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 void pad_init(void)
  19 {
  20         fb_init();
  21         font_init();
  22         rows = fb_rows() / font_rows();
  23         cols = fb_cols() / font_cols();
  24 }
  25
  26 void pad_free(void)
  27 {
  28         fb_free();
  29 }
  30
  31 #define CR(a)           (((a) >> 16) & 0x0000ff)
  32 #define CG(a)           (((a) >> 8) & 0x0000ff)
  33 #define CB(a)           ((a) & 0x0000ff)
  34 #define COLORMERGE(f, b, c)             ((b) + (((f) - (b)) * (c) >> 8u))
  35
  36 static fbval_t mixed_color(int fg, int bg, unsigned char val)
  37 {
  38         unsigned int fore = cd[fg], back = cd[bg];
  39         unsigned char r = COLORMERGE(CR(fore), CR(back), val);
  40         unsigned char g = COLORMERGE(CG(fore), CG(back), val);
  41         unsigned char b = COLORMERGE(CB(fore), CB(back), val);
  42         return fb_color(r, g, b);
  43 }
  44
  45 static fbval_t color2fb(int c)
  46 {
  47         return fb_color(CR(cd[c]), CG(cd[c]), CB(cd[c]));
  48 }
  49
  50 #define NCACHE          (1 << 11)
  51 static fbval_t cache[NCACHE * MAXDOTS];
  52 static struct glyph {
  53         int c;
  54         short fg, bg;
  55 } cacheid[NCACHE];
  56
  57 static int glyph_hash(struct glyph *g)
  58 {
  59         return (g->c ^ (g->fg << 7) ^ (g->bg << 6)) & (NCACHE - 1);
  60 }
  61
  62 static fbval_t *bitmap(int c, short fg, short bg)
  63 {
  64         unsigned char *bits;
  65         fbval_t *fbbits;
  66         struct glyph glyph = {0};
  67         int hash;
  68         int i;
  69         int nbits = font_rows() * font_cols();
  70         if (c < 0 || (c < 256 && (!isprint(c) || isspace(c))))
  71                 return NULL;
  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         bits = font_bitmap(c);
  80         if (!bits)
  81                 return NULL;
  82         memcpy(&cacheid[hash], &glyph, sizeof(glyph));
  83         for (i = 0; i < nbits; i++)
  84                 fbbits[i] = mixed_color(fg, bg, bits[i]);
  85         return fbbits;
  86 }
  87
  88 #define MAXFBWIDTH      (1 << 12)
  89 void fb_box(int sr, int sc, int er, int ec, fbval_t val)
  90 {
  91         static fbval_t line[MAXFBWIDTH];
  92         int cn = ec - sc;
  93         int i;
  94         for (i = 0; i < cn; i++)
  95                 line[i] = val;
  96         for (i = sr; i < er; i++)
  97                 fb_set(i, sc, line, cn);
  98 }
  99
 100 void pad_put(int ch, int r, int c, int fg, int bg)
 101 {
 102         int sr = font_rows() * r;
 103         int sc = font_cols() * c;
 104         int frows = font_rows(), fcols = font_cols();
 105         int i;
 106         fbval_t *bits = bitmap(ch, fg, bg);
 107         if (!bits)
 108                 fb_box(sr, sc, sr + frows, sc + fcols, color2fb(bg));
 109         else
 110                 for (i = 0; i < frows; i++)
 111                         fb_set(sr + i, sc, bits + (i * fcols), fcols);
 112 }
 113
 114 void pad_blank(int c)
 115 {
 116         fb_box(0, 0, fb_rows(), fb_cols(), color2fb(c));
 117 }
 118
 119 void pad_blankrow(int r, int bg)
 120 {
 121         int sr = r * font_rows();
 122         int er = r == rows - 1 ? fb_rows() : (r + 1) * font_rows();
 123         fb_box(sr, 0, er, fb_cols(), color2fb(bg));
 124 }
 125
 126 int pad_rows(void)
 127 {
 128         return rows;
 129 }
 130
 131 int pad_cols(void)
 132 {
 133         return cols;
 134 }
 135
 136 void pad_shown(void)
 137 {
 138         fb_cmap();
 139 }