Behdad Esfahbod
11 years ago
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343a0e4e74
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903648437c
10 changed files with 283 additions and 53 deletions
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/*
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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-private.hh" |
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#include "hb-ot.h" |
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#include "hb-font-private.hh" |
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#include "hb-ot-hhea-table.hh" |
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#include "hb-ot-hmtx-table.hh" |
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struct hb_ot_font_t |
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{ |
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unsigned int num_glyphs; |
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unsigned int num_hmetrics; |
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const OT::hmtx *hmtx; |
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hb_blob_t *hmtx_blob; |
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}; |
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static hb_ot_font_t * |
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_hb_ot_font_create (hb_font_t *font) |
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{ |
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hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t)); |
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if (unlikely (!ot_font)) |
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return NULL; |
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ot_font->num_glyphs = font->face->get_num_glyphs (); |
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{ |
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hb_blob_t *hhea_blob = OT::Sanitizer<OT::hhea>::sanitize (font->face->reference_table (HB_OT_TAG_hhea)); |
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const OT::hhea *hhea = OT::Sanitizer<OT::hhea>::lock_instance (hhea_blob); |
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ot_font->num_hmetrics = hhea->numberOfHMetrics; |
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hb_blob_destroy (hhea_blob); |
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} |
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ot_font->hmtx_blob = OT::Sanitizer<OT::hmtx>::sanitize (font->face->reference_table (HB_OT_TAG_hmtx)); |
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if (unlikely (!ot_font->num_hmetrics || |
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2 * (ot_font->num_hmetrics + ot_font->num_glyphs) < hb_blob_get_length (ot_font->hmtx_blob))) |
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{ |
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hb_blob_destroy (ot_font->hmtx_blob); |
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free (ot_font); |
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return NULL; |
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} |
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ot_font->hmtx = OT::Sanitizer<OT::hmtx>::lock_instance (ot_font->hmtx_blob); |
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return ot_font; |
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} |
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static void |
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_hb_ot_font_destroy (hb_ot_font_t *ot_font) |
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{ |
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hb_blob_destroy (ot_font->hmtx_blob); |
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free (ot_font); |
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} |
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static hb_bool_t |
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hb_ot_get_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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#if 0 |
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FT_Face ft_face = (FT_Face) font_data; |
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#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX |
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if (unlikely (variation_selector)) { |
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*glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector); |
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return *glyph != 0; |
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} |
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#endif |
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*glyph = FT_Get_Char_Index (ft_face, unicode); |
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return *glyph != 0; |
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#endif |
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return true; |
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} |
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static hb_position_t |
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hb_ot_get_glyph_h_advance (hb_font_t *font, |
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void *font_data, |
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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_font_t *ot_font = (const hb_ot_font_t *) font_data; |
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if (unlikely (glyph >= ot_font->num_glyphs)) |
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return 0; /* Maybe better to return notdef's advance instead? */ |
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if (glyph >= ot_font->num_hmetrics) |
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glyph = ot_font->num_hmetrics - 1; |
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return font->em_scale_x (ot_font->hmtx->longHorMetric[glyph].advanceWidth); |
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} |
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static hb_position_t |
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hb_ot_get_glyph_v_advance (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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void *user_data HB_UNUSED) |
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{ |
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/* TODO */ |
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return 0; |
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} |
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static hb_bool_t |
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hb_ot_get_glyph_h_origin (hb_font_t *font HB_UNUSED, |
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void *font_data HB_UNUSED, |
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hb_codepoint_t glyph HB_UNUSED, |
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hb_position_t *x HB_UNUSED, |
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hb_position_t *y HB_UNUSED, |
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void *user_data HB_UNUSED) |
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{ |
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/* We always work in the horizontal coordinates. */ |
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return true; |
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} |
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static hb_bool_t |
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hb_ot_get_glyph_v_origin (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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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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/* TODO */ |
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return false; |
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} |
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static hb_position_t |
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hb_ot_get_glyph_h_kerning (hb_font_t *font, |
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void *font_data, |
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hb_codepoint_t left_glyph, |
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hb_codepoint_t right_glyph, |
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void *user_data HB_UNUSED) |
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{ |
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/* TODO */ |
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return 0; |
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} |
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static hb_position_t |
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hb_ot_get_glyph_v_kerning (hb_font_t *font HB_UNUSED, |
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void *font_data HB_UNUSED, |
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hb_codepoint_t top_glyph HB_UNUSED, |
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hb_codepoint_t bottom_glyph HB_UNUSED, |
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void *user_data HB_UNUSED) |
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{ |
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return 0; |
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} |
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static hb_bool_t |
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hb_ot_get_glyph_extents (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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hb_glyph_extents_t *extents, |
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void *user_data HB_UNUSED) |
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{ |
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/* TODO */ |
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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_contour_point (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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unsigned int point_index, |
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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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/* TODO */ |
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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_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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/* TODO */ |
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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, /* -1 means nul-terminated */ |
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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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/* TODO */ |
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return false; |
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} |
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static hb_font_funcs_t * |
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_hb_ot_get_font_funcs (void) |
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{ |
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static const hb_font_funcs_t ot_ffuncs = { |
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HB_OBJECT_HEADER_STATIC, |
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true, /* immutable */ |
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{ |
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#define HB_FONT_FUNC_IMPLEMENT(name) hb_ot_get_##name, |
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HB_FONT_FUNCS_IMPLEMENT_CALLBACKS |
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#undef HB_FONT_FUNC_IMPLEMENT |
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} |
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}; |
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return const_cast<hb_font_funcs_t *> (&ot_ffuncs); |
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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_ot_font_t *ot_font = _hb_ot_font_create (font); |
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if (unlikely (!ot_font)) |
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return; |
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hb_font_set_funcs (font, |
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_hb_ot_get_font_funcs (), |
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ot_font, |
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(hb_destroy_func_t) _hb_ot_font_destroy); |
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} |
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