/elec/propeller-clock

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bzr branch http://bzr.ed.am/elec/propeller-clock
59 by edam
removed ulibc, fixed button, added text rendering
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/*
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 * text_renderer.h
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 *
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 * Copyright (C) 2011 Tim Marston <tim@ed.am> and Dan Marston.
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 *
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 * This file is part of propeller-clock (hereafter referred to as "this
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 * program"). See http://ed.am/dev/software/arduino/propeller-clock for more
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 * information.
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU Lesser General Public License as published
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 * by the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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#ifndef _TEXT_RENDERER_H_
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#define _TEXT_RENDERER_H_
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#include <PString.h>
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#define MAX_MESSAGE_LENGTH 64
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class TextRenderer
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{
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public:
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	/**
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	 * Get singleton instance of text renderer.
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	 *
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	 * @return singleton instance
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	 */
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	static TextRenderer &get_instance();
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	/**
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	 * Retrieve the PString that is used to render text with the intention of
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	 * changing it. This resets the text services.
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	 *
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	 * @param message the message
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	 */
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	PString &get_pstring();
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	/**
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	 * Call at the start of each frame.
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	 */
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	void draw_reset();
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	/**
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	 * Draw segment using automatic scrolling.
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	 */
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	void draw_scroll( int segment );
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protected:
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	TextRenderer();
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	/**
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	 * Transform segment in to display-space.
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	 *
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	 * @param segment
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	 * @return display-space segment
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	 */
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	int xform_segment( int segment );
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	/**
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	 * Draw the specified column of pixels from the message
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	 *
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	 * @param x pixel column to draw
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	 */
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	void render( int x );
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	/**
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	 * Get a pointer to the character data in the font for a given
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	 * character.
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	 *
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	 * @param character to look-up
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	 * @param glyph where to store the glyph data
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	 */
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	void get_glyph( char c, char *glyph );
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	/** the buffer for the message */
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	char _message_buffer[ MAX_MESSAGE_LENGTH ];
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	/** the current message */
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	PString _message;
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	/** glyph */
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	char _glyph_cache[ 8 ];
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	/** the character the current glyph is for */
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	char _glyph_cache_char;
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	/** selected font */
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	int _font;
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	/** time last frame */
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	unsigned long _last_millis;
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	/** duration last frame (in case we can't calculate it this
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	 * frame!) */
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	unsigned long _duration;
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	/** scroll position (in segments ) */
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	signed long _scroll;
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};
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#endif //_TEXT_RENDERER_H_