mirror of https://gitlab.com/kicad/code/kicad.git
190 lines
6.8 KiB
C++
190 lines
6.8 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2021 Ola Rinta-Koski
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* Copyright (C) 2021-2023 Kicad Developers, see AUTHORS.txt for contributors.
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*
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* Outline font class
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef OUTLINE_FONT_H_
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#define OUTLINE_FONT_H_
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#include <gal/graphics_abstraction_layer.h>
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#include <geometry/shape_poly_set.h>
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#ifdef _MSC_VER
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#include <ft2build.h>
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#else
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#include <freetype2/ft2build.h>
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#endif
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#include FT_FREETYPE_H
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#include FT_OUTLINE_H
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//#include <gal/opengl/opengl_freetype.h>
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#include <font/font.h>
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#include <font/glyph.h>
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#include <font/outline_decomposer.h>
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#include <mutex>
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namespace KIFONT
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{
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/**
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* Class OUTLINE_FONT implements outline font drawing.
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*/
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class OUTLINE_FONT : public FONT
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{
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public:
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OUTLINE_FONT();
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static wxString FontConfigVersion();
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static wxString FreeTypeVersion();
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static wxString HarfBuzzVersion();
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static wxString FontLibraryVersion();
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bool IsOutline() const override { return true; }
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bool IsBold() const override
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{
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return m_face && ( m_fakeBold || ( m_face->style_flags & FT_STYLE_FLAG_BOLD ) );
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}
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bool IsItalic() const override
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{
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return m_face && ( m_fakeItal || ( m_face->style_flags & FT_STYLE_FLAG_ITALIC ) );
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}
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void SetFakeBold()
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{
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m_fakeBold = true;
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}
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void SetFakeItal()
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{
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m_fakeItal = true;
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}
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/**
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* Load an outline font. TrueType (.ttf) and OpenType (.otf) are supported.
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* @param aFontFileName is the (platform-specific) fully qualified name of the font file
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*/
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static OUTLINE_FONT* LoadFont( const wxString& aFontFileName, bool aBold, bool aItalic );
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/**
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* Compute the distance (interline) between 2 lines of text (for multiline texts). This is
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* the distance between baselines, not the space between line bounding boxes.
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*/
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double GetInterline( double aGlyphHeight, const METRICS& aFontMetrics ) const override;
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VECTOR2I GetTextAsGlyphs( BOX2I* aBoundingBox, std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
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const wxString& aText, const VECTOR2I& aSize,
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const VECTOR2I& aPosition, const EDA_ANGLE& aAngle, bool aMirror,
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const VECTOR2I& aOrigin, TEXT_STYLE_FLAGS aTextStyle ) const override;
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void GetLinesAsGlyphs( std::vector<std::unique_ptr<GLYPH>>* aGlyphs, const wxString& aText,
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const VECTOR2I& aPosition, const TEXT_ATTRIBUTES& aAttrs,
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const METRICS& aFontMetrics ) const;
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const FT_Face& GetFace() const { return m_face; }
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#if 0
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void RenderToOpenGLCanvas( KIGFX::OPENGL_FREETYPE& aTarget, const wxString& aString,
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const VECTOR2D& aSize, const wxPoint& aPosition,
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const EDA_ANGLE& aAngle, bool aMirror ) const;
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#endif
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protected:
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FT_Error loadFace( const wxString& aFontFileName, int aFaceIndex );
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BOX2I getBoundingBox( const std::vector<std::unique_ptr<GLYPH>>& aGlyphs ) const;
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VECTOR2I getTextAsGlyphs( BOX2I* aBoundingBox, std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
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const wxString& aText, const VECTOR2I& aSize,
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const VECTOR2I& aPosition, const EDA_ANGLE& aAngle, bool aMirror,
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const VECTOR2I& aOrigin, TEXT_STYLE_FLAGS aTextStyle ) const;
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private:
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VECTOR2I getTextAsGlyphsUnlocked( BOX2I* aBoundingBox,
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std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
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const wxString& aText, const VECTOR2I& aSize,
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const VECTOR2I& aPosition, const EDA_ANGLE& aAngle,
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bool aMirror, const VECTOR2I& aOrigin,
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TEXT_STYLE_FLAGS aTextStyle ) const;
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private:
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// FreeType variables
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/**
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* Mutex for freetype access, FT_Library and FT_Face are not thread safe
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*/
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static std::mutex m_freeTypeMutex;
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static FT_Library m_freeType;
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FT_Face m_face;
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const int m_faceSize;
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bool m_fakeBold;
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bool m_fakeItal;
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// cache for glyphs converted to straight segments
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// key is glyph index (FT_GlyphSlot field glyph_index)
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std::map<unsigned int, GLYPH_POINTS_LIST> m_contourCache;
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// The height of the KiCad stroke font is the distance between stroke endpoints for a vertical
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// line of cap-height. So the cap-height of the font is actually stroke-width taller than its
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// height.
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// Outline fonts are normally scaled on full-height (including ascenders and descenders), so we
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// need to compensate to keep them from being much smaller than their stroked counterparts.
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static constexpr double m_outlineFontSizeCompensation = 1.4;
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// FT_Set_Char_Size() gets character width and height specified in 1/64ths of a point
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static constexpr int m_charSizeScaler = 64;
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// The KiCad stroke font uses a subscript/superscript size ratio of 0.7. This ratio is also
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// commonly used in LaTeX, but fonts with designed-in subscript and superscript glyphs are more
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// likely to use 0.58.
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// For auto-generated subscript and superscript glyphs in outline fonts we split the difference
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// with 0.64.
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static constexpr double m_subscriptSuperscriptSize = 0.64;
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static constexpr double m_underlineOffsetScaler = -0.16;
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int faceSize( int aSize ) const
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{
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return aSize * m_charSizeScaler * m_outlineFontSizeCompensation;
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};
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int faceSize() const { return faceSize( m_faceSize ); }
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// also for superscripts
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int subscriptSize( int aSize ) const
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{
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return KiROUND( faceSize( aSize ) * m_subscriptSuperscriptSize );
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}
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int subscriptSize() const { return subscriptSize( m_faceSize ); }
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static constexpr double m_subscriptVerticalOffset = -0.25;
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static constexpr double m_superscriptVerticalOffset = 0.45;
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};
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} //namespace KIFONT
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#endif // OUTLINE_FONT_H_
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