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/*
* Copyright (C) 2012 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 "RenderGeometryMap.h"
#include "RenderFragmentedFlow.h"
#include "RenderLayer.h"
#include "RenderView.h"
#include "TransformState.h"
#include <wtf/SetForScope.h>
namespace WebCore {
RenderGeometryMap::RenderGeometryMap(MapCoordinatesFlags flags)
: m_insertionPosition(notFound)
, m_nonUniformStepsCount(0)
, m_transformedStepsCount(0)
, m_fixedStepsCount(0)
, m_mapCoordinatesFlags(flags)
{
}
RenderGeometryMap::~RenderGeometryMap() = default;
void RenderGeometryMap::mapToContainer(TransformState& transformState, const RenderLayerModelObject* container) const
{
// If the mapping includes something like columns, we have to go via renderers.
if (hasNonUniformStep()) {
m_mapping.last().m_renderer->mapLocalToContainer(container, transformState, ApplyContainerFlip | m_mapCoordinatesFlags);
transformState.flatten();
return;
}
bool inFixed = false;
#if ASSERT_ENABLED
bool foundContainer = !container || (m_mapping.size() && m_mapping[0].m_renderer == container);
#endif
for (int i = m_mapping.size() - 1; i >= 0; --i) {
const RenderGeometryMapStep& currentStep = m_mapping[i];
// If container is the RenderView (step 0) we want to apply its scroll offset.
if (i > 0 && currentStep.m_renderer == container) {
#if ASSERT_ENABLED
foundContainer = true;
#endif
break;
}
// If this box has a transform, it acts as a fixed position container
// for fixed descendants, which prevents the propagation of 'fixed'
// unless the layer itself is also fixed position.
if (i && currentStep.m_hasTransform && !currentStep.m_isFixedPosition)
inFixed = false;
else if (currentStep.m_isFixedPosition)
inFixed = true;
if (!i) {
// The root gets special treatment for fixed position
if (inFixed)
transformState.move(currentStep.m_offset.width(), currentStep.m_offset.height());
// A null container indicates mapping through the RenderView, so including its transform (the page scale).
if (!container && currentStep.m_transform)
transformState.applyTransform(*currentStep.m_transform.get());
} else {
TransformState::TransformAccumulation accumulate = currentStep.m_accumulatingTransform ? TransformState::AccumulateTransform : TransformState::FlattenTransform;
if (currentStep.m_transform)
transformState.applyTransform(*currentStep.m_transform.get(), accumulate);
else
transformState.move(currentStep.m_offset.width(), currentStep.m_offset.height(), accumulate);
}
}
ASSERT(foundContainer);
transformState.flatten();
}
FloatPoint RenderGeometryMap::mapToContainer(const FloatPoint& p, const RenderLayerModelObject* container) const
{
FloatPoint result;
#if ASSERT_ENABLED
FloatPoint rendererMappedResult = m_mapping.last().m_renderer->localToAbsolute(p, m_mapCoordinatesFlags);
#endif
if (!hasFixedPositionStep() && !hasTransformStep() && !hasNonUniformStep() && (!container || (m_mapping.size() && container == m_mapping[0].m_renderer))) {
result = p + roundedIntSize(m_accumulatedOffset);
// Should convert to a LayoutPoint because of the uniqueness of LayoutUnit::round
ASSERT(roundedIntPoint(LayoutPoint(rendererMappedResult)) == result);
} else {
TransformState transformState(TransformState::ApplyTransformDirection, p);
mapToContainer(transformState, container);
result = transformState.lastPlanarPoint();
ASSERT(areEssentiallyEqual(rendererMappedResult, result));
}
return result;
}
FloatQuad RenderGeometryMap::mapToContainer(const FloatRect& rect, const RenderLayerModelObject* container) const
{
FloatQuad result;
if (!hasFixedPositionStep() && !hasTransformStep() && !hasNonUniformStep() && (!container || (m_mapping.size() && container == m_mapping[0].m_renderer))) {
result = rect;
result.move(m_accumulatedOffset);
} else {
TransformState transformState(TransformState::ApplyTransformDirection, rect.center(), rect);
mapToContainer(transformState, container);
result = transformState.lastPlanarQuad();
}
return result;
}
void RenderGeometryMap::pushMappingsToAncestor(const RenderObject* renderer, const RenderLayerModelObject* ancestorRenderer)
{
// We need to push mappings in reverse order here, so do insertions rather than appends.
SetForScope<size_t> positionChange(m_insertionPosition, m_mapping.size());
do {
renderer = renderer->pushMappingToContainer(ancestorRenderer, *this);
} while (renderer && renderer != ancestorRenderer);
ASSERT(m_mapping.isEmpty() || m_mapping[0].m_renderer->isRenderView());
}
static bool canMapBetweenRenderersViaLayers(const RenderLayerModelObject& renderer, const RenderLayerModelObject& ancestor)
{
for (const RenderElement* current = &renderer; ; current = current->parent()) {
const RenderStyle& style = current->style();
if (current->isFixedPositioned() || style.isFlippedBlocksWritingMode())
return false;
if (current->hasTransformRelatedProperty() && (current->style().hasTransform() || current->style().hasPerspective()))
return false;
if (current->isRenderFragmentedFlow())
return false;
if (current->isSVGRoot())
return false;
if (current == &ancestor)
break;
}
return true;
}
void RenderGeometryMap::pushMappingsToAncestor(const RenderLayer* layer, const RenderLayer* ancestorLayer, bool respectTransforms)
{
MapCoordinatesFlags newFlags = respectTransforms ? m_mapCoordinatesFlags : m_mapCoordinatesFlags & ~UseTransforms;
SetForScope<MapCoordinatesFlags> flagsChange(m_mapCoordinatesFlags, newFlags);
const RenderLayerModelObject& renderer = layer->renderer();
// We have to visit all the renderers to detect flipped blocks. This might defeat the gains
// from mapping via layers.
bool canConvertInLayerTree = ancestorLayer ? canMapBetweenRenderersViaLayers(layer->renderer(), ancestorLayer->renderer()) : false;
if (canConvertInLayerTree) {
LayoutSize layerOffset = layer->offsetFromAncestor(ancestorLayer);
// The RenderView must be pushed first.
if (!m_mapping.size()) {
ASSERT(ancestorLayer->renderer().isRenderView());
pushMappingsToAncestor(&ancestorLayer->renderer(), nullptr);
}
SetForScope<size_t> positionChange(m_insertionPosition, m_mapping.size());
push(&renderer, layerOffset, /*accumulatingTransform*/ true, /*isNonUniform*/ false, /*isFixedPosition*/ false, /*hasTransform*/ false);
return;
}
const RenderLayerModelObject* ancestorRenderer = ancestorLayer ? &ancestorLayer->renderer() : nullptr;
pushMappingsToAncestor(&renderer, ancestorRenderer);
}
void RenderGeometryMap::push(const RenderObject* renderer, const LayoutSize& offsetFromContainer, bool accumulatingTransform, bool isNonUniform, bool isFixedPosition, bool hasTransform)
{
ASSERT(m_insertionPosition != notFound);
m_mapping.insert(m_insertionPosition, RenderGeometryMapStep(renderer, accumulatingTransform, isNonUniform, isFixedPosition, hasTransform));
RenderGeometryMapStep& step = m_mapping[m_insertionPosition];
step.m_offset = offsetFromContainer;
stepInserted(step);
}
void RenderGeometryMap::push(const RenderObject* renderer, const TransformationMatrix& t, bool accumulatingTransform, bool isNonUniform, bool isFixedPosition, bool hasTransform)
{
ASSERT(m_insertionPosition != notFound);
m_mapping.insert(m_insertionPosition, RenderGeometryMapStep(renderer, accumulatingTransform, isNonUniform, isFixedPosition, hasTransform));
RenderGeometryMapStep& step = m_mapping[m_insertionPosition];
if (!t.isIntegerTranslation())
step.m_transform = makeUnique<TransformationMatrix>(t);
else
step.m_offset = LayoutSize(t.e(), t.f());
stepInserted(step);
}
void RenderGeometryMap::pushView(const RenderView* view, const LayoutSize& scrollOffset, const TransformationMatrix* t)
{
ASSERT(m_insertionPosition != notFound);
ASSERT(!m_insertionPosition); // The view should always be the first step.
m_mapping.insert(m_insertionPosition, RenderGeometryMapStep(view, false, false, false, t));
RenderGeometryMapStep& step = m_mapping[m_insertionPosition];
step.m_offset = scrollOffset;
if (t)
step.m_transform = makeUnique<TransformationMatrix>(*t);
stepInserted(step);
}
void RenderGeometryMap::pushRenderFragmentedFlow(const RenderFragmentedFlow* fragmentedFlow)
{
m_mapping.append(RenderGeometryMapStep(fragmentedFlow, false, false, false, false));
stepInserted(m_mapping.last());
}
void RenderGeometryMap::popMappingsToAncestor(const RenderLayerModelObject* ancestorRenderer)
{
ASSERT(m_mapping.size());
while (m_mapping.size() && m_mapping.last().m_renderer != ancestorRenderer) {
stepRemoved(m_mapping.last());
m_mapping.removeLast();
}
}
void RenderGeometryMap::popMappingsToAncestor(const RenderLayer* ancestorLayer)
{
const RenderLayerModelObject* ancestorRenderer = ancestorLayer ? &ancestorLayer->renderer() : 0;
popMappingsToAncestor(ancestorRenderer);
}
void RenderGeometryMap::stepInserted(const RenderGeometryMapStep& step)
{
// RenderView's offset, is only applied when we have fixed-positions.
if (!step.m_renderer->isRenderView())
m_accumulatedOffset += step.m_offset;
if (step.m_isNonUniform)
++m_nonUniformStepsCount;
if (step.m_transform)
++m_transformedStepsCount;
if (step.m_isFixedPosition)
++m_fixedStepsCount;
}
void RenderGeometryMap::stepRemoved(const RenderGeometryMapStep& step)
{
// RenderView's offset, is only applied when we have fixed-positions.
if (!step.m_renderer->isRenderView())
m_accumulatedOffset -= step.m_offset;
if (step.m_isNonUniform) {
ASSERT(m_nonUniformStepsCount);
--m_nonUniformStepsCount;
}
if (step.m_transform) {
ASSERT(m_transformedStepsCount);
--m_transformedStepsCount;
}
if (step.m_isFixedPosition) {
ASSERT(m_fixedStepsCount);
--m_fixedStepsCount;
}
}
} // namespace WebCore