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 "SkBitmapDevice.h"
10#include "SkBitmapSource.h"
11#include "SkColor.h"
12#include "SkMatrixImageFilter.h"
13#include "SkRefCnt.h"
14
15namespace skiagm {
16
17class ResizeGM : public GM {
18public:
19    ResizeGM() {
20        this->setBGColor(0x00000000);
21    }
22
23protected:
24    virtual SkString onShortName() {
25        return SkString("resizeimagefilter");
26    }
27
28#ifdef SK_CPU_ARM64
29    // Skip tiled drawing on 64-bit ARM until https://skbug.com/2908 is fixed.
30    virtual uint32_t onGetFlags() const SK_OVERRIDE {
31        return kSkipTiled_Flag;
32    }
33#endif
34
35    void draw(SkCanvas* canvas,
36              const SkRect& rect,
37              const SkSize& deviceSize,
38              SkPaint::FilterLevel filterLevel,
39              SkImageFilter* input = NULL) {
40        SkRect dstRect;
41        canvas->getTotalMatrix().mapRect(&dstRect, rect);
42        canvas->save();
43        SkScalar deviceScaleX = SkScalarDiv(deviceSize.width(), dstRect.width());
44        SkScalar deviceScaleY = SkScalarDiv(deviceSize.height(), dstRect.height());
45        canvas->translate(rect.x(), rect.y());
46        canvas->scale(deviceScaleX, deviceScaleY);
47        canvas->translate(-rect.x(), -rect.y());
48        SkMatrix matrix;
49        matrix.setScale(SkScalarInvert(deviceScaleX),
50                        SkScalarInvert(deviceScaleY));
51        SkAutoTUnref<SkImageFilter> imageFilter(
52            SkMatrixImageFilter::Create(matrix, filterLevel, input));
53        SkPaint filteredPaint;
54        filteredPaint.setImageFilter(imageFilter.get());
55        canvas->saveLayer(&rect, &filteredPaint);
56        SkPaint paint;
57        paint.setColor(0xFF00FF00);
58        SkRect ovalRect = rect;
59        ovalRect.inset(SkIntToScalar(4), SkIntToScalar(4));
60        canvas->drawOval(ovalRect, paint);
61        canvas->restore(); // for saveLayer
62        canvas->restore();
63    }
64
65    virtual SkISize onISize() {
66        return SkISize::Make(520, 100);
67    }
68
69    virtual void onDraw(SkCanvas* canvas) {
70        canvas->clear(0x00000000);
71
72        SkRect srcRect = SkRect::MakeWH(96, 96);
73
74        SkSize deviceSize = SkSize::Make(16, 16);
75        draw(canvas,
76             srcRect,
77             deviceSize,
78             SkPaint::kNone_FilterLevel);
79
80        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
81        draw(canvas,
82             srcRect,
83             deviceSize,
84             SkPaint::kLow_FilterLevel);
85
86        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
87        draw(canvas,
88             srcRect,
89             deviceSize,
90             SkPaint::kMedium_FilterLevel);
91
92        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
93        draw(canvas,
94             srcRect,
95             deviceSize,
96             SkPaint::kHigh_FilterLevel);
97
98        SkBitmap bitmap;
99        bitmap.allocN32Pixels(16, 16);
100        bitmap.eraseARGB(0x00, 0x00, 0x00, 0x00);
101        {
102            SkBitmapDevice bitmapDevice(bitmap);
103            SkCanvas bitmapCanvas(&bitmapDevice);
104            SkPaint paint;
105            paint.setColor(0xFF00FF00);
106            SkRect ovalRect = SkRect::MakeWH(16, 16);
107            ovalRect.inset(SkScalarDiv(2.0f, 3.0f), SkScalarDiv(2.0f, 3.0f));
108            bitmapCanvas.drawOval(ovalRect, paint);
109        }
110        SkRect inRect = SkRect::MakeXYWH(-4, -4, 20, 20);
111        SkRect outRect = SkRect::MakeXYWH(-24, -24, 120, 120);
112        SkAutoTUnref<SkBitmapSource> source(SkBitmapSource::Create(bitmap, inRect, outRect));
113        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
114        draw(canvas,
115             srcRect,
116             deviceSize,
117             SkPaint::kHigh_FilterLevel,
118             source.get());
119    }
120
121private:
122    typedef GM INHERITED;
123};
124
125//////////////////////////////////////////////////////////////////////////////
126
127static GM* MyFactory(void*) { return new ResizeGM; }
128static GMRegistry reg(MyFactory);
129
130}
131