RetroZilla/modules/libpr0n/decoders/icon/nsIconDecoder.cpp
2015-10-20 23:03:22 -04:00

163 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Scott MacGregor <mscott@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsIconDecoder.h"
#include "nsIInputStream.h"
#include "imgIContainer.h"
#include "imgIContainerObserver.h"
#include "imgILoad.h"
#include "nspr.h"
#include "nsIComponentManager.h"
#include "nsRect.h"
NS_IMPL_THREADSAFE_ADDREF(nsIconDecoder)
NS_IMPL_THREADSAFE_RELEASE(nsIconDecoder)
NS_INTERFACE_MAP_BEGIN(nsIconDecoder)
NS_INTERFACE_MAP_ENTRY(imgIDecoder)
NS_INTERFACE_MAP_END_THREADSAFE
nsIconDecoder::nsIconDecoder()
{
}
nsIconDecoder::~nsIconDecoder()
{ }
/** imgIDecoder methods **/
NS_IMETHODIMP nsIconDecoder::Init(imgILoad *aLoad)
{
mObserver = do_QueryInterface(aLoad); // we're holding 2 strong refs to the request.
mImage = do_CreateInstance("@mozilla.org/image/container;1");
if (!mImage) return NS_ERROR_OUT_OF_MEMORY;
aLoad->SetImage(mImage);
mFrame = do_CreateInstance("@mozilla.org/gfx/image/frame;2");
if (!mFrame) return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
NS_IMETHODIMP nsIconDecoder::Close()
{
if (mObserver)
{
mObserver->OnStopFrame(nsnull, mFrame);
mObserver->OnStopContainer(nsnull, mImage);
mObserver->OnStopDecode(nsnull, NS_OK, nsnull);
}
return NS_OK;
}
NS_IMETHODIMP nsIconDecoder::Flush()
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsIconDecoder::WriteFrom(nsIInputStream *inStr, PRUint32 count, PRUint32 *_retval)
{
nsresult rv;
PRUint8 * const buf = (PRUint8 *)PR_Malloc(count);
if (!buf) return NS_ERROR_OUT_OF_MEMORY; /* we couldn't allocate the object */
// read the data from the input stram...
PRUint32 readLen;
rv = inStr->Read((char*)buf, count, &readLen);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(readLen >= 3, NS_ERROR_UNEXPECTED); // w, h, alphaBits
PRUint8 * const buf_end = buf + readLen;
PRUint8 *data = buf;
// since WriteFrom is only called once, go ahead and fire the on start notifications..
mObserver->OnStartDecode(nsnull);
// Read size
PRInt32 w = *(data++);
PRInt32 h = *(data++);
PRUint8 alphaBits = *(data++);
NS_ENSURE_TRUE(w > 0 && h > 0 && (alphaBits == 1 || alphaBits == 8),
NS_ERROR_UNEXPECTED);
mImage->Init(w, h, mObserver);
if (mObserver)
mObserver->OnStartContainer(nsnull, mImage);
gfx_format format = alphaBits == 1 ? gfx_format(gfxIFormats::RGB_A1)
: gfx_format(gfxIFormats::RGB_A8);
rv = mFrame->Init(0, 0, w, h, format, 24);
if (NS_FAILED(rv))
return rv;
mImage->AppendFrame(mFrame);
if (mObserver)
mObserver->OnStartFrame(nsnull, mFrame);
PRUint32 bpr, abpr;
PRInt32 width, height;
mFrame->GetImageBytesPerRow(&bpr);
mFrame->GetAlphaBytesPerRow(&abpr);
mFrame->GetWidth(&width);
mFrame->GetHeight(&height);
NS_ENSURE_TRUE(buf_end - data >= PRInt32(bpr + abpr) * height,
NS_ERROR_UNEXPECTED);
PRInt32 rownum;
for (rownum = 0; rownum < height; ++rownum, data += bpr)
mFrame->SetImageData(data, bpr, rownum * bpr);
for (rownum = 0; rownum < height; ++rownum, data += abpr)
mFrame->SetAlphaData(data, abpr, rownum * abpr);
nsIntRect r(0, 0, width, height);
mObserver->OnDataAvailable(nsnull, mFrame, &r);
PR_Free(buf);
return NS_OK;
}