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font.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2004 The ScummVM project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/graphics/font.h,v 1.2 2004/08/15 14:05:28 fingolfin Exp $
 */

#ifndef FONT_H
#define FONT_H

#include "common/str.h"
#include "graphics/surface.h"

namespace Graphics {

// Text alignment modes for drawString()
enum TextAlignment {
      kTextAlignLeft,
      kTextAlignCenter,
      kTextAlignRight
};

/**
 * Instances of this class represent a distinct font, with a built-in renderer.
 * @todo Maybe move the high-level methods (drawString etc.) to a separate 
 *       FontRenderer class? That way, we could have different variants... ?
 * @todo Add more parameters to drawString, or additional similar methods,
 *       featuring abilities like
 *       - rendering with wrap-around instead of inserting an ellipsis or
 *         cutting them; needs a 'height' parameter
 *       - rendering multi-line strings (essentially, invoke the regular
 *         drawString for each line, and advance one line)
 *       - combinations of the two above: honor line feeds, and also wrap
 *         overlong lines
 */
00049 class Font {
public:
      virtual int getFontHeight() const = 0;
      virtual int getMaxCharWidth() const = 0;

      virtual int getCharWidth(byte chr) const = 0;
      virtual void drawChar(const Surface *dst, byte chr, int x, int y, uint32 color) const = 0;

      void drawString(const Surface *dst, const Common::String &str, int x, int y, int w, uint32 color, TextAlignment align = kTextAlignLeft, int deltax = 0, bool useEllipsis = true) const;
      int getStringWidth(const Common::String &str) const;
};


class ScummFont : public Font {
public:
      virtual int getFontHeight() const { return 8; }
      virtual int getMaxCharWidth() const { return 8; };

      virtual int getCharWidth(byte chr) const;
      virtual void drawChar(const Surface *dst, byte chr, int x, int y, uint32 color) const;
};

extern const ScummFont g_scummfont;



typedef unsigned short bitmap_t; /* bitmap image unit size*/

/* builtin C-based proportional/fixed font structure */
/* based on The Microwindows Project http://microwindows.org */
struct FontDesc {
      const char *      name;       /* font name*/
      int         maxwidth;   /* max width in pixels*/
      int   height;           /* height in pixels*/
      int         ascent;           /* ascent (baseline) height*/
      int         firstchar;  /* first character in bitmap*/
      int         size;       /* font size in glyphs*/
      const bitmap_t*   bits;       /* 16-bit right-padded bitmap data*/
      const unsigned long* offset;  /* offsets into bitmap data*/
      const unsigned char* width;   /* character widths or NULL if fixed*/
      int         defaultchar;      /* default char (not glyph index)*/
      long  bits_size;  /* # words of bitmap_t bits*/
};

class NewFont : public Font {
protected:
      FontDesc desc;

public:
      NewFont(const FontDesc &d) : desc(d) {}
      
      virtual int getFontHeight() const { return desc.height; }
      virtual int getMaxCharWidth() const { return desc.maxwidth; };

      virtual int getCharWidth(byte chr) const;
      virtual void drawChar(const Surface *dst, byte chr, int x, int y, uint32 color) const;
};

extern const NewFont g_sysfont;

} // End of namespace Graphics

#endif

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