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 #ifndef SFNTLY_CPP_SRC_SFNTLY_TABLE_CORE_HORIZONTAL_DEVICE_METRICS_TABLE_H_ 18 #define SFNTLY_CPP_SRC_SFNTLY_TABLE_CORE_HORIZONTAL_DEVICE_METRICS_TABLE_H_ 19 20 #include "sfntly/table/table.h" 21 #include "sfntly/table/table_based_table_builder.h" 22 23 namespace sfntly { 24 25 // A Horizontal Device Metrics table - 'hdmx' 26 class HorizontalDeviceMetricsTable 27 : public Table, 28 public RefCounted<HorizontalDeviceMetricsTable> { 29 public: 30 class Builder : public TableBasedTableBuilder, public RefCounted<Builder> { 31 public: 32 // Constructor scope altered to public because C++ does not allow base 33 // class to instantiate derived class with protected constructors. 34 Builder(Header* header, WritableFontData* data); 35 Builder(Header* header, ReadableFontData* data); 36 virtual ~Builder(); 37 virtual CALLER_ATTACH FontDataTable* SubBuildTable(ReadableFontData* data); 38 39 static CALLER_ATTACH Builder* CreateBuilder(Header* header, 40 WritableFontData* data); 41 42 void SetNumGlyphs(int32_t num_glyphs); 43 44 private: 45 int32_t num_glyphs_; 46 }; 47 48 virtual ~HorizontalDeviceMetricsTable(); 49 50 int32_t Version(); 51 int32_t NumRecords(); 52 int32_t RecordSize(); 53 int32_t PixelSize(int32_t record_index); 54 int32_t MaxWidth(int32_t record_index); 55 int32_t Width(int32_t record_index, int32_t glyph_num); 56 57 private: 58 struct Offset { 59 enum { 60 kVersion = 0, 61 kNumRecords = 2, 62 kSizeDeviceRecord = 4, 63 kRecords = 8, 64 65 // Offsets within a device record 66 kDeviceRecordPixelSize = 0, 67 kDeviceRecordMaxWidth = 1, 68 kDeviceRecordWidths = 2, 69 }; 70 }; 71 HorizontalDeviceMetricsTable(Header* header, 72 ReadableFontData* data, 73 int32_t num_glyphs); 74 75 int32_t num_glyphs_; 76 }; 77 typedef Ptr<HorizontalDeviceMetricsTable> HorizontalDeviceMetricsTablePtr; 78 typedef Ptr<HorizontalDeviceMetricsTable::Builder> 79 HorizontalDeviceMetricsTableBuilderPtr; 80 } // namespace sfntly 81 82 #endif // SFNTLY_CPP_SRC_SFNTLY_TABLE_CORE_HORIZONTAL_DEVICE_METRICS_TABLE_H_ 83