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cf52bfcc55
If the font face doesn't include a Bold or Italic version, we still want to display the font as bold/italic, so we fake it with freetype. This also prevents recurring error messages where the outline font warns about "substitutes" within the same font family. Also allows variants on the weight descriptor to be used without throwing a substitution warning Fixes https://gitlab.com/kicad/code/kicad/issues/13654
590 lines
19 KiB
C++
590 lines
19 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 <gitlab@rinta-koski.net>
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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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#include <limits>
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#include <pgm_base.h>
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#include <settings/settings_manager.h>
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#include <harfbuzz/hb.h>
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#include <harfbuzz/hb-ft.h>
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#include <bezier_curves.h>
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#include <geometry/shape_poly_set.h>
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#include <eda_text.h>
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#include <font/fontconfig.h>
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#include <font/outline_font.h>
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#include FT_GLYPH_H
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#include FT_BBOX_H
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#include <trigo.h>
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#include <font/fontconfig.h>
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#include <convert_basic_shapes_to_polygon.h>
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using namespace KIFONT;
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FT_Library OUTLINE_FONT::m_freeType = nullptr;
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OUTLINE_FONT::OUTLINE_FONT() :
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m_face(NULL),
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m_faceSize( 16 ),
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m_fakeBold( false ),
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m_fakeItal( false )
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{
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if( !m_freeType )
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FT_Init_FreeType( &m_freeType );
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}
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wxString OUTLINE_FONT::FreeTypeVersion()
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{
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if( !m_freeType )
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FT_Init_FreeType( &m_freeType );
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FT_Int major = 0;
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FT_Int minor = 0;
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FT_Int patch = 0;
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FT_Library_Version( m_freeType, &major, &minor, &patch );
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return wxString::Format( "%d.%d.%d", major, minor, patch );
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}
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wxString OUTLINE_FONT::HarfBuzzVersion()
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{
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return wxString::FromUTF8( HB_VERSION_STRING );
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}
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wxString OUTLINE_FONT::FontConfigVersion()
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{
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return fontconfig::FONTCONFIG::Version();
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}
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wxString OUTLINE_FONT::FontLibraryVersion()
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{
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return wxString::Format( "FreeType %s HarfBuzz %s", FreeTypeVersion(), HarfBuzzVersion() );
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}
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OUTLINE_FONT* OUTLINE_FONT::LoadFont( const wxString& aFontName, bool aBold, bool aItalic )
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{
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OUTLINE_FONT* font = new OUTLINE_FONT();
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wxString fontFile;
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using fc = fontconfig::FONTCONFIG;
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fc::FF_RESULT retval = Fontconfig()->FindFont( aFontName, fontFile, aBold, aItalic );
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if( retval == fc::FF_RESULT::MISSING_BOLD || retval == fc::FF_RESULT::MISSING_BOLD_ITAL )
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font->SetFakeBold();
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if( retval == fc::FF_RESULT::MISSING_ITAL || retval == fc::FF_RESULT::MISSING_BOLD_ITAL )
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font->SetFakeItal();
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if( retval != fc::FF_RESULT::ERROR )
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(void) font->loadFace( fontFile );
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font->m_fontName = aFontName; // Keep asked-for name, even if we substituted.
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font->m_fontFileName = fontFile;
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return font;
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}
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FT_Error OUTLINE_FONT::loadFace( const wxString& aFontFileName )
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{
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// TODO: check that going from wxString to char* with UTF-8
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// conversion for filename makes sense on any/all platforms
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FT_Error e = FT_New_Face( m_freeType, aFontFileName.mb_str( wxConvUTF8 ), 0, &m_face );
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if( !e )
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{
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FT_Select_Charmap( m_face, FT_Encoding::FT_ENCODING_UNICODE );
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// params:
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// m_face = handle to face object
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// 0 = char width in 1/64th of points ( 0 = same as char height )
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// faceSize() = char height in 1/64th of points
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// GLYPH_RESOLUTION = horizontal device resolution (288dpi, 4x default)
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// 0 = vertical device resolution ( 0 = same as horizontal )
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FT_Set_Char_Size( m_face, 0, faceSize(), GLYPH_RESOLUTION, 0 );
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}
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return e;
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}
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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 OUTLINE_FONT::ComputeOverbarVerticalPosition( double aGlyphHeight ) const
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{
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// The overbar on actual text is positioned above the bounding box of the glyphs. However,
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// that's expensive to calculate so we use an estimation here (as this is only used for
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// calculating bounding boxes).
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return aGlyphHeight * m_outlineFontSizeCompensation;
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}
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/**
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* Compute the vertical position of an underline. This is the distance between the text
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* baseline and the underline.
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*/
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double OUTLINE_FONT::ComputeUnderlineVerticalPosition( double aGlyphHeight ) const
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{
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return aGlyphHeight * m_underlineOffsetScaler;
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}
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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 OUTLINE_FONT::GetInterline( double aGlyphHeight, double aLineSpacing ) const
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{
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double pitch = INTERLINE_PITCH_RATIO;
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if( GetFace()->units_per_EM )
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pitch = GetFace()->height / GetFace()->units_per_EM;
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double interline = aLineSpacing * aGlyphHeight * pitch * m_outlineFontSizeCompensation;
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// FONT TODO this hack is an attempt to fix interline spacing by eyeballing it
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static constexpr double interlineHackMultiplier = 1.2;
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interline *= interlineHackMultiplier;
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return interline;
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}
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static bool contourIsFilled( const CONTOUR& c )
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{
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switch( c.m_Orientation )
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{
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case FT_ORIENTATION_TRUETYPE: return c.m_Winding == 1;
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case FT_ORIENTATION_POSTSCRIPT: return c.m_Winding == -1;
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default: return false;
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}
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}
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static bool contourIsHole( const CONTOUR& c )
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{
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return !contourIsFilled( c );
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}
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BOX2I OUTLINE_FONT::getBoundingBox( const std::vector<std::unique_ptr<GLYPH>>& aGlyphs ) const
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{
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int minX = INT_MAX;
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int minY = INT_MAX;
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int maxX = INT_MIN;
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int maxY = INT_MIN;
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for( const std::unique_ptr<KIFONT::GLYPH>& glyph : aGlyphs )
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{
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BOX2D bbox = glyph->BoundingBox();
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bbox.Normalize();
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if( minX > bbox.GetX() )
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minX = bbox.GetX();
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if( minY > bbox.GetY() )
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minY = bbox.GetY();
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if( maxX < bbox.GetRight() )
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maxX = bbox.GetRight();
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if( maxY < bbox.GetBottom() )
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maxY = bbox.GetBottom();
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}
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BOX2I ret;
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ret.SetOrigin( minX, minY );
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ret.SetEnd( maxX, maxY );
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return ret;
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}
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void OUTLINE_FONT::GetLinesAsGlyphs( std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
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const wxString& aText, const VECTOR2I& aPosition,
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const TEXT_ATTRIBUTES& aAttrs ) const
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{
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wxArrayString strings;
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std::vector<VECTOR2I> positions;
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std::vector<VECTOR2I> extents;
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TEXT_STYLE_FLAGS textStyle = 0;
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if( aAttrs.m_Italic )
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textStyle |= TEXT_STYLE::ITALIC;
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getLinePositions( aText, aPosition, strings, positions, extents, aAttrs );
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for( size_t i = 0; i < strings.GetCount(); i++ )
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{
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(void) drawMarkup( nullptr, aGlyphs, strings.Item( i ), positions[i], aAttrs.m_Size,
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aAttrs.m_Angle, aAttrs.m_Mirrored, aPosition, textStyle );
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}
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}
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VECTOR2I OUTLINE_FONT::GetTextAsGlyphs( BOX2I* aBBox, 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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{
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// HarfBuzz needs further processing to split tab-delimited text into text runs.
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constexpr double TAB_WIDTH = 4 * 0.6;
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VECTOR2I position = aPosition;
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wxString textRun;
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if( aBBox )
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{
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aBBox->SetOrigin( aPosition );
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aBBox->SetEnd( aPosition );
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}
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for( wxUniChar c : aText )
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{
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// Handle tabs as locked to the nearest 4th column (in space-widths).
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if( c == '\t' )
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{
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if( !textRun.IsEmpty() )
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{
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position = getTextAsGlyphs( aBBox, aGlyphs, textRun, aSize, position, aAngle,
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aMirror, aOrigin, aTextStyle );
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textRun.clear();
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}
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int tabWidth = KiROUND( aSize.x * TAB_WIDTH );
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int currentIntrusion = ( position.x - aOrigin.x ) % tabWidth;
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position.x += tabWidth - currentIntrusion;
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}
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else
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{
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textRun += c;
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}
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}
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if( !textRun.IsEmpty() )
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{
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position = getTextAsGlyphs( aBBox, aGlyphs, textRun, aSize, position, aAngle, aMirror,
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aOrigin, aTextStyle );
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}
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return position;
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}
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double OUTLINE_FONT::getOverbarOffset( int ascender, int height, int thickness ) const
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{
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double thicknessRatio = abs( (double) thickness ) / (double) height;
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double ascenderRatio = (double) ascender / (double) height;
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if( thicknessRatio < 0.05 )
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return 0.04;
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else if( ascenderRatio < 0.78 )
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return 0.00;
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else if( ascenderRatio < 0.80 )
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return -0.03;
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else
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return -0.06;
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}
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VECTOR2I OUTLINE_FONT::getTextAsGlyphs( BOX2I* aBBox, 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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{
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VECTOR2D glyphSize = aSize;
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FT_Face face = m_face;
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double scaler = faceSize();
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if( IsSubscript( aTextStyle ) || IsSuperscript( aTextStyle ) )
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{
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scaler = subscriptSize();
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}
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// set glyph resolution so that FT_Load_Glyph() results are good enough for decomposing
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FT_Set_Char_Size( face, 0, scaler, GLYPH_RESOLUTION, 0 );
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hb_buffer_t* buf = hb_buffer_create();
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hb_buffer_add_utf8( buf, UTF8( aText ).c_str(), -1, 0, -1 );
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hb_buffer_guess_segment_properties( buf ); // guess direction, script, and language based on
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// contents
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unsigned int glyphCount;
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hb_glyph_info_t* glyphInfo = hb_buffer_get_glyph_infos( buf, &glyphCount );
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hb_glyph_position_t* glyphPos = hb_buffer_get_glyph_positions( buf, &glyphCount );
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hb_font_t* referencedFont = hb_ft_font_create_referenced( face );
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hb_ft_font_set_funcs( referencedFont );
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hb_shape( referencedFont, buf, nullptr, 0 );
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VECTOR2D scaleFactor( glyphSize.x / faceSize(), -glyphSize.y / faceSize() );
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scaleFactor = scaleFactor * m_outlineFontSizeCompensation;
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VECTOR2I cursor( 0, 0 );
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for( unsigned int i = 0; i < glyphCount; i++ )
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{
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// Don't process glyphs that were already included in a previous cluster
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if( i > 0 && glyphInfo[i].cluster == glyphInfo[i-1].cluster )
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continue;
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if( aGlyphs )
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{
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if( m_fakeItal )
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{
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FT_Matrix matrix;
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// Create a 12 degree slant
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const float angle = ( -M_PI * 12 ) / 180.0f;
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matrix.xx = (FT_Fixed) ( cos( angle ) * 0x10000L );
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matrix.xy = (FT_Fixed) ( -sin( angle ) * 0x10000L );
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matrix.yx = (FT_Fixed) ( 0 * 0x10000L ); // Don't rotate in the y direction
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matrix.yy = (FT_Fixed) ( 1 * 0x10000L );
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FT_Set_Transform(face, &matrix,0);
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}
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FT_Load_Glyph( face, glyphInfo[i].codepoint, FT_LOAD_NO_BITMAP );
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if( m_fakeBold )
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FT_Outline_Embolden( &face->glyph->outline, 1 << 6 );
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// contours is a collection of all outlines in the glyph; for example the 'o' glyph
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// generally contains 2 contours, one for the glyph outline and one for the hole
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CONTOURS contours;
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OUTLINE_DECOMPOSER decomposer( face->glyph->outline );
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decomposer.OutlineToSegments( &contours );
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std::unique_ptr<OUTLINE_GLYPH> glyph = std::make_unique<OUTLINE_GLYPH>();
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std::vector<SHAPE_LINE_CHAIN> holes;
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for( CONTOUR& c : contours )
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{
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GLYPH_POINTS points = c.m_Points;
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SHAPE_LINE_CHAIN shape;
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for( const VECTOR2D& v : points )
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{
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VECTOR2D pt( v + cursor );
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if( IsSubscript( aTextStyle ) )
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pt.y += m_subscriptVerticalOffset * scaler;
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else if( IsSuperscript( aTextStyle ) )
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pt.y += m_superscriptVerticalOffset * scaler;
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pt *= scaleFactor;
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pt += aPosition;
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if( aMirror )
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pt.x = aOrigin.x - ( pt.x - aOrigin.x );
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if( !aAngle.IsZero() )
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RotatePoint( pt, aOrigin, aAngle );
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shape.Append( pt.x, pt.y );
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}
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shape.SetClosed( true );
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if( contourIsHole( c ) )
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holes.push_back( std::move( shape ) );
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else
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glyph->AddOutline( std::move( shape ) );
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}
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for( SHAPE_LINE_CHAIN& hole : holes )
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{
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if( hole.PointCount() )
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{
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for( int ii = 0; ii < glyph->OutlineCount(); ++ii )
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{
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if( glyph->Outline( ii ).PointInside( hole.GetPoint( 0 ) ) )
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{
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glyph->AddHole( std::move( hole ), ii );
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break;
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}
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}
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}
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}
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// FONT TODO we might not want to do Fracture() here;
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// knockout text (eg. silkscreen labels with a background) will
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// need to do that after the contours have been turned into holes
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// and vice versa
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if( glyph->HasHoles() )
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glyph->Fracture( SHAPE_POLY_SET::PM_FAST ); // FONT TODO verify aFastMode
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aGlyphs->push_back( std::move( glyph ) );
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}
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hb_glyph_position_t& pos = glyphPos[i];
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cursor.x += ( pos.x_advance * GLYPH_SIZE_SCALER );
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cursor.y += ( pos.y_advance * GLYPH_SIZE_SCALER );
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}
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int ascender = abs( face->size->metrics.ascender * GLYPH_SIZE_SCALER );
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int height = abs( face->size->metrics.height * GLYPH_SIZE_SCALER );
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int descender = abs( face->size->metrics.descender * GLYPH_SIZE_SCALER );
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VECTOR2I extents( cursor.x * scaleFactor.x, ( ascender + descender ) * abs( scaleFactor.y ) );
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// Font metrics don't include all descenders and diacriticals, so beef them up just a little.
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extents.y *= 1.05;
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if( IsOverbar( aTextStyle ) )
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{
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std::vector<std::unique_ptr<GLYPH>> underscoreGlyphs;
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getTextAsGlyphs( nullptr, &underscoreGlyphs, wxT( "_" ), aSize, { 0, 0 }, ANGLE_0, false,
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{ 0, 0 }, aTextStyle & ~TEXT_STYLE::OVERBAR );
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OUTLINE_GLYPH* underscoreGlyph = static_cast<OUTLINE_GLYPH*>( underscoreGlyphs[0].get() );
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BOX2I underscoreBBox;
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for( const VECTOR2I& pt : underscoreGlyph->Outline( 0 ).CPoints() )
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underscoreBBox.Merge( pt );
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int barThickness = underscoreBBox.GetHeight();
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// Shorten the bar a little so its rounded ends don't make it over-long
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double barTrim = barThickness / 2.0;
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double barOffset = getOverbarOffset( ascender, height, barThickness / scaleFactor.y );
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VECTOR2I topLeft( aPosition );
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VECTOR2I topRight( aPosition );
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topLeft.y += ascender * scaleFactor.y * ( 1.0 + barOffset );
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topRight.y = topLeft.y;
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topLeft.x += barTrim;
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topRight.x += extents.x - barTrim;
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extents.y *= ( 1.0 + barOffset + barOffset );
|
|
extents.x += barTrim;
|
|
|
|
if( IsItalic() )
|
|
{
|
|
topLeft.x += aSize.y * ITALIC_TILT;
|
|
topRight.x += aSize.y * ITALIC_TILT;
|
|
extents.x += aSize.y * ITALIC_TILT;
|
|
}
|
|
|
|
if( aMirror )
|
|
{
|
|
topLeft.x = aOrigin.x - ( topLeft.x - aOrigin.x );
|
|
topRight.x = aOrigin.x - ( topRight.x - aOrigin.x );
|
|
}
|
|
|
|
if( !aAngle.IsZero() )
|
|
{
|
|
RotatePoint( topLeft, aOrigin, aAngle );
|
|
RotatePoint( topRight, aOrigin, aAngle );
|
|
}
|
|
|
|
if( aGlyphs )
|
|
{
|
|
int maxError = KiROUND( barThickness / 48 );
|
|
SHAPE_POLY_SET poly;
|
|
|
|
TransformOvalToPolygon( poly, topLeft, topRight, barThickness, maxError, ERROR_INSIDE );
|
|
|
|
std::unique_ptr<OUTLINE_GLYPH> overbarGlyph = std::make_unique<OUTLINE_GLYPH>( poly );
|
|
aGlyphs->push_back( std::move( overbarGlyph ) );
|
|
}
|
|
}
|
|
|
|
hb_buffer_destroy( buf );
|
|
hb_font_destroy( referencedFont );
|
|
|
|
VECTOR2I cursorDisplacement( cursor.x * scaleFactor.x, -cursor.y * scaleFactor.y );
|
|
|
|
if( aBBox )
|
|
aBBox->Merge( aPosition + extents );
|
|
|
|
return VECTOR2I( aPosition.x + cursorDisplacement.x, aPosition.y + cursorDisplacement.y );
|
|
}
|
|
|
|
|
|
#undef OUTLINEFONT_RENDER_AS_PIXELS
|
|
#ifdef OUTLINEFONT_RENDER_AS_PIXELS
|
|
/*
|
|
* WIP: eeschema (and PDF output?) should use pixel rendering instead of linear segmentation
|
|
*/
|
|
void OUTLINE_FONT::RenderToOpenGLCanvas( KIGFX::OPENGL_GAL& aGal, const wxString& aString,
|
|
const VECTOR2D& aGlyphSize, const VECTOR2I& aPosition,
|
|
const EDA_ANGLE& aOrientation, bool aIsMirrored ) const
|
|
{
|
|
hb_buffer_t* buf = hb_buffer_create();
|
|
hb_buffer_add_utf8( buf, UTF8( aString ).c_str(), -1, 0, -1 );
|
|
hb_buffer_guess_segment_properties( buf ); // guess direction, script, and language based on contents
|
|
|
|
unsigned int glyphCount;
|
|
hb_glyph_info_t* glyphInfo = hb_buffer_get_glyph_infos( buf, &glyphCount );
|
|
hb_glyph_position_t* glyphPos = hb_buffer_get_glyph_positions( buf, &glyphCount );
|
|
hb_font_t* referencedFont = hb_ft_font_create_referenced( m_face );
|
|
|
|
hb_ft_font_set_funcs( referencedFont );
|
|
hb_shape( referencedFont, buf, nullptr, 0 );
|
|
|
|
const double mirror_factor = ( aIsMirrored ? 1 : -1 );
|
|
const double x_scaleFactor = mirror_factor * aGlyphSize.x / mScaler;
|
|
const double y_scaleFactor = aGlyphSize.y / mScaler;
|
|
|
|
hb_position_t cursor_x = 0;
|
|
hb_position_t cursor_y = 0;
|
|
|
|
for( unsigned int i = 0; i < glyphCount; i++ )
|
|
{
|
|
hb_glyph_position_t& pos = glyphPos[i];
|
|
int codepoint = glyphInfo[i].codepoint;
|
|
|
|
FT_Error e = FT_Load_Glyph( m_face, codepoint, FT_LOAD_DEFAULT );
|
|
// TODO handle FT_Load_Glyph error
|
|
|
|
FT_Glyph glyph;
|
|
e = FT_Get_Glyph( m_face->glyph, &glyph );
|
|
// TODO handle FT_Get_Glyph error
|
|
|
|
wxPoint pt( aPosition );
|
|
pt.x += ( cursor_x >> 6 ) * x_scaleFactor;
|
|
pt.y += ( cursor_y >> 6 ) * y_scaleFactor;
|
|
|
|
cursor_x += pos.x_advance;
|
|
cursor_y += pos.y_advance;
|
|
}
|
|
|
|
hb_buffer_destroy( buf );
|
|
}
|
|
#endif //OUTLINEFONT_RENDER_AS_PIXELS
|