175 lines
4.7 KiB
C++
175 lines
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Scott MacGregor <mscott@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsIconDecoder.h"
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#include "nsIInputStream.h"
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#include "imgIContainer.h"
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#include "imgIContainerObserver.h"
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#include "imgILoad.h"
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#include "nspr.h"
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#include "nsIComponentManager.h"
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#include "nsRect.h"
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NS_IMPL_THREADSAFE_ADDREF(nsIconDecoder)
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NS_IMPL_THREADSAFE_RELEASE(nsIconDecoder)
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NS_INTERFACE_MAP_BEGIN(nsIconDecoder)
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NS_INTERFACE_MAP_ENTRY(imgIDecoder)
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NS_INTERFACE_MAP_END_THREADSAFE
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nsIconDecoder::nsIconDecoder()
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{
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}
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nsIconDecoder::~nsIconDecoder()
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{ }
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/** imgIDecoder methods **/
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NS_IMETHODIMP nsIconDecoder::Init(imgILoad *aLoad)
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{
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mObserver = do_QueryInterface(aLoad); // we're holding 2 strong refs to the request.
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mImage = do_CreateInstance("@mozilla.org/image/container;1");
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if (!mImage) return NS_ERROR_OUT_OF_MEMORY;
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aLoad->SetImage(mImage);
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mFrame = do_CreateInstance("@mozilla.org/gfx/image/frame;2");
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if (!mFrame) return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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NS_IMETHODIMP nsIconDecoder::Close()
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{
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if (mObserver)
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{
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mObserver->OnStopFrame(nsnull, mFrame);
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mObserver->OnStopContainer(nsnull, mImage);
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mObserver->OnStopDecode(nsnull, NS_OK, nsnull);
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}
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return NS_OK;
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}
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NS_IMETHODIMP nsIconDecoder::Flush()
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP nsIconDecoder::WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *_retval)
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{
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nsresult rv;
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char *buf = (char *)PR_Malloc(count);
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if (!buf) return NS_ERROR_OUT_OF_MEMORY; /* we couldn't allocate the object */
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// read the data from the input stram...
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PRUint32 readLen;
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rv = inStr->Read(buf, count, &readLen);
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char *data = buf;
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if (NS_FAILED(rv)) return rv;
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// since WriteFrom is only called once, go ahead and fire the on start notifications..
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mObserver->OnStartDecode(nsnull);
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PRUint32 i = 0;
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// Read size
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PRInt32 w, h;
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w = data[0];
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h = data[1];
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data += 2;
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readLen -= i + 2;
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mImage->Init(w, h, mObserver);
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if (mObserver)
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mObserver->OnStartContainer(nsnull, mImage);
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rv = mFrame->Init(0, 0, w, h, gfxIFormats::RGB_A1, 24);
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if (NS_FAILED(rv))
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return rv;
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mImage->AppendFrame(mFrame);
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if (mObserver)
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mObserver->OnStartFrame(nsnull, mFrame);
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PRUint32 bpr, abpr;
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PRInt32 width, height;
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mFrame->GetImageBytesPerRow(&bpr);
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mFrame->GetAlphaBytesPerRow(&abpr);
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mFrame->GetWidth(&width);
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mFrame->GetHeight(&height);
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i = 0;
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PRInt32 rownum = 0; // XXX this better not have a decimal
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PRInt32 wroteLen = 0;
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do
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{
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PRUint8 *line = (PRUint8*)data + i*bpr;
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mFrame->SetImageData(line, bpr, (rownum++)*bpr);
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nsIntRect r(0, rownum, width, 1);
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mObserver->OnDataAvailable(nsnull, mFrame, &r);
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wroteLen += bpr ;
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i++;
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} while(rownum < height);
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// now we want to send in the alpha data...
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for (rownum = 0; rownum < height; rownum ++)
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{
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PRUint8 * line = (PRUint8*) data + abpr * rownum + height*bpr;
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mFrame->SetAlphaData(line, abpr, (rownum)*abpr);
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}
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PR_FREEIF(buf);
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return NS_OK;
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}
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