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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CachedSubimage.h"
#include "GeometryUtilities.h"
#include "GraphicsContext.h"
namespace WebCore {
static FloatRect calculateCachedSubimageSourceRect(GraphicsContext& context, const FloatRect& destinationRect, const FloatRect& sourceRect, const FloatRect& imageRect)
{
auto scaleFactor = destinationRect.size() / sourceRect.size();
auto effectiveScaleFactor = scaleFactor * context.scaleFactor();
auto cachedSubimageSourceSize = CachedSubimage::maxSide / effectiveScaleFactor;
auto cachedSubimageSourceRect = FloatRect { sourceRect.center() - cachedSubimageSourceSize / 2, cachedSubimageSourceSize };
auto shift = [](const FloatSize& delta) -> FloatSize {
return FloatSize { std::max(0.0f, -delta.width()), std::max(0.0f, -delta.height()) };
};
// Move cachedSubimageSourceRect inside imageRect if needed.
cachedSubimageSourceRect.move(shift(cachedSubimageSourceRect.location() - imageRect.location()));
cachedSubimageSourceRect.move(-shift(imageRect.size() - cachedSubimageSourceRect.size()));
cachedSubimageSourceRect.intersect(imageRect);
return cachedSubimageSourceRect;
}
std::unique_ptr<CachedSubimage> CachedSubimage::create(GraphicsContext& context, const FloatSize& imageSize, const FloatRect& destinationRect, const FloatRect& sourceRect)
{
auto cachedSubimageSourceRect = calculateCachedSubimageSourceRect(context, destinationRect, sourceRect, FloatRect { { }, imageSize });
if (!(roundedIntRect(cachedSubimageSourceRect) == roundedIntRect(sourceRect) || cachedSubimageSourceRect.contains(sourceRect)))
return nullptr;
auto cachedSubimageDestinationRect = mapRect(cachedSubimageSourceRect, sourceRect, destinationRect);
auto imageBuffer = context.createScaledImageBuffer(cachedSubimageDestinationRect, context.scaleFactor(), DestinationColorSpace::SRGB(), RenderingMode::Unaccelerated, RenderingMethod::Local);
if (!imageBuffer)
return nullptr;
return makeUnique<CachedSubimage>(imageBuffer.releaseNonNull(), context.scaleFactor(), cachedSubimageDestinationRect, cachedSubimageSourceRect);
}
std::unique_ptr<CachedSubimage> CachedSubimage::createPixelated(GraphicsContext& context, const FloatRect& destinationRect, const FloatRect& sourceRect)
{
auto imageBuffer = context.createScaledImageBuffer(destinationRect, context.scaleFactor(), DestinationColorSpace::SRGB(), RenderingMode::Unaccelerated, RenderingMethod::Local);
if (!imageBuffer)
return nullptr;
return makeUnique<CachedSubimage>(imageBuffer.releaseNonNull(), context.scaleFactor(), destinationRect, sourceRect);
}
CachedSubimage::CachedSubimage(Ref<ImageBuffer>&& imageBuffer, const FloatSize& scaleFactor, const FloatRect& destinationRect, const FloatRect& sourceRect)
: m_imageBuffer(WTFMove(imageBuffer))
, m_scaleFactor(scaleFactor)
, m_destinationRect(destinationRect)
, m_sourceRect(sourceRect)
{
}
bool CachedSubimage::canBeUsed(GraphicsContext& context, const FloatRect& destinationRect, const FloatRect& sourceRect) const
{
if (context.scaleFactor() != m_scaleFactor)
return false;
if (!areEssentiallyEqual(destinationRect.size() / sourceRect.size(), m_destinationRect.size() / m_sourceRect.size()))
return false;
return m_sourceRect.contains(sourceRect);
}
void CachedSubimage::draw(GraphicsContext& context, const FloatRect& destinationRect, const FloatRect& sourceRect)
{
ASSERT(canBeUsed(context, destinationRect, sourceRect));
auto sourceRectScaled = sourceRect;
sourceRectScaled.move(toFloatSize(-m_sourceRect.location()));
auto scaleFactor = destinationRect.size() / sourceRect.size();
sourceRectScaled.scale(scaleFactor * context.scaleFactor());
m_imageBuffer->draw(context, destinationRect, sourceRectScaled, { });
}
} // namespace WebCore
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