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      1 /*
      2  * Copyright (C) 2013 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ShadowList_h
     32 #define ShadowList_h
     33 
     34 #include "core/rendering/style/ShadowData.h"
     35 #include "platform/geometry/LayoutRect.h"
     36 #include "platform/graphics/DrawLooperBuilder.h"
     37 #include "wtf/PassOwnPtr.h"
     38 #include "wtf/RefCounted.h"
     39 #include "wtf/Vector.h"
     40 
     41 namespace blink {
     42 
     43 class FloatRect;
     44 class LayoutRect;
     45 
     46 typedef Vector<ShadowData, 1> ShadowDataVector;
     47 
     48 // These are used to store shadows in specified order, but we usually want to
     49 // iterate over them backwards as the first-specified shadow is painted on top.
     50 class ShadowList : public RefCounted<ShadowList> {
     51 public:
     52     // This consumes passed in vector.
     53     static PassRefPtr<ShadowList> adopt(ShadowDataVector& shadows)
     54     {
     55         return adoptRef(new ShadowList(shadows));
     56     }
     57     const ShadowDataVector& shadows() const { return m_shadows; }
     58     bool operator==(const ShadowList& o) const { return m_shadows == o.m_shadows; }
     59     bool operator!=(const ShadowList& o) const { return !(*this == o); }
     60 
     61     static PassRefPtr<ShadowList> blend(const ShadowList* from, const ShadowList* to, double progress);
     62 
     63     void adjustRectForShadow(LayoutRect&) const;
     64     void adjustRectForShadow(FloatRect&) const;
     65 
     66     PassOwnPtr<DrawLooperBuilder> createDrawLooper(DrawLooperBuilder::ShadowAlphaMode, bool isHorizontal = true) const;
     67 
     68 private:
     69     ShadowList(ShadowDataVector& shadows)
     70     {
     71         // If we have no shadows, we use a null ShadowList
     72         ASSERT(!shadows.isEmpty());
     73         m_shadows.swap(shadows);
     74         m_shadows.shrinkToFit();
     75     }
     76     ShadowDataVector m_shadows;
     77 };
     78 
     79 } // namespace blink
     80 
     81 #endif // ShadowList_h
     82