harfbuzz/src/hb-ot-color-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_COLOR_COLR_TABLE_HH
#define HB_OT_COLOR_COLR_TABLE_HH
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#include "hb-open-type.hh"
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/*
* COLR -- Color
* https://docs.microsoft.com/en-us/typography/opentype/spec/colr
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*/
#define HB_OT_TAG_COLR HB_TAG('C','O','L','R')
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namespace OT {
struct LayerRecord
{
bool sanitize (hb_sanitize_context_t *c) const
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{
TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
public:
GlyphID glyphId; /* Glyph ID of layer glyph */
Index 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. */
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public:
DEFINE_SIZE_STATIC (4);
};
struct BaseGlyphRecord
{
int cmp (hb_codepoint_t g) const
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{ return g < glyphId ? -1 : g > glyphId ? 1 : 0; }
bool sanitize (hb_sanitize_context_t *c) const
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{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
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 */
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public:
DEFINE_SIZE_STATIC (6);
};
struct COLR
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_COLR;
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bool has_data () const { return numBaseGlyphs; }
unsigned int get_glyph_layers (hb_codepoint_t glyph,
unsigned int start_offset,
unsigned int *count, /* IN/OUT. May be NULL. */
hb_ot_color_layer_t *layers /* OUT. May be NULL. */) const
{
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const BaseGlyphRecord &record = (this+baseGlyphsZ).bsearch (numBaseGlyphs, glyph);
hb_array_t<const LayerRecord> all_layers ((this+layersZ).arrayZ, numLayers);
hb_array_t<const LayerRecord> glyph_layers = all_layers.sub_array (record.firstLayerIdx,
record.numLayers);
if (count)
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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.length;
for (unsigned int i = 0; i < segment_layers.length; i++)
{
layers[i].glyph = segment_layers.arrayZ[i].glyphId;
layers[i].color_index = segment_layers.arrayZ[i].colorIdx;
}
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}
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return glyph_layers.length;
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}
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)));
}
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protected:
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HBUINT16 version; /* Table version number (starts at 0). */
HBUINT16 numBaseGlyphs; /* Number of Base Glyph Records. */
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LNNOffsetTo<SortedUnsizedArrayOf<BaseGlyphRecord> >
baseGlyphsZ; /* Offset to Base Glyph records. */
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LNNOffsetTo<UnsizedArrayOf<LayerRecord> >
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layersZ; /* Offset to Layer Records. */
HBUINT16 numLayers; /* Number of Layer Records. */
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public:
DEFINE_SIZE_STATIC (14);
};
} /* namespace OT */
#endif /* HB_OT_COLOR_COLR_TABLE_HH */