1 /*
2 * Copyright (C) 2007 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "LayoutState.h"
28
29 #include "ColumnInfo.h"
30 #include "RenderArena.h"
31 #include "RenderInline.h"
32 #include "RenderLayer.h"
33 #include "RenderView.h"
34
35 namespace WebCore {
36
LayoutState(LayoutState * prev,RenderBox * renderer,const IntSize & offset,int pageLogicalHeight,bool pageLogicalHeightChanged,ColumnInfo * columnInfo)37 LayoutState::LayoutState(LayoutState* prev, RenderBox* renderer, const IntSize& offset, int pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo)
38 : m_columnInfo(columnInfo)
39 , m_next(prev)
40 #ifndef NDEBUG
41 , m_renderer(renderer)
42 #endif
43 {
44 ASSERT(m_next);
45
46 bool fixed = renderer->isPositioned() && renderer->style()->position() == FixedPosition;
47 if (fixed) {
48 // FIXME: This doesn't work correctly with transforms.
49 FloatPoint fixedOffset = renderer->view()->localToAbsolute(FloatPoint(), true);
50 m_paintOffset = IntSize(fixedOffset.x(), fixedOffset.y()) + offset;
51 } else
52 m_paintOffset = prev->m_paintOffset + offset;
53
54 if (renderer->isPositioned() && !fixed) {
55 if (RenderObject* container = renderer->container()) {
56 if (container->isRelPositioned() && container->isRenderInline())
57 m_paintOffset += toRenderInline(container)->relativePositionedInlineOffset(renderer);
58 }
59 }
60
61 m_layoutOffset = m_paintOffset;
62
63 if (renderer->isRelPositioned() && renderer->hasLayer())
64 m_paintOffset += renderer->layer()->relativePositionOffset();
65
66 m_clipped = !fixed && prev->m_clipped;
67 if (m_clipped)
68 m_clipRect = prev->m_clipRect;
69
70 if (renderer->hasOverflowClip()) {
71 RenderLayer* layer = renderer->layer();
72 IntRect clipRect(toPoint(m_paintOffset) + renderer->view()->layoutDelta(), layer->size());
73 if (m_clipped)
74 m_clipRect.intersect(clipRect);
75 else {
76 m_clipRect = clipRect;
77 m_clipped = true;
78 }
79
80 m_paintOffset -= layer->scrolledContentOffset();
81 }
82
83 // If we establish a new page height, then cache the offset to the top of the first page.
84 // We can compare this later on to figure out what part of the page we're actually on,
85 if (pageLogicalHeight || m_columnInfo) {
86 m_pageLogicalHeight = pageLogicalHeight;
87 m_pageOffset = IntSize(m_layoutOffset.width() + renderer->borderLeft() + renderer->paddingLeft(),
88 m_layoutOffset.height() + renderer->borderTop() + renderer->paddingTop());
89 m_pageLogicalHeightChanged = pageLogicalHeightChanged;
90 } else {
91 // If we don't establish a new page height, then propagate the old page height and offset down.
92 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
93 m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
94 m_pageOffset = m_next->m_pageOffset;
95
96 // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto and inline blocks.
97 if (renderer->isReplaced() || renderer->scrollsOverflow())
98 m_pageLogicalHeight = 0;
99 }
100
101 if (!m_columnInfo)
102 m_columnInfo = m_next->m_columnInfo;
103
104 m_layoutDelta = m_next->m_layoutDelta;
105
106 // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
107 }
108
LayoutState(RenderObject * root)109 LayoutState::LayoutState(RenderObject* root)
110 : m_clipped(false)
111 , m_pageLogicalHeight(0)
112 , m_pageLogicalHeightChanged(false)
113 , m_columnInfo(0)
114 , m_next(0)
115 #ifndef NDEBUG
116 , m_renderer(root)
117 #endif
118 {
119 RenderObject* container = root->container();
120 FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
121 m_paintOffset = IntSize(absContentPoint.x(), absContentPoint.y());
122
123 if (container->hasOverflowClip()) {
124 RenderLayer* layer = toRenderBoxModelObject(container)->layer();
125 m_clipped = true;
126 m_clipRect = IntRect(toPoint(m_paintOffset), layer->size());
127 m_paintOffset -= layer->scrolledContentOffset();
128 }
129 }
130
131 #ifndef NDEBUG
132 static bool inLayoutStateDestroy;
133 #endif
134
destroy(RenderArena * renderArena)135 void LayoutState::destroy(RenderArena* renderArena)
136 {
137 #ifndef NDEBUG
138 inLayoutStateDestroy = true;
139 #endif
140 delete this;
141 #ifndef NDEBUG
142 inLayoutStateDestroy = false;
143 #endif
144 renderArena->free(*(size_t*)this, this);
145 }
146
operator new(size_t sz,RenderArena * renderArena)147 void* LayoutState::operator new(size_t sz, RenderArena* renderArena) throw()
148 {
149 return renderArena->allocate(sz);
150 }
151
operator delete(void * ptr,size_t sz)152 void LayoutState::operator delete(void* ptr, size_t sz)
153 {
154 ASSERT(inLayoutStateDestroy);
155 *(size_t*)ptr = sz;
156 }
157
clearPaginationInformation()158 void LayoutState::clearPaginationInformation()
159 {
160 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
161 m_pageOffset = m_next->m_pageOffset;
162 m_columnInfo = m_next->m_columnInfo;
163 }
164
pageLogicalOffset(int childLogicalOffset) const165 int LayoutState::pageLogicalOffset(int childLogicalOffset) const
166 {
167 return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height();
168 }
169
addForcedColumnBreak(int childLogicalOffset)170 void LayoutState::addForcedColumnBreak(int childLogicalOffset)
171 {
172 if (!m_columnInfo || m_columnInfo->columnHeight())
173 return;
174 m_columnInfo->addForcedBreak(pageLogicalOffset(childLogicalOffset));
175 }
176
177 } // namespace WebCore
178