Use float for scroll offset.

third_party/WebKit/Source/core/layout/LayoutBoxModelObjectTest.cpp

 // Copyright 2016 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 "core/layout/LayoutBoxModelObject.h"
 
 #include "core/html/HTMLElement.h"
 #include "core/layout/ImageQualityController.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/page/scrolling/StickyPositionScrollingConstraints.h"
@@ skipping 24 matching lines @@
       "#container { box-sizing: border-box; position: relative; top: 100px; "
       "height: 400px; width: 200px; padding: 10px; border: 5px solid black; }"
       "#scroller { height: 100px; overflow: auto; position: relative; top: "
       "200px; }"
       ".spacer { height: 1000px; }</style>"
       "<div id='scroller'><div id='container'><div "
       "id='sticky'></div></div><div class='spacer'></div></div>");
   LayoutBoxModelObject* scroller =
       toLayoutBoxModelObject(getLayoutObjectByElementId("scroller"));
   PaintLayerScrollableArea* scrollableArea = scroller->getScrollableArea();
-  scrollableArea->scrollToOffsetFromOrigin(
-      DoubleSize(scrollableArea->offsetFromOrigin().width(), 50));
-  ASSERT_EQ(50.0, scrollableArea->offsetFromOrigin().height());
+  scrollableArea->scrollToAbsolutePosition(
+      FloatPoint(scrollableArea->scrollOffsetInt().width(), 50));
+  ASSERT_EQ(50.0, scrollableArea->absolutePosition().y());
   LayoutBoxModelObject* sticky =
       toLayoutBoxModelObject(getLayoutObjectByElementId("sticky"));
   sticky->updateStickyPositionConstraints();
   ASSERT_EQ(scroller->layer(), sticky->layer()->ancestorOverflowLayer());
 
   const StickyPositionScrollingConstraints& constraints =
       scrollableArea->stickyConstraintsMap().get(sticky->layer());
   ASSERT_EQ(0.f, constraints.topOffset());
 
   // The coordinates of the constraint rects should all be with respect to the unscrolled scroller.
@@ skipping 13 matching lines @@
       "#container { box-sizing: border-box; position: relative; top: 100px; "
       "height: 400px; width: 200px; padding: 10px; border: 5px solid black; "
       "transform: scale(2); transform-origin: top left; }"
       "#scroller { height: 100px; overflow: auto; position: relative; top: "
       "200px; }"
       ".spacer { height: 1000px; }</style>"
       "<div id='scroller'><div id='container'><div "
       "id='sticky'></div></div><div class='spacer'></div></div>");
   LayoutBoxModelObject* scroller =
       toLayoutBoxModelObject(getLayoutObjectByElementId("scroller"));
-  DoubleSize newOffset(
-      scroller->getScrollableArea()->offsetFromOrigin().width(), 50);
-  scroller->getScrollableArea()->scrollToOffsetFromOrigin(newOffset);
-  ASSERT_EQ(50.0, scroller->getScrollableArea()->offsetFromOrigin().height());
+  PaintLayerScrollableArea* scrollableArea = scroller->getScrollableArea();
+  scrollableArea->scrollToAbsolutePosition(
+      FloatPoint(scrollableArea->scrollOffsetInt().width(), 50));
+  ASSERT_EQ(50.0, scrollableArea->absolutePosition().y());
   LayoutBoxModelObject* sticky =
       toLayoutBoxModelObject(getLayoutObjectByElementId("sticky"));
   sticky->updateStickyPositionConstraints();
   ASSERT_EQ(scroller->layer(), sticky->layer()->ancestorOverflowLayer());
 
   const StickyPositionScrollingConstraints& constraints =
       scroller->getScrollableArea()->stickyConstraintsMap().get(
           sticky->layer());
   ASSERT_EQ(0.f, constraints.topOffset());
 
@@ skipping 14 matching lines @@
       "#container { box-sizing: border-box; position: relative; top: 100px; "
       "height: 400px; width: 250px; padding: 5%; border: 5px solid black; }"
       "#scroller { width: 400px; height: 100px; overflow: auto; position: "
       "relative; top: 200px; }"
       ".spacer { height: 1000px; }</style>"
       "<div id='scroller'><div id='container'><div "
       "id='sticky'></div></div><div class='spacer'></div></div>");
   LayoutBoxModelObject* scroller =
       toLayoutBoxModelObject(getLayoutObjectByElementId("scroller"));
   PaintLayerScrollableArea* scrollableArea = scroller->getScrollableArea();
-  scrollableArea->scrollToOffsetFromOrigin(
-      DoubleSize(scrollableArea->offsetFromOrigin().width(), 50));
-  ASSERT_EQ(50.0, scrollableArea->offsetFromOrigin().height());
+  scrollableArea->scrollToAbsolutePosition(
+      FloatPoint(scrollableArea->absolutePosition().x(), 50));
+  ASSERT_EQ(50.0, scrollableArea->absolutePosition().y());
   LayoutBoxModelObject* sticky =
       toLayoutBoxModelObject(getLayoutObjectByElementId("sticky"));
   sticky->updateStickyPositionConstraints();
   ASSERT_EQ(scroller->layer(), sticky->layer()->ancestorOverflowLayer());
 
   const StickyPositionScrollingConstraints& constraints =
       scrollableArea->stickyConstraintsMap().get(sticky->layer());
   ASSERT_EQ(0.f, constraints.topOffset());
 
   ASSERT_EQ(IntRect(25, 145, 200, 330),
@@ skipping 11 matching lines @@
       "<style>#sticky { position: sticky; top: 0; width: 100px; height: 100px; "
       "}"
       "#scroller { height: 100px; width: 400px; overflow: auto; position: "
       "relative; top: 200px; }"
       ".spacer { height: 1000px; }</style>"
       "<div id='scroller'><div id='sticky'></div><div "
       "class='spacer'></div></div>");
   LayoutBoxModelObject* scroller =
       toLayoutBoxModelObject(getLayoutObjectByElementId("scroller"));
   PaintLayerScrollableArea* scrollableArea = scroller->getScrollableArea();
-  scrollableArea->scrollToOffsetFromOrigin(
-      DoubleSize(scrollableArea->offsetFromOrigin().width(), 50));
-  ASSERT_EQ(50.0, scrollableArea->offsetFromOrigin().height());
+  scrollableArea->scrollToAbsolutePosition(
+      FloatPoint(scrollableArea->absolutePosition().x(), 50));
+  ASSERT_EQ(50.0, scrollableArea->absolutePosition().y());
   LayoutBoxModelObject* sticky =
       toLayoutBoxModelObject(getLayoutObjectByElementId("sticky"));
   sticky->updateStickyPositionConstraints();
   ASSERT_EQ(scroller->layer(), sticky->layer()->ancestorOverflowLayer());
 
   const StickyPositionScrollingConstraints& constraints =
       scrollableArea->stickyConstraintsMap().get(sticky->layer());
   ASSERT_EQ(IntRect(0, 0, 400, 1100),
             enclosingIntRect(
                 getScrollContainerRelativeContainingBlockRect(constraints)));
@@ skipping 12 matching lines @@
       "height: 400px; width: 200px; padding: 10px; border: 5px solid black; }"
       "#scroller { height: 100px; overflow: auto; position: relative; top: "
       "200px; }"
       ".header { height: 50px; }"
       ".spacer { height: 1000px; }</style>"
       "<div id='scroller'><div id='container'><div class='header'></div><div "
       "id='sticky'></div></div><div class='spacer'></div></div>");
   LayoutBoxModelObject* scroller =
       toLayoutBoxModelObject(getLayoutObjectByElementId("scroller"));
   PaintLayerScrollableArea* scrollableArea = scroller->getScrollableArea();
-  scrollableArea->scrollToOffsetFromOrigin(
-      DoubleSize(scrollableArea->offsetFromOrigin().width(), 50));
-  ASSERT_EQ(50.0, scrollableArea->offsetFromOrigin().height());
+  scrollableArea->scrollToAbsolutePosition(
+      FloatPoint(scrollableArea->absolutePosition().x(), 50));
+  ASSERT_EQ(50.0, scrollableArea->absolutePosition().y());
   LayoutBoxModelObject* sticky =
       toLayoutBoxModelObject(getLayoutObjectByElementId("sticky"));
   sticky->updateStickyPositionConstraints();
   ASSERT_EQ(scroller->layer(), sticky->layer()->ancestorOverflowLayer());
 
   const StickyPositionScrollingConstraints& constraints =
       scrollableArea->stickyConstraintsMap().get(sticky->layer());
   ASSERT_EQ(IntRect(15, 115, 170, 370),
             enclosingIntRect(
                 getScrollContainerRelativeContainingBlockRect(constraints)));
   ASSERT_EQ(
       IntRect(15, 165, 100, 100),
       enclosingIntRect(getScrollContainerRelativeStickyBoxRect(constraints)));
 }
 }  // namespace blink