X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fbuilders%2Ffont.cpp;fp=source%2Fbuilders%2Ffont.cpp;h=5990c57d7223771410edadcfb69a9df13ea39fe0;hp=0000000000000000000000000000000000000000;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e

diff --git a/source/builders/font.cpp b/source/builders/font.cpp
new file mode 100644
index 00000000..5990c57d
--- /dev/null
+++ b/source/builders/font.cpp
@@ -0,0 +1,224 @@
+#include <msp/core/maputils.h>
+#include <msp/datafile/collection.h>
+#include "bindable.h"
+#include "gl.h"
+#include "font.h"
+#include "primitivebuilder.h"
+#include "texture2d.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+Font::Font():
+	native_size(1),
+	ascent(1),
+	descent(0),
+	cap_height(1),
+	x_height(0.5)
+{ }
+
+// Avoid synthesizing ~RefPtr in files including font.h
+Font::~Font()
+{ }
+
+void Font::set_texture(const Texture2D &t)
+{
+	texture = &t;
+	texture.keep();
+}
+
+const Texture2D &Font::get_texture() const
+{
+	if(!texture)
+		throw logic_error("No texture");
+	return *texture;
+}
+
+void Font::add_glyph(const Glyph &g)
+{
+	insert_unique(glyphs, g.code, g);
+}
+
+void Font::set_kerning(unsigned l, unsigned r, float d)
+{
+	kerning[CodePair(l, r)] = d;
+}
+
+float Font::get_string_width(const string &str, StringCodec::Decoder &dec) const
+{
+	float x = 0;
+
+	unsigned prev = 0;
+	for(string::const_iterator i=str.begin(); i!=str.end();)
+	{
+		unsigned c = dec.decode_char(str, i);
+		if(prev)
+			x += get_glyph_advance(prev, c);
+		prev = c;
+	}
+	x += get_glyph_advance(prev);
+
+	return x;
+}
+
+void Font::build_string(const string &str, StringCodec::Decoder &dec, PrimitiveBuilder &bld) const
+{
+	VertexBuilder::PushMatrix push_mtx(bld);
+
+	unsigned prev = 0;
+	unsigned next = 0;
+	for(string::const_iterator i=str.begin(); (next || i!=str.end());)
+	{
+		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;
+
+		if(prev)
+			bld.transform(Matrix::translation(get_glyph_advance(prev, c), 0, 0));
+
+		create_glyph_quad(j->second, bld);
+		prev = c;
+	}
+}
+
+void Font::create_glyph_quad(const Glyph &glyph, PrimitiveBuilder &bld) const
+{
+	bld.begin(TRIANGLE_STRIP);
+	bld.texcoord(glyph.x1, glyph.y2);
+	bld.vertex(glyph.off_x, glyph.off_y+glyph.h);
+	bld.texcoord(glyph.x1, glyph.y1);
+	bld.vertex(glyph.off_x, glyph.off_y);
+	bld.texcoord(glyph.x2, glyph.y2);
+	bld.vertex(glyph.off_x+glyph.w, glyph.off_y+glyph.h);
+	bld.texcoord(glyph.x2, glyph.y1);
+	bld.vertex(glyph.off_x+glyph.w, glyph.off_y);
+	bld.end();
+}
+
+float Font::get_glyph_advance(unsigned code, unsigned next) const
+{
+	GlyphMap::const_iterator i = glyphs.find(code);
+	if(i==glyphs.end())
+		return 0;
+
+	float advance = i->second.advance;
+
+	if(next)
+	{
+		KerningMap::const_iterator j = kerning.find(CodePair(code, next));
+		if(j!=kerning.end())
+			advance += j->second;
+	}
+
+	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::Glyph::Glyph():
+	code(0),
+	x1(0),
+	y1(0),
+	x2(1),
+	y2(1),
+	w(1),
+	h(1),
+	off_x(0),
+	off_y(0),
+	advance(1)
+{ }
+
+
+Font::Loader::Loader(Font &f):
+	DataFile::CollectionObjectLoader<Font>(f, 0)
+{
+	init();
+}
+
+Font::Loader::Loader(Font &f, Collection &c):
+	DataFile::CollectionObjectLoader<Font>(f, &c)
+{
+	init();
+}
+
+void Font::Loader::init()
+{
+	add("native_size", &Font::native_size);
+	add("ascent",      &Font::ascent);
+	add("cap_height",  &Font::cap_height);
+	add("descent",     &Font::descent);
+	add("texture",     &Loader::texture);
+	add("texture",     &Loader::texture_ref);
+	add("glyph",       &Loader::glyph);
+	add("kerning",     &Loader::kerning);
+	add("ligature",    &Loader::ligature);
+	add("x_height",    &Font::x_height);
+}
+
+void Font::Loader::glyph(unsigned c)
+{
+	Glyph gl;
+	gl.code = c;
+	load_sub(gl);
+	obj.glyphs.insert(GlyphMap::value_type(c, gl));
+}
+
+void Font::Loader::kerning(unsigned l, unsigned r, float 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()
+{
+	RefPtr<Texture2D> tex = new Texture2D;
+	load_sub(*tex);
+	obj.texture = tex;
+}
+
+void Font::Loader::texture_ref(const string &name)
+{
+	obj.texture = &get_collection().get<Texture2D>(name);
+	obj.texture.keep();
+}
+
+
+Font::Glyph::Loader::Loader(Glyph &g):
+	DataFile::ObjectLoader<Glyph>(g)
+{
+	add("texcoords", &Loader::texcoords);
+	add("size",      &Glyph::w,     &Glyph::h);
+	add("offset",    &Glyph::off_x, &Glyph::off_y);
+	add("advance",   &Glyph::advance);
+}
+
+void Font::Glyph::Loader::texcoords(float x1_, float y1_, float x2_, float y2_)
+{
+	obj.x1 = x1_;
+	obj.y1 = y1_;
+	obj.x2 = x2_;
+	obj.y2 = y2_;
+}
+
+} // namespace GL
+} // namespace Msp