kicad/common/font/stroke_font.cpp

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2013 CERN
* @author Maciej Suminski <maciej.suminski@cern.ch>
* Copyright (C) 2016-2023 Kicad Developers, see AUTHORS.txt for contributors.
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*
* Stroke font class
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <gal/graphics_abstraction_layer.h>
#include <wx/string.h>
#include <wx/textfile.h>
#include <newstroke_font.h>
#include <font/glyph.h>
#include <font/stroke_font.h>
#include <geometry/shape_line_chain.h>
#include <trigo.h>
// The "official" name of the building Kicad stroke font (always existing)
#include <font/kicad_font_name.h>
#include <mutex>
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using namespace KIFONT;
///< Factor that determines relative vertical position of the overbar.
static constexpr double OVERBAR_POSITION_FACTOR = 1.23;
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///< Factor that determines relative vertical position of the underline.
static constexpr double UNDERLINE_POSITION_FACTOR = -0.16;
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///< Scale factor for a glyph
static constexpr double STROKE_FONT_SCALE = 1.0 / 21.0;
///< Offset (in stroke font units) to move the origin to the baseline.
static constexpr int FONT_OFFSET = -8;
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bool g_defaultFontInitialized = false;
std::vector<std::shared_ptr<GLYPH>> g_defaultFontGlyphs;
std::vector<BOX2D>* g_defaultFontGlyphBoundingBoxes;
std::mutex g_defaultFontLoadMutex;
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STROKE_FONT::STROKE_FONT() :
m_glyphs( nullptr ),
m_glyphBoundingBoxes( nullptr ),
m_maxGlyphWidth( 0.0 )
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{
}
STROKE_FONT* STROKE_FONT::LoadFont( const wxString& aFontName )
{
if( aFontName.empty() )
{
STROKE_FONT* font = new STROKE_FONT();
font->loadNewStrokeFont( newstroke_font, newstroke_font_bufsize );
return font;
}
else
{
// FONT TODO: support for other stroke fonts?
return nullptr;
}
}
void buildGlyphBoundingBox( std::shared_ptr<STROKE_GLYPH>& aGlyph, double aGlyphWidth )
{
VECTOR2D min( 0, 0 );
VECTOR2D max( aGlyphWidth, 0 );
for( const std::vector<VECTOR2D>& pointList : *aGlyph )
{
for( const VECTOR2D& point : pointList )
{
min.y = std::min( min.y, point.y );
max.y = std::max( max.y, point.y );
}
}
aGlyph->SetBoundingBox( BOX2D( min, max - min ) );
}
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void STROKE_FONT::loadNewStrokeFont( const char* const aNewStrokeFont[], int aNewStrokeFontSize )
{
// Protect the initialization sequence against multiple entries
std::lock_guard<std::mutex> lock( g_defaultFontLoadMutex );
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if( !g_defaultFontInitialized )
{
g_defaultFontGlyphs.reserve( aNewStrokeFontSize );
g_defaultFontGlyphBoundingBoxes = new std::vector<BOX2D>;
g_defaultFontGlyphBoundingBoxes->reserve( aNewStrokeFontSize );
for( int j = 0; j < aNewStrokeFontSize; j++ )
{
std::shared_ptr<STROKE_GLYPH> glyph = std::make_shared<STROKE_GLYPH>();
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double glyphStartX = 0.0;
double glyphEndX = 0.0;
double glyphWidth = 0.0;
int strokes = 0;
int i = 0;
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while( aNewStrokeFont[j][i] )
{
if( aNewStrokeFont[j][i] == ' ' && aNewStrokeFont[j][i+1] == 'R' )
strokes++;
i += 2;
}
glyph->reserve( strokes + 1 );
i = 0;
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while( aNewStrokeFont[j][i] )
{
VECTOR2D point( 0.0, 0.0 );
char coordinate[2] = { 0, };
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for( int k : { 0, 1 } )
coordinate[k] = aNewStrokeFont[j][i + k];
if( i < 2 )
{
// The first two values contain the width of the char
glyphStartX = ( coordinate[0] - 'R' ) * STROKE_FONT_SCALE;
glyphEndX = ( coordinate[1] - 'R' ) * STROKE_FONT_SCALE;
glyphWidth = glyphEndX - glyphStartX;
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}
else if( ( coordinate[0] == ' ' ) && ( coordinate[1] == 'R' ) )
{
glyph->RaisePen();
}
else
{
// In stroke font, coordinates values are coded as <value> + 'R', where
// <value> is an ASCII char.
// therefore every coordinate description of the Hershey format has an offset,
// it has to be subtracted
// Note:
// * the stroke coordinates are stored in reduced form (-1.0 to +1.0),
// and the actual size is stroke coordinate * glyph size
// * a few shapes have a height slightly bigger than 1.0 ( like '{' '[' )
point.x = (double) ( coordinate[0] - 'R' ) * STROKE_FONT_SCALE - glyphStartX;
// FONT_OFFSET is here for historical reasons, due to the way the stroke font
// was built. It allows shapes coordinates like W M ... to be >= 0
// Only shapes like j y have coordinates < 0
point.y = (double) ( coordinate[1] - 'R' + FONT_OFFSET ) * STROKE_FONT_SCALE;
glyph->AddPoint( point );
}
i += 2;
}
glyph->Finalize();
// Compute the bounding box of the glyph
buildGlyphBoundingBox( glyph, glyphWidth );
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g_defaultFontGlyphBoundingBoxes->emplace_back( glyph->BoundingBox() );
g_defaultFontGlyphs.push_back( glyph );
m_maxGlyphWidth = std::max( m_maxGlyphWidth, glyphWidth );
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}
g_defaultFontInitialized = true;
}
m_glyphs = &g_defaultFontGlyphs;
m_glyphBoundingBoxes = g_defaultFontGlyphBoundingBoxes;
m_fontName = KICAD_FONT_NAME;
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m_fontFileName = wxEmptyString;
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}
double STROKE_FONT::GetInterline( double aGlyphHeight, double aLineSpacing ) const
{
// Do not add the glyph thickness to the interline. This makes bold text line-spacing
// different from normal text, which is poor typography.
return ( aGlyphHeight * aLineSpacing * INTERLINE_PITCH_RATIO );
}
double STROKE_FONT::ComputeOverbarVerticalPosition( double aGlyphHeight ) const
{
return aGlyphHeight * OVERBAR_POSITION_FACTOR;
}
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double STROKE_FONT::ComputeUnderlineVerticalPosition( double aGlyphHeight ) const
{
return aGlyphHeight * UNDERLINE_POSITION_FACTOR;
}
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VECTOR2I STROKE_FONT::GetTextAsGlyphs( BOX2I* aBBox, std::vector<std::unique_ptr<GLYPH>>* aGlyphs,
const wxString& aText, const VECTOR2I& aSize,
const VECTOR2I& aPosition, const EDA_ANGLE& aAngle,
bool aMirror, const VECTOR2I& aOrigin,
TEXT_STYLE_FLAGS aTextStyle ) const
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{
constexpr int TAB_WIDTH = 4;
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constexpr double INTER_CHAR = 0.2;
constexpr double SUPER_SUB_SIZE_MULTIPLIER = 0.8;
constexpr double SUPER_HEIGHT_OFFSET = 0.35;
constexpr double SUB_HEIGHT_OFFSET = 0.15;
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VECTOR2I cursor( aPosition );
VECTOR2D glyphSize( aSize );
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double tilt = ( aTextStyle & TEXT_STYLE::ITALIC ) ? ITALIC_TILT : 0.0;
double space_width = m_glyphBoundingBoxes->front().GetWidth(); // First char is space
int char_count = 0;
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if( aTextStyle & TEXT_STYLE::SUBSCRIPT || aTextStyle & TEXT_STYLE::SUPERSCRIPT )
{
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glyphSize = glyphSize * SUPER_SUB_SIZE_MULTIPLIER;
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if( aTextStyle & TEXT_STYLE::SUBSCRIPT )
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cursor.y += glyphSize.y * SUB_HEIGHT_OFFSET;
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else
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cursor.y -= glyphSize.y * SUPER_HEIGHT_OFFSET;
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}
for( wxUniChar c : aText )
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{
// Handle tabs as locked to the next 4th column (in base-widths).
if( c == '\t' )
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{
char_count = ( char_count / TAB_WIDTH + 1 ) * TAB_WIDTH - 1;
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int new_cursor = aPosition.x + aSize.x * char_count
+ aSize.x * space_width;
while( new_cursor <= cursor.x )
{
char_count += TAB_WIDTH;
new_cursor += aSize.x * TAB_WIDTH;
}
cursor.x = new_cursor;
}
else if( c == ' ' )
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{
// 'space' character - draw nothing, advance cursor position
cursor.x += KiROUND( glyphSize.x * space_width );
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}
else
{
// dd is the index into bounding boxes table
int dd = (signed) c - ' ';
// Filtering non existing glyphs and non printable chars
if( dd < 0 || dd >= (int) m_glyphBoundingBoxes->size() )
{
c = '?';
dd = (signed) c - ' ';
}
STROKE_GLYPH* source = static_cast<STROKE_GLYPH*>( m_glyphs->at( dd ).get() );
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if( aGlyphs )
{
aGlyphs->push_back( source->Transform( glyphSize, cursor, tilt, aAngle, aMirror,
aOrigin ) );
}
VECTOR2D glyphExtents = source->BoundingBox().GetEnd();
glyphExtents *= glyphSize;
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cursor.x += KiROUND( glyphExtents.x );
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}
++char_count;
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}
if( aBBox )
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{
aBBox->SetOrigin( aPosition );
aBBox->SetEnd( cursor.x - KiROUND( glyphSize.x * INTER_CHAR ), cursor.y + glyphSize.y );
aBBox->Normalize();
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}
return VECTOR2I( cursor.x, aPosition.y );
}