[LayoutNG] Very simple layout() implementation

third_party/WebKit/Source/core/layout/ng/NGBlockLayoutAlgorithm.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/ng/NGBlockLayoutAlgorithm.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/layout/ng/NGConstraintSpace.h"
+#include "core/layout/ng/NGFragment.h"
 #include "core/style/ComputedStyle.h"
+#include "platform/LengthFunctions.h"
 
 namespace blink {
 
-NGBlockLayoutAlgorithm::NGBlockLayoutAlgorithm()
+NGBlockLayoutAlgorithm::NGBlockLayoutAlgorithm(ComputedStyle* style)
+    : m_style(style)
 {
 }
 
+NGFragment* NGBlockLayoutAlgorithm::layout(
+    const NGConstraintSpace& constraintSpace)
+{
+    LayoutUnit inlineSize = valueForLength(m_style->logicalWidth(),
+        constraintSpace.inlineContainerSize());
+    LayoutUnit blockSize = valueForLength(m_style->logicalHeight(),
+        constraintSpace.blockContainerSize());
+    return new NGFragment(inlineSize, blockSize);
+}
+
 NGConstraintSpace NGBlockLayoutAlgorithm::createConstraintSpaceFromLayoutObject(const LayoutBox& child)
 {
     bool fixedInline = false, fixedBlock = false;
     // XXX for orthogonal writing mode this is not right
     LayoutUnit containerLogicalWidth = std::max(LayoutUnit(), child.containingBlockLogicalWidthForContent());
     // XXX Make sure this height is correct
     LayoutUnit containerLogicalHeight = child.containingBlockLogicalHeightForContent(ExcludeMarginBorderPadding);
     if (child.hasOverrideLogicalContentWidth()) {
         containerLogicalWidth = child.overrideLogicalContentWidth();
         fixedInline = true;
     }
     if (child.hasOverrideLogicalContentHeight()) {
         containerLogicalWidth = child.overrideLogicalContentHeight();
         fixedBlock = true;
     }
     NGConstraintSpace space(containerLogicalWidth, containerLogicalHeight);
     // XXX vertical writing mode
     space.setOverflowTriggersScrollbar(child.styleRef().overflowX() == OverflowAuto,
         child.styleRef().overflowY() == OverflowAuto);
     space.setFixedSize(fixedInline, fixedBlock);
     return space;
 }
 
 } // namespace blink