lighting.cpp revision 7c0273f107d571a2147e4b2ad3f36c917bb12b22 
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
24    SkString onShortName() override {
25        return SkString("lighting");
26    }
27
28    void make_bitmap() {
29        fBitmap.allocN32Pixels(100, 100);
30        SkCanvas canvas(fBitmap);
31        canvas.clear(0x00000000);
32        SkPaint paint;
33        paint.setAntiAlias(true);
34        sk_tool_utils::set_portable_typeface(&paint);
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    SkISize onISize() override {
42        return SkISize::Make(WIDTH, HEIGHT);
43    }
44
45    void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
46        canvas->save();
47        canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
48        canvas->clipRect(SkRect::MakeWH(
49          SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
50        canvas->drawBitmap(fBitmap, 0, 0, &paint);
51        canvas->restore();
52    }
53
54    void onDraw(SkCanvas* canvas) override {
55        if (!fInitialized) {
56            make_bitmap();
57            fInitialized = true;
58        }
59        canvas->clear(0xFF101010);
60        SkPaint checkPaint;
61        checkPaint.setColor(0xFF202020);
62        for (int y = 0; y < HEIGHT; y += 16) {
63          for (int x = 0; x < WIDTH; x += 16) {
64            canvas->save();
65            canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
66            canvas->drawRect(SkRect::MakeXYWH(8, 0, 8, 8), checkPaint);
67            canvas->drawRect(SkRect::MakeXYWH(0, 8, 8, 8), checkPaint);
68            canvas->restore();
69          }
70        }
71        SkPoint3 pointLocation(0, 0, SkIntToScalar(10));
72        SkScalar azimuthRad = SkDegreesToRadians(SkIntToScalar(225));
73        SkScalar elevationRad = SkDegreesToRadians(SkIntToScalar(5));
74        SkPoint3 distantDirection(SkScalarMul(SkScalarCos(azimuthRad), SkScalarCos(elevationRad)),
75                                  SkScalarMul(SkScalarSin(azimuthRad), SkScalarCos(elevationRad)),
76                                  SkScalarSin(elevationRad));
77        SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20));
78        SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0);
79        SkScalar spotExponent = SK_Scalar1;
80        SkScalar cutoffAngle = SkIntToScalar(15);
81        SkScalar kd = SkIntToScalar(2);
82        SkScalar ks = SkIntToScalar(1);
83        SkScalar shininess = SkIntToScalar(8);
84        SkScalar surfaceScale = SkIntToScalar(1);
85        SkColor white(0xFFFFFFFF);
86        SkPaint paint;
87
88        SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(20, 10, 60, 65));
89
90        int y = 0;
91        for (int i = 0; i < 2; i++) {
92            const SkImageFilter::CropRect* cr = (i == 0) ? NULL : &cropRect;
93            paint.setImageFilter(SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd, NULL, cr))->unref();
94            drawClippedBitmap(canvas, paint, 0, y);
95
96            paint.setImageFilter(SkLightingImageFilter::CreateDistantLitDiffuse(distantDirection, white, surfaceScale, kd, NULL, cr))->unref();
97            drawClippedBitmap(canvas, paint, 110, y);
98
99            paint.setImageFilter(SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, kd, NULL, cr))->unref();
100            drawClippedBitmap(canvas, paint, 220, y);
101
102            y += 110;
103
104            paint.setImageFilter(SkLightingImageFilter::CreatePointLitSpecular(pointLocation, white, surfaceScale, ks, shininess, NULL, cr))->unref();
105            drawClippedBitmap(canvas, paint, 0, y);
106
107            paint.setImageFilter(SkLightingImageFilter::CreateDistantLitSpecular(distantDirection, white, surfaceScale, ks, shininess, NULL, cr))->unref();
108            drawClippedBitmap(canvas, paint, 110, y);
109
110            paint.setImageFilter(SkLightingImageFilter::CreateSpotLitSpecular(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, ks, shininess, NULL, cr))->unref();
111            drawClippedBitmap(canvas, paint, 220, y);
112
113            y += 110;
114        }
115    }
116
117private:
118    typedef GM INHERITED;
119    SkBitmap fBitmap;
120    bool fInitialized;
121};
122
123//////////////////////////////////////////////////////////////////////////////
124
125static GM* MyFactory(void*) { return new ImageLightingGM; }
126static GMRegistry reg(MyFactory);
127
128}
129