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 #include "helper-cairo-ansi.hh"
28 #include "options.hh"
29 #include "ansi-print.hh"
30
31 #ifdef HAVE_CHAFA
32 # include <chafa.h>
33
34 /* Similar to ansi-print.cc */
35 # define CELL_W 8
36 # define CELL_H (2 * CELL_W)
37
38 static void
chafa_print_image_rgb24(const void * data,int width,int height,int stride)39 chafa_print_image_rgb24 (const void *data, int width, int height, int stride)
40 {
41 ChafaTermInfo *term_info;
42 ChafaSymbolMap *symbol_map;
43 ChafaCanvasConfig *config;
44 ChafaCanvas *canvas;
45 GString *gs;
46 unsigned int cols = (width + CELL_W - 1) / CELL_W;
47 unsigned int rows = (height + CELL_H - 1) / CELL_H;
48 gchar **environ;
49 ChafaCanvasMode mode;
50 ChafaPixelMode pixel_mode;
51
52 /* Adapt to terminal; use sixels if available, and fall back to symbols
53 * with as many colors as are supported */
54
55 environ = g_get_environ ();
56 term_info = chafa_term_db_detect (chafa_term_db_get_default (),
57 environ);
58
59 pixel_mode = CHAFA_PIXEL_MODE_SYMBOLS;
60
61 if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_BEGIN_SIXELS))
62 {
63 pixel_mode = CHAFA_PIXEL_MODE_SIXELS;
64 mode = CHAFA_CANVAS_MODE_TRUECOLOR;
65 }
66 // else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_SET_COLOR_FGBG_DIRECT))
67 // mode = CHAFA_CANVAS_MODE_TRUECOLOR;
68 else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_SET_COLOR_FGBG_256))
69 mode = CHAFA_CANVAS_MODE_INDEXED_240;
70 else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_SET_COLOR_FGBG_16))
71 mode = CHAFA_CANVAS_MODE_INDEXED_16;
72 else if (chafa_term_info_have_seq (term_info, CHAFA_TERM_SEQ_INVERT_COLORS))
73 mode = CHAFA_CANVAS_MODE_FGBG_BGFG;
74 else
75 mode = CHAFA_CANVAS_MODE_FGBG;
76
77 /* Create the configuration */
78
79 symbol_map = chafa_symbol_map_new ();
80 chafa_symbol_map_add_by_tags (symbol_map,
81 (ChafaSymbolTags) (CHAFA_SYMBOL_TAG_BLOCK
82 | CHAFA_SYMBOL_TAG_SPACE));
83
84 config = chafa_canvas_config_new ();
85 chafa_canvas_config_set_canvas_mode (config, mode);
86 chafa_canvas_config_set_pixel_mode (config, pixel_mode);
87 chafa_canvas_config_set_cell_geometry (config, 10, 20);
88 chafa_canvas_config_set_geometry (config, cols, rows);
89 chafa_canvas_config_set_symbol_map (config, symbol_map);
90 chafa_canvas_config_set_color_extractor (config, CHAFA_COLOR_EXTRACTOR_MEDIAN);
91 chafa_canvas_config_set_work_factor (config, 1.0f);
92
93 /* Create canvas, draw to it and render output string */
94
95 canvas = chafa_canvas_new (config);
96 chafa_canvas_draw_all_pixels (canvas,
97 /* Cairo byte order is host native */
98 G_BYTE_ORDER == G_LITTLE_ENDIAN
99 ? CHAFA_PIXEL_BGRA8_PREMULTIPLIED
100 : CHAFA_PIXEL_ARGB8_PREMULTIPLIED,
101 (const guint8 *) data,
102 width,
103 height,
104 stride);
105 gs = chafa_canvas_print (canvas, term_info);
106
107 /* Print the string */
108
109 fwrite (gs->str, sizeof (char), gs->len, stdout);
110
111 if (pixel_mode != CHAFA_PIXEL_MODE_SIXELS)
112 fputc ('\n', stdout);
113
114 /* Free resources */
115
116 g_string_free (gs, TRUE);
117 chafa_canvas_unref (canvas);
118 chafa_canvas_config_unref (config);
119 chafa_symbol_map_unref (symbol_map);
120 chafa_term_info_unref (term_info);
121 g_strfreev (environ);
122 }
123
124 #endif /* HAVE_CHAFA */
125
126 cairo_status_t
helper_cairo_surface_write_to_ansi_stream(cairo_surface_t * surface,cairo_write_func_t write_func,void * closure)127 helper_cairo_surface_write_to_ansi_stream (cairo_surface_t *surface,
128 cairo_write_func_t write_func,
129 void *closure)
130 {
131 unsigned int width = cairo_image_surface_get_width (surface);
132 unsigned int height = cairo_image_surface_get_height (surface);
133 if (cairo_image_surface_get_format (surface) != CAIRO_FORMAT_RGB24) {
134 cairo_surface_t *new_surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
135 cairo_t *cr = cairo_create (new_surface);
136 if (cairo_image_surface_get_format (surface) == CAIRO_FORMAT_A8) {
137 cairo_set_source_rgb (cr, 0., 0., 0.);
138 cairo_paint (cr);
139 cairo_set_source_rgb (cr, 1., 1., 1.);
140 cairo_mask_surface (cr, surface, 0, 0);
141 } else {
142 cairo_set_source_rgb (cr, 1., 1., 1.);
143 cairo_paint (cr);
144 cairo_set_source_surface (cr, surface, 0, 0);
145 cairo_paint (cr);
146 }
147 cairo_destroy (cr);
148 surface = new_surface;
149 } else
150 cairo_surface_reference (surface);
151
152 unsigned int stride = cairo_image_surface_get_stride (surface);
153 const uint32_t *data = (uint32_t *) (void *) cairo_image_surface_get_data (surface);
154
155 /* We don't have rows to spare on the terminal window...
156 * Find the tight image top/bottom and only print in between. */
157
158 /* Use corner color as background color. */
159 uint32_t bg_color = data ? * (uint32_t *) data : 0;
160
161 /* Drop first row while empty */
162 while (height)
163 {
164 unsigned int i;
165 for (i = 0; i < width; i++)
166 if (data[i] != bg_color)
167 break;
168 if (i < width)
169 break;
170 data += stride / 4;
171 height--;
172 }
173
174 /* Drop last row while empty */
175 unsigned int orig_height = height;
176 while (height)
177 {
178 const uint32_t *row = data + (height - 1) * stride / 4;
179 unsigned int i;
180 for (i = 0; i < width; i++)
181 if (row[i] != bg_color)
182 break;
183 if (i < width)
184 break;
185 height--;
186 }
187 if (height < orig_height)
188 height++; /* Add one last blank row for padding. */
189
190 if (width && height)
191 {
192 #ifdef HAVE_CHAFA
193 if (true)
194 chafa_print_image_rgb24 (data, width, height, stride);
195 else
196 #endif
197 ansi_print_image_rgb24 (data, width, height, stride / 4);
198 }
199
200 cairo_surface_destroy (surface);
201 return CAIRO_STATUS_SUCCESS;
202 }
203