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/*
* Copyright (C) 2013 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. AND ITS 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 APPLE INC. OR ITS 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 "ImageQualityController.h"
#include "Frame.h"
#include "GraphicsContext.h"
#include "Page.h"
#include "RenderBoxModelObject.h"
#include "RenderView.h"
namespace WebCore {
static const double cInterpolationCutoff = 800. * 800.;
static const double cLowQualityTimeThreshold = 0.500; // 500 ms
ImageQualityController::ImageQualityController(const RenderView& renderView)
: m_renderView(renderView)
, m_timer(*this, &ImageQualityController::highQualityRepaintTimerFired)
{
}
void ImageQualityController::removeLayer(RenderBoxModelObject* object, LayerSizeMap* innerMap, const void* layer)
{
if (!innerMap)
return;
innerMap->remove(layer);
if (innerMap->isEmpty())
removeObject(object);
}
void ImageQualityController::set(RenderBoxModelObject* object, LayerSizeMap* innerMap, const void* layer, const LayoutSize& size)
{
if (innerMap)
innerMap->set(layer, size);
else {
LayerSizeMap newInnerMap;
newInnerMap.set(layer, size);
m_objectLayerSizeMap.set(object, newInnerMap);
}
}
void ImageQualityController::removeObject(RenderBoxModelObject* object)
{
m_objectLayerSizeMap.remove(object);
if (m_objectLayerSizeMap.isEmpty()) {
m_animatedResizeIsActive = false;
m_timer.stop();
}
}
void ImageQualityController::highQualityRepaintTimerFired()
{
if (m_renderView.documentBeingDestroyed())
return;
if (!m_animatedResizeIsActive && !m_liveResizeOptimizationIsActive)
return;
m_animatedResizeIsActive = false;
// If the FrameView is in live resize, punt the timer and hold back for now.
if (m_renderView.frameView().inLiveResize()) {
restartTimer();
return;
}
for (auto it = m_objectLayerSizeMap.begin(), end = m_objectLayerSizeMap.end(); it != end; ++it)
it->key->repaint();
m_liveResizeOptimizationIsActive = false;
}
void ImageQualityController::restartTimer()
{
m_timer.startOneShot(cLowQualityTimeThreshold);
}
Optional<InterpolationQuality> ImageQualityController::interpolationQualityFromStyle(const RenderStyle& style)
{
switch (style.imageRendering()) {
case ImageRenderingOptimizeSpeed:
return InterpolationLow;
case ImageRenderingCrispEdges:
case ImageRenderingPixelated:
return InterpolationNone;
case ImageRenderingOptimizeQuality:
return InterpolationDefault; // FIXME: CSS 3 Images says that optimizeQuality should behave like 'auto', but that prevents authors from overriding this low quality rendering behavior.
case ImageRenderingAuto:
break;
}
return Nullopt;
}
InterpolationQuality ImageQualityController::chooseInterpolationQuality(GraphicsContext& context, RenderBoxModelObject* object, Image& image, const void *layer, const LayoutSize& size)
{
// If the image is not a bitmap image, then none of this is relevant and we just paint at high quality.
if (!(image.isBitmapImage() || image.isPDFDocumentImage()) || context.paintingDisabled())
return InterpolationDefault;
if (Optional<InterpolationQuality> styleInterpolation = interpolationQualityFromStyle(object->style()))
return styleInterpolation.value();
// Make sure to use the unzoomed image size, since if a full page zoom is in effect, the image
// is actually being scaled.
IntSize imageSize(image.width(), image.height());
// Look ourselves up in the hashtables.
auto i = m_objectLayerSizeMap.find(object);
LayerSizeMap* innerMap = i != m_objectLayerSizeMap.end() ? &i->value : 0;
LayoutSize oldSize;
bool isFirstResize = true;
if (innerMap) {
LayerSizeMap::iterator j = innerMap->find(layer);
if (j != innerMap->end()) {
isFirstResize = false;
oldSize = j->value;
}
}
// If the containing FrameView is being resized, paint at low quality until resizing is finished.
if (Frame* frame = object->document().frame()) {
bool frameViewIsCurrentlyInLiveResize = frame->view() && frame->view()->inLiveResize();
if (frameViewIsCurrentlyInLiveResize) {
set(object, innerMap, layer, size);
restartTimer();
m_liveResizeOptimizationIsActive = true;
return InterpolationLow;
}
if (m_liveResizeOptimizationIsActive)
return InterpolationDefault;
}
const AffineTransform& currentTransform = context.getCTM();
bool contextIsScaled = !currentTransform.isIdentityOrTranslationOrFlipped();
if (!contextIsScaled && size == imageSize) {
// 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 InterpolationDefault;
}
// There is no need to hash scaled images that always use low quality mode when the page demands it. This is the iChat case.
if (m_renderView.frame().page()->inLowQualityImageInterpolationMode()) {
double totalPixels = static_cast<double>(image.width()) * static_cast<double>(image.height());
if (totalPixels > cInterpolationCutoff)
return InterpolationLow;
}
// If an animated resize is active, paint in low quality and kick the timer ahead.
if (m_animatedResizeIsActive) {
set(object, innerMap, layer, size);
restartTimer();
return InterpolationLow;
}
// 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 == size) {
restartTimer();
set(object, innerMap, layer, size);
return InterpolationDefault;
}
// 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 InterpolationDefault;
}
// 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, size);
m_animatedResizeIsActive = true;
restartTimer();
return InterpolationLow;
}
}
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