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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| * Copyright © 2019 Ebrahim Byagowi | ||
| * | ||
| * This is part of HarfBuzz, a text shaping library. | ||
| * | ||
| * Permission is hereby granted, without written agreement and without | ||
| * license or royalty fees, to use, copy, modify, and distribute this | ||
| * software and its documentation for any purpose, provided that the | ||
| * above copyright notice and the following two paragraphs appear in | ||
| * all copies of this software. | ||
| * | ||
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | ||
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | ||
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | ||
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | ||
| * DAMAGE. | ||
| * | ||
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | ||
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | ||
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | ||
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | ||
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | ||
| */ | ||
|
|
||
| #include "hb.hh" | ||
|
|
||
| #ifndef HB_NO_STYLE | ||
|
|
||
| #include "hb-aat-fdsc-table.hh" | ||
| #include "hb-ot-var-avar-table.hh" | ||
| #include "hb-ot-var-fvar-table.hh" | ||
| #include "hb-ot-stat-table.hh" | ||
| #include "hb-ot-os2-table.hh" | ||
| #include "hb-ot-head-table.hh" | ||
| #include "hb-ot-post-table.hh" | ||
| #include "hb-ot-face.hh" | ||
|
|
||
| /** | ||
| * hb_style_get_value: | ||
| * @font: a #hb_font_t object. | ||
| * @style_tag: a style tag. | ||
| * | ||
| * Searches variation axes of a hb_font_t object for a specific axis first, | ||
| * if not set, then tries to get default style values from different | ||
| * tables of the font. | ||
| * | ||
| * Returns: Corresponding axis or default value to a style tag. | ||
| * | ||
| * Since: REPLACEME | ||
| **/ | ||
| float | ||
| hb_style_get_value (hb_font_t *font, hb_style_tag_t style_tag) | ||
| { | ||
| hb_face_t *face = font->face; | ||
|
|
||
| #ifndef HB_NO_VAR | ||
| hb_ot_var_axis_info_t axis; | ||
| if (hb_ot_var_find_axis_info (face, style_tag, &axis)) | ||
| { | ||
| if (axis.axis_index < font->num_coords) return font->design_coords[axis.axis_index]; | ||
| /* If a face is variable, fvar's default_value is better than STAT records */ | ||
| return axis.default_value; | ||
| } | ||
| #endif | ||
|
|
||
| if (style_tag == HB_STYLE_TAG_OPTICAL_SIZE && font->ptem) | ||
| return font->ptem; | ||
|
|
||
| /* STAT */ | ||
| float value; | ||
| if (face->table.STAT->get_value (style_tag, &value)) | ||
| return value; | ||
|
|
||
| /* Check Apple's fdsc as OS2 table is optional in AAT */ | ||
| const AAT::FontDescriptor &descriptor = face->table.fdsc->get_descriptor (style_tag); | ||
| if (descriptor.has_data ()) | ||
| { | ||
| float value = descriptor.get_value (); | ||
| /* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6fdsc.html */ | ||
| /* Percent weight relative to regular weight. */ | ||
| if (style_tag == HB_STYLE_TAG_WEIGHT) value *= 400.f; | ||
| /* Percent width relative to regular width. */ | ||
| if (style_tag == HB_STYLE_TAG_WIDTH) value *= 100.f; | ||
| return value; | ||
| } | ||
|
|
||
| switch ((unsigned) style_tag) | ||
| { | ||
| case HB_STYLE_TAG_ITALIC: | ||
| return face->table.OS2->is_italic () || face->table.head->is_italic () ? 1 : 0; | ||
| case HB_STYLE_TAG_OPTICAL_SIZE: | ||
| { | ||
| unsigned int lower, upper; | ||
| return face->table.OS2->v5 ().get_optical_size (&lower, &upper) | ||
| ? (float) (lower + upper) / 2.f | ||
| : 12.f; | ||
| } | ||
| case HB_STYLE_TAG_SLANT: | ||
| return face->table.post->table->italicAngle.to_float (); | ||
| case HB_STYLE_TAG_WIDTH: | ||
| return face->table.OS2->has_data () | ||
| ? face->table.OS2->get_width () | ||
| : (face->table.head->is_condensed () ? 75 : 100); | ||
| case HB_STYLE_TAG_WEIGHT: | ||
| return face->table.OS2->has_data () | ||
| ? face->table.OS2->usWeightClass | ||
| : (face->table.head->is_bold () ? 700 : 400); | ||
| default: | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| #endif |
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