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 static unsigned int cd[] = {
  12         COLOR0, COLOR1, COLOR2, COLOR3,
  13         COLOR4, COLOR5, COLOR6, COLOR7,
  14         COLOR8, COLOR9, COLOR10, COLOR11,
  15         COLOR12, COLOR13, COLOR14, COLOR15};
  16 static int rows, cols;
  17
  18 int pad_init(void)
  19 {
  20         if (fb_init())
  21                 return 1;
  22         if (sizeof(fbval_t) != FBM_BPP(fb_mode())) {
  23                 fprintf(stderr, "pad_init: fbval_t doesn't match fb depth\n");
  24                 return 1;
  25         }
  26         font_init();
  27         rows = fb_rows() / font_rows();
  28         cols = fb_cols() / font_cols();
  29         return 0;
  30 }
  31
  32 void pad_free(void)
  33 {
  34         fb_free();
  35 }
  36
  37 #define CR(a)           (((a) >> 16) & 0x0000ff)
  38 #define CG(a)           (((a) >> 8) & 0x0000ff)
  39 #define CB(a)           ((a) & 0x0000ff)
  40 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  41
  42 static unsigned mixed_color(int fg, int bg, unsigned char val)
  43 {
  44         unsigned int fore = cd[fg], back = cd[bg];
  45         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  46         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  47         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  48         return FB_VAL(r, g, b);
  49 }
  50
  51 static unsigned color2fb(int c)
  52 {
  53         return FB_VAL(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  54 }
  55
  56 #define NCACHE          (1 << 11)
  57 static fbval_t cache[NCACHE * MAXDOTS];
  58 static struct glyph {
  59         int c;
  60         short fg, bg;
  61 } cacheid[NCACHE];
  62
  63 static int glyph_hash(struct glyph *g)
  64 {
  65         return (g->c ^ (g->fg << 7) ^ (g->bg << 6)) & (NCACHE - 1);
  66 }
  67
  68 static fbval_t *bitmap(int c, short fg, short bg)
  69 {
  70         unsigned char *bits;
  71         fbval_t *fbbits;
  72         struct glyph glyph = {0};
  73         int hash;
  74         int i;
  75         int nbits = font_rows() * font_cols();
  76         if (c < 0 || (c < 256 && (!isprint(c) || isspace(c))))
  77                 return NULL;
  78         glyph.c = c;
  79         glyph.fg = fg;
  80         glyph.bg = bg;
  81         hash = glyph_hash(&glyph);
  82         fbbits = &cache[hash * MAXDOTS];
  83         if (!memcmp(&glyph, &cacheid[hash], sizeof(glyph)))
  84                 return fbbits;
  85         bits = font_bitmap(c);
  86         if (!bits)
  87                 return NULL;
  88         memcpy(&cacheid[hash], &glyph, sizeof(glyph));
  89         for (i = 0; i < nbits; i++)
  90                 fbbits[i] = mixed_color(fg, bg, bits[i]);
  91         return fbbits;
  92 }
  93
  94 #define MAXFBWIDTH      (1 << 12)
  95 static void fb_box(int sr, int sc, int er, int ec, fbval_t val)
  96 {
  97         static fbval_t line[MAXFBWIDTH];
  98         int cn = ec - sc;
  99         int i;
 100         for (i = 0; i < cn; i++)
 101                 line[i] = val;
 102         for (i = sr; i < er; i++)
 103                 fb_set(i, sc, line, cn);
 104 }
 105
 106 void pad_put(int ch, int r, int c, int fg, int bg)
 107 {
 108         int sr = font_rows() * r;
 109         int sc = font_cols() * c;
 110         int frows = font_rows(), fcols = font_cols();
 111         int i;
 112         fbval_t *bits = bitmap(ch, fg, bg);
 113         if (!bits)
 114                 fb_box(sr, sc, sr + frows, sc + fcols, color2fb(bg));
 115         else
 116                 for (i = 0; i < frows; i++)
 117                         fb_set(sr + i, sc, bits + (i * fcols), fcols);
 118 }
 119
 120 void pad_blank(int c)
 121 {
 122         fb_box(0, 0, fb_rows(), fb_cols(), color2fb(c));
 123 }
 124
 125 void pad_blankrow(int r, int bg)
 126 {
 127         int sr = r * font_rows();
 128         int er = r == rows - 1 ? fb_rows() : (r + 1) * font_rows();
 129         fb_box(sr, 0, er, fb_cols(), color2fb(bg));
 130 }
 131
 132 int pad_rows(void)
 133 {
 134         return rows;
 135 }
 136
 137 int pad_cols(void)
 138 {
 139         return cols;
 140 }
 141
 142 void pad_shown(void)
 143 {
 144         fb_cmap();
 145 }