| /* |
| * 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<BaseGlyphRecord> |
| baseGlyphRecordsZ; /* Offset to Base Glyph records. */ |
| LOffsetTo<LayerRecord> |
| 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 */ |