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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkDrawFilter_DEFINED
#define SkDrawFilter_DEFINED
#include "SkRefCnt.h"
////////////////// EXPERIMENTAL //////////////////////////
class SkCanvas;
class SkPaint;
/** Right before something is being draw, filter() is called with the
current canvas and paint. If it returns true, then drawing proceeds
with the (possibly modified) canvas/paint, and then restore() is called
to restore the canvas/paint to their state before filter() was called.
If filter returns false, canvas/paint should not have been changed, and
restore() will not be called.
*/
class SkDrawFilter : public SkRefCnt {
public:
enum Type {
kPaint_Type,
kPoint_Type,
kLine_Type,
kBitmap_Type,
kRect_Type,
kPath_Type,
kText_Type
};
/** Return true to allow the draw to continue (with possibly modified
canvas/paint). If true is returned, then restore() will be called.
*/
virtual bool filter(SkCanvas*, SkPaint*, Type) = 0;
/** If filter() returned true, then restore() will be called to restore the
canvas/paint to their previous states
*/
virtual void restore(SkCanvas*, SkPaint*, Type) = 0;
};
#endif
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