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#include "SkCanvas.h"
10//#include "SkParsePath.h"
11#include "SkPath.h"
12//#include "SkRandom.h"
13
14namespace skiagm {
15
16static const SkColor gPathColor = SK_ColorBLACK;
17static const SkColor gClipAColor = SK_ColorBLUE;
18static const SkColor gClipBColor = SK_ColorRED;
19
20class ComplexClipGM : public GM {
21    bool fDoAAClip;
22    bool fDoSaveLayer;
23public:
24    ComplexClipGM(bool aaclip, bool saveLayer)
25    : fDoAAClip(aaclip)
26    , fDoSaveLayer(saveLayer) {
27        this->setBGColor(0xFFDDDDDD);
28//        this->setBGColor(SkColorSetRGB(0xB0,0xDD,0xB0));
29    }
30
31protected:
32
33    SkString onShortName() {
34        SkString str;
35        str.printf("complexclip_%s%s",
36                   fDoAAClip ? "aa" : "bw",
37                   fDoSaveLayer ? "_layer" : "");
38        return str;
39    }
40
41    SkISize onISize() { return make_isize(970, 780); }
42
43    virtual void onDraw(SkCanvas* canvas) {
44        SkPath path;
45        path.moveTo(SkIntToScalar(0),   SkIntToScalar(50));
46        path.quadTo(SkIntToScalar(0),   SkIntToScalar(0),   SkIntToScalar(50),  SkIntToScalar(0));
47        path.lineTo(SkIntToScalar(175), SkIntToScalar(0));
48        path.quadTo(SkIntToScalar(200), SkIntToScalar(0),   SkIntToScalar(200), SkIntToScalar(25));
49        path.lineTo(SkIntToScalar(200), SkIntToScalar(150));
50        path.quadTo(SkIntToScalar(200), SkIntToScalar(200), SkIntToScalar(150), SkIntToScalar(200));
51        path.lineTo(SkIntToScalar(0),   SkIntToScalar(200));
52        path.close();
53        path.moveTo(SkIntToScalar(50),  SkIntToScalar(50));
54        path.lineTo(SkIntToScalar(150), SkIntToScalar(50));
55        path.lineTo(SkIntToScalar(150), SkIntToScalar(125));
56        path.quadTo(SkIntToScalar(150), SkIntToScalar(150), SkIntToScalar(125), SkIntToScalar(150));
57        path.lineTo(SkIntToScalar(50),  SkIntToScalar(150));
58        path.close();
59        path.setFillType(SkPath::kEvenOdd_FillType);
60        SkPaint pathPaint;
61        pathPaint.setAntiAlias(true);
62        pathPaint.setColor(gPathColor);
63
64        SkPath clipA;
65        clipA.moveTo(SkIntToScalar(10),  SkIntToScalar(20));
66        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(22));
67        clipA.lineTo(SkIntToScalar(70),  SkIntToScalar(105));
68        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(177));
69        clipA.lineTo(SkIntToScalar(-5),  SkIntToScalar(180));
70        clipA.close();
71
72        SkPath clipB;
73        clipB.moveTo(SkIntToScalar(40),  SkIntToScalar(10));
74        clipB.lineTo(SkIntToScalar(190), SkIntToScalar(15));
75        clipB.lineTo(SkIntToScalar(195), SkIntToScalar(190));
76        clipB.lineTo(SkIntToScalar(40),  SkIntToScalar(185));
77        clipB.lineTo(SkIntToScalar(155), SkIntToScalar(100));
78        clipB.close();
79
80        SkPaint paint;
81        paint.setAntiAlias(true);
82        paint.setTextSize(SkIntToScalar(20));
83
84        static const struct {
85            SkRegion::Op fOp;
86            const char*  fName;
87        } gOps[] = { //extra spaces in names for measureText
88            {SkRegion::kIntersect_Op,         "Isect "},
89            {SkRegion::kDifference_Op,        "Diff " },
90            {SkRegion::kUnion_Op,             "Union "},
91            {SkRegion::kXOR_Op,               "Xor "  },
92            {SkRegion::kReverseDifference_Op, "RDiff "}
93        };
94
95        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
96        canvas->scale(3 * SK_Scalar1 / 4, 3 * SK_Scalar1 / 4);
97
98        if (fDoSaveLayer) {
99            // We want the layer to appear symmetric relative to actual
100            // device boundaries so we need to "undo" the effect of the
101            // scale and translate
102            SkRect bounds = SkRect::MakeLTRB(
103              SkFloatToScalar(4.0f/3.0f * -20),
104              SkFloatToScalar(4.0f/3.0f * -20),
105              SkFloatToScalar(4.0f/3.0f * (this->getISize().fWidth - 20)),
106              SkFloatToScalar(4.0f/3.0f * (this->getISize().fHeight - 20)));
107
108            bounds.inset(SkIntToScalar(100), SkIntToScalar(100));
109            SkPaint boundPaint;
110            boundPaint.setColor(SK_ColorRED);
111            boundPaint.setStyle(SkPaint::kStroke_Style);
112            canvas->drawRect(bounds, boundPaint);
113            canvas->saveLayer(&bounds, NULL);
114        }
115
116        for (int invBits = 0; invBits < 4; ++invBits) {
117            canvas->save();
118            for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); ++op) {
119                this->drawHairlines(canvas, path, clipA, clipB);
120
121                bool doInvA = SkToBool(invBits & 1);
122                bool doInvB = SkToBool(invBits & 2);
123                canvas->save();
124                    // set clip
125                    clipA.setFillType(doInvA ? SkPath::kInverseEvenOdd_FillType :
126                                      SkPath::kEvenOdd_FillType);
127                    clipB.setFillType(doInvB ? SkPath::kInverseEvenOdd_FillType :
128                                      SkPath::kEvenOdd_FillType);
129                    canvas->clipPath(clipA, SkRegion::kIntersect_Op, fDoAAClip);
130                    canvas->clipPath(clipB, gOps[op].fOp, fDoAAClip);
131
132                    // draw path clipped
133                    canvas->drawPath(path, pathPaint);
134                canvas->restore();
135
136
137                SkScalar txtX = SkIntToScalar(45);
138                paint.setColor(gClipAColor);
139                const char* aTxt = doInvA ? "InvA " : "A ";
140                canvas->drawText(aTxt, strlen(aTxt), txtX, SkIntToScalar(220), paint);
141                txtX += paint.measureText(aTxt, strlen(aTxt));
142                paint.setColor(SK_ColorBLACK);
143                canvas->drawText(gOps[op].fName, strlen(gOps[op].fName),
144                                    txtX, SkIntToScalar(220), paint);
145                txtX += paint.measureText(gOps[op].fName, strlen(gOps[op].fName));
146                paint.setColor(gClipBColor);
147                const char* bTxt = doInvB ? "InvB " : "B ";
148                canvas->drawText(bTxt, strlen(bTxt), txtX, SkIntToScalar(220), paint);
149
150                canvas->translate(SkIntToScalar(250),0);
151            }
152            canvas->restore();
153            canvas->translate(0, SkIntToScalar(250));
154        }
155
156        if (fDoSaveLayer) {
157            canvas->restore();
158        }
159    }
160private:
161    void drawHairlines(SkCanvas* canvas, const SkPath& path,
162                       const SkPath& clipA, const SkPath& clipB) {
163        SkPaint paint;
164        paint.setAntiAlias(true);
165        paint.setStyle(SkPaint::kStroke_Style);
166        const SkAlpha fade = 0x33;
167
168        // draw path in hairline
169        paint.setColor(gPathColor); paint.setAlpha(fade);
170        canvas->drawPath(path, paint);
171
172        // draw clips in hair line
173        paint.setColor(gClipAColor); paint.setAlpha(fade);
174        canvas->drawPath(clipA, paint);
175        paint.setColor(gClipBColor); paint.setAlpha(fade);
176        canvas->drawPath(clipB, paint);
177    }
178
179    typedef GM INHERITED;
180};
181
182//////////////////////////////////////////////////////////////////////////////
183
184// aliased and anti-aliased w/o a layer
185static GM* gFact0(void*) { return new ComplexClipGM(false, false); }
186static GM* gFact1(void*) { return new ComplexClipGM(true, false); }
187
188// aliased and anti-aliased w/ a layer
189static GM* gFact2(void*) { return new ComplexClipGM(false, true); }
190static GM* gFact3(void*) { return new ComplexClipGM(true, true); }
191
192static GMRegistry gReg0(gFact0);
193static GMRegistry gReg1(gFact1);
194static GMRegistry gReg2(gFact2);
195static GMRegistry gReg3(gFact3);
196
197}
198