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LibGfx: Avoid unaligned loads and stores in GlyphBitmap

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Ali Mohammad Pur 2021-11-22 09:16:03 +03:30 • committed by Brian Gianforcaro
parent 71298ad9ba
commit 3ca00c8ae6
3 changed files with 24 additions and 23 deletions
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27
Userland/Libraries/LibGfx/Font.h
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@ -6,6 +6,8 @@
#pragma once
#include <AK/Bitmap.h>
#include <AK/ByteReader.h>
#include <AK/MappedFile.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
@ -20,31 +22,30 @@ namespace Gfx {
class GlyphBitmap {
public:
GlyphBitmap() = default;
GlyphBitmap(const unsigned* rows, IntSize size)
GlyphBitmap(const u8* rows, size_t start_index, IntSize size)
: m_rows(rows)
, m_start_index(start_index)
, m_size(size)
{
}
const unsigned* rows() const { return m_rows; }
unsigned row(unsigned index) const { return m_rows[index]; }
unsigned row(unsigned index) const { return ByteReader::load32(bitmap(index).data()); }
bool bit_at(int x, int y) const { return row(y) & (1 << x); }
void set_bit_at(int x, int y, bool b)
{
auto& mutable_row = const_cast<unsigned*>(m_rows)[y];
if (b)
mutable_row |= 1 << x;
else
mutable_row &= ~(1 << x);
}
bool bit_at(int x, int y) const { return bitmap(y).get(x); }
void set_bit_at(int x, int y, bool b) { bitmap(y).set(x, b); }
IntSize size() const { return m_size; }
int width() const { return m_size.width(); }
int height() const { return m_size.height(); }
private:
const unsigned* m_rows { nullptr };
AK::Bitmap bitmap(size_t y) const
{
return { const_cast<u8*>(m_rows) + sizeof(u32) * (m_start_index + y), sizeof(u32) * 8 };
}
const u8* m_rows { nullptr };
size_t m_start_index { 0 };
IntSize m_size { 0, 0 };
};