Start font reading support.

src/fonts/FontReader.cpp

@@ -0,0 +1,181 @@
+#include "FontReader.h"
+#include "TrueTypeFont.h"
+
+#include "File.h"
+#include "BinaryStream.h"
+
+#include <iostream>
+#include <sstream>
+
+FontReader::~FontReader()
+{
+
+}
+
+void FontReader::setPath(const std::string& path)
+{
+    mPath = path;
+}
+
+bool FontReader::readOffsetSubtable()
+{
+    mOffsetSubtable.scaler_type = *BinaryStream::getNextDWord(mFile->GetInHandle());
+    mCurrentOffset += 4;
+
+    mOffsetSubtable.num_tables = *BinaryStream::getNextWord(mFile->GetInHandle());
+    mCurrentOffset += 2;
+
+    mOffsetSubtable.search_range = *BinaryStream::getNextWord(mFile->GetInHandle());
+    mCurrentOffset += 2;
+
+    mOffsetSubtable.entry_selector = *BinaryStream::getNextWord(mFile->GetInHandle());
+    mCurrentOffset += 2;
+
+    mOffsetSubtable.range_shift = *BinaryStream::getNextWord(mFile->GetInHandle());
+    mCurrentOffset += 2;
+
+    return true;
+}
+
+void FontReader::logOffsetSubtable()
+{
+    std::stringstream sstr;
+    sstr << "Offset Subtable\n";
+    sstr << "scaler_type: " << mOffsetSubtable.scaler_type << "\n";
+
+    sstr << "num_tables: " << mOffsetSubtable.num_tables << "\n";
+
+    sstr << "search_range: " << mOffsetSubtable.search_range << "\n";
+
+    sstr << "entry_selector: " << mOffsetSubtable.entry_selector << "\n";
+
+    sstr << "range_shift: " << mOffsetSubtable.range_shift << "\n";
+    sstr << "************\n";
+    std::cout << sstr.str() << std::endl;
+}
+
+void FontReader::readTableDirectory()
+{
+    mTables.clear();
+    for (unsigned idx=0; idx<mOffsetSubtable.num_tables; idx++)
+    {
+        Table table;
+        BinaryStream::getNextString(mFile->GetInHandle(), table.name, 4);
+        mCurrentOffset += 4;
+
+        table.checksum = *BinaryStream::getNextDWord(mFile->GetInHandle());
+        mCurrentOffset += 4;
+
+        table.offset = *BinaryStream::getNextDWord(mFile->GetInHandle());
+        mCurrentOffset += 4;
+
+        table.length = *BinaryStream::getNextDWord(mFile->GetInHandle());
+        mCurrentOffset += 4;
+
+        logTable(table);
+        mTables.push_back(table);
+    }
+}
+
+void FontReader::logTable(const Table& table)
+{
+    std::stringstream sstr;
+    sstr << "Table\n";
+    sstr << "name: " << table.name << "\n";
+
+    sstr << "checksum: " << table.checksum << "\n";
+
+    sstr << "offset: " << table.offset << "\n";
+
+    sstr << "length: " << table.length << "\n";
+    sstr << "************\n";
+    std::cout << sstr.str() << std::endl;
+}
+
+void FontReader::readTable()
+{
+    std::string working_table_name;
+    for (const auto& table : mTables)
+    {
+        if (mCurrentOffset == table.offset)
+        {
+            working_table_name = table.name;
+            break;
+        }
+    }
+
+    if (working_table_name == "head")
+    {
+        readHeadTable();
+    }
+
+}
+
+void FontReader::readHeadTable()
+{
+    std::cout << "Reading head table" << std::endl;
+
+    TrueTypeFont::HeadTable table;
+
+    table.version = *BinaryStream::getNextDWord(mFile->GetInHandle());
+    table.fontRevision = *BinaryStream::getNextDWord(mFile->GetInHandle());
+    table.checksumAdjustment = *BinaryStream::getNextDWord(mFile->GetInHandle());
+    table.magicNumber = *BinaryStream::getNextDWord(mFile->GetInHandle());
+    mCurrentOffset += 16;
+
+    table.flags = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.unitsPerEm = *BinaryStream::getNextWord(mFile->GetInHandle());
+    mCurrentOffset += 4;
+
+    table.created = *BinaryStream::getNextQWord(mFile->GetInHandle());
+    table.modified = *BinaryStream::getNextQWord(mFile->GetInHandle());
+    mCurrentOffset += 16;
+
+    table.xMin = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.yMin = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.xMax = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.yMax = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.macStyle = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.lowestRecPPEM = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.fontDirectionHint = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.indexToLocFormat = *BinaryStream::getNextWord(mFile->GetInHandle());
+    table.glyphDataFormat = *BinaryStream::getNextWord(mFile->GetInHandle());
+
+    mCurrentOffset += 18;
+
+    auto working_ttf_font = dynamic_cast<TrueTypeFont*>(mWorkingFont.get());
+    working_ttf_font->setHeadTable(table);
+    std::cout << working_ttf_font->logHeadTable() << std::endl;
+}
+
+
+std::unique_ptr<IFont> FontReader::read()
+{
+    mWorkingFont = std::make_unique<TrueTypeFont>();
+
+    mFile = std::make_unique<File>(mPath);
+    mFile->Open(true);
+
+    readOffsetSubtable();
+    std::cout << "Current offset: " << mCurrentOffset << std::endl;
+
+    logOffsetSubtable();
+
+    readTableDirectory();
+    std::cout << "Current offset: " << mCurrentOffset << std::endl;
+
+    for (unsigned idx=0; idx<mOffsetSubtable.num_tables; idx++)
+    {
+        readTable();
+        std::cout << "Current offset: " << mCurrentOffset << std::endl;
+        break;
+    }
+
+    mFile->Close();
+
+
+
+
+    return std::move(mWorkingFont);
+}
+