pathfill.cpp revision d74e710c00700aea603d7843d3ff670043bb1c15 
1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "gm.h"
9
10typedef SkScalar (*MakePathProc)(SkPath*);
11
12static SkScalar make_frame(SkPath* path) {
13    SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
14                 SkIntToScalar(630), SkIntToScalar(470) };
15    path->addRoundRect(r, SkIntToScalar(15), SkIntToScalar(15));
16
17    SkPaint paint;
18    paint.setStyle(SkPaint::kStroke_Style);
19    paint.setStrokeWidth(SkIntToScalar(5));
20    paint.getFillPath(*path, path);
21    return SkIntToScalar(15);
22}
23
24static SkScalar make_triangle(SkPath* path) {
25    static const int gCoord[] = {
26        10, 20, 15, 5, 30, 30
27    };
28    path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
29    path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
30    path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
31    path->close();
32    path->offset(SkIntToScalar(10), SkIntToScalar(0));
33    return SkIntToScalar(30);
34}
35
36static SkScalar make_rect(SkPath* path) {
37    SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
38                 SkIntToScalar(30), SkIntToScalar(30) };
39    path->addRect(r);
40    path->offset(SkIntToScalar(10), SkIntToScalar(0));
41    return SkIntToScalar(30);
42}
43
44static SkScalar make_oval(SkPath* path) {
45    SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
46                 SkIntToScalar(30), SkIntToScalar(30) };
47    path->addOval(r);
48    path->offset(SkIntToScalar(10), SkIntToScalar(0));
49    return SkIntToScalar(30);
50}
51
52static SkScalar make_sawtooth(SkPath* path) {
53    SkScalar x = SkIntToScalar(20);
54    SkScalar y = SkIntToScalar(20);
55    const SkScalar x0 = x;
56    const SkScalar dx = SK_Scalar1 * 5;
57    const SkScalar dy = SK_Scalar1 * 10;
58
59    path->moveTo(x, y);
60    for (int i = 0; i < 32; i++) {
61        x += dx;
62        path->lineTo(x, y - dy);
63        x += dx;
64        path->lineTo(x, y + dy);
65    }
66    path->lineTo(x, y + (2 * dy));
67    path->lineTo(x0, y + (2 * dy));
68    path->close();
69    return SkIntToScalar(30);
70}
71
72static SkScalar make_star(SkPath* path, int n) {
73    const SkScalar c = SkIntToScalar(45);
74    const SkScalar r = SkIntToScalar(20);
75
76    SkScalar rad = -SK_ScalarPI / 2;
77    const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
78
79    path->moveTo(c, c - r);
80    for (int i = 1; i < n; i++) {
81        rad += drad;
82        SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
83        path->lineTo(c + SkScalarMul(cosV, r), c + SkScalarMul(sinV, r));
84    }
85    path->close();
86    return r * 2 * 6 / 5;
87}
88
89static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
90static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }
91
92// We don't expect any output from this path.
93static SkScalar make_line(SkPath* path) {
94    path->moveTo(SkIntToScalar(30), SkIntToScalar(30));
95    path->lineTo(SkIntToScalar(120), SkIntToScalar(40));
96    path->close();
97    path->moveTo(SkIntToScalar(150), SkIntToScalar(30));
98    path->lineTo(SkIntToScalar(150), SkIntToScalar(30));
99    path->lineTo(SkIntToScalar(300), SkIntToScalar(40));
100    path->close();
101    return SkIntToScalar(40);
102}
103
104static const MakePathProc gProcs[] = {
105    make_frame,
106    make_triangle,
107    make_rect,
108    make_oval,
109    make_sawtooth,
110    make_star_5,
111    make_star_13,
112    make_line,
113};
114
115#define N   SK_ARRAY_COUNT(gProcs)
116
117class PathFillGM : public skiagm::GM {
118    SkPath  fPath[N];
119    SkScalar fDY[N];
120public:
121    PathFillGM() {
122        for (size_t i = 0; i < N; i++) {
123            fDY[i] = gProcs[i](&fPath[i]);
124        }
125    }
126
127protected:
128    virtual SkString onShortName() {
129        return SkString("pathfill");
130    }
131
132    virtual SkISize onISize() {
133        return SkISize::Make(640, 480);
134    }
135
136    virtual void onDraw(SkCanvas* canvas) {
137        SkPaint paint;
138        paint.setAntiAlias(true);
139
140        for (size_t i = 0; i < N; i++) {
141            canvas->drawPath(fPath[i], paint);
142            canvas->translate(SkIntToScalar(0), fDY[i]);
143        }
144    }
145
146private:
147    typedef skiagm::GM INHERITED;
148};
149
150// test inverse-fill w/ a clip that completely excludes the geometry
151class PathInverseFillGM : public skiagm::GM {
152    SkPath  fPath[N];
153    SkScalar fDY[N];
154public:
155    PathInverseFillGM() {
156        for (size_t i = 0; i < N; i++) {
157            fDY[i] = gProcs[i](&fPath[i]);
158        }
159    }
160
161protected:
162    virtual SkString onShortName() {
163        return SkString("pathinvfill");
164    }
165
166    virtual SkISize onISize() {
167        return SkISize::Make(450, 220);
168    }
169
170    static void show(SkCanvas* canvas, const SkPath& path, const SkPaint& paint,
171                     const SkRect* clip, SkScalar top, const SkScalar bottom) {
172        canvas->save();
173        if (clip) {
174            SkRect r = *clip;
175            r.fTop = top;
176            r.fBottom = bottom;
177            canvas->clipRect(r);
178        }
179        canvas->drawPath(path, paint);
180        canvas->restore();
181    }
182
183    virtual void onDraw(SkCanvas* canvas) {
184        SkPath path;
185
186        path.addCircle(SkIntToScalar(50), SkIntToScalar(50), SkIntToScalar(40));
187        path.toggleInverseFillType();
188
189        SkRect clipR = { 0, 0, SkIntToScalar(100), SkIntToScalar(200) };
190
191        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
192
193        for (int doclip = 0; doclip <= 1; ++doclip) {
194            for (int aa = 0; aa <= 1; ++aa) {
195                SkPaint paint;
196                paint.setAntiAlias(SkToBool(aa));
197
198                canvas->save();
199                canvas->clipRect(clipR);
200
201                const SkRect* clipPtr = doclip ? &clipR : NULL;
202
203                show(canvas, path, paint, clipPtr, clipR.fTop, clipR.centerY());
204                show(canvas, path, paint, clipPtr, clipR.centerY(), clipR.fBottom);
205
206                canvas->restore();
207                canvas->translate(SkIntToScalar(110), 0);
208            }
209        }
210    }
211
212private:
213    typedef skiagm::GM INHERITED;
214};
215
216///////////////////////////////////////////////////////////////////////////////
217
218static skiagm::GM* MyFactory(void*) { return new PathFillGM; }
219static skiagm::GMRegistry reg(MyFactory);
220
221static skiagm::GM* F1(void*) { return new PathInverseFillGM; }
222static skiagm::GMRegistry gR1(F1);
223
224