SkOffsetImageFilter.h revision 24e06d5244ae96e440410e1d76e039983b2efac9 
1/*
2 * Copyright 2012 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkOffsetImageFilter_DEFINED
9#define SkOffsetImageFilter_DEFINED
10
11#include "SkImageFilter.h"
12#include "SkPoint.h"
13
14class SK_API SkOffsetImageFilter : public SkImageFilter {
15    typedef SkImageFilter INHERITED;
16
17public:
18    static SkOffsetImageFilter* Create(SkScalar dx, SkScalar dy, SkImageFilter* input = NULL,
19                                       const CropRect* cropRect = NULL) {
20        if (!SkScalarIsFinite(dx) || !SkScalarIsFinite(dy)) {
21            return NULL;
22        }
23        return SkNEW_ARGS(SkOffsetImageFilter, (dx, dy, input, cropRect));
24    }
25    void computeFastBounds(const SkRect& src, SkRect* dst) const SK_OVERRIDE;
26    SK_TO_STRING_OVERRIDE()
27    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkOffsetImageFilter)
28
29protected:
30    SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input, const CropRect* cropRect);
31    void flatten(SkWriteBuffer&) const SK_OVERRIDE;
32
33    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
34                               SkBitmap* result, SkIPoint* loc) const SK_OVERRIDE;
35    bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*) const SK_OVERRIDE;
36
37private:
38    SkVector fOffset;
39};
40
41#endif
42