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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGUI/Command.h>
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#include <LibGUI/UndoStack.h>
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#include <LibGfx/BitmapFont.h>
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class UndoGlyph : public RefCounted<UndoGlyph> {
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public:
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explicit UndoGlyph(u32 const code_point, Gfx::BitmapFont const& font)
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: m_code_point(code_point)
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, m_font(font)
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{
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}
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NonnullRefPtr<UndoGlyph> save_state() const
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{
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auto state = adopt_ref(*new UndoGlyph(m_code_point, *m_font));
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auto glyph = font().glyph(m_code_point).glyph_bitmap();
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for (int x = 0; x < font().max_glyph_width(); x++)
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for (int y = 0; y < font().glyph_height(); y++)
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state->m_bits[x][y] = glyph.bit_at(x, y);
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state->m_width = glyph.width();
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return state;
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}
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void restore_state(UndoGlyph const& state) const
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{
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auto bitmap = font().glyph(state.m_code_point).glyph_bitmap();
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for (int x = 0; x < font().max_glyph_width(); x++)
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for (int y = 0; y < font().glyph_height(); y++)
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bitmap.set_bit_at(x, y, state.m_bits[x][y]);
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m_restored_width = state.m_width;
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m_restored_code_point = state.m_code_point;
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}
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void set_code_point(u32 code_point) { m_code_point = code_point; }
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void set_font(Gfx::BitmapFont& font) { m_font = font; }
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Gfx::BitmapFont const& font() const { return *m_font; }
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u8 restored_width() const { return m_restored_width; }
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u32 restored_code_point() const { return m_restored_code_point; }
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private:
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u32 m_code_point { 0 };
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RefPtr<Gfx::BitmapFont> m_font;
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u8 m_bits[Gfx::GlyphBitmap::max_width()][Gfx::GlyphBitmap::max_height()] {};
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u8 m_width { 0 };
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mutable u8 m_restored_width { 0 };
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mutable u32 m_restored_code_point { 0 };
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};
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class GlyphUndoCommand : public GUI::Command {
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public:
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GlyphUndoCommand(UndoGlyph& glyph)
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: m_undo_state(glyph.save_state())
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, m_undo_glyph(glyph)
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{
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}
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virtual void undo() override
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{
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if (!m_redo_state)
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m_redo_state = m_undo_state->save_state();
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m_undo_glyph.restore_state(*m_undo_state);
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}
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virtual void redo() override
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{
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m_undo_glyph.restore_state(*m_redo_state);
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}
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private:
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NonnullRefPtr<UndoGlyph> m_undo_state;
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RefPtr<UndoGlyph> m_redo_state;
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UndoGlyph& m_undo_glyph;
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};
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