X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Ffont.h;h=4eaed9635361ecca51ae5604b84c3c0d533c1109;hp=6f8f35ff1db4be61fc52af060e1daade7ae73496;hb=20af6dd2f04caa224d8cae00befc97d010a1ed08;hpb=1ddd5b2a0c4ab104d90db427af0f24991fc40580

diff --git a/source/font.h b/source/font.h
index 6f8f35ff..4eaed963 100644
--- a/source/font.h
+++ b/source/font.h
@@ -13,6 +13,9 @@ namespace GL {
 class PrimitiveBuilder;
 class Texture2D;
 
+/**
+Stores a set of glyphs and creates strings out of them.
+*/
 class Font
 {
 public:
@@ -25,6 +28,7 @@ public:
 	private:
 		void init();
 		void glyph(unsigned);
+		void kerning(unsigned, unsigned, float);
 		void texture();
 		void texture_ref(const std::string &);
 	};
@@ -40,32 +44,50 @@ public:
 		};
 
 		unsigned code;
-		float x1,y1;
-		float x2,y2;
-		float w,h;
+		float x1, y1;
+		float x2, y2;
+		float w, h;
 		float off_x, off_y;
 		float advance;
 	};
 
 private:
 	typedef std::map<unsigned, Glyph> GlyphMap;
+	typedef std::pair<unsigned, unsigned> KerningKey;
+	typedef std::map<KerningKey, float> KerningMap;
 
 	RefPtr<const Texture2D> texture;
 	float native_size;
 	float ascent;
 	float descent;
+	float cap_height;
+	float x_height;
 	GlyphMap glyphs;
+	KerningMap kerning;
 
 public:
 	Font();
+	~Font();
 
 	void set_texture(const Texture2D &);
 	const Texture2D &get_texture() const;
+
+	/** Adds a glyph to the font.  There must not be an existing glyph with the
+	same code. */
 	void add_glyph(const Glyph &);
+	void set_kerning(unsigned, unsigned, float);
+
+	/** Returns the size used to generate the font texture.  This serves as a
+	hint for obtaining the best quality when rendering strings. */
 	float get_native_size() const { return native_size; }
+
 	float get_ascent() const { return ascent; }
 	float get_descent() const { return descent; }
+	float get_cap_height() const { return cap_height; }
+	float get_x_height() const { return x_height; }
 
+	/** Returns the width of a string, in multiples of the font size.  Scale the
+	result according to the size used in rendering. */
 	float get_string_width(const std::string &, StringCodec::Decoder &) const;
 
 	template<class C>
@@ -78,7 +100,8 @@ public:
 	float get_string_width(const std::string &str) const
 	{ return get_string_width<StringCodec::Utf8>(str); }
 
-	/// Draws a string to the framebuffer with Immediate.
+	/** Draws a string to the framebuffer with Immediate.  It is drawn with size
+	1.0; set up matrices for the desired size before the call. */
 	void draw_string(const std::string &, StringCodec::Decoder &, const Color & = Color()) const;
 
 	template<class C>
@@ -91,10 +114,10 @@ public:
 	void draw_string(const std::string &str, const Color &color = Color()) const
 	{ draw_string<StringCodec::Utf8>(str, color); }
 
-	/** Builds the primitives for a string.  The PrimitiveBuilder should be
-	associated with a target that has at least VERTEX2 and TEXCOORD2 components.
-	The texture is not bound, to avoid unnecessary bindings when creating
-	meshes. */
+	/** Builds the primitives for a string.  Two-dimensional vertex and texture
+	coordinates are generated.  Size 1.0 is used for building; set up the
+	builder's matrix before the call.  The texture is not bound, to avoid
+	unnecessary bindings when creating meshes. */
 	void build_string(const std::string &, StringCodec::Decoder &, PrimitiveBuilder &) const;
 
 	template<class C>
@@ -108,8 +131,8 @@ public:
 	{ return build_string<StringCodec::Utf8>(str, pb); }
 
 private:
-	void create_glyph_vertices(const Glyph &, VertexBuilder &) const;
-	float get_glyph_advance(unsigned) const;
+	void create_glyph_quad(const Glyph &, PrimitiveBuilder &) const;
+	float get_glyph_advance(unsigned, unsigned = 0) const;
 };
 
 } // namespace GL