[ot-color] sbix table implementation (#870)

src/Makefile.sources

@@ -18,6 +18,7 @@ HB_BASE_sources = \
 	hb-open-file-private.hh \
 	hb-open-type-private.hh \
 	hb-ot-color-cbdt-table.hh \
+	hb-ot-color-sbix-table.hh \
 	hb-ot-cmap-table.hh \
 	hb-ot-glyf-table.hh \
 	hb-ot-hdmx-table.hh \

src/hb-ot-color-sbix-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_SBIX_TABLE_HH
+#define HB_OT_COLOR_SBIX_TABLE_HH
+
+#include "hb-open-type-private.hh"
+
+#define HB_OT_TAG_SBIX HB_TAG('s','b','i','x')
+
+namespace OT {
+
+
+struct SBIXGlyph
+{
+  friend struct sbix;
+
+  protected:
+  HBINT16 originOffsetX;
+  HBINT16 originOffsetY;
+  unsigned char tag[4];
+  HBUINT8 data[VAR];
+  public:
+  DEFINE_SIZE_STATIC (9);
+};
+
+struct ImageTable
+{
+  friend struct sbix;
+
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) &&
+      c->check_array (imageOffsetsZ, sizeof (HBUINT32), c->num_glyphs) &&
+      c->check_range (this, imageOffsetsZ[c->num_glyphs]));
+  }
+
+  protected:
+  HBUINT16	ppem;
+  HBUINT16	resolution;
+  LOffsetTo<SBIXGlyph>	imageOffsetsZ[VAR]; // VAR=maxp.numGlyphs + 1
+  public:
+  DEFINE_SIZE_STATIC (8);
+};
+
+/*
+ * sbix -- Standard Bitmap Graphics Table
+ */
+// It should be called with something like this so it can have
+// access to num_glyph while sanitizing.
+//
+//   static inline const OT::sbix*
+//   _get_sbix (hb_face_t *face)
+//   {
+//     OT::Sanitizer<OT::sbix> sanitizer;
+//     sanitizer.set_num_glyphs (face->get_num_glyphs ());
+//     hb_blob_t *sbix_blob = sanitizer.sanitize (face->reference_table (HB_OT_TAG_SBIX));
+//     return OT::Sanitizer<OT::sbix>::lock_instance (sbix_blob);
+//   }
+//
+struct sbix
+{
+  static const hb_tag_t tableTag = HB_OT_TAG_SBIX;
+
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    if (!(c->check_struct (this) && imageTables.sanitize (c, this)))
+      return_trace (false);
+
+    for (unsigned int i = 0; i < imageTables.len; ++i)
+      if (!(imageTables[i].sanitize (c, this)))
+        return_trace (false);
+
+    // dump (c->num_glyphs, 8);
+
+    return_trace (true);
+  }
+
+  // inline void dump (unsigned int num_glyphs, unsigned int group) const
+  // {
+  //   const ImageTable &imageTable = imageTables[group](this);
+  //   for (unsigned int i = 0; i < num_glyphs; ++i)
+  //     if (imageTable.imageOffsetsZ[i + 1] - imageTable.imageOffsetsZ[i] > 0)
+  //     {
+  //       const SBIXGlyph &sbixGlyph = imageTable.imageOffsetsZ[i]((const void *) &imageTable);
+  //       char outName[255];
+  //       sprintf (outName, "out/%d-%d.png", group, i);
+  //       FILE *f = fopen (outName, "wb");
+  //       fwrite (sbixGlyph.data, 1,
+  //         imageTable.imageOffsetsZ[i + 1] - imageTable.imageOffsetsZ[i] - 8, f);
+  //       fclose (f);
+  //     }
+  // }
+
+  protected:
+  HBUINT16 version;
+  HBUINT16 flags;
+  ArrayOf<LOffsetTo<ImageTable>, HBUINT32> imageTables;
+  public:
+  DEFINE_SIZE_ARRAY (8, imageTables);
+};
+
+} /* namespace OT */
+
+#endif /* HB_OT_COLOR_SBIX_TABLE_HH */

src/hb-ot-layout.cc

@@ -39,6 +39,7 @@
 #include "hb-ot-name-table.hh" // Just so we compile it; unused otherwise.
 #include "hb-ot-color-colr-table.hh"
 #include "hb-ot-color-cpal-table.hh"
+#include "hb-ot-color-sbix-table.hh" // Just so we compile it; unused otherwise.
 
 #include "hb-ot-map-private.hh"