Part 7 of cc/ directory shuffles: trees

Continuation of https://src.chromium.org/viewvc/chrome?view=rev&revision=188681

BUG=190824
TBR=enne@chromium.org, piman@chromium.org

Review URL: https://codereview.chromium.org/12722007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@188694 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 118 insertions, 0 deletions

diff --git a/cc/trees/layer_tree_host_common.h b/cc/trees/layer_tree_host_common.h
new file mode 100644
index 0000000..1e33c65
--- /dev/null
+++ b/cc/trees/layer_tree_host_common.h
@@ -0,0 +1,118 @@
+// Copyright 2011 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.
+
+#ifndef CC_TREES_LAYER_TREE_HOST_COMMON_H_
+#define CC_TREES_LAYER_TREE_HOST_COMMON_H_
+
+#include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
+#include "cc/base/scoped_ptr_vector.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/transform.h"
+#include "ui/gfx/vector2d.h"
+
+namespace cc {
+
+class LayerImpl;
+class Layer;
+
+class CC_EXPORT LayerTreeHostCommon {
+public:
+    static gfx::Rect calculateVisibleRect(const gfx::Rect& targetSurfaceRect, const gfx::Rect& layerBoundRect, const gfx::Transform&);
+
+    static void calculateDrawProperties(Layer* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, bool canUseLCDText, std::vector<scoped_refptr<Layer> >& renderSurfaceLayerList);
+    static void calculateDrawProperties(LayerImpl* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, bool canUseLCDText, std::vector<LayerImpl*>& renderSurfaceLayerList, bool updateTilePriorities);
+
+    // Performs hit testing for a given renderSurfaceLayerList.
+    static LayerImpl* findLayerThatIsHitByPoint(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList);
+
+    static LayerImpl* findLayerThatIsHitByPointInTouchHandlerRegion(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList);
+
+    static bool layerHasTouchEventHandlersAt(const gfx::PointF& screenSpacePoint, LayerImpl* layerImpl);
+
+    template<typename LayerType> static bool renderSurfaceContributesToTarget(LayerType*, int targetSurfaceLayerID);
+
+    template<class Function, typename LayerType> static void callFunctionForSubtree(LayerType* rootLayer);
+
+    // Returns a layer with the given id if one exists in the subtree starting
+    // from the given root layer (including mask and replica layers).
+    template<typename LayerType> static LayerType* findLayerInSubtree(LayerType* rootLayer, int layerId);
+
+    static Layer* getChildAsRawPtr(const std::vector<scoped_refptr<Layer> >& children, size_t index)
+    {
+        return children[index].get();
+    }
+
+    static LayerImpl* getChildAsRawPtr(const ScopedPtrVector<LayerImpl>& children, size_t index)
+    {
+        return children[index];
+    }
+
+    struct ScrollUpdateInfo {
+        int layerId;
+        gfx::Vector2d scrollDelta;
+    };
+};
+
+struct CC_EXPORT ScrollAndScaleSet {
+    ScrollAndScaleSet();
+    ~ScrollAndScaleSet();
+
+    std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
+    float pageScaleDelta;
+};
+
+template<typename LayerType>
+bool LayerTreeHostCommon::renderSurfaceContributesToTarget(LayerType* layer, int targetSurfaceLayerID)
+{
+    // A layer will either contribute its own content, or its render surface's content, to
+    // the target surface. The layer contributes its surface's content when both the
+    // following are true:
+    //  (1) The layer actually has a renderSurface, and
+    //  (2) The layer's renderSurface is not the same as the targetSurface.
+    //
+    // Otherwise, the layer just contributes itself to the target surface.
+
+    return layer->render_surface() && layer->id() != targetSurfaceLayerID;
+}
+
+template<typename LayerType>
+LayerType* LayerTreeHostCommon::findLayerInSubtree(LayerType* rootLayer, int layerId)
+{
+    if (rootLayer->id() == layerId)
+        return rootLayer;
+
+    if (rootLayer->mask_layer() && rootLayer->mask_layer()->id() == layerId)
+        return rootLayer->mask_layer();
+
+    if (rootLayer->replica_layer() && rootLayer->replica_layer()->id() == layerId)
+        return rootLayer->replica_layer();
+
+    for (size_t i = 0; i < rootLayer->children().size(); ++i) {
+        if (LayerType* found = findLayerInSubtree(getChildAsRawPtr(rootLayer->children(), i), layerId))
+            return found;
+    }
+    return 0;
+}
+
+template<class Function, typename LayerType>
+void LayerTreeHostCommon::callFunctionForSubtree(LayerType* rootLayer)
+{
+    Function()(rootLayer);
+   
+    if (LayerType* maskLayer = rootLayer->mask_layer())
+        Function()(maskLayer);
+    if (LayerType* replicaLayer = rootLayer->replica_layer()) {
+        Function()(replicaLayer);
+        if (LayerType* maskLayer = replicaLayer->mask_layer())
+            Function()(maskLayer);
+    }
+
+    for (size_t i = 0; i < rootLayer->children().size(); ++i)
+        callFunctionForSubtree<Function>(getChildAsRawPtr(rootLayer->children(), i));
+}
+
+}  // namespace cc
+
+#endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_