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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.
*/
#include "sfntly/table/core/horizontal_metrics_table.h"
#include "sfntly/port/exception_type.h"
namespace sfntly {
/******************************************************************************
* HorizontalMetricsTable class
******************************************************************************/
HorizontalMetricsTable::~HorizontalMetricsTable() {}
int32_t HorizontalMetricsTable::NumberOfHMetrics() {
return num_hmetrics_;
}
int32_t HorizontalMetricsTable::NumberOfLSBs() {
return num_glyphs_ - num_hmetrics_;
}
int32_t HorizontalMetricsTable::HMetricAdvanceWidth(int32_t entry) {
if (entry > num_hmetrics_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IndexOutOfBoundException();
#endif
return 0;
}
int32_t offset = Offset::kHMetricsStart + (entry * Offset::kHMetricsSize) +
Offset::kHMetricsAdvanceWidth;
return data_->ReadUShort(offset);
}
int32_t HorizontalMetricsTable::HMetricLSB(int32_t entry) {
if (entry > num_hmetrics_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IndexOutOfBoundException();
#endif
return 0;
}
int32_t offset = Offset::kHMetricsStart + (entry * Offset::kHMetricsSize) +
Offset::kHMetricsLeftSideBearing;
return data_->ReadShort(offset);
}
int32_t HorizontalMetricsTable::LsbTableEntry(int32_t entry) {
if (entry > num_hmetrics_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IndexOutOfBoundException();
#endif
return 0;
}
int32_t offset = Offset::kHMetricsStart + (entry * Offset::kHMetricsSize) +
Offset::kLeftSideBearingSize;
return data_->ReadShort(offset);
}
int32_t HorizontalMetricsTable::AdvanceWidth(int32_t glyph_id) {
if (glyph_id < num_hmetrics_) {
return HMetricAdvanceWidth(glyph_id);
}
return HMetricAdvanceWidth(glyph_id - num_hmetrics_);
}
int32_t HorizontalMetricsTable::LeftSideBearing(int32_t glyph_id) {
if (glyph_id < num_hmetrics_) {
return HMetricLSB(glyph_id);
}
return LsbTableEntry(glyph_id - num_hmetrics_);
}
HorizontalMetricsTable::HorizontalMetricsTable(Header* header,
ReadableFontData* data,
int32_t num_hmetrics,
int32_t num_glyphs)
: Table(header, data),
num_hmetrics_(num_hmetrics),
num_glyphs_(num_glyphs) {
}
/******************************************************************************
* HorizontalMetricsTable::Builder class
******************************************************************************/
HorizontalMetricsTable::Builder::Builder(Header* header, WritableFontData* data)
: Table::TableBasedTableBuilder(header, data),
num_hmetrics_(-1),
num_glyphs_(-1) {
}
HorizontalMetricsTable::Builder::Builder(Header* header, ReadableFontData* data)
: Table::TableBasedTableBuilder(header, data),
num_hmetrics_(-1),
num_glyphs_(-1) {
}
HorizontalMetricsTable::Builder::~Builder() {}
CALLER_ATTACH FontDataTable*
HorizontalMetricsTable::Builder::SubBuildTable(ReadableFontData* data) {
FontDataTablePtr table =
new HorizontalMetricsTable(header(), data, num_hmetrics_, num_glyphs_);
return table.Detach();
}
CALLER_ATTACH HorizontalMetricsTable::Builder*
HorizontalMetricsTable::Builder::CreateBuilder(Header* header,
WritableFontData* data) {
Ptr<HorizontalMetricsTable::Builder> builder;
builder = new HorizontalMetricsTable::Builder(header, data);
return builder.Detach();
}
void HorizontalMetricsTable::Builder::SetNumberOfHMetrics(
int32_t num_hmetrics) {
assert(num_hmetrics >= 0);
num_hmetrics_ = num_hmetrics;
HorizontalMetricsTable* table =
down_cast<HorizontalMetricsTable*>(this->GetTable());
table->num_hmetrics_ = num_hmetrics;
}
void HorizontalMetricsTable::Builder::SetNumGlyphs(int32_t num_glyphs) {
assert(num_glyphs >= 0);
num_glyphs_ = num_glyphs;
HorizontalMetricsTable* table =
down_cast<HorizontalMetricsTable*>(this->GetTable());
table->num_glyphs_ = num_glyphs;
}
} // namespace sfntly