third_party/WebKit/Source/platform/graphics/DrawLooperBuilder.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef DrawLooperBuilder_h
#define DrawLooperBuilder_h

#include <memory>
#include "platform/PlatformExport.h"
#include "platform/wtf/Allocator.h"
#include "platform/wtf/Noncopyable.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/effects/SkLayerDrawLooper.h"

class SkDrawLooper;

namespace blink {

class Color;
class FloatSize;

class PLATFORM_EXPORT DrawLooperBuilder final {
  // Implementing the copy constructor properly would require writing code to
  // copy the underlying SkLayerDrawLooper::Builder.
  WTF_MAKE_NONCOPYABLE(DrawLooperBuilder);
  STACK_ALLOCATED();

 public:
  enum ShadowTransformMode {
    kShadowRespectsTransforms,
    kShadowIgnoresTransforms
  };
  enum ShadowAlphaMode { kShadowRespectsAlpha, kShadowIgnoresAlpha };

  DrawLooperBuilder();
  ~DrawLooperBuilder();

  // Creates the SkDrawLooper and passes ownership to the caller. The builder
  // should not be used any more after calling this method.
  sk_sp<SkDrawLooper> DetachDrawLooper();

  void AddUnmodifiedContent();
  void AddShadow(const FloatSize& offset,
                 float blur,
                 const Color&,
                 ShadowTransformMode = kShadowRespectsTransforms,
                 ShadowAlphaMode = kShadowRespectsAlpha);

 private:
  SkLayerDrawLooper::Builder sk_draw_looper_builder_;
};

}  // namespace blink

#endif  // DrawLooperBuilder_h