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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/bitmap/index_sub_table.h"
#include "sfntly/table/bitmap/eblc_table.h"
#include "sfntly/table/bitmap/index_sub_table_format1.h"
#include "sfntly/table/bitmap/index_sub_table_format2.h"
#include "sfntly/table/bitmap/index_sub_table_format3.h"
#include "sfntly/table/bitmap/index_sub_table_format4.h"
#include "sfntly/table/bitmap/index_sub_table_format5.h"
namespace sfntly {
bool IndexSubTable::CheckGlyphRange(int32_t glyph_id) {
if (glyph_id < first_glyph_index() || glyph_id > last_glyph_index()) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IndexOutOfBoundException("Glyph ID is outside of the allowed range");
#endif
return false;
}
return true;
}
template <typename IndexSubTableType>
static IndexSubTableType* CreateTable(ReadableFontData* data,
int32_t index_sub_table_offset,
int32_t first_glyph_index,
int32_t last_glyph_index) {
ReadableFontDataPtr new_data;
new_data.Attach(down_cast<ReadableFontData*>(
data->Slice(index_sub_table_offset,
IndexSubTableType::GetDataLength(data,
index_sub_table_offset,
first_glyph_index,
last_glyph_index))));
return new IndexSubTableType(new_data, first_glyph_index, last_glyph_index);
}
// static
CALLER_ATTACH IndexSubTable*
IndexSubTable::CreateIndexSubTable(ReadableFontData* data,
int32_t offset_to_index_sub_table_array,
int32_t array_index) {
int32_t index_sub_table_entry_offset =
offset_to_index_sub_table_array +
array_index * EblcTable::Offset::kIndexSubTableEntryLength;
int32_t first_glyph_index =
data->ReadUShort(index_sub_table_entry_offset +
EblcTable::Offset::kIndexSubTableEntry_firstGlyphIndex);
int32_t last_glyph_index =
data->ReadUShort(index_sub_table_entry_offset +
EblcTable::Offset::kIndexSubTableEntry_lastGlyphIndex);
int32_t additional_offset_to_index_subtable = data->ReadULongAsInt(
index_sub_table_entry_offset +
EblcTable::Offset::kIndexSubTableEntry_additionalOffsetToIndexSubTable);
int32_t index_sub_table_offset = offset_to_index_sub_table_array +
additional_offset_to_index_subtable;
int32_t index_format = data->ReadUShort(index_sub_table_offset);
IndexSubTablePtr new_table;
ReadableFontDataPtr new_data;
switch (index_format) {
case 1:
new_table = CreateTable<IndexSubTableFormat1>(data,
index_sub_table_offset,
first_glyph_index,
last_glyph_index);
break;
case 2:
new_table = CreateTable<IndexSubTableFormat2>(data,
index_sub_table_offset,
first_glyph_index,
last_glyph_index);
break;
case 3:
new_table = CreateTable<IndexSubTableFormat3>(data,
index_sub_table_offset,
first_glyph_index,
last_glyph_index);
break;
case 4:
new_table = CreateTable<IndexSubTableFormat4>(data,
index_sub_table_offset,
first_glyph_index,
last_glyph_index);
break;
case 5:
new_table = CreateTable<IndexSubTableFormat5>(data,
index_sub_table_offset,
first_glyph_index,
last_glyph_index);
break;
default:
// Unknown format and unable to process.
#if !defined (SFNTLY_NO_EXCEPTION)
throw IllegalArgumentException("Invalid Index Subtable Format");
#endif
break;
}
return new_table.Detach();
}
IndexSubTable::IndexSubTable(ReadableFontData* data,
int32_t first,
int32_t last)
: SubTable(data), first_glyph_index_(first), last_glyph_index_(last) {
index_format_ =
data_->ReadUShort(EblcTable::Offset::kIndexSubHeader_indexFormat);
image_format_ =
data_->ReadUShort(EblcTable::Offset::kIndexSubHeader_imageFormat);
image_data_offset_ =
data_->ReadULongAsInt(EblcTable::Offset::kIndexSubHeader_imageDataOffset);
}
} // namespace sfntly
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