Fix an unsigned overflow error in Text

[libs/gltk.git] / source / text.cpp

diff --git a/source/text.cpp b/source/text.cpp
index 08846a4c75acd587fa47bce8dd1b835cbd42e153..45b6567db5c640bcec37e0dfccee877323fde230 100644 (file)
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -66,6 +66,13 @@ unsigned Text::get_height() const
        return line_height+(lines.size()-1)*line_spacing;
 }
 
+void Text::autosize(const Part &part, Geometry &geom) const
+{
+       const Sides &margin = part.get_margin();
+       geom.w = max(geom.w, get_width()+margin.left+margin.right);
+       geom.h = max(geom.h, get_height()+margin.top+margin.bottom);
+}
+
 void Text::set(const string &t)
 {
        text = t;
@@ -108,6 +115,23 @@ void Text::insert(unsigned pos, const string &s)
        }
 }
 
+unsigned Text::get_visible_lines(const Part &part, const Geometry &parent, unsigned *fit_height) const
+{
+       const GL::Font &font = style->get_font();
+       float font_size = style->get_font_size();
+       unsigned line_height = static_cast<unsigned>((font.get_ascent()-font.get_descent())*font_size);
+       unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
+
+       const Sides &margin = part.get_margin();
+       unsigned vmargin = margin.top+margin.bottom;
+       unsigned free_height = max(parent.h, vmargin)-vmargin+line_spacing-line_height;
+       unsigned n_lines = min<unsigned>(lines.size(), max(free_height/line_spacing, 1U));
+       if(fit_height)
+               *fit_height = line_height+(n_lines-1)*line_spacing;
+
+       return n_lines;
+}
+
 unsigned Text::get_line_length(unsigned i) const
 {
        if(i>=lines.size())
@@ -153,36 +177,29 @@ Geometry Text::coords_to_geometry(const Part &part, const Geometry &parent, unsi
        data.row = row;
        data.col = col;
 
-       process_lines<CoordsToGeomData, &Text::coords_to_geom_line>(part, parent, first_row, data);
+       process_lines(part, parent, first_row, &Text::coords_to_geom_line, data);
 
        return data.result;
 }
 
-void Text::build(const Part &part, const Geometry &parent, CachedPart &cache) const
+void Text::build(const Part &part, State state, const Geometry &parent, PartCache &cache) const
 {
-       build(part, parent, 0, cache);
+       build(part, state, parent, 0, cache);
 }
 
-void Text::build(const Part &part, const Geometry &parent, unsigned first_row, CachedPart &cache) const
+void Text::build(const Part &part, State state, const Geometry &parent, unsigned first_row, PartCache &cache) const
 {
        if(!style || lines.empty())
-       {
-               cache.texture = 0;
                return;
-       }
-
-       cache.clear_mesh();
-       GL::MeshBuilder bld(*cache.mesh);
 
        const GL::Font &font = style->get_font();
-       bld.color(style->get_font_color());
+       GL::MeshBuilder bld(cache.create_mesh(part, font.get_texture()));
+       bld.color(style->get_font_color(state));
 
        RenderData data;
        data.bld = &bld;
 
-       cache.texture = &font.get_texture();
-
-       process_lines<RenderData, &Text::build_line>(part, parent, first_row, data);
+       process_lines(part, parent, first_row, &Text::build_line, data);
 }
 
 Text &Text::operator=(const string &t)
@@ -217,22 +234,20 @@ void Text::find_lines()
        }
 }
 
-template<typename T, void (Text::*func)(unsigned, const Geometry &, T &) const>
-void Text::process_lines(const Part &part, const Geometry &parent, unsigned first_row, T &data) const
+template<typename T>
+void Text::process_lines(const Part &part, const Geometry &parent, unsigned first_row, void (Text::*func)(unsigned, const Geometry &, T &) const, T &data) const
 {
        if(!style)
                return;
 
        const GL::Font &font = style->get_font();
        float font_size = style->get_font_size();
-       unsigned line_height = static_cast<unsigned>((font.get_ascent()-font.get_descent())*font_size);
        unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
-       unsigned height = line_height+(lines.size()-1)*line_spacing;
        int y_offset = static_cast<int>(-font.get_descent()*font_size);
 
-       const Sides &margin = part.get_margin();
-       unsigned n_lines = min(lines.size(), max((parent.h-margin.top-margin.bottom)/line_spacing, 1U));
-       first_row = min(first_row, lines.size()-n_lines);
+       unsigned fit_height;
+       unsigned n_lines = get_visible_lines(part, parent, &fit_height);
+       first_row = min<unsigned>(first_row, lines.size()-n_lines);
 
        for(unsigned i=0; i<n_lines; ++i)
        {
@@ -240,7 +255,7 @@ void Text::process_lines(const Part &part, const Geometry &parent, unsigned firs
 
                Geometry rgeom;
                rgeom.w = line.width;
-               rgeom.h = height;
+               rgeom.h = fit_height;
                rgeom.y = (n_lines-1-i)*line_spacing+y_offset;
                part.get_alignment().apply(rgeom, parent, part.get_margin());