drawlooper.cpp revision a90c6803865766d28e92091f56f718f5e41fe80f 
1/*
2 * Copyright 2011 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 "SkBlurMask.h"
10#include "SkBlurMaskFilter.h"
11#include "SkCanvas.h"
12#include "SkGraphics.h"
13#include "SkLayerDrawLooper.h"
14#include "SkRandom.h"
15
16#define WIDTH   200
17#define HEIGHT  200
18
19class DrawLooperGM : public skiagm::GM {
20public:
21    DrawLooperGM() : fLooper(NULL) {
22        this->setBGColor(0xFFDDDDDD);
23    }
24
25    virtual ~DrawLooperGM() {
26        SkSafeUnref(fLooper);
27    }
28
29protected:
30    virtual uint32_t onGetFlags() const SK_OVERRIDE {
31        return kSkipTiled_Flag;
32    }
33
34    virtual SkISize onISize() {
35        return SkISize::Make(520, 160);
36    }
37
38    virtual SkString onShortName() SK_OVERRIDE {
39        return SkString("drawlooper");
40    }
41
42    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
43        this->init();
44
45        SkPaint  paint;
46        paint.setAntiAlias(true);
47        paint.setTextSize(SkIntToScalar(72));
48        paint.setLooper(fLooper);
49
50        canvas->drawCircle(SkIntToScalar(50), SkIntToScalar(50),
51                           SkIntToScalar(30), paint);
52
53        canvas->drawRectCoords(SkIntToScalar(150), SkIntToScalar(50),
54                               SkIntToScalar(200), SkIntToScalar(100), paint);
55
56        canvas->drawText("Looper", 6, SkIntToScalar(230), SkIntToScalar(100),
57                         paint);
58    }
59
60private:
61    SkLayerDrawLooper*   fLooper;
62
63    void init() {
64        if (fLooper) return;
65
66        static const struct {
67            SkColor         fColor;
68            SkPaint::Style  fStyle;
69            SkScalar        fWidth;
70            SkScalar        fOffset;
71            SkScalar        fBlur;
72        } gParams[] = {
73            { SK_ColorWHITE, SkPaint::kStroke_Style, SkIntToScalar(1)*3/4, 0, 0 },
74            { SK_ColorRED, SkPaint::kStroke_Style, SkIntToScalar(4), 0, 0 },
75            { SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0 },
76            { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), SkIntToScalar(3) }
77        };
78
79        SkLayerDrawLooper::Builder looperBuilder;
80
81        SkLayerDrawLooper::LayerInfo info;
82        info.fPaintBits = SkLayerDrawLooper::kStyle_Bit | SkLayerDrawLooper::kMaskFilter_Bit;
83        info.fColorMode = SkXfermode::kSrc_Mode;
84
85        for (size_t i = 0; i < SK_ARRAY_COUNT(gParams); i++) {
86            info.fOffset.set(gParams[i].fOffset, gParams[i].fOffset);
87            SkPaint* paint = looperBuilder.addLayer(info);
88            paint->setColor(gParams[i].fColor);
89            paint->setStyle(gParams[i].fStyle);
90            paint->setStrokeWidth(gParams[i].fWidth);
91            if (gParams[i].fBlur > 0) {
92                SkMaskFilter* mf = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
93                                         SkBlurMask::ConvertRadiusToSigma(gParams[i].fBlur));
94                paint->setMaskFilter(mf)->unref();
95            }
96        }
97        fLooper = looperBuilder.detachLooper();
98    }
99
100    typedef GM INHERITED;
101};
102
103//////////////////////////////////////////////////////////////////////////////
104
105static skiagm::GM* MyFactory(void*) { return new DrawLooperGM; }
106static skiagm::GMRegistry reg(MyFactory);
107