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LibGfx: Cache font pixel metrics in ScaledFont
Instead of recomputing the pixel metrics over and over, we can just cache them with the font and avoid a bunch of expensive computation.
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83488cd102
commit
850b4a03e6
2 changed files with 26 additions and 21 deletions
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@ -23,17 +23,9 @@ struct GlyphIndexWithSubpixelOffset {
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bool operator==(GlyphIndexWithSubpixelOffset const&) const = default;
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};
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class ScaledFont : public Gfx::Font {
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class ScaledFont final : public Gfx::Font {
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public:
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ScaledFont(NonnullRefPtr<VectorFont> font, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI)
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: m_font(move(font))
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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 units_per_em = m_font->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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}
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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); }
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@ -81,6 +73,7 @@ private:
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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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template<typename T>
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float unicode_view_width(T const& view) const;
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