aboutsummaryrefslogtreecommitdiffhomepage
path: root/gm/resizeimagefilter.cpp
blob: bb09e0b079f0a74d92b043a317be23b398c9ab21 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "gm.h"
#include "SkBitmapDevice.h"
#include "SkBitmapSource.h"
#include "SkColor.h"
#include "SkMatrixImageFilter.h"
#include "SkRefCnt.h"

namespace skiagm {

class ResizeGM : public GM {
public:
    ResizeGM() {
        this->setBGColor(0x00000000);
    }

protected:
    virtual SkString onShortName() {
        return SkString("resizeimagefilter");
    }

#ifdef SK_CPU_ARM64
    // Skip tiled drawing on 64-bit ARM until https://skbug.com/2908 is fixed.
    virtual uint32_t onGetFlags() const SK_OVERRIDE {
        return kSkipTiled_Flag;
    }
#endif

    void draw(SkCanvas* canvas,
              const SkRect& rect,
              const SkSize& deviceSize,
              SkPaint::FilterLevel filterLevel,
              SkImageFilter* input = NULL) {
        SkRect dstRect;
        canvas->getTotalMatrix().mapRect(&dstRect, rect);
        canvas->save();
        SkScalar deviceScaleX = SkScalarDiv(deviceSize.width(), dstRect.width());
        SkScalar deviceScaleY = SkScalarDiv(deviceSize.height(), dstRect.height());
        canvas->translate(rect.x(), rect.y());
        canvas->scale(deviceScaleX, deviceScaleY);
        canvas->translate(-rect.x(), -rect.y());
        SkMatrix matrix;
        matrix.setScale(SkScalarInvert(deviceScaleX),
                        SkScalarInvert(deviceScaleY));
        SkAutoTUnref<SkImageFilter> imageFilter(
            SkMatrixImageFilter::Create(matrix, filterLevel, input));
        SkPaint filteredPaint;
        filteredPaint.setImageFilter(imageFilter.get());
        canvas->saveLayer(&rect, &filteredPaint);
        SkPaint paint;
        paint.setColor(0xFF00FF00);
        SkRect ovalRect = rect;
        ovalRect.inset(SkIntToScalar(4), SkIntToScalar(4));
        canvas->drawOval(ovalRect, paint);
        canvas->restore(); // for saveLayer
        canvas->restore();
    }

    virtual SkISize onISize() {
        return SkISize::Make(520, 100);
    }

    virtual void onDraw(SkCanvas* canvas) {
        canvas->clear(0x00000000);

        SkRect srcRect = SkRect::MakeWH(96, 96);

        SkSize deviceSize = SkSize::Make(16, 16);
        draw(canvas,
             srcRect,
             deviceSize,
             SkPaint::kNone_FilterLevel);

        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
        draw(canvas,
             srcRect,
             deviceSize,
             SkPaint::kLow_FilterLevel);

        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
        draw(canvas,
             srcRect,
             deviceSize,
             SkPaint::kMedium_FilterLevel);

        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
        draw(canvas,
             srcRect,
             deviceSize,
             SkPaint::kHigh_FilterLevel);

        SkBitmap bitmap;
        bitmap.allocN32Pixels(16, 16);
        bitmap.eraseARGB(0x00, 0x00, 0x00, 0x00);
        {
            SkBitmapDevice bitmapDevice(bitmap);
            SkCanvas bitmapCanvas(&bitmapDevice);
            SkPaint paint;
            paint.setColor(0xFF00FF00);
            SkRect ovalRect = SkRect::MakeWH(16, 16);
            ovalRect.inset(SkScalarDiv(2.0f, 3.0f), SkScalarDiv(2.0f, 3.0f));
            bitmapCanvas.drawOval(ovalRect, paint);
        }
        SkRect inRect = SkRect::MakeXYWH(-4, -4, 20, 20);
        SkRect outRect = SkRect::MakeXYWH(-24, -24, 120, 120);
        SkAutoTUnref<SkBitmapSource> source(SkBitmapSource::Create(bitmap, inRect, outRect));
        canvas->translate(srcRect.width() + SkIntToScalar(10), 0);
        draw(canvas,
             srcRect,
             deviceSize,
             SkPaint::kHigh_FilterLevel,
             source.get());
    }

private:
    typedef GM INHERITED;
};

//////////////////////////////////////////////////////////////////////////////

static GM* MyFactory(void*) { return new ResizeGM; }
static GMRegistry reg(MyFactory);

}