mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
9423819dcc
The root is never scrollable, so position:fixed doesn't do anything anymore. Also remove some dead frame-level scrolling code that interacted with fixed position things. R=esprehn@chromium.org Review URL: https://codereview.chromium.org/686633002
96 lines
3.7 KiB
C++
96 lines
3.7 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "config.h"
|
|
#include "core/rendering/PaintInvalidationState.h"
|
|
|
|
#include "core/rendering/RenderInline.h"
|
|
#include "core/rendering/RenderLayer.h"
|
|
#include "core/rendering/RenderView.h"
|
|
#include "platform/Partitions.h"
|
|
|
|
namespace blink {
|
|
|
|
PaintInvalidationState::PaintInvalidationState(const RenderView& renderView)
|
|
: m_clipped(false)
|
|
, m_cachedOffsetsEnabled(true)
|
|
, m_forceCheckForPaintInvalidation(false)
|
|
, m_paintInvalidationContainer(*renderView.containerForPaintInvalidation())
|
|
, m_renderer(renderView)
|
|
{
|
|
bool establishesPaintInvalidationContainer = &m_renderer == &m_paintInvalidationContainer;
|
|
if (!establishesPaintInvalidationContainer) {
|
|
if (!renderView.supportsPaintInvalidationStateCachedOffsets()) {
|
|
m_cachedOffsetsEnabled = false;
|
|
return;
|
|
}
|
|
FloatPoint point = renderView.localToContainerPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
|
|
m_paintOffset = LayoutSize(point.x(), point.y());
|
|
}
|
|
m_clipRect = renderView.viewRect();
|
|
m_clipRect.move(m_paintOffset);
|
|
m_clipped = true;
|
|
}
|
|
|
|
PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& next, RenderLayerModelObject& renderer, const RenderLayerModelObject& paintInvalidationContainer)
|
|
: m_clipped(false)
|
|
, m_cachedOffsetsEnabled(true)
|
|
, m_forceCheckForPaintInvalidation(next.m_forceCheckForPaintInvalidation)
|
|
, m_paintInvalidationContainer(paintInvalidationContainer)
|
|
, m_renderer(renderer)
|
|
{
|
|
// FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054
|
|
bool establishesPaintInvalidationContainer = &m_renderer == &m_paintInvalidationContainer;
|
|
|
|
if (establishesPaintInvalidationContainer) {
|
|
// When we hit a new paint invalidation container, we don't need to
|
|
// continue forcing a check for paint invalidation because movement
|
|
// from our parents will just move the whole invalidation container.
|
|
m_forceCheckForPaintInvalidation = false;
|
|
} else {
|
|
if (!renderer.supportsPaintInvalidationStateCachedOffsets() || !next.m_cachedOffsetsEnabled) {
|
|
m_cachedOffsetsEnabled = false;
|
|
} else {
|
|
LayoutSize offset = m_renderer.isBox() ? toRenderBox(renderer).locationOffset() : LayoutSize();
|
|
m_paintOffset = next.m_paintOffset + offset;
|
|
|
|
if (m_renderer.isOutOfFlowPositioned()) {
|
|
if (RenderObject* container = m_renderer.container()) {
|
|
if (container->style()->hasInFlowPosition() && container->isRenderInline())
|
|
m_paintOffset += toRenderInline(container)->offsetForInFlowPositionedInline(toRenderBox(renderer));
|
|
}
|
|
}
|
|
|
|
if (m_renderer.style()->hasInFlowPosition() && renderer.hasLayer())
|
|
m_paintOffset += renderer.layer()->offsetForInFlowPosition();
|
|
}
|
|
|
|
m_clipped = next.m_clipped;
|
|
if (m_clipped)
|
|
m_clipRect = next.m_clipRect;
|
|
}
|
|
|
|
applyClipIfNeeded(renderer);
|
|
|
|
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
|
|
}
|
|
|
|
void PaintInvalidationState::applyClipIfNeeded(const RenderObject& renderer)
|
|
{
|
|
if (!renderer.hasOverflowClip())
|
|
return;
|
|
|
|
const RenderBox& box = toRenderBox(renderer);
|
|
LayoutRect clipRect(toPoint(m_paintOffset), box.layer()->size());
|
|
if (m_clipped) {
|
|
m_clipRect.intersect(clipRect);
|
|
} else {
|
|
m_clipRect = clipRect;
|
|
m_clipped = true;
|
|
}
|
|
m_paintOffset -= box.scrolledContentOffset();
|
|
}
|
|
|
|
} // namespace blink
|