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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 DrawLooper_h
     32 #define DrawLooper_h
     33 
     34 #include "platform/PlatformExport.h"
     35 #include "wtf/Noncopyable.h"
     36 #include "wtf/RefPtr.h"
     37 
     38 class SkDrawLooper;
     39 class SkLayerDrawLooper;
     40 
     41 namespace WebCore {
     42 
     43 class Color;
     44 class FloatSize;
     45 
     46 class PLATFORM_EXPORT DrawLooper {
     47     // Implementing the copy constructor properly would require writing code to
     48     // copy the underlying SkDrawLooper.
     49     WTF_MAKE_NONCOPYABLE(DrawLooper);
     50 
     51 public:
     52     enum ShadowTransformMode {
     53         ShadowRespectsTransforms,
     54         ShadowIgnoresTransforms
     55     };
     56     enum ShadowAlphaMode {
     57         ShadowRespectsAlpha,
     58         ShadowIgnoresAlpha
     59     };
     60 
     61     DrawLooper();
     62     ~DrawLooper();
     63 
     64     // Callees should not modify this looper other than to iterate over it.
     65     // A downcast to SkLayerDrawLooper* is tantamount to a const_cast.
     66     SkDrawLooper* skDrawLooper() const;
     67 
     68     void addUnmodifiedContent();
     69     void addShadow(const FloatSize& offset, float blur, const Color&,
     70         ShadowTransformMode = ShadowRespectsTransforms,
     71         ShadowAlphaMode = ShadowRespectsAlpha);
     72 
     73 private:
     74     RefPtr<SkLayerDrawLooper> m_skDrawLooper;
     75 };
     76 
     77 } // namespace WebCore
     78 
     79 #endif // DrawLooper_h
     80