428 lines
10 KiB
C++
428 lines
10 KiB
C++
/*
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* Copyright © 2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "ansi-print.hh"
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#include <assert.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <math.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for isatty() */
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#endif
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#if defined (_MSC_VER) && (_MSC_VER < 1800)
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static inline long int
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lround (double x)
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{
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if (x >= 0)
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return floor (x + 0.5);
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else
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return ceil (x - 0.5);
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}
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#endif
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#define ESC_E (char)27
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#define CELL_W 8
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#define CELL_H (2 * CELL_W)
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struct color_diff_t
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{
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int dot (const color_diff_t &o)
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{ return v[0]*o.v[0] + v[1]*o.v[1] + v[2]*o.v[2] + v[3]*o.v[3]; }
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int v[4];
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};
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struct color_t
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{
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static color_t from_ansi (unsigned int x)
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{
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color_t c = {(0xFF<<24) | ((0xFF*(x&1))<<16) | ((0xFF*((x >> 1)&1))<<8) | (0xFF*((x >> 2)&1))};
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return c;
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}
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unsigned int to_ansi (void)
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{
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return ((v >> 23) & 1) | ((v >> 14)&2) | ((v >> 5)&4);
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}
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color_diff_t diff (const color_t &o)
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{
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color_diff_t d;
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for (unsigned int i = 0; i < 4; i++)
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d.v[i] = (int) ((v >> (i*8))&0xFF) - (int) ((o.v >> (i*8))&0xFF);
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return d;
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}
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uint32_t v;
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};
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struct image_t
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{
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public:
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image_t (unsigned int width_,
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unsigned int height_,
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const uint32_t *data_,
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unsigned int stride_) :
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width (width_),
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height (height_),
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own_data (false),
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data ((color_t *) data_),
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stride (stride_) {}
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image_t (unsigned int width_,
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unsigned int height_) :
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width (width_),
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height (height_),
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own_data (true),
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data ((color_t *) malloc (sizeof (data[0]) * width * height)),
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stride (width) {}
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~image_t (void)
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{ if (own_data) free (data); }
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color_t &operator () (unsigned int x, unsigned int y)
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{ return data[x + y * stride]; }
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color_t operator () (unsigned int x, unsigned int y) const
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{ return data[x + y * stride]; }
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void
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copy_sub_image (const image_t &s,
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unsigned int x, unsigned int y,
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unsigned int w, unsigned int h)
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{
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assert (x < width);
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assert (y < height);
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for (unsigned int row = 0; row < h; row++) {
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color_t *p = data + x + MIN (y + row, height - 1) * stride;
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color_t *q = s.data + row * s.stride;
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if (x + w <= width)
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for (unsigned int col = 0; col < w; col++)
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*q++ = *p++;
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else {
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unsigned int limit = width - x;
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for (unsigned int col = 0; col < limit; col++)
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*q++ = *p++;
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p--;
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for (unsigned int col = limit; col < w; col++)
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*q++ = *p;
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}
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}
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}
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const unsigned int width;
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const unsigned int height;
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private:
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bool own_data;
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color_t * const data;
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const unsigned int stride;
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};
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struct biimage_t
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{
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public:
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biimage_t (unsigned int width, unsigned int height) :
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width (width),
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height (height),
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bg (0), fg (0), unicolor (true),
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data ((uint8_t *) malloc (sizeof (data[0]) * width * height)) {}
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~biimage_t (void)
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{ free (data); }
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void set (const image_t &image)
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{
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assert (image.width == width);
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assert (image.height == height);
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int freq[8] = {0};
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for (unsigned int y = 0; y < height; y++)
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for (unsigned int x = 0; x < width; x++) {
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color_t c = image (x, y);
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freq[c.to_ansi ()]++;
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}
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bg = 0;
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for (unsigned int i = 1; i < 8; i++)
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if (freq[bg] < freq[i])
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bg = i;
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fg = 0;
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for (unsigned int i = 1; i < 8; i++)
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if (i != bg && freq[fg] < freq[i])
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fg = i;
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if (fg == bg || freq[fg] == 0) {
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fg = bg;
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unicolor = true;
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}
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else
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unicolor = false;
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/* Set the data... */
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if (unicolor) {
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memset (data, 0, sizeof (data[0]) * width * height);
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return;
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}
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color_t bgc = color_t::from_ansi (bg);
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color_t fgc = color_t::from_ansi (fg);
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color_diff_t diff = fgc.diff (bgc);
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int dd = diff.dot (diff);
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for (unsigned int y = 0; y < height; y++)
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for (unsigned int x = 0; x < width; x++) {
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int d = diff.dot (image (x, y).diff (bgc));
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(*this)(x, y) = d < 0 ? 0 : d > dd ? 255 : lround (d * 255. / dd);
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}
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}
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uint8_t &operator () (unsigned int x, unsigned int y)
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{ return data[x + y * width]; }
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uint8_t operator () (unsigned int x, unsigned int y) const
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{ return data[x + y * width]; }
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const unsigned int width;
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const unsigned int height;
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unsigned int bg;
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unsigned int fg;
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bool unicolor;
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private:
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uint8_t * const data;
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};
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const char *
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block_best (const biimage_t &bi, bool *inverse)
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{
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assert (bi.width <= CELL_W);
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assert (bi.height <= CELL_H);
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unsigned int score = (unsigned int) -1;
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unsigned int row_sum[CELL_H] = {0};
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unsigned int col_sum[CELL_W] = {0};
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unsigned int row_sum_i[CELL_H] = {0};
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unsigned int col_sum_i[CELL_W] = {0};
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unsigned int quad[2][2] = {{0}};
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unsigned int quad_i[2][2] = {{0}};
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unsigned int total = 0;
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unsigned int total_i = 0;
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for (unsigned int y = 0; y < bi.height; y++)
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for (unsigned int x = 0; x < bi.width; x++) {
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unsigned int c = bi (x, y);
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unsigned int c_i = 255 - c;
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row_sum[y] += c;
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row_sum_i[y] += c_i;
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col_sum[x] += c;
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col_sum_i[x] += c_i;
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quad[2 * y / bi.height][2 * x / bi.width] += c;
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quad_i[2 * y / bi.height][2 * x / bi.width] += c_i;
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total += c;
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total_i += c_i;
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}
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/* Make the sums cummulative */
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for (unsigned int i = 1; i < bi.height; i++) {
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row_sum[i] += row_sum[i - 1];
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row_sum_i[i] += row_sum_i[i - 1];
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}
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for (unsigned int i = 1; i < bi.width; i++) {
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col_sum[i] += col_sum[i - 1];
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col_sum_i[i] += col_sum_i[i - 1];
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}
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const char *best_c = " ";
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/* Maybe empty is better! */
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if (total < score) {
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score = total;
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*inverse = false;
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best_c = " ";
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}
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/* Maybe full is better! */
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if (total_i < score) {
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score = total_i;
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*inverse = true;
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best_c = " ";
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}
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/* Find best lower line */
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if (1) {
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unsigned int best_s = (unsigned int) -1;
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bool best_inv = false;
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int best_i = 0;
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for (unsigned int i = 0; i < bi.height - 1; i++)
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{
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unsigned int s;
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s = row_sum[i] + total_i - row_sum_i[i];
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if (s < best_s) {
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best_s = s;
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best_i = i;
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best_inv = false;
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}
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s = row_sum_i[i] + total - row_sum[i];
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if (s < best_s) {
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best_s = s;
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best_i = i;
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best_inv = true;
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}
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}
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if (best_s < score) {
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static const char *lower[7] = {"▁", "▂", "▃", "▄", "▅", "▆", "▇"};
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unsigned int which = lround ((double) ((best_i + 1) * 8) / bi.height);
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if (1 <= which && which <= 7) {
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score = best_s;
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*inverse = best_inv;
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best_c = lower[7 - which];
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}
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}
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}
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/* Find best left line */
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if (1) {
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unsigned int best_s = (unsigned int) -1;
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bool best_inv = false;
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int best_i = 0;
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for (unsigned int i = 0; i < bi.width - 1; i++)
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{
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unsigned int s;
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s = col_sum[i] + total_i - col_sum_i[i];
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if (s < best_s) {
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best_s = s;
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best_i = i;
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best_inv = true;
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}
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s = col_sum_i[i] + total - col_sum[i];
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if (s < best_s) {
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best_s = s;
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best_i = i;
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best_inv = false;
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}
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}
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if (best_s < score) {
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static const char *left [7] = {"▏", "▎", "▍", "▌", "▋", "▊", "▉"};
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unsigned int which = lround ((double) ((best_i + 1) * 8) / bi.width);
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if (1 <= which && which <= 7) {
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score = best_s;
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*inverse = best_inv;
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best_c = left[which - 1];
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}
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}
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}
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/* Find best quadrant */
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if (1) {
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unsigned int q = 0;
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unsigned int qs = 0;
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for (unsigned int i = 0; i < 2; i++)
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for (unsigned int j = 0; j < 2; j++)
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if (quad[i][j] > quad_i[i][j]) {
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q += 1 << (2 * i + j);
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qs += quad_i[i][j];
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} else
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qs += quad[i][j];
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if (qs < score) {
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const char *c = nullptr;
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bool inv = false;
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switch (q) {
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case 1: c = "▟"; inv = true; break;
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case 2: c = "▙"; inv = true; break;
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case 4: c = "▖"; inv = false; break;
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case 8: c = "▗"; inv = false; break;
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case 9: c = "▚"; inv = false; break;
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case 6: c = "▞"; inv = false; break;
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case 7: c = "▜"; inv = true; break;
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case 11: c = "▜"; inv = true; break;
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case 13: c = "▙"; inv = true; break;
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case 14: c = "▟"; inv = true; break;
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}
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if (c) {
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score = qs;
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*inverse = inv;
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best_c = c;
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}
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}
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}
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return best_c;
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}
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void
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ansi_print_image_rgb24 (const uint32_t *data,
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unsigned int width,
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unsigned int height,
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unsigned int stride)
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{
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image_t image (width, height, data, stride);
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unsigned int rows = (height + CELL_H - 1) / CELL_H;
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unsigned int cols = (width + CELL_W - 1) / CELL_W;
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image_t cell (CELL_W, CELL_H);
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biimage_t bi (CELL_W, CELL_H);
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unsigned int last_bg = -1, last_fg = -1;
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for (unsigned int row = 0; row < rows; row++) {
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for (unsigned int col = 0; col < cols; col++) {
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image.copy_sub_image (cell, col * CELL_W, row * CELL_H, CELL_W, CELL_H);
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bi.set (cell);
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if (bi.unicolor) {
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if (last_bg != bi.bg) {
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printf ("%c[%dm", ESC_E, 40 + bi.bg);
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last_bg = bi.bg;
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}
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printf (" ");
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} else {
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/* Figure out the closest character to the biimage */
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bool inverse = false;
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const char *c = block_best (bi, &inverse);
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if (inverse) {
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if (last_bg != bi.fg || last_fg != bi.bg) {
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printf ("%c[%d;%dm", ESC_E, 30 + bi.bg, 40 + bi.fg);
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last_bg = bi.fg;
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last_fg = bi.bg;
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}
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} else {
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if (last_bg != bi.bg || last_fg != bi.fg) {
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printf ("%c[%d;%dm", ESC_E, 40 + bi.bg, 30 + bi.fg);
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last_bg = bi.bg;
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last_fg = bi.fg;
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}
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}
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printf ("%s", c);
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}
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}
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printf ("%c[0m\n", ESC_E); /* Reset */
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last_bg = last_fg = -1;
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}
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}
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