129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 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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#include "nsIconDecoder.h"
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#include "RasterImage.h"
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#include "SurfacePipeFactory.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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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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Transition::TerminateSuccess())
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, mBytesPerRow() // set by ReadHeader()
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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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LexerResult
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nsIconDecoder::DoDecode(SourceBufferIterator& aIterator, IResumable* aOnResume)
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{
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MOZ_ASSERT(!HasError(), "Shouldn't call DoDecode after error!");
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return mLexer.Lex(aIterator, aOnResume,
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[=](State aState, 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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}
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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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uint8_t width = uint8_t(aData[0]);
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uint8_t height = 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 = width * 4;
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// Post our size to the superclass.
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PostSize(width, height);
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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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Maybe<SurfacePipe> pipe =
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SurfacePipeFactory::CreateSurfacePipe(this, Size(), OutputSize(),
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FullFrame(), SurfaceFormat::B8G8R8A8,
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/* aAnimParams */ Nothing(),
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SurfacePipeFlags());
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if (!pipe) {
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return Transition::TerminateFailure();
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}
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mPipe = Move(*pipe);
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MOZ_ASSERT(mImageData, "Should have a buffer now");
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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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MOZ_ASSERT(aLength % 4 == 0, "Rows should contain a multiple of four bytes");
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auto result = mPipe.WritePixels<uint32_t>([&]() -> NextPixel<uint32_t> {
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if (aLength == 0) {
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return AsVariant(WriteState::NEED_MORE_DATA); // Done with this row.
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}
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uint32_t pixel;
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memcpy(&pixel, aData, 4);
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aData += 4;
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aLength -= 4;
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return AsVariant(pixel);
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});
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MOZ_ASSERT(result != WriteState::FAILURE);
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Maybe<SurfaceInvalidRect> invalidRect = mPipe.TakeInvalidRect();
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if (invalidRect) {
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PostInvalidation(invalidRect->mInputSpaceRect,
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Some(invalidRect->mOutputSpaceRect));
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}
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return result == WriteState::FINISHED
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? Transition::To(State::FINISH, 0)
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: Transition::To(State::ROW_OF_PIXELS, mBytesPerRow);
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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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