169 lines
6.5 KiB
C++
169 lines
6.5 KiB
C++
/*
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* Copyright (C) 2020-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "ImageBufferBackend.h"
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#include "Image.h"
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#include "PixelBuffer.h"
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#include "PixelBufferConversion.h"
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namespace WebCore {
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IntSize ImageBufferBackend::calculateBackendSize(const Parameters& parameters)
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{
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FloatSize scaledSize = { ceilf(parameters.resolutionScale * parameters.logicalSize.width()), ceilf(parameters.resolutionScale * parameters.logicalSize.height()) };
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if (scaledSize.isEmpty() || !scaledSize.isExpressibleAsIntSize())
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return { };
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return IntSize(scaledSize);
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}
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size_t ImageBufferBackend::calculateMemoryCost(const IntSize& backendSize, unsigned bytesPerRow)
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{
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ASSERT(!backendSize.isEmpty());
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return CheckedUint32(backendSize.height()) * bytesPerRow;
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}
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ImageBufferBackend::ImageBufferBackend(const Parameters& parameters)
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: m_parameters(parameters)
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{
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}
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ImageBufferBackend::~ImageBufferBackend() = default;
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RefPtr<NativeImage> ImageBufferBackend::sinkIntoNativeImage()
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{
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return copyNativeImage(DontCopyBackingStore);
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}
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RefPtr<Image> ImageBufferBackend::sinkIntoImage(PreserveResolution preserveResolution)
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{
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return copyImage(DontCopyBackingStore, preserveResolution);
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}
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void ImageBufferBackend::drawConsuming(GraphicsContext& destinationContext, const FloatRect& destinationRect, const FloatRect& sourceRect, const ImagePaintingOptions& options)
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{
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draw(destinationContext, destinationRect, sourceRect, options);
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}
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void ImageBufferBackend::convertToLuminanceMask()
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{
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PixelBufferFormat format { AlphaPremultiplication::Unpremultiplied, PixelFormat::RGBA8, colorSpace() };
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auto pixelBuffer = getPixelBuffer(format, logicalRect());
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if (!pixelBuffer)
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return;
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auto& pixelArray = pixelBuffer->data();
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unsigned pixelArrayLength = pixelArray.length();
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for (unsigned pixelOffset = 0; pixelOffset < pixelArrayLength; pixelOffset += 4) {
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uint8_t a = pixelArray.item(pixelOffset + 3);
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if (!a)
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continue;
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uint8_t r = pixelArray.item(pixelOffset);
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uint8_t g = pixelArray.item(pixelOffset + 1);
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uint8_t b = pixelArray.item(pixelOffset + 2);
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double luma = (r * 0.2125 + g * 0.7154 + b * 0.0721) * ((double)a / 255.0);
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pixelArray.set(pixelOffset + 3, luma);
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}
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putPixelBuffer(*pixelBuffer, logicalRect(), IntPoint::zero(), AlphaPremultiplication::Premultiplied);
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}
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std::optional<PixelBuffer> ImageBufferBackend::getPixelBuffer(const PixelBufferFormat& destinationFormat, const IntRect& sourceRect, void* data) const
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{
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ASSERT(PixelBuffer::supportedPixelFormat(destinationFormat.pixelFormat));
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auto sourceRectScaled = toBackendCoordinates(sourceRect);
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auto pixelBuffer = PixelBuffer::tryCreate(destinationFormat, sourceRectScaled.size());
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if (!pixelBuffer)
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return std::nullopt;
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auto sourceRectClipped = intersection(backendRect(), sourceRectScaled);
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IntRect destinationRect { IntPoint::zero(), sourceRectClipped.size() };
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if (sourceRectScaled.x() < 0)
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destinationRect.setX(-sourceRectScaled.x());
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if (sourceRectScaled.y() < 0)
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destinationRect.setY(-sourceRectScaled.y());
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if (destinationRect.size() != sourceRectScaled.size())
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pixelBuffer->data().zeroFill();
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ConstPixelBufferConversionView source {
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{ AlphaPremultiplication::Premultiplied, pixelFormat(), colorSpace() },
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bytesPerRow(),
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static_cast<uint8_t*>(data) + sourceRectClipped.y() * source.bytesPerRow + sourceRectClipped.x() * 4
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};
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PixelBufferConversionView destination {
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destinationFormat,
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static_cast<unsigned>(4 * sourceRectScaled.width()),
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pixelBuffer->data().data() + destinationRect.y() * destination.bytesPerRow + destinationRect.x() * 4
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};
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convertImagePixels(source, destination, destinationRect.size());
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return pixelBuffer;
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}
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void ImageBufferBackend::putPixelBuffer(const PixelBuffer& sourcePixelBuffer, const IntRect& sourceRect, const IntPoint& destinationPoint, AlphaPremultiplication destinationAlphaFormat, void* data)
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{
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auto sourceRectScaled = toBackendCoordinates(sourceRect);
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auto destinationPointScaled = toBackendCoordinates(destinationPoint);
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auto sourceRectClipped = intersection({ IntPoint::zero(), sourcePixelBuffer.size() }, sourceRectScaled);
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auto destinationRect = sourceRectClipped;
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destinationRect.moveBy(destinationPointScaled);
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if (sourceRectScaled.x() < 0)
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destinationRect.setX(destinationRect.x() - sourceRectScaled.x());
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if (sourceRectScaled.y() < 0)
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destinationRect.setY(destinationRect.y() - sourceRectScaled.y());
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destinationRect.intersect(backendRect());
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sourceRectClipped.setSize(destinationRect.size());
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ConstPixelBufferConversionView source {
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sourcePixelBuffer.format(),
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static_cast<unsigned>(4 * sourcePixelBuffer.size().width()),
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sourcePixelBuffer.data().data() + sourceRectClipped.y() * source.bytesPerRow + sourceRectClipped.x() * 4
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};
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PixelBufferConversionView destination {
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{ destinationAlphaFormat, pixelFormat(), colorSpace() },
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bytesPerRow(),
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static_cast<uint8_t*>(data) + destinationRect.y() * destination.bytesPerRow + destinationRect.x() * 4
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};
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convertImagePixels(source, destination, destinationRect.size());
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}
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} // namespace WebCore
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