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FontEditor: Support flipping and rotating

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This is especially useful for highly symmetric scripts like this:
https://www.unicode.org/charts/PDF/U1400.pdf
This commit is contained in:
Ben Wiederhake 2021-11-20 02:38:24 +01:00 • committed by Andreas Kling
parent 1dfb3ff4eb
commit 7180813cd4
4 changed files with 138 additions and 2 deletions
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86
Userland/Applications/FontEditor/GlyphEditorWidget.cpp
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@ -250,6 +250,92 @@ void GlyphEditorWidget::move_at_mouse(const GUI::MouseEvent& event)
update();
}
static Vector<Vector<u8>> glyph_as_matrix(Gfx::GlyphBitmap const& bitmap)
{
Vector<Vector<u8>> result;
result.ensure_capacity(bitmap.height());
for (int y = 0; y < bitmap.height(); y++) {
result.empend();
auto& row = result.last();
row.ensure_capacity(bitmap.width());
for (int x = 0; x < bitmap.width(); x++) {
row.append(bitmap.bit_at(x, y));
}
}
return result;
}
void GlyphEditorWidget::rotate_90()
{
if (on_undo_event)
on_undo_event();
auto bitmap = font().raw_glyph(m_glyph).glyph_bitmap();
auto matrix = glyph_as_matrix(bitmap);
for (int y = 0; y < bitmap.height(); y++) {
for (int x = 0; x < bitmap.width(); x++) {
int source_x = y;
int source_y = bitmap.width() - 1 - x;
bool value = false;
if (source_x < bitmap.width() && source_y < bitmap.height()) {
value = matrix[source_y][source_x];
}
bitmap.set_bit_at(x, y, value);
}
}
if (on_glyph_altered)
on_glyph_altered(m_glyph);
update();
}
void GlyphEditorWidget::flip_vertically()
{
if (on_undo_event)
on_undo_event();
auto bitmap = font().raw_glyph(m_glyph).glyph_bitmap();
auto matrix = glyph_as_matrix(bitmap);
for (int y = 0; y < bitmap.height(); y++) {
for (int x = 0; x < bitmap.width(); x++) {
int source_x = x;
int source_y = bitmap.height() - 1 - y;
bool value = matrix[source_y][source_x];
bitmap.set_bit_at(x, y, value);
}
}
if (on_glyph_altered)
on_glyph_altered(m_glyph);
update();
}
void GlyphEditorWidget::flip_horizontally()
{
if (on_undo_event)
on_undo_event();
auto bitmap = font().raw_glyph(m_glyph).glyph_bitmap();
auto matrix = glyph_as_matrix(bitmap);
for (int y = 0; y < bitmap.height(); y++) {
for (int x = 0; x < bitmap.width(); x++) {
int source_x = bitmap.width() - 1 - x;
int source_y = y;
bool value = matrix[source_y][source_x];
bitmap.set_bit_at(x, y, value);
}
}
if (on_glyph_altered)
on_glyph_altered(m_glyph);
update();
}
int GlyphEditorWidget::preferred_width() const
{
return frame_thickness() * 2 + font().max_glyph_width() * m_scale - 1;