/* * Copyright © 2018 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. */ #ifndef HB_OT_COLOR_COLR_TABLE_HH #define HB_OT_COLOR_COLR_TABLE_HH #include "hb-open-type-private.hh" /* * Color Palette * http://www.microsoft.com/typography/otspec/colr.htm */ #define HB_OT_TAG_COLR HB_TAG('C','O','L','R') namespace OT { struct LayerRecord { friend struct COLR; inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this)); } protected: GlyphID gID; /* Glyph ID of layer glyph */ HBUINT16 paletteIndex; /* Index value to use with a selected color palette */ public: DEFINE_SIZE_STATIC (4); }; struct BaseGlyphRecord { friend struct COLR; inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this)); } protected: GlyphID gID; /* Glyph ID of reference glyph */ HBUINT16 firstLayerIndex; /* Index to the layer record */ HBUINT16 numLayers; /* Number of color layers associated with this glyph */ public: DEFINE_SIZE_STATIC (6); }; struct COLR { static const hb_tag_t tableTag = HB_OT_TAG_COLR; inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); if (!(c->check_struct (this) && c->check_array ((const void*) &layerRecordsOffsetZ, sizeof (LayerRecord), numLayerRecords) && c->check_array ((const void*) &baseGlyphRecordsZ, sizeof (BaseGlyphRecord), numBaseGlyphRecords))) return_trace (false); const BaseGlyphRecord* base_glyph_records = &baseGlyphRecordsZ (this); for (unsigned int i = 0; i < numBaseGlyphRecords; ++i) if (base_glyph_records[i].firstLayerIndex + base_glyph_records[i].numLayers > numLayerRecords) return_trace (false); return_trace (true); } inline bool get_base_glyph_record ( hb_codepoint_t glyph_id, unsigned int &first_layer, unsigned int &num_layers) const { const BaseGlyphRecord* base_glyph_records = &baseGlyphRecordsZ (this); unsigned int min = 0, max = numBaseGlyphRecords - 1; while (min <= max) { unsigned int mid = (min + max) / 2; hb_codepoint_t gID = base_glyph_records[mid].gID; if (gID > glyph_id) max = mid - 1; else if (gID < glyph_id) min = mid + 1; else { first_layer = base_glyph_records[mid].firstLayerIndex; num_layers = base_glyph_records[mid].numLayers; return true; } } return false; } inline void get_layer_record (int layer, hb_codepoint_t &glyph_id, unsigned int &palette_index) const { const LayerRecord* records = &layerRecordsOffsetZ (this); glyph_id = records[layer].gID; palette_index = records[layer].paletteIndex; } protected: HBUINT16 version; /* Table version number */ HBUINT16 numBaseGlyphRecords; /* Number of Base Glyph Records */ LOffsetTo baseGlyphRecordsZ; /* Offset to Base Glyph records. */ LOffsetTo layerRecordsOffsetZ; /* Offset to Layer Records */ HBUINT16 numLayerRecords; /* Number of Layer Records */ public: DEFINE_SIZE_STATIC (14); }; } /* namespace OT */ #endif /* HB_OT_COLOR_COLR_TABLE_HH */