141 lines
4.2 KiB
C++
141 lines
4.2 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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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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public:
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GlyphID glyphId; /* Glyph ID of layer glyph */
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Index colorIdx; /* Index value to use with a
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* selected color palette.
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* An index value of 0xFFFF
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* is a special case indicating
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* that the text foreground
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* color (defined by a
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* higher-level client) should
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* be used and shall not be
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* treated as actual index
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* into CPAL ColorRecord array. */
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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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int cmp (hb_codepoint_t g) const
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{ return g < glyphId ? -1 : g > glyphId ? 1 : 0; }
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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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public:
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GlyphID glyphId; /* Glyph ID of reference glyph */
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HBUINT16 firstLayerIdx; /* Index (from beginning of
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* the Layer Records) to the
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* layer record. There will be
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* numLayers consecutive entries
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* for this base glyph. */
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HBUINT16 numLayers; /* Number of color layers
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* 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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struct COLR
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{
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enum { tableTag = HB_OT_TAG_COLR };
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bool has_data () const { return numBaseGlyphs; }
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unsigned int get_glyph_layers (hb_codepoint_t glyph,
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unsigned int start_offset,
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unsigned int *count, /* IN/OUT. May be NULL. */
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hb_ot_color_layer_t *layers /* OUT. May be NULL. */) const
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{
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const BaseGlyphRecord &record = (this+baseGlyphsZ).bsearch (numBaseGlyphs, glyph);
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hb_array_t<const LayerRecord> all_layers ((this+layersZ).arrayZ, numLayers);
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hb_array_t<const LayerRecord> glyph_layers = all_layers.sub_array (record.firstLayerIdx,
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record.numLayers);
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if (count)
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{
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hb_array_t<const LayerRecord> segment_layers = glyph_layers.sub_array (start_offset, *count);
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*count = segment_layers.len;
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for (unsigned int i = 0; i < segment_layers.len; i++)
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{
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layers[i].glyph = segment_layers.arrayZ[i].glyphId;
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layers[i].color_index = segment_layers.arrayZ[i].colorIdx;
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}
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}
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return glyph_layers.len;
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}
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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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protected:
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HBUINT16 version; /* Table version number (starts at 0). */
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HBUINT16 numBaseGlyphs; /* Number of Base Glyph Records. */
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LOffsetTo<SortedUnsizedArrayOf<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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