Delete most of rendering/compositing.

sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp

-// 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 "sky/engine/config.h"
-#include "sky/engine/core/rendering/compositing/CompositingReasonFinder.h"
-
-#include "gen/sky/core/CSSPropertyNames.h"
-#include "sky/engine/core/dom/Document.h"
-#include "sky/engine/core/frame/FrameView.h"
-#include "sky/engine/core/frame/Settings.h"
-#include "sky/engine/core/page/Page.h"
-#include "sky/engine/core/rendering/RenderView.h"
-#include "sky/engine/core/rendering/compositing/RenderLayerCompositor.h"
-
-namespace blink {
-
-CompositingReasonFinder::CompositingReasonFinder(RenderView& renderView)
-    : m_renderView(renderView)
-    , m_compositingTriggers(static_cast<CompositingTriggerFlags>(AllCompositingTriggers))
-{
-    updateTriggers();
-}
-
-void CompositingReasonFinder::updateTriggers()
-{
-    m_compositingTriggers = 0;
-
-    Settings& settings = m_renderView.document().page()->settings();
-    if (settings.preferCompositingToLCDTextEnabled()) {
-        m_compositingTriggers |= ScrollableInnerFrameTrigger;
-        m_compositingTriggers |= OverflowScrollTrigger;
-    }
-}
-
-bool CompositingReasonFinder::hasOverflowScrollTrigger() const
-{
-    return m_compositingTriggers & OverflowScrollTrigger;
-}
-
-CompositingReasons CompositingReasonFinder::directReasons(const RenderLayer* layer) const
-{
-    ASSERT(potentialCompositingReasonsFromStyle(layer->renderer()) == layer->potentialCompositingReasonsFromStyle());
-    CompositingReasons styleDeterminedDirectCompositingReasons = layer->potentialCompositingReasonsFromStyle() & CompositingReasonComboAllDirectStyleDeterminedReasons;
-    return styleDeterminedDirectCompositingReasons | nonStyleDeterminedDirectReasons(layer);
-}
-
-// This information doesn't appear to be incorporated into CompositingReasons.
-bool CompositingReasonFinder::requiresCompositingForScrollableFrame() const
-{
-    // FIXME(sky)
-    return false;
-}
-
-CompositingReasons CompositingReasonFinder::potentialCompositingReasonsFromStyle(RenderObject* renderer) const
-{
-    CompositingReasons reasons = CompositingReasonNone;
-
-    RenderStyle* style = renderer->style();
-
-    if (requiresCompositingForTransform(renderer))
-        reasons |= CompositingReason3DTransform;
-
-    if (style->backfaceVisibility() == BackfaceVisibilityHidden)
-        reasons |= CompositingReasonBackfaceVisibilityHidden;
-
-    if (requiresCompositingForAnimation(style))
-        reasons |= CompositingReasonActiveAnimation;
-
-    if (style->hasWillChangeCompositingHint() && !style->subtreeWillChangeContents())
-        reasons |= CompositingReasonWillChangeCompositingHint;
-
-    if (style->hasInlineTransform())
-        reasons |= CompositingReasonInlineTransform;
-
-    if (style->transformStyle3D() == TransformStyle3DPreserve3D)
-        reasons |= CompositingReasonPreserve3DWith3DDescendants;
-
-    if (style->hasPerspective())
-        reasons |= CompositingReasonPerspectiveWith3DDescendants;
-
-    // If the implementation of createsGroup changes, we need to be aware of that in this part of code.
-    ASSERT((renderer->isTransparent() || renderer->hasMask() || renderer->hasFilter()) == renderer->createsGroup());
-
-    if (style->hasMask())
-        reasons |= CompositingReasonMaskWithCompositedDescendants;
-
-    if (style->hasFilter())
-        reasons |= CompositingReasonFilterWithCompositedDescendants;
-
-    // See RenderLayer::updateTransform for an explanation of why we check both.
-    if (renderer->hasTransform() && style->hasTransform())
-        reasons |= CompositingReasonTransformWithCompositedDescendants;
-
-    if (renderer->isTransparent())
-        reasons |= CompositingReasonOpacityWithCompositedDescendants;
-
-    ASSERT(!(reasons & ~CompositingReasonComboAllStyleDeterminedReasons));
-    return reasons;
-}
-
-bool CompositingReasonFinder::requiresCompositingForTransform(RenderObject* renderer) const
-{
-    // Note that we ask the renderer if it has a transform, because the style may have transforms,
-    // but the renderer may be an inline that doesn't suppport them.
-    return renderer->hasTransform() && renderer->style()->transform().has3DOperation();
-}
-
-CompositingReasons CompositingReasonFinder::nonStyleDeterminedDirectReasons(const RenderLayer* layer) const
-{
-    CompositingReasons directReasons = CompositingReasonNone;
-    RenderObject* renderer = layer->renderer();
-
-    if (hasOverflowScrollTrigger()) {
-        if (layer->clipParent())
-            directReasons |= CompositingReasonOutOfFlowClipping;
-
-        if (const RenderLayer* scrollingAncestor = layer->ancestorScrollingLayer()) {
-            if (scrollingAncestor->needsCompositedScrolling() && layer->scrollParent())
-                directReasons |= CompositingReasonOverflowScrollingParent;
-        }
-
-        if (layer->needsCompositedScrolling())
-            directReasons |= CompositingReasonOverflowScrollingTouch;
-    }
-
-    directReasons |= renderer->additionalCompositingReasons();
-
-    ASSERT(!(directReasons & CompositingReasonComboAllStyleDeterminedReasons));
-    return directReasons;
-}
-
-bool CompositingReasonFinder::requiresCompositingForAnimation(RenderStyle* style) const
-{
-    if (style->subtreeWillChangeContents())
-        return style->isRunningAnimationOnCompositor();
-
-    return style->shouldCompositeForCurrentAnimations();
-}
-
-}