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1 /*
2  * Copyright © 2018 Adobe Inc.
3  *
4  *  This is part of HarfBuzz, a text shaping library.
5  *
6  * Permission is hereby granted, without written agreement and without
7  * license or royalty fees, to use, copy, modify, and distribute this
8  * software and its documentation for any purpose, provided that the
9  * above copyright notice and the following two paragraphs appear in
10  * all copies of this software.
11  *
12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16  * DAMAGE.
17  *
18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23  *
24  * Adobe Author(s): Michiharu Ariza
25  */
26 
27 #ifndef HB_OT_VORG_TABLE_HH
28 #define HB_OT_VORG_TABLE_HH
29 
30 #include "hb-open-type.hh"
31 
32 /*
33  * VORG -- Vertical Origin Table
34  * https://docs.microsoft.com/en-us/typography/opentype/spec/vorg
35  */
36 #define HB_OT_TAG_VORG HB_TAG('V','O','R','G')
37 
38 namespace OT {
39 
40 struct VertOriginMetric
41 {
cmpOT::VertOriginMetric42   int cmp (hb_codepoint_t g) const { return glyph.cmp (g); }
43 
sanitizeOT::VertOriginMetric44   bool sanitize (hb_sanitize_context_t *c) const
45   {
46     TRACE_SANITIZE (this);
47     return_trace (c->check_struct (this));
48   }
49 
50   public:
51   GlyphID	glyph;
52   FWORD		vertOriginY;
53 
54   public:
55   DEFINE_SIZE_STATIC (4);
56 };
57 
58 struct VORG
59 {
60   enum { tableTag = HB_OT_TAG_VORG };
61 
has_dataOT::VORG62   bool has_data () const { return version.to_int (); }
63 
get_y_originOT::VORG64   int get_y_origin (hb_codepoint_t glyph) const
65   {
66     unsigned int i;
67     if (!vertYOrigins.bfind (glyph, &i))
68       return defaultVertOriginY;
69     return vertYOrigins[i].vertOriginY;
70   }
71 
_subsetOT::VORG72   bool _subset (const hb_subset_plan_t *plan HB_UNUSED,
73 		const VORG *vorg_table,
74 		const hb_vector_t<VertOriginMetric> &subset_metrics,
75 		unsigned int dest_sz,
76 		void *dest) const
77   {
78     hb_serialize_context_t c (dest, dest_sz);
79 
80     VORG *subset_table = c.start_serialize<VORG> ();
81     if (unlikely (!c.extend_min (*subset_table)))
82       return false;
83 
84     subset_table->version.major.set (1);
85     subset_table->version.minor.set (0);
86 
87     subset_table->defaultVertOriginY.set (vorg_table->defaultVertOriginY);
88     subset_table->vertYOrigins.len.set (subset_metrics.len);
89 
90     bool success = true;
91     if (subset_metrics.len > 0)
92     {
93       unsigned int  size = VertOriginMetric::static_size * subset_metrics.len;
94       VertOriginMetric  *metrics = c.allocate_size<VertOriginMetric> (size);
95       if (likely (metrics != nullptr))
96         memcpy (metrics, &subset_metrics[0], size);
97       else
98         success = false;
99     }
100     c.end_serialize ();
101 
102     return success;
103   }
104 
subsetOT::VORG105   bool subset (hb_subset_plan_t *plan) const
106   {
107     hb_blob_t *vorg_blob = hb_sanitize_context_t().reference_table<VORG> (plan->source);
108     const VORG *vorg_table = vorg_blob->as<VORG> ();
109 
110     /* count the number of glyphs to be included in the subset table */
111     hb_vector_t<VertOriginMetric> subset_metrics;
112     subset_metrics.init ();
113     unsigned int glyph = 0;
114     unsigned int i = 0;
115     while ((glyph < plan->glyphs.len) && (i < vertYOrigins.len))
116     {
117       if (plan->glyphs[glyph] > vertYOrigins[i].glyph)
118         i++;
119       else if (plan->glyphs[glyph] < vertYOrigins[i].glyph)
120         glyph++;
121       else
122       {
123         VertOriginMetric *metrics = subset_metrics.push ();
124         metrics->glyph.set (glyph);
125         metrics->vertOriginY.set (vertYOrigins[i].vertOriginY);
126         glyph++;
127         i++;
128       }
129     }
130 
131     /* alloc the new table */
132     unsigned int dest_sz = VORG::min_size + VertOriginMetric::static_size * subset_metrics.len;
133     void *dest = (void *) malloc (dest_sz);
134     if (unlikely (!dest))
135     {
136       subset_metrics.fini ();
137       hb_blob_destroy (vorg_blob);
138       return false;
139     }
140 
141     /* serialize the new table */
142     if (!_subset (plan, vorg_table, subset_metrics, dest_sz, dest))
143     {
144       subset_metrics.fini ();
145       free (dest);
146       hb_blob_destroy (vorg_blob);
147       return false;
148     }
149 
150     hb_blob_t *result = hb_blob_create ((const char *)dest,
151                                         dest_sz,
152                                         HB_MEMORY_MODE_READONLY,
153                                         dest,
154                                         free);
155     bool success = plan->add_table (HB_OT_TAG_VORG, result);
156     hb_blob_destroy (result);
157     subset_metrics.fini ();
158     hb_blob_destroy (vorg_blob);
159     return success;
160   }
161 
sanitizeOT::VORG162   bool sanitize (hb_sanitize_context_t *c) const
163   {
164     TRACE_SANITIZE (this);
165     return_trace (c->check_struct (this) &&
166                   version.major == 1 &&
167                   vertYOrigins.sanitize (c));
168   }
169 
170   protected:
171   FixedVersion<>	version;		/* Version of VORG table. Set to 0x00010000u. */
172   FWORD			defaultVertOriginY;	/* The default vertical origin. */
173   SortedArrayOf<VertOriginMetric>
174 			vertYOrigins;		/* The array of vertical origins. */
175 
176   public:
177   DEFINE_SIZE_ARRAY(8, vertYOrigins);
178 };
179 } /* namespace OT */
180 
181 #endif /* HB_OT_VORG_TABLE_HH */
182