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 static unsigned int cd[256] = {
  10         COLOR0, COLOR1, COLOR2, COLOR3,
  11         COLOR4, COLOR5, COLOR6, COLOR7,
  12         COLOR8, COLOR9, COLOR10, COLOR11,
  13         COLOR12, COLOR13, COLOR14, COLOR15};
  14 static int rows, cols;
  15 static int fnrows, fncols;
  16 static struct font *fonts[3];
  17
  18 int pad_init(void)
  19 {
  20         int r, g, b;
  21         if (pad_font(FR, FI, FB))
  22                 return 1;
  23         rows = fb_rows() / fnrows;
  24         cols = fb_cols() / fncols;
  25         for (r = 0; r < 6; r++) {
  26                 for (g = 0; g < 6; g++) {
  27                         for (b = 0; b < 6; b++) {
  28                                 int idx = 16 + r * 36 + g * 6 + b;
  29                                 cd[idx] = ((r * 40 + 55) << 16) |
  30                                                 ((g * 40 + 55) << 8) |
  31                                                 (b * 40 + 55);
  32                         }
  33                 }
  34         }
  35         for (r = 0; r < 24; r++)
  36                 cd[232 + r] = ((r * 10 + 8) << 16) |
  37                                 ((r * 10 + 8) << 8) | (r * 10 + 8);
  38         return 0;
  39 }
  40
  41 void pad_free(void)
  42 {
  43         int i;
  44         for (i = 0; i < 3; i++)
  45                 if (fonts[i])
  46                         font_free(fonts[i]);
  47 }
  48
  49 #define CR(a)           (((a) >> 16) & 0x0000ff)
  50 #define CG(a)           (((a) >> 8) & 0x0000ff)
  51 #define CB(a)           ((a) & 0x0000ff)
  52 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  53
  54 static unsigned mixed_color(int fg, int bg, unsigned val)
  55 {
  56         unsigned int fore = cd[fg], back = cd[bg];
  57         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  58         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  59         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  60         return FB_VAL(r, g, b);
  61 }
  62
  63 static unsigned color2fb(int c)
  64 {
  65         return FB_VAL(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  66 }
  67
  68 /* glyph bitmap cache */
  69 #define GCLCNT          (1 << 7)        /* glyph cache list count */
  70 #define GCLLEN          (1 << 4)        /* glyph cache list length */
  71 #define GCIDX(c)        ((c) & (GCLCNT - 1))
  72
  73 static fbval_t gc_mem[GCLCNT][GCLLEN][NDOTS];
  74 static int gc_next[GCLCNT];
  75 static struct glyph {
  76         int c;
  77         short fg, bg;
  78 } gc_info[GCLCNT][GCLLEN];
  79
  80 static fbval_t *gc_get(int c, short fg, short bg)
  81 {
  82         struct glyph *g = gc_info[GCIDX(c)];
  83         int i;
  84         for (i = 0; i < GCLLEN; i++)
  85                 if (g[i].c == c && g[i].fg == fg && g[i].bg == bg)
  86                         return gc_mem[GCIDX(c)][i];
  87         return NULL;
  88 }
  89
  90 static fbval_t *gc_put(int c, short fg, short bg)
  91 {
  92         int idx = GCIDX(c);
  93         int pos = gc_next[idx]++;
  94         struct glyph *g = &gc_info[idx][pos];
  95         if (gc_next[idx] >= GCLLEN)
  96                 gc_next[idx] = 0;
  97         g->c = c;
  98         g->fg = fg;
  99         g->bg = bg;
 100         return gc_mem[idx][pos];
 101 }
 102
 103 static void bmp2fb(fbval_t *d, char *s, int fg, int bg, int nr, int nc)
 104 {
 105         int i, j;
 106         for (i = 0; i < fnrows; i++) {
 107                 for (j = 0; j < fncols; j++) {
 108                         unsigned v = i < nr && j < nc ?
 109                                 (unsigned char) s[i * nc + j] : 0;
 110                         d[i * fncols + j] = mixed_color(fg, bg, v);
 111                 }
 112         }
 113 }
 114
 115 static fbval_t *ch2fb(int fn, int c, short fg, short bg)
 116 {
 117         char bits[NDOTS];
 118         fbval_t *fbbits;
 119         if (c < 0 || (c < 128 && (!isprint(c) || isspace(c))))
 120                 return NULL;
 121         if ((fbbits = gc_get(c, fg, bg)))
 122                 return fbbits;
 123         if (font_bitmap(fonts[fn], bits, c))
 124                 return NULL;
 125         fbbits = gc_put(c, fg, bg);
 126         bmp2fb(fbbits, bits, fg & FN_C, bg & FN_C,
 127                 font_rows(fonts[fn]), font_cols(fonts[fn]));
 128         return fbbits;
 129 }
 130
 131 static void fb_set(int r, int c, void *mem, int len)
 132 {
 133         int bpp = FBM_BPP(fb_mode());
 134         memcpy(fb_mem(r) + c * bpp, mem, len * bpp);
 135 }
 136
 137 static void fb_box(int sr, int er, int sc, int ec, fbval_t val)
 138 {
 139         static fbval_t line[32 * NCOLS];
 140         int i;
 141         for (i = sc; i < ec; i++)
 142                 line[i - sc] = val;
 143         for (i = sr; i < er; i++)
 144                 fb_set(i, sc, line, ec - sc);
 145 }
 146
 147 static int fnsel(int fg, int bg)
 148 {
 149         if ((fg | bg) & FN_B)
 150                 return fonts[2] ? 2 : 0;
 151         if ((fg | bg) & FN_I)
 152                 return fonts[1] ? 1 : 0;
 153         return 0;
 154 }
 155
 156 void pad_put(int ch, int r, int c, int fg, int bg)
 157 {
 158         int sr = fnrows * r;
 159         int sc = fncols * c;
 160         fbval_t *bits;
 161         int i;
 162         if ((fg & 0xfff8) == FN_B && !fonts[2])
 163                 fg |= 8;                /* increase intensity of no FB */
 164         bits = ch2fb(fnsel(fg, bg), ch, fg, bg);
 165         if (!bits)
 166                 bits = ch2fb(0, ch, fg, bg);
 167         if (!bits)
 168                 fb_box(sr, sr + fnrows, sc, sc + fncols, color2fb(bg & FN_C));
 169         else
 170                 for (i = 0; i < fnrows; i++)
 171                         fb_set(sr + i, sc, bits + (i * fncols), fncols);
 172 }
 173
 174 void pad_fill(int sr, int er, int sc, int ec, int c)
 175 {
 176         int fber = er >= 0 ? er * fnrows : fb_rows();
 177         int fbec = ec >= 0 ? ec * fncols : fb_cols();
 178         fb_box(sr * fnrows, fber, sc * fncols, fbec, color2fb(c & FN_C));
 179 }
 180
 181 int pad_rows(void)
 182 {
 183         return rows;
 184 }
 185
 186 int pad_cols(void)
 187 {
 188         return cols;
 189 }
 190
 191 int pad_font(char *fr, char *fi, char *fb)
 192 {
 193         struct font *r, *i, *b;
 194         memset(gc_info, 0, sizeof(gc_info));
 195         r = fr ? font_open(fr) : NULL;
 196         i = fi ? font_open(fi) : NULL;
 197         b = fb ? font_open(fb) : NULL;
 198         if (!r)
 199                 fprintf(stderr, "pad: bad font <%s>\n", fr);
 200         fonts[0] = r ? r : fonts[0];
 201         fonts[1] = i;
 202         fonts[2] = b;
 203         fnrows = fonts[0] ? font_rows(fonts[0]) : 16;
 204         fncols = fonts[0] ? font_cols(fonts[0]) : 16;
 205         return r == NULL;
 206 }