1 /*
2 * Copyright © 2016 Google, Inc.
3 * Copyright © 2018 Ebrahim Byagowi
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Google Author(s): Sascha Brawer, Behdad Esfahbod
26 */
27
28 #include "hb.hh"
29
30 #ifndef HB_NO_COLOR
31
32 #include "hb-ot.h"
33
34 #include "OT/Color/CBDT/CBDT.hh"
35 #include "OT/Color/COLR/COLR.hh"
36 #include "OT/Color/CPAL/CPAL.hh"
37 #include "OT/Color/sbix/sbix.hh"
38 #include "OT/Color/svg/svg.hh"
39
40
41 /**
42 * SECTION:hb-ot-color
43 * @title: hb-ot-color
44 * @short_description: OpenType Color Fonts
45 * @include: hb-ot.h
46 *
47 * Functions for fetching color-font information from OpenType font faces.
48 *
49 * HarfBuzz supports `COLR`/`CPAL`, `sbix`, `CBDT`, and `SVG` color fonts.
50 **/
51
52
53 /*
54 * CPAL
55 */
56
57
58 /**
59 * hb_ot_color_has_palettes:
60 * @face: #hb_face_t to work upon
61 *
62 * Tests whether a face includes a `CPAL` color-palette table.
63 *
64 * Return value: `true` if data found, `false` otherwise
65 *
66 * Since: 2.1.0
67 */
68 hb_bool_t
hb_ot_color_has_palettes(hb_face_t * face)69 hb_ot_color_has_palettes (hb_face_t *face)
70 {
71 return face->table.CPAL->has_data ();
72 }
73
74 /**
75 * hb_ot_color_palette_get_count:
76 * @face: #hb_face_t to work upon
77 *
78 * Fetches the number of color palettes in a face.
79 *
80 * Return value: the number of palettes found
81 *
82 * Since: 2.1.0
83 */
84 unsigned int
hb_ot_color_palette_get_count(hb_face_t * face)85 hb_ot_color_palette_get_count (hb_face_t *face)
86 {
87 return face->table.CPAL->get_palette_count ();
88 }
89
90 /**
91 * hb_ot_color_palette_get_name_id:
92 * @face: #hb_face_t to work upon
93 * @palette_index: The index of the color palette
94 *
95 * Fetches the `name` table Name ID that provides display names for
96 * a `CPAL` color palette.
97 *
98 * Palette display names can be generic (e.g., "Default") or provide
99 * specific, themed names (e.g., "Spring", "Summer", "Fall", and "Winter").
100 *
101 * Return value: the Named ID found for the palette.
102 * If the requested palette has no name the result is #HB_OT_NAME_ID_INVALID.
103 *
104 * Since: 2.1.0
105 */
106 hb_ot_name_id_t
hb_ot_color_palette_get_name_id(hb_face_t * face,unsigned int palette_index)107 hb_ot_color_palette_get_name_id (hb_face_t *face,
108 unsigned int palette_index)
109 {
110 return face->table.CPAL->get_palette_name_id (palette_index);
111 }
112
113 /**
114 * hb_ot_color_palette_color_get_name_id:
115 * @face: #hb_face_t to work upon
116 * @color_index: The index of the color
117 *
118 * Fetches the `name` table Name ID that provides display names for
119 * the specified color in a face's `CPAL` color palette.
120 *
121 * Display names can be generic (e.g., "Background") or specific
122 * (e.g., "Eye color").
123 *
124 * Return value: the Name ID found for the color.
125 *
126 * Since: 2.1.0
127 */
128 hb_ot_name_id_t
hb_ot_color_palette_color_get_name_id(hb_face_t * face,unsigned int color_index)129 hb_ot_color_palette_color_get_name_id (hb_face_t *face,
130 unsigned int color_index)
131 {
132 return face->table.CPAL->get_color_name_id (color_index);
133 }
134
135 /**
136 * hb_ot_color_palette_get_flags:
137 * @face: #hb_face_t to work upon
138 * @palette_index: The index of the color palette
139 *
140 * Fetches the flags defined for a color palette.
141 *
142 * Return value: the #hb_ot_color_palette_flags_t of the requested color palette
143 *
144 * Since: 2.1.0
145 */
146 hb_ot_color_palette_flags_t
hb_ot_color_palette_get_flags(hb_face_t * face,unsigned int palette_index)147 hb_ot_color_palette_get_flags (hb_face_t *face,
148 unsigned int palette_index)
149 {
150 return face->table.CPAL->get_palette_flags (palette_index);
151 }
152
153 /**
154 * hb_ot_color_palette_get_colors:
155 * @face: #hb_face_t to work upon
156 * @palette_index: the index of the color palette to query
157 * @start_offset: offset of the first color to retrieve
158 * @color_count: (inout) (optional): Input = the maximum number of colors to return;
159 * Output = the actual number of colors returned (may be zero)
160 * @colors: (out) (array length=color_count) (nullable): The array of #hb_color_t records found
161 *
162 * Fetches a list of the colors in a color palette.
163 *
164 * After calling this function, @colors will be filled with the palette
165 * colors. If @colors is NULL, the function will just return the number
166 * of total colors without storing any actual colors; this can be used
167 * for allocating a buffer of suitable size before calling
168 * hb_ot_color_palette_get_colors() a second time.
169 *
170 * The RGBA values in the palette are unpremultiplied. See the
171 * OpenType spec [CPAL](https://learn.microsoft.com/en-us/typography/opentype/spec/cpal)
172 * section for details.
173 *
174 * Return value: the total number of colors in the palette
175 *
176 * Since: 2.1.0
177 */
178 unsigned int
hb_ot_color_palette_get_colors(hb_face_t * face,unsigned int palette_index,unsigned int start_offset,unsigned int * colors_count,hb_color_t * colors)179 hb_ot_color_palette_get_colors (hb_face_t *face,
180 unsigned int palette_index,
181 unsigned int start_offset,
182 unsigned int *colors_count /* IN/OUT. May be NULL. */,
183 hb_color_t *colors /* OUT. May be NULL. */)
184 {
185 return face->table.CPAL->get_palette_colors (palette_index, start_offset, colors_count, colors);
186 }
187
188
189 /*
190 * COLR
191 */
192
193 /**
194 * hb_ot_color_has_layers:
195 * @face: #hb_face_t to work upon
196 *
197 * Tests whether a face includes a `COLR` table
198 * with data according to COLRv0.
199 *
200 * Return value: `true` if data found, `false` otherwise
201 *
202 * Since: 2.1.0
203 */
204 hb_bool_t
hb_ot_color_has_layers(hb_face_t * face)205 hb_ot_color_has_layers (hb_face_t *face)
206 {
207 return face->table.COLR->has_v0_data ();
208 }
209
210 /**
211 * hb_ot_color_has_paint:
212 * @face: #hb_face_t to work upon
213 *
214 * Tests where a face includes a `COLR` table
215 * with data according to COLRv1.
216 *
217 * Return value: `true` if data found, `false` otherwise
218 *
219 * Since: 7.0.0
220 */
221 hb_bool_t
hb_ot_color_has_paint(hb_face_t * face)222 hb_ot_color_has_paint (hb_face_t *face)
223 {
224 return face->table.COLR->has_v1_data ();
225 }
226
227 /**
228 * hb_ot_color_glyph_has_paint:
229 * @face: #hb_face_t to work upon
230 * @glyph: The glyph index to query
231 *
232 * Tests where a face includes COLRv1 paint
233 * data for @glyph.
234 *
235 * Return value: `true` if data found, `false` otherwise
236 *
237 * Since: 7.0.0
238 */
239 hb_bool_t
hb_ot_color_glyph_has_paint(hb_face_t * face,hb_codepoint_t glyph)240 hb_ot_color_glyph_has_paint (hb_face_t *face,
241 hb_codepoint_t glyph)
242 {
243 return face->table.COLR->has_paint_for_glyph (glyph);
244 }
245
246 /**
247 * hb_ot_color_glyph_get_layers:
248 * @face: #hb_face_t to work upon
249 * @glyph: The glyph index to query
250 * @start_offset: offset of the first layer to retrieve
251 * @layer_count: (inout) (optional): Input = the maximum number of layers to return;
252 * Output = the actual number of layers returned (may be zero)
253 * @layers: (out) (array length=layer_count) (nullable): The array of layers found
254 *
255 * Fetches a list of all color layers for the specified glyph index in the specified
256 * face. The list returned will begin at the offset provided.
257 *
258 * Return value: Total number of layers available for the glyph index queried
259 *
260 * Since: 2.1.0
261 */
262 unsigned int
hb_ot_color_glyph_get_layers(hb_face_t * face,hb_codepoint_t glyph,unsigned int start_offset,unsigned int * layer_count,hb_ot_color_layer_t * layers)263 hb_ot_color_glyph_get_layers (hb_face_t *face,
264 hb_codepoint_t glyph,
265 unsigned int start_offset,
266 unsigned int *layer_count, /* IN/OUT. May be NULL. */
267 hb_ot_color_layer_t *layers /* OUT. May be NULL. */)
268 {
269 return face->table.COLR->get_glyph_layers (glyph, start_offset, layer_count, layers);
270 }
271
272
273 /*
274 * SVG
275 */
276
277 /**
278 * hb_ot_color_has_svg:
279 * @face: #hb_face_t to work upon.
280 *
281 * Tests whether a face includes any `SVG` glyph images.
282 *
283 * Return value: `true` if data found, `false` otherwise.
284 *
285 * Since: 2.1.0
286 */
287 hb_bool_t
hb_ot_color_has_svg(hb_face_t * face)288 hb_ot_color_has_svg (hb_face_t *face)
289 {
290 return face->table.SVG->has_data ();
291 }
292
293 /**
294 * hb_ot_color_glyph_reference_svg:
295 * @face: #hb_face_t to work upon
296 * @glyph: a svg glyph index
297 *
298 * Fetches the SVG document for a glyph. The blob may be either plain text or gzip-encoded.
299 *
300 * If the glyph has no SVG document, the singleton empty blob is returned.
301 *
302 * Return value: (transfer full): An #hb_blob_t containing the SVG document of the glyph, if available
303 *
304 * Since: 2.1.0
305 */
306 hb_blob_t *
hb_ot_color_glyph_reference_svg(hb_face_t * face,hb_codepoint_t glyph)307 hb_ot_color_glyph_reference_svg (hb_face_t *face, hb_codepoint_t glyph)
308 {
309 return face->table.SVG->reference_blob_for_glyph (glyph);
310 }
311
312
313 /*
314 * PNG: CBDT or sbix
315 */
316
317 /**
318 * hb_ot_color_has_png:
319 * @face: #hb_face_t to work upon
320 *
321 * Tests whether a face has PNG glyph images (either in `CBDT` or `sbix` tables).
322 *
323 * Return value: `true` if data found, `false` otherwise
324 *
325 * Since: 2.1.0
326 */
327 hb_bool_t
hb_ot_color_has_png(hb_face_t * face)328 hb_ot_color_has_png (hb_face_t *face)
329 {
330 return face->table.CBDT->has_data () || face->table.sbix->has_data ();
331 }
332
333 /**
334 * hb_ot_color_glyph_reference_png:
335 * @font: #hb_font_t to work upon
336 * @glyph: a glyph index
337 *
338 * Fetches the PNG image for a glyph. This function takes a font object, not a face object,
339 * as input. To get an optimally sized PNG blob, the PPEM values must be set on the @font
340 * object. If PPEM is unset, the blob returned will be the largest PNG available.
341 *
342 * If the glyph has no PNG image, the singleton empty blob is returned.
343 *
344 * Return value: (transfer full): An #hb_blob_t containing the PNG image for the glyph, if available
345 *
346 * Since: 2.1.0
347 */
348 hb_blob_t *
hb_ot_color_glyph_reference_png(hb_font_t * font,hb_codepoint_t glyph)349 hb_ot_color_glyph_reference_png (hb_font_t *font, hb_codepoint_t glyph)
350 {
351 hb_blob_t *blob = hb_blob_get_empty ();
352
353 if (font->face->table.sbix->has_data ())
354 blob = font->face->table.sbix->reference_png (font, glyph, nullptr, nullptr, nullptr);
355
356 if (!blob->length && font->face->table.CBDT->has_data ())
357 blob = font->face->table.CBDT->reference_png (font, glyph);
358
359 return blob;
360 }
361
362
363 #endif
364