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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 WebContentLayerClient_h
27 #define WebContentLayerClient_h
28 
29 #include "WebCanvas.h"
30 #include "WebCommon.h"
31 
32 namespace blink {
33 struct WebRect;
34 struct WebFloatRect;
35 
36 class BLINK_PLATFORM_EXPORT WebContentLayerClient {
37 public:
38     // Paints the content area for the layer, typically dirty rects submitted
39     // through WebContentLayer::setNeedsDisplay, submitting drawing commands
40     // through the WebCanvas.
41     // The canvas is already clipped to the |clip| rect.
42     // Optionally, the implementation may set |opaque| to a rect covering pixels that
43     // the implementation knows are opaque. This information can be used for various
44     // optimizations.
45     virtual void paintContents(WebCanvas*, const WebRect& clip, bool canPaintLCDText, WebFloatRect& opaque) = 0;
46 
47 protected:
~WebContentLayerClient()48     virtual ~WebContentLayerClient() { }
49 };
50 
51 } // namespace blink
52 
53 #endif // WebContentLayerClient_h
54