IAIAutoBuffer.h Go to the documentation of this file. /* * Name: IAIAutoBuffer.h * $Revision: 1 $ * Author: * Date: * Purpose: * * ADOBE SYSTEMS INCORPORATED * Copyright 2004-2007 Adobe Systems Incorporated. * All rights reserved. * * NOTICE: Adobe permits you to use, modify, and distribute this file * in accordance with the terms of the Adobe license agreement * accompanying it. If you have received this file from a source other * than Adobe, then your use, modification, or distribution of it * requires the prior written permission of Adobe. * */ #ifndef _IAIAUTOBUFFER_H_ #define _IAIAUTOBUFFER_H_ #include <string> namespace ai { class SPAlloc { public: static void* AllocateBlock(size_t byteCount); static void DeleteBlock(void* block); }; /* Notes: elem's type must be limited to POD (plain old data) types for AutoBuffer objects * that are to be passed across the Illustrator SuitePea suite boundary. This is required as the * ctor and dtor for non-POD types are not available on both sides of this boundary. For single-side * of the API boundary usage, clients are free to construct AutoBuffers of any type. * * In order for AutoBuffer to function properly across the Illustrator plug-in API boundary, * the provided SPAlloc class definition must be used. Allocations MUST be done using the * SPBlocks suite. * * std::vector is not used because AI has no control over the default allocator for the vector and * the implementations of std::vector could be different on each side of the API boundary causing problems. */ template<class elem, typename size_type=size_t, class A=SPAlloc> class AutoBuffer { public: explicit AutoBuffer (size_type count = 0) : fCapacity(count), fBuffer(0) { if ( fCapacity > 0 ) { fBuffer = reinterpret_cast<elem*>(A::AllocateBlock(ByteCount(fCapacity))); Init(); } } AutoBuffer (const AutoBuffer& b) : fCapacity(b.fCapacity), fBuffer(0) { if ( fCapacity > 0 ) { fBuffer = reinterpret_cast<elem*>(A::AllocateBlock(ByteCount(fCapacity))); Copy(b.fBuffer); } } ~AutoBuffer () { if ( fBuffer ) { Destroy(fBuffer); A::DeleteBlock(fBuffer); } } bool IsValid () const { return fBuffer != 0; } elem* GetBuffer () const { return fBuffer; } operator elem* () const { return GetBuffer(); } elem& operator[] (size_type n) { return fBuffer[n]; } size_type GetCount () const { return fCapacity; } void Resize (size_type newSize) { if ( newSize != fCapacity ) { elem *newBuffer = reinterpret_cast<elem*>(A::AllocateBlock(ByteCount(newSize))); if ( fBuffer ) { elem* oldBuffer = fBuffer; fBuffer = newBuffer; Copy(oldBuffer, 0, fCapacity < newSize ? fCapacity : newSize ); // initialize any new elements Init(fCapacity, newSize); Destroy(oldBuffer, 0, fCapacity); A::DeleteBlock(oldBuffer); } else { fBuffer = newBuffer; Init(); } fCapacity = newSize; } } AutoBuffer& operator= (const AutoBuffer& rhs) { if ( this != &rhs ) { if ( fCapacity != rhs.fCapacity ) { Destroy(fBuffer); A::DeleteBlock(fBuffer); fBuffer = reinterpret_cast<elem*>(A::AllocateBlock(ByteCount(rhs.fCapacity))); fCapacity = rhs.fCapacity; } Copy(rhs.fBuffer); } return *this; } static size_type lastIndex () { return size_type(-1); } private: void Init (size_type start = 0, size_type end = lastIndex()) { size_type elemCount = (end == lastIndex() ? GetCount() : end); for (size_type i = start; i < elemCount; ++i) { // invoke the constructor on each element new (&fBuffer[i])elem; } } void Destroy (elem* e, size_type start = 0, size_type end = lastIndex()) { size_type elemCount = (end == lastIndex() ? GetCount() : end); for (size_type i = start; i < elemCount; ++i) { e[i].~elem(); } } void Copy (const elem* e, size_type start = 0, size_type end = lastIndex()) { size_type elemCount = (end == lastIndex() ? GetCount() : end); for (size_type i = start; i < elemCount; ++i) { fBuffer[i] = e[i]; } } size_type ByteCount (size_type elemCount) { return elemCount * sizeof(elem); } private: size_type fCapacity; elem* fBuffer; }; } // end of namespace ai #endif // _IAIAUTOBUFFER_H_

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