pad.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <ft2build.h>
   4 #include FT_FREETYPE_H
   5 #include FT_BITMAP_H
   6 #include "draw.h"
   7
   8 #define FONTFACE        "/home/ali/.fonts/monaco.ttf"
   9 #define FONTSIZE        10
  10 #define DPI             192
  11 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  12 #define MAX(a, b)       ((a) > (b) ? (a) : (b))
  13
  14 static FT_Library library;
  15 static FT_Face face;
  16 static int rows, cols;
  17 static int row, col;
  18 static int char_height, char_width;
  19 static int fg, bg;
  20
  21 static unsigned int cd[] = {
  22         0x0a0a0a, 0xc04444, 0x339933, 0xcccc66,
  23         0x5566bc, 0xcd66af, 0xa166cd, 0xeeeeee,
  24         0x71a3b7, 0xc08888, 0x779977, 0xcccc99,
  25         0x8899bc, 0xcd99af, 0xa199cd, 0xdedede};
  26
  27 static void init_size(void)
  28 {
  29         char_height = face->size->metrics.height >> 6;
  30         char_width = face->size->metrics.max_advance >> 6;
  31         rows = fb_rows() / char_height;
  32         cols = fb_cols() / char_width;
  33 }
  34
  35 void pad_init(void)
  36 {
  37         FT_Init_FreeType(&library);
  38         FT_New_Face(library, FONTFACE, 0, &face);
  39         FT_Set_Char_Size(face, 0, FONTSIZE << 6, DPI, DPI);
  40         fb_init();
  41         init_size();
  42 }
  43
  44 void pad_free(void)
  45 {
  46         fb_free();
  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 u16_t mixed_color(u8_t val)
  55 {
  56         unsigned int fore = cd[fg], back = cd[bg];
  57         u8_t r = COLORMERGE(CR(fore), CR(back), val);
  58         u8_t g = COLORMERGE(CG(fore), CG(back), val);
  59         u8_t b = COLORMERGE(CB(fore), CB(back), val);
  60         return fb_color(r, g, b);
  61 }
  62
  63 static void draw_bitmap(FT_Bitmap *bitmap, int r, int c)
  64 {
  65         int i, j;
  66         for (i = 0; i < bitmap->rows; i++) {
  67                 for (j = 0; j < bitmap->width; j++) {
  68                         u8_t val = bitmap->buffer[i * bitmap->width + j];
  69                         fb_put(r + i, c + j, mixed_color(val));
  70                 }
  71         }
  72 }
  73
  74 void pad_fg(int c)
  75 {
  76         fg = c;
  77 }
  78
  79 void pad_bg(int c)
  80 {
  81         bg = c;
  82 }
  83
  84 void pad_put(int ch, int r, int c)
  85 {
  86         int sr = char_height * r;
  87         int sc = char_width * c;
  88         FT_Load_Char(face, ch, FT_LOAD_RENDER);
  89         if (fg >= 8) {
  90                 int FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot);
  91                 FT_GlyphSlot_Own_Bitmap(face->glyph);
  92                 FT_Bitmap_Embolden(library, &face->glyph->bitmap, 32, 32);
  93         }
  94         fb_box(sr, sc, sr + char_height, sc + char_width, mixed_color(0));
  95         sr -= face->glyph->bitmap_top - char_height;
  96         sc += face->glyph->bitmap_left / 2;
  97         draw_bitmap(&face->glyph->bitmap, sr, sc);
  98 }
  99
 100 static void advance(int c)
 101 {
 102         switch (c) {
 103         case '\n':
 104                 row++;
 105                 col = 0;
 106                 break;
 107         case '\t':
 108                 col = (col / 8 + 1) * 8;
 109                 break;
 110         case '\b':
 111                 if (col)
 112                         col--;
 113                 break;
 114         case '\r':
 115                 col = 0;
 116                 break;
 117         case '\a':
 118         case '\f':
 119         case '\v':
 120                 break;
 121         default:
 122                 col++;
 123         }
 124         if (col >= cols) {
 125                 row++;
 126                 col = 0;
 127         }
 128         if (row >= rows) {
 129                 fb_scroll(-char_height);
 130                 row = rows - 1;
 131                 fb_box(row * char_height, 0, fb_rows(), fb_cols(),
 132                         mixed_color(0));
 133         }
 134 }
 135
 136 void pad_add(int c)
 137 {
 138         if (!strchr("\a\b\f\n\r\t\v", c))
 139                 pad_put(c, row, col);
 140         advance(c);
 141 }
 142
 143 void pad_blank(void)
 144 {
 145         fb_box(0, 0, fb_rows(), fb_cols(), mixed_color(0));
 146 }
 147
 148 void pad_move(int r, int c)
 149 {
 150         row = MIN(r, rows - 1);
 151         col = MIN(c, cols - 1);
 152 }
 153
 154 int pad_row(void)
 155 {
 156         return row;
 157 }
 158
 159 int pad_col(void)
 160 {
 161         return col;
 162 }
 163
 164 int pad_rows(void)
 165 {
 166         return rows;
 167 }
 168
 169 int pad_cols(void)
 170 {
 171         return cols;
 172 }