: A wrapping Bitmap won't try to free the wrapped data.
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static Bitmap wrap(byte* data, unsigned size)
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{
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return Bitmap(data, size);
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}
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static Bitmap create(unsigned size)
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{
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return Bitmap(size);
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}
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~Bitmap()
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{
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if (m_owned)
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kfree(m_data);
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m_data = nullptr;
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}
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unsigned size() const { return m_size; }
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bool get(unsigned index) const
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{
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ASSERT(index < m_size);
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return 0 != (m_data[index / 8] & (1u << (index % 8)));
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}
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void set(unsigned index, bool value) const
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{
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ASSERT(index < m_size);
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if (value)
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m_data[index / 8] |= static_cast<byte>((1u << (index % 8)));
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else
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m_data[index / 8] &= static_cast<byte>(~(1u << (index % 8)));
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}
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byte* data() { return m_data; }
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const byte* data() const { return m_data; }
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private:
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explicit Bitmap(unsigned size)
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: m_size(size)
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, m_owned(true)
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{
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ASSERT(m_size != 0);
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m_data = reinterpret_cast<byte*>(kmalloc(ceilDiv(size, 8u)));
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}
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Bitmap(byte* data, unsigned size)
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: m_data(data)
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, m_size(size)
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, m_owned(false)
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{
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}
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byte* m_data { nullptr };
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unsigned m_size { 0 };
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bool m_owned { false };
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};
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}
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using AK::Bitmap;
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