1/*
2 * Copyright 2011 Google Inc. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "sfntly/table/core/horizontal_metrics_table.h"
18#include "sfntly/port/exception_type.h"
19
20namespace sfntly {
21/******************************************************************************
22 * HorizontalMetricsTable class
23 ******************************************************************************/
24HorizontalMetricsTable::~HorizontalMetricsTable() {}
25
26int32_t HorizontalMetricsTable::NumberOfHMetrics() {
27  return num_hmetrics_;
28}
29
30int32_t HorizontalMetricsTable::NumberOfLSBs() {
31  return num_glyphs_ - num_hmetrics_;
32}
33
34int32_t HorizontalMetricsTable::HMetricAdvanceWidth(int32_t entry) {
35  if (entry > num_hmetrics_) {
36#if !defined (SFNTLY_NO_EXCEPTION)
37    throw IndexOutOfBoundException();
38#endif
39    return 0;
40  }
41  int32_t offset = Offset::kHMetricsStart + (entry * Offset::kHMetricsSize) +
42                   Offset::kHMetricsAdvanceWidth;
43  return data_->ReadUShort(offset);
44}
45
46int32_t HorizontalMetricsTable::HMetricLSB(int32_t entry) {
47  if (entry > num_hmetrics_) {
48#if !defined (SFNTLY_NO_EXCEPTION)
49    throw IndexOutOfBoundException();
50#endif
51    return 0;
52  }
53  int32_t offset = Offset::kHMetricsStart + (entry * Offset::kHMetricsSize) +
54                   Offset::kHMetricsLeftSideBearing;
55  return data_->ReadShort(offset);
56}
57
58int32_t HorizontalMetricsTable::LsbTableEntry(int32_t entry) {
59  if (entry > num_hmetrics_) {
60#if !defined (SFNTLY_NO_EXCEPTION)
61    throw IndexOutOfBoundException();
62#endif
63    return 0;
64  }
65  int32_t offset = Offset::kHMetricsStart + (entry * Offset::kHMetricsSize) +
66                   Offset::kLeftSideBearingSize;
67  return data_->ReadShort(offset);
68}
69
70int32_t HorizontalMetricsTable::AdvanceWidth(int32_t glyph_id) {
71  if (glyph_id < num_hmetrics_) {
72    return HMetricAdvanceWidth(glyph_id);
73  }
74  return HMetricAdvanceWidth(glyph_id - num_hmetrics_);
75}
76
77int32_t HorizontalMetricsTable::LeftSideBearing(int32_t glyph_id) {
78  if (glyph_id < num_hmetrics_) {
79    return HMetricLSB(glyph_id);
80  }
81  return LsbTableEntry(glyph_id - num_hmetrics_);
82}
83
84HorizontalMetricsTable::HorizontalMetricsTable(Header* header,
85                                               ReadableFontData* data,
86                                               int32_t num_hmetrics,
87                                               int32_t num_glyphs)
88    : Table(header, data),
89      num_hmetrics_(num_hmetrics),
90      num_glyphs_(num_glyphs) {
91}
92
93/******************************************************************************
94 * HorizontalMetricsTable::Builder class
95 ******************************************************************************/
96HorizontalMetricsTable::Builder::Builder(Header* header, WritableFontData* data)
97    : TableBasedTableBuilder(header, data), num_hmetrics_(-1), num_glyphs_(-1) {
98}
99
100HorizontalMetricsTable::Builder::Builder(Header* header, ReadableFontData* data)
101    : TableBasedTableBuilder(header, data), num_hmetrics_(-1), num_glyphs_(-1) {
102}
103
104HorizontalMetricsTable::Builder::~Builder() {}
105
106CALLER_ATTACH FontDataTable*
107    HorizontalMetricsTable::Builder::SubBuildTable(ReadableFontData* data) {
108  FontDataTablePtr table =
109      new HorizontalMetricsTable(header(), data, num_hmetrics_, num_glyphs_);
110  return table.Detach();
111}
112
113CALLER_ATTACH HorizontalMetricsTable::Builder*
114    HorizontalMetricsTable::Builder::CreateBuilder(Header* header,
115                                                   WritableFontData* data) {
116  Ptr<HorizontalMetricsTable::Builder> builder;
117  builder = new HorizontalMetricsTable::Builder(header, data);
118  return builder.Detach();
119}
120
121void HorizontalMetricsTable::Builder::SetNumberOfHMetrics(
122    int32_t num_hmetrics) {
123  assert(num_hmetrics >= 0);
124  num_hmetrics_ = num_hmetrics;
125  HorizontalMetricsTable* table =
126      down_cast<HorizontalMetricsTable*>(this->GetTable());
127  table->num_hmetrics_ = num_hmetrics;
128}
129
130void HorizontalMetricsTable::Builder::SetNumGlyphs(int32_t num_glyphs) {
131  assert(num_glyphs >= 0);
132  num_glyphs_ = num_glyphs;
133  HorizontalMetricsTable* table =
134      down_cast<HorizontalMetricsTable*>(this->GetTable());
135  table->num_glyphs_ = num_glyphs;
136}
137
138}  // namespace sfntly
139