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/* libs/graphics/ports/SkFontHost_fontconfig_impl.h
**
** Copyright 2009, Google Inc.
**
** 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.
*/
/* The SkFontHost_fontconfig code requires an implementation of an abstact
* fontconfig interface. We do this because sometimes fontconfig is not
* directly availible and this provides an ability to change the fontconfig
* implementation at run-time.
*/
#ifndef FontConfigInterface_DEFINED
#define FontConfigInterface_DEFINED
#include <string>
class FontConfigInterface {
public:
virtual ~FontConfigInterface() { }
/** Performs config match
*
* @param result_family (optional, set to NULL to ignore, output)
* on success, set to the resulting family name.
* @param result_filefaceid (optional, set to NULL to ignore, output)
* on success, set to the resulting fileface id.
* @param filefaceid_valid if true, then |filefaceid| is valid
* @param filefaceid the filefaceid (as returned by this function)
* which we are trying to match.
* @param family (optional) the family of the font that we are trying to
* match. If the length of the |family| is greater then
* kMaxFontFamilyLength, this function should immediately return false.
* @param characters (optional) UTF-16 characters the font must cover.
* @param characters_bytes (optional) number of bytes in |characters|
* @param is_bold (optional, set to NULL to ignore, in/out)
* @param is_italic (optional, set to NULL to ignore, in/out)
* @return true iff successful.
* Note that |filefaceid| uniquely identifies <font file, face_index) :
* system font: filefaceid =
* (fileid(unique per font file) << 4 | face_index)
* remote font: filefaceid = fileid
*/
virtual bool Match(
std::string* result_family,
unsigned* result_filefaceid,
bool filefaceid_valid,
unsigned filefaceid,
const std::string& family,
const void* characters,
size_t characters_bytes,
bool* is_bold,
bool* is_italic) = 0;
/** Open a font file given the filefaceid as returned by Match.
*/
virtual int Open(unsigned filefaceid) = 0;
static const unsigned kMaxFontFamilyLength = 2048;
};
#endif // FontConfigInterface_DEFINED
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