harfbuzz/src/hb-ot-colr-table.hh

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/*
* 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_COLR_TABLE_HH
#define HB_OT_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;
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inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
protected:
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GlyphID gID; /* Glyph ID of layer glyph */
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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
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{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
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}
protected:
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GlyphID gID; /* Glyph ID of reference glyph */
HBUINT16 firstLayerIndex; /* Index to the layer record */
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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*) &layerRecordsOffset, sizeof (LayerRecord), numLayerRecords) &&
c->check_array ((const void*) &baseGlyphRecords, sizeof (BaseGlyphRecord), numBaseGlyphRecords)))
return_trace (false);
const BaseGlyphRecord* base_glyph_records = &baseGlyphRecords (this);
for (unsigned int i = 0; i < numBaseGlyphRecords; ++i)
if (base_glyph_records[i].firstLayerIndex +
base_glyph_records[i].numLayers > numLayerRecords)
return_trace (false);
/* XXX values of LayerRecord structs should be sanitized */
return_trace (true);
}
inline const bool get_base_glyph_record (
hb_codepoint_t glyph_id, unsigned int &first_layer, unsigned int &num_layers) const
{
/* TODO replace with bsearch */
const BaseGlyphRecord* base_glyph_records = &baseGlyphRecords (this);
unsigned int records = numBaseGlyphRecords;
for (unsigned int i = 0; i < records; ++i)
if (base_glyph_records[i].gID == glyph_id)
{
first_layer = base_glyph_records[i].firstLayerIndex;
num_layers = base_glyph_records[i].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 = &layerRecordsOffset (this);
glyph_id = records[layer].gID;
palette_index = records[layer].paletteIndex;
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}
protected:
HBUINT16 version; /* Table version number */
HBUINT16 numBaseGlyphRecords; /* Number of Base Glyph Records */
LOffsetTo<BaseGlyphRecord>
baseGlyphRecords; /* Offset to Base Glyph records. */
LOffsetTo<LayerRecord>
layerRecordsOffset; /* Offset to Layer Records */
HBUINT16 numLayerRecords; /* Number of Layer Records */
public:
DEFINE_SIZE_STATIC (14);
};
} /* namespace OT */
#endif /* HB_OT_COLR_TABLE_HH */