SFont.c

   1 /*
   2  * Copyright (C) Karl Bartel <karlb@gmx.net> WWW: http://www.linux-games.com
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /*Modified 2003, 2006 by Andre Noll */
   8
   9 #include <SDL/SDL.h>
  10 #include "SFont.h"
  11 #include <stdlib.h> /* exit */
  12 #include <string.h> /* strlen */
  13 SFont_FontInfo InternalFont;
  14
  15 static Uint32 GetPixel(SDL_Surface *Surface, Sint32 X, Sint32 Y)
  16 {
  17
  18         Uint8 *bits;
  19         Uint32 Bpp;
  20
  21         if (X < 0)
  22                 puts("SFONT ERROR: x too small in GetPixel. Report this "
  23                         "to <karlb@gmx.net>");
  24         if (X >= Surface->w)
  25                 puts("SFONT ERROR: x too big in GetPixel. Report this to "
  26                         "<karlb@gmx.net>");
  27         Bpp = Surface->format->BytesPerPixel;
  28         bits = ((Uint8 *) Surface->pixels) + Y * Surface->pitch + X * Bpp;
  29
  30         /* Get the pixel */
  31         switch (Bpp) {
  32         case 1:
  33                 return *((Uint8 *) Surface->pixels + Y * Surface->pitch + X);
  34                 break;
  35         case 2:
  36                 return *((Uint16 *) Surface->pixels + Y * Surface->pitch / 2 + X);
  37                 break;
  38         case 3:{        /* Format/endian independent  */
  39                         Uint8 r, g, b;
  40                         r = *((bits) + Surface->format->Rshift / 8);
  41                         g = *((bits) + Surface->format->Gshift / 8);
  42                         b = *((bits) + Surface->format->Bshift / 8);
  43                         return SDL_MapRGB(Surface->format, r, g, b);
  44                 }
  45                 break;
  46         case 4:
  47                 return *((Uint32 *) Surface->pixels + Y * Surface->pitch / 4 + X);
  48                 break;
  49         }
  50
  51         return -1;
  52 }
  53
  54 void InitFont2(SFont_FontInfo * Font)
  55 {
  56         int x = 0, i = 0;
  57
  58         if (!Font->Surface) {
  59                 printf("The font has not been loaded!\n");
  60                 exit(EXIT_FAILURE);
  61         }
  62
  63         if (SDL_MUSTLOCK(Font->Surface))
  64                 SDL_LockSurface(Font->Surface);
  65
  66         while (x < Font->Surface->w) {
  67                 if (GetPixel(Font->Surface, x, 0) ==
  68                         SDL_MapRGB(Font->Surface->format, 255, 0, 255)) {
  69                         Font->CharPos[i++] = x;
  70                         while ((x < Font->Surface->w - 1) &&
  71                                 (GetPixel(Font->Surface, x, 0) ==
  72                                 SDL_MapRGB(Font->Surface->format, 255, 0, 255)))
  73                                 x++;
  74                         Font->CharPos[i++] = x;
  75                 }
  76                 x++;
  77         }
  78         if (SDL_MUSTLOCK(Font->Surface))
  79                 SDL_UnlockSurface(Font->Surface);
  80
  81         Font->h = Font->Surface->h;
  82         SDL_SetColorKey(Font->Surface, SDL_SRCCOLORKEY,
  83                         GetPixel(Font->Surface, 0, Font->Surface->h - 1));
  84 }
  85
  86 void PutString2(SDL_Surface * Surface, SFont_FontInfo * Font, int x, int y,
  87                 const char *text)
  88 {
  89         int ofs;
  90         int i = 0;
  91         SDL_Rect srcrect, dstrect;
  92
  93         while (text[i] != '\0') {
  94                 if (text[i] == ' ') {
  95                         x += Font->CharPos[2] - Font->CharPos[1];
  96                         i++;
  97                 } else {
  98                         ofs = ((unsigned char) text[i] - 33) * 2 + 1;
  99                         srcrect.w = dstrect.w = (Font->CharPos[ofs + 2]
 100                                 + Font->CharPos[ofs + 1]) / 2
 101                                 - (Font->CharPos[ofs]
 102                                 + Font->CharPos[ofs - 1]) / 2;
 103                         srcrect.h = dstrect.h = Font->Surface->h - 1;
 104                         srcrect.x = (Font->CharPos[ofs]
 105                                 + Font->CharPos[ofs - 1]) / 2;
 106                         srcrect.y = 1;
 107                         dstrect.x = x - (float) (Font->CharPos[ofs]
 108                                 - Font->CharPos[ofs - 1]) / 2;
 109                         dstrect.y = y;
 110                         SDL_BlitSurface(Font->Surface, &srcrect, Surface,
 111                                         &dstrect);
 112                         x += Font->CharPos[ofs + 1] - Font->CharPos[ofs];
 113                         i++;
 114                 }
 115         }
 116 }
 117
 118 int TextWidth2(SFont_FontInfo * Font, char *text)
 119 {
 120         int ofs = 0;
 121         int i = 0, x = 0;
 122
 123         while (text[i] != '\0') {
 124                 if (text[i] == ' ') {
 125                         x += Font->CharPos[2] - Font->CharPos[1];
 126                         i++;
 127                 } else {
 128                         ofs = ((unsigned char) text[i] - 33) * 2 + 1;
 129                         x += Font->CharPos[ofs + 1] - Font->CharPos[ofs];
 130                         i++;
 131                 }
 132         }
 133         return x;
 134 }
 135
 136 static void SFont_InternalInput(SDL_Surface * Dest, SFont_FontInfo * Font, int x,
 137                 int y, int PixelWidth, char *text)
 138 {
 139         SDL_Event event;
 140         int ch = -1, blink = 0;
 141         long blinktimer = 0;
 142         SDL_Surface *Back;
 143         SDL_Rect rect;
 144         int previous;
 145
 146         Back = SDL_AllocSurface(Dest->flags,
 147                 Dest->w,
 148                 Font->h,
 149                 Dest->format->BitsPerPixel,
 150                 Dest->format->Rmask,
 151                 Dest->format->Gmask, Dest->format->Bmask, 0);
 152         rect.x = 0;
 153         rect.y = y;
 154         rect.w = Dest->w;
 155         rect.h = Font->Surface->h;
 156         SDL_BlitSurface(Dest, &rect, Back, NULL);
 157         PutString2(Dest, Font, x, y, text);
 158         SDL_UpdateRects(Dest, 1, &rect);
 159
 160         /* start input */
 161         previous = SDL_EnableUNICODE(1);
 162         blinktimer = SDL_GetTicks();
 163         while (ch != SDLK_RETURN) {
 164                 if (event.type == SDL_KEYDOWN) {
 165                         ch = event.key.keysym.unicode;
 166                         if (((ch > 31) || (ch == '\b')) && (ch < 128)) {
 167                                 if ((ch == '\b') && (strlen(text) > 0))
 168                                         text[strlen(text) - 1] = '\0';
 169                                 else if (ch != '\b')
 170                                         sprintf(text, "%s%c", text, ch);
 171                                 if (TextWidth2(Font, text) > PixelWidth)
 172                                         text[strlen(text) - 1] = '\0';
 173                                 SDL_BlitSurface(Back, NULL, Dest, &rect);
 174                                 PutString2(Dest, Font, x, y, text);
 175                                 SDL_UpdateRects(Dest, 1, &rect);
 176                                 SDL_WaitEvent(&event);
 177                         }
 178                 }
 179                 if (SDL_GetTicks() > blinktimer) {
 180                         blink = 1 - blink;
 181                         blinktimer = SDL_GetTicks() + 500;
 182                         if (blink) {
 183                                 PutString2(Dest, Font,
 184                                         x + TextWidth2(Font, text), y, "|");
 185                                 SDL_UpdateRects(Dest, 1, &rect);
 186                         } else {
 187                                 SDL_BlitSurface(Back, NULL, Dest, &rect);
 188                                 PutString2(Dest, Font, x, y, text);
 189                                 SDL_UpdateRects(Dest, 1, &rect);
 190                         }
 191                 }
 192                 SDL_Delay(1);
 193                 SDL_PollEvent(&event);
 194         }
 195         text[strlen(text)] = '\0';
 196         SDL_FreeSurface(Back);
 197         /* restore the previous state */
 198         SDL_EnableUNICODE(previous);
 199 }
 200
 201 void SFont_Input2(SDL_Surface * Dest, SFont_FontInfo * Font, int x, int y,
 202                 int PixelWidth, char *text)
 203 {
 204         SFont_InternalInput(Dest, Font, x, y, PixelWidth, text);
 205 }