Mercurial > hgrepos > Python2 > PyMuPDF

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
parents
children
comparison
equal deleted inserted replaced
1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright © 2022 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_USER_HH
28 #define HELPER_CAIRO_USER_HH
29
30 #include "font-options.hh"
31
32 #include <cairo.h>
33 #include <hb.h>
34
35 #include "hb-blob.hh"
36
37 static void
38 move_to (hb_draw_funcs_t *dfuncs,
39 cairo_t *cr,
40 hb_draw_state_t *st,
41 float to_x, float to_y,
42 void *)
43 {
44 cairo_move_to (cr,
45 (double) to_x, (double) to_y);
46 }
47
48 static void
49 line_to (hb_draw_funcs_t *dfuncs,
50 cairo_t *cr,
51 hb_draw_state_t *st,
52 float to_x, float to_y,
53 void *)
54 {
55 cairo_line_to (cr,
56 (double) to_x, (double) to_y);
57 }
58
59 static void
60 cubic_to (hb_draw_funcs_t *dfuncs,
61 cairo_t *cr,
62 hb_draw_state_t *st,
63 float control1_x, float control1_y,
64 float control2_x, float control2_y,
65 float to_x, float to_y,
66 void *)
67 {
68 cairo_curve_to (cr,
69 (double) control1_x, (double) control1_y,
70 (double) control2_x, (double) control2_y,
71 (double) to_x, (double) to_y);
72 }
73
74 static void
75 close_path (hb_draw_funcs_t *dfuncs,
76 cairo_t *cr,
77 hb_draw_state_t *st,
78 void *)
79 {
80 cairo_close_path (cr);
81 }
82
83
84 static hb_draw_funcs_t *
85 get_cairo_draw_funcs ()
86 {
87 static hb_draw_funcs_t *funcs;
88
89 if (!funcs)
90 {
91 funcs = hb_draw_funcs_create ();
92 hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr);
93 hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr);
94 hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr);
95 hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr);
96 }
97
98 return funcs;
99 }
100
101 static const cairo_user_data_key_t _hb_font_cairo_user_data_key = {0};
102
103 static cairo_status_t
104 render_glyph (cairo_scaled_font_t *scaled_font,
105 unsigned long glyph,
106 cairo_t *cr,
107 cairo_text_extents_t *extents)
108 {
109 hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
110 &_hb_font_cairo_user_data_key));
111
112 hb_position_t x_scale, y_scale;
113 hb_font_get_scale (font, &x_scale, &y_scale);
114 cairo_scale (cr, +1./x_scale, -1./y_scale);
115
116 hb_font_get_glyph_shape (font, glyph, get_cairo_draw_funcs (), cr);
117 cairo_fill (cr);
118
119 return CAIRO_STATUS_SUCCESS;
120 }
121
122 #ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
123
124 #ifdef CAIRO_HAS_PNG_FUNCTIONS
125 static inline cairo_status_t
126 _hb_bytes_read_func (hb_bytes_t *src,
127 char *data,
128 unsigned length)
129 {
130 if (unlikely (src->length < length))
131 return CAIRO_STATUS_READ_ERROR;
132
133 memcpy (data, src->arrayZ, length);
134 *src += length;
135
136 return CAIRO_STATUS_SUCCESS;
137 }
138
139 static cairo_status_t
140 render_color_glyph_png (cairo_scaled_font_t *scaled_font,
141 unsigned long glyph,
142 cairo_t *cr,
143 cairo_text_extents_t *extents)
144 {
145 hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
146 &_hb_font_cairo_user_data_key));
147
148 hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph);
149 if (blob == hb_blob_get_empty ())
150 return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
151
152 hb_position_t x_scale, y_scale;
153 hb_font_get_scale (font, &x_scale, &y_scale);
154 cairo_scale (cr, +1./x_scale, -1./y_scale);
155
156 /* Draw PNG. */
157 hb_bytes_t bytes = blob->as_bytes ();
158 cairo_surface_t *surface = cairo_image_surface_create_from_png_stream ((cairo_read_func_t) _hb_bytes_read_func,
159 std::addressof (bytes));
160 hb_blob_destroy (blob);
161
162 if (unlikely (cairo_surface_status (surface)) != CAIRO_STATUS_SUCCESS)
163 {
164 cairo_surface_destroy (surface);
165 return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
166 }
167
168 int width = cairo_image_surface_get_width (surface);
169 int height = cairo_image_surface_get_width (surface);
170
171 hb_glyph_extents_t hb_extents;
172 if (unlikely (!hb_font_get_glyph_extents (font, glyph, &hb_extents)))
173 {
174 cairo_surface_destroy (surface);
175 return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
176 }
177
178 cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
179 cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
180
181 cairo_matrix_t matrix = {(double) width, 0, 0, (double) height, 0, 0};
182 cairo_pattern_set_matrix (pattern, &matrix);
183
184 cairo_translate (cr, hb_extents.x_bearing, hb_extents.y_bearing);
185 cairo_scale (cr, hb_extents.width, hb_extents.height);
186 cairo_set_source (cr, pattern);
187
188 cairo_rectangle (cr, 0, 0, 1, 1);
189 cairo_fill (cr);
190 cairo_pattern_destroy (pattern);
191
192 cairo_surface_destroy (surface);
193 return CAIRO_STATUS_SUCCESS;
194 }
195 #endif
196
197 static cairo_status_t
198 render_color_glyph_layers (cairo_scaled_font_t *scaled_font,
199 unsigned long glyph,
200 cairo_t *cr,
201 cairo_text_extents_t *extents)
202 {
203 hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
204 &_hb_font_cairo_user_data_key));
205 hb_face_t *face = hb_font_get_face (font);
206
207 unsigned count = hb_ot_color_glyph_get_layers (face, glyph, 0, nullptr, nullptr);
208 if (!count)
209 return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
210
211 hb_ot_color_layer_t layers[16];
212 unsigned offset = 0, len;
213 do {
214 len = ARRAY_LENGTH (layers);
215 hb_ot_color_glyph_get_layers (face, glyph,
216 offset,
217 &len,
218 layers);
219 for (unsigned i = 0; i < len; i++)
220 {
221 hb_color_t color;
222 unsigned clen = 1;
223 unsigned color_index = layers[i].color_index;
224 bool is_foreground = color_index == 65535;
225
226 if (!is_foreground)
227 {
228 hb_ot_color_palette_get_colors (face,
229 0/*palette_index*/,
230 color_index/*start_offset*/,
231 &clen/*color_count*/,
232 &color);
233 if (clen < 1)
234 continue;
235 }
236
237 cairo_save (cr);
238 {
239 if (!is_foreground)
240 cairo_set_source_rgba (cr,
241 hb_color_get_red (color) / 255.,
242 hb_color_get_green (color) / 255.,
243 hb_color_get_blue (color) / 255.,
244 hb_color_get_alpha (color) / 255.);
245
246 cairo_status_t ret = render_glyph (scaled_font, layers[i].glyph, cr, extents);
247 if (ret != CAIRO_STATUS_SUCCESS)
248 return ret;
249 }
250 cairo_restore (cr);
251 }
252 }
253 while (len == ARRAY_LENGTH (layers));
254 return CAIRO_STATUS_SUCCESS;
255 }
256
257 static cairo_status_t
258 render_color_glyph (cairo_scaled_font_t *scaled_font,
259 unsigned long glyph,
260 cairo_t *cr,
261 cairo_text_extents_t *extents)
262 {
263 cairo_status_t ret = CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;
264
265 #ifdef CAIRO_HAS_PNG_FUNCTIONS
266 ret = render_color_glyph_png (scaled_font, glyph, cr, extents);
267 if (ret != CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
268 return ret;
269 #endif
270
271 ret = render_color_glyph_layers (scaled_font, glyph, cr, extents);
272 if (ret != CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
273 return ret;
274
275 return render_glyph (scaled_font, glyph, cr, extents);
276 }
277
278 #endif
279
280 static inline cairo_font_face_t *
281 helper_cairo_create_user_font_face (const font_options_t *font_opts)
282 {
283 cairo_font_face_t *cairo_face = cairo_user_font_face_create ();
284
285 cairo_font_face_set_user_data (cairo_face,
286 &_hb_font_cairo_user_data_key,
287 hb_font_reference (font_opts->font),
288 (cairo_destroy_func_t) hb_font_destroy);
289
290 cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph);
291 #ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
292 hb_face_t *face = hb_font_get_face (font_opts->font);
293 if (hb_ot_color_has_png (face) || hb_ot_color_has_layers (face))
294 cairo_user_font_face_set_render_color_glyph_func (cairo_face, render_color_glyph);
295 #endif
296
297 return cairo_face;
298 }
299
300 static inline bool
301 helper_cairo_user_font_face_has_data (cairo_font_face_t *font_face)
302 {
303 return cairo_font_face_get_user_data (font_face, &_hb_font_cairo_user_data_key);
304 }
305
306 static inline bool
307 helper_cairo_user_scaled_font_has_color (cairo_scaled_font_t *scaled_font)
308 {
309 /* Ignoring SVG for now, since we cannot render it. */
310 hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
311 &_hb_font_cairo_user_data_key));
312 hb_face_t *face = hb_font_get_face (font);
313 return hb_ot_color_has_png (face) || hb_ot_color_has_layers (face);
314 }
315
316 #endif