Index: third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp |
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3aaf9f5c3d0cd9831a436309fa1768f6e7103394 |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.cpp |
@@ -0,0 +1,85 @@ |
+// 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 "core/paint/PaintInvalidationCapableScrollableArea.h" |
+ |
+#include "core/frame/Settings.h" |
+#include "core/html/HTMLFrameOwnerElement.h" |
+#include "core/layout/LayoutBox.h" |
+#include "core/layout/LayoutScrollbar.h" |
+#include "core/layout/LayoutScrollbarPart.h" |
+#include "core/layout/PaintInvalidationState.h" |
+#include "core/paint/PaintLayer.h" |
+ |
+namespace blink { |
+ |
+void PaintInvalidationCapableScrollableArea::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation) |
+{ |
+ if (!scrollbar->isCustomScrollbar() |
+ && !(orientation == HorizontalScrollbar ? layerForHorizontalScrollbar() : layerForVerticalScrollbar())) |
+ boxForScrollControlPaintInvalidation().invalidateDisplayItemClient(*scrollbar); |
+ |
+ ScrollableArea::willRemoveScrollbar(scrollbar, orientation); |
+} |
+ |
+// Returns true if the scroll control is invalidated. |
+static bool invalidatePaintOfScrollControlIfNeeded(const IntRect& scrollControlRect, LayoutRect& previousPaintInvalidationRect, bool needsPaintInvalidation, LayoutBox& box, const PaintInvalidationState& paintInvalidationState, const LayoutBoxModelObject& paintInvalidationContainer) |
+{ |
+ LayoutRect paintInvalidationRect(scrollControlRect); |
+ if (!paintInvalidationRect.isEmpty()) |
+ PaintLayer::mapRectToPaintInvalidationBacking(&box, &paintInvalidationContainer, paintInvalidationRect, &paintInvalidationState); |
+ |
+ if (paintInvalidationRect != previousPaintInvalidationRect) { |
+ box.invalidatePaintUsingContainer(paintInvalidationContainer, previousPaintInvalidationRect, PaintInvalidationScroll); |
+ previousPaintInvalidationRect = paintInvalidationRect; |
+ needsPaintInvalidation = true; |
+ } |
+ |
+ if (needsPaintInvalidation) { |
+ box.invalidatePaintUsingContainer(paintInvalidationContainer, paintInvalidationRect, PaintInvalidationScroll); |
+ return true; |
+ } |
+ |
+ return false; |
+} |
+ |
+static void invalidatePaintOfScrollbarIfNeeded(Scrollbar* scrollbar, GraphicsLayer* scrollbarGraphicsLayer, LayoutRect& previousPaintInvalidationRect, bool needsPaintInvalidation, LayoutBox& box, const PaintInvalidationState& paintInvalidationState, const LayoutBoxModelObject& paintInvalidationContainer) |
+{ |
+ IntRect scrollbarRect = scrollbar && !scrollbarGraphicsLayer ? scrollbar->frameRect() : IntRect(); |
+ if (!invalidatePaintOfScrollControlIfNeeded(scrollbarRect, previousPaintInvalidationRect, needsPaintInvalidation, box, paintInvalidationState, paintInvalidationContainer)) |
+ return; |
+ if (!scrollbar) |
+ return; |
+ |
+ paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*scrollbar, PaintInvalidationScroll, &previousPaintInvalidationRect); |
+ if (scrollbar->isCustomScrollbar()) |
+ toLayoutScrollbar(scrollbar)->invalidateDisplayItemClientsOfScrollbarParts(paintInvalidationContainer, previousPaintInvalidationRect); |
+} |
+ |
+void PaintInvalidationCapableScrollableArea::invalidatePaintOfScrollControlsIfNeeded(const PaintInvalidationState& paintInvalidationState, const LayoutBoxModelObject& paintInvalidationContainer) |
+{ |
+ LayoutBox& box = boxForScrollControlPaintInvalidation(); |
+ LayoutRect oldRect = m_horizontalScrollbarPreviousPaintInvalidationRect; |
+ invalidatePaintOfScrollbarIfNeeded(horizontalScrollbar(), layerForHorizontalScrollbar(), m_horizontalScrollbarPreviousPaintInvalidationRect, horizontalScrollbarNeedsPaintInvalidation(), box, paintInvalidationState, paintInvalidationContainer); |
+ bool scrollbarGeometryChanged = oldRect != m_horizontalScrollbarPreviousPaintInvalidationRect; |
+ |
+ oldRect = m_verticalScrollbarPreviousPaintInvalidationRect; |
+ invalidatePaintOfScrollbarIfNeeded(verticalScrollbar(), layerForVerticalScrollbar(), m_verticalScrollbarPreviousPaintInvalidationRect, verticalScrollbarNeedsPaintInvalidation(), box, paintInvalidationState, paintInvalidationContainer); |
+ scrollbarGeometryChanged |= oldRect != m_verticalScrollbarPreviousPaintInvalidationRect; |
+ |
+ if (scrollbarGeometryChanged) |
+ paintInvalidationContainer.invalidateDisplayItemClientOnBacking(box, PaintInvalidationScroll, nullptr); |
+ |
+ if (invalidatePaintOfScrollControlIfNeeded(scrollCornerRect(), m_scrollCornerPreviousPaintInvalidationRect, scrollCornerNeedsPaintInvalidation(), box, paintInvalidationState, paintInvalidationContainer)) { |
+ if (LayoutScrollbarPart* scrollCorner = this->scrollCorner()) |
+ scrollCorner->invalidateDisplayItemClientsIncludingNonCompositingDescendants(&paintInvalidationContainer, PaintInvalidationScroll, &m_scrollCornerPreviousPaintInvalidationRect); |
+ if (LayoutScrollbarPart* resizer = this->resizer()) |
+ resizer->invalidateDisplayItemClientsIncludingNonCompositingDescendants(&paintInvalidationContainer, PaintInvalidationScroll, &m_scrollCornerPreviousPaintInvalidationRect); |
+ } |
+ |
+ clearNeedsPaintInvalidationForScrollControls(); |
+} |
+ |
+} // namespace blink |