ScaledFont.h 4.1 KB

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  1. /*
  2. * Copyright (c) 2022, the SerenityOS developers.
  3. *
  4. * SPDX-License-Identifier: BSD-2-Clause
  5. */
  6. #pragma once
  7. #include <AK/HashMap.h>
  8. #include <LibGfx/Bitmap.h>
  9. #include <LibGfx/Font/Font.h>
  10. #include <LibGfx/Font/VectorFont.h>
  11. #define POINTS_PER_INCH 72.0f
  12. #define DEFAULT_DPI 96
  13. namespace Gfx {
  14. class ScaledFont : public Gfx::Font {
  15. public:
  16. ScaledFont(NonnullRefPtr<VectorFont> font, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI)
  17. : m_font(move(font))
  18. , m_point_width(point_width)
  19. , m_point_height(point_height)
  20. {
  21. float units_per_em = m_font->units_per_em();
  22. m_x_scale = (point_width * dpi_x) / (POINTS_PER_INCH * units_per_em);
  23. m_y_scale = (point_height * dpi_y) / (POINTS_PER_INCH * units_per_em);
  24. }
  25. u32 glyph_id_for_code_point(u32 code_point) const { return m_font->glyph_id_for_code_point(code_point); }
  26. ScaledFontMetrics metrics() const { return m_font->metrics(m_x_scale, m_y_scale); }
  27. ScaledGlyphMetrics glyph_metrics(u32 glyph_id) const { return m_font->glyph_metrics(glyph_id, m_x_scale, m_y_scale); }
  28. RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id) const;
  29. // ^Gfx::Font
  30. virtual NonnullRefPtr<Font> clone() const override { return *this; } // FIXME: clone() should not need to be implemented
  31. virtual u8 presentation_size() const override { return m_point_height; }
  32. virtual int pixel_size() const override { return m_point_height * 1.33333333f; }
  33. virtual float point_size() const override { return m_point_height; }
  34. virtual Gfx::FontPixelMetrics pixel_metrics() const override;
  35. virtual u8 slope() const override { return m_font->slope(); }
  36. virtual u16 weight() const override { return m_font->weight(); }
  37. virtual Gfx::Glyph glyph(u32 code_point) const override;
  38. virtual bool contains_glyph(u32 code_point) const override { return m_font->glyph_id_for_code_point(code_point) > 0; }
  39. virtual u8 glyph_width(u32 code_point) const override;
  40. virtual int glyph_or_emoji_width(u32 code_point) const override;
  41. virtual float glyphs_horizontal_kerning(u32 left_code_point, u32 right_code_point) const override;
  42. virtual int preferred_line_height() const override { return metrics().height() + metrics().line_gap; }
  43. virtual u8 glyph_height() const override { return m_point_height; }
  44. virtual int x_height() const override { return m_point_height; } // FIXME: Read from font
  45. virtual u8 min_glyph_width() const override { return 1; } // FIXME: Read from font
  46. virtual u8 max_glyph_width() const override { return m_point_width; } // FIXME: Read from font
  47. virtual u8 glyph_fixed_width() const override;
  48. virtual u8 baseline() const override { return m_point_height; } // FIXME: Read from font
  49. virtual u8 mean_line() const override { return m_point_height; } // FIXME: Read from font
  50. virtual int width(StringView) const override;
  51. virtual int width(Utf8View const&) const override;
  52. virtual int width(Utf32View const&) const override;
  53. virtual String name() const override { return String::formatted("{} {}", family(), variant()); }
  54. virtual bool is_fixed_width() const override { return m_font->is_fixed_width(); }
  55. virtual u8 glyph_spacing() const override { return 0; }
  56. virtual size_t glyph_count() const override { return m_font->glyph_count(); }
  57. virtual String family() const override { return m_font->family(); }
  58. virtual String variant() const override { return m_font->variant(); }
  59. virtual String qualified_name() const override { return String::formatted("{} {} {} {}", family(), presentation_size(), weight(), slope()); }
  60. virtual String human_readable_name() const override { return String::formatted("{} {} {}", family(), variant(), presentation_size()); }
  61. private:
  62. NonnullRefPtr<VectorFont> m_font;
  63. float m_x_scale { 0.0f };
  64. float m_y_scale { 0.0f };
  65. float m_point_width { 0.0f };
  66. float m_point_height { 0.0f };
  67. mutable HashMap<u32, RefPtr<Gfx::Bitmap>> m_cached_glyph_bitmaps;
  68. template<typename T>
  69. int unicode_view_width(T const& view) const;
  70. };
  71. }