[aat] Implement bsln table parsing (#943)
diff --git a/src/Makefile.sources b/src/Makefile.sources
index ec5eb65..4917cf1 100644
--- a/src/Makefile.sources
+++ b/src/Makefile.sources
@@ -82,6 +82,7 @@
hb-aat-layout.cc \
hb-aat-layout-common-private.hh \
hb-aat-layout-ankr-table.hh \
+ hb-aat-layout-bsln-table.hh \
hb-aat-layout-kerx-table.hh \
hb-aat-layout-morx-table.hh \
hb-aat-layout-trak-table.hh \
diff --git a/src/hb-aat-layout-bsln-table.hh b/src/hb-aat-layout-bsln-table.hh
new file mode 100644
index 0000000..3b9e4fe
--- /dev/null
+++ b/src/hb-aat-layout-bsln-table.hh
@@ -0,0 +1,156 @@
+/*
+ * 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_AAT_LAYOUT_BSLN_TABLE_HH
+#define HB_AAT_LAYOUT_BSLN_TABLE_HH
+
+#include "hb-aat-layout-common-private.hh"
+
+#define HB_AAT_TAG_bsln HB_TAG('b','s','l','n')
+
+
+namespace AAT {
+
+struct BaselineTableFormat0Part
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ protected:
+ // Roman, Ideographic centered, Ideographic low, Hanging and Math
+ // are the default defined ones, but any other maybe accessed also.
+ HBINT16 deltas[32]; /* These are the FUnit distance deltas from
+ * the font's natural baseline to the other
+ * baselines used in the font. */
+ public:
+ DEFINE_SIZE_STATIC (64);
+};
+
+struct BaselineTableFormat1Part
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) && lookupTable.sanitize (c));
+ }
+
+ protected:
+ HBINT16 deltas[32]; /* ditto */
+ Lookup<HBUINT16>
+ lookupTable; /* Lookup table that maps glyphs to their
+ * baseline values. */
+ public:
+ DEFINE_SIZE_MIN (66);
+};
+
+struct BaselineTableFormat2Part
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ protected:
+ GlyphID stdGlyph; /* The specific glyph index number in this
+ * font that is used to set the baseline values.
+ * This is the standard glyph.
+ * This glyph must contain a set of control points
+ * (whose numbers are contained in the ctlPoints field)
+ * that are used to determine baseline distances. */
+ HBUINT16 ctlPoints[32]; /* Set of control point numbers,
+ * associated with the standard glyph.
+ * A value of 0xFFFF means there is no corresponding
+ * control point in the standard glyph. */
+ public:
+ DEFINE_SIZE_STATIC (66);
+};
+
+struct BaselineTableFormat3Part
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) && lookupTable.sanitize (c));
+ }
+
+ protected:
+ GlyphID stdGlyph; /* ditto */
+ HBUINT16 ctlPoints[32]; /* ditto */
+ Lookup<HBUINT16>
+ lookupTable; /* Lookup table that maps glyphs to their
+ * baseline values. */
+ public:
+ DEFINE_SIZE_MIN (68);
+};
+
+/*
+ * bsln -- Baseline table
+ * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bsln.html
+ */
+
+struct bsln
+{
+ static const hb_tag_t tableTag = HB_AAT_TAG_bsln;
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (!(c->check_struct (this) && defaultBaseline < 32))
+ return_trace (false);
+
+ switch (format) {
+ case 0: return_trace (parts.format0.sanitize (c));
+ case 1: return_trace (parts.format1.sanitize (c));
+ case 2: return_trace (parts.format2.sanitize (c));
+ case 3: return_trace (parts.format3.sanitize (c));
+ default:return_trace (true);
+ }
+ }
+
+ protected:
+ FixedVersion<>version; /* Version number of the Baseline table. */
+ HBUINT16 format; /* Format of the baseline table. Only one baseline
+ * format may be selected for the font. */
+ HBUINT16 defaultBaseline;/* Default baseline value for all glyphs.
+ * This value can be from 0 through 31. */
+ union {
+ // Distance-Based Formats
+ BaselineTableFormat0Part format0;
+ BaselineTableFormat1Part format1;
+ // Control Point-based Formats
+ BaselineTableFormat2Part format2;
+ BaselineTableFormat3Part format3;
+ } parts;
+ public:
+ DEFINE_SIZE_MIN (8);
+};
+
+} /* namespace AAT */
+
+
+#endif /* HB_AAT_LAYOUT_BSLN_TABLE_HH */
diff --git a/src/hb-aat-layout.cc b/src/hb-aat-layout.cc
index a9b4328..88625ac 100644
--- a/src/hb-aat-layout.cc
+++ b/src/hb-aat-layout.cc
@@ -31,10 +31,11 @@
#include "hb-aat-layout-private.hh"
#include "hb-aat-layout-ankr-table.hh"
+#include "hb-aat-layout-bsln-table.hh" // Just so we compile it; unused otherwise.
#include "hb-aat-layout-kerx-table.hh"
#include "hb-aat-layout-morx-table.hh"
#include "hb-aat-layout-trak-table.hh"
-#include "hb-aat-fmtx-table.hh" // Just so we compile it; unused otherwise
+#include "hb-aat-fmtx-table.hh" // Just so we compile it; unused otherwise.
#include "hb-aat-ltag-table.hh" // Just so we compile it; unused otherwise.
/*
