Add 'head' table

cf5585cf · Behdad Esfahbod · e29caf3f · cf5585cf · cf5585cf · cf5585cf
5 changed file
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -20,6 +20,7 @@ HBSOURCES =  \
 	hb-open-file-private.hh \
 	hb-open-type-private.hh \
 	hb-language.c \
+	hb-ot-head-private.hh \
 	hb-private.h \
 	hb-shape.cc \
 	hb-unicode.c \

--- a/src/hb-font-private.hh
+++ b/src/hb-font-private.hh
@@ -31,6 +31,8 @@

 #include "hb-font.h"

+#include "hb-ot-head-private.hh"
+
 #include "hb-ot-layout-private.hh"

 HB_BEGIN_DECLS
@@ -64,6 +66,9 @@ struct _hb_face_t {
  hb_destroy_func_t    destroy;
  void                *user_data;

+  hb_blob_t *head_blob;
+  const struct head *head_table;
+
  hb_ot_layout_t ot_layout;
 };


--- a/src/hb-font.cc
+++ b/src/hb-font.cc
@@ -231,6 +231,9 @@ static hb_face_t _hb_face_nil = {
  NULL, /* destroy */
  NULL, /* user_data */

+  NULL, /* head_blob */
+  NULL, /* head_table */
+
  {} /* ot_layout */
 };

@@ -324,6 +327,9 @@ hb_face_create_for_data (hb_blob_t    *blob,
  face->user_data = _hb_face_for_data_closure_create (Sanitizer<OpenTypeFontFile>::sanitize (blob), index);
  hb_blob_destroy (blob);

+  face->head_blob = Sanitizer<head>::sanitize (hb_face_get_table (face, HB_OT_TAG_head));
+  face->head_table = Sanitizer<head>::lock_instance (face->head_blob);
+
  _hb_ot_layout_init (face);

  return face;
@@ -349,6 +355,9 @@ hb_face_destroy (hb_face_t *face)

  _hb_ot_layout_fini (face);

+  hb_blob_unlock (face->head_blob);
+  hb_blob_destroy (face->head_blob);
+
  if (face->destroy)
    face->destroy (face->user_data);


--- a/src/hb-open-type-private.hh
+++ b/src/hb-open-type-private.hh
@@ -120,7 +120,7 @@ inline Type& StructAfter(TObject &X)
 */

 /* Global nul-content Null pool.  Enlarge as necessary. */
-static const void *_NullPool[16 / sizeof (void *)];
+static const void *_NullPool[64 / sizeof (void *)];

 /* Generic nul-content Null objects. */
 template <typename Type>

--- a/src/hb-ot-head-private.hh
+++ b/src/hb-ot-head-private.hh
+/*
+ * Copyright (C) 2010  Red Hat, Inc.
+ *
+ *  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.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_HEAD_PRIVATE_HH
+#define HB_OT_HEAD_PRIVATE_HH
+
+#include "hb-open-type-private.hh"
+
+/*
+ * head
+ */
+
+#define HB_OT_TAG_head HB_TAG('h','e','a','d')
+
+struct head
+{
+  static const hb_tag_t Tag	= HB_OT_TAG_head;
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    /* Shall we check for magicNumber here?  Who cares? */
+    return c->check_struct (this) && likely (version.major == 1);
+  }
+
+  FixedVersion	version;		/* Version of the head table--currently
+					 * 0x00010000 for version 1.0. */
+  FixedVersion	fontRevision;		/* Set by font manufacturer. */
+  ULONG		checkSumAdjustment;	/* To compute: set it to 0, sum the
+					 * entire font as ULONG, then store
+					 * 0xB1B0AFBA - sum. */
+  ULONG		magicNumber;		/* Set to 0x5F0F3CF5. */
+  USHORT	flags;			/* Bit 0: Baseline for font at y=0;
+					 * Bit 1: Left sidebearing point at x=0;
+					 * Bit 2: Instructions may depend on point size;
+					 * Bit 3: Force ppem to integer values for all
+					 *   internal scaler math; may use fractional
+					 *   ppem sizes if this bit is clear;
+					 * Bit 4: Instructions may alter advance width
+					 *   (the advance widths might not scale linearly);
+
+					 * Bits 5-10: These should be set according to
+					 *   Apple's specification. However, they are not
+					 *   implemented in OpenType.
+					 * Bit 5: This bit should be set in fonts that are
+					 *   intended to e laid out vertically, and in
+					 *   which the glyphs have been drawn such that an
+					 *   x-coordinate of 0 corresponds to the desired
+					 *   vertical baseline.
+					 * Bit 6: This bit must be set to zero.
+					 * Bit 7: This bit should be set if the font
+					 *   requires layout for correct linguistic
+					 *   rendering (e.g. Arabic fonts).
+					 * Bit 8: This bit should be set for a GX font
+					 *   which has one or more metamorphosis effects
+					 *   designated as happening by default.
+					 * Bit 9: This bit should be set if the font
+					 *   contains any strong right-to-left glyphs.
+					 * Bit 10: This bit should be set if the font
+					 *   contains Indic-style rearrangement effects.
+
+					 * Bit 11: Font data is 'lossless,' as a result
+					 *   of having been compressed and decompressed
+					 *   with the Agfa MicroType Express engine.
+					 * Bit 12: Font converted (produce compatible metrics)
+					 * Bit 13: Font optimized for ClearType™.
+					 *   Note, fonts that rely on embedded bitmaps (EBDT)
+					 *   for rendering should not be considered optimized
+					 *   for ClearType, and therefore should keep this bit
+					 *   cleared.
+					 * Bit 14: Reserved, set to 0
+					 * Bit 15: Reserved, set to 0. */
+  USHORT	unitsPerEm;		/* Valid range is from 16 to 16384. This value
+					 * should be a power of 2 for fonts that have
+					 * TrueType outlines. */
+  LONGDATETIME	created;		/* Number of seconds since 12:00 midnight,
+					   January 1, 1904. 64-bit integer */
+  LONGDATETIME	modified;		/* Number of seconds since 12:00 midnight,
+					   January 1, 1904. 64-bit integer */
+  SHORT		xMin;			/* For all glyph bounding boxes. */
+  SHORT		yMin;			/* For all glyph bounding boxes. */
+  SHORT		xMax;			/* For all glyph bounding boxes. */
+  SHORT		yMax;			/* For all glyph bounding boxes. */
+  USHORT	macStyle;		/* Bit 0: Bold (if set to 1);
+					 * Bit 1: Italic (if set to 1)
+					 * Bit 2: Underline (if set to 1)
+					 * Bit 3: Outline (if set to 1)
+					 * Bit 4: Shadow (if set to 1)
+					 * Bit 5: Condensed (if set to 1)
+					 * Bit 6: Extended (if set to 1)
+					 * Bits 7-15: Reserved (set to 0). */
+  USHORT	lowestRecPPEM;		/* Smallest readable size in pixels. */
+  SHORT		fontDirectionHint;	/* Deprecated (Set to 2).
+					 * 0: Fully mixed directional glyphs;
+					 * 1: Only strongly left to right;
+					 * 2: Like 1 but also contains neutrals;
+					 * -1: Only strongly right to left;
+					 * -2: Like -1 but also contains neutrals. */
+  SHORT		indexToLocFormat;	/* 0 for short offsets, 1 for long. */
+  SHORT		glyphDataFormat;	/* 0 for current format. */
+  public:
+  DEFINE_SIZE_STATIC (54);
+};
+
+
+#endif /* HB_OT_HEAD_PRIVATE_HH */