1/*
2 * Copyright 2015 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 "SkBlurImageFilter.h"
9#include "SkColor.h"
10#include "SkDropShadowImageFilter.h"
11#include "SkOffsetImageFilter.h"
12#include "SkScalar.h"
13#include "gm.h"
14
15#define RESIZE_FACTOR_X SkIntToScalar(2)
16#define RESIZE_FACTOR_Y SkIntToScalar(5)
17
18namespace skiagm {
19
20class ImageFiltersStrokedGM : public GM {
21public:
22    ImageFiltersStrokedGM() {
23        this->setBGColor(0x00000000);
24    }
25
26protected:
27
28    SkString onShortName() override {
29        return SkString("imagefiltersstroked");
30    }
31
32    SkISize onISize() override {
33        return SkISize::Make(860, 500);
34    }
35
36    static void draw_circle(SkCanvas* canvas, const SkRect& r, const SkPaint& paint) {
37        canvas->drawCircle(r.centerX(), r.centerY(),
38                           r.width() * 2 / 5, paint);
39    }
40
41    static void draw_line(SkCanvas* canvas, const SkRect& r, const SkPaint& paint) {
42        canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, paint);
43    }
44
45    static void draw_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& paint) {
46        canvas->drawRect(r, paint);
47    }
48
49    void onDraw(SkCanvas* canvas) override {
50        void (*drawProc[])(SkCanvas*, const SkRect&, const SkPaint&) = {
51            draw_line, draw_rect, draw_circle,
52        };
53
54        canvas->clear(SK_ColorBLACK);
55
56        SkMatrix resizeMatrix;
57        resizeMatrix.setScale(RESIZE_FACTOR_X, RESIZE_FACTOR_Y);
58
59        sk_sp<SkImageFilter> filters[] = {
60            SkBlurImageFilter::Make(5, 5, nullptr),
61            SkDropShadowImageFilter::Make(10, 10, 3, 3, SK_ColorGREEN,
62                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
63                nullptr),
64            SkOffsetImageFilter::Make(-16, 32, nullptr),
65            SkImageFilter::MakeMatrixFilter(resizeMatrix, kNone_SkFilterQuality, nullptr),
66        };
67
68        SkRect r = SkRect::MakeWH(64, 64);
69        SkScalar margin = 32;
70        SkPaint paint;
71        paint.setColor(SK_ColorWHITE);
72        paint.setAntiAlias(true);
73        paint.setStrokeWidth(10);
74        paint.setStyle(SkPaint::kStroke_Style);
75        paint.setTextSize(48);
76        paint.setTextAlign(SkPaint::kCenter_Align);
77
78        for (size_t i = 0; i < SK_ARRAY_COUNT(drawProc); ++i) {
79            canvas->translate(0, margin);
80            canvas->save();
81            for (size_t j = 0; j < SK_ARRAY_COUNT(filters); ++j) {
82                canvas->translate(margin, 0);
83                canvas->save();
84                if (2 == j) {
85                    canvas->translate(16, -32);
86                } else if (3 == j) {
87                    canvas->scale(SkScalarInvert(RESIZE_FACTOR_X),
88                                  SkScalarInvert(RESIZE_FACTOR_Y));
89                }
90                paint.setImageFilter(filters[j]);
91                drawProc[i](canvas, r, paint);
92                canvas->restore();
93                canvas->translate(r.width() + margin, 0);
94            }
95            canvas->restore();
96            canvas->translate(0, r.height());
97        }
98    }
99
100private:
101    typedef GM INHERITED;
102};
103
104//////////////////////////////////////////////////////////////////////////////
105
106DEF_GM(return new ImageFiltersStrokedGM;)
107
108}
109