1 files changed, 177 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/LayoutState.cpp b/Source/WebCore/rendering/LayoutState.cpp
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--- /dev/null
+++ b/Source/WebCore/rendering/LayoutState.cpp
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2007 Apple Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "LayoutState.h"
+
+#include "ColumnInfo.h"
+#include "RenderArena.h"
+#include "RenderInline.h"
+#include "RenderLayer.h"
+#include "RenderView.h"
+
+namespace WebCore {
+
+LayoutState::LayoutState(LayoutState* prev, RenderBox* renderer, const IntSize& offset, int pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo)
+    : m_columnInfo(columnInfo)
+    , m_next(prev)
+#ifndef NDEBUG
+    , m_renderer(renderer)
+#endif
+{
+    ASSERT(m_next);
+
+    bool fixed = renderer->isPositioned() && renderer->style()->position() == FixedPosition;
+    if (fixed) {
+        // FIXME: This doesn't work correctly with transforms.
+        FloatPoint fixedOffset = renderer->view()->localToAbsolute(FloatPoint(), true);
+        m_paintOffset = IntSize(fixedOffset.x(), fixedOffset.y()) + offset;
+    } else
+        m_paintOffset = prev->m_paintOffset + offset;
+
+    if (renderer->isPositioned() && !fixed) {
+        if (RenderObject* container = renderer->container()) {
+            if (container->isRelPositioned() && container->isRenderInline())
+                m_paintOffset += toRenderInline(container)->relativePositionedInlineOffset(renderer);
+        }
+    }
+
+    m_layoutOffset = m_paintOffset;
+
+    if (renderer->isRelPositioned() && renderer->hasLayer())
+        m_paintOffset += renderer->layer()->relativePositionOffset();
+
+    m_clipped = !fixed && prev->m_clipped;
+    if (m_clipped)
+        m_clipRect = prev->m_clipRect;
+
+    if (renderer->hasOverflowClip()) {
+        RenderLayer* layer = renderer->layer();
+        IntRect clipRect(toPoint(m_paintOffset) + renderer->view()->layoutDelta(), layer->size());
+        if (m_clipped)
+            m_clipRect.intersect(clipRect);
+        else {
+            m_clipRect = clipRect;
+            m_clipped = true;
+        }
+
+        m_paintOffset -= layer->scrolledContentOffset();
+    }
+
+    // If we establish a new page height, then cache the offset to the top of the first page.
+    // We can compare this later on to figure out what part of the page we're actually on,
+    if (pageLogicalHeight || m_columnInfo) {
+        m_pageLogicalHeight = pageLogicalHeight;
+        m_pageOffset = IntSize(m_layoutOffset.width() + renderer->borderLeft() + renderer->paddingLeft(),
+                               m_layoutOffset.height() + renderer->borderTop() + renderer->paddingTop());
+        m_pageLogicalHeightChanged = pageLogicalHeightChanged;
+    } else {
+        // If we don't establish a new page height, then propagate the old page height and offset down.
+        m_pageLogicalHeight = m_next->m_pageLogicalHeight;
+        m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
+        m_pageOffset = m_next->m_pageOffset;
+        
+        // Disable pagination for objects we don't support.  For now this includes overflow:scroll/auto and inline blocks.
+        if (renderer->isReplaced() || renderer->scrollsOverflow())
+            m_pageLogicalHeight = 0;
+    }
+    
+    if (!m_columnInfo)
+        m_columnInfo = m_next->m_columnInfo;
+
+    m_layoutDelta = m_next->m_layoutDelta;
+    
+    // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
+}
+
+LayoutState::LayoutState(RenderObject* root)
+    : m_clipped(false)
+    , m_pageLogicalHeight(0)
+    , m_pageLogicalHeightChanged(false)
+    , m_columnInfo(0)
+    , m_next(0)
+#ifndef NDEBUG
+    , m_renderer(root)
+#endif
+{
+    RenderObject* container = root->container();
+    FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
+    m_paintOffset = IntSize(absContentPoint.x(), absContentPoint.y());
+
+    if (container->hasOverflowClip()) {
+        RenderLayer* layer = toRenderBoxModelObject(container)->layer();
+        m_clipped = true;
+        m_clipRect = IntRect(toPoint(m_paintOffset), layer->size());
+        m_paintOffset -= layer->scrolledContentOffset();
+    }
+}
+
+#ifndef NDEBUG
+static bool inLayoutStateDestroy;
+#endif
+
+void LayoutState::destroy(RenderArena* renderArena)
+{
+#ifndef NDEBUG
+    inLayoutStateDestroy = true;
+#endif
+    delete this;
+#ifndef NDEBUG
+    inLayoutStateDestroy = false;
+#endif
+    renderArena->free(*(size_t*)this, this);
+}
+
+void* LayoutState::operator new(size_t sz, RenderArena* renderArena) throw()
+{
+    return renderArena->allocate(sz);
+}
+
+void LayoutState::operator delete(void* ptr, size_t sz)
+{
+    ASSERT(inLayoutStateDestroy);
+    *(size_t*)ptr = sz;
+}
+
+void LayoutState::clearPaginationInformation()
+{
+    m_pageLogicalHeight = m_next->m_pageLogicalHeight;
+    m_pageOffset = m_next->m_pageOffset;
+    m_columnInfo = m_next->m_columnInfo;
+}
+
+int LayoutState::pageLogicalOffset(int childLogicalOffset) const
+{
+    return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height();
+}
+
+void LayoutState::addForcedColumnBreak(int childY)
+{
+    if (!m_columnInfo || m_columnInfo->columnHeight())
+        return;
+    m_columnInfo->addForcedBreak(pageLogicalOffset(childY));
+}
+
+} // namespace WebCore