1/* 2 * Copyright © 2012 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27#ifdef HAVE_CONFIG_H 28#include "config.h" 29#endif 30 31#include "ansi-print.hh" 32 33#include <assert.h> 34#include <stdlib.h> 35#include <stddef.h> 36#include <string.h> 37#include <stdio.h> 38#include <math.h> 39#include <fcntl.h> 40#ifdef HAVE_UNISTD_H 41#include <unistd.h> /* for isatty() */ 42#endif 43 44#define MIN(a,b) ((a) < (b) ? (a) : (b)) 45 46#define CELL_W 8 47#define CELL_H (2 * CELL_W) 48 49struct color_diff_t 50{ 51 int dot (const color_diff_t &o) 52 { return v[0]*o.v[0] + v[1]*o.v[1] + v[2]*o.v[2] + v[3]*o.v[3]; } 53 54 int v[4]; 55}; 56 57struct color_t 58{ 59 static color_t from_ansi (unsigned int x) 60 { 61 color_t c = {(0xFF<<24) | ((0xFF*(x&1))<<16) | ((0xFF*((x >> 1)&1))<<8) | (0xFF*((x >> 2)&1))}; 62 return c; 63 } 64 unsigned int to_ansi (void) 65 { 66 return ((v >> 23) & 1) | ((v >> 14)&2) | ((v >> 5)&4); 67 } 68 69 color_diff_t diff (const color_t &o) 70 { 71 color_diff_t d; 72 for (unsigned int i = 0; i < 4; i++) 73 d.v[i] = (int) ((v >> (i*8))&0xFF) - (int) ((o.v >> (i*8))&0xFF); 74 return d; 75 } 76 77 uint32_t v; 78}; 79 80struct image_t 81{ 82 public: 83 84 image_t (unsigned int width_, 85 unsigned int height_, 86 const uint32_t *data_, 87 unsigned int stride_) : 88 width (width_), 89 height (height_), 90 own_data (false), 91 data ((color_t *) data_), 92 stride (stride_) {} 93 image_t (unsigned int width_, 94 unsigned int height_) : 95 width (width_), 96 height (height_), 97 own_data (true), 98 data ((color_t *) malloc (sizeof (data[0]) * width * height)), 99 stride (width) {} 100 ~image_t (void) 101 { if (own_data) free (data); } 102 103 color_t &operator () (unsigned int x, unsigned int y) 104 { return data[x + y * stride]; } 105 106 color_t operator () (unsigned int x, unsigned int y) const 107 { return data[x + y * stride]; } 108 109 void 110 copy_sub_image (const image_t &s, 111 unsigned int x, unsigned int y, 112 unsigned int w, unsigned int h) 113 { 114 assert (x < width); 115 assert (y < height); 116 for (unsigned int row = 0; row < h; row++) { 117 color_t *p = data + x + MIN (y + row, height - 1) * stride; 118 color_t *q = s.data + row * s.stride; 119 if (x + w <= width) 120 for (unsigned int col = 0; col < w; col++) 121 *q++ = *p++; 122 else { 123 unsigned int limit = width - x; 124 for (unsigned int col = 0; col < limit; col++) 125 *q++ = *p++; 126 p--; 127 for (unsigned int col = limit; col < w; col++) 128 *q++ = *p; 129 } 130 } 131 } 132 133 const unsigned int width; 134 const unsigned int height; 135 136 private: 137 bool own_data; 138 color_t * const data; 139 const unsigned int stride; 140}; 141 142struct biimage_t 143{ 144 public: 145 146 biimage_t (unsigned int width, unsigned int height) : 147 width (width), 148 height (height), 149 data ((uint8_t *) malloc (sizeof (data[0]) * width * height)) {} 150 ~biimage_t (void) 151 { free (data); } 152 153 void set (const image_t &image) 154 { 155 assert (image.width == width); 156 assert (image.height == height); 157 int freq[8] = {0}; 158 for (unsigned int y = 0; y < height; y++) 159 for (unsigned int x = 0; x < width; x++) { 160 color_t c = image (x, y); 161 freq[c.to_ansi ()]++; 162 } 163 bg = 0; 164 for (unsigned int i = 1; i < 8; i++) 165 if (freq[bg] < freq[i]) 166 bg = i; 167 fg = 0; 168 for (unsigned int i = 1; i < 8; i++) 169 if (i != bg && freq[fg] < freq[i]) 170 fg = i; 171 if (fg == bg || freq[fg] == 0) { 172 fg = bg; 173 unicolor = true; 174 } 175 else 176 unicolor = false; 177 178 /* Set the data... */ 179 180 if (unicolor) { 181 memset (data, 0, sizeof (data[0]) * width * height); 182 return; 183 } 184 185 color_t bgc = color_t::from_ansi (bg); 186 color_t fgc = color_t::from_ansi (fg); 187 color_diff_t diff = fgc.diff (bgc); 188 int dd = diff.dot (diff); 189 for (unsigned int y = 0; y < height; y++) 190 for (unsigned int x = 0; x < width; x++) { 191 int d = diff.dot (image (x, y).diff (bgc)); 192 (*this)(x, y) = d < 0 ? 0 : d > dd ? 255 : lround (d * 255. / dd); 193 } 194 } 195 196 uint8_t &operator () (unsigned int x, unsigned int y) 197 { return data[x + y * width]; } 198 199 uint8_t operator () (unsigned int x, unsigned int y) const 200 { return data[x + y * width]; } 201 202 const unsigned int width; 203 const unsigned int height; 204 unsigned int bg; 205 unsigned int fg; 206 bool unicolor; 207 208 private: 209 uint8_t * const data; 210}; 211 212const char * 213block_best (const biimage_t &bi, unsigned int *score, bool *inverse) 214{ 215 assert (bi.width <= CELL_W); 216 assert (bi.height <= CELL_H); 217 218 unsigned int row_sum[CELL_H] = {0}; 219 unsigned int col_sum[CELL_W] = {0}; 220 unsigned int row_sum_i[CELL_H] = {0}; 221 unsigned int col_sum_i[CELL_W] = {0}; 222 unsigned int quad[2][2] = {{0}}; 223 unsigned int quad_i[2][2] = {{0}}; 224 unsigned int total = 0; 225 unsigned int total_i = 0; 226 for (unsigned int y = 0; y < bi.height; y++) 227 for (unsigned int x = 0; x < bi.width; x++) { 228 unsigned int c = bi (x, y); 229 unsigned int c_i = 255 - c; 230 row_sum[y] += c; 231 row_sum_i[y] += c_i; 232 col_sum[x] += c; 233 col_sum_i[x] += c_i; 234 quad[2 * y / bi.height][2 * x / bi.width] += c; 235 quad_i[2 * y / bi.height][2 * x / bi.width] += c_i; 236 total += c; 237 total_i += c_i; 238 } 239 240 /* Make the sums cummulative */ 241 for (unsigned int i = 1; i < bi.height; i++) { 242 row_sum[i] += row_sum[i - 1]; 243 row_sum_i[i] += row_sum_i[i - 1]; 244 } 245 for (unsigned int i = 1; i < bi.width; i++) { 246 col_sum[i] += col_sum[i - 1]; 247 col_sum_i[i] += col_sum_i[i - 1]; 248 } 249 250 const char *best_c = " "; 251 252 /* Maybe empty is better! */ 253 if (total < *score) { 254 *score = total; 255 *inverse = false; 256 best_c = " "; 257 } 258 /* Maybe full is better! */ 259 if (total_i < *score) { 260 *score = total_i; 261 *inverse = true; 262 best_c = " "; 263 } 264 265 /* Find best lower line */ 266 if (1) { 267 unsigned int best_s = (unsigned int) -1; 268 bool best_inv = false; 269 int best_i = 0; 270 for (unsigned int i = 0; i < bi.height - 1; i++) 271 { 272 unsigned int s; 273 s = row_sum[i] + total_i - row_sum_i[i]; 274 if (s < best_s) { 275 best_s = s; 276 best_i = i; 277 best_inv = false; 278 } 279 s = row_sum_i[i] + total - row_sum[i]; 280 if (s < best_s) { 281 best_s = s; 282 best_i = i; 283 best_inv = true; 284 } 285 } 286 if (best_s < *score) { 287 static const char *lower[7] = {"▁", "▂", "▃", "▄", "▅", "▆", "▇"}; 288 unsigned int which = lround (((best_i + 1) * 8) / bi.height); 289 if (1 <= which && which <= 7) { 290 *score = best_s; 291 *inverse = best_inv; 292 best_c = lower[7 - which]; 293 } 294 } 295 } 296 297 /* Find best left line */ 298 if (1) { 299 unsigned int best_s = (unsigned int) -1; 300 bool best_inv = false; 301 int best_i = 0; 302 for (unsigned int i = 0; i < bi.width - 1; i++) 303 { 304 unsigned int s; 305 s = col_sum[i] + total_i - col_sum_i[i]; 306 if (s < best_s) { 307 best_s = s; 308 best_i = i; 309 best_inv = true; 310 } 311 s = col_sum_i[i] + total - col_sum[i]; 312 if (s < best_s) { 313 best_s = s; 314 best_i = i; 315 best_inv = false; 316 } 317 } 318 if (best_s < *score) { 319 static const char *left [7] = {"▏", "▎", "▍", "▌", "▋", "▊", "▉"}; 320 unsigned int which = lround (((best_i + 1) * 8) / bi.width); 321 if (1 <= which && which <= 7) { 322 *score = best_s; 323 *inverse = best_inv; 324 best_c = left[which - 1]; 325 } 326 } 327 } 328 329 /* Find best quadrant */ 330 if (1) { 331 unsigned int q = 0; 332 unsigned int qs = 0; 333 for (unsigned int i = 0; i < 2; i++) 334 for (unsigned int j = 0; j < 2; j++) 335 if (quad[i][j] > quad_i[i][j]) { 336 q += 1 << (2 * i + j); 337 qs += quad_i[i][j]; 338 } else 339 qs += quad[i][j]; 340 if (qs < *score) { 341 const char *c = NULL; 342 bool inv = false; 343 switch (q) { 344 case 1: c = "▟"; inv = true; break; 345 case 2: c = "▙"; inv = true; break; 346 case 4: c = "▖"; inv = false; break; 347 case 8: c = "▗"; inv = false; break; 348 case 9: c = "▚"; inv = false; break; 349 case 6: c = "▞"; inv = false; break; 350 case 7: c = "▜"; inv = true; break; 351 case 11: c = "▜"; inv = true; break; 352 case 13: c = "▙"; inv = true; break; 353 case 14: c = "▟"; inv = true; break; 354 } 355 if (c) { 356 *score = qs; 357 *inverse = inv; 358 best_c = c; 359 } 360 } 361 } 362 363 return best_c; 364} 365 366void 367ansi_print_image_rgb24 (const uint32_t *data, 368 unsigned int width, 369 unsigned int height, 370 unsigned int stride) 371{ 372 image_t image (width, height, data, stride); 373 374 unsigned int rows = (height + CELL_H - 1) / CELL_H; 375 unsigned int cols = (width + CELL_W - 1) / CELL_W; 376 image_t cell (CELL_W, CELL_H); 377 biimage_t bi (CELL_W, CELL_H); 378 unsigned int last_bg = -1, last_fg = -1; 379 for (unsigned int row = 0; row < rows; row++) { 380 for (unsigned int col = 0; col < cols; col++) { 381 image.copy_sub_image (cell, col * CELL_W, row * CELL_H, CELL_W, CELL_H); 382 bi.set (cell); 383 if (bi.unicolor) { 384 if (last_bg != bi.bg) { 385 printf ("\e[%dm", 40 + bi.bg); 386 last_bg = bi.bg; 387 } 388 printf (" "); 389 } else { 390 /* Figure out the closest character to the biimage */ 391 unsigned int score = (unsigned int) -1; 392 bool inverse = false; 393 const char *c = block_best (bi, &score, &inverse); 394 if (inverse) { 395 if (last_bg != bi.fg || last_fg != bi.bg) { 396 printf ("\e[%d;%dm", 30 + bi.bg, 40 + bi.fg); 397 last_bg = bi.fg; 398 last_fg = bi.bg; 399 } 400 } else { 401 if (last_bg != bi.bg || last_fg != bi.fg) { 402 printf ("\e[%d;%dm", 40 + bi.bg, 30 + bi.fg); 403 last_bg = bi.bg; 404 last_fg = bi.fg; 405 } 406 } 407 printf ("%s", c); 408 } 409 } 410 printf ("\e[0m\n"); /* Reset */ 411 last_bg = last_fg = -1; 412 } 413} 414