142 lines
3.8 KiB
C++
142 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsIconDecoder.h"
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#include "nsIInputStream.h"
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#include "nspr.h"
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#include "nsRect.h"
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#include "nsError.h"
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#include "RasterImage.h"
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#include <algorithm>
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using namespace mozilla::gfx;
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using std::min;
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namespace mozilla {
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namespace image {
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static const uint32_t ICON_HEADER_SIZE = 2;
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nsIconDecoder::nsIconDecoder(RasterImage* aImage)
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: Decoder(aImage)
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, mLexer(Transition::To(State::HEADER, ICON_HEADER_SIZE))
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, mWidth() // set by ReadHeader()
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, mHeight() // set by ReadHeader()
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, mBytesPerRow() // set by ReadHeader()
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, mCurrentRow(0)
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{
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// Nothing to do
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}
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nsIconDecoder::~nsIconDecoder()
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{ }
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void
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nsIconDecoder::WriteInternal(const char* aBuffer, uint32_t aCount)
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{
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MOZ_ASSERT(!HasError(), "Shouldn't call WriteInternal after error!");
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MOZ_ASSERT(aBuffer);
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MOZ_ASSERT(aCount > 0);
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Maybe<TerminalState> terminalState =
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mLexer.Lex(aBuffer, aCount, [=](State aState,
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const char* aData, size_t aLength) {
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switch (aState) {
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case State::HEADER:
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return ReadHeader(aData);
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case State::ROW_OF_PIXELS:
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return ReadRowOfPixels(aData, aLength);
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case State::FINISH:
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return Finish();
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default:
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MOZ_CRASH("Unknown State");
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}
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});
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if (terminalState == Some(TerminalState::FAILURE)) {
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PostDataError();
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}
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}
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LexerTransition<nsIconDecoder::State>
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nsIconDecoder::ReadHeader(const char* aData)
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{
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// Grab the width and height.
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mWidth = uint8_t(aData[0]);
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mHeight = uint8_t(aData[1]);
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// The input is 32bpp, so we expect 4 bytes of data per pixel.
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mBytesPerRow = mWidth * 4;
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// Post our size to the superclass.
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PostSize(mWidth, mHeight);
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// Icons have alpha.
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PostHasTransparency();
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// If we're doing a metadata decode, we're done.
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if (IsMetadataDecode()) {
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return Transition::TerminateSuccess();
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}
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MOZ_ASSERT(!mImageData, "Already have a buffer allocated?");
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IntSize targetSize = mDownscaler ? mDownscaler->TargetSize() : GetSize();
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nsresult rv = AllocateFrame(0, targetSize,
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IntRect(IntPoint(), targetSize),
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gfx::SurfaceFormat::B8G8R8A8);
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if (NS_FAILED(rv)) {
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return Transition::TerminateFailure();
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}
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MOZ_ASSERT(mImageData, "Should have a buffer now");
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if (mDownscaler) {
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nsresult rv = mDownscaler->BeginFrame(GetSize(), Nothing(),
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mImageData, /* aHasAlpha = */ 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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return Transition::To(State::ROW_OF_PIXELS, mBytesPerRow);
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}
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LexerTransition<nsIconDecoder::State>
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nsIconDecoder::ReadRowOfPixels(const char* aData, size_t aLength)
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{
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if (mDownscaler) {
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memcpy(mDownscaler->RowBuffer(), aData, mBytesPerRow);
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mDownscaler->CommitRow();
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if (mDownscaler->HasInvalidation()) {
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DownscalerInvalidRect invalidRect = mDownscaler->TakeInvalidRect();
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PostInvalidation(invalidRect.mOriginalSizeRect,
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Some(invalidRect.mTargetSizeRect));
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}
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} else {
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memcpy(mImageData + mCurrentRow * mBytesPerRow, aData, mBytesPerRow);
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PostInvalidation(IntRect(0, mCurrentRow, mWidth, 1));
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}
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mCurrentRow++;
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return (mCurrentRow < mHeight)
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? Transition::To(State::ROW_OF_PIXELS, mBytesPerRow)
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: Transition::To(State::FINISH, 0);
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}
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LexerTransition<nsIconDecoder::State>
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nsIconDecoder::Finish()
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{
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PostFrameStop();
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PostDecodeDone();
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return Transition::TerminateSuccess();
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}
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} // namespace image
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} // namespace mozilla
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