Home | History | Annotate | Download | only in graphics 
      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 DrawLooperBuilder_h
     32 #define DrawLooperBuilder_h
     33 
     34 #include "platform/PlatformExport.h"
     35 #include "third_party/skia/include/effects/SkLayerDrawLooper.h"
     36 #include "wtf/Noncopyable.h"
     37 #include "wtf/PassOwnPtr.h"
     38 #include "wtf/PassRefPtr.h"
     39 
     40 class SkDrawLooper;
     41 
     42 namespace WebCore {
     43 
     44 class Color;
     45 class FloatSize;
     46 
     47 class PLATFORM_EXPORT DrawLooperBuilder FINAL {
     48     // Implementing the copy constructor properly would require writing code to
     49     // copy the underlying SkLayerDrawLooper::Builder.
     50     WTF_MAKE_NONCOPYABLE(DrawLooperBuilder);
     51 
     52 public:
     53     enum ShadowTransformMode {
     54         ShadowRespectsTransforms,
     55         ShadowIgnoresTransforms
     56     };
     57     enum ShadowAlphaMode {
     58         ShadowRespectsAlpha,
     59         ShadowIgnoresAlpha
     60     };
     61 
     62     DrawLooperBuilder();
     63     ~DrawLooperBuilder();
     64 
     65     static PassOwnPtr<DrawLooperBuilder> create();
     66 
     67     // Creates the SkDrawLooper and passes ownership to the caller. The builder
     68     // should not be used any more after calling this method.
     69     PassRefPtr<SkDrawLooper> detachDrawLooper();
     70 
     71     void addUnmodifiedContent();
     72     void addShadow(const FloatSize& offset, float blur, const Color&,
     73         ShadowTransformMode = ShadowRespectsTransforms,
     74         ShadowAlphaMode = ShadowRespectsAlpha);
     75 
     76 private:
     77     SkLayerDrawLooper::Builder m_skDrawLooperBuilder;
     78 };
     79 
     80 } // namespace WebCore
     81 
     82 #endif // DrawLooperBuilder_h
     83