widget/nsTransferable.h
author cku <cku@mozilla.com>
Fri, 05 May 2017 17:19:43 +0800
changeset 359137 f3460d42d23cb21093146a2ace98009d581bd77a
parent 318108 bd7461a1ed09447f4d38b4911f0e83933f9d875b
child 372947 0ff0ccbd52c1ed0cacf159192775c0a43d095435
permissions -rw-r--r--
Bug 1351440 - Part 2. Encapsulate DrawResult and imgIContainer::FLAG_* into imgDrawingParams, and pass it to PaintSVG. r=jwatt The DrawResult return was not in fact anything to do with the success or failure of that method, but was actually passing out a very specific piece of information about the success or failure of any imagelib drawing that may not have occurred under the various PaintSVG calls. The signature of PaintSVG is changed from DrawResult PaintSVG(...., uint32 flags); to void PaintSVG(...., imgDrawingParams& aPackage); imgDrawingParams wraps DrawResult and imgIContainer::FLAG_* as a pack, pass through PaintSVG to imagelib draw calls under beneath. MozReview-Commit-ID: IOq2evUAOQF

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsTransferable_h__
#define nsTransferable_h__

#include "nsIContentPolicyBase.h"
#include "nsIFormatConverter.h"
#include "nsITransferable.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsIPrincipal.h"

class nsIMutableArray;
class nsString;

//
// DataStruct
//
// Holds a flavor (a mime type) that describes the data and the associated data.
//
struct DataStruct
{
  explicit DataStruct ( const char* aFlavor )
    : mDataLen(0), mFlavor(aFlavor), mCacheFileName(nullptr) { }
  ~DataStruct();
  
  const nsCString& GetFlavor() const { return mFlavor; }
  void SetData( nsISupports* inData, uint32_t inDataLen, bool aIsPrivateData );
  void GetData( nsISupports** outData, uint32_t *outDataLen );
  already_AddRefed<nsIFile> GetFileSpec(const char* aFileName);
  bool IsDataAvailable() const { return (mData && mDataLen > 0) || (!mData && mCacheFileName); }
  
protected:

  enum {
    // The size of data over which we write the data to disk rather than
    // keep it around in memory.
    kLargeDatasetSize = 1000000        // 1 million bytes
  };
  
  nsresult WriteCache(nsISupports* aData, uint32_t aDataLen );
  nsresult ReadCache(nsISupports** aData, uint32_t* aDataLen );
  
  nsCOMPtr<nsISupports> mData;   // OWNER - some varient of primitive wrapper
  uint32_t mDataLen;
  const nsCString mFlavor;
  char *   mCacheFileName;

};

/**
 * XP Transferable wrapper
 */

class nsTransferable : public nsITransferable
{
public:

  nsTransferable();

    // nsISupports
  NS_DECL_ISUPPORTS
  NS_DECL_NSITRANSFERABLE

protected:
  virtual ~nsTransferable();

    // get flavors w/out converter
  already_AddRefed<nsIMutableArray> GetTransferDataFlavors();
 
  nsTArray<DataStruct> mDataArray;
  nsCOMPtr<nsIFormatConverter> mFormatConv;
  bool mPrivateData;
  nsCOMPtr<nsIPrincipal> mRequestingPrincipal;
  nsContentPolicyType mContentPolicyType;
#if DEBUG
  bool mInitialized;
#endif

};

#endif // nsTransferable_h__