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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "config.h" | |
| 6 #include "platform/graphics/paint/DisplayItemTransformTreeBuilder.h" | |
| 7 | |
| 8 #include "platform/graphics/paint/DisplayItem.h" | |
| 9 #include "platform/graphics/paint/DisplayItemTransformTree.h" | |
| 10 #include "platform/graphics/paint/Transform3DDisplayItem.h" | |
| 11 | |
| 12 namespace blink { | |
| 13 | |
| 14 DisplayItemTransformTreeBuilder::DisplayItemTransformTreeBuilder() | |
| 15 : m_transformTree(adoptPtr(new DisplayItemTransformTree)) | |
| 16 , m_rangeBeginIndex(0) | |
| 17 , m_currentIndex(0) | |
| 18 { | |
| 19 pushCurrentTransformNode(0 /* root node */, FloatSize()); | |
| 20 } | |
| 21 | |
| 22 DisplayItemTransformTreeBuilder::~DisplayItemTransformTreeBuilder() | |
| 23 { | |
| 24 } | |
| 25 | |
| 26 PassOwnPtr<DisplayItemTransformTree> DisplayItemTransformTreeBuilder::releaseTra
nsformTree() | |
| 27 { | |
| 28 ASSERT(m_currentTransformNodeStack.size() == 1); | |
| 29 ASSERT(currentTransformNodeData().ignoredBeginCount == 0); | |
| 30 | |
| 31 finishRange(); | |
| 32 return m_transformTree.release(); | |
| 33 } | |
| 34 | |
| 35 namespace { | |
| 36 | |
| 37 enum BeginDisplayItemClassification { NotATransform = 0, Only2DTranslation, Requ
iresTransformNode }; | |
| 38 | |
| 39 // Classifies a display item based on whether it is a transform, and if so, | |
| 40 // whether it should be get a transform node. | |
| 41 // If it is a transform (including a translation), the TransformationMatrix | |
| 42 // will be copied to output parameter. | |
| 43 static BeginDisplayItemClassification classifyBeginItem(const DisplayItem& begin
DisplayItem, TransformationMatrix* transform) | |
| 44 { | |
| 45 ASSERT(beginDisplayItem.isBegin()); | |
| 46 | |
| 47 if (DisplayItem::isTransform3DType(beginDisplayItem.type())) { | |
| 48 const auto& begin3D = static_cast<const BeginTransform3DDisplayItem&>(be
ginDisplayItem); | |
| 49 *transform = begin3D.transform(); | |
| 50 if (transform->isIdentityOr2DTranslation()) | |
| 51 return Only2DTranslation; | |
| 52 return RequiresTransformNode; | |
| 53 } | |
| 54 return NotATransform; | |
| 55 } | |
| 56 | |
| 57 } // namespace | |
| 58 | |
| 59 void DisplayItemTransformTreeBuilder::processDisplayItem(const DisplayItem& disp
layItem) | |
| 60 { | |
| 61 if (displayItem.isBegin()) { | |
| 62 TransformationMatrix matrix; | |
| 63 switch (classifyBeginItem(displayItem, &matrix)) { | |
| 64 case NotATransform: | |
| 65 // Remember to ignore this begin later on. | |
| 66 currentTransformNodeData().ignoredBeginCount++; | |
| 67 break; | |
| 68 case Only2DTranslation: | |
| 69 // Adjust the offset associated with the current transform node. | |
| 70 finishRange(); | |
| 71 pushCurrentTransformNode( | |
| 72 currentTransformNodeData().transformNode, | |
| 73 currentTransformNodeData().offset + matrix.to2DTranslation()); | |
| 74 break; | |
| 75 case RequiresTransformNode: | |
| 76 // Emit a transform node. | |
| 77 finishRange(); | |
| 78 size_t newNode = m_transformTree->createNewNode( | |
| 79 currentTransformNodeData().transformNode, | |
| 80 matrix); | |
| 81 pushCurrentTransformNode(newNode, FloatSize()); | |
| 82 break; | |
| 83 } | |
| 84 } else if (displayItem.isEnd()) { | |
| 85 if (currentTransformNodeData().ignoredBeginCount) { | |
| 86 // Ignored this end display item. | |
| 87 currentTransformNodeData().ignoredBeginCount--; | |
| 88 } else { | |
| 89 // We've closed the scope of a transform. | |
| 90 finishRange(); | |
| 91 popCurrentTransformNode(); | |
| 92 ASSERT(!m_currentTransformNodeStack.isEmpty()); | |
| 93 } | |
| 94 } | |
| 95 m_currentIndex++; | |
| 96 } | |
| 97 | |
| 98 void DisplayItemTransformTreeBuilder::finishRange() | |
| 99 { | |
| 100 // Don't emit an empty range record. | |
| 101 if (m_rangeBeginIndex != m_currentIndex) { | |
| 102 const auto& current = currentTransformNodeData(); | |
| 103 m_transformTree->appendRangeRecord(m_rangeBeginIndex, m_currentIndex, cu
rrent.transformNode, current.offset); | |
| 104 } | |
| 105 | |
| 106 // The current display item is a boundary. | |
| 107 // The earliest the next range could begin is the next one. | |
| 108 m_rangeBeginIndex = m_currentIndex + 1; | |
| 109 } | |
| 110 | |
| 111 } // namespace blink | |
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Chromium Code Reviews
Issue 1296963002:
Put transform tree building in DisplayItemPropertyTreeBuilder. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk