зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
3.0 KiB
C++
99 строки
3.0 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 "SurfacePipe.h"
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#include <algorithm> // for min
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#include "Decoder.h"
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namespace mozilla {
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namespace image {
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using namespace gfx;
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using std::min;
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Maybe<SurfaceInvalidRect> AbstractSurfaceSink::TakeInvalidRect() {
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if (mInvalidRect.IsEmpty()) {
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return Nothing();
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}
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SurfaceInvalidRect invalidRect;
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invalidRect.mInputSpaceRect = invalidRect.mOutputSpaceRect = mInvalidRect;
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// Forget about the invalid rect we're returning.
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mInvalidRect = IntRect();
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return Some(invalidRect);
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}
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uint8_t* AbstractSurfaceSink::DoResetToFirstRow() {
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mRow = 0;
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return GetRowPointer();
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}
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uint8_t* AbstractSurfaceSink::DoAdvanceRow() {
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if (mRow >= uint32_t(InputSize().height)) {
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return nullptr;
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}
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// If we're vertically flipping the output, we need to flip the invalid rect.
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// Since we're dealing with an axis-aligned rect, only the y coordinate needs
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// to change.
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int32_t invalidY = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
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mInvalidRect.UnionRect(mInvalidRect,
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IntRect(0, invalidY, InputSize().width, 1));
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mRow = min(uint32_t(InputSize().height), mRow + 1);
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return mRow < uint32_t(InputSize().height) ? GetRowPointer() : nullptr;
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}
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nsresult SurfaceSink::Configure(const SurfaceConfig& aConfig) {
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IntSize surfaceSize = aConfig.mOutputSize;
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// Allocate the frame.
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// XXX(seth): Once every Decoder subclass uses SurfacePipe, we probably want
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// to allocate the frame directly here and get rid of Decoder::AllocateFrame
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// altogether.
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nsresult rv = aConfig.mDecoder->AllocateFrame(surfaceSize, aConfig.mFormat,
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aConfig.mAnimParams);
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if (NS_FAILED(rv)) {
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return rv;
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}
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mImageData = aConfig.mDecoder->mImageData;
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mImageDataLength = aConfig.mDecoder->mImageDataLength;
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mFlipVertically = aConfig.mFlipVertically;
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MOZ_ASSERT(mImageData);
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MOZ_ASSERT(uint64_t(mImageDataLength) == uint64_t(surfaceSize.width) *
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uint64_t(surfaceSize.height) *
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sizeof(uint32_t));
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ConfigureFilter(surfaceSize, sizeof(uint32_t));
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return NS_OK;
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}
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uint8_t* SurfaceSink::GetRowPointer() const {
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// If we're flipping vertically, reverse the order in which we traverse the
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// rows.
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uint32_t row = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
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uint8_t* rowPtr = mImageData + row * InputSize().width * sizeof(uint32_t);
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MOZ_ASSERT(rowPtr >= mImageData);
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MOZ_ASSERT(rowPtr < mImageData + mImageDataLength);
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MOZ_ASSERT(rowPtr + InputSize().width * sizeof(uint32_t) <=
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mImageData + mImageDataLength);
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return rowPtr;
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}
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} // namespace image
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} // namespace mozilla
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