152 lines
5.2 KiB
C++
152 lines
5.2 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) 2021-2022 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 <harfbuzz/hb.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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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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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_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_face->style_flags & FT_STYLE_FLAG_ITALIC );
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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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#if 0
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/**
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* Draw a string.
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*
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* @param aGal
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* @param aText is the text to be drawn.
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* @param aPosition is the text position in world coordinates.
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* @param aOrigin is the item origin
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* @param aAttributes contains text attributes (angle, line spacing, ...)
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* @return bounding box width/height
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*/
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VECTOR2D Draw( KIGFX::GAL* aGal, const UTF8& aText, const VECTOR2D& aPosition,
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const VECTOR2D& aOrigin, const TEXT_ATTRIBUTES& aAttributes ) const override;
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#endif
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/**
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* Compute the vertical position of an overbar. This is the distance between the text
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* baseline and the overbar.
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*/
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double ComputeOverbarVerticalPosition( double aGlyphHeight ) const override;
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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 = 0.0, double aLineSpacing = 1.0 ) const override;
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VECTOR2I GetTextAsGlyphs( BOX2I* aBoundingBox, std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
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const UTF8& aText, const VECTOR2D& aSize, const VECTOR2I& aPosition,
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const EDA_ANGLE& aAngle, bool aMirror, const VECTOR2I& aOrigin,
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TEXT_STYLE_FLAGS aTextStyle ) const override;
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/**
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* Like GetTextAsGlyphs, but handles multiple lines.
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* TODO: Combine with GetTextAsGlyphs, maybe with a boolean parameter,
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* but it's possible a non-line-breaking version isn't even needed
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*
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* @param aGlyphs returns text glyphs
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* @param aText the text item
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*/
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void GetLinesAsGlyphs( std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
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const EDA_TEXT* aText ) const;
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void GetLinesAsGlyphs( std::vector<std::unique_ptr<GLYPH>>* aGlyphs, const UTF8& aText,
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const VECTOR2I& aPosition, const TEXT_ATTRIBUTES& aAttrs ) 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 UTF8& 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 );
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bool loadFontSimple( const wxString& aFontFileName );
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BOX2I getBoundingBox( const std::vector<std::unique_ptr<GLYPH>>& aGlyphs ) const;
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private:
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// FreeType variables
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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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FT_Face m_subscriptFace;
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int m_faceScaler;
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int m_subscriptFaceScaler;
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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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};
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} //namespace KIFONT
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#endif // OUTLINE_FONT_H_
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