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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_FONT_FACTORY_H_
#define SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_
#include <vector>
#include "sfntly/port/refcount.h"
#include "sfntly/port/type.h"
#include "sfntly/font.h"
namespace sfntly {
class FontFactory : public RefCounted<FontFactory> {
public:
virtual ~FontFactory();
// Factory method for the construction of a font factory.
static CALLER_ATTACH FontFactory* GetInstance();
// Toggle whether fonts that are loaded are fingerprinted with a SHA-1 hash.
// If a font is fingerprinted then a SHA-1 hash is generated at load time and
// stored in the font. This is useful for uniquely identifying fonts. By
// default this is turned on.
// @param fingerprint whether fingerprinting should be turned on or off
// TODO(arthurhsu): IMPLEMENT: C++ port currently don't do any SHA-1
void FingerprintFont(bool fingerprint);
bool FingerprintFont();
// Load the font(s) from the input stream. The current settings on the factory
// are used during the loading process. One or more fonts are returned if the
// stream contains valid font data. Some font container formats may have more
// than one font and in this case multiple font objects will be returned. If
// the data in the stream cannot be parsed or is invalid an array of size zero
// will be returned.
void LoadFonts(InputStream* is, FontArray* output);
// ByteArray font loading
// Load the font(s) from the byte array. The current settings on the factory
// are used during the loading process. One or more fonts are returned if the
// stream contains valid font data. Some font container formats may have more
// than one font and in this case multiple font objects will be returned. If
// the data in the stream cannot be parsed or is invalid an array of size zero
// will be returned.
void LoadFonts(ByteVector* b, FontArray* output);
// Load the font(s) from the input stream into font builders. The current
// settings on the factory are used during the loading process. One or more
// font builders are returned if the stream contains valid font data. Some
// font container formats may have more than one font and in this case
// multiple font builder objects will be returned. If the data in the stream
// cannot be parsed or is invalid an array of size zero will be returned.
void LoadFontsForBuilding(InputStream* is, FontBuilderArray* output);
// Load the font(s) from the byte array into font builders. The current
// settings on the factory are used during the loading process. One or more
// font builders are returned if the stream contains valid font data. Some
// font container formats may have more than one font and in this case
// multiple font builder objects will be returned. If the data in the stream
// cannot be parsed or is invalid an array of size zero will be returned.
void LoadFontsForBuilding(ByteVector* b, FontBuilderArray* output);
// Font serialization
// Serialize the font to the output stream.
// NOTE: in this port we attempted not to implement I/O stream because dealing
// with cross-platform I/O stream itself is big enough as a project.
// Byte buffer it is.
void SerializeFont(Font* font, OutputStream* os);
// Set the table ordering to be used in serializing a font. The table ordering
// is an ordered list of table ids and tables will be serialized in the order
// given. Any tables whose id is not listed in the ordering will be placed in
// an unspecified order following those listed.
void SetSerializationTableOrdering(const IntegerList& table_ordering);
// Get an empty font builder for creating a new font from scratch.
CALLER_ATTACH Font::Builder* NewFontBuilder();
private:
// Offsets to specific elements in the underlying data. These offsets are
// relative to the start of the table or the start of sub-blocks within the
// table.
struct Offset {
enum {
// Offsets within the main directory.
kTTCTag = 0,
kVersion = 4,
kNumFonts = 8,
kOffsetTable = 12,
// TTC Version 2.0 extensions.
// Offsets from end of OffsetTable.
kulDsigTag = 0,
kulDsigLength = 4,
kulDsigOffset = 8
};
};
FontFactory();
CALLER_ATTACH Font* LoadSingleOTF(InputStream* is);
CALLER_ATTACH Font* LoadSingleOTF(WritableFontData* wfd);
void LoadCollection(InputStream* is, FontArray* output);
void LoadCollection(WritableFontData* wfd, FontArray* output);
CALLER_ATTACH Font::Builder* LoadSingleOTFForBuilding(InputStream* is);
CALLER_ATTACH Font::Builder*
LoadSingleOTFForBuilding(WritableFontData* wfd,
int32_t offset_to_offset_table);
void LoadCollectionForBuilding(InputStream* is, FontBuilderArray* builders);
void LoadCollectionForBuilding(WritableFontData* ba,
FontBuilderArray* builders);
static bool IsCollection(PushbackInputStream* pbis);
static bool IsCollection(ReadableFontData* wfd);
bool fingerprint_;
IntegerList table_ordering_;
};
typedef Ptr<FontFactory> FontFactoryPtr;
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_
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