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/*
* Copyright (C) 2013 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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 "core/layout/ImageQualityController.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
namespace blink {
static const double cLowQualityTimeThreshold = 0.500; // 500 ms
static ImageQualityController* gImageQualityController = nullptr;
ImageQualityController* ImageQualityController::imageQualityController()
{
if (!gImageQualityController)
gImageQualityController = new ImageQualityController;
return gImageQualityController;
}
void ImageQualityController::remove(LayoutObject& layoutObject)
{
if (gImageQualityController) {
gImageQualityController->objectDestroyed(layoutObject);
if (gImageQualityController->isEmpty()) {
delete gImageQualityController;
gImageQualityController = nullptr;
}
}
}
bool ImageQualityController::has(const LayoutObject& layoutObject)
{
return gImageQualityController && gImageQualityController->m_objectLayerSizeMap.contains(&layoutObject);
}
InterpolationQuality ImageQualityController::chooseInterpolationQuality(const LayoutObject& object, Image* image, const void* layer, const LayoutSize& layoutSize)
{
if (object.style()->imageRendering() == ImageRenderingPixelated)
return InterpolationNone;
if (InterpolationDefault == InterpolationLow)
return InterpolationLow;
if (shouldPaintAtLowQuality(object, image, layer, layoutSize))
return InterpolationLow;
// For images that are potentially animated we paint them at medium quality.
if (image && image->maybeAnimated())
return InterpolationMedium;
return InterpolationDefault;
}
ImageQualityController::~ImageQualityController()
{
// This will catch users of ImageQualityController that forget to call cleanUp.
ASSERT(!gImageQualityController || gImageQualityController->isEmpty());
}
ImageQualityController::ImageQualityController()
: m_timer(adoptPtr(new Timer<ImageQualityController>(this, &ImageQualityController::highQualityRepaintTimerFired)))
{
}
void ImageQualityController::setTimer(Timer<ImageQualityController>* newTimer)
{
m_timer = adoptPtr(newTimer);
}
void ImageQualityController::removeLayer(const LayoutObject& object, LayerSizeMap* innerMap, const void* layer)
{
if (innerMap) {
innerMap->remove(layer);
if (innerMap->isEmpty())
objectDestroyed(object);
}
}
void ImageQualityController::set(const LayoutObject& object, LayerSizeMap* innerMap, const void* layer, const LayoutSize& size, bool isResizing)
{
if (innerMap) {
innerMap->set(layer, size);
m_objectLayerSizeMap.find(&object)->value.isResizing = isResizing;
} else {
ObjectResizeInfo newResizeInfo;
newResizeInfo.layerSizeMap.set(layer, size);
newResizeInfo.isResizing = isResizing;
m_objectLayerSizeMap.set(&object, newResizeInfo);
}
}
void ImageQualityController::objectDestroyed(const LayoutObject& object)
{
m_objectLayerSizeMap.remove(&object);
if (m_objectLayerSizeMap.isEmpty()) {
m_timer->stop();
}
}
void ImageQualityController::highQualityRepaintTimerFired(Timer<ImageQualityController>*)
{
for (auto* layoutObject : m_objectLayerSizeMap.keys()) {
ObjectLayerSizeMap::iterator i = m_objectLayerSizeMap.find(layoutObject);
if (i != m_objectLayerSizeMap.end()) {
// Only invalidate the object if it is animating.
if (i->value.isResizing) {
// TODO(wangxianzhu): Use LayoutObject::getMutableForPainting().
const_cast<LayoutObject*>(layoutObject)->setShouldDoFullPaintInvalidation();
}
i->value.isResizing = false;
}
}
}
void ImageQualityController::restartTimer()
{
m_timer->startOneShot(cLowQualityTimeThreshold, BLINK_FROM_HERE);
}
bool ImageQualityController::shouldPaintAtLowQuality(const LayoutObject& object, Image* image, const void *layer, const LayoutSize& layoutSize)
{
// If the image is not a bitmap image, then none of this is relevant and we just paint at high
// quality.
if (!image || !image->isBitmapImage())
return false;
if (!layer)
return false;
if (object.style()->imageRendering() == ImageRenderingOptimizeContrast)
return true;
// Look ourselves up in the hashtables.
ObjectLayerSizeMap::iterator i = m_objectLayerSizeMap.find(&object);
LayerSizeMap* innerMap = nullptr;
bool objectIsResizing = false;
if (i != m_objectLayerSizeMap.end()) {
innerMap = &i->value.layerSizeMap;
objectIsResizing = i->value.isResizing;
}
LayoutSize oldSize;
bool isFirstResize = true;
if (innerMap) {
LayerSizeMap::iterator j = innerMap->find(layer);
if (j != innerMap->end()) {
isFirstResize = false;
oldSize = j->value;
}
}
if (layoutSize == image->size()) {
// There is no scale in effect. If we had a scale in effect before, we can just remove this object from the list.
removeLayer(object, innerMap, layer);
return false;
}
// If an animated resize is active for this object, paint in low quality and kick the timer ahead.
if (objectIsResizing) {
bool sizesChanged = oldSize != layoutSize;
set(object, innerMap, layer, layoutSize, sizesChanged);
if (sizesChanged)
restartTimer();
return true;
}
// If this is the first time resizing this image, or its size is the
// same as the last resize, draw at high res, but record the paint
// size and set the timer.
if (isFirstResize || oldSize == layoutSize) {
restartTimer();
set(object, innerMap, layer, layoutSize, false);
return false;
}
// If the timer is no longer active, draw at high quality and don't
// set the timer.
if (!m_timer->isActive()) {
removeLayer(object, innerMap, layer);
return false;
}
// This object has been resized to two different sizes while the timer
// is active, so draw at low quality, set the flag for animated resizes and
// the object to the list for high quality redraw.
set(object, innerMap, layer, layoutSize, true);
restartTimer();
return true;
}
} // namespace blink
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