lighting.cpp revision 4e16bb2a322f2bd16cb1afd2f78c27e420a4b9db 
1/*
2 * Copyright 2012 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 "SkLightingImageFilter.h"
10
11#define WIDTH 330
12#define HEIGHT 440
13
14namespace skiagm {
15
16class ImageLightingGM : public GM {
17public:
18    ImageLightingGM() : fInitialized(false) {
19        this->setBGColor(0xFF000000);
20    }
21
22protected:
23    virtual SkString onShortName() {
24        return SkString("lighting");
25    }
26
27    void make_bitmap() {
28        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
29        fBitmap.allocPixels();
30        SkDevice device(fBitmap);
31        SkCanvas canvas(&device);
32        canvas.clear(0x00000000);
33        SkPaint paint;
34        paint.setAntiAlias(true);
35        paint.setColor(0xFFFFFFFF);
36        paint.setTextSize(SkIntToScalar(96));
37        const char* str = "e";
38        canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
39    }
40
41    virtual SkISize onISize() {
42        return make_isize(WIDTH, HEIGHT);
43    }
44
45    void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
46        canvas->save();
47        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
48            SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
49        canvas->drawBitmap(fBitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
50        canvas->restore();
51    }
52
53    virtual void onDraw(SkCanvas* canvas) {
54        if (!fInitialized) {
55            make_bitmap();
56            fInitialized = true;
57        }
58        canvas->clear(0xFF101010);
59        SkPaint checkPaint;
60        checkPaint.setColor(0xFF202020);
61        for (int y = 0; y < HEIGHT; y += 16) {
62          for (int x = 0; x < WIDTH; x += 16) {
63            canvas->save();
64            canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
65            canvas->drawRect(SkRect::MakeXYWH(8, 0, 8, 8), checkPaint);
66            canvas->drawRect(SkRect::MakeXYWH(0, 8, 8, 8), checkPaint);
67            canvas->restore();
68          }
69        }
70        SkPoint3 pointLocation(0, 0, SkIntToScalar(10));
71        SkScalar azimuthRad = SkDegreesToRadians(SkIntToScalar(225));
72        SkScalar elevationRad = SkDegreesToRadians(SkIntToScalar(5));
73        SkPoint3 distantDirection(SkScalarMul(SkScalarCos(azimuthRad), SkScalarCos(elevationRad)),
74                                  SkScalarMul(SkScalarSin(azimuthRad), SkScalarCos(elevationRad)),
75                                  SkScalarSin(elevationRad));
76        SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20));
77        SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0);
78        SkScalar spotExponent = SK_Scalar1;
79        SkScalar cutoffAngle = SkIntToScalar(15);
80        SkScalar kd = SkIntToScalar(2);
81        SkScalar ks = SkIntToScalar(1);
82        SkScalar shininess = SkIntToScalar(8);
83        SkScalar surfaceScale = SkIntToScalar(1);
84        SkColor white(0xFFFFFFFF);
85        SkPaint paint;
86
87        SkIRect cropRect = SkIRect::MakeXYWH(20, 10, 60, 65);
88
89        int y = 0;
90        for (int i = 0; i < 2; i++) {
91            const SkIRect* cr = (i == 0) ? NULL : &cropRect;
92            paint.setImageFilter(SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd, NULL, cr))->unref();
93            drawClippedBitmap(canvas, paint, 0, y);
94            paint.setImageFilter(SkLightingImageFilter::CreateDistantLitDiffuse(distantDirection, white, surfaceScale, kd, NULL, cr))->unref();
95            drawClippedBitmap(canvas, paint, 110, y);
96            paint.setImageFilter(SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, kd, NULL, cr))->unref();
97            drawClippedBitmap(canvas, paint, 220, y);
98
99            y += 110;
100            paint.setImageFilter(SkLightingImageFilter::CreatePointLitSpecular(pointLocation, white, surfaceScale, ks, shininess, NULL, cr))->unref();
101            drawClippedBitmap(canvas, paint, 0, y);
102            paint.setImageFilter(SkLightingImageFilter::CreateDistantLitSpecular(distantDirection, white, surfaceScale, ks, shininess, NULL, cr))->unref();
103            drawClippedBitmap(canvas, paint, 110, y);
104            paint.setImageFilter(SkLightingImageFilter::CreateSpotLitSpecular(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, ks, shininess, NULL, cr))->unref();
105            drawClippedBitmap(canvas, paint, 220, y);
106            y += 110;
107        }
108    }
109
110private:
111    typedef GM INHERITED;
112    SkBitmap fBitmap;
113    bool fInitialized;
114};
115
116//////////////////////////////////////////////////////////////////////////////
117
118static GM* MyFactory(void*) { return new ImageLightingGM; }
119static GMRegistry reg(MyFactory);
120
121}
122