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comparison mupdf-source/thirdparty/harfbuzz/util/helper-cairo-ansi.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
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 #ifndef HELPER_CAIRO_ANSI_HH
28 #define HELPER_CAIRO_ANSI_HH
29
30 #include "hb.hh"
31
32 #include <cairo.h>
33
34 #include "ansi-print.hh"
35
36 #ifdef HAVE_CHAFA
37 # include <chafa.h>
38
39 /* Similar to ansi-print.cc */
40 # define CELL_W 8
41 # define CELL_H (2 * CELL_W)
42
43 static void
44 chafa_print_image_rgb24 (const void *data, int width, int height, int stride, int level)
45 {
46 ChafaTermInfo *term_info;
47 ChafaSymbolMap *symbol_map;
48 ChafaCanvasConfig *config;
49 ChafaCanvas *canvas;
50 GString *gs;
51 unsigned int cols = (width + CELL_W - 1) / CELL_W;
52 unsigned int rows = (height + CELL_H - 1) / CELL_H;
53 gchar **environ;
54 ChafaCanvasMode mode;
55 ChafaPixelMode pixel_mode;
56
57 /* Adapt to terminal; use sixels if available, and fall back to symbols
58 * with as many colors as are supported */
59
60 environ = g_get_environ ();
61 term_info = chafa_term_db_detect (chafa_term_db_get_default (),
62 environ);
63
64 pixel_mode = CHAFA_PIXEL_MODE_SYMBOLS;
65
66 if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_BEGIN_SIXELS))
67 {
68 pixel_mode = CHAFA_PIXEL_MODE_SIXELS;
69 mode = CHAFA_CANVAS_MODE_TRUECOLOR;
70 }
71 // else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_SET_COLOR_FGBG_DIRECT))
72 // mode = CHAFA_CANVAS_MODE_TRUECOLOR;
73 else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_SET_COLOR_FGBG_256))
74 mode = CHAFA_CANVAS_MODE_INDEXED_240;
75 else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_SET_COLOR_FGBG_16))
76 mode = CHAFA_CANVAS_MODE_INDEXED_16;
77 else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_INVERT_COLORS))
78 mode = CHAFA_CANVAS_MODE_FGBG_BGFG;
79 else
80 mode = CHAFA_CANVAS_MODE_FGBG;
81
82 /* Create the configuration */
83
84 symbol_map = chafa_symbol_map_new ();
85 chafa_symbol_map_add_by_tags (symbol_map,
86 (ChafaSymbolTags) (CHAFA_SYMBOL_TAG_BLOCK
87 | CHAFA_SYMBOL_TAG_SPACE
88 | (level >= 2 ? CHAFA_SYMBOL_TAG_WEDGE : 0)
89 | (level >= 3 ? CHAFA_SYMBOL_TAG_ALL : 0)
90 ));
91
92 config = chafa_canvas_config_new ();
93 chafa_canvas_config_set_canvas_mode (config, mode);
94 chafa_canvas_config_set_pixel_mode (config, pixel_mode);
95 chafa_canvas_config_set_cell_geometry (config, CELL_W, CELL_H);
96 chafa_canvas_config_set_geometry (config, cols, rows);
97 chafa_canvas_config_set_symbol_map (config, symbol_map);
98 chafa_canvas_config_set_color_extractor (config, CHAFA_COLOR_EXTRACTOR_MEDIAN);
99 chafa_canvas_config_set_work_factor (config, 1.0f);
100
101 /* Create canvas, draw to it and render output string */
102
103 canvas = chafa_canvas_new (config);
104 chafa_canvas_draw_all_pixels (canvas,
105 /* Cairo byte order is host native */
106 G_BYTE_ORDER == G_LITTLE_ENDIAN
107 ? CHAFA_PIXEL_BGRA8_PREMULTIPLIED
108 : CHAFA_PIXEL_ARGB8_PREMULTIPLIED,
109 (const guint8 *) data,
110 width,
111 height,
112 stride);
113 gs = chafa_canvas_print (canvas, term_info);
114
115 /* Print the string */
116
117 fwrite (gs->str, sizeof (char), gs->len, stdout);
118
119 if (pixel_mode != CHAFA_PIXEL_MODE_SIXELS)
120 fputc ('\n', stdout);
121
122 /* Free resources */
123
124 g_string_free (gs, TRUE);
125 chafa_canvas_unref (canvas);
126 chafa_canvas_config_unref (config);
127 chafa_symbol_map_unref (symbol_map);
128 chafa_term_info_unref (term_info);
129 g_strfreev (environ);
130 }
131
132 #endif /* HAVE_CHAFA */
133
134 static inline cairo_status_t
135 helper_cairo_surface_write_to_ansi_stream (cairo_surface_t *surface,
136 cairo_write_func_t write_func,
137 void *closure)
138 {
139 unsigned int width = cairo_image_surface_get_width (surface);
140 unsigned int height = cairo_image_surface_get_height (surface);
141 if (cairo_image_surface_get_format (surface) != CAIRO_FORMAT_RGB24) {
142 cairo_surface_t *new_surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
143 cairo_t *cr = cairo_create (new_surface);
144 if (cairo_image_surface_get_format (surface) == CAIRO_FORMAT_A8) {
145 cairo_set_source_rgb (cr, 0., 0., 0.);
146 cairo_paint (cr);
147 cairo_set_source_rgb (cr, 1., 1., 1.);
148 cairo_mask_surface (cr, surface, 0, 0);
149 } else {
150 cairo_set_source_rgb (cr, 1., 1., 1.);
151 cairo_paint (cr);
152 cairo_set_source_surface (cr, surface, 0, 0);
153 cairo_paint (cr);
154 }
155 cairo_destroy (cr);
156 surface = new_surface;
157 } else
158 cairo_surface_reference (surface);
159
160 unsigned int stride = cairo_image_surface_get_stride (surface);
161 const uint32_t *data = (uint32_t *) (void *) cairo_image_surface_get_data (surface);
162
163 /* We don't have rows to spare on the terminal window...
164 * Find the tight image top/bottom and only print in between. */
165
166 /* Use corner color as background color. */
167 uint32_t bg_color = data ? * (uint32_t *) data : 0;
168
169 /* Drop first row while empty */
170 auto orig_data = data;
171 while (height)
172 {
173 unsigned int i;
174 for (i = 0; i < width; i++)
175 if (data[i] != bg_color)
176 break;
177 if (i < width)
178 break;
179 data += stride / 4;
180 height--;
181 }
182 if (orig_data < data)
183 {
184 data -= stride / 4;
185 height++; /* Add one first blank row for padding. */
186 }
187
188 /* Drop last row while empty */
189 auto orig_height = height;
190 while (height)
191 {
192 const uint32_t *row = data + (height - 1) * stride / 4;
193 unsigned int i;
194 for (i = 0; i < width; i++)
195 if (row[i] != bg_color)
196 break;
197 if (i < width)
198 break;
199 height--;
200 }
201 if (height < orig_height)
202 height++; /* Add one last blank row for padding. */
203
204 if (width && height)
205 {
206 #ifdef HAVE_CHAFA
207 const char *env = getenv ("HB_CHAFA");
208 int chafa_level = 1;
209 if (env)
210 chafa_level = atoi (env);
211 if (chafa_level)
212 chafa_print_image_rgb24 (data, width, height, stride, chafa_level);
213 else
214 #endif
215 ansi_print_image_rgb24 (data, width, height, stride / 4);
216 }
217
218 cairo_surface_destroy (surface);
219 return CAIRO_STATUS_SUCCESS;
220 }
221
222
223 #endif