pad.c

   1 #include <ctype.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include "config.h"
   6 #include "draw.h"
   7 #include "font.h"
   8 #include "util.h"
   9 #include "pad.h"
  10
  11 #define NCACHE          (1 << 11)
  12 #define MAXFBWIDTH      (1 << 12)
  13
  14 static unsigned int cd[] = {
  15         COLOR0, COLOR1, COLOR2, COLOR3,
  16         COLOR4, COLOR5, COLOR6, COLOR7,
  17         COLOR8, COLOR9, COLOR10, COLOR11,
  18         COLOR12, COLOR13, COLOR14, COLOR15};
  19 static int rows, cols;
  20 static int fnrows, fncols;
  21 static struct font *fonts[3];
  22
  23 int pad_init(void)
  24 {
  25         int i;
  26         char *paths[] = {FR, FI, FB};
  27         if (fb_init())
  28                 return 1;
  29         if (sizeof(fbval_t) != FBM_BPP(fb_mode())) {
  30                 fprintf(stderr, "pad_init: fbval_t doesn't match fb depth\n");
  31                 return 1;
  32         }
  33         for (i = 0; i < 3; i++)
  34                 fonts[i] = paths[i] ? font_open(paths[i]) : NULL;
  35         if (!fonts[0]) {
  36                 fprintf(stderr, "pad: bad font <%s>\n", paths[0]);
  37                 return -1;
  38         }
  39         fnrows = font_rows(fonts[0]);
  40         fncols = font_cols(fonts[0]);
  41         rows = fb_rows() / fnrows;
  42         cols = fb_cols() / fncols;
  43         return 0;
  44 }
  45
  46 void pad_free(void)
  47 {
  48         int i;
  49         for (i = 0; i < 3; i++)
  50                 if (fonts[i])
  51                         font_free(fonts[i]);
  52         fb_free();
  53 }
  54
  55 #define CR(a)           (((a) >> 16) & 0x0000ff)
  56 #define CG(a)           (((a) >> 8) & 0x0000ff)
  57 #define CB(a)           ((a) & 0x0000ff)
  58 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  59
  60 static unsigned mixed_color(int fg, int bg, unsigned val)
  61 {
  62         unsigned int fore = cd[fg], back = cd[bg];
  63         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  64         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  65         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  66         return FB_VAL(r, g, b);
  67 }
  68
  69 static unsigned color2fb(int c)
  70 {
  71         return FB_VAL(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  72 }
  73
  74 static fbval_t cache[NCACHE][MAXDOTS];
  75 static struct glyph {
  76         int c;
  77         short fg, bg;
  78 } glyphs[NCACHE];
  79
  80 static struct glyph *glyph_entry(int c, int fg, int bg)
  81 {
  82         return &glyphs[((c - 32) ^ (fg << 6) ^ (bg << 5)) & (NCACHE - 1)];
  83 }
  84
  85 static fbval_t *glyph_cache(int c, short fg, short bg)
  86 {
  87         struct glyph *g = glyph_entry(c, fg, bg);
  88         if (g->c == c && g->fg == fg && g->bg == bg)
  89                 return cache[g - glyphs];
  90         return NULL;
  91 }
  92
  93 static fbval_t *glyph_add(int c, short fg, short bg)
  94 {
  95         struct glyph *g = glyph_entry(c, fg, bg);
  96         g->c = c;
  97         g->fg = fg;
  98         g->bg = bg;
  99         return cache[g - glyphs];
 100 }
 101
 102 static void bmp2fb(fbval_t *d, char *s, int fg, int bg, int nr, int nc)
 103 {
 104         int i, j;
 105         for (i = 0; i < fnrows; i++) {
 106                 for (j = 0; j < fncols; j++) {
 107                         unsigned v = i < nr && j < nc ?
 108                                 (unsigned char) s[i * nc + j] : 0;
 109                         d[i * fncols + j] = mixed_color(fg, bg, v);
 110                 }
 111         }
 112 }
 113
 114 static fbval_t *ch2fb(int fn, int c, short fg, short bg)
 115 {
 116         char bits[MAXDOTS];
 117         fbval_t *fbbits;
 118         if (c < 0 || (c < 128 && (!isprint(c) || isspace(c))))
 119                 return NULL;
 120         if ((fbbits = glyph_cache(c, fg, bg)))
 121                 return fbbits;
 122         if (font_bitmap(fonts[fn], bits, c))
 123                 return NULL;
 124         fbbits = glyph_add(c, fg, bg);
 125         bmp2fb(fbbits, bits, FN_C(fg), FN_C(bg),
 126                 font_rows(fonts[fn]), font_cols(fonts[fn]));
 127         return fbbits;
 128 }
 129
 130 static void fb_box(int sr, int sc, int er, int ec, fbval_t val)
 131 {
 132         static fbval_t line[MAXFBWIDTH];
 133         int cn = ec - sc;
 134         int i;
 135         for (i = 0; i < cn; i++)
 136                 line[i] = val;
 137         for (i = sr; i < er; i++)
 138                 fb_set(i, sc, line, cn);
 139 }
 140
 141 static int fnsel(int fg, int bg)
 142 {
 143         if ((fg | bg) & FN_B)
 144                 return fonts[2] ? 2 : 0;
 145         if ((fg | bg) & FN_I)
 146                 return fonts[1] ? 1 : 0;
 147         return 0;
 148 }
 149
 150 void pad_put(int ch, int r, int c, int fg, int bg)
 151 {
 152         int sr = fnrows * r;
 153         int sc = fncols * c;
 154         int i;
 155         fbval_t *bits = ch2fb(fnsel(fg, bg), ch, fg, bg);
 156         if (!bits)
 157                 bits = ch2fb(0, ch, fg, bg);
 158         if (!bits)
 159                 fb_box(sr, sc, sr + fnrows, sc + fncols, color2fb(FN_C(bg)));
 160         else
 161                 for (i = 0; i < fnrows; i++)
 162                         fb_set(sr + i, sc, bits + (i * fncols), fncols);
 163 }
 164
 165 void pad_blank(int c)
 166 {
 167         fb_box(0, 0, fb_rows(), fb_cols(), color2fb(FN_C(c)));
 168 }
 169
 170 void pad_blankrow(int r, int bg)
 171 {
 172         int sr = r * fnrows;
 173         int er = r == rows - 1 ? fb_rows() : (r + 1) * fnrows;
 174         fb_box(sr, 0, er, fb_cols(), color2fb(FN_C(bg)));
 175 }
 176
 177 int pad_rows(void)
 178 {
 179         return rows;
 180 }
 181
 182 int pad_cols(void)
 183 {
 184         return cols;
 185 }