HarfBuzz text shaping engine
http://harfbuzz.github.io/
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388 lines
12 KiB
388 lines
12 KiB
/* |
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* Copyright © 2011,2014 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod, Roozbeh Pournader |
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*/ |
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#include "hb.hh" |
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#ifndef HB_NO_OT_FONT |
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#include "hb-ot.h" |
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#include "hb-font.hh" |
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#include "hb-machinery.hh" |
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#include "hb-ot-face.hh" |
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#include "hb-ot-cmap-table.hh" |
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#include "hb-ot-glyf-table.hh" |
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#include "hb-ot-cff1-table.hh" |
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#include "hb-ot-cff2-table.hh" |
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#include "hb-ot-hmtx-table.hh" |
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#include "hb-ot-os2-table.hh" |
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#include "hb-ot-post-table.hh" |
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#include "hb-ot-stat-table.hh" // Just so we compile it; unused otherwise. |
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#include "hb-ot-vorg-table.hh" |
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#include "hb-ot-color-cbdt-table.hh" |
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#include "hb-ot-color-sbix-table.hh" |
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/** |
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* SECTION:hb-ot-font |
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* @title: hb-ot-font |
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* @short_description: OpenType font implementation |
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* @include: hb-ot.h |
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* |
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* Functions for using OpenType fonts with hb_shape(). Note that fonts returned |
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* by hb_font_create() default to using these functions, so most clients would |
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* never need to call these functions directly. |
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**/ |
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static hb_bool_t |
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hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED, |
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void *font_data, |
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hb_codepoint_t unicode, |
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hb_codepoint_t *glyph, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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return ot_face->cmap->get_nominal_glyph (unicode, glyph); |
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} |
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static unsigned int |
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hb_ot_get_nominal_glyphs (hb_font_t *font HB_UNUSED, |
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void *font_data, |
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unsigned int count, |
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const hb_codepoint_t *first_unicode, |
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unsigned int unicode_stride, |
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hb_codepoint_t *first_glyph, |
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unsigned int glyph_stride, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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return ot_face->cmap->get_nominal_glyphs (count, |
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first_unicode, unicode_stride, |
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first_glyph, glyph_stride); |
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} |
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static hb_bool_t |
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hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED, |
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void *font_data, |
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hb_codepoint_t unicode, |
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hb_codepoint_t variation_selector, |
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hb_codepoint_t *glyph, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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return ot_face->cmap->get_variation_glyph (unicode, variation_selector, glyph); |
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} |
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static void |
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hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data, |
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unsigned count, |
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const hb_codepoint_t *first_glyph, |
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unsigned glyph_stride, |
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hb_position_t *first_advance, |
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unsigned advance_stride, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx; |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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*first_advance = font->em_scale_x (hmtx.get_advance (*first_glyph, font)); |
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); |
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride); |
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} |
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} |
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#ifndef HB_NO_VERTICAL |
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static void |
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hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data, |
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unsigned count, |
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const hb_codepoint_t *first_glyph, |
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unsigned glyph_stride, |
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hb_position_t *first_advance, |
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unsigned advance_stride, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx; |
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if (vmtx.has_data ()) |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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*first_advance = font->em_scale_y (-(int) vmtx.get_advance (*first_glyph, font)); |
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); |
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride); |
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} |
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else |
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{ |
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hb_font_extents_t font_extents; |
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font->get_h_extents_with_fallback (&font_extents); |
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hb_position_t advance = -(font_extents.ascender - font_extents.descender); |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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*first_advance = advance; |
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride); |
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride); |
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} |
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} |
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} |
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#endif |
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#ifndef HB_NO_VERTICAL |
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static hb_bool_t |
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hb_ot_get_glyph_v_origin (hb_font_t *font, |
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void *font_data, |
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hb_codepoint_t glyph, |
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hb_position_t *x, |
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hb_position_t *y, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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*x = font->get_glyph_h_advance (glyph) / 2; |
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const OT::VORG &VORG = *ot_face->VORG; |
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if (VORG.has_data ()) |
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{ |
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*y = font->em_scale_y (VORG.get_y_origin (glyph)); |
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return true; |
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} |
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hb_glyph_extents_t extents = {0}; |
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if (ot_face->glyf->get_extents (font, glyph, &extents)) |
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{ |
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if (ot_face->vmtx->has_data ()) |
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{ |
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const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx; |
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hb_position_t tsb = vmtx.get_side_bearing (font, glyph); |
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*y = extents.y_bearing + font->em_scale_y (tsb); |
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return true; |
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} |
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hb_font_extents_t font_extents; |
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font->get_h_extents_with_fallback (&font_extents); |
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hb_position_t advance = font_extents.ascender - font_extents.descender; |
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int diff = advance - -extents.height; |
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*y = extents.y_bearing + (diff >> 1); |
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return true; |
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} |
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hb_font_extents_t font_extents; |
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font->get_h_extents_with_fallback (&font_extents); |
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*y = font_extents.ascender; |
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return true; |
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} |
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#endif |
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static hb_bool_t |
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hb_ot_get_glyph_extents (hb_font_t *font, |
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void *font_data, |
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hb_codepoint_t glyph, |
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hb_glyph_extents_t *extents, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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#if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR) |
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if (ot_face->sbix->get_extents (font, glyph, extents)) return true; |
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#endif |
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if (ot_face->glyf->get_extents (font, glyph, extents)) return true; |
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#ifndef HB_NO_OT_FONT_CFF |
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if (ot_face->cff1->get_extents (font, glyph, extents)) return true; |
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if (ot_face->cff2->get_extents (font, glyph, extents)) return true; |
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#endif |
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#if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR) |
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if (ot_face->CBDT->get_extents (font, glyph, extents)) return true; |
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#endif |
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// TODO Hook up side-bearings variations. |
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return false; |
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} |
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#ifndef HB_NO_OT_FONT_GLYPH_NAMES |
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static hb_bool_t |
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hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED, |
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void *font_data, |
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hb_codepoint_t glyph, |
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char *name, unsigned int size, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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if (ot_face->post->get_glyph_name (glyph, name, size)) return true; |
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#ifndef HB_NO_OT_FONT_CFF |
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if (ot_face->cff1->get_glyph_name (glyph, name, size)) return true; |
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#endif |
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return false; |
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} |
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static hb_bool_t |
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hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED, |
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void *font_data, |
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const char *name, int len, |
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hb_codepoint_t *glyph, |
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void *user_data HB_UNUSED) |
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{ |
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const hb_ot_face_t *ot_face = (const hb_ot_face_t *) font_data; |
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if (ot_face->post->get_glyph_from_name (name, len, glyph)) return true; |
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#ifndef HB_NO_OT_FONT_CFF |
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if (ot_face->cff1->get_glyph_from_name (name, len, glyph)) return true; |
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#endif |
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return false; |
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} |
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#endif |
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static hb_bool_t |
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hb_ot_get_font_h_extents (hb_font_t *font, |
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void *font_data HB_UNUSED, |
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hb_font_extents_t *metrics, |
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void *user_data HB_UNUSED) |
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{ |
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return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, &metrics->ascender) && |
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_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER, &metrics->descender) && |
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_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP, &metrics->line_gap); |
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} |
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#ifndef HB_NO_VERTICAL |
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static hb_bool_t |
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hb_ot_get_font_v_extents (hb_font_t *font, |
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void *font_data HB_UNUSED, |
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hb_font_extents_t *metrics, |
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void *user_data HB_UNUSED) |
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{ |
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return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_ASCENDER, &metrics->ascender) && |
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_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_DESCENDER, &metrics->descender) && |
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_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_LINE_GAP, &metrics->line_gap); |
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} |
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#endif |
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#ifndef HB_NO_DRAW |
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static void |
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hb_ot_get_glyph_shape (hb_font_t *font, |
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void *font_data HB_UNUSED, |
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hb_codepoint_t glyph, |
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hb_draw_funcs_t *draw_funcs, void *draw_data, |
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void *user_data) |
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{ |
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hb_draw_session_t draw_session (draw_funcs, draw_data, font->slant_xy); |
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if (font->face->table.glyf->get_path (font, glyph, draw_session)) return; |
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#ifndef HB_NO_CFF |
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if (font->face->table.cff1->get_path (font, glyph, draw_session)) return; |
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if (font->face->table.cff2->get_path (font, glyph, draw_session)) return; |
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#endif |
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} |
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#endif |
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static inline void free_static_ot_funcs (); |
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static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t> |
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{ |
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static hb_font_funcs_t *create () |
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{ |
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hb_font_funcs_t *funcs = hb_font_funcs_create (); |
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hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr); |
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hb_font_funcs_set_nominal_glyphs_func (funcs, hb_ot_get_nominal_glyphs, nullptr, nullptr); |
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hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr); |
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hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr); |
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hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ot_get_glyph_h_advances, nullptr, nullptr); |
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//hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr); |
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#ifndef HB_NO_VERTICAL |
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hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr); |
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hb_font_funcs_set_glyph_v_advances_func (funcs, hb_ot_get_glyph_v_advances, nullptr, nullptr); |
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hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr); |
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#endif |
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#ifndef HB_NO_DRAW |
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hb_font_funcs_set_glyph_shape_func (funcs, hb_ot_get_glyph_shape, nullptr, nullptr); |
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#endif |
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hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr); |
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//hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr); |
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#ifndef HB_NO_OT_FONT_GLYPH_NAMES |
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hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr); |
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hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr); |
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#endif |
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hb_font_funcs_make_immutable (funcs); |
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hb_atexit (free_static_ot_funcs); |
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return funcs; |
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} |
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} static_ot_funcs; |
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static inline |
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void free_static_ot_funcs () |
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{ |
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static_ot_funcs.free_instance (); |
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} |
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static hb_font_funcs_t * |
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_hb_ot_get_font_funcs () |
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{ |
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return static_ot_funcs.get_unconst (); |
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} |
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/** |
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* hb_ot_font_set_funcs: |
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* @font: #hb_font_t to work upon |
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* |
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* Sets the font functions to use when working with @font. |
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* |
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* Since: 0.9.28 |
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**/ |
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void |
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hb_ot_font_set_funcs (hb_font_t *font) |
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{ |
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hb_font_set_funcs (font, |
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_hb_ot_get_font_funcs (), |
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&font->face->table, |
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nullptr); |
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} |
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#ifndef HB_NO_VAR |
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int |
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_glyf_get_side_bearing_var (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical) |
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{ |
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return font->face->table.glyf->get_side_bearing_var (font, glyph, is_vertical); |
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} |
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unsigned |
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_glyf_get_advance_var (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical) |
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{ |
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return font->face->table.glyf->get_advance_var (font, glyph, is_vertical); |
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} |
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#endif |
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#endif
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