forked from KolibriOS/kolibrios
121 lines
4.1 KiB
C
121 lines
4.1 KiB
C
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/*
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SDL_bdf - renders BDF fonts
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Copyright (C) 2002-2003 Andre de Leiradella
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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For information about SDL_bdf contact leiradella@bigfoot.com
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Version 1.0: first public release.
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Version 1.1: removed SDL dependecies, now SDL_bdf can be used with any graphics
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library.
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Version 1.2: fixed BDF_SizeH and BDF_SizeEntitiesH to return the correct sizes.
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*/
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#ifndef __SDL_bdf_h__
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#define __SDL_bdf_h__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Error codes. */
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/* No error. */
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#define BDF_OK 0
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/* Not enough memory reading BDF font. */
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#define BDF_MEMORYERROR 1
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/* Error reading BDF font. */
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#define BDF_READERROR 2
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/* Can only handle BDF font varsions up to 2.2. */
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#define BDF_WRONGVERSION 3
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/* Can only handle horizontal BDF fonts. */
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#define BDF_CANNOTHANDLEVERTICAL 4
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/* Character found past end of BDF font. */
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#define BDF_TOOMANYCHARACTERS 5
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/* BDF font is missing characters. */
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#define BDF_TOOFEWCHARACTERS 6
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/* Error parsing BDF font. */
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#define BDF_PARSEERROR 7
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/* A BDF character. */
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typedef struct {
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char *name;
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int code;
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int dwx0, dwy0;
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int dwx1, dwy1;
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int bbw, bbh, bbxoff0x, bbyoff0y, wbytes;
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unsigned char *bits;
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} BDF_Char;
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/* A BDF font. */
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typedef struct {
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int metricsSet, numChars;
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BDF_Char *chars;
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BDF_Char *code[256];
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} BDF_Font;
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/*
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Function to put a pixel on the surface, it receives a pointer to the surface
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(whatever format it may be), the x and y coordinates and the color.
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*/
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typedef void (*BDF_PutPixel)(void *, int, int, unsigned int);
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/*
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Function to read a byte, it receives an user defined void pointer and must
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return a value in the range [0..255] or -1 to indicate EOF.
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*/
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typedef int (*BDF_ReadByte)(void *);
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/*
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Opens a BDF font, it receives the function that will produce the stream of
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bytes, the user defined void pointer that will be passed to getbyte and a
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pointer to an int that will receive the error code. Returns the BDF font.
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*/
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extern BDF_Font *BDF_OpenFont(BDF_ReadByte getbyte, void *info, int *error);
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/*
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Closes the font and frees all associated memory.
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*/
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extern void BDF_CloseFont(BDF_Font *font);
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/*
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Determines the size of the horizontal text, returns the width and height of the
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smallest rectangle that can acomodate the rendered text and the start position
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in x0 and y0 on where the text must be rendered to exactly fit the rectangle.
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This is because the render functions take the y parameter as the baseline of
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the text to allow different fonts (e.g. normal and italic) to be mixed in the
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same line. It handles NULL pointers for pieces of information you don't want.
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*/
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extern void BDF_SizeH(BDF_Font *font, char *text, int *x0, int *y0, int *width, int *height);
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/*
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Same as above but accepts entities in the form &...;
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*/
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extern void BDF_SizeEntitiesH(BDF_Font *font, char *text, int *x0, int *y0, int *width, int *height);
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/*
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Draws the text at the given surface starting at position (x, y). It calls
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putpixel with the surface, coordinates and color to draw the pixel (doesn't
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clip). Returns the next x coordinate to continue to render more text. Only
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accepts characters in the range [0..255].
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*/
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extern int BDF_DrawH(void *surface, BDF_PutPixel putpixel, BDF_Font *font, char *text, int x, int y, unsigned int color);
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/*
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Same as above but accepts entities in the form &...;
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*/
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extern int BDF_DrawEntitiesH(void *, BDF_PutPixel, BDF_Font *, char *, int, int, unsigned int);
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#ifdef __cplusplus
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};
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#endif
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#endif
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