mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 15:42:44 +00:00
44025e837f
This fixes an issue where we'd truncate the fractional part of each glyph width, often making the returned width slightly too short.
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/*
|
|
* 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;
|
|
float width = 0;
|
|
float 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,
|
|
};
|
|
}
|
|
|
|
}
|