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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SFNTLY_CPP_SRC_SFNTLY_TABLE_CORE_HORIZONTAL_METRICS_TABLE_H_
#define SFNTLY_CPP_SRC_SFNTLY_TABLE_CORE_HORIZONTAL_METRICS_TABLE_H_
#include "sfntly/table/table.h"
#include "sfntly/table/table_based_table_builder.h"
namespace sfntly {
// A Horizontal Metrics table - 'hmtx'.
class HorizontalMetricsTable : public Table,
public RefCounted<HorizontalMetricsTable> {
public:
// Builder for a Horizontal Metrics Table - 'hmtx'.
class Builder : public TableBasedTableBuilder, public RefCounted<Builder> {
public:
// Constructor scope altered to public because C++ does not allow base
// class to instantiate derived class with protected constructors.
Builder(Header* header, WritableFontData* data);
Builder(Header* header, ReadableFontData* data);
virtual ~Builder();
virtual CALLER_ATTACH FontDataTable* SubBuildTable(ReadableFontData* data);
static CALLER_ATTACH Builder* CreateBuilder(Header* header,
WritableFontData* data);
void SetNumberOfHMetrics(int32_t num_hmetrics);
void SetNumGlyphs(int32_t num_glyphs);
private:
int32_t num_hmetrics_;
int32_t num_glyphs_;
};
virtual ~HorizontalMetricsTable();
int32_t NumberOfHMetrics();
int32_t NumberOfLSBs();
int32_t HMetricAdvanceWidth(int32_t entry);
int32_t HMetricLSB(int32_t entry);
int32_t LsbTableEntry(int32_t entry);
int32_t AdvanceWidth(int32_t glyph_id);
int32_t LeftSideBearing(int32_t glyph_id);
private:
struct Offset {
enum {
// hMetrics
kHMetricsStart = 0,
kHMetricsSize = 4,
// Offset within an hMetric
kHMetricsAdvanceWidth = 0,
kHMetricsLeftSideBearing = 2,
kLeftSideBearingSize = 2
};
};
HorizontalMetricsTable(Header* header,
ReadableFontData* data,
int32_t num_hmetrics,
int32_t num_glyphs);
int32_t num_hmetrics_;
int32_t num_glyphs_;
};
typedef Ptr<HorizontalMetricsTable> HorizontalMetricsTablePtr;
typedef Ptr<HorizontalMetricsTable::Builder> HorizontalMetricsTableBuilderPtr;
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_TABLE_CORE_HORIZONTAL_METRICS_TABLE_H_
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