lighting.cpp revision 0bccd8749bdce79b2d71518fe65783b1a9b06445 
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#include "SkOffsetImageFilter.h"
11#include "SkPoint3.h"
12
13#define WIDTH 330
14#define HEIGHT 660
15
16namespace skiagm {
17
18class ImageLightingGM : public GM {
19public:
20    ImageLightingGM() {
21        this->setBGColor(0xFF000000);
22    }
23
24protected:
25
26    SkString onShortName() override {
27        return SkString("lighting");
28    }
29
30    SkISize onISize() override {
31        return SkISize::Make(WIDTH, HEIGHT);
32    }
33
34    void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
35        canvas->save();
36        canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
37        canvas->clipRect(SkRect::MakeWH(
38          SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
39        canvas->drawBitmap(fBitmap, 0, 0, &paint);
40        canvas->restore();
41    }
42
43    void onOnceBeforeDraw() override {
44        fBitmap = sk_tool_utils::create_string_bitmap(100, 100, 0xFFFFFFFF, 20, 70, 96, "e");
45    }
46
47    void onDraw(SkCanvas* canvas) override {
48        canvas->clear(sk_tool_utils::color_to_565(0xFF101010));
49        SkPaint checkPaint;
50        checkPaint.setColor(sk_tool_utils::color_to_565(0xFF202020));
51        for (int y = 0; y < HEIGHT; y += 16) {
52          for (int x = 0; x < WIDTH; x += 16) {
53            canvas->save();
54            canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
55            canvas->drawRect(SkRect::MakeXYWH(8, 0, 8, 8), checkPaint);
56            canvas->drawRect(SkRect::MakeXYWH(0, 8, 8, 8), checkPaint);
57            canvas->restore();
58          }
59        }
60        SkPoint3 pointLocation = SkPoint3::Make(0, 0, SkIntToScalar(10));
61        SkScalar azimuthRad = SkDegreesToRadians(SkIntToScalar(225));
62        SkScalar elevationRad = SkDegreesToRadians(SkIntToScalar(5));
63        SkPoint3 distantDirection = SkPoint3::Make(SkScalarMul(SkScalarCos(azimuthRad),
64                                                               SkScalarCos(elevationRad)),
65                                                   SkScalarMul(SkScalarSin(azimuthRad),
66                                                               SkScalarCos(elevationRad)),
67                                                   SkScalarSin(elevationRad));
68        SkPoint3 spotLocation = SkPoint3::Make(SkIntToScalar(-10),
69                                               SkIntToScalar(-10),
70                                               SkIntToScalar(20));
71        SkPoint3 spotTarget = SkPoint3::Make(SkIntToScalar(40), SkIntToScalar(40), 0);
72        SkScalar spotExponent = SK_Scalar1;
73        SkScalar cutoffAngle = SkIntToScalar(15);
74        SkScalar kd = SkIntToScalar(2);
75        SkScalar ks = SkIntToScalar(1);
76        SkScalar shininess = SkIntToScalar(8);
77        SkScalar surfaceScale = SkIntToScalar(1);
78        SkColor white(0xFFFFFFFF);
79        SkPaint paint;
80
81        SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(20, 10, 60, 65));
82        SkImageFilter::CropRect fullSizeCropRect(SkRect::MakeXYWH(0, 0, 100, 100));
83        SkAutoTUnref<SkImageFilter> noopCropped(SkOffsetImageFilter::Create(0, 0, nullptr, &cropRect));
84
85        int y = 0;
86        for (int i = 0; i < 3; i++) {
87            const SkImageFilter::CropRect* cr = (i == 1) ? &cropRect : (i == 2) ? &fullSizeCropRect : nullptr;
88            SkImageFilter* input = (i == 2) ? noopCropped.get() : nullptr;
89            paint.setImageFilter(SkLightingImageFilter::CreatePointLitDiffuse(pointLocation,
90                                                                              white,
91                                                                              surfaceScale,
92                                                                              kd,
93                                                                              input,
94                                                                              cr))->unref();
95            drawClippedBitmap(canvas, paint, 0, y);
96
97            paint.setImageFilter(SkLightingImageFilter::CreateDistantLitDiffuse(distantDirection,
98                                                                                white,
99                                                                                surfaceScale,
100                                                                                kd,
101                                                                                input,
102                                                                                cr))->unref();
103            drawClippedBitmap(canvas, paint, 110, y);
104
105            paint.setImageFilter(SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation,
106                                                                             spotTarget,
107                                                                             spotExponent,
108                                                                             cutoffAngle,
109                                                                             white,
110                                                                             surfaceScale,
111                                                                             kd,
112                                                                             input,
113                                                                             cr))->unref();
114            drawClippedBitmap(canvas, paint, 220, y);
115
116            y += 110;
117
118            paint.setImageFilter(SkLightingImageFilter::CreatePointLitSpecular(pointLocation,
119                                                                               white,
120                                                                               surfaceScale,
121                                                                               ks,
122                                                                               shininess,
123                                                                               input,
124                                                                               cr))->unref();
125            drawClippedBitmap(canvas, paint, 0, y);
126
127            paint.setImageFilter(SkLightingImageFilter::CreateDistantLitSpecular(distantDirection,
128                                                                                 white,
129                                                                                 surfaceScale,
130                                                                                 ks,
131                                                                                 shininess,
132                                                                                 input,
133                                                                                 cr))->unref();
134            drawClippedBitmap(canvas, paint, 110, y);
135
136            paint.setImageFilter(SkLightingImageFilter::CreateSpotLitSpecular(spotLocation,
137                                                                              spotTarget,
138                                                                              spotExponent,
139                                                                              cutoffAngle,
140                                                                              white,
141                                                                              surfaceScale,
142                                                                              ks,
143                                                                              shininess,
144                                                                              input,
145                                                                              cr))->unref();
146            drawClippedBitmap(canvas, paint, 220, y);
147
148            y += 110;
149        }
150    }
151
152private:
153    SkBitmap fBitmap;
154
155    typedef GM INHERITED;
156};
157
158//////////////////////////////////////////////////////////////////////////////
159
160DEF_GM(return new ImageLightingGM;)
161}
162