2008-01-24 09:11:09 +01:00
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/*
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* Copyright (C) 2007,2008 Red Hat, Inc.
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*
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* This is part of HarfBuzz, an OpenType Layout engine 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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* Red Hat Author(s): Behdad Esfahbod
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*/
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#define HB_OT_LAYOUT_CC
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#include "hb-ot-layout.h"
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#include "hb-ot-layout-private.h"
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#include "hb-ot-layout-open-private.h"
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#include "hb-ot-layout-gdef-private.h"
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#include "hb-ot-layout-gsub-private.h"
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#include <stdlib.h>
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2008-01-24 12:03:45 +01:00
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#include <string.h>
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2008-01-24 09:11:09 +01:00
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HB_OT_Layout *
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hb_ot_layout_create (const char *font_data,
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int face_index)
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{
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HB_OT_Layout *layout = (HB_OT_Layout *) calloc (1, sizeof (HB_OT_Layout));
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2008-01-24 09:54:09 +01:00
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const OpenTypeFontFile &font = OpenTypeFontFile::get_for_data (font_data);
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const OpenTypeFontFace &face = font.get_face (face_index);
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2008-01-24 09:11:09 +01:00
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2008-01-24 09:54:09 +01:00
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layout->gdef = &GDEF::get_for_data (font.get_table_data (face.get_table (GDEF::Tag)));
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layout->gsub = &GSUB::get_for_data (font.get_table_data (face.get_table (GSUB::Tag)));
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//layout->gpos = &GPOS::get_for_data (font.get_table_data (face.get_table (GPOS::Tag)));
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2008-01-24 09:11:09 +01:00
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return layout;
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}
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void
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hb_ot_layout_destroy (HB_OT_Layout *layout)
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{
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free (layout);
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}
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2008-01-24 12:03:45 +01:00
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static hb_ot_layout_glyph_properties_t
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_hb_ot_layout_get_glyph_properties (HB_OT_Layout *layout,
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hb_ot_layout_glyph_t glyph)
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2008-01-24 09:54:09 +01:00
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{
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2008-01-24 12:03:45 +01:00
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hb_ot_layout_class_t klass;
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/* TODO old harfbuzz doesn't always parse mark attachments as it says it was
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* introduced without a version bump, so it may not be safe */
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klass = layout->gdef->get_mark_attachment_type (glyph);
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if (klass)
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return klass << 8;
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klass = layout->gdef->get_glyph_class (glyph);
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2008-01-24 09:54:09 +01:00
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2008-01-24 12:03:45 +01:00
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if (!klass && glyph < layout->new_gdef.len)
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klass = layout->new_gdef.klasses[glyph];
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switch (klass) {
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default:
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case GDEF::UnclassifiedGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED;
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case GDEF::BaseGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH;
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case GDEF::LigatureGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE;
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case GDEF::MarkGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_MARK;
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case GDEF::ComponentGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT;
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}
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2008-01-24 09:54:09 +01:00
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}
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2008-01-24 09:11:09 +01:00
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2008-01-24 12:03:45 +01:00
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hb_ot_layout_glyph_class_t
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hb_ot_layout_get_glyph_class (HB_OT_Layout *layout,
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hb_ot_layout_glyph_t glyph)
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2008-01-24 09:54:09 +01:00
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{
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2008-01-24 12:03:45 +01:00
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hb_ot_layout_glyph_properties_t properties;
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hb_ot_layout_class_t klass;
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2008-01-24 09:54:09 +01:00
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2008-01-24 12:03:45 +01:00
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properties = _hb_ot_layout_get_glyph_properties (layout, glyph);
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if (properties & 0xFF)
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return HB_OT_LAYOUT_GLYPH_CLASS_MARK;
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return (hb_ot_layout_glyph_class_t) properties;
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2008-01-24 09:54:09 +01:00
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}
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2008-01-24 12:03:45 +01:00
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void
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hb_ot_layout_set_glyph_class (HB_OT_Layout *layout,
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hb_ot_layout_glyph_t glyph,
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hb_ot_layout_glyph_class_t klass)
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{
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/* TODO optimize this, similar to old harfbuzz code for example */
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/* TODO our semantics are a bit different from old harfbuzz code too */
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hb_ot_layout_class_t gdef_klass;
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int len = layout->new_gdef.len;
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if (glyph >= len) {
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int new_len;
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uint8_t *new_klasses;
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new_len = len == 0 ? 120 : 2 * len;
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if (new_len > 65535)
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new_len = 65535;
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new_klasses = (uint8_t *) realloc (layout->new_gdef.klasses, new_len * sizeof (uint8_t));
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if (G_UNLIKELY (!new_klasses))
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return;
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memset (new_klasses + len, 0, new_len - len);
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layout->new_gdef.klasses = new_klasses;
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layout->new_gdef.len = new_len;
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}
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switch (klass) {
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default:
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case HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED: gdef_klass = GDEF::UnclassifiedGlyph; break;
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case HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH: gdef_klass = GDEF::BaseGlyph; break;
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case HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE: gdef_klass = GDEF::LigatureGlyph; break;
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case HB_OT_LAYOUT_GLYPH_CLASS_MARK: gdef_klass = GDEF::MarkGlyph; break;
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case HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT: gdef_klass = GDEF::ComponentGlyph; break;
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}
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layout->new_gdef.klasses[glyph] = gdef_klass;
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return;
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}
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