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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_COLOR_COLR_TABLE_HH
#define HB_OT_COLOR_COLR_TABLE_HH
#include "hb-open-type.hh"
/*
* COLR -- Color
* https://docs.microsoft.com/en-us/typography/opentype/spec/colr
*/
#define HB_OT_TAG_COLR HB_TAG('C','O','L','R')
namespace OT {
struct LayerRecord
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
public:
GlyphID glyphId; /* Glyph ID of layer glyph */
HBUINT16 colorIdx; /* Index value to use with a
* selected color palette.
* An index value of 0xFFFF
* is a special case indicating
* that the text foreground
* color (defined by a
* higher-level client) should
* be used and shall not be
* treated as actual index
* into CPAL ColorRecord array. */
public:
DEFINE_SIZE_STATIC (4);
};
struct BaseGlyphRecord
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
inline int cmp (hb_codepoint_t g) const {
return g < glyphId ? -1 : g > glyphId ? 1 : 0;
}
static int cmp (const void *pa, const void *pb)
{
const hb_codepoint_t *a = (const hb_codepoint_t *) pa;
const BaseGlyphRecord *b = (const BaseGlyphRecord *) pb;
return b->cmp (*a);
}
public:
GlyphID glyphId; /* Glyph ID of reference glyph */
HBUINT16 firstLayerIdx; /* Index (from beginning of
* the Layer Records) to the
* layer record. There will be
* numLayers consecutive entries
* for this base glyph. */
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 get_base_glyph_record (hb_codepoint_t glyph_id,
unsigned int *first_layer /* OUT */,
unsigned int *num_layers /* OUT */) const
{
const BaseGlyphRecord* record;
record = (BaseGlyphRecord *) bsearch (&glyph_id, &(this+baseGlyphsZ), numBaseGlyphs,
sizeof (BaseGlyphRecord), BaseGlyphRecord::cmp);
if (unlikely (!record))
return false;
if (first_layer) *first_layer = record->firstLayerIdx;
if (num_layers) *num_layers = record->numLayers;
return true;
}
inline bool get_layer_record (unsigned int record,
hb_codepoint_t *glyph_id /* OUT */,
unsigned int *color_index /* OUT */) const
{
if (unlikely (record >= numLayers))
{
*glyph_id = 0;
*color_index = 0xFFFF;
return false;
}
const LayerRecord &layer = (this+layersZ)[record];
if (glyph_id) *glyph_id = layer.glyphId;
if (color_index) *color_index = layer.colorIdx;
return true;
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
(this+baseGlyphsZ).sanitize (c, numBaseGlyphs) &&
(this+layersZ).sanitize (c, numLayers)));
}
protected:
HBUINT16 version; /* Table version number (starts at 0). */
HBUINT16 numBaseGlyphs; /* Number of Base Glyph Records. */
LOffsetTo<UnsizedArrayOf<BaseGlyphRecord>, false>
baseGlyphsZ; /* Offset to Base Glyph records. */
LOffsetTo<UnsizedArrayOf<LayerRecord>, false>
layersZ; /* Offset to Layer Records. */
HBUINT16 numLayers; /* Number of Layer Records. */
public:
DEFINE_SIZE_STATIC (14);
};
} /* namespace OT */
#endif /* HB_OT_COLOR_COLR_TABLE_HH */
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