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102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
/*
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* Copyright (c) 2022, 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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#include <AK/TypeCasts.h>
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#include <AK/Utf8View.h>
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#include <LibGfx/Font/ScaledFont.h>
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#include <LibGfx/Font/TypefaceSkia.h>
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#include <LibGfx/TextLayout.h>
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#include <core/SkFont.h>
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#include <core/SkFontMetrics.h>
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#include <core/SkFontTypes.h>
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namespace Gfx {
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ScaledFont::ScaledFont(NonnullRefPtr<Typeface> typeface, float point_width, float point_height, unsigned dpi_x, unsigned dpi_y)
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: m_typeface(move(typeface))
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, m_point_width(point_width)
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, m_point_height(point_height)
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{
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float const units_per_em = m_typeface->units_per_em();
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m_x_scale = (point_width * dpi_x) / (POINTS_PER_INCH * units_per_em);
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m_y_scale = (point_height * dpi_y) / (POINTS_PER_INCH * units_per_em);
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m_pixel_size = m_point_height * (DEFAULT_DPI / POINTS_PER_INCH);
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m_pixel_size_rounded_up = static_cast<int>(ceilf(m_pixel_size));
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auto const* sk_typeface = verify_cast<TypefaceSkia>(*m_typeface).sk_typeface();
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SkFont const font { sk_ref_sp(sk_typeface), m_pixel_size };
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SkFontMetrics skMetrics;
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font.getMetrics(&skMetrics);
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FontPixelMetrics metrics;
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metrics.size = font.getSize();
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metrics.x_height = skMetrics.fXHeight;
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metrics.advance_of_ascii_zero = font.measureText("0", 1, SkTextEncoding::kUTF8);
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metrics.ascent = -skMetrics.fAscent;
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metrics.descent = skMetrics.fDescent;
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metrics.line_gap = skMetrics.fLeading;
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m_pixel_metrics = metrics;
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}
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ScaledFontMetrics ScaledFont::metrics() const
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{
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SkFontMetrics sk_metrics;
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skia_font(1).getMetrics(&sk_metrics);
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ScaledFontMetrics metrics;
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metrics.ascender = -sk_metrics.fAscent;
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metrics.descender = sk_metrics.fDescent;
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metrics.line_gap = sk_metrics.fLeading;
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metrics.x_height = sk_metrics.fXHeight;
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return metrics;
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}
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float ScaledFont::width(StringView view) const { return measure_text_width(Utf8View(view), *this); }
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float ScaledFont::width(Utf8View const& view) const { return measure_text_width(view, *this); }
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float ScaledFont::glyph_width(u32 code_point) const
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{
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auto string = String::from_code_point(code_point);
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return measure_text_width(Utf8View(string), *this);
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}
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NonnullRefPtr<ScaledFont> ScaledFont::scaled_with_size(float point_size) const
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{
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if (point_size == m_point_height && point_size == m_point_width)
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return *const_cast<ScaledFont*>(this);
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return m_typeface->scaled_font(point_size);
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}
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NonnullRefPtr<Font> ScaledFont::with_size(float point_size) const
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{
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return scaled_with_size(point_size);
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}
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Gfx::FontPixelMetrics ScaledFont::pixel_metrics() const
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{
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return m_pixel_metrics;
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}
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float ScaledFont::pixel_size() const
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{
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return m_pixel_size;
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}
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int ScaledFont::pixel_size_rounded_up() const
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{
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return m_pixel_size_rounded_up;
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}
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float ScaledFont::point_size() const
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{
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return m_point_height;
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}
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}
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