kc3-lang/harfbuzz/src/hb-ot-color-svg-table.hh

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• Hash : c5f90387
  Author :
  Date : 2022-12-22T12:16:55
  

  [paint] Add bitmap width/height to paint_image callback
  
  Such that we can add raw data as well.
  

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• src/hb-ot-color-svg-table.hh

• /*
   * 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_SVG_TABLE_HH
  #define HB_OT_COLOR_SVG_TABLE_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) &&
  		  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 /* HB_OT_COLOR_SVG_TABLE_HH */
  

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