Add simple ligature support to Font

[libs/gl.git] / source / font.cpp

diff --git a/source/font.cpp b/source/font.cpp
index 54631926e4e1b3ae22da55afff111450fc9719e0..3fd24d8ea0ebde029e262d137dcfaf509b0db5ee 100644 (file)
--- a/source/font.cpp
+++ b/source/font.cpp
@@ -44,7 +44,7 @@ void Font::add_glyph(const Glyph &g)
 
 void Font::set_kerning(unsigned l, unsigned r, float d)
 {
 
 void Font::set_kerning(unsigned l, unsigned r, float d)
 {

-       kerning[KerningKey(l, r)] = d;
+       kerning[CodePair(l, r)] = d;

 }
 
 float Font::get_string_width(const string &str, StringCodec::Decoder &dec) const
 }
 
 float Font::get_string_width(const string &str, StringCodec::Decoder &dec) const


@@ -77,9 +77,18 @@ void Font::build_string(const string &str, StringCodec::Decoder &dec, PrimitiveB
        MatrixStack::Push push_mtx(bld.matrix());
 
        unsigned prev = 0;
        MatrixStack::Push push_mtx(bld.matrix());
 
        unsigned prev = 0;

-       for(string::const_iterator i=str.begin(); i!=str.end();)
+       unsigned next = 0;
+       for(string::const_iterator i=str.begin(); (next || i!=str.end());)

        {
        {

-               unsigned c = dec.decode_char(str, i);
+               unsigned c = (next ? next : dec.decode_char(str, i));
+               next = (i!=str.end() ? dec.decode_char(str, i) : 0);
+
+               if(unsigned lig = get_ligature(c, next))
+               {
+                       c = lig;
+                       next = 0;
+               }
+

                GlyphMap::const_iterator j = glyphs.find(c);
                if(j==glyphs.end())
                        continue;
                GlyphMap::const_iterator j = glyphs.find(c);
                if(j==glyphs.end())
                        continue;


@@ -116,7 +125,7 @@ float Font::get_glyph_advance(unsigned code, unsigned next) const
 
        if(next)
        {
 
        if(next)
        {

-               KerningMap::const_iterator j = kerning.find(KerningKey(code, next));
+               KerningMap::const_iterator j = kerning.find(CodePair(code, next));

                if(j!=kerning.end())
                        advance += j->second;
        }
                if(j!=kerning.end())
                        advance += j->second;
        }


@@ -124,6 +133,12 @@ float Font::get_glyph_advance(unsigned code, unsigned next) const
        return advance;
 }
 
        return advance;
 }
 

+unsigned Font::get_ligature(unsigned code, unsigned next) const
+{
+       LigatureMap::const_iterator i = ligatures.find(CodePair(code, next));
+       return (i!=ligatures.end() ? i->second : 0);
+}
+

 
 Font::Loader::Loader(Font &f):
        DataFile::CollectionObjectLoader<Font>(f, 0)
 
 Font::Loader::Loader(Font &f):
        DataFile::CollectionObjectLoader<Font>(f, 0)


@@ -147,6 +162,7 @@ void Font::Loader::init()
        add("texture",     &Loader::texture_ref);
        add("glyph",       &Loader::glyph);
        add("kerning",     &Loader::kerning);
        add("texture",     &Loader::texture_ref);
        add("glyph",       &Loader::glyph);
        add("kerning",     &Loader::kerning);

+       add("ligature",    &Loader::ligature);

        add("x_height",    &Font::x_height);
 }
 
        add("x_height",    &Font::x_height);
 }
 


@@ -160,7 +176,12 @@ void Font::Loader::glyph(unsigned c)
 
 void Font::Loader::kerning(unsigned l, unsigned r, float d)
 {
 
 void Font::Loader::kerning(unsigned l, unsigned r, float d)
 {

-       obj.kerning[KerningKey(l, r)] = d;
+       obj.kerning[CodePair(l, r)] = d;
+}
+
+void Font::Loader::ligature(unsigned l, unsigned r, unsigned g)
+{
+       obj.ligatures[CodePair(l, r)] = g;

 }
 
 void Font::Loader::texture()
 }
 
 void Font::Loader::texture()