зеркало из https://github.com/mozilla/gecko-dev.git
135 строки
3.2 KiB
C++
135 строки
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 "nspr.h"
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#include "nsRect.h"
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#include "nsError.h"
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#include <algorithm>
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namespace mozilla {
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namespace image {
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nsIconDecoder::nsIconDecoder(RasterImage &aImage, imgDecoderObserver* aObserver)
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: Decoder(aImage, aObserver),
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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(nullptr),
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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, uint32_t 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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uint32_t 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 = (uint8_t)*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 = (uint8_t)*aBuffer;
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// Post our size to the superclass
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PostSize(mWidth, mHeight);
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if (HasError()) {
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// Setting the size led to an error.
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mState = iconStateFinished;
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return;
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}
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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.EnsureFrame(0, 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 = std::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 image
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} // namespace mozilla
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