65a9344120
Bug: skia: Change-Id: If8c689c008438efed398d018782021195f6d0274 Reviewed-on: https://skia-review.googlesource.com/19261 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com>
115 lines
4.0 KiB
C++
115 lines
4.0 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkFontConfigInterface_DEFINED
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#define SkFontConfigInterface_DEFINED
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#include "SkFontStyle.h"
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#include "SkRefCnt.h"
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#include "SkTypeface.h"
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class SkFontMgr;
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/**
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* \class SkFontConfigInterface
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*
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* A simple interface for remotable font management.
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* The global instance can be found with RefGlobal().
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*/
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class SK_API SkFontConfigInterface : public SkRefCnt {
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public:
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/**
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* Returns the global SkFontConfigInterface instance. If it is not
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* nullptr, calls ref() on it. The caller must balance this with a call to
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* unref(). The default SkFontConfigInterface is the result of calling
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* GetSingletonDirectInterface.
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*/
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static SkFontConfigInterface* RefGlobal();
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/**
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* Replace the current global instance with the specified one, safely
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* ref'ing the new instance, and unref'ing the previous. Returns its
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* parameter (the new global instance).
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*/
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static SkFontConfigInterface* SetGlobal(SkFontConfigInterface*);
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/**
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* This should be treated as private to the impl of SkFontConfigInterface.
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* Callers should not change or expect any particular values. It is meant
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* to be a union of possible storage types to aid the impl.
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*/
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struct FontIdentity {
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FontIdentity() : fID(0), fTTCIndex(0) {}
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bool operator==(const FontIdentity& other) const {
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return fID == other.fID &&
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fTTCIndex == other.fTTCIndex &&
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fString == other.fString;
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}
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bool operator!=(const FontIdentity& other) const {
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return !(*this == other);
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}
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uint32_t fID;
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int32_t fTTCIndex;
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SkString fString;
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SkFontStyle fStyle;
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// If buffer is NULL, just return the number of bytes that would have
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// been written. Will pad contents to a multiple of 4.
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size_t writeToMemory(void* buffer = NULL) const;
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// Recreate from a flattened buffer, returning the number of bytes read.
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size_t readFromMemory(const void* buffer, size_t length);
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};
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/**
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* Given a familyName and style, find the best match.
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*
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* If a match is found, return true and set its outFontIdentifier.
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* If outFamilyName is not null, assign the found familyName to it
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* (which may differ from the requested familyName).
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* If outStyle is not null, assign the found style to it
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* (which may differ from the requested style).
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*
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* If a match is not found, return false, and ignore all out parameters.
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*/
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virtual bool matchFamilyName(const char familyName[],
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SkFontStyle requested,
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FontIdentity* outFontIdentifier,
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SkString* outFamilyName,
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SkFontStyle* outStyle) = 0;
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/**
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* Given a FontRef, open a stream to access its data, or return null
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* if the FontRef's data is not available. The caller is responsible for
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* deleting the stream when it is done accessing the data.
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*/
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virtual SkStreamAsset* openStream(const FontIdentity&) = 0;
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/**
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* Return an SkTypeface for the given FontIdentity.
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*
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* The default implementation simply returns a new typeface built using data obtained from
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* openStream(), but derived classes may implement more complex caching schemes.
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*/
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virtual sk_sp<SkTypeface> makeTypeface(const FontIdentity& identity) {
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return SkTypeface::MakeFromStream(this->openStream(identity), identity.fTTCIndex);
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}
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/**
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* Return a singleton instance of a direct subclass that calls into
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* libfontconfig. This does not affect the refcnt of the returned instance.
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*/
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static SkFontConfigInterface* GetSingletonDirectInterface();
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typedef SkRefCnt INHERITED;
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};
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#endif
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