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authorwolfbeast <mcwerewolf@gmail.com>2017-07-24 13:29:29 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-02-03 10:03:50 +0100
commit3e0351aa49be56434df121d9b4d9f283c422a670 (patch)
tree66e587490ddf75684fa3657486e99b56a8db8626 /image
parentb094b135956829a293dd409eefa39f2912434fd9 (diff)
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Implement WebP image decoder.
Diffstat (limited to 'image')
-rw-r--r--image/DecoderFactory.cpp14
-rw-r--r--image/DecoderFactory.h1
-rw-r--r--image/build/nsImageModule.cpp1
-rw-r--r--image/decoders/moz.build1
-rw-r--r--image/decoders/nsWebPDecoder.cpp467
-rw-r--r--image/decoders/nsWebPDecoder.h91
6 files changed, 573 insertions, 2 deletions
diff --git a/image/DecoderFactory.cpp b/image/DecoderFactory.cpp
index 1c51d2fbc..2085fb7c4 100644
--- a/image/DecoderFactory.cpp
+++ b/image/DecoderFactory.cpp
@@ -5,6 +5,7 @@
#include "DecoderFactory.h"
+#include "gfxPrefs.h"
#include "nsMimeTypes.h"
#include "mozilla/RefPtr.h"
@@ -17,6 +18,7 @@
#include "nsBMPDecoder.h"
#include "nsICODecoder.h"
#include "nsIconDecoder.h"
+#include "nsWebPDecoder.h"
namespace mozilla {
@@ -65,8 +67,12 @@ DecoderFactory::GetDecoderType(const char* aMimeType)
// Icon
} else if (!strcmp(aMimeType, IMAGE_ICON_MS)) {
type = DecoderType::ICON;
- }
+ // WebP
+ } else if (!strcmp(aMimeType, IMAGE_WEBP) &&
+ gfxPrefs::ImageWebPEnabled()) {
+ type = DecoderType::WEBP;
+ }
return type;
}
@@ -100,6 +106,9 @@ DecoderFactory::GetDecoder(DecoderType aType,
case DecoderType::ICON:
decoder = new nsIconDecoder(aImage);
break;
+ case DecoderType::WEBP:
+ decoder = new nsWebPDecoder(aImage);
+ break;
default:
MOZ_ASSERT_UNREACHABLE("Unknown decoder type");
}
@@ -171,7 +180,8 @@ DecoderFactory::CreateAnimationDecoder(DecoderType aType,
return nullptr;
}
- MOZ_ASSERT(aType == DecoderType::GIF || aType == DecoderType::PNG,
+ MOZ_ASSERT(aType == DecoderType::GIF || aType == DecoderType::PNG ||
+ aType == DecoderType::WEBP,
"Calling CreateAnimationDecoder for non-animating DecoderType");
// Create an anonymous decoder. Interaction with the SurfaceCache and the
diff --git a/image/DecoderFactory.h b/image/DecoderFactory.h
index 107ebede6..f8cf64cc6 100644
--- a/image/DecoderFactory.h
+++ b/image/DecoderFactory.h
@@ -36,6 +36,7 @@ enum class DecoderType
BMP,
ICO,
ICON,
+ WEBP,
UNKNOWN
};
diff --git a/image/build/nsImageModule.cpp b/image/build/nsImageModule.cpp
index 48d246cd3..9d52c07b6 100644
--- a/image/build/nsImageModule.cpp
+++ b/image/build/nsImageModule.cpp
@@ -82,6 +82,7 @@ static const mozilla::Module::CategoryEntry kImageCategories[] = {
{ "Gecko-Content-Viewers", IMAGE_PNG, "@mozilla.org/content/document-loader-factory;1" },
{ "Gecko-Content-Viewers", IMAGE_APNG, "@mozilla.org/content/document-loader-factory;1" },
{ "Gecko-Content-Viewers", IMAGE_X_PNG, "@mozilla.org/content/document-loader-factory;1" },
+ { "Gecko-Content-Viewers", IMAGE_WEBP, "@mozilla.org/content/document-loader-factory;1" },
{ "content-sniffing-services", "@mozilla.org/image/loader;1", "@mozilla.org/image/loader;1" },
{ nullptr }
};
diff --git a/image/decoders/moz.build b/image/decoders/moz.build
index 775c3eaa5..30c026f99 100644
--- a/image/decoders/moz.build
+++ b/image/decoders/moz.build
@@ -28,6 +28,7 @@ UNIFIED_SOURCES += [
'nsIconDecoder.cpp',
'nsJPEGDecoder.cpp',
'nsPNGDecoder.cpp',
+ 'nsWebPDecoder.cpp',
]
include('/ipc/chromium/chromium-config.mozbuild')
diff --git a/image/decoders/nsWebPDecoder.cpp b/image/decoders/nsWebPDecoder.cpp
new file mode 100644
index 000000000..5da696347
--- /dev/null
+++ b/image/decoders/nsWebPDecoder.cpp
@@ -0,0 +1,467 @@
+/* -*- 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 "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)
+ , mLexer(Transition::ToUnbuffered(State::FINISHED_WEBP_DATA,
+ State::WEBP_DATA,
+ SIZE_MAX),
+ Transition::TerminateSuccess())
+ , mDecoder(nullptr)
+ , mBlend(BlendMethod::OVER)
+ , mDisposal(DisposalMethod::KEEP)
+ , mTimeout(FrameTimeout::Forever())
+ , mFormat(SurfaceFormat::B8G8R8X8)
+ , mLastRow(0)
+ , mCurrentFrame(0)
+{
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::nsWebPDecoder", this));
+}
+
+nsWebPDecoder::~nsWebPDecoder()
+{
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::~nsWebPDecoder", this));
+ WebPIDelete(mDecoder);
+}
+
+LexerResult
+nsWebPDecoder::DoDecode(SourceBufferIterator& aIterator, IResumable* aOnResume)
+{
+ MOZ_ASSERT(!HasError(), "Shouldn't call DoDecode after error!");
+
+ return mLexer.Lex(aIterator, aOnResume,
+ [=](State aState, const char* aData, size_t aLength) {
+ switch (aState) {
+ case State::WEBP_DATA:
+ if (!HasSize()) {
+ return ReadHeader(aData, aLength);
+ }
+ return ReadPayload(aData, aLength);
+ case State::FINISHED_WEBP_DATA:
+ return FinishedData();
+ }
+ MOZ_CRASH("Unknown State");
+ });
+}
+
+nsresult
+nsWebPDecoder::CreateFrame(const nsIntRect& aFrameRect)
+{
+ MOZ_ASSERT(HasSize());
+ MOZ_ASSERT(!mDecoder);
+
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::CreateFrame -- frame %u, %d x %d\n",
+ this, mCurrentFrame, aFrameRect.width, aFrameRect.height));
+
+ // 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());
+ PostHasTransparency();
+ }
+
+ WebPInitDecBuffer(&mBuffer);
+ mBuffer.colorspace = MODE_RGBA;
+
+ mDecoder = WebPINewDecoder(&mBuffer);
+ if (!mDecoder) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::CreateFrame -- create decoder error\n",
+ this));
+ return NS_ERROR_FAILURE;
+ }
+
+ Maybe<SurfacePipe> pipe = SurfacePipeFactory::CreateSurfacePipe(this,
+ mCurrentFrame, Size(), OutputSize(), aFrameRect,
+ mFormat, SurfacePipeFlags());
+ if (!pipe) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::CreateFrame -- no pipe\n", this));
+ return NS_ERROR_FAILURE;
+ }
+
+ mPipe = Move(*pipe);
+ return NS_OK;
+}
+
+void
+nsWebPDecoder::EndFrame()
+{
+ MOZ_ASSERT(HasSize());
+ MOZ_ASSERT(mDecoder);
+
+ auto opacity = mFormat == SurfaceFormat::B8G8R8A8
+ ? 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, mDisposal, mTimeout, mBlend);
+ WebPIDelete(mDecoder);
+ mDecoder = nullptr;
+ mLastRow = 0;
+ ++mCurrentFrame;
+}
+
+nsresult
+nsWebPDecoder::GetDataBuffer(const uint8_t*& aData, size_t& aLength)
+{
+ if (!mData.empty() && mData.begin() != aData) {
+ if (!mData.append(aData, aLength)) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::GetDataBuffer -- oom, append %zu on %zu\n",
+ this, aLength, mData.length()));
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ aData = mData.begin();
+ aLength = mData.length();
+ }
+ return NS_OK;
+}
+
+nsresult
+nsWebPDecoder::SaveDataBuffer(const uint8_t* aData, size_t aLength)
+{
+ if (mData.empty() && !mData.append(aData, aLength)) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::SaveDataBuffer -- oom, append %zu on %zu\n",
+ this, aLength, mData.length()));
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ return NS_OK;
+}
+
+LexerTransition<nsWebPDecoder::State>
+nsWebPDecoder::ReadHeader(const char* aData, size_t aLength)
+{
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::ReadHeader -- %zu bytes\n", this, aLength));
+
+ // XXX(aosmond): In an ideal world, we could request the lexer to do this
+ // buffering for us (and in turn the underlying SourceBuffer). That way we
+ // could avoid extra copies during the decode and just do
+ // SourceBuffer::Compact on each iteration. For a typical WebP image we
+ // can hope that we will get the full header in the first packet, but
+ // for animated images we will end up buffering the whole stream if it
+ // not already fully received and contiguous.
+ auto data = (const uint8_t*)aData;
+ size_t length = aLength;
+ if (NS_FAILED(GetDataBuffer(data, length))) {
+ return Transition::TerminateFailure();
+ }
+
+ WebPBitstreamFeatures features;
+ VP8StatusCode status = WebPGetFeatures(data, length, &features);
+ switch (status) {
+ case VP8_STATUS_OK:
+ break;
+ case VP8_STATUS_NOT_ENOUGH_DATA:
+ if (NS_FAILED(SaveDataBuffer(data, length))) {
+ return Transition::TerminateFailure();
+ }
+ return Transition::ContinueUnbuffered(State::WEBP_DATA);
+ default:
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadHeader -- parse error %d\n",
+ this, status));
+ return Transition::TerminateFailure();
+ }
+
+ if (features.has_animation) {
+ // A metadata decode expects to get the correct first frame timeout which
+ // sadly is not provided by the normal WebP header parsing.
+ WebPDemuxState state;
+ WebPData fragment;
+ fragment.bytes = data;
+ fragment.size = length;
+ WebPDemuxer* demuxer = WebPDemuxPartial(&fragment, &state);
+ if (!demuxer || state == WEBP_DEMUX_PARSE_ERROR) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadHeader -- demux parse error\n", this));
+ WebPDemuxDelete(demuxer);
+ return Transition::TerminateFailure();
+ }
+
+ WebPIterator iter;
+ if (!WebPDemuxGetFrame(demuxer, 1, &iter)) {
+ WebPDemuxDelete(demuxer);
+ if (state == WEBP_DEMUX_DONE) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadHeader -- demux parse error\n",
+ this));
+ return Transition::TerminateFailure();
+ }
+ if (NS_FAILED(SaveDataBuffer(data, length))) {
+ return Transition::TerminateFailure();
+ }
+ return Transition::ContinueUnbuffered(State::WEBP_DATA);
+ }
+
+ PostIsAnimated(FrameTimeout::FromRawMilliseconds(iter.duration));
+ WebPDemuxReleaseIterator(&iter);
+ WebPDemuxDelete(demuxer);
+ }
+
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::ReadHeader -- %d x %d, alpha %d, "
+ "animation %d, format %d, metadata decode %d, first frame decode %d\n",
+ this, features.width, features.height, features.has_alpha,
+ features.has_animation, features.format, IsMetadataDecode(),
+ IsFirstFrameDecode()));
+
+ PostSize(features.width, features.height);
+ if (features.has_alpha) {
+ mFormat = SurfaceFormat::B8G8R8A8;
+ PostHasTransparency();
+ }
+
+ if (IsMetadataDecode()) {
+ return Transition::TerminateSuccess();
+ }
+
+ auto transition = ReadPayload((const char*)data, length);
+ if (!features.has_animation) {
+ mData.clearAndFree();
+ }
+ return transition;
+}
+
+LexerTransition<nsWebPDecoder::State>
+nsWebPDecoder::ReadPayload(const char* aData, size_t aLength)
+{
+ auto data = (const uint8_t*)aData;
+ if (!HasAnimation()) {
+ auto rv = ReadSingle(data, aLength, true, FullFrame());
+ if (rv.NextStateIsTerminal() &&
+ rv.NextStateAsTerminal() == TerminalState::SUCCESS) {
+ PostDecodeDone();
+ }
+ return rv;
+ }
+ return ReadMultiple(data, aLength);
+}
+
+LexerTransition<nsWebPDecoder::State>
+nsWebPDecoder::ReadSingle(const uint8_t* aData, size_t aLength, bool aAppend, const IntRect& 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 Transition::TerminateFailure();
+ }
+
+ // XXX(aosmond): The demux API can be used for single images according to the
+ // documentation. If WebPIAppend is not any more efficient in its buffering
+ // than what we do for animated images, we should just combine the use cases.
+ bool complete;
+ VP8StatusCode status;
+ if (aAppend) {
+ status = WebPIAppend(mDecoder, aData, aLength);
+ } else {
+ 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 Transition::TerminateFailure();
+ }
+
+ int lastRow = -1;
+ int width = 0;
+ int height = 0;
+ int stride = 0;
+ const uint8_t* rowStart = WebPIDecGetRGB(mDecoder, &lastRow, &width, &height, &stride);
+ if (!rowStart || lastRow == -1) {
+ return Transition::ContinueUnbuffered(State::WEBP_DATA);
+ }
+
+ if (width <= 0 || height <= 0 || stride <= 0) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadSingle -- bad (w,h,s) = (%d, %d, %d)\n",
+ this, width, height, stride));
+ return Transition::TerminateFailure();
+ }
+
+ for (int row = mLastRow; row < lastRow; row++) {
+ const uint8_t* src = rowStart + row * stride;
+ auto result = mPipe.WritePixelsToRow<uint32_t>([&]() -> NextPixel<uint32_t> {
+ MOZ_ASSERT(mFormat == SurfaceFormat::B8G8R8A8 || src[3] == 0xFF);
+ const uint32_t pixel = gfxPackedPixel(src[3], src[0], src[1], src[2]);
+ src += 4;
+ return AsVariant(pixel);
+ });
+ MOZ_ASSERT(result != WriteState::FAILURE);
+ MOZ_ASSERT_IF(result == WriteState::FINISHED, complete && row == lastRow - 1);
+
+ if (result == WriteState::FAILURE) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadSingle -- write pixels error\n",
+ this));
+ return Transition::TerminateFailure();
+ }
+ }
+
+ if (mLastRow != lastRow) {
+ mLastRow = lastRow;
+
+ Maybe<SurfaceInvalidRect> invalidRect = mPipe.TakeInvalidRect();
+ if (invalidRect) {
+ PostInvalidation(invalidRect->mInputSpaceRect,
+ Some(invalidRect->mOutputSpaceRect));
+ }
+ }
+
+ if (!complete) {
+ return Transition::ContinueUnbuffered(State::WEBP_DATA);
+ }
+
+ EndFrame();
+ return Transition::TerminateSuccess();
+}
+
+LexerTransition<nsWebPDecoder::State>
+nsWebPDecoder::ReadMultiple(const uint8_t* aData, size_t aLength)
+{
+ MOZ_ASSERT(!IsMetadataDecode());
+ MOZ_ASSERT(aData);
+
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::ReadMultiple -- %zu bytes\n", this, aLength));
+
+ auto data = aData;
+ size_t length = aLength;
+ if (NS_FAILED(GetDataBuffer(data, length))) {
+ return Transition::TerminateFailure();
+ }
+
+ WebPDemuxState state;
+ WebPData fragment;
+ fragment.bytes = data;
+ fragment.size = length;
+ WebPDemuxer* demuxer = WebPDemuxPartial(&fragment, &state);
+ if (!demuxer) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadMultiple -- create demuxer error\n",
+ this));
+ return Transition::TerminateFailure();
+ }
+
+ if (state == WEBP_DEMUX_PARSE_ERROR) {
+ MOZ_LOG(sWebPLog, LogLevel::Error,
+ ("[this=%p] nsWebPDecoder::ReadMultiple -- demuxer parse error\n",
+ this));
+ WebPDemuxDelete(demuxer);
+ return Transition::TerminateFailure();
+ }
+
+ bool complete = false;
+ WebPIterator iter;
+ auto rv = Transition::ContinueUnbuffered(State::WEBP_DATA);
+ if (WebPDemuxGetFrame(demuxer, 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 ? SurfaceFormat::B8G8R8A8 : SurfaceFormat::B8G8R8X8;
+ mTimeout = FrameTimeout::FromRawMilliseconds(iter.duration);
+ nsIntRect frameRect(iter.x_offset, iter.y_offset, iter.width, iter.height);
+
+ rv = ReadSingle(iter.fragment.bytes, iter.fragment.size, false, frameRect);
+ complete = state == WEBP_DEMUX_DONE && !WebPDemuxNextFrame(&iter);
+ WebPDemuxReleaseIterator(&iter);
+ }
+
+ if (rv.NextStateIsTerminal()) {
+ if (rv.NextStateAsTerminal() == 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()) {
+ // The resume point is determined by whether or not we had to buffer.
+ // If we have yet to buffer, we want to resume at the same point,
+ // otherwise our internal buffer has everything we need and we want
+ // to resume having consumed all of the current fragment.
+ rv = Transition::ContinueUnbufferedAfterYield(State::WEBP_DATA,
+ mData.empty() ? 0 : aLength);
+ } else {
+ uint32_t loopCount = WebPDemuxGetI(demuxer, WEBP_FF_LOOP_COUNT);
+
+ MOZ_LOG(sWebPLog, LogLevel::Debug,
+ ("[this=%p] nsWebPDecoder::ReadMultiple -- loop count %u\n",
+ this, loopCount));
+ PostDecodeDone(loopCount - 1);
+ }
+ }
+ } else if (NS_FAILED(SaveDataBuffer(data, length))) {
+ rv = Transition::TerminateFailure();
+ }
+
+ WebPDemuxDelete(demuxer);
+ return rv;
+}
+
+LexerTransition<nsWebPDecoder::State>
+nsWebPDecoder::FinishedData()
+{
+ // Since we set up an unbuffered read for SIZE_MAX bytes, if we actually read
+ // all that data something is really wrong.
+ MOZ_ASSERT_UNREACHABLE("Read the entire address space?");
+ return Transition::TerminateFailure();
+}
+
+} // namespace image
+} // namespace mozilla
diff --git a/image/decoders/nsWebPDecoder.h b/image/decoders/nsWebPDecoder.h
new file mode 100644
index 000000000..5b3951cfc
--- /dev/null
+++ b/image/decoders/nsWebPDecoder.h
@@ -0,0 +1,91 @@
+/* -*- 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/. */
+
+#ifndef mozilla_image_decoders_nsWebPDecoder_h
+#define mozilla_image_decoders_nsWebPDecoder_h
+
+#include "Decoder.h"
+#include "webp/demux.h"
+#include "StreamingLexer.h"
+#include "SurfacePipe.h"
+
+namespace mozilla {
+namespace image {
+class RasterImage;
+
+class nsWebPDecoder : public Decoder
+{
+public:
+ virtual ~nsWebPDecoder();
+
+protected:
+ LexerResult DoDecode(SourceBufferIterator& aIterator,
+ IResumable* aOnResume) override;
+
+private:
+ friend class DecoderFactory;
+
+ // Decoders should only be instantiated via DecoderFactory.
+ explicit nsWebPDecoder(RasterImage* aImage);
+
+ enum class State
+ {
+ WEBP_DATA,
+ FINISHED_WEBP_DATA
+ };
+
+ LexerTransition<State> ReadHeader(const char* aData, size_t aLength);
+ LexerTransition<State> ReadPayload(const char* aData, size_t aLength);
+ LexerTransition<State> FinishedData();
+
+ nsresult CreateFrame(const nsIntRect& aFrameRect);
+ void EndFrame();
+
+ nsresult GetDataBuffer(const uint8_t*& aData, size_t& aLength);
+ nsresult SaveDataBuffer(const uint8_t* aData, size_t aLength);
+
+ LexerTransition<State> ReadSingle(const uint8_t* aData, size_t aLength,
+ bool aAppend, const IntRect& aFrameRect);
+
+ LexerTransition<State> ReadMultiple(const uint8_t* aData, size_t aLength);
+
+ StreamingLexer<State> mLexer;
+
+ /// The SurfacePipe used to write to the output surface.
+ SurfacePipe mPipe;
+
+ /// The buffer used to accumulate data until the complete WebP header is received.
+ Vector<uint8_t> mData;
+
+ /// The libwebp output buffer descriptor pointing to the decoded data.
+ WebPDecBuffer mBuffer;
+
+ /// The libwebp incremental decoder descriptor, wraps mBuffer.
+ WebPIDecoder* mDecoder;
+
+ /// Blend method for the current frame.
+ BlendMethod mBlend;
+
+ /// Disposal method for the current frame.
+ DisposalMethod mDisposal;
+
+ /// Frame timeout for the current frame;
+ FrameTimeout mTimeout;
+
+ /// Surface format for the current frame.
+ gfx::SurfaceFormat mFormat;
+
+ /// The last row of decoded pixels written to mPipe.
+ int mLastRow;
+
+ /// Number of decoded frames.
+ uint32_t mCurrentFrame;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_decoders_nsWebPDecoder_h