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 "fbpad.h"
   8
   9 #define FN_C(fg)        ((fg) & ~(FN_I | FN_B))
  10 #define NCACHE          (1 << 11)
  11 #define MAXFBWIDTH      (1 << 12)
  12
  13 static unsigned int cd[256] = {
  14         COLOR0, COLOR1, COLOR2, COLOR3,
  15         COLOR4, COLOR5, COLOR6, COLOR7,
  16         COLOR8, COLOR9, COLOR10, COLOR11,
  17         COLOR12, COLOR13, COLOR14, COLOR15};
  18 static int rows, cols;
  19 static int fnrows, fncols;
  20 static struct font *fonts[3];
  21
  22 int pad_init(void)
  23 {
  24         int r, g, b;
  25         if (fb_init())
  26                 return 1;
  27         if (sizeof(fbval_t) != FBM_BPP(fb_mode())) {
  28                 fprintf(stderr, "pad_init: fbval_t doesn't match fb depth\n");
  29                 return 1;
  30         }
  31         if (pad_font(FR, FI, FB) < 0)
  32                 return -1;
  33         fnrows = font_rows(fonts[0]);
  34         fncols = font_cols(fonts[0]);
  35         rows = fb_rows() / fnrows;
  36         cols = fb_cols() / fncols;
  37         for (r = 0; r < 6; r++) {
  38                 for (g = 0; g < 6; g++) {
  39                         for (b = 0; b < 6; b++) {
  40                                 int idx = 16 + r * 36 + g * 6 + b;
  41                                 cd[idx] = ((r * 40 + 55) << 16) |
  42                                                 ((g * 40 + 55) << 8) |
  43                                                 (b * 40 + 55);
  44                         }
  45                 }
  46         }
  47         for (r = 0; r < 24; r++)
  48                 cd[232 + r] = ((r * 10 + 8) << 16) |
  49                                 ((r * 10 + 8) << 8) | (r * 10 + 8);
  50         return 0;
  51 }
  52
  53 void pad_free(void)
  54 {
  55         int i;
  56         for (i = 0; i < 3; i++)
  57                 if (fonts[i])
  58                         font_free(fonts[i]);
  59         fb_free();
  60 }
  61
  62 #define CR(a)           (((a) >> 16) & 0x0000ff)
  63 #define CG(a)           (((a) >> 8) & 0x0000ff)
  64 #define CB(a)           ((a) & 0x0000ff)
  65 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  66
  67 static unsigned mixed_color(int fg, int bg, unsigned val)
  68 {
  69         unsigned int fore = cd[fg], back = cd[bg];
  70         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  71         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  72         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  73         return FB_VAL(r, g, b);
  74 }
  75
  76 static unsigned color2fb(int c)
  77 {
  78         return FB_VAL(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  79 }
  80
  81 static fbval_t cache[NCACHE][NDOTS];
  82 static struct glyph {
  83         int c;
  84         short fg, bg;
  85 } glyphs[NCACHE];
  86
  87 static struct glyph *glyph_entry(int c, int fg, int bg)
  88 {
  89         return &glyphs[((c - 32) ^ (fg << 6) ^ (bg << 5)) & (NCACHE - 1)];
  90 }
  91
  92 static fbval_t *glyph_cache(int c, short fg, short bg)
  93 {
  94         struct glyph *g = glyph_entry(c, fg, bg);
  95         if (g->c == c && g->fg == fg && g->bg == bg)
  96                 return cache[g - glyphs];
  97         return NULL;
  98 }
  99
 100 static fbval_t *glyph_add(int c, short fg, short bg)
 101 {
 102         struct glyph *g = glyph_entry(c, fg, bg);
 103         g->c = c;
 104         g->fg = fg;
 105         g->bg = bg;
 106         return cache[g - glyphs];
 107 }
 108
 109 static void bmp2fb(fbval_t *d, char *s, int fg, int bg, int nr, int nc)
 110 {
 111         int i, j;
 112         for (i = 0; i < fnrows; i++) {
 113                 for (j = 0; j < fncols; j++) {
 114                         unsigned v = i < nr && j < nc ?
 115                                 (unsigned char) s[i * nc + j] : 0;
 116                         d[i * fncols + j] = mixed_color(fg, bg, v);
 117                 }
 118         }
 119 }
 120
 121 static fbval_t *ch2fb(int fn, int c, short fg, short bg)
 122 {
 123         char bits[NDOTS];
 124         fbval_t *fbbits;
 125         if (c < 0 || (c < 128 && (!isprint(c) || isspace(c))))
 126                 return NULL;
 127         if ((fbbits = glyph_cache(c, fg, bg)))
 128                 return fbbits;
 129         if (font_bitmap(fonts[fn], bits, c))
 130                 return NULL;
 131         fbbits = glyph_add(c, fg, bg);
 132         bmp2fb(fbbits, bits, FN_C(fg), FN_C(bg),
 133                 font_rows(fonts[fn]), font_cols(fonts[fn]));
 134         return fbbits;
 135 }
 136
 137 static void fb_box(int sr, int sc, int er, int ec, fbval_t val)
 138 {
 139         static fbval_t line[MAXFBWIDTH];
 140         int cn = ec - sc;
 141         int i;
 142         for (i = 0; i < cn; i++)
 143                 line[i] = val;
 144         for (i = sr; i < er; i++)
 145                 fb_set(i, sc, line, cn);
 146 }
 147
 148 static int fnsel(int fg, int bg)
 149 {
 150         if ((fg | bg) & FN_B)
 151                 return fonts[2] ? 2 : 0;
 152         if ((fg | bg) & FN_I)
 153                 return fonts[1] ? 1 : 0;
 154         return 0;
 155 }
 156
 157 void pad_put(int ch, int r, int c, int fg, int bg)
 158 {
 159         int sr = fnrows * r;
 160         int sc = fncols * c;
 161         int i;
 162         fbval_t *bits = ch2fb(fnsel(fg, bg), ch, fg, bg);
 163         if (!bits)
 164                 bits = ch2fb(0, ch, fg, bg);
 165         if (!bits)
 166                 fb_box(sr, sc, sr + fnrows, sc + fncols, color2fb(FN_C(bg)));
 167         else
 168                 for (i = 0; i < fnrows; i++)
 169                         fb_set(sr + i, sc, bits + (i * fncols), fncols);
 170 }
 171
 172 void pad_blank(int c)
 173 {
 174         fb_box(0, 0, fb_rows(), fb_cols(), color2fb(FN_C(c)));
 175 }
 176
 177 void pad_blankrow(int r, int bg)
 178 {
 179         int sr = r * fnrows;
 180         int er = r == rows - 1 ? fb_rows() : (r + 1) * fnrows;
 181         fb_box(sr, 0, er, fb_cols(), color2fb(FN_C(bg)));
 182 }
 183
 184 int pad_rows(void)
 185 {
 186         return rows;
 187 }
 188
 189 int pad_cols(void)
 190 {
 191         return cols;
 192 }
 193
 194 int pad_font(char *fr, char *fi, char *fb)
 195 {
 196         char *fns[] = {fr, fi, fb};
 197         int i;
 198         for (i = 0; i < 3; i++) {
 199                 if (fonts[i])
 200                         font_free(fonts[i]);
 201                 fonts[i] = fns[i] ? font_open(fns[i]) : NULL;
 202         }
 203         memset(glyphs, 0, sizeof(glyphs));
 204         if (!fonts[0])
 205                 fprintf(stderr, "pad: bad font <%s>\n", fr);
 206         return fonts[0] ? 0 : -1;
 207 }