1/*
2 * Copyright 2011 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 "samplecode/Sample.h"
9
10#include "include/core/SkCanvas.h"
11#include "include/core/SkFont.h"
12#include "include/core/SkMaskFilter.h"
13#include "include/core/SkPath.h"
14#include "include/utils/SkParsePath.h"
15#include "include/utils/SkRandom.h"
16#include "src/core/SkBlurMask.h"
17
18
19static void test_huge_stroke(SkCanvas* canvas) {
20    SkRect srcR = { 0, 0, 72000, 54000 };
21    SkRect dstR = { 0, 0, 640, 480 };
22
23    SkPath path;
24    path.moveTo(17600, 8000);
25    path.lineTo(52800, 8000);
26    path.lineTo(52800, 41600);
27    path.lineTo(17600, 41600);
28    path.close();
29
30    SkPaint paint;
31    paint.setAntiAlias(true);
32    paint.setStrokeWidth(8000);
33    paint.setStrokeMiter(10);
34    paint.setStrokeCap(SkPaint::kButt_Cap);
35    paint.setStrokeJoin(SkPaint::kRound_Join);
36    paint.setStyle(SkPaint::kStroke_Style);
37
38    canvas->concat(SkMatrix::RectToRect(srcR, dstR, SkMatrix::kCenter_ScaleToFit));
39
40    canvas->drawPath(path, paint);
41}
42
43#if 0
44static void test_blur() {
45    uint8_t cell[9];
46    memset(cell, 0xFF, sizeof(cell));
47    SkMask src;
48    src.fImage = cell;
49    src.fFormat = SkMask::kA8_Format;
50    SkMask dst;
51
52    for (int y = 1; y <= 3; y++) {
53        for (int x = 1; x <= 3; x++) {
54            src.fBounds.set(0, 0, x, y);
55            src.fRowBytes = src.fBounds.width();
56
57            SkScalar radius = 1.f;
58
59            printf("src [%d %d %d %d] radius %g\n", src.fBounds.fLeft, src.fBounds.fTop,
60                   src.fBounds.fRight, src.fBounds.fBottom, radius);
61
62            SkBlurMask::Blur(&dst, src, radius, SkBlurMask::kNormal_Style);
63            uint8_t* dstPtr = dst.fImage;
64
65            for (int y = 0; y < dst.fBounds.height(); y++) {
66                for (int x = 0; x < dst.fBounds.width(); x++) {
67                    printf(" %02X", dstPtr[x]);
68                }
69                printf("\n");
70                dstPtr += dst.fRowBytes;
71            }
72        }
73    }
74}
75#endif
76
77static void scale_to_width(SkPath* path, SkScalar dstWidth) {
78    const SkRect& bounds = path->getBounds();
79    SkScalar scale = dstWidth / bounds.width();
80    SkMatrix matrix;
81
82    matrix.setScale(scale, scale);
83    path->transform(matrix);
84}
85
86static const struct {
87    SkPaint::Style  fStyle;
88    SkPaint::Join   fJoin;
89    int             fStrokeWidth;
90} gRec[] = {
91    { SkPaint::kFill_Style,             SkPaint::kMiter_Join,   0 },
92    { SkPaint::kStroke_Style,           SkPaint::kMiter_Join,   0 },
93    { SkPaint::kStroke_Style,           SkPaint::kMiter_Join,   10 },
94    { SkPaint::kStrokeAndFill_Style,    SkPaint::kMiter_Join,   10 },
95};
96
97class StrokePathView : public Sample {
98    SkScalar    fWidth;
99    SkPath      fPath;
100protected:
101    void onOnceBeforeDraw() override {
102//        test_blur();
103        fWidth = SkIntToScalar(120);
104
105#if 0
106        const char str[] =
107            "M 0, 3"
108            "C 10, -10, 30, -10, 0, 28"
109            "C -30, -10, -10, -10, 0, 3"
110            "Z";
111        SkParsePath::FromSVGString(str, &fPath);
112#else
113        fPath.addCircle(0, 0, SkIntToScalar(50), SkPathDirection::kCW);
114        fPath.addCircle(0, SkIntToScalar(-50), SkIntToScalar(30), SkPathDirection::kCW);
115#endif
116
117        scale_to_width(&fPath, fWidth);
118        const SkRect& bounds = fPath.getBounds();
119        fPath.offset(-bounds.fLeft, -bounds.fTop);
120
121        this->setBGColor(0xFFDDDDDD);
122    }
123
124    SkString name() override { return SkString("StrokePath"); }
125
126    SkRandom rand;
127
128    void drawSet(SkCanvas* canvas, SkPaint* paint) {
129        SkAutoCanvasRestore acr(canvas, true);
130
131        for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); i++) {
132            paint->setStyle(gRec[i].fStyle);
133            paint->setStrokeJoin(gRec[i].fJoin);
134            paint->setStrokeWidth(SkIntToScalar(gRec[i].fStrokeWidth));
135            canvas->drawPath(fPath, *paint);
136            canvas->translate(fWidth * 5 / 4, 0);
137        }
138    }
139
140    void onDrawContent(SkCanvas* canvas) override {
141        test_huge_stroke(canvas); return;
142        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
143
144        SkPaint paint;
145        paint.setAntiAlias(true);
146
147        if (true) {
148            canvas->drawColor(SK_ColorBLACK);
149
150            SkFont font(nullptr, 24);
151            paint.setColor(SK_ColorWHITE);
152            canvas->translate(10, 30);
153
154            static const SkBlurStyle gStyle[] = {
155                kNormal_SkBlurStyle,
156                kInner_SkBlurStyle,
157                kOuter_SkBlurStyle,
158                kSolid_SkBlurStyle,
159            };
160            for (int x = 0; x < 5; x++) {
161                SkScalar sigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(4));
162                for (int y = 0; y < 10; y++) {
163                    if (x) {
164                        paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyle[x - 1], sigma));
165                    }
166                    canvas->drawString("Title Bar", x * 100.0f, y * 30.0f, font, paint);
167                    sigma *= 0.75f;
168                }
169
170            }
171            return;
172        }
173
174        paint.setColor(SK_ColorBLUE);
175
176#if 1
177        SkPath p;
178        float r = rand.nextUScalar1() + 0.5f;
179        SkScalar x = 0, y = 0;
180        p.moveTo(x, y);
181#if 0
182        p.cubicTo(x-75*r, y+75*r, x-40*r, y+125*r, x, y+85*r);
183        p.cubicTo(x+40*r, y+125*r, x+75*r, y+75*r, x, y);
184#else
185        p.cubicTo(x+75*r, y+75*r, x+40*r, y+125*r, x, y+85*r);
186        p.cubicTo(x-40*r, y+125*r, x-75*r, y+75*r, x, y);
187#endif
188        p.close();
189        fPath = p;
190        fPath.offset(100, 0);
191#endif
192
193        fPath.setFillType(SkPathFillType::kWinding);
194        drawSet(canvas, &paint);
195
196        canvas->translate(0, fPath.getBounds().height() * 5 / 4);
197        fPath.setFillType(SkPathFillType::kEvenOdd);
198        drawSet(canvas, &paint);
199    }
200
201private:
202    using INHERITED = Sample;
203};
204
205//////////////////////////////////////////////////////////////////////////////
206
207DEF_SAMPLE( return new StrokePathView(); )
208