mirror of
https://github.com/classilla/tenfourfox.git
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655 lines
22 KiB
C++
655 lines
22 KiB
C++
/* vim:set tw=80 expandtab softtabstop=2 ts=2 sw=2: */
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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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/* This is a Cross-Platform ICO Decoder, which should work everywhere, including
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* Big-Endian machines like the PowerPC. */
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#include <stdlib.h>
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#include "mozilla/Endian.h"
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#include "mozilla/Move.h"
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#include "nsICODecoder.h"
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#include "RasterImage.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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namespace image {
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// Constants.
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static const uint32_t ICOHEADERSIZE = 6;
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static const uint32_t BITMAPINFOSIZE = bmp::InfoHeaderLength::WIN_ICO;
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// ----------------------------------------
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// Actual Data Processing
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// ----------------------------------------
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// Obtains the number of colors from the bits per pixel
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uint16_t
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nsICODecoder::GetNumColors()
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{
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uint16_t numColors = 0;
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if (mBPP <= 8) {
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switch (mBPP) {
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case 1:
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numColors = 2;
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break;
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case 4:
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numColors = 16;
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break;
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case 8:
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numColors = 256;
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break;
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default:
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numColors = (uint16_t)-1;
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}
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}
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return numColors;
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}
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nsICODecoder::nsICODecoder(RasterImage* aImage)
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: Decoder(aImage)
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, mLexer(Transition::To(ICOState::HEADER, ICOHEADERSIZE))
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, mBiggestResourceColorDepth(0)
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, mBestResourceDelta(INT_MIN)
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, mBestResourceColorDepth(0)
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, mNumIcons(0)
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, mCurrIcon(0)
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, mBPP(0)
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, mMaskRowSize(0)
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, mCurrMaskLine(0)
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, mIsCursor(false)
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, mHasMaskAlpha(false)
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{ }
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void
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nsICODecoder::FinishInternal()
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{
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// We shouldn't be called in error cases
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MOZ_ASSERT(!HasError(), "Shouldn't call FinishInternal after error!");
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GetFinalStateFromContainedDecoder();
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}
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void
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nsICODecoder::FinishWithErrorInternal()
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{
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GetFinalStateFromContainedDecoder();
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}
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void
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nsICODecoder::GetFinalStateFromContainedDecoder()
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{
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if (!mContainedDecoder) {
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return;
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}
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// Finish the internally used decoder.
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mContainedDecoder->CompleteDecode();
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mDecodeDone = mContainedDecoder->GetDecodeDone();
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mDataError = mDataError || mContainedDecoder->HasDataError();
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mFailCode = NS_SUCCEEDED(mFailCode) ? mContainedDecoder->GetDecoderError()
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: mFailCode;
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mDecodeAborted = mContainedDecoder->WasAborted();
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mProgress |= mContainedDecoder->TakeProgress();
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mInvalidRect.UnionRect(mInvalidRect, mContainedDecoder->TakeInvalidRect());
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mCurrentFrame = mContainedDecoder->GetCurrentFrameRef();
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MOZ_ASSERT(HasError() || !mCurrentFrame || mCurrentFrame->IsImageComplete());
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}
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bool
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nsICODecoder::CheckAndFixBitmapSize(int8_t* aBIH)
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{
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// Get the width from the BMP file information header. This is
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// (unintuitively) a signed integer; see the documentation at:
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//
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// https://msdn.microsoft.com/en-us/library/windows/desktop/dd183376(v=vs.85).aspx
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//
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// However, we reject negative widths since they aren't meaningful.
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const int32_t width = LittleEndian::readInt32(aBIH + 4);
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if (width <= 0 || width > 256) {
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return false;
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}
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// Verify that the BMP width matches the width we got from the ICO directory
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// entry. If not, decoding fails, because if we were to allow it to continue
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// the intrinsic size of the image wouldn't match the size of the decoded
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// surface.
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if (width != int32_t(GetRealWidth())) {
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return false;
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}
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// Get the height from the BMP file information header. This is also signed,
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// but in this case negative values are meaningful; see below.
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int32_t height = LittleEndian::readInt32(aBIH + 8);
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if (height == 0) {
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return false;
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}
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// BMPs can be stored inverted by having a negative height.
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// XXX(seth): Should we really be writing the absolute value into the BIH
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// below? Seems like this could be problematic for inverted BMPs.
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height = abs(height);
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// The height field is double the actual height of the image to account for
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// the AND mask. This is true even if the AND mask is not present.
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height /= 2;
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if (height > 256) {
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return false;
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}
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// Verify that the BMP height matches the height we got from the ICO directory
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// entry. If not, again, decoding fails.
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if (height != int32_t(GetRealHeight())) {
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return false;
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}
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// Fix the BMP height in the BIH so that the BMP decoder, which does not know
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// about the AND mask that may follow the actual bitmap, can work properly.
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LittleEndian::writeInt32(aBIH + 8, GetRealHeight());
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return true;
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}
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LexerTransition<ICOState>
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nsICODecoder::ReadHeader(const char* aData)
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{
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// If the third byte is 1, this is an icon. If 2, a cursor.
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if ((aData[2] != 1) && (aData[2] != 2)) {
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return Transition::TerminateFailure();
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}
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mIsCursor = (aData[2] == 2);
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// The fifth and sixth bytes specify the number of resources in the file.
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mNumIcons = LittleEndian::readUint16(aData + 4);
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if (mNumIcons == 0) {
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return Transition::TerminateSuccess(); // Nothing to do.
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}
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// Downscale-during-decode can end up decoding different resources in the ICO
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// file depending on the target size. Since the resources are not necessarily
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// scaled versions of the same image, some may be transparent and some may not
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// be. We could be precise about transparency if we decoded the metadata of
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// every resource, but for now we don't and it's safest to assume that
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// transparency could be present.
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PostHasTransparency();
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return Transition::To(ICOState::DIR_ENTRY, ICODIRENTRYSIZE);
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}
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size_t
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nsICODecoder::FirstResourceOffset() const
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{
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MOZ_ASSERT(mNumIcons > 0,
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"Calling FirstResourceOffset before processing header");
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// The first resource starts right after the directory, which starts right
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// after the ICO header.
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return ICOHEADERSIZE + mNumIcons * ICODIRENTRYSIZE;
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}
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LexerTransition<ICOState>
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nsICODecoder::ReadDirEntry(const char* aData)
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{
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mCurrIcon++;
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// Read the directory entry.
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IconDirEntry e;
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e.mWidth = aData[0];
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e.mHeight = aData[1];
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e.mColorCount = aData[2];
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e.mReserved = aData[3];
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e.mPlanes = LittleEndian::readUint16(aData + 4);
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e.mBitCount = LittleEndian::readUint16(aData + 6);
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e.mBytesInRes = LittleEndian::readUint32(aData + 8);
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e.mImageOffset = LittleEndian::readUint32(aData + 12);
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// Determine if this is the biggest resource we've seen so far. We always use
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// the biggest resource for the intrinsic size, and if we're not downscaling,
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// we select it as the best resource as well.
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IntSize entrySize(GetRealWidth(e), GetRealHeight(e));
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if (e.mBitCount >= mBiggestResourceColorDepth &&
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entrySize.width * entrySize.height >=
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mBiggestResourceSize.width * mBiggestResourceSize.height) {
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mBiggestResourceSize = entrySize;
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mBiggestResourceColorDepth = e.mBitCount;
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mBiggestResourceHotSpot = IntSize(e.mXHotspot, e.mYHotspot);
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if (!mDownscaler) {
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mDirEntry = e;
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}
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}
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if (mDownscaler) {
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// Calculate the delta between this resource's size and the desired size, so
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// we can see if it is better than our current-best option. In the case of
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// several equally-good resources, we use the last one. "Better" in this
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// case is determined by |delta|, a measure of the difference in size
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// between the entry we've found and the downscaler's target size. We will
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// choose the smallest resource that is >= the target size (i.e. we assume
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// it's better to downscale a larger icon than to upscale a smaller one).
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IntSize desiredSize = mDownscaler->TargetSize();
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int32_t delta = std::min(entrySize.width - desiredSize.width,
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entrySize.height - desiredSize.height);
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if (e.mBitCount >= mBestResourceColorDepth &&
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((mBestResourceDelta < 0 && delta >= mBestResourceDelta) ||
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(delta >= 0 && delta <= mBestResourceDelta))) {
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mBestResourceDelta = delta;
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mBestResourceColorDepth = e.mBitCount;
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mDirEntry = e;
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}
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}
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if (mCurrIcon == mNumIcons) {
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// Ensure the resource we selected has an offset past the ICO headers.
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if (mDirEntry.mImageOffset < FirstResourceOffset()) {
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return Transition::TerminateFailure();
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}
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// If this is a cursor, set the hotspot. We use the hotspot from the biggest
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// resource since we also use that resource for the intrinsic size.
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if (mIsCursor) {
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mImageMetadata.SetHotspot(mBiggestResourceHotSpot.width,
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mBiggestResourceHotSpot.height);
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}
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// We always report the biggest resource's size as the intrinsic size; this
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// is necessary for downscale-during-decode to work since we won't even
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// attempt to *upscale* while decoding.
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PostSize(mBiggestResourceSize.width, mBiggestResourceSize.height);
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if (IsMetadataDecode()) {
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return Transition::TerminateSuccess();
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}
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// If the resource we selected matches the downscaler's target size
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// perfectly, we don't need to do any downscaling.
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if (mDownscaler && GetRealSize() == mDownscaler->TargetSize()) {
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mDownscaler.reset();
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}
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size_t offsetToResource = mDirEntry.mImageOffset - FirstResourceOffset();
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return Transition::ToUnbuffered(ICOState::FOUND_RESOURCE,
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ICOState::SKIP_TO_RESOURCE,
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offsetToResource);
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}
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return Transition::To(ICOState::DIR_ENTRY, ICODIRENTRYSIZE);
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}
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LexerTransition<ICOState>
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nsICODecoder::SniffResource(const char* aData)
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{
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// We use the first PNGSIGNATURESIZE bytes to determine whether this resource
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// is a PNG or a BMP.
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bool isPNG = !memcmp(aData, nsPNGDecoder::pngSignatureBytes,
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PNGSIGNATURESIZE);
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if (isPNG) {
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// Create a PNG decoder which will do the rest of the work for us.
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mContainedDecoder = new nsPNGDecoder(mImage);
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mContainedDecoder->SetMetadataDecode(IsMetadataDecode());
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mContainedDecoder->SetDecoderFlags(GetDecoderFlags());
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mContainedDecoder->SetSurfaceFlags(GetSurfaceFlags());
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if (mDownscaler) {
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mContainedDecoder->SetTargetSize(mDownscaler->TargetSize());
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}
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mContainedDecoder->Init();
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if (!WriteToContainedDecoder(aData, PNGSIGNATURESIZE)) {
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return Transition::TerminateFailure();
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}
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if (mDirEntry.mBytesInRes <= PNGSIGNATURESIZE) {
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return Transition::TerminateFailure();
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}
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// Read in the rest of the PNG unbuffered.
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size_t toRead = mDirEntry.mBytesInRes - PNGSIGNATURESIZE;
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return Transition::ToUnbuffered(ICOState::FINISHED_RESOURCE,
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ICOState::READ_PNG,
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toRead);
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} else {
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// Make sure we have a sane size for the bitmap information header.
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int32_t bihSize = LittleEndian::readUint32(aData);
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if (bihSize != static_cast<int32_t>(BITMAPINFOSIZE)) {
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return Transition::TerminateFailure();
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}
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// Buffer the first part of the bitmap information header.
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memcpy(mBIHraw, aData, PNGSIGNATURESIZE);
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// Read in the rest of the bitmap information header.
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return Transition::To(ICOState::READ_BIH,
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BITMAPINFOSIZE - PNGSIGNATURESIZE);
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}
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}
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LexerTransition<ICOState>
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nsICODecoder::ReadPNG(const char* aData, uint32_t aLen)
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{
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if (!WriteToContainedDecoder(aData, aLen)) {
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return Transition::TerminateFailure();
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}
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// Raymond Chen says that 32bpp only are valid PNG ICOs
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// http://blogs.msdn.com/b/oldnewthing/archive/2010/10/22/10079192.aspx
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if (!static_cast<nsPNGDecoder*>(mContainedDecoder.get())->IsValidICO()) {
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return Transition::TerminateFailure();
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}
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return Transition::ContinueUnbuffered(ICOState::READ_PNG);
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}
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LexerTransition<ICOState>
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nsICODecoder::ReadBIH(const char* aData)
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{
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// Buffer the rest of the bitmap information header.
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memcpy(mBIHraw + PNGSIGNATURESIZE, aData, BITMAPINFOSIZE - PNGSIGNATURESIZE);
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// Extract the BPP from the BIH header; it should be trusted over the one
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// we have from the ICO header which is usually set to 0.
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mBPP = LittleEndian::readUint16(mBIHraw + 14);
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// The ICO format when containing a BMP does not include the 14 byte
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// bitmap file header. So we create the BMP decoder via the constructor that
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// tells it to skip this, and pass in the required data (dataOffset) that
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// would have been present in the header.
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uint32_t dataOffset = bmp::FILE_HEADER_LENGTH + BITMAPINFOSIZE;
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if (mDirEntry.mBitCount <= 8) {
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// The color table is present only if BPP is <= 8.
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uint16_t numColors = GetNumColors();
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if (numColors == (uint16_t)-1) {
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return Transition::TerminateFailure();
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}
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dataOffset += 4 * numColors;
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}
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// Create a BMP decoder which will do most of the work for us; the exception
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// is the AND mask, which isn't present in standalone BMPs.
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RefPtr<nsBMPDecoder> bmpDecoder = new nsBMPDecoder(mImage, dataOffset);
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mContainedDecoder = bmpDecoder;
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mContainedDecoder->SetMetadataDecode(IsMetadataDecode());
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mContainedDecoder->SetDecoderFlags(GetDecoderFlags());
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mContainedDecoder->SetSurfaceFlags(GetSurfaceFlags());
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if (mDownscaler) {
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mContainedDecoder->SetTargetSize(mDownscaler->TargetSize());
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}
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mContainedDecoder->Init();
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// Verify that the BIH width and height values match the ICO directory entry,
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// and fix the BIH height value to compensate for the fact that the underlying
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// BMP decoder doesn't know about AND masks.
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if (!CheckAndFixBitmapSize(reinterpret_cast<int8_t*>(mBIHraw))) {
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return Transition::TerminateFailure();
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}
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// Write out the BMP's bitmap info header.
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if (!WriteToContainedDecoder(mBIHraw, sizeof(mBIHraw))) {
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return Transition::TerminateFailure();
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}
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// Check to make sure we have valid color settings.
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uint16_t numColors = GetNumColors();
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if (numColors == uint16_t(-1)) {
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return Transition::TerminateFailure();
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}
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// Do we have an AND mask on this BMP? If so, we need to read it after we read
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// the BMP data itself.
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uint32_t bmpDataLength = bmpDecoder->GetCompressedImageSize() + 4 * numColors;
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bool hasANDMask = (BITMAPINFOSIZE + bmpDataLength) < mDirEntry.mBytesInRes;
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ICOState afterBMPState = hasANDMask ? ICOState::PREPARE_FOR_MASK
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: ICOState::FINISHED_RESOURCE;
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// Read in the rest of the BMP unbuffered.
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return Transition::ToUnbuffered(afterBMPState,
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ICOState::READ_BMP,
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bmpDataLength);
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}
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LexerTransition<ICOState>
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nsICODecoder::ReadBMP(const char* aData, uint32_t aLen)
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{
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if (!WriteToContainedDecoder(aData, aLen)) {
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return Transition::TerminateFailure();
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}
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return Transition::ContinueUnbuffered(ICOState::READ_BMP);
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}
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LexerTransition<ICOState>
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nsICODecoder::PrepareForMask()
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{
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RefPtr<nsBMPDecoder> bmpDecoder =
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static_cast<nsBMPDecoder*>(mContainedDecoder.get());
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uint16_t numColors = GetNumColors();
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MOZ_ASSERT(numColors != uint16_t(-1));
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// Determine the length of the AND mask.
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uint32_t bmpLengthWithHeader =
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BITMAPINFOSIZE + bmpDecoder->GetCompressedImageSize() + 4 * numColors;
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MOZ_ASSERT(bmpLengthWithHeader < mDirEntry.mBytesInRes);
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uint32_t maskLength = mDirEntry.mBytesInRes - bmpLengthWithHeader;
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// If the BMP provides its own transparency, we ignore the AND mask. We can
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// also obviously ignore it if the image has zero width or zero height.
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if (bmpDecoder->HasTransparency() ||
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GetRealWidth() == 0 || GetRealHeight() == 0) {
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return Transition::ToUnbuffered(ICOState::FINISHED_RESOURCE,
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ICOState::SKIP_MASK,
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maskLength);
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}
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// Compute the row size for the mask.
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mMaskRowSize = ((GetRealWidth() + 31) / 32) * 4; // + 31 to round up
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// If the expected size of the AND mask is larger than its actual size, then
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// we must have a truncated (and therefore corrupt) AND mask.
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uint32_t expectedLength = mMaskRowSize * GetRealHeight();
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if (maskLength < expectedLength) {
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return Transition::TerminateFailure();
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}
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// If we're downscaling, the mask is the wrong size for the surface we've
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// produced, so we need to downscale the mask into a temporary buffer and then
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// combine the mask's alpha values with the color values from the image.
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if (mDownscaler) {
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MOZ_ASSERT(bmpDecoder->GetImageDataLength() ==
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mDownscaler->TargetSize().width *
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mDownscaler->TargetSize().height *
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sizeof(uint32_t));
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mMaskBuffer = MakeUnique<uint8_t[]>(bmpDecoder->GetImageDataLength());
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nsresult rv = mDownscaler->BeginFrame(GetRealSize(), Nothing(),
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mMaskBuffer.get(),
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/* aHasAlpha = */ true,
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/* aFlipVertically = */ true);
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if (NS_FAILED(rv)) {
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return Transition::TerminateFailure();
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}
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}
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mCurrMaskLine = GetRealHeight();
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return Transition::To(ICOState::READ_MASK_ROW, mMaskRowSize);
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}
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LexerTransition<ICOState>
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nsICODecoder::ReadMaskRow(const char* aData)
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{
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mCurrMaskLine--;
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uint8_t sawTransparency = 0;
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// Get the mask row we're reading.
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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, GetRealWidth() * 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 * GetRealWidth();
|
|
}
|
|
|
|
MOZ_ASSERT(decoded);
|
|
uint32_t* decodedRowEnd = decoded + GetRealWidth();
|
|
|
|
// 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];
|
|
}
|
|
}
|
|
|
|
// If the mask contained any transparent pixels, record that fact.
|
|
if (mHasMaskAlpha) {
|
|
PostHasTransparency();
|
|
|
|
RefPtr<nsBMPDecoder> bmpDecoder =
|
|
static_cast<nsBMPDecoder*>(mContainedDecoder.get());
|
|
bmpDecoder->SetHasTransparency();
|
|
}
|
|
|
|
return Transition::To(ICOState::FINISHED_RESOURCE, 0);
|
|
}
|
|
|
|
LexerTransition<ICOState>
|
|
nsICODecoder::FinishResource()
|
|
{
|
|
// Make sure the actual size of the resource matches the size in the directory
|
|
// entry. If not, we consider the image corrupt.
|
|
if (mContainedDecoder->HasSize() &&
|
|
mContainedDecoder->GetSize() != GetRealSize()) {
|
|
return Transition::TerminateFailure();
|
|
}
|
|
|
|
return Transition::TerminateSuccess();
|
|
}
|
|
|
|
void
|
|
nsICODecoder::WriteInternal(const char* aBuffer, uint32_t aCount)
|
|
{
|
|
MOZ_ASSERT(!HasError(), "Shouldn't call WriteInternal after error!");
|
|
MOZ_ASSERT(aBuffer);
|
|
MOZ_ASSERT(aCount > 0);
|
|
|
|
Maybe<TerminalState> terminalState =
|
|
mLexer.Lex(aBuffer, aCount,
|
|
[=](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::SKIP_TO_RESOURCE:
|
|
return Transition::ContinueUnbuffered(ICOState::SKIP_TO_RESOURCE);
|
|
case ICOState::FOUND_RESOURCE:
|
|
return Transition::To(ICOState::SNIFF_RESOURCE, PNGSIGNATURESIZE);
|
|
case ICOState::SNIFF_RESOURCE:
|
|
return SniffResource(aData);
|
|
case ICOState::READ_PNG:
|
|
return ReadPNG(aData, aLength);
|
|
case ICOState::READ_BIH:
|
|
return ReadBIH(aData);
|
|
case ICOState::READ_BMP:
|
|
return ReadBMP(aData, aLength);
|
|
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");
|
|
}
|
|
});
|
|
|
|
if (terminalState == Some(TerminalState::FAILURE)) {
|
|
PostDataError();
|
|
}
|
|
}
|
|
|
|
bool
|
|
nsICODecoder::WriteToContainedDecoder(const char* aBuffer, uint32_t aCount)
|
|
{
|
|
mContainedDecoder->Write(aBuffer, aCount);
|
|
mProgress |= mContainedDecoder->TakeProgress();
|
|
mInvalidRect.UnionRect(mInvalidRect, mContainedDecoder->TakeInvalidRect());
|
|
if (mContainedDecoder->HasDataError()) {
|
|
PostDataError();
|
|
}
|
|
if (mContainedDecoder->HasDecoderError()) {
|
|
PostDecoderError(mContainedDecoder->GetDecoderError());
|
|
}
|
|
return !HasError();
|
|
}
|
|
|
|
} // namespace image
|
|
} // namespace mozilla
|