SkDataTable.h

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/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkDataTable_DEFINED
#define SkDataTable_DEFINED
 
#include "include/core/SkRefCnt.h"
#include "include/private/base/SkAPI.h"
#include "include/private/base/SkAssert.h"
 
#include <cstdint>
#include <cstring>
 
class SK_API SkDataTable : public SkRefCnt {
public:
    bool isEmpty() const { return 0 == fCount; }
 
    int count() const { return fCount; }
 
    size_t atSize(int index) const;
 
    const void* at(int index, size_t* size = nullptr) const;
 
    template <typename T>
    const T* atT(int index, size_t* size = nullptr) const {
        return reinterpret_cast<const T*>(this->at(index, size));
    }
 
    const char* atStr(int index) const {
        size_t size;
        const char* str = this->atT<const char>(index, &size);
        SkASSERT(strlen(str) + 1 == size);
        return str;
    }
 
    typedef void (*FreeProc)(void* context);
 
    static sk_sp<SkDataTable> MakeEmpty();
 
    static sk_sp<SkDataTable> MakeCopyArrays(const void * const * ptrs,
                                             const size_t sizes[], int count);
 
    static sk_sp<SkDataTable> MakeCopyArray(const void* array, size_t elemSize, int count);
 
    static sk_sp<SkDataTable> MakeArrayProc(const void* array, size_t elemSize, int count,
                                            FreeProc proc, void* context);
 
private:
    struct Dir {
        const void* fPtr;
        uintptr_t   fSize;
    };
 
    int         fCount;
    size_t      fElemSize;
    union {
        const Dir*  fDir;
        const char* fElems;
    } fU;
 
    FreeProc    fFreeProc;
    void*       fFreeProcContext;
 
    SkDataTable();
    SkDataTable(const void* array, size_t elemSize, int count,
                FreeProc, void* context);
    SkDataTable(const Dir*, int count, FreeProc, void* context);
    ~SkDataTable() override;
 
    friend class SkDataTableBuilder;    // access to Dir
 
    using INHERITED = SkRefCnt;
};
 
#endif