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/* SFont: a simple font-library that uses special .pngs as fonts
Copyright (C) 2003 Karl Bartel
License: GPL or LGPL (at your choice)
WWW: http://www.linux-games.com/sfont/
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
Karl Bartel
Cecilienstr. 14
12307 Berlin
GERMANY
karlb@gmx.net
*/
#include <SDL.h>
#include <assert.h>
#include <stdlib.h>
#include "SFont.h"
static long GetPixel(SDL_Surface *Surface, Sint32 X, Sint32 Y)
{
Uint8 *bits;
Uint32 Bpp;
assert(X>=0);
assert(X<Surface->w);
Bpp = Surface->format->BytesPerPixel;
bits = ((Uint8 *)Surface->pixels)+Y*Surface->pitch+X*Bpp;
// Get the pixel
switch(Bpp) {
case 1:
return *((Uint8 *)Surface->pixels + Y * Surface->pitch + X);
break;
case 2:
return *((Uint16 *)Surface->pixels + Y * Surface->pitch/2 + X);
break;
case 3: { // Format/endian independent
Uint8 r, g, b;
r = *((bits)+Surface->format->Rshift/8);
g = *((bits)+Surface->format->Gshift/8);
b = *((bits)+Surface->format->Bshift/8);
return SDL_MapRGB(Surface->format, r, g, b);
}
break;
case 4:
return *((Uint32 *)Surface->pixels + Y * Surface->pitch/4 + X);
break;
}
return -1;
}
SFont_Font* SFont_InitFont(SDL_Surface* Surface)
{
int x = 0, i = 0;
Uint32 pixel;
SFont_Font* Font;
Uint32 pink;
if (Surface == NULL)
return NULL;
Font = (SFont_Font *) malloc(sizeof(SFont_Font));
Font->Surface = Surface;
SDL_LockSurface(Surface);
pink = SDL_MapRGB(Surface->format, 255, 0, 255);
while (x < Surface->w) {
if (GetPixel(Surface, x, 0) == pink) {
Font->CharPos[i++]=x;
while((x < Surface->w) && (GetPixel(Surface, x, 0)== pink))
x++;
Font->CharPos[i++]=x;
}
x++;
}
Font->MaxPos = x-1;
pixel = GetPixel(Surface, 0, Surface->h-1);
SDL_UnlockSurface(Surface);
SDL_SetColorKey(Surface, SDL_SRCCOLORKEY, pixel);
return Font;
}
void SFont_FreeFont(SFont_Font* FontInfo)
{
SDL_FreeSurface(FontInfo->Surface);
free(FontInfo);
}
void SFont_Write(SDL_Surface *Surface, const SFont_Font *Font,
int x, int y, const char *text)
{
const char* c;
int charoffset;
SDL_Rect srcrect, dstrect;
if(text == NULL)
return;
// these values won't change in the loop
srcrect.y = 1;
dstrect.y = y;
srcrect.h = dstrect.h = Font->Surface->h - 1;
for(c = text; *c != '\0' && x <= Surface->w ; c++) {
charoffset = ((int) (*c - 33)) * 2 + 1;
// skip spaces and nonprintable characters
if (*c == ' ' || charoffset < 0 || charoffset > Font->MaxPos) {
x += Font->CharPos[2]-Font->CharPos[1];
continue;
}
srcrect.w = dstrect.w =
(Font->CharPos[charoffset+2] + Font->CharPos[charoffset+1])/2 -
(Font->CharPos[charoffset] + Font->CharPos[charoffset-1])/2;
srcrect.x = (Font->CharPos[charoffset]+Font->CharPos[charoffset-1])/2;
dstrect.x = x - (int)(Font->CharPos[charoffset]
- Font->CharPos[charoffset-1])/2;
SDL_BlitSurface(Font->Surface, &srcrect, Surface, &dstrect);
x += Font->CharPos[charoffset+1] - Font->CharPos[charoffset];
}
}
int SFont_TextWidth(const SFont_Font *Font, const char *text)
{
const char* c;
int charoffset=0;
int width = 0;
if(text == NULL)
return 0;
for(c = text; *c != '\0'; c++) {
charoffset = ((int) *c - 33) * 2 + 1;
// skip spaces and nonprintable characters
if (*c == ' ' || charoffset < 0 || charoffset > Font->MaxPos) {
width += Font->CharPos[2]-Font->CharPos[1];
continue;
}
width += Font->CharPos[charoffset+1] - Font->CharPos[charoffset];
}
return width;
}
int SFont_TextHeight(const SFont_Font* Font)
{
return Font->Surface->h - 1;
}
void SFont_WriteCenter(SDL_Surface *Surface, const SFont_Font *Font,
int y, const char *text)
{
SFont_Write(Surface, Font, Surface->w/2 - SFont_TextWidth(Font, text)/2,
y, text);
}
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