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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003-2021 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "StyleGeneratedImage.h"
#include "GeneratedImage.h"
#include "RenderElement.h"
#include "StyleResolver.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
static const Seconds timeToKeepCachedGeneratedImages { 3_s };
// MARK: - CachedGeneratedImage
class StyleGeneratedImage::CachedGeneratedImage {
WTF_MAKE_TZONE_ALLOCATED_INLINE(CachedGeneratedImage);
public:
CachedGeneratedImage(StyleGeneratedImage&, FloatSize, GeneratedImage&);
GeneratedImage& image() const { return m_image; }
void puntEvictionTimer() { m_evictionTimer.restart(); }
private:
void evictionTimerFired();
StyleGeneratedImage& m_owner;
const FloatSize m_size;
const Ref<GeneratedImage> m_image;
DeferrableOneShotTimer m_evictionTimer;
};
inline StyleGeneratedImage::CachedGeneratedImage::CachedGeneratedImage(StyleGeneratedImage& owner, FloatSize size, GeneratedImage& image)
: m_owner(owner)
, m_size(size)
, m_image(image)
, m_evictionTimer(*this, &StyleGeneratedImage::CachedGeneratedImage::evictionTimerFired, timeToKeepCachedGeneratedImages)
{
m_evictionTimer.restart();
}
void StyleGeneratedImage::CachedGeneratedImage::evictionTimerFired()
{
// NOTE: This is essentially a "delete this", the object is no longer valid after this line.
m_owner.evictCachedGeneratedImage(m_size);
}
// MARK: - StyleGeneratedImage.
StyleGeneratedImage::StyleGeneratedImage(StyleImage::Type type, bool fixedSize)
: StyleImage { type }
, m_fixedSize { fixedSize }
{
}
StyleGeneratedImage::~StyleGeneratedImage() = default;
GeneratedImage* StyleGeneratedImage::cachedImageForSize(FloatSize size)
{
if (size.isEmpty())
return nullptr;
auto* cachedGeneratedImage = m_images.get(size);
if (!cachedGeneratedImage)
return nullptr;
cachedGeneratedImage->puntEvictionTimer();
return &cachedGeneratedImage->image();
}
void StyleGeneratedImage::saveCachedImageForSize(FloatSize size, GeneratedImage& image)
{
ASSERT(!m_images.contains(size));
m_images.add(size, makeUnique<CachedGeneratedImage>(*this, size, image));
}
void StyleGeneratedImage::evictCachedGeneratedImage(FloatSize size)
{
ASSERT(m_images.contains(size));
m_images.remove(size);
}
FloatSize StyleGeneratedImage::imageSize(const RenderElement* renderer, float multiplier) const
{
if (!m_fixedSize)
return m_containerSize;
if (!renderer)
return { };
FloatSize fixedSize = this->fixedSize(*renderer);
if (multiplier == 1.0f)
return fixedSize;
float width = fixedSize.width() * multiplier;
float height = fixedSize.height() * multiplier;
// Don't let images that have a width/height >= 1 shrink below 1 device pixel when zoomed.
float deviceScaleFactor = renderer->document().deviceScaleFactor();
if (fixedSize.width() > 0)
width = std::max<float>(1 / deviceScaleFactor, width);
if (fixedSize.height() > 0)
height = std::max<float>(1 / deviceScaleFactor, height);
return { width, height };
}
void StyleGeneratedImage::computeIntrinsicDimensions(const RenderElement* renderer, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
{
// At a zoom level of 1 the image is guaranteed to have a device pixel size.
FloatSize size = floorSizeToDevicePixels(LayoutSize(this->imageSize(renderer, 1)), renderer ? renderer->document().deviceScaleFactor() : 1);
intrinsicWidth = Length(size.width(), LengthType::Fixed);
intrinsicHeight = Length(size.height(), LengthType::Fixed);
intrinsicRatio = size;
}
// MARK: Client support.
void StyleGeneratedImage::addClient(RenderElement& renderer)
{
if (m_clients.isEmptyIgnoringNullReferences())
ref();
m_clients.add(renderer);
this->didAddClient(renderer);
}
void StyleGeneratedImage::removeClient(RenderElement& renderer)
{
ASSERT(m_clients.contains(renderer));
if (!m_clients.remove(renderer))
return;
this->didRemoveClient(renderer);
if (m_clients.isEmptyIgnoringNullReferences())
deref();
}
bool StyleGeneratedImage::hasClient(RenderElement& renderer) const
{
return m_clients.contains(renderer);
}
} // namespace WebCore
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