Put transform tree building in DisplayItemPropertyTreeBuilder.

Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.cpp

Index: Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.cpp
diff --git a/Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.cpp b/Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.cpp
deleted file mode 100644
index f23c5182a0dfe7fbd6eba2d20b2bf819f4c7fd43..0000000000000000000000000000000000000000
--- a/Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.cpp
+++ /dev/null
@@ -1,111 +0,0 @@
-// Copyright 2015 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 "platform/graphics/paint/DisplayItemTransformTreeBuilder.h"
-
-#include "platform/graphics/paint/DisplayItem.h"
-#include "platform/graphics/paint/DisplayItemTransformTree.h"
-#include "platform/graphics/paint/Transform3DDisplayItem.h"
-
-namespace blink {
-
-DisplayItemTransformTreeBuilder::DisplayItemTransformTreeBuilder()
-    : m_transformTree(adoptPtr(new DisplayItemTransformTree))
-    , m_rangeBeginIndex(0)
-    , m_currentIndex(0)
-{
-    pushCurrentTransformNode(0 /* root node */, FloatSize());
-}
-
-DisplayItemTransformTreeBuilder::~DisplayItemTransformTreeBuilder()
-{
-}
-
-PassOwnPtr<DisplayItemTransformTree> DisplayItemTransformTreeBuilder::releaseTransformTree()
-{
-    ASSERT(m_currentTransformNodeStack.size() == 1);
-    ASSERT(currentTransformNodeData().ignoredBeginCount == 0);
-
-    finishRange();
-    return m_transformTree.release();
-}
-
-namespace {
-
-enum BeginDisplayItemClassification { NotATransform = 0, Only2DTranslation, RequiresTransformNode };
-
-// Classifies a display item based on whether it is a transform, and if so,
-// whether it should be get a transform node.
-// If it is a transform (including a translation), the TransformationMatrix
-// will be copied to output parameter.
-static BeginDisplayItemClassification classifyBeginItem(const DisplayItem& beginDisplayItem, TransformationMatrix* transform)
-{
-    ASSERT(beginDisplayItem.isBegin());
-
-    if (DisplayItem::isTransform3DType(beginDisplayItem.type())) {
-        const auto& begin3D = static_cast<const BeginTransform3DDisplayItem&>(beginDisplayItem);
-        *transform = begin3D.transform();
-        if (transform->isIdentityOr2DTranslation())
-            return Only2DTranslation;
-        return RequiresTransformNode;
-    }
-    return NotATransform;
-}
-
-} // namespace
-
-void DisplayItemTransformTreeBuilder::processDisplayItem(const DisplayItem& displayItem)
-{
-    if (displayItem.isBegin()) {
-        TransformationMatrix matrix;
-        switch (classifyBeginItem(displayItem, &matrix)) {
-        case NotATransform:
-            // Remember to ignore this begin later on.
-            currentTransformNodeData().ignoredBeginCount++;
-            break;
-        case Only2DTranslation:
-            // Adjust the offset associated with the current transform node.
-            finishRange();
-            pushCurrentTransformNode(
-                currentTransformNodeData().transformNode,
-                currentTransformNodeData().offset + matrix.to2DTranslation());
-            break;
-        case RequiresTransformNode:
-            // Emit a transform node.
-            finishRange();
-            size_t newNode = m_transformTree->createNewNode(
-                currentTransformNodeData().transformNode,
-                matrix);
-            pushCurrentTransformNode(newNode, FloatSize());
-            break;
-        }
-    } else if (displayItem.isEnd()) {
-        if (currentTransformNodeData().ignoredBeginCount) {
-            // Ignored this end display item.
-            currentTransformNodeData().ignoredBeginCount--;
-        } else {
-            // We've closed the scope of a transform.
-            finishRange();
-            popCurrentTransformNode();
-            ASSERT(!m_currentTransformNodeStack.isEmpty());
-        }
-    }
-    m_currentIndex++;
-}
-
-void DisplayItemTransformTreeBuilder::finishRange()
-{
-    // Don't emit an empty range record.
-    if (m_rangeBeginIndex != m_currentIndex) {
-        const auto& current = currentTransformNodeData();
-        m_transformTree->appendRangeRecord(m_rangeBeginIndex, m_currentIndex, current.transformNode, current.offset);
-    }
-
-    // The current display item is a boundary.
-    // The earliest the next range could begin is the next one.
-    m_rangeBeginIndex = m_currentIndex + 1;
-}
-
-} // namespace blink