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BMF_Api.h

/**
 * $Id: BMF_Api.h 14444 2008-04-16 22:40:48Z hos $
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/**

 * $Id: BMF_Api.h 14444 2008-04-16 22:40:48Z hos $
 * Copyright (C) 2001 NaN Technologies B.V.
 *
 * API of the OpenGL bitmap font library.
 * Currently draws fonts using the glBitmap routine.
 * This implies that drawing speed is heavyly dependant on
 * the 2D capabilities of the graphics card.
 */

#ifndef __BMF_API_H
#define __BMF_API_H

#ifdef __cplusplus
extern "C" { 
#endif

#include "BMF_Fonts.h"

/**
 * Returns the font for a given font type.
 * @param font    The font to retrieve.
 * @return The font (or nil if not found).
 */
BMF_Font* BMF_GetFont(BMF_FontType font);

/**
 * Draws a character at the current raster position.
 * @param font    The font to use.
 * @param c       The character to draw.
 * @return Indication of success (0 == error).
 */
int BMF_DrawCharacter(BMF_Font* font, char c);

/**
 * Draws a string at the current raster position.
 * @param font    The font to use.
 * @param str     The string to draw.
 * @return Indication of success (0 == error).
 */
int BMF_DrawString(BMF_Font* font, char* str);

/**
 * Returns the width of a character in pixels.
 * @param font    The font to use.
 * @param c       The character.
 * @return The length.
 */
int BMF_GetCharacterWidth(BMF_Font* font, char c);

/**
 * Returns the width of a string of characters.
 * @param font    The font to use.
 * @param str     The string.
 * @return The length.
 */
int BMF_GetStringWidth(BMF_Font* font, char* str);

/**
 * Returns the bounding box of a string of characters.
 * @param font    The font to use.
 * @param str     The string.
 * @param llx   Lower left x coord
 * @param lly   Lower left y coord
 * @param urx   Upper right x coord
 * @param ury   Upper right y coord
 */
void BMF_GetStringBoundingBox(BMF_Font* font, char* str, float*llx, float *lly, float *urx, float *ury);


/**
 * Returns the bounding box of the font. The width and
 * height represent the bounding box of the union of
 * all glyps. The minimum and maximum values of the
 * box represent the extent of the font and its positioning
 * about the origin.
 */
void BMF_GetFontBoundingBox(BMF_Font* font, int *xmin_r, int *ymin_r, int *xmax_r, int *ymax_r);

/**
 * Same as GetFontBoundingBox but only returns the height
 */
int BMF_GetFontHeight(BMF_Font* font);

/**
 * Convert the given @a font to a texture, and return the GL texture
 * ID of the texture. If the texture ID is bound, text can
 * be drawn using the texture by calling DrawStringTexture.
 * 
 * @param font The font to create the texture from.
 * @return The GL texture ID of the new texture, or -1 if unable
 * to create.
 */
int BMF_GetFontTexture(BMF_Font* font);

/**
 * Draw the given @a str at the point @a x, @a y, @a z, using
 * texture coordinates. This assumes that an appropriate texture
 * has been bound, see BMF_BitmapFont::GetTexture(). The string
 * is drawn along the positive X axis.
 * 
 * @param font The font to draw with.
 * @param string The c-string to draw.
 * @param x The x coordinate to start drawing at.
 * @param y The y coordinate to start drawing at.
 * @param z The z coordinate to start drawing at.
 */
void BMF_DrawStringTexture(BMF_Font* font, char* string, float x, float y, float z);

      /**
 * Draw the given @a string at the point @a xpos, @a ypos using
 * char and float buffers.
 * 
 * @param string The c-string to draw.
 * @param xpos The x coordinate to start drawing at.
 * @param ypos The y coordinate to start drawing at.
 * @param fgcol The forground color.
 * @param bgcol The background color.
 * @param buf Unsigned char image buffer, when NULL to not operate on it.
 * @param fbuf float image buffer, when NULL to not operate on it.
 * @param w image buffer width.
 * @param h image buffer height.
 * @param channels number of channels in the image (3 or 4 - currently)
       */
void BMF_DrawStringBuf(BMF_Font* font, char *str, int posx, int posy, float *col, unsigned char *buf, float *fbuf, int w, int h, int channels);


#ifdef __cplusplus
}
#endif

#endif /* __BMF_API_H */


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