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LibGfx: Move ScaledFont and new base class VectorFont out of TTF

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Simon Wanner 2022-04-09 10:14:58 +02:00 • committed by Andreas Kling
parent 206d6ece55
commit 5136c5ae1a
9 changed files with 260 additions and 199 deletions
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107
Userland/Libraries/LibGfx/Font/ScaledFont.cpp Normal file
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/*
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Utf32View.h>
#include <AK/Utf8View.h>
#include <LibGfx/Font/ScaledFont.h>
namespace Gfx {
int ScaledFont::width(StringView view) const { return unicode_view_width(Utf8View(view)); }
int ScaledFont::width(Utf8View const& view) const { return unicode_view_width(view); }
int ScaledFont::width(Utf32View const& view) const { return unicode_view_width(view); }
template<typename T>
ALWAYS_INLINE int ScaledFont::unicode_view_width(T const& view) const
{
if (view.is_empty())
return 0;
int width = 0;
int longest_width = 0;
u32 last_code_point = 0;
for (auto code_point : view) {
if (code_point == '\n' || code_point == '\r') {
longest_width = max(width, longest_width);
width = 0;
last_code_point = code_point;
continue;
}
u32 glyph_id = glyph_id_for_code_point(code_point);
auto kerning = glyphs_horizontal_kerning(last_code_point, code_point);
width += kerning + glyph_metrics(glyph_id).advance_width;
last_code_point = code_point;
}
longest_width = max(width, longest_width);
return longest_width;
}
RefPtr<Gfx::Bitmap> ScaledFont::rasterize_glyph(u32 glyph_id) const
{
auto glyph_iterator = m_cached_glyph_bitmaps.find(glyph_id);
if (glyph_iterator != m_cached_glyph_bitmaps.end())
return glyph_iterator->value;
auto glyph_bitmap = m_font->rasterize_glyph(glyph_id, m_x_scale, m_y_scale);
m_cached_glyph_bitmaps.set(glyph_id, glyph_bitmap);
return glyph_bitmap;
}
Gfx::Glyph ScaledFont::glyph(u32 code_point) const
{
auto id = glyph_id_for_code_point(code_point);
auto bitmap = rasterize_glyph(id);
auto metrics = glyph_metrics(id);
return Gfx::Glyph(bitmap, metrics.left_side_bearing, metrics.advance_width, metrics.ascender);
}
u8 ScaledFont::glyph_width(u32 code_point) const
{
auto id = glyph_id_for_code_point(code_point);
auto metrics = glyph_metrics(id);
return metrics.advance_width;
}
int ScaledFont::glyph_or_emoji_width(u32 code_point) const
{
auto id = glyph_id_for_code_point(code_point);
auto metrics = glyph_metrics(id);
return metrics.advance_width;
}
float ScaledFont::glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const
{
if (left_code_point == 0 || right_code_point == 0)
return 0.f;
auto left_glyph_id = glyph_id_for_code_point(left_code_point);
auto right_glyph_id = glyph_id_for_code_point(right_code_point);
if (left_glyph_id == 0 || right_glyph_id == 0)
return 0.f;
return m_font->glyphs_horizontal_kerning(left_glyph_id, right_glyph_id, m_x_scale);
}
u8 ScaledFont::glyph_fixed_width() const
{
return glyph_metrics(glyph_id_for_code_point(' ')).advance_width;
}
Gfx::FontPixelMetrics ScaledFont::pixel_metrics() const
{
auto metrics = m_font->metrics(m_x_scale, m_y_scale);
return Gfx::FontPixelMetrics {
.size = (float)pixel_size(),
.x_height = (float)x_height(),
.advance_of_ascii_zero = (float)glyph_width('0'),
.glyph_spacing = (float)glyph_spacing(),
.ascent = metrics.ascender,
.descent = -metrics.descender,
.line_gap = metrics.line_gap,
};
}
}