third_party/WebKit/public/platform/WebExternalTextureLayer.h

   1 /*
   2  * Copyright (C) 2011 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
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef WebExternalTextureLayer_h
  27 #define WebExternalTextureLayer_h
  28
  29 #include "WebCommon.h"
  30 #include "WebFloatRect.h"
  31 #include "WebLayer.h"
  32
  33 namespace blink {
  34
  35 // This class represents a layer that renders a texture that is generated
  36 // externally (not managed by the WebLayerTreeView).
  37 // The texture will be used by the WebLayerTreeView during compositing passes.
  38 // When in single-thread mode, this means during WebLayerTreeView::composite().
  39 // When using the threaded compositor, this can mean at an arbitrary time until
  40 // the WebLayerTreeView is destroyed.
  41 class WebExternalTextureLayer {
  42 public:
  43     virtual ~WebExternalTextureLayer() { }
  44
  45     virtual WebLayer* layer() = 0;
  46
  47     // Clears texture from the layer.
  48     virtual void clearTexture() = 0;
  49
  50     // Sets whether every pixel in this layer is opaque. Defaults to false.
  51     virtual void setOpaque(bool) = 0;
  52
  53     // Sets whether this layer's texture has premultiplied alpha or not. Defaults to true.
  54     virtual void setPremultipliedAlpha(bool) = 0;
  55
  56     // Sets whether the texture should be blended with the background color
  57     // at draw time. Defaults to false.
  58     virtual void setBlendBackgroundColor(bool) = 0;
  59
  60     // Sets whether this texture should use nearest neighbor interpolation as
  61     // opposed to bilinear. Defaults to false.
  62     virtual void setNearestNeighbor(bool) = 0;
  63 };
  64
  65 } // namespace blink
  66
  67 #endif // WebExternalTextureLayer_h