resizeimagefilter.cpp revision cac5fd597f6e2495f50aaa6bcbe3dadc56f0b977 
1/*
2 * Copyright 2013 Google Inc.
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#include "gm.h"
9#include "SkColor.h"
10#include "SkResizeImageFilter.h"
11
12namespace skiagm {
13
14class ResizeGM : public GM {
15public:
16    ResizeGM() {
17        this->setBGColor(0x00000000);
18    }
19
20protected:
21    virtual SkString onShortName() {
22        return SkString("resizeimagefilter");
23    }
24
25    void draw(SkCanvas* canvas,
26              const SkRect& rect,
27              const SkSize& deviceSize,
28              SkPaint::FilterLevel filterLevel) {
29        SkRect dstRect;
30        canvas->getTotalMatrix().mapRect(&dstRect, rect);
31        canvas->save();
32        SkScalar deviceScaleX = SkScalarDiv(deviceSize.width(), dstRect.width());
33        SkScalar deviceScaleY = SkScalarDiv(deviceSize.height(), dstRect.height());
34        canvas->translate(rect.x(), rect.y());
35        canvas->scale(deviceScaleX, deviceScaleY);
36        canvas->translate(-rect.x(), -rect.y());
37        SkAutoTUnref<SkImageFilter> imageFilter(
38            SkResizeImageFilter::Create(SkScalarInvert(deviceScaleX),
39                                        SkScalarInvert(deviceScaleY),
40                                        filterLevel));
41        SkPaint filteredPaint;
42        filteredPaint.setImageFilter(imageFilter.get());
43        canvas->saveLayer(&rect, &filteredPaint);
44        SkPaint paint;
45        paint.setColor(0xFF00FF00);
46        SkRect ovalRect = rect;
47        ovalRect.inset(SkIntToScalar(4), SkIntToScalar(4));
48        canvas->drawOval(ovalRect, paint);
49        canvas->restore(); // for saveLayer
50        canvas->restore();
51    }
52
53    virtual SkISize onISize() {
54        return make_isize(420, 100);
55    }
56
57    virtual void onDraw(SkCanvas* canvas) {
58        canvas->clear(0x00000000);
59
60        SkRect srcRect = SkRect::MakeWH(96, 96);
61
62        SkSize deviceSize = SkSize::Make(16, 16);
63        draw(canvas,
64             srcRect,
65             deviceSize,
66             SkPaint::kNone_FilterLevel);
67
68        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
69        draw(canvas,
70             srcRect,
71             deviceSize,
72             SkPaint::kLow_FilterLevel);
73
74        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
75        draw(canvas,
76             srcRect,
77             deviceSize,
78             SkPaint::kMedium_FilterLevel);
79
80        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
81        draw(canvas,
82             srcRect,
83             deviceSize,
84             SkPaint::kHigh_FilterLevel);
85    }
86
87private:
88    typedef GM INHERITED;
89};
90
91//////////////////////////////////////////////////////////////////////////////
92
93static GM* MyFactory(void*) { return new ResizeGM; }
94static GMRegistry reg(MyFactory);
95
96}
97