mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
163 lines
4.6 KiB
C++
163 lines
4.6 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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* Bobby Holley <bobbyholley@gmail.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 "RasterImage.h"
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#include "imgIContainerObserver.h"
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#include "nspr.h"
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#include "nsRect.h"
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#include "ImageErrors.h"
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namespace mozilla {
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namespace imagelib {
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nsIconDecoder::nsIconDecoder() :
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mWidth(-1),
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mHeight(-1),
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mPixBytesRead(0),
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mPixBytesTotal(0),
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mImageData(nsnull),
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mState(iconStateStart)
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{
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// Nothing to do
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}
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nsIconDecoder::~nsIconDecoder()
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{ }
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void
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nsIconDecoder::WriteInternal(const char *aBuffer, PRUint32 aCount)
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{
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NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
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// We put this here to avoid errors about crossing initialization with case
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// jumps on linux.
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PRUint32 bytesToRead = 0;
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nsresult rv;
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// Performance isn't critical here, so our update rectangle is
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// always the full icon
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nsIntRect r(0, 0, mWidth, mHeight);
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// Loop until the input data is gone
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while (aCount > 0) {
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switch (mState) {
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case iconStateStart:
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// Grab the width
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mWidth = (PRUint8)*aBuffer;
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// Book Keeping
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aBuffer++;
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aCount--;
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mState = iconStateHaveHeight;
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break;
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case iconStateHaveHeight:
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// Grab the Height
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mHeight = (PRUint8)*aBuffer;
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// Post our size to the superclass
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PostSize(mWidth, mHeight);
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// If We're doing a size decode, we're done
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if (IsSizeDecode()) {
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mState = iconStateFinished;
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break;
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}
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// Add the frame and signal
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rv = mImage->AppendFrame(0, 0, mWidth, mHeight,
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gfxASurface::ImageFormatARGB32,
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&mImageData, &mPixBytesTotal);
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if (NS_FAILED(rv)) {
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PostDecoderError(rv);
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return;
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}
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// Tell the superclass we're starting a frame
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PostFrameStart();
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// Book Keeping
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aBuffer++;
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aCount--;
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mState = iconStateReadPixels;
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break;
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case iconStateReadPixels:
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// How many bytes are we reading?
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bytesToRead = PR_MIN(aCount, mPixBytesTotal - mPixBytesRead);
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// Copy the bytes
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memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
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// Invalidate
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PostInvalidation(r);
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// Book Keeping
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aBuffer += bytesToRead;
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aCount -= bytesToRead;
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mPixBytesRead += bytesToRead;
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// If we've got all the pixel bytes, we're finished
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if (mPixBytesRead == mPixBytesTotal) {
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PostFrameStop();
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PostDecodeDone();
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mState = iconStateFinished;
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}
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break;
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case iconStateFinished:
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// Consume all excess data silently
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aCount = 0;
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break;
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}
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}
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}
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} // namespace imagelib
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} // namespace mozilla
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