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         if (font_init()) {
  27                 fprintf(stderr, "pad_init: loading font failed\n");
  28                 return 1;
  29         }
  30         rows = fb_rows() / font_rows();
  31         cols = fb_cols() / font_cols();
  32         return 0;
  33 }
  34
  35 void pad_free(void)
  36 {
  37         font_free();
  38         fb_free();
  39 }
  40
  41 #define CR(a)           (((a) >> 16) & 0x0000ff)
  42 #define CG(a)           (((a) >> 8) & 0x0000ff)
  43 #define CB(a)           ((a) & 0x0000ff)
  44 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  45
  46 static unsigned mixed_color(int fg, int bg, unsigned char val)
  47 {
  48         unsigned int fore = cd[fg], back = cd[bg];
  49         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  50         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  51         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  52         return FB_VAL(r, g, b);
  53 }
  54
  55 static unsigned color2fb(int c)
  56 {
  57         return FB_VAL(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  58 }
  59
  60 #define NCACHE          (1 << 11)
  61 static fbval_t cache[NCACHE * MAXDOTS];
  62 static struct glyph {
  63         int c;
  64         short fg, bg;
  65 } cacheid[NCACHE];
  66
  67 static int glyph_hash(int c, int fg, int bg)
  68 {
  69         return (c ^ (fg << 7) ^ (bg << 6)) & (NCACHE - 1);
  70 }
  71
  72 static fbval_t *bitmap(int c, short fg, short bg)
  73 {
  74         unsigned char bits[MAXDOTS];
  75         fbval_t *fbbits;
  76         struct glyph *glyph;
  77         int i;
  78         int nbits = font_rows() * font_cols();
  79         if (c < 0 || (c < 256 && (!isprint(c) || isspace(c))))
  80                 return NULL;
  81         glyph = &cacheid[glyph_hash(c, fg, bg)];
  82         fbbits = &cache[glyph_hash(c, fg, bg) * MAXDOTS];
  83         if (glyph->c == c && glyph->fg == fg && glyph->bg == bg)
  84                 return fbbits;
  85         if (font_bitmap(bits, c))
  86                 return NULL;
  87         glyph->c = c;
  88         glyph->fg = fg;
  89         glyph->bg = bg;
  90         for (i = 0; i < nbits; i++)
  91                 fbbits[i] = mixed_color(fg, bg, bits[i]);
  92         return fbbits;
  93 }
  94
  95 #define MAXFBWIDTH      (1 << 12)
  96 static void fb_box(int sr, int sc, int er, int ec, fbval_t val)
  97 {
  98         static fbval_t line[MAXFBWIDTH];
  99         int cn = ec - sc;
 100         int i;
 101         for (i = 0; i < cn; i++)
 102                 line[i] = val;
 103         for (i = sr; i < er; i++)
 104                 fb_set(i, sc, line, cn);
 105 }
 106
 107 void pad_put(int ch, int r, int c, int fg, int bg)
 108 {
 109         int sr = font_rows() * r;
 110         int sc = font_cols() * c;
 111         int frows = font_rows(), fcols = font_cols();
 112         int i;
 113         fbval_t *bits = bitmap(ch, fg, bg);
 114         if (!bits)
 115                 fb_box(sr, sc, sr + frows, sc + fcols, color2fb(bg));
 116         else
 117                 for (i = 0; i < frows; i++)
 118                         fb_set(sr + i, sc, bits + (i * fcols), fcols);
 119 }
 120
 121 void pad_blank(int c)
 122 {
 123         fb_box(0, 0, fb_rows(), fb_cols(), color2fb(c));
 124 }
 125
 126 void pad_blankrow(int r, int bg)
 127 {
 128         int sr = r * font_rows();
 129         int er = r == rows - 1 ? fb_rows() : (r + 1) * font_rows();
 130         fb_box(sr, 0, er, fb_cols(), color2fb(bg));
 131 }
 132
 133 int pad_rows(void)
 134 {
 135         return rows;
 136 }
 137
 138 int pad_cols(void)
 139 {
 140         return cols;
 141 }
 142
 143 void pad_shown(void)
 144 {
 145         fb_cmap();
 146 }