pad.c

   1 #include <ctype.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include "draw.h"
   6 #include "font.h"
   7 #include "util.h"
   8 #include "pad.h"
   9
  10 static int rows, cols;
  11 static unsigned int cd[] = {
  12         0x0a0a0a, 0xc04444, 0x339933, 0xcccc66,
  13         0x5566bc, 0xcd66af, 0xa166cd, 0xeeeeee,
  14         0x71a3b7, 0xc08888, 0x779977, 0xcccc99,
  15         0x8899bc, 0xcd99af, 0xa199cd, 0xdedede};
  16
  17 void pad_init(void)
  18 {
  19         fb_init();
  20         font_init();
  21         rows = fb_rows() / font_rows();
  22         cols = fb_cols() / font_cols();
  23 }
  24
  25 void pad_free(void)
  26 {
  27         fb_free();
  28 }
  29
  30 #define CR(a)           (((a) >> 16) & 0x0000ff)
  31 #define CG(a)           (((a) >> 8) & 0x0000ff)
  32 #define CB(a)           ((a) & 0x0000ff)
  33 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  34
  35 static fbval_t mixed_color(int fg, int bg, unsigned char val)
  36 {
  37         unsigned int fore = cd[fg], back = cd[bg];
  38         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  39         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  40         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  41         return fb_color(r, g, b);
  42 }
  43
  44 static fbval_t color2fb(int c)
  45 {
  46         return fb_color(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  47 }
  48
  49 #define NCACHE          ((1 << 11) - 1)
  50 static fbval_t cache[NCACHE * MAXDOTS];
  51 static struct glyph {
  52         int c;
  53         short fg, bg;
  54 } cacheid[NCACHE];
  55
  56 static int glyph_hash(struct glyph *g)
  57 {
  58         return (g->c | (((g->fg + 1) ^ g->bg) << 7)) % NCACHE;
  59 }
  60
  61 static fbval_t *bitmap(int c, short fg, short bg)
  62 {
  63         unsigned char *bits;
  64         fbval_t *fbbits;
  65         struct glyph glyph = {0};
  66         int hash;
  67         int i;
  68         int nbits = font_rows() * font_cols();
  69         if (!isprint(c) || isspace(c))
  70                 return NULL;
  71         bits = font_bitmap(c, fg >= 8);
  72         glyph.c = c;
  73         glyph.fg = fg;
  74         glyph.bg = bg;
  75         hash = glyph_hash(&glyph);
  76         fbbits = &cache[hash * MAXDOTS];
  77         if (!memcmp(&glyph, &cacheid[hash], sizeof(glyph)))
  78                 return fbbits;
  79         cacheid[hash] = glyph;
  80         for (i = 0; i < nbits; i++)
  81                 fbbits[i] = mixed_color(fg, bg, bits[i]);
  82         return fbbits;
  83 }
  84
  85 void pad_put(int ch, int r, int c, int fg, int bg)
  86 {
  87         int sr = font_rows() * r;
  88         int sc = font_cols() * c;
  89         int frows = font_rows(), fcols = font_cols();
  90         int i;
  91         fbval_t *bits = bitmap(ch, fg, bg);
  92         if (!bits)
  93                 fb_box(sr, sc, sr + frows, sc + fcols, color2fb(bg));
  94         else
  95                 for (i = 0; i < frows; i++)
  96                         fb_set(sr + i, sc, bits + (i * fcols), fcols);
  97 }
  98
  99 void pad_scroll(int sr, int nr, int n, int c)
 100 {
 101         fb_scroll(sr * font_rows(), nr * font_rows(),
 102                   n * font_rows(), color2fb(c));
 103 }
 104
 105 void pad_blank(int c)
 106 {
 107         fb_box(0, 0, fb_rows(), fb_cols(), color2fb(c));
 108 }
 109
 110 int pad_rows(void)
 111 {
 112         return rows;
 113 }
 114
 115 int pad_cols(void)
 116 {
 117         return cols;
 118 }
 119
 120 void pad_shown(void)
 121 {
 122         fb_cmap();
 123 }