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      1 /*
      2  * Copyright (C) 2000 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2000 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2000 Dirk Mueller (mueller (at) kde.org)
      5  *           (C) 2004 Allan Sandfeld Jensen (kde (at) carewolf.com)
      6  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
      7  * Copyright (C) 2009 Google Inc. All rights reserved.
      8  *
      9  * This library is free software; you can redistribute it and/or
     10  * modify it under the terms of the GNU Library General Public
     11  * License as published by the Free Software Foundation; either
     12  * version 2 of the License, or (at your option) any later version.
     13  *
     14  * This library is distributed in the hope that it will be useful,
     15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     17  * Library General Public License for more details.
     18  *
     19  * You should have received a copy of the GNU Library General Public License
     20  * along with this library; see the file COPYING.LIB.  If not, write to
     21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     22  * Boston, MA 02110-1301, USA.
     23  *
     24  */
     25 
     26 #ifndef PaintInfo_h
     27 #define PaintInfo_h
     28 
     29 #include <limits>
     30 #include "core/rendering/PaintPhase.h"
     31 #include "platform/geometry/IntRect.h"
     32 #include "platform/geometry/LayoutRect.h"
     33 #include "platform/graphics/GraphicsContext.h"
     34 #include "platform/graphics/GraphicsContextStateSaver.h"
     35 #include "platform/transforms/AffineTransform.h"
     36 #include "wtf/HashMap.h"
     37 #include "wtf/ListHashSet.h"
     38 
     39 namespace blink {
     40 
     41 class RenderInline;
     42 class RenderLayerModelObject;
     43 class RenderObject;
     44 class RenderWidget;
     45 
     46 typedef HashMap<RenderWidget*, IntRect> OverlapTestRequestMap;
     47 
     48 /*
     49  * Paint the object and its children, clipped by (x|y|w|h).
     50  * (tx|ty) is the calculated position of the parent
     51  */
     52 struct PaintInfo {
     53     PaintInfo(GraphicsContext* newContext, const IntRect& newRect, PaintPhase newPhase, PaintBehavior newPaintBehavior,
     54         RenderObject* newPaintingRoot = 0, ListHashSet<RenderInline*>* newOutlineObjects = 0,
     55         const RenderLayerModelObject* newPaintContainer = 0)
     56         : context(newContext)
     57         , rect(newRect)
     58         , phase(newPhase)
     59         , paintBehavior(newPaintBehavior)
     60         , paintingRoot(newPaintingRoot)
     61         , m_paintContainer(newPaintContainer)
     62         , m_outlineObjects(newOutlineObjects)
     63     {
     64     }
     65 
     66     void updatePaintingRootForChildren(const RenderObject* renderer)
     67     {
     68         if (!paintingRoot)
     69             return;
     70 
     71         // If we're the painting root, kids draw normally, and see root of 0.
     72         if (paintingRoot == renderer) {
     73             paintingRoot = 0;
     74             return;
     75         }
     76     }
     77 
     78     bool shouldPaintWithinRoot(const RenderObject* renderer) const
     79     {
     80         return !paintingRoot || paintingRoot == renderer;
     81     }
     82 
     83     bool forceBlackText() const { return paintBehavior & PaintBehaviorForceBlackText; }
     84 
     85     bool skipRootBackground() const { return paintBehavior & PaintBehaviorSkipRootBackground; }
     86     bool paintRootBackgroundOnly() const { return paintBehavior & PaintBehaviorRootBackgroundOnly; }
     87 
     88     void applyTransform(const AffineTransform& localToAncestorTransform,
     89         GraphicsContextStateSaver* stateSaver = 0)
     90     {
     91         if (localToAncestorTransform.isIdentity())
     92             return;
     93 
     94         if (stateSaver)
     95             stateSaver->saveIfNeeded();
     96 
     97         context->concatCTM(localToAncestorTransform);
     98 
     99         if (rect == infiniteRect())
    100             return;
    101 
    102         if (localToAncestorTransform.isInvertible())
    103             rect = localToAncestorTransform.inverse().mapRect(rect);
    104         else
    105             rect.setSize(IntSize(0, 0));
    106     }
    107 
    108     static IntRect infiniteRect() { return IntRect(LayoutRect::infiniteRect()); }
    109     const RenderLayerModelObject* paintContainer() const { return m_paintContainer; }
    110 
    111     ListHashSet<RenderInline*>* outlineObjects() { return m_outlineObjects; }
    112     void setOutlineObjects(ListHashSet<RenderInline*>* objects) { m_outlineObjects = objects; }
    113 
    114     // FIXME: Introduce setters/getters at some point. Requires a lot of changes throughout rendering/.
    115     GraphicsContext* context;
    116     IntRect rect;
    117     PaintPhase phase;
    118     PaintBehavior paintBehavior;
    119     RenderObject* paintingRoot; // used to draw just one element and its visual kids
    120 
    121 private:
    122     const RenderLayerModelObject* m_paintContainer; // the layer object that originates the current painting
    123     ListHashSet<RenderInline*>* m_outlineObjects; // used to list outlines that should be painted by a block with inline children
    124 };
    125 
    126 } // namespace blink
    127 
    128 #endif // PaintInfo_h
    129