SFont.c

   1 /*
   2  * Copyright (C) Karl Bartel <karlb@gmx.net> WWW: http://www.linux-games.com
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /*Modified 2003, 2006 by Andre Noll */
  20
  21 #include <SDL/SDL.h>
  22 #include "SFont.h"
  23 #include <stdlib.h> /* exit */
  24 #include <string.h> /* strlen */
  25 SFont_FontInfo InternalFont;
  26
  27 Uint32 GetPixel(SDL_Surface * Surface, Sint32 X, Sint32 Y)
  28 {
  29
  30         Uint8 *bits;
  31         Uint32 Bpp;
  32
  33         if (X < 0)
  34                 puts("SFONT ERROR: x too small in GetPixel. Report this "
  35                         "to <karlb@gmx.net>");
  36         if (X >= Surface->w)
  37                 puts("SFONT ERROR: x too big in GetPixel. Report this to "
  38                         "<karlb@gmx.net>");
  39         Bpp = Surface->format->BytesPerPixel;
  40         bits = ((Uint8 *) Surface->pixels) + Y * Surface->pitch + X * Bpp;
  41
  42         /* Get the pixel */
  43         switch (Bpp) {
  44         case 1:
  45                 return *((Uint8 *) Surface->pixels + Y * Surface->pitch + X);
  46                 break;
  47         case 2:
  48                 return *((Uint16 *) Surface->pixels + Y * Surface->pitch / 2 +
  49                          X);
  50                 break;
  51         case 3:{        /* Format/endian independent  */
  52                         Uint8 r, g, b;
  53                         r = *((bits) + Surface->format->Rshift / 8);
  54                         g = *((bits) + Surface->format->Gshift / 8);
  55                         b = *((bits) + Surface->format->Bshift / 8);
  56                         return SDL_MapRGB(Surface->format, r, g, b);
  57                 }
  58                 break;
  59         case 4:
  60                 return *((Uint32 *) Surface->pixels + Y * Surface->pitch / 4 +
  61                          X);
  62                 break;
  63         }
  64
  65         return -1;
  66 }
  67
  68 void InitFont2(SFont_FontInfo * Font)
  69 {
  70         int x = 0, i = 0;
  71
  72         if (!Font->Surface) {
  73                 printf("The font has not been loaded!\n");
  74                 exit(EXIT_FAILURE);
  75         }
  76
  77         if (SDL_MUSTLOCK(Font->Surface))
  78                 SDL_LockSurface(Font->Surface);
  79
  80         while (x < Font->Surface->w) {
  81                 if (GetPixel(Font->Surface, x, 0) ==
  82                     SDL_MapRGB(Font->Surface->format, 255, 0, 255)) {
  83                         Font->CharPos[i++] = x;
  84                         while ((x < Font->Surface->w - 1)
  85                                && (GetPixel(Font->Surface, x, 0) ==
  86                                    SDL_MapRGB(Font->Surface->format, 255, 0,
  87                                               255)))
  88                                 x++;
  89                         Font->CharPos[i++] = x;
  90                 }
  91                 x++;
  92         }
  93         if (SDL_MUSTLOCK(Font->Surface))
  94                 SDL_UnlockSurface(Font->Surface);
  95
  96         Font->h = Font->Surface->h;
  97         SDL_SetColorKey(Font->Surface, SDL_SRCCOLORKEY,
  98                         GetPixel(Font->Surface, 0, Font->Surface->h - 1));
  99 }
 100
 101 #if 0
 102 void InitFont(SDL_Surface * Font)
 103 {
 104         InternalFont.Surface = Font;
 105         InitFont2(&InternalFont);
 106 }
 107
 108 #endif
 109
 110
 111
 112 void PutString2(SDL_Surface * Surface, SFont_FontInfo * Font, int x, int y,
 113                 const char *text)
 114 {
 115         int ofs;
 116         int i = 0;
 117         SDL_Rect srcrect, dstrect;
 118
 119         while (text[i] != '\0') {
 120                 if (text[i] == ' ') {
 121                         x += Font->CharPos[2] - Font->CharPos[1];
 122                         i++;
 123                 } else {
 124                         ofs = ((unsigned char) text[i] - 33) * 2 + 1;
 125                         srcrect.w = dstrect.w = (Font->CharPos[ofs + 2]
 126                                 + Font->CharPos[ofs + 1]) / 2
 127                                 - (Font->CharPos[ofs] + Font->CharPos[ofs - 1])
 128                                          / 2;
 129                         srcrect.h = dstrect.h = Font->Surface->h - 1;
 130                         srcrect.x =
 131                             (Font->CharPos[ofs] + Font->CharPos[ofs - 1]) / 2;
 132                         srcrect.y = 1;
 133                         dstrect.x =
 134                             x - (float) (Font->CharPos[ofs] -
 135                                          Font->CharPos[ofs - 1]) / 2;
 136                         dstrect.y = y;
 137                         SDL_BlitSurface(Font->Surface, &srcrect, Surface,
 138                                         &dstrect);
 139                         x += Font->CharPos[ofs + 1] - Font->CharPos[ofs];
 140                         i++;
 141                 }
 142         }
 143 }
 144
 145 int TextWidth2(SFont_FontInfo * Font, char *text)
 146 {
 147         int ofs = 0;
 148         int i = 0, x = 0;
 149
 150         while (text[i] != '\0') {
 151                 if (text[i] == ' ') {
 152                         x += Font->CharPos[2] - Font->CharPos[1];
 153                         i++;
 154                 } else {
 155                         ofs = ((unsigned char) text[i] - 33) * 2 + 1;
 156                         x += Font->CharPos[ofs + 1] - Font->CharPos[ofs];
 157                         i++;
 158                 }
 159         }
 160         return x;
 161 }
 162
 163 void SFont_InternalInput(SDL_Surface * Dest, SFont_FontInfo * Font, int x,
 164                 int y, int PixelWidth, char *text)
 165 {
 166         SDL_Event event;
 167         int ch = -1, blink = 0;
 168         long blinktimer = 0;
 169         SDL_Surface *Back;
 170         SDL_Rect rect;
 171         int previous;
 172
 173         Back = SDL_AllocSurface(Dest->flags,
 174                 Dest->w,
 175                 Font->h,
 176                 Dest->format->BitsPerPixel,
 177                 Dest->format->Rmask,
 178                 Dest->format->Gmask, Dest->format->Bmask, 0);
 179         rect.x = 0;
 180         rect.y = y;
 181         rect.w = Dest->w;
 182         rect.h = Font->Surface->h;
 183         SDL_BlitSurface(Dest, &rect, Back, NULL);
 184         PutString2(Dest, Font, x, y, text);
 185         SDL_UpdateRects(Dest, 1, &rect);
 186
 187         /* start input */
 188         previous = SDL_EnableUNICODE(1);
 189         blinktimer = SDL_GetTicks();
 190         while (ch != SDLK_RETURN) {
 191                 if (event.type == SDL_KEYDOWN) {
 192                         ch = event.key.keysym.unicode;
 193                         if (((ch > 31) || (ch == '\b')) && (ch < 128)) {
 194                                 if ((ch == '\b') && (strlen(text) > 0))
 195                                         text[strlen(text) - 1] = '\0';
 196                                 else if (ch != '\b')
 197                                         sprintf(text, "%s%c", text, ch);
 198                                 if (TextWidth2(Font, text) > PixelWidth)
 199                                         text[strlen(text) - 1] = '\0';
 200                                 SDL_BlitSurface(Back, NULL, Dest, &rect);
 201                                 PutString2(Dest, Font, x, y, text);
 202                                 SDL_UpdateRects(Dest, 1, &rect);
 203                                 SDL_WaitEvent(&event);
 204                         }
 205                 }
 206                 if (SDL_GetTicks() > blinktimer) {
 207                         blink = 1 - blink;
 208                         blinktimer = SDL_GetTicks() + 500;
 209                         if (blink) {
 210                                 PutString2(Dest, Font,
 211                                            x + TextWidth2(Font, text), y, "|");
 212                                 SDL_UpdateRects(Dest, 1, &rect);
 213                         } else {
 214                                 SDL_BlitSurface(Back, NULL, Dest, &rect);
 215                                 PutString2(Dest, Font, x, y, text);
 216                                 SDL_UpdateRects(Dest, 1, &rect);
 217                         }
 218                 }
 219                 SDL_Delay(1);
 220                 SDL_PollEvent(&event);
 221         }
 222         text[strlen(text)] = '\0';
 223         SDL_FreeSurface(Back);
 224         /* restore the previous state */
 225         SDL_EnableUNICODE(previous);
 226 }
 227
 228 void SFont_Input2(SDL_Surface * Dest, SFont_FontInfo * Font, int x, int y,
 229                   int PixelWidth, char *text)
 230 {
 231         SFont_InternalInput(Dest, Font, x, y, PixelWidth, text);
 232 }