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gecko-dev/image/decoders/nsICODecoder.cpp

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/* vim:set tw=80 expandtab softtabstop=2 ts=2 sw=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/. */
/* This is a Cross-Platform ICO Decoder, which should work everywhere, including
* Big-Endian machines like the PowerPC. */
#include "nsICODecoder.h"
#include <stdlib.h>
#include <utility>
#include "RasterImage.h"
#include "mozilla/EndianUtils.h"
#include "mozilla/gfx/Swizzle.h"
using namespace mozilla::gfx;
namespace mozilla {
namespace image {
// Constants.
static const uint32_t ICOHEADERSIZE = 6;
static const uint32_t BITMAPINFOSIZE = bmp::InfoHeaderLength::WIN_ICO;
// ----------------------------------------
// Actual Data Processing
// ----------------------------------------
// Obtains the number of colors from the bits per pixel
uint16_t nsICODecoder::GetNumColors() {
uint16_t numColors = 0;
if (mBPP <= 8) {
switch (mBPP) {
case 1:
numColors = 2;
break;
case 4:
numColors = 16;
break;
case 8:
numColors = 256;
break;
default:
numColors = (uint16_t)-1;
}
}
return numColors;
}
nsICODecoder::nsICODecoder(RasterImage* aImage)
: Decoder(aImage),
mLexer(Transition::To(ICOState::HEADER, ICOHEADERSIZE),
Transition::TerminateSuccess()),
mDirEntry(nullptr),
mNumIcons(0),
mCurrIcon(0),
mBPP(0),
mMaskRowSize(0),
mCurrMaskLine(0),
mIsCursor(false),
mHasMaskAlpha(false) {}
nsresult nsICODecoder::FinishInternal() {
// We shouldn't be called in error cases
MOZ_ASSERT(!HasError(), "Shouldn't call FinishInternal after error!");
return GetFinalStateFromContainedDecoder();
}
nsresult nsICODecoder::FinishWithErrorInternal() {
// No need to assert !mInFrame here because this condition is enforced by
// mContainedDecoder.
return GetFinalStateFromContainedDecoder();
}
nsresult nsICODecoder::GetFinalStateFromContainedDecoder() {
if (!mContainedDecoder) {
return NS_OK;
}
// Let the contained decoder finish up if necessary.
FlushContainedDecoder();
// Make our state the same as the state of the contained decoder.
mDecodeDone = mContainedDecoder->GetDecodeDone();
mProgress |= mContainedDecoder->TakeProgress();
mInvalidRect.UnionRect(mInvalidRect, mContainedDecoder->TakeInvalidRect());
mCurrentFrame = mContainedDecoder->GetCurrentFrameRef();
// Finalize the frame which we deferred to ensure we could modify the final
// result (e.g. to apply the BMP mask).
MOZ_ASSERT(!mContainedDecoder->GetFinalizeFrames());
if (mCurrentFrame) {
mCurrentFrame->FinalizeSurface();
}
// Propagate errors.
nsresult rv =
HasError() || mContainedDecoder->HasError() ? NS_ERROR_FAILURE : NS_OK;
MOZ_ASSERT(NS_FAILED(rv) || !mCurrentFrame || mCurrentFrame->IsFinished());
return rv;
}
LexerTransition<ICOState> nsICODecoder::ReadHeader(const char* aData) {
// If the third byte is 1, this is an icon. If 2, a cursor.
if ((aData[2] != 1) && (aData[2] != 2)) {
return Transition::TerminateFailure();
}
mIsCursor = (aData[2] == 2);
// The fifth and sixth bytes specify the number of resources in the file.
mNumIcons = LittleEndian::readUint16(aData + 4);
if (mNumIcons == 0) {
return Transition::TerminateSuccess(); // Nothing to do.
}
// Downscale-during-decode can end up decoding different resources in the ICO
// file depending on the target size. Since the resources are not necessarily
// scaled versions of the same image, some may be transparent and some may not
// be. We could be precise about transparency if we decoded the metadata of
// every resource, but for now we don't and it's safest to assume that
// transparency could be present.
PostHasTransparency();
return Transition::To(ICOState::DIR_ENTRY, ICODIRENTRYSIZE);
}
size_t nsICODecoder::FirstResourceOffset() const {
MOZ_ASSERT(mNumIcons > 0,
"Calling FirstResourceOffset before processing header");
// The first resource starts right after the directory, which starts right
// after the ICO header.
return ICOHEADERSIZE + mNumIcons * ICODIRENTRYSIZE;
}
LexerTransition<ICOState> nsICODecoder::ReadDirEntry(const char* aData) {
mCurrIcon++;
// Ensure the resource has an offset past the ICO headers.
uint32_t offset = LittleEndian::readUint32(aData + 12);
if (offset >= FirstResourceOffset()) {
// Read the directory entry.
IconDirEntryEx e;
e.mWidth = aData[0];
e.mHeight = aData[1];
e.mColorCount = aData[2];
e.mReserved = aData[3];
e.mPlanes = LittleEndian::readUint16(aData + 4);
e.mBitCount = LittleEndian::readUint16(aData + 6);
e.mBytesInRes = LittleEndian::readUint32(aData + 8);
e.mImageOffset = offset;
e.mSize = IntSize(e.mWidth, e.mHeight);
// Only accept entries with sufficient resource data to actually contain
// some image data.
if (e.mBytesInRes > BITMAPINFOSIZE) {
if (e.mWidth == 0 || e.mHeight == 0) {
mUnsizedDirEntries.AppendElement(e);
} else {
mDirEntries.AppendElement(e);
}
}
}
if (mCurrIcon == mNumIcons) {
if (mUnsizedDirEntries.IsEmpty()) {
return Transition::To(ICOState::FINISHED_DIR_ENTRY, 0);
}
return Transition::To(ICOState::ITERATE_UNSIZED_DIR_ENTRY, 0);
}
return Transition::To(ICOState::DIR_ENTRY, ICODIRENTRYSIZE);
}
LexerTransition<ICOState> nsICODecoder::IterateUnsizedDirEntry() {
MOZ_ASSERT(!mUnsizedDirEntries.IsEmpty());
if (!mDirEntry) {
// The first time we are here, there is no entry selected. We must prepare a
// new iterator for the contained decoder to advance as it wills. Cloning at
// this point ensures it will begin at the end of the dir entries.
mReturnIterator = mLexer.Clone(*mIterator, SIZE_MAX);
if (mReturnIterator.isNothing()) {
// If we cannot read further than this point, then there is no resource
// data to read.
return Transition::TerminateFailure();
}
} else {
// We have already selected an entry which means a metadata decoder has
// finished. Verify the size is valid and if so, add to the discovered
// resources.
if (mDirEntry->mSize.width > 0 && mDirEntry->mSize.height > 0) {
mDirEntries.AppendElement(*mDirEntry);
}
// Remove the entry from the unsized list either way.
mDirEntry = nullptr;
mUnsizedDirEntries.RemoveElementAt(0);
// Our iterator is at an unknown point, so reset it to the point that we
// saved.
mIterator = mLexer.Clone(*mReturnIterator, SIZE_MAX);
if (mIterator.isNothing()) {
MOZ_ASSERT_UNREACHABLE("Cannot re-clone return iterator");
return Transition::TerminateFailure();
}
}
// There are no more unsized entries, so we can finally decide which entry to
// select for decoding.
if (mUnsizedDirEntries.IsEmpty()) {
mReturnIterator.reset();
return Transition::To(ICOState::FINISHED_DIR_ENTRY, 0);
}
// Move to the resource data to start metadata decoding.
mDirEntry = &mUnsizedDirEntries[0];
size_t offsetToResource = mDirEntry->mImageOffset - FirstResourceOffset();
return Transition::ToUnbuffered(ICOState::FOUND_RESOURCE,
ICOState::SKIP_TO_RESOURCE, offsetToResource);
}
LexerTransition<ICOState> nsICODecoder::FinishDirEntry() {
MOZ_ASSERT(!mDirEntry);
if (mDirEntries.IsEmpty()) {
return Transition::TerminateFailure();
}
// If an explicit output size was specified, we'll try to select the resource
// that matches it best below.
const Maybe<IntSize> desiredSize = ExplicitOutputSize();
// Determine the biggest resource. We always use the biggest resource for the
// intrinsic size, and if we don't have a specific desired size, we select it
// as the best resource as well.
int32_t bestDelta = INT32_MIN;
IconDirEntryEx* biggestEntry = nullptr;
for (size_t i = 0; i < mDirEntries.Length(); ++i) {
IconDirEntryEx& e = mDirEntries[i];
mImageMetadata.AddNativeSize(e.mSize);
if (!biggestEntry ||
(e.mBitCount >= biggestEntry->mBitCount &&
e.mSize.width * e.mSize.height >=
biggestEntry->mSize.width * biggestEntry->mSize.height)) {
biggestEntry = &e;
if (!desiredSize) {
mDirEntry = &e;
}
}
if (desiredSize) {
// Calculate the delta between this resource's size and the desired size,
// so we can see if it is better than our current-best option. In the
// case of several equally-good resources, we use the last one. "Better"
// in this case is determined by |delta|, a measure of the difference in
// size between the entry we've found and the desired size. We will choose
// the smallest resource that is greater than or equal to the desired size
// (i.e. we assume it's better to downscale a larger icon than to upscale
// a smaller one).
int32_t delta = std::min(e.mSize.width - desiredSize->width,
e.mSize.height - desiredSize->height);
if (!mDirEntry || (e.mBitCount >= mDirEntry->mBitCount &&
((bestDelta < 0 && delta >= bestDelta) ||
(delta >= 0 && delta <= bestDelta)))) {
mDirEntry = &e;
bestDelta = delta;
}
}
}
MOZ_ASSERT(mDirEntry);
MOZ_ASSERT(biggestEntry);
// If this is a cursor, set the hotspot. We use the hotspot from the biggest
// resource since we also use that resource for the intrinsic size.
if (mIsCursor) {
mImageMetadata.SetHotspot(biggestEntry->mXHotspot, biggestEntry->mYHotspot);
}
// We always report the biggest resource's size as the intrinsic size; this
// is necessary for downscale-during-decode to work since we won't even
// attempt to *upscale* while decoding.
PostSize(biggestEntry->mSize.width, biggestEntry->mSize.height);
if (HasError()) {
return Transition::TerminateFailure();
}
if (IsMetadataDecode()) {
return Transition::TerminateSuccess();
}
if (mDirEntry->mSize == OutputSize()) {
// If the resource we selected matches the output size perfectly, we don't
// need to do any downscaling.
MOZ_ASSERT_IF(desiredSize, mDirEntry->mSize == *desiredSize);
MOZ_ASSERT_IF(!desiredSize, mDirEntry->mSize == Size());
} else if (OutputSize().width < mDirEntry->mSize.width ||
OutputSize().height < mDirEntry->mSize.height) {
// Create a downscaler if we need to downscale.
//
// TODO(aosmond): This is the last user of Downscaler. We should switch this
// to SurfacePipe as well so we can remove the code from tree.
mDownscaler.emplace(OutputSize());
}
size_t offsetToResource = mDirEntry->mImageOffset - FirstResourceOffset();
return Transition::ToUnbuffered(ICOState::FOUND_RESOURCE,
ICOState::SKIP_TO_RESOURCE, offsetToResource);
}
LexerTransition<ICOState> nsICODecoder::SniffResource(const char* aData) {
MOZ_ASSERT(mDirEntry);
// We have BITMAPINFOSIZE bytes buffered at this point. We know an embedded
// BMP will have at least that many bytes by definition. We can also infer
// that any valid embedded PNG will contain that many bytes as well because:
// BITMAPINFOSIZE
// <
// signature (8 bytes) +
// IHDR (12 bytes header + 13 bytes data)
// IDAT (12 bytes header)
// We use the first PNGSIGNATURESIZE bytes to determine whether this resource
// is a PNG or a BMP.
bool isPNG =
!memcmp(aData, nsPNGDecoder::pngSignatureBytes, PNGSIGNATURESIZE);
if (isPNG) {
if (mDirEntry->mBytesInRes <= BITMAPINFOSIZE) {
return Transition::TerminateFailure();
}
// Prepare a new iterator for the contained decoder to advance as it wills.
// Cloning at the point ensures it will begin at the resource offset.
Maybe<SourceBufferIterator> containedIterator =
mLexer.Clone(*mIterator, mDirEntry->mBytesInRes);
if (containedIterator.isNothing()) {
return Transition::TerminateFailure();
}
// Create a PNG decoder which will do the rest of the work for us.
bool metadataDecode = mReturnIterator.isSome();
Maybe<IntSize> expectedSize =
metadataDecode ? Nothing() : Some(mDirEntry->mSize);
mContainedDecoder = DecoderFactory::CreateDecoderForICOResource(
DecoderType::PNG, std::move(containedIterator.ref()), WrapNotNull(this),
metadataDecode, expectedSize);
// Read in the rest of the PNG unbuffered.
size_t toRead = mDirEntry->mBytesInRes - BITMAPINFOSIZE;
return Transition::ToUnbuffered(ICOState::FINISHED_RESOURCE,
ICOState::READ_RESOURCE, toRead);
}
// Make sure we have a sane size for the bitmap information header.
int32_t bihSize = LittleEndian::readUint32(aData);
if (bihSize != static_cast<int32_t>(BITMAPINFOSIZE)) {
return Transition::TerminateFailure();
}
// Read in the rest of the bitmap information header.
return ReadBIH(aData);
}
LexerTransition<ICOState> nsICODecoder::ReadResource() {
if (!FlushContainedDecoder()) {
return Transition::TerminateFailure();
}
return Transition::ContinueUnbuffered(ICOState::READ_RESOURCE);
}
LexerTransition<ICOState> nsICODecoder::ReadBIH(const char* aData) {
MOZ_ASSERT(mDirEntry);
// Extract the BPP from the BIH header; it should be trusted over the one
// we have from the ICO header which is usually set to 0.
mBPP = LittleEndian::readUint16(aData + 14);
// Check to make sure we have valid color settings.
uint16_t numColors = GetNumColors();
if (numColors == uint16_t(-1)) {
return Transition::TerminateFailure();
}
// The color table is present only if BPP is <= 8.
MOZ_ASSERT_IF(mBPP > 8, numColors == 0);
// The ICO format when containing a BMP does not include the 14 byte
// bitmap file header. So we create the BMP decoder via the constructor that
// tells it to skip this, and pass in the required data (dataOffset) that
// would have been present in the header.
uint32_t dataOffset =
bmp::FILE_HEADER_LENGTH + BITMAPINFOSIZE + 4 * numColors;
// Prepare a new iterator for the contained decoder to advance as it wills.
// Cloning at the point ensures it will begin at the resource offset.
Maybe<SourceBufferIterator> containedIterator =
mLexer.Clone(*mIterator, mDirEntry->mBytesInRes);
if (containedIterator.isNothing()) {
return Transition::TerminateFailure();
}
// Create a BMP decoder which will do most of the work for us; the exception
// is the AND mask, which isn't present in standalone BMPs.
bool metadataDecode = mReturnIterator.isSome();
Maybe<IntSize> expectedSize =
metadataDecode ? Nothing() : Some(mDirEntry->mSize);
mContainedDecoder = DecoderFactory::CreateDecoderForICOResource(
DecoderType::BMP, std::move(containedIterator.ref()), WrapNotNull(this),
metadataDecode, expectedSize, Some(dataOffset));
RefPtr<nsBMPDecoder> bmpDecoder =
static_cast<nsBMPDecoder*>(mContainedDecoder.get());
// Ensure the decoder has parsed at least the BMP's bitmap info header.
if (!FlushContainedDecoder()) {
return Transition::TerminateFailure();
}
// If this is a metadata decode, FinishResource will any necessary checks.
if (mContainedDecoder->IsMetadataDecode()) {
return Transition::To(ICOState::FINISHED_RESOURCE, 0);
}
// Do we have an AND mask on this BMP? If so, we need to read it after we read
// the BMP data itself.
uint32_t bmpDataLength = bmpDecoder->GetCompressedImageSize() + 4 * numColors;
bool hasANDMask = (BITMAPINFOSIZE + bmpDataLength) < mDirEntry->mBytesInRes;
ICOState afterBMPState =
hasANDMask ? ICOState::PREPARE_FOR_MASK : ICOState::FINISHED_RESOURCE;
// Read in the rest of the BMP unbuffered.
return Transition::ToUnbuffered(afterBMPState, ICOState::READ_RESOURCE,
bmpDataLength);
}
LexerTransition<ICOState> nsICODecoder::PrepareForMask() {
MOZ_ASSERT(mDirEntry);
MOZ_ASSERT(mContainedDecoder->GetDecodeDone());
// We have received all of the data required by the BMP decoder so flushing
// here guarantees the decode has finished.
if (!FlushContainedDecoder()) {
return Transition::TerminateFailure();
}
MOZ_ASSERT(mContainedDecoder->GetDecodeDone());
RefPtr<nsBMPDecoder> bmpDecoder =
static_cast<nsBMPDecoder*>(mContainedDecoder.get());
uint16_t numColors = GetNumColors();
MOZ_ASSERT(numColors != uint16_t(-1));
// Determine the length of the AND mask.
uint32_t bmpLengthWithHeader =
BITMAPINFOSIZE + bmpDecoder->GetCompressedImageSize() + 4 * numColors;
MOZ_ASSERT(bmpLengthWithHeader < mDirEntry->mBytesInRes);
uint32_t maskLength = mDirEntry->mBytesInRes - bmpLengthWithHeader;
// If the BMP provides its own transparency, we ignore the AND mask.
if (bmpDecoder->HasTransparency()) {
return Transition::ToUnbuffered(ICOState::FINISHED_RESOURCE,
ICOState::SKIP_MASK, maskLength);
}
// Compute the row size for the mask.
mMaskRowSize = ((mDirEntry->mSize.width + 31) / 32) * 4; // + 31 to round up
// If the expected size of the AND mask is larger than its actual size, then
// we must have a truncated (and therefore corrupt) AND mask.
uint32_t expectedLength = mMaskRowSize * mDirEntry->mSize.height;
if (maskLength < expectedLength) {
return Transition::TerminateFailure();
}
// If we're downscaling, the mask is the wrong size for the surface we've
// produced, so we need to downscale the mask into a temporary buffer and then
// combine the mask's alpha values with the color values from the image.
if (mDownscaler) {
MOZ_ASSERT(bmpDecoder->GetImageDataLength() ==
mDownscaler->TargetSize().width *
mDownscaler->TargetSize().height * sizeof(uint32_t));
mMaskBuffer = MakeUnique<uint8_t[]>(bmpDecoder->GetImageDataLength());
nsresult rv =
mDownscaler->BeginFrame(mDirEntry->mSize, Nothing(), mMaskBuffer.get(),
/* aHasAlpha = */ true,
/* aFlipVertically = */ true);
if (NS_FAILED(rv)) {
return Transition::TerminateFailure();
}
}
mCurrMaskLine = mDirEntry->mSize.height;
return Transition::To(ICOState::READ_MASK_ROW, mMaskRowSize);
}
LexerTransition<ICOState> nsICODecoder::ReadMaskRow(const char* aData) {
MOZ_ASSERT(mDirEntry);
mCurrMaskLine--;
uint8_t sawTransparency = 0;
// Get the mask row we're reading.
const uint8_t* mask = reinterpret_cast<const uint8_t*>(aData);
const uint8_t* maskRowEnd = mask + mMaskRowSize;
// Get the corresponding row of the mask buffer (if we're downscaling) or the
// decoded image data (if we're not).
uint32_t* decoded = nullptr;
if (mDownscaler) {
// Initialize the row to all white and fully opaque.
memset(mDownscaler->RowBuffer(), 0xFF,
mDirEntry->mSize.width * sizeof(uint32_t));
decoded = reinterpret_cast<uint32_t*>(mDownscaler->RowBuffer());
} else {
RefPtr<nsBMPDecoder> bmpDecoder =
static_cast<nsBMPDecoder*>(mContainedDecoder.get());
uint32_t* imageData = bmpDecoder->GetImageData();
if (!imageData) {
return Transition::TerminateFailure();
}
decoded = imageData + mCurrMaskLine * mDirEntry->mSize.width;
}
MOZ_ASSERT(decoded);
uint32_t* decodedRowEnd = decoded + mDirEntry->mSize.width;
// Iterate simultaneously through the AND mask and the image data.
while (mask < maskRowEnd) {
uint8_t idx = *mask++;
sawTransparency |= idx;
for (uint8_t bit = 0x80; bit && decoded < decodedRowEnd; bit >>= 1) {
// Clear pixel completely for transparency.
if (idx & bit) {
*decoded = 0;
}
decoded++;
}
}
if (mDownscaler) {
mDownscaler->CommitRow();
}
// If any bits are set in sawTransparency, then we know at least one pixel was
// transparent.
if (sawTransparency) {
mHasMaskAlpha = true;
}
if (mCurrMaskLine == 0) {
return Transition::To(ICOState::FINISH_MASK, 0);
}
return Transition::To(ICOState::READ_MASK_ROW, mMaskRowSize);
}
LexerTransition<ICOState> nsICODecoder::FinishMask() {
// If we're downscaling, we now have the appropriate alpha values in
// mMaskBuffer. We just need to transfer them to the image.
if (mDownscaler) {
// Retrieve the image data.
RefPtr<nsBMPDecoder> bmpDecoder =
static_cast<nsBMPDecoder*>(mContainedDecoder.get());
uint8_t* imageData = reinterpret_cast<uint8_t*>(bmpDecoder->GetImageData());
if (!imageData) {
return Transition::TerminateFailure();
}
// Iterate through the alpha values, copying from mask to image.
MOZ_ASSERT(mMaskBuffer);
MOZ_ASSERT(bmpDecoder->GetImageDataLength() > 0);
for (size_t i = 3; i < bmpDecoder->GetImageDataLength(); i += 4) {
imageData[i] = mMaskBuffer[i];
}
int32_t stride = mDownscaler->TargetSize().width * sizeof(uint32_t);
DebugOnly<bool> ret =
// We know the format is OS_RGBA because we always assume bmp's inside
// ico's are transparent.
PremultiplyData(imageData, stride, SurfaceFormat::OS_RGBA, imageData,
stride, SurfaceFormat::OS_RGBA,
mDownscaler->TargetSize());
MOZ_ASSERT(ret);
}
return Transition::To(ICOState::FINISHED_RESOURCE, 0);
}
LexerTransition<ICOState> nsICODecoder::FinishResource() {
MOZ_ASSERT(mDirEntry);
// We have received all of the data required by the PNG/BMP decoder so
// flushing here guarantees the decode has finished.
if (!FlushContainedDecoder()) {
return Transition::TerminateFailure();
}
MOZ_ASSERT(mContainedDecoder->GetDecodeDone());
// If it is a metadata decode, all we were trying to get was the size
// information missing from the dir entry.
if (mContainedDecoder->IsMetadataDecode()) {
if (mContainedDecoder->HasSize()) {
mDirEntry->mSize = mContainedDecoder->Size();
}
return Transition::To(ICOState::ITERATE_UNSIZED_DIR_ENTRY, 0);
}
// Raymond Chen says that 32bpp only are valid PNG ICOs
// http://blogs.msdn.com/b/oldnewthing/archive/2010/10/22/10079192.aspx
if (!mContainedDecoder->IsValidICOResource()) {
return Transition::TerminateFailure();
}
// This size from the resource should match that from the dir entry.
MOZ_ASSERT_IF(mContainedDecoder->HasSize(),
mContainedDecoder->Size() == mDirEntry->mSize);
return Transition::TerminateSuccess();
}
LexerResult nsICODecoder::DoDecode(SourceBufferIterator& aIterator,
IResumable* aOnResume) {
MOZ_ASSERT(!HasError(), "Shouldn't call DoDecode after error!");
return mLexer.Lex(
aIterator, aOnResume,
[=](ICOState aState, const char* aData, size_t aLength) {
switch (aState) {
case ICOState::HEADER:
return ReadHeader(aData);
case ICOState::DIR_ENTRY:
return ReadDirEntry(aData);
case ICOState::FINISHED_DIR_ENTRY:
return FinishDirEntry();
case ICOState::ITERATE_UNSIZED_DIR_ENTRY:
return IterateUnsizedDirEntry();
case ICOState::SKIP_TO_RESOURCE:
return Transition::ContinueUnbuffered(ICOState::SKIP_TO_RESOURCE);
case ICOState::FOUND_RESOURCE:
return Transition::To(ICOState::SNIFF_RESOURCE, BITMAPINFOSIZE);
case ICOState::SNIFF_RESOURCE:
return SniffResource(aData);
case ICOState::READ_RESOURCE:
return ReadResource();
case ICOState::PREPARE_FOR_MASK:
return PrepareForMask();
case ICOState::READ_MASK_ROW:
return ReadMaskRow(aData);
case ICOState::FINISH_MASK:
return FinishMask();
case ICOState::SKIP_MASK:
return Transition::ContinueUnbuffered(ICOState::SKIP_MASK);
case ICOState::FINISHED_RESOURCE:
return FinishResource();
default:
MOZ_CRASH("Unknown ICOState");
}
});
}
bool nsICODecoder::FlushContainedDecoder() {
MOZ_ASSERT(mContainedDecoder);
bool succeeded = true;
// If we run out of data, the ICO decoder will get resumed when there's more
// data available, as usual, so we don't need the contained decoder to get
// resumed too. To avoid that, we provide an IResumable which just does
// nothing. All the caller needs to do is flush when there is new data.
LexerResult result = mContainedDecoder->Decode();
if (result == LexerResult(TerminalState::FAILURE)) {
succeeded = false;
}
MOZ_ASSERT(result != LexerResult(Yield::OUTPUT_AVAILABLE),
"Unexpected yield");
// Make our state the same as the state of the contained decoder, and
// propagate errors.
mProgress |= mContainedDecoder->TakeProgress();
mInvalidRect.UnionRect(mInvalidRect, mContainedDecoder->TakeInvalidRect());
if (mContainedDecoder->HasError()) {
succeeded = false;
}
return succeeded;
}
} // namespace image
} // namespace mozilla
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