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a258d6507a
Font now uses the same in-memory format as the font files we have on disk. This allows us to simply mmap() the font files and not use any additional memory for them. Very cool! :^) Hacking on this exposed a bug in file-backed VMObjects where the first client to instantiate a VMObject for a specific inode also got to decide its size. Since file-backed VMObjects always have the same size as the underlying file, this made no sense, so I removed the ability to even set a size in that case.
78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
#pragma once
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#include "CharacterBitmap.h"
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#include <AK/Retainable.h>
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#include <AK/RetainPtr.h>
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#include <AK/AKString.h>
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#include <AK/Types.h>
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// FIXME: Make a MutableGlyphBitmap buddy class for FontEditor instead?
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class GlyphBitmap {
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friend class Font;
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public:
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const unsigned* rows() const { return m_rows; }
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unsigned row(unsigned index) const { return m_rows[index]; }
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bool bit_at(int x, int y) const { return row(y) & (1 << x); }
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void set_bit_at(int x, int y, bool b)
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{
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auto& mutable_row = const_cast<unsigned*>(m_rows)[y];
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if (b)
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mutable_row |= 1 << x;
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else
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mutable_row &= ~(1 << x);
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}
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Size size() const { return m_size; }
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int width() const { return m_size.width(); }
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int height() const { return m_size.height(); }
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private:
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GlyphBitmap(const unsigned* rows, Size size)
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: m_rows(rows)
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, m_size(size)
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{
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}
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const unsigned* m_rows { nullptr };
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Size m_size;
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};
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class Font : public Retainable<Font> {
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public:
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static Font& default_font();
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static Font& default_bold_font();
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RetainPtr<Font> clone() const;
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static RetainPtr<Font> load_from_memory(const byte*);
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#ifdef USERLAND
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static RetainPtr<Font> load_from_file(const String& path);
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bool write_to_file(const String& path);
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#endif
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~Font();
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GlyphBitmap glyph_bitmap(char ch) const { return GlyphBitmap(&m_rows[(byte)ch * m_glyph_height], { m_glyph_width, m_glyph_height }); }
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byte glyph_width() const { return m_glyph_width; }
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byte glyph_height() const { return m_glyph_height; }
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String name() const { return m_name; }
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void set_name(const String& name) { m_name = name; }
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static void initialize();
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private:
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Font(const String& name, unsigned* rows, byte glyph_width, byte glyph_height);
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String m_name;
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unsigned* m_rows { nullptr };
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RetainPtr<CharacterBitmap> m_error_bitmap;
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byte m_glyph_width { 0 };
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byte m_glyph_height { 0 };
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};
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