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464d7d5858
For bitmap fonts, we will often not have an exact match for requested sizes. Return the closest match instead of a nullptr. LibWeb is currently the only user of this API. If it needs to be configurable in the future to only allow exact matches, we can add a parameter or another method at that time.
106 lines
5.2 KiB
C++
106 lines
5.2 KiB
C++
/*
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* Copyright (c) 2022, the SerenityOS developers.
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* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
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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 <AK/HashMap.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Font/VectorFont.h>
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namespace Gfx {
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struct GlyphIndexWithSubpixelOffset {
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u32 glyph_id;
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GlyphSubpixelOffset subpixel_offset;
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bool operator==(GlyphIndexWithSubpixelOffset const&) const = default;
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};
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class ScaledFont final : public Gfx::Font {
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public:
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ScaledFont(NonnullRefPtr<VectorFont>, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI);
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u32 glyph_id_for_code_point(u32 code_point) const { return m_font->glyph_id_for_code_point(code_point); }
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ScaledFontMetrics metrics() const { return m_font->metrics(m_x_scale, m_y_scale); }
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ScaledGlyphMetrics glyph_metrics(u32 glyph_id) const { return m_font->glyph_metrics(glyph_id, m_x_scale, m_y_scale, m_point_width, m_point_height); }
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RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id, GlyphSubpixelOffset) const;
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bool append_glyph_path_to(Gfx::Path&, u32 glyph_id) const;
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// ^Gfx::Font
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virtual NonnullRefPtr<Font> clone() const override { return MUST(try_clone()); } // FIXME: clone() should not need to be implemented
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virtual ErrorOr<NonnullRefPtr<Font>> try_clone() const override { return const_cast<ScaledFont&>(*this); }
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virtual u8 presentation_size() const override { return m_point_height; }
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virtual float point_size() const override;
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virtual float pixel_size() const override;
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virtual int pixel_size_rounded_up() const override;
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virtual Gfx::FontPixelMetrics pixel_metrics() const override;
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virtual u8 slope() const override { return m_font->slope(); }
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virtual u16 width() const override { return m_font->width(); }
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virtual u16 weight() const override { return m_font->weight(); }
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virtual Gfx::Glyph glyph(u32 code_point) const override;
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virtual float glyph_left_bearing(u32 code_point) const override;
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virtual Glyph glyph(u32 code_point, GlyphSubpixelOffset) const override;
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virtual bool contains_glyph(u32 code_point) const override { return m_font->glyph_id_for_code_point(code_point) > 0; }
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virtual float glyph_width(u32 code_point) const override;
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virtual float glyph_or_emoji_width(Utf8CodePointIterator&) const override;
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virtual float glyph_or_emoji_width(Utf32CodePointIterator&) const override;
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virtual float glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const override;
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virtual float preferred_line_height() const override { return metrics().height() + metrics().line_gap; }
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virtual int x_height() const override { return m_point_height; } // FIXME: Read from font
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virtual u8 min_glyph_width() const override { return 1; } // FIXME: Read from font
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virtual u8 max_glyph_width() const override { return m_point_width; } // FIXME: Read from font
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virtual u8 glyph_fixed_width() const override;
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virtual u8 baseline() const override { return m_point_height; } // FIXME: Read from font
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virtual u8 mean_line() const override { return m_point_height; } // FIXME: Read from font
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virtual float width(StringView) const override;
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virtual float width(Utf8View const&) const override;
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virtual float width(Utf32View const&) const override;
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virtual int width_rounded_up(StringView) const override;
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virtual String name() const override { return MUST(String::formatted("{} {}", family(), variant())); }
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virtual bool is_fixed_width() const override { return m_font->is_fixed_width(); }
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virtual u8 glyph_spacing() const override { return 0; }
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virtual size_t glyph_count() const override { return m_font->glyph_count(); }
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virtual String family() const override { return m_font->family(); }
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virtual String variant() const override { return m_font->variant(); }
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virtual String qualified_name() const override { return MUST(String::formatted("{} {} {} {}", family(), presentation_size(), weight(), slope())); }
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virtual String human_readable_name() const override { return MUST(String::formatted("{} {} {}", family(), variant(), presentation_size())); }
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virtual NonnullRefPtr<ScaledFont> scaled_with_size(float point_size) const;
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virtual NonnullRefPtr<Font> with_size(float point_size) const override;
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virtual bool has_color_bitmaps() const override { return m_font->has_color_bitmaps(); }
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private:
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NonnullRefPtr<VectorFont> m_font;
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float m_x_scale { 0.0f };
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float m_y_scale { 0.0f };
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float m_point_width { 0.0f };
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float m_point_height { 0.0f };
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mutable HashMap<GlyphIndexWithSubpixelOffset, RefPtr<Gfx::Bitmap>> m_cached_glyph_bitmaps;
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Gfx::FontPixelMetrics m_pixel_metrics;
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float m_pixel_size { 0.0f };
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int m_pixel_size_rounded_up { 0 };
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template<typename T>
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float unicode_view_width(T const& view) const;
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};
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}
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namespace AK {
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template<>
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struct Traits<Gfx::GlyphIndexWithSubpixelOffset> : public DefaultTraits<Gfx::GlyphIndexWithSubpixelOffset> {
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static unsigned hash(Gfx::GlyphIndexWithSubpixelOffset const& index)
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{
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return pair_int_hash(index.glyph_id, (index.subpixel_offset.x << 8) | index.subpixel_offset.y);
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}
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};
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}
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