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gif_font.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber              IBM PC Ver 0.1,   Jun. 1989    *
******************************************************************************
* Utility font handling and simple drawing for the GIF library               *
******************************************************************************
* History:                                                 *
* 17 Jun 89 - Version 1.0 by Gershon Elber.                            *
* 25 Sep 92 - Draw functions added by Eric S. Raymond                  *
*****************************************************************************/

#include <string.h>
#include "gif_lib.h"

/*****************************************************************************
* Ascii 8 by 8 regular font - only first 128 characters are supported.       *
*****************************************************************************/
/*
 * Each array entry holds the bits for 8 horizontal scan lines, topmost
 * first.  The most significant bit of each constant is the leftmost bit of
 * the scan line.
 */
unsigned char AsciiTable[][GIF_FONT_WIDTH] = {
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* Ascii 0  */
    { 0x3c, 0x42, 0xa5, 0x81, 0xbd, 0x42, 0x3c, 0x00 }, /* Ascii 1  */
    { 0x3c, 0x7e, 0xdb, 0xff, 0xc3, 0x7e, 0x3c, 0x00 }, /* Ascii 2  */
    { 0x00, 0xee, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00 }, /* Ascii 3  */
    { 0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00 }, /* Ascii 4  */
    { 0x00, 0x3c, 0x18, 0xff, 0xff, 0x08, 0x18, 0x00 }, /* Ascii 5  */
    { 0x10, 0x38, 0x7c, 0xfe, 0xfe, 0x10, 0x38, 0x00 }, /* Ascii 6  */
    { 0x00, 0x00, 0x18, 0x3c, 0x18, 0x00, 0x00, 0x00 }, /* Ascii 7  */
    { 0xff, 0xff, 0xe7, 0xc3, 0xe7, 0xff, 0xff, 0xff }, /* Ascii 8  */
    { 0x00, 0x3c, 0x42, 0x81, 0x81, 0x42, 0x3c, 0x00 }, /* Ascii 9  */
    { 0xff, 0xc3, 0xbd, 0x7e, 0x7e, 0xbd, 0xc3, 0xff }, /* Ascii 10 */
    { 0x1f, 0x07, 0x0d, 0x7c, 0xc6, 0xc6, 0x7c, 0x00 }, /* Ascii 11 */
    { 0x00, 0x7e, 0xc3, 0xc3, 0x7e, 0x18, 0x7e, 0x18 }, /* Ascii 12 */
    { 0x04, 0x06, 0x07, 0x04, 0x04, 0xfc, 0xf8, 0x00 }, /* Ascii 13 */
    { 0x0c, 0x0a, 0x0d, 0x0b, 0xf9, 0xf9, 0x1f, 0x1f }, /* Ascii 14 */
    { 0x00, 0x92, 0x7c, 0x44, 0xc6, 0x7c, 0x92, 0x00 }, /* Ascii 15 */
    { 0x00, 0x00, 0x60, 0x78, 0x7e, 0x78, 0x60, 0x00 }, /* Ascii 16 */
    { 0x00, 0x00, 0x06, 0x1e, 0x7e, 0x1e, 0x06, 0x00 }, /* Ascii 17 */
    { 0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18 }, /* Ascii 18 */
    { 0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x00 }, /* Ascii 19 */
    { 0xff, 0xb6, 0x76, 0x36, 0x36, 0x36, 0x36, 0x00 }, /* Ascii 20 */
    { 0x7e, 0xc1, 0xdc, 0x22, 0x22, 0x1f, 0x83, 0x7e }, /* Ascii 21 */
    { 0x00, 0x00, 0x00, 0x7e, 0x7e, 0x00, 0x00, 0x00 }, /* Ascii 22 */
    { 0x18, 0x7e, 0x18, 0x18, 0x7e, 0x18, 0x00, 0xff }, /* Ascii 23 */
    { 0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00 }, /* Ascii 24 */
    { 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18, 0x00 }, /* Ascii 25 */
    { 0x00, 0x04, 0x06, 0xff, 0x06, 0x04, 0x00, 0x00 }, /* Ascii 26 */
    { 0x00, 0x20, 0x60, 0xff, 0x60, 0x20, 0x00, 0x00 }, /* Ascii 27 */
    { 0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xff, 0x00 }, /* Ascii 28 */
    { 0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00 }, /* Ascii 29 */
    { 0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x00, 0x00 }, /* Ascii 30 */
    { 0x00, 0x00, 0x00, 0xfe, 0x7c, 0x38, 0x10, 0x00 }, /* Ascii 31 */
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /*   */
    { 0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x30, 0x00 }, /* ! */
    { 0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* " */
    { 0x6c, 0x6c, 0xfe, 0x6c, 0xfe, 0x6c, 0x6c, 0x00 }, /* # */
    { 0x10, 0x7c, 0xd2, 0x7c, 0x86, 0x7c, 0x10, 0x00 }, /* $ */
    { 0xf0, 0x96, 0xfc, 0x18, 0x3e, 0x72, 0xde, 0x00 }, /* % */
    { 0x30, 0x48, 0x30, 0x78, 0xce, 0xcc, 0x78, 0x00 }, /* & */
    { 0x0c, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* ' */
    { 0x10, 0x60, 0xc0, 0xc0, 0xc0, 0x60, 0x10, 0x00 }, /* ( */
    { 0x10, 0x0c, 0x06, 0x06, 0x06, 0x0c, 0x10, 0x00 }, /* ) */
    { 0x00, 0x54, 0x38, 0xfe, 0x38, 0x54, 0x00, 0x00 }, /* * */
    { 0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00 }, /* + */
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x70 }, /* , */
    { 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00 }, /* - */
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00 }, /* . */
    { 0x02, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x00 }, /* / */
    { 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00 }, /* 0 */
    { 0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x3c, 0x00 }, /* 1 */
    { 0x7c, 0xc6, 0x06, 0x0c, 0x30, 0x60, 0xfe, 0x00 }, /* 2 */
    { 0x7c, 0xc6, 0x06, 0x3c, 0x06, 0xc6, 0x7c, 0x00 }, /* 3 */
    { 0x0e, 0x1e, 0x36, 0x66, 0xfe, 0x06, 0x06, 0x00 }, /* 4 */
    { 0xfe, 0xc0, 0xc0, 0xfc, 0x06, 0x06, 0xfc, 0x00 }, /* 5 */
    { 0x7c, 0xc6, 0xc0, 0xfc, 0xc6, 0xc6, 0x7c, 0x00 }, /* 6 */
    { 0xfe, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x60, 0x00 }, /* 7 */
    { 0x7c, 0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0x7c, 0x00 }, /* 8 */
    { 0x7c, 0xc6, 0xc6, 0x7e, 0x06, 0xc6, 0x7c, 0x00 }, /* 9 */
    { 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00 }, /* : */
    { 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x20, 0x00 }, /* }, */
    { 0x00, 0x1c, 0x30, 0x60, 0x30, 0x1c, 0x00, 0x00 }, /* < */
    { 0x00, 0x00, 0x7e, 0x00, 0x7e, 0x00, 0x00, 0x00 }, /* = */
    { 0x00, 0x70, 0x18, 0x0c, 0x18, 0x70, 0x00, 0x00 }, /* > */
    { 0x7c, 0xc6, 0x0c, 0x18, 0x30, 0x00, 0x30, 0x00 }, /* ? */
    { 0x7c, 0x82, 0x9a, 0xaa, 0xaa, 0x9e, 0x7c, 0x00 }, /* @ */
    { 0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0x00 }, /* A */
    { 0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xfc, 0x00 }, /* B */
    { 0x7c, 0xc6, 0xc6, 0xc0, 0xc0, 0xc6, 0x7c, 0x00 }, /* C */
    { 0xf8, 0xcc, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0x00 }, /* D */
    { 0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xfe, 0x00 }, /* E */
    { 0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0x00 }, /* F */
    { 0x7c, 0xc6, 0xc0, 0xce, 0xc6, 0xc6, 0x7e, 0x00 }, /* G */
    { 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0x00 }, /* H */
    { 0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00 }, /* I */
    { 0x1e, 0x06, 0x06, 0x06, 0xc6, 0xc6, 0x7c, 0x00 }, /* J */
    { 0xc6, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0xc6, 0x00 }, /* K */
    { 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0x00 }, /* L */
    { 0xc6, 0xee, 0xfe, 0xd6, 0xc6, 0xc6, 0xc6, 0x00 }, /* M */
    { 0xc6, 0xe6, 0xf6, 0xde, 0xce, 0xc6, 0xc6, 0x00 }, /* N */
    { 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00 }, /* O */
    { 0xfc, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0x00 }, /* P */
    { 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x06 }, /* Q */
    { 0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0x00 }, /* R */
    { 0x78, 0xcc, 0x60, 0x30, 0x18, 0xcc, 0x78, 0x00 }, /* S */
    { 0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00 }, /* T */
    { 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00 }, /* U */
    { 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00 }, /* V */
    { 0xc6, 0xc6, 0xc6, 0xd6, 0xfe, 0xee, 0xc6, 0x00 }, /* W */
    { 0xc6, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0xc6, 0x00 }, /* X */
    { 0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18, 0x18, 0x00 }, /* Y */
    { 0xfe, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xfe, 0x00 }, /* Z */
    { 0x3c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3c, 0x00 }, /* [ */
    { 0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x03, 0x00 }, /* \ */
    { 0x3c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c, 0x00 }, /* ] */
    { 0x00, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00 }, /* ^ */
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff }, /* _ */
    { 0x30, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* ` */
    { 0x00, 0x00, 0x7c, 0x06, 0x7e, 0xc6, 0x7e, 0x00 }, /* a */
    { 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0x00 }, /* b */
    { 0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0x7e, 0x00 }, /* c */
    { 0x06, 0x06, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x00 }, /* d */
    { 0x00, 0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0x7e, 0x00 }, /* e */
    { 0x1e, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x30, 0x00 }, /* f */
    { 0x00, 0x00, 0x7e, 0xc6, 0xce, 0x76, 0x06, 0x7c }, /* g */
    { 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00 }, /*  */
    { 0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x3c, 0x00 }, /* i */
    { 0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0xf0 }, /* j */
    { 0xc0, 0xc0, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0x00 }, /* k */
    { 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00 }, /* l */
    { 0x00, 0x00, 0xcc, 0xfe, 0xd6, 0xc6, 0xc6, 0x00 }, /* m */
    { 0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00 }, /* n */
    { 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0x00 }, /* o */
    { 0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0xc0 }, /* p */
    { 0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x06 }, /* q */
    { 0x00, 0x00, 0x6e, 0x70, 0x60, 0x60, 0x60, 0x00 }, /* r */
    { 0x00, 0x00, 0x7c, 0xc0, 0x7c, 0x06, 0xfc, 0x00 }, /* s */
    { 0x30, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x1c, 0x00 }, /* t */
    { 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00 }, /* u */
    { 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00 }, /* v */
    { 0x00, 0x00, 0xc6, 0xc6, 0xd6, 0xfe, 0x6c, 0x00 }, /* w */
    { 0x00, 0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00 }, /* x */
    { 0x00, 0x00, 0xc6, 0xc6, 0xce, 0x76, 0x06, 0x7c }, /* y */
    { 0x00, 0x00, 0xfc, 0x18, 0x30, 0x60, 0xfc, 0x00 }, /* z */
    { 0x0e, 0x18, 0x18, 0x70, 0x18, 0x18, 0x0e, 0x00 }, /* { */
    { 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00 }, /* | */
    { 0xe0, 0x30, 0x30, 0x1c, 0x30, 0x30, 0xe0, 0x00 }, /* } */
    { 0x00, 0x00, 0x70, 0x9a, 0x0e, 0x00, 0x00, 0x00 }, /* ~ */
    { 0x00, 0x00, 0x18, 0x3c, 0x66, 0xff, 0x00, 0x00 } /* Ascii 127 */
};

void DrawText(SavedImage *Image,
                 const int x, const int y,
                 const char *legend,
                 const int color)
{
    int i, j;
    int base;
    const char *cp;

    for (i = 0; i < GIF_FONT_HEIGHT; i++)
    {
      base = Image->ImageDesc.Width * (y + i) + x;

      for (cp = legend; *cp; cp++)
          for (j = 0; j < GIF_FONT_WIDTH; j++)
          {
            if (AsciiTable[*cp][i] & (1 << (GIF_FONT_WIDTH - j)))
                Image->RasterBits[base] = color;
            base++;
          }
    }
}

void DrawBox(SavedImage *Image,
                 const int x, const int y,
                 const int w, const int d,
                 const int color)
{
    int j, base = Image->ImageDesc.Width * y + x;

    for (j = 0; j < w; j++)
      Image->RasterBits[base + j] 
          = Image->RasterBits[base + (d * Image->ImageDesc.Width) + j]
            = color;

    for (j = 0; j < d; j++)
      Image->RasterBits[base + j * Image->ImageDesc.Width]
          = Image->RasterBits[base + j * Image->ImageDesc.Width + w]
            = color;
}

void DrawRectangle(SavedImage *Image,
                 const int x, const int y,
                 const int w, const int d,
                 const int color)
{
    char *bp = Image->RasterBits + Image->ImageDesc.Width * y + x;
    int i;

    for (i = 0; i < d; i++)
      memset(bp + (i * Image->ImageDesc.Width), color, w);
}


void DrawBoxedText(SavedImage *Image,
                 const int x, const int y,
                 const char *legend,
                 const int border,
                 const int bg, const int fg)
{
    int     i, j = 0, LineCount = 0, TextWidth = 0;
    const char    *cp;

    /* compute size of text to box */
    for (cp = legend; *cp; cp++)
      if (*cp == '\r')
      {
          if (j > TextWidth)
            TextWidth = j;
          j = 0;
          LineCount++;
      }
      else if (*cp != '\t')
          ++j;
    LineCount++;  /* count last line */
    if (j > TextWidth)  /* last line might be longer than any previous */
      TextWidth = j;

    /* fill the box */
    DrawRectangle(Image,
          x + 1, y + 1,
          border + TextWidth * GIF_FONT_WIDTH + border - 1,
          border + LineCount * GIF_FONT_HEIGHT + border - 1,
          bg);


    /* draw the text */
    i = 0;
    cp = strtok((char *)legend, "\r\n");
    do {
      int leadspace = 0;

      if (cp[0] == '\t')
          leadspace = (TextWidth - strlen(++cp)) / 2;

      DrawText(Image,
             x + border + (leadspace * GIF_FONT_WIDTH),
             y + border + (GIF_FONT_HEIGHT * i++),
             cp, fg);
    } while
      (cp = strtok((char *)NULL, "\r\n"));

    /* outline the box */
    DrawBox(Image,
          x, y,
          border + TextWidth * GIF_FONT_WIDTH + border,
          border + LineCount * GIF_FONT_HEIGHT + border,
          fg);
}

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