Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 605 insertions, 0 deletions

diff --git a/image/decoders/nsWebPDecoder.cpp b/image/decoders/nsWebPDecoder.cpp
new file mode 100644
index 0000000000..e7467f0066
--- /dev/null
+++ b/image/decoders/nsWebPDecoder.cpp
@@ -0,0 +1,605 @@
+/* -*- 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/. */
+
+#include "ImageLogging.h"  // Must appear first
+#include "gfxPlatform.h"
+#include "mozilla/TelemetryHistogramEnums.h"
+#include "nsWebPDecoder.h"
+
+#include "RasterImage.h"
+#include "SurfacePipeFactory.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace image {
+
+static LazyLogModule sWebPLog("WebPDecoder");
+
+nsWebPDecoder::nsWebPDecoder(RasterImage* aImage)
+    : Decoder(aImage),
+      mDecoder(nullptr),
+      mBlend(BlendMethod::OVER),
+      mDisposal(DisposalMethod::KEEP),
+      mTimeout(FrameTimeout::Forever()),
+      mFormat(SurfaceFormat::OS_RGBX),
+      mLastRow(0),
+      mCurrentFrame(0),
+      mData(nullptr),
+      mLength(0),
+      mIteratorComplete(false),
+      mNeedDemuxer(true),
+      mGotColorProfile(false) {
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::nsWebPDecoder", this));
+}
+
+nsWebPDecoder::~nsWebPDecoder() {
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::~nsWebPDecoder", this));
+  if (mDecoder) {
+    WebPIDelete(mDecoder);
+    WebPFreeDecBuffer(&mBuffer);
+  }
+}
+
+LexerResult nsWebPDecoder::ReadData() {
+  MOZ_ASSERT(mData);
+  MOZ_ASSERT(mLength > 0);
+
+  WebPDemuxer* demuxer = nullptr;
+  bool complete = mIteratorComplete;
+
+  if (mNeedDemuxer) {
+    WebPDemuxState state;
+    WebPData fragment;
+    fragment.bytes = mData;
+    fragment.size = mLength;
+
+    demuxer = WebPDemuxPartial(&fragment, &state);
+    if (state == WEBP_DEMUX_PARSE_ERROR) {
+      MOZ_LOG(
+          sWebPLog, LogLevel::Error,
+          ("[this=%p] nsWebPDecoder::ReadData -- demux parse error\n", this));
+      WebPDemuxDelete(demuxer);
+      return LexerResult(TerminalState::FAILURE);
+    }
+
+    if (state == WEBP_DEMUX_PARSING_HEADER) {
+      WebPDemuxDelete(demuxer);
+      return LexerResult(Yield::NEED_MORE_DATA);
+    }
+
+    if (!demuxer) {
+      MOZ_LOG(sWebPLog, LogLevel::Error,
+              ("[this=%p] nsWebPDecoder::ReadData -- no demuxer\n", this));
+      return LexerResult(TerminalState::FAILURE);
+    }
+
+    complete = complete || state == WEBP_DEMUX_DONE;
+  }
+
+  LexerResult rv(TerminalState::FAILURE);
+  if (!HasSize()) {
+    rv = ReadHeader(demuxer, complete);
+  } else {
+    rv = ReadPayload(demuxer, complete);
+  }
+
+  WebPDemuxDelete(demuxer);
+  return rv;
+}
+
+LexerResult nsWebPDecoder::DoDecode(SourceBufferIterator& aIterator,
+                                    IResumable* aOnResume) {
+  while (true) {
+    SourceBufferIterator::State state = SourceBufferIterator::COMPLETE;
+    if (!mIteratorComplete) {
+      state = aIterator.AdvanceOrScheduleResume(SIZE_MAX, aOnResume);
+
+      // We need to remember since we can't advance a complete iterator.
+      mIteratorComplete = state == SourceBufferIterator::COMPLETE;
+    }
+
+    if (state == SourceBufferIterator::WAITING) {
+      return LexerResult(Yield::NEED_MORE_DATA);
+    }
+
+    LexerResult rv = UpdateBuffer(aIterator, state);
+    if (rv.is<Yield>() && rv.as<Yield>() == Yield::NEED_MORE_DATA) {
+      // We need to check the iterator to see if more is available before
+      // giving up unless we are already complete.
+      if (mIteratorComplete) {
+        MOZ_LOG(sWebPLog, LogLevel::Error,
+                ("[this=%p] nsWebPDecoder::DoDecode -- read all data, "
+                 "but needs more\n",
+                 this));
+        return LexerResult(TerminalState::FAILURE);
+      }
+      continue;
+    }
+
+    return rv;
+  }
+}
+
+LexerResult nsWebPDecoder::UpdateBuffer(SourceBufferIterator& aIterator,
+                                        SourceBufferIterator::State aState) {
+  MOZ_ASSERT(!HasError(), "Shouldn't call DoDecode after error!");
+
+  switch (aState) {
+    case SourceBufferIterator::READY:
+      if (!aIterator.IsContiguous()) {
+        // We need to buffer. This should be rare, but expensive.
+        break;
+      }
+      if (!mData) {
+        // For as long as we hold onto an iterator, we know the data pointers
+        // to the chunks cannot change underneath us, so save the pointer to
+        // the first block.
+        MOZ_ASSERT(mLength == 0);
+        mData = reinterpret_cast<const uint8_t*>(aIterator.Data());
+      }
+      mLength += aIterator.Length();
+      return ReadData();
+    case SourceBufferIterator::COMPLETE:
+      if (!mData) {
+        // We must have hit an error, such as an OOM, when buffering the
+        // first set of encoded data.
+        MOZ_LOG(
+            sWebPLog, LogLevel::Error,
+            ("[this=%p] nsWebPDecoder::DoDecode -- complete no data\n", this));
+        return LexerResult(TerminalState::FAILURE);
+      }
+      return ReadData();
+    default:
+      MOZ_LOG(sWebPLog, LogLevel::Error,
+              ("[this=%p] nsWebPDecoder::DoDecode -- bad state\n", this));
+      return LexerResult(TerminalState::FAILURE);
+  }
+
+  // We need to buffer. If we have no data buffered, we need to get everything
+  // from the first chunk of the source buffer before appending the new data.
+  if (mBufferedData.empty()) {
+    MOZ_ASSERT(mData);
+    MOZ_ASSERT(mLength > 0);
+
+    if (!mBufferedData.append(mData, mLength)) {
+      MOZ_LOG(sWebPLog, LogLevel::Error,
+              ("[this=%p] nsWebPDecoder::DoDecode -- oom, initialize %zu\n",
+               this, mLength));
+      return LexerResult(TerminalState::FAILURE);
+    }
+
+    MOZ_LOG(sWebPLog, LogLevel::Debug,
+            ("[this=%p] nsWebPDecoder::DoDecode -- buffered %zu bytes\n", this,
+             mLength));
+  }
+
+  // Append the incremental data from the iterator.
+  if (!mBufferedData.append(aIterator.Data(), aIterator.Length())) {
+    MOZ_LOG(sWebPLog, LogLevel::Error,
+            ("[this=%p] nsWebPDecoder::DoDecode -- oom, append %zu on %zu\n",
+             this, aIterator.Length(), mBufferedData.length()));
+    return LexerResult(TerminalState::FAILURE);
+  }
+
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::DoDecode -- buffered %zu -> %zu bytes\n",
+           this, aIterator.Length(), mBufferedData.length()));
+  mData = mBufferedData.begin();
+  mLength = mBufferedData.length();
+  return ReadData();
+}
+
+nsresult nsWebPDecoder::CreateFrame(const OrientedIntRect& aFrameRect) {
+  MOZ_ASSERT(HasSize());
+  MOZ_ASSERT(!mDecoder);
+
+  MOZ_LOG(
+      sWebPLog, LogLevel::Debug,
+      ("[this=%p] nsWebPDecoder::CreateFrame -- frame %u, (%d, %d) %d x %d\n",
+       this, mCurrentFrame, aFrameRect.x, aFrameRect.y, aFrameRect.width,
+       aFrameRect.height));
+
+  if (aFrameRect.width <= 0 || aFrameRect.height <= 0) {
+    MOZ_LOG(sWebPLog, LogLevel::Error,
+            ("[this=%p] nsWebPDecoder::CreateFrame -- bad frame rect\n", this));
+    return NS_ERROR_FAILURE;
+  }
+
+  // If this is our first frame in an animation and it doesn't cover the
+  // full frame, then we are transparent even if there is no alpha
+  if (mCurrentFrame == 0 && !aFrameRect.IsEqualEdges(FullFrame())) {
+    MOZ_ASSERT(HasAnimation());
+    mFormat = SurfaceFormat::OS_RGBA;
+    PostHasTransparency();
+  }
+
+  WebPInitDecBuffer(&mBuffer);
+
+  switch (SurfaceFormat::OS_RGBA) {
+    case SurfaceFormat::B8G8R8A8:
+      mBuffer.colorspace = MODE_BGRA;
+      break;
+    case SurfaceFormat::A8R8G8B8:
+      mBuffer.colorspace = MODE_ARGB;
+      break;
+    case SurfaceFormat::R8G8B8A8:
+      mBuffer.colorspace = MODE_RGBA;
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unknown OS_RGBA");
+      return NS_ERROR_FAILURE;
+  }
+
+  mDecoder = WebPINewDecoder(&mBuffer);
+  if (!mDecoder) {
+    MOZ_LOG(sWebPLog, LogLevel::Error,
+            ("[this=%p] nsWebPDecoder::CreateFrame -- create decoder error\n",
+             this));
+    return NS_ERROR_FAILURE;
+  }
+
+  // WebP doesn't guarantee that the alpha generated matches the hint in the
+  // header, so we always need to claim the input is BGRA. If the output is
+  // BGRX, swizzling will mask off the alpha channel.
+  SurfaceFormat inFormat = SurfaceFormat::OS_RGBA;
+
+  SurfacePipeFlags pipeFlags = SurfacePipeFlags();
+  if (mFormat == SurfaceFormat::OS_RGBA &&
+      !(GetSurfaceFlags() & SurfaceFlags::NO_PREMULTIPLY_ALPHA)) {
+    pipeFlags |= SurfacePipeFlags::PREMULTIPLY_ALPHA;
+  }
+
+  Maybe<AnimationParams> animParams;
+  if (!IsFirstFrameDecode()) {
+    animParams.emplace(aFrameRect.ToUnknownRect(), mTimeout, mCurrentFrame,
+                       mBlend, mDisposal);
+  }
+
+  Maybe<SurfacePipe> pipe = SurfacePipeFactory::CreateSurfacePipe(
+      this, Size(), OutputSize(), aFrameRect, inFormat, mFormat, animParams,
+      mTransform, pipeFlags);
+  if (!pipe) {
+    MOZ_LOG(sWebPLog, LogLevel::Error,
+            ("[this=%p] nsWebPDecoder::CreateFrame -- no pipe\n", this));
+    return NS_ERROR_FAILURE;
+  }
+
+  mFrameRect = aFrameRect;
+  mPipe = std::move(*pipe);
+  return NS_OK;
+}
+
+void nsWebPDecoder::EndFrame() {
+  MOZ_ASSERT(HasSize());
+  MOZ_ASSERT(mDecoder);
+
+  auto opacity = mFormat == SurfaceFormat::OS_RGBA ? Opacity::SOME_TRANSPARENCY
+                                                   : Opacity::FULLY_OPAQUE;
+
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::EndFrame -- frame %u, opacity %d, "
+           "disposal %d, timeout %d, blend %d\n",
+           this, mCurrentFrame, (int)opacity, (int)mDisposal,
+           mTimeout.AsEncodedValueDeprecated(), (int)mBlend));
+
+  PostFrameStop(opacity);
+  WebPIDelete(mDecoder);
+  WebPFreeDecBuffer(&mBuffer);
+  mDecoder = nullptr;
+  mLastRow = 0;
+  ++mCurrentFrame;
+}
+
+void nsWebPDecoder::ApplyColorProfile(const char* aProfile, size_t aLength) {
+  MOZ_ASSERT(!mGotColorProfile);
+  mGotColorProfile = true;
+
+  if (mCMSMode == CMSMode::Off || !GetCMSOutputProfile() ||
+      (mCMSMode == CMSMode::TaggedOnly && !aProfile)) {
+    return;
+  }
+
+  if (!aProfile) {
+    MOZ_LOG(sWebPLog, LogLevel::Debug,
+            ("[this=%p] nsWebPDecoder::ApplyColorProfile -- not tagged, use "
+             "sRGB transform\n",
+             this));
+    mTransform = GetCMSsRGBTransform(SurfaceFormat::OS_RGBA);
+    return;
+  }
+
+  mInProfile = qcms_profile_from_memory(aProfile, aLength);
+  if (!mInProfile) {
+    MOZ_LOG(
+        sWebPLog, LogLevel::Error,
+        ("[this=%p] nsWebPDecoder::ApplyColorProfile -- bad color profile\n",
+         this));
+    return;
+  }
+
+  uint32_t profileSpace = qcms_profile_get_color_space(mInProfile);
+  if (profileSpace != icSigRgbData) {
+    // WebP doesn't produce grayscale data, this must be corrupt.
+    MOZ_LOG(sWebPLog, LogLevel::Error,
+            ("[this=%p] nsWebPDecoder::ApplyColorProfile -- ignoring non-rgb "
+             "color profile\n",
+             this));
+    return;
+  }
+
+  // Calculate rendering intent.
+  int intent = gfxPlatform::GetRenderingIntent();
+  if (intent == -1) {
+    intent = qcms_profile_get_rendering_intent(mInProfile);
+  }
+
+  // Create the color management transform.
+  qcms_data_type type = gfxPlatform::GetCMSOSRGBAType();
+  mTransform = qcms_transform_create(mInProfile, type, GetCMSOutputProfile(),
+                                     type, (qcms_intent)intent);
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::ApplyColorProfile -- use tagged "
+           "transform\n",
+           this));
+}
+
+LexerResult nsWebPDecoder::ReadHeader(WebPDemuxer* aDemuxer, bool aIsComplete) {
+  MOZ_ASSERT(aDemuxer);
+
+  MOZ_LOG(
+      sWebPLog, LogLevel::Debug,
+      ("[this=%p] nsWebPDecoder::ReadHeader -- %zu bytes\n", this, mLength));
+
+  uint32_t flags = WebPDemuxGetI(aDemuxer, WEBP_FF_FORMAT_FLAGS);
+
+  if (!IsMetadataDecode() && !mGotColorProfile) {
+    if (flags & WebPFeatureFlags::ICCP_FLAG) {
+      WebPChunkIterator iter;
+      if (WebPDemuxGetChunk(aDemuxer, "ICCP", 1, &iter)) {
+        ApplyColorProfile(reinterpret_cast<const char*>(iter.chunk.bytes),
+                          iter.chunk.size);
+        WebPDemuxReleaseChunkIterator(&iter);
+
+      } else {
+        if (!aIsComplete) {
+          return LexerResult(Yield::NEED_MORE_DATA);
+        }
+
+        MOZ_LOG(sWebPLog, LogLevel::Warning,
+                ("[this=%p] nsWebPDecoder::ReadHeader header specified ICCP "
+                 "but no ICCP chunk found, ignoring\n",
+                 this));
+
+        ApplyColorProfile(nullptr, 0);
+      }
+    } else {
+      ApplyColorProfile(nullptr, 0);
+    }
+  }
+
+  if (flags & WebPFeatureFlags::ANIMATION_FLAG) {
+    // A metadata decode expects to get the correct first frame timeout which
+    // sadly is not provided by the normal WebP header parsing.
+    WebPIterator iter;
+    if (!WebPDemuxGetFrame(aDemuxer, 1, &iter)) {
+      return aIsComplete ? LexerResult(TerminalState::FAILURE)
+                         : LexerResult(Yield::NEED_MORE_DATA);
+    }
+
+    PostIsAnimated(FrameTimeout::FromRawMilliseconds(iter.duration));
+    WebPDemuxReleaseIterator(&iter);
+  } else {
+    // Single frames don't need a demuxer to be created.
+    mNeedDemuxer = false;
+  }
+
+  uint32_t width = WebPDemuxGetI(aDemuxer, WEBP_FF_CANVAS_WIDTH);
+  uint32_t height = WebPDemuxGetI(aDemuxer, WEBP_FF_CANVAS_HEIGHT);
+  if (width > INT32_MAX || height > INT32_MAX) {
+    return LexerResult(TerminalState::FAILURE);
+  }
+
+  PostSize(width, height);
+
+  bool alpha = flags & WebPFeatureFlags::ALPHA_FLAG;
+  if (alpha) {
+    mFormat = SurfaceFormat::OS_RGBA;
+    PostHasTransparency();
+  }
+
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::ReadHeader -- %u x %u, alpha %d, "
+           "animation %d, metadata decode %d, first frame decode %d\n",
+           this, width, height, alpha, HasAnimation(), IsMetadataDecode(),
+           IsFirstFrameDecode()));
+
+  if (IsMetadataDecode()) {
+    return LexerResult(TerminalState::SUCCESS);
+  }
+
+  return ReadPayload(aDemuxer, aIsComplete);
+}
+
+LexerResult nsWebPDecoder::ReadPayload(WebPDemuxer* aDemuxer,
+                                       bool aIsComplete) {
+  if (!HasAnimation()) {
+    auto rv = ReadSingle(mData, mLength, FullFrame());
+    if (rv.is<TerminalState>() &&
+        rv.as<TerminalState>() == TerminalState::SUCCESS) {
+      PostDecodeDone();
+    }
+    return rv;
+  }
+  return ReadMultiple(aDemuxer, aIsComplete);
+}
+
+LexerResult nsWebPDecoder::ReadSingle(const uint8_t* aData, size_t aLength,
+                                      const OrientedIntRect& aFrameRect) {
+  MOZ_ASSERT(!IsMetadataDecode());
+  MOZ_ASSERT(aData);
+  MOZ_ASSERT(aLength > 0);
+
+  MOZ_LOG(
+      sWebPLog, LogLevel::Debug,
+      ("[this=%p] nsWebPDecoder::ReadSingle -- %zu bytes\n", this, aLength));
+
+  if (!mDecoder && NS_FAILED(CreateFrame(aFrameRect))) {
+    return LexerResult(TerminalState::FAILURE);
+  }
+
+  bool complete;
+  do {
+    VP8StatusCode status = WebPIUpdate(mDecoder, aData, aLength);
+    switch (status) {
+      case VP8_STATUS_OK:
+        complete = true;
+        break;
+      case VP8_STATUS_SUSPENDED:
+        complete = false;
+        break;
+      default:
+        MOZ_LOG(sWebPLog, LogLevel::Error,
+                ("[this=%p] nsWebPDecoder::ReadSingle -- append error %d\n",
+                 this, status));
+        return LexerResult(TerminalState::FAILURE);
+    }
+
+    int lastRow = -1;
+    int width = 0;
+    int height = 0;
+    int stride = 0;
+    uint8_t* rowStart =
+        WebPIDecGetRGB(mDecoder, &lastRow, &width, &height, &stride);
+
+    MOZ_LOG(
+        sWebPLog, LogLevel::Debug,
+        ("[this=%p] nsWebPDecoder::ReadSingle -- complete %d, read %d rows, "
+         "has %d rows available\n",
+         this, complete, mLastRow, lastRow));
+
+    if (!rowStart || lastRow == -1 || lastRow == mLastRow) {
+      return LexerResult(Yield::NEED_MORE_DATA);
+    }
+
+    if (width != mFrameRect.width || height != mFrameRect.height ||
+        stride < mFrameRect.width * 4 || lastRow > mFrameRect.height) {
+      MOZ_LOG(sWebPLog, LogLevel::Error,
+              ("[this=%p] nsWebPDecoder::ReadSingle -- bad (w,h,s) = (%d, %d, "
+               "%d)\n",
+               this, width, height, stride));
+      return LexerResult(TerminalState::FAILURE);
+    }
+
+    for (int row = mLastRow; row < lastRow; row++) {
+      uint32_t* src = reinterpret_cast<uint32_t*>(rowStart + row * stride);
+      WriteState result = mPipe.WriteBuffer(src);
+
+      Maybe<SurfaceInvalidRect> invalidRect = mPipe.TakeInvalidRect();
+      if (invalidRect) {
+        PostInvalidation(invalidRect->mInputSpaceRect,
+                         Some(invalidRect->mOutputSpaceRect));
+      }
+
+      if (result == WriteState::FAILURE) {
+        MOZ_LOG(sWebPLog, LogLevel::Error,
+                ("[this=%p] nsWebPDecoder::ReadSingle -- write pixels error\n",
+                 this));
+        return LexerResult(TerminalState::FAILURE);
+      }
+
+      if (result == WriteState::FINISHED) {
+        MOZ_ASSERT(row == lastRow - 1, "There was more data to read?");
+        complete = true;
+        break;
+      }
+    }
+
+    mLastRow = lastRow;
+  } while (!complete);
+
+  if (!complete) {
+    return LexerResult(Yield::NEED_MORE_DATA);
+  }
+
+  EndFrame();
+  return LexerResult(TerminalState::SUCCESS);
+}
+
+LexerResult nsWebPDecoder::ReadMultiple(WebPDemuxer* aDemuxer,
+                                        bool aIsComplete) {
+  MOZ_ASSERT(!IsMetadataDecode());
+  MOZ_ASSERT(aDemuxer);
+
+  MOZ_LOG(sWebPLog, LogLevel::Debug,
+          ("[this=%p] nsWebPDecoder::ReadMultiple\n", this));
+
+  bool complete = aIsComplete;
+  WebPIterator iter;
+  auto rv = LexerResult(Yield::NEED_MORE_DATA);
+  if (WebPDemuxGetFrame(aDemuxer, mCurrentFrame + 1, &iter)) {
+    switch (iter.blend_method) {
+      case WEBP_MUX_BLEND:
+        mBlend = BlendMethod::OVER;
+        break;
+      case WEBP_MUX_NO_BLEND:
+        mBlend = BlendMethod::SOURCE;
+        break;
+      default:
+        MOZ_ASSERT_UNREACHABLE("Unhandled blend method");
+        break;
+    }
+
+    switch (iter.dispose_method) {
+      case WEBP_MUX_DISPOSE_NONE:
+        mDisposal = DisposalMethod::KEEP;
+        break;
+      case WEBP_MUX_DISPOSE_BACKGROUND:
+        mDisposal = DisposalMethod::CLEAR;
+        break;
+      default:
+        MOZ_ASSERT_UNREACHABLE("Unhandled dispose method");
+        break;
+    }
+
+    mFormat = iter.has_alpha || mCurrentFrame > 0 ? SurfaceFormat::OS_RGBA
+                                                  : SurfaceFormat::OS_RGBX;
+    mTimeout = FrameTimeout::FromRawMilliseconds(iter.duration);
+    OrientedIntRect frameRect(iter.x_offset, iter.y_offset, iter.width,
+                              iter.height);
+
+    rv = ReadSingle(iter.fragment.bytes, iter.fragment.size, frameRect);
+    complete = complete && !WebPDemuxNextFrame(&iter);
+    WebPDemuxReleaseIterator(&iter);
+  }
+
+  if (rv.is<TerminalState>() &&
+      rv.as<TerminalState>() == TerminalState::SUCCESS) {
+    // If we extracted one frame, and it is not the last, we need to yield to
+    // the lexer to allow the upper layers to acknowledge the frame.
+    if (!complete && !IsFirstFrameDecode()) {
+      rv = LexerResult(Yield::OUTPUT_AVAILABLE);
+    } else {
+      uint32_t loopCount = WebPDemuxGetI(aDemuxer, WEBP_FF_LOOP_COUNT);
+
+      MOZ_LOG(sWebPLog, LogLevel::Debug,
+              ("[this=%p] nsWebPDecoder::ReadMultiple -- loop count %u\n", this,
+               loopCount));
+      PostDecodeDone(loopCount - 1);
+    }
+  }
+
+  return rv;
+}
+
+Maybe<Telemetry::HistogramID> nsWebPDecoder::SpeedHistogram() const {
+  return Some(Telemetry::IMAGE_DECODE_SPEED_WEBP);
+}
+
+}  // namespace image
+}  // namespace mozilla