145 lines
4.0 KiB
C++
145 lines
4.0 KiB
C++
/*
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* Copyright © 2018 Ebrahim Byagowi
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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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#ifndef HB_OT_COLOR_COLR_TABLE_HH
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#define HB_OT_COLOR_COLR_TABLE_HH
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#include "hb-open-type.hh"
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/*
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* COLR -- Color
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* https://docs.microsoft.com/en-us/typography/opentype/spec/colr
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*/
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#define HB_OT_TAG_COLR HB_TAG('C','O','L','R')
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namespace OT {
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struct LayerRecord
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{
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friend struct COLR;
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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protected:
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GlyphID glyphid; /* Glyph ID of layer glyph */
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HBUINT16 colorIdx; /* Index value to use with a selected color palette */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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struct BaseGlyphRecord
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{
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friend struct COLR;
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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inline int cmp (hb_codepoint_t g) const {
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return g < glyphid ? -1 : g > glyphid ? 1 : 0;
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}
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protected:
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GlyphID glyphid; /* Glyph ID of reference glyph */
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HBUINT16 firstLayerIdx; /* Index to the layer record */
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HBUINT16 numLayers; /* Number of color layers associated with this glyph */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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static int compare_bgr (const void *pa, const void *pb)
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{
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const hb_codepoint_t *a = (const hb_codepoint_t *) pa;
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const BaseGlyphRecord *b = (const BaseGlyphRecord *) pb;
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return b->cmp (*a);
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}
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struct COLR
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{
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static const hb_tag_t tableTag = HB_OT_TAG_COLR;
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) &&
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(this+baseGlyphsZ).sanitize (c, numBaseGlyphs) &&
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(this+layersZ).sanitize (c, numLayers)));
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}
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inline bool get_base_glyph_record (hb_codepoint_t glyph_id,
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unsigned int *first_layer /* OUT */,
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unsigned int *num_layers /* OUT */) const
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{
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const BaseGlyphRecord* record;
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record = (BaseGlyphRecord *) bsearch (&glyph_id, &(this+baseGlyphsZ), numBaseGlyphs,
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sizeof (BaseGlyphRecord), compare_bgr);
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if (unlikely (!record))
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return false;
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*first_layer = record->firstLayerIdx;
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*num_layers = record->numLayers;
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return true;
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}
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inline bool get_layer_record (unsigned int record,
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hb_codepoint_t *glyph_id /* OUT */,
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unsigned int *palette_index /* OUT */) const
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{
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if (unlikely (record >= numLayers))
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{
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*glyph_id = 0;
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*palette_index = 0xFFFF;
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return false;
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}
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const LayerRecord &layer = (this+layersZ)[record];
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*glyph_id = layer.glyphid;
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*palette_index = layer.colorIdx;
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return true;
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}
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protected:
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HBUINT16 version; /* Table version number */
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HBUINT16 numBaseGlyphs; /* Number of Base Glyph Records */
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LOffsetTo<UnsizedArrayOf<BaseGlyphRecord>, false>
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baseGlyphsZ; /* Offset to Base Glyph records. */
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LOffsetTo<UnsizedArrayOf<LayerRecord>, false>
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layersZ; /* Offset to Layer Records */
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HBUINT16 numLayers; /* Number of Layer Records */
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public:
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DEFINE_SIZE_STATIC (14);
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};
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} /* namespace OT */
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#endif /* HB_OT_COLOR_COLR_TABLE_HH */
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