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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 OT_COLOR_SVG_SVG_HH
#define OT_COLOR_SVG_SVG_HH
#include "../../../hb-open-type.hh"
#include "../../../hb-blob.hh"
#include "../../../hb-paint.hh"
/*
* SVG -- SVG (Scalable Vector Graphics)
* https://docs.microsoft.com/en-us/typography/opentype/spec/svg
*/
#define HB_OT_TAG_SVG HB_TAG('S','V','G',' ')
namespace OT {
struct SVGDocumentIndexEntry
{
int cmp (hb_codepoint_t g) const
{ return g < startGlyphID ? -1 : g > endGlyphID ? 1 : 0; }
hb_blob_t *reference_blob (hb_blob_t *svg_blob, unsigned int index_offset) const
{
return hb_blob_create_sub_blob (svg_blob,
index_offset + (unsigned int) svgDoc,
svgDocLength);
}
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
hb_barrier () &&
svgDoc.sanitize (c, base, svgDocLength));
}
protected:
HBUINT16 startGlyphID; /* The first glyph ID in the range described by
* this index entry. */
HBUINT16 endGlyphID; /* The last glyph ID in the range described by
* this index entry. Must be >= startGlyphID. */
NNOffset32To<UnsizedArrayOf<HBUINT8>>
svgDoc; /* Offset from the beginning of the SVG Document Index
* to an SVG document. Must be non-zero. */
HBUINT32 svgDocLength; /* Length of the SVG document.
* Must be non-zero. */
public:
DEFINE_SIZE_STATIC (12);
};
struct SVG
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_SVG;
bool has_data () const { return svgDocEntries; }
struct accelerator_t
{
accelerator_t (hb_face_t *face)
{ table = hb_sanitize_context_t ().reference_table<SVG> (face); }
~accelerator_t () { table.destroy (); }
hb_blob_t *reference_blob_for_glyph (hb_codepoint_t glyph_id) const
{
return table->get_glyph_entry (glyph_id).reference_blob (table.get_blob (),
table->svgDocEntries);
}
bool has_data () const { return table->has_data (); }
bool paint_glyph (hb_font_t *font HB_UNUSED, hb_codepoint_t glyph, hb_paint_funcs_t *funcs, void *data) const
{
if (!has_data ())
return false;
hb_blob_t *blob = reference_blob_for_glyph (glyph);
if (blob == hb_blob_get_empty ())
return false;
funcs->image (data,
blob,
0, 0,
HB_PAINT_IMAGE_FORMAT_SVG,
font->slant_xy,
nullptr);
hb_blob_destroy (blob);
return true;
}
private:
hb_blob_ptr_t<SVG> table;
public:
DEFINE_SIZE_STATIC (sizeof (hb_blob_ptr_t<SVG>));
};
const SVGDocumentIndexEntry &get_glyph_entry (hb_codepoint_t glyph_id) const
{ return (this+svgDocEntries).bsearch (glyph_id); }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
(this+svgDocEntries).sanitize_shallow (c)));
}
protected:
HBUINT16 version; /* Table version (starting at 0). */
Offset32To<SortedArray16Of<SVGDocumentIndexEntry>>
svgDocEntries; /* Offset (relative to the start of the SVG table) to the
* SVG Documents Index. Must be non-zero. */
/* Array of SVG Document Index Entries. */
HBUINT32 reserved; /* Set to 0. */
public:
DEFINE_SIZE_STATIC (10);
};
struct SVG_accelerator_t : SVG::accelerator_t {
SVG_accelerator_t (hb_face_t *face) : SVG::accelerator_t (face) {}
};
} /* namespace OT */
#endif /* OT_COLOR_SVG_SVG_HH */
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