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include/framework/font/font_renderer.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__FONTRENDERER__
+#define	__FONTRENDERER__
+
+
+		#include "font/font_extended.h"
+		#include "font/font_cache.h"
+		#include "math/vector.h"
+
+
+namespace GS {
+	class Picture;
+	struct SubString;
+
+/// Text widget state structure.
+class	TextState
+{
+		int			size;
+		float		tracking,			///< Text tracking (horizontal offset between two characters).
+					leading;			///< Text heading (vertical offset between lines).
+
+public:
+
+enum	Format
+{
+		Line = 0,
+		Paragraph,
+		Column
+};
+
+enum	Alignment
+{
+		Left = 0,
+		Right,
+		Center,
+		Justify
+};
+
+		sFontEx		font;
+		Color		color;
+
+		Format		format;				///< Text format.
+		Alignment	alignment;			///< Text alignment.
+		int			column_width;		///< Text column width.
+
+		int			GetSize() const { return font.IsValid() ? (int)(size * font->size_multiplier) : size; }
+		float		GetTracking() const { return font.IsValid() ? tracking + font->tracking_offset : tracking; }
+		float		GetLeading() const { return font.IsValid() ? leading + font->leading_offset : leading; }
+
+		void		SetSize(int s) { size = s; }
+		void		SetTracking(float t) { tracking = t; }
+		void		SetLeading(float l) { leading = l; }
+
+		TextState()
+		{
+			size = 16;
+			color = Color::Black;
+
+			format = Line;
+			alignment = Left;
+
+			column_width = 80;
+			tracking = 0;
+			leading = 0;
+		}
+};
+
+/*
+	@short	Font renderer.
+	@author	Emmanuel Julien (ejulien@nworks.fr)
+*/
+class	FontRenderer
+{
+public:
+
+enum	CommandCode
+{
+		CommandNone = 0,
+		CommandColor,
+		CommandFont,
+		CommandSize,
+
+		CommandParseError
+};
+
+static	float		default_text_tracking;
+static	float		default_text_heading;
+
+/// Renderer command.
+struct	Command
+{
+		CommandCode	code;
+		Vector4		vector;
+		sIFont		font;
+};
+
+protected:
+
+		/// Check current string for a command.
+static	const char	*CheckCommand(const char *string, Command &command);
+		/// Get the next sub-string from the current text buffer.
+static	const char	*FetchSubString(const char *string, SubString &sstr, TextState &state, int max_width, int max_character);
+		/// Draw a substring to a picture.
+static	void		DrawSubString(SubString &sub_string, Picture &output, TextState &state, const iRect &out_rect, const iRect &clip_rect, int justification);
+
+public:
+
+		/// Format a string using a text state, return the required output rectangle.
+static	iRect		Format(const char *text, const TextState &in_state, const iRect &out_rect);
+		/// Compose a string using a text state.
+static	iRect		Compose(Picture &output, const char *text, const TextState &state, const iRect &out_rect, const iRect &clip_rect);
+};
+
+} // GS
+
+
+#endif	// __FONTRENDERER__