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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_VCL_EMBEDDEDFONTSHELPER_HXX
#define INCLUDED_VCL_EMBEDDEDFONTSHELPER_HXX
#include <vcl/dllapi.h>
#include <rtl/ustring.hxx>
#include <tools/fontenum.hxx>
#include <tools/long.hxx>
#include <string_view>
#include <vector>
namespace com::sun::star::io { class XInputStream; }
namespace com::sun::star::uno { template <typename > class Reference; }
/**
Helper functions for handling embedded fonts in documents.
*/
class VCL_DLLPUBLIC EmbeddedFontsHelper
{
private:
std::vector<std::pair<OUString, OUString>> m_aAccumulatedFonts;
/**
Adds the given font to the list of known fonts. The font is used only until application
exit.
@param fontName name of the font (e.g. 'Times New Roman')
@param fileUrl URL of the font file
*/
static void activateFont( const OUString& fontName, const OUString& fileUrl );
public:
/// Specification of what kind of operation is allowed when embedding a font
enum class FontRights
{
ViewingAllowed, ///< Font may be embedded for viewing the document (but not editing)
EditingAllowed ///< Font may be embedded for editing document (implies viewing)
};
/**
Returns URL for a font file for the given font, or empty if it does not exist.
*/
static OUString fontFileUrl(
std::u16string_view familyName, FontFamily family, FontItalic italic,
FontWeight weight, FontPitch pitch, FontRights rights );
/**
Reads a font from the input stream, saves it to a temporary font file and adds it to the list of
fonts that activateFonts will activate.
@param stream stream of font data
@param fontName name of the font (e.g. 'Times New Roman')
@param extra additional text to use for name (e.g. to distinguish regular from bold, italic,...), "?" for unique
@param key key to xor the data with, from the start until the key's length (not repeated)
@param eot whether the data is compressed in Embedded OpenType format
*/
bool addEmbeddedFont( const css::uno::Reference< css::io::XInputStream >& stream,
const OUString& fontName, const char* extra,
std::vector< unsigned char > const & key, bool eot = false);
/**
Returns a URL for a file where to store contents of a given temporary font.
The file may or not may not exist yet, and will be cleaned up automatically as appropriate.
Use activateTemporaryFont() to actually enable usage of the font.
@param fontName name of the font (e.g. 'Times New Roman')
@param extra additional text to use for name (e.g. to distinguish regular from bold, italic,...), "?" for unique
*/
static OUString fileUrlForTemporaryFont( const OUString& fontName, const char* extra );
/**
Adds the accumulated fonts to the list of known fonts. The fonts are used only until application
exit.
*/
void activateFonts();
/**
Returns if the restrictions specified in the font (if present) allow embedding
the font for a particular purpose.
@param data font data
@param size size of the font data
@param rights type of operation to be allowed for the font
*/
static bool sufficientTTFRights( const void* data, tools::Long size, FontRights rights );
/**
Removes all temporary fonts in the path used by fileUrlForTemporaryFont().
@internal
*/
static void clearTemporaryFontFiles();
~EmbeddedFontsHelper() COVERITY_NOEXCEPT_FALSE
{
activateFonts();
}
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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