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#include "include/core/SkBitmap.h"
8#include "include/core/SkCanvas.h"
9#include "include/core/SkColorFilter.h"
10#include "include/core/SkColorPriv.h"
11#include "include/core/SkGraphics.h"
12#include "include/core/SkPath.h"
13#include "include/core/SkRegion.h"
14#include "include/core/SkShader.h"
15#include "include/core/SkTime.h"
16#include "include/core/SkTypeface.h"
17#include "include/core/SkVertices.h"
18#include "include/effects/SkGradientShader.h"
19#include "include/utils/SkRandom.h"
20#include "samplecode/Sample.h"
21#include "src/utils/SkUTF.h"
22
23#include "include/core/SkStream.h"
24#include "src/core/SkOSFile.h"
25
26static sk_sp<SkShader> make_shader0(SkIPoint* size) {
27    SkBitmap    bm;
28    size->set(2, 2);
29    SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80);
30    SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff);
31    bm.allocN32Pixels(size->fX, size->fY);
32    bm.eraseColor(color0);
33    uint32_t* pixels = (uint32_t*) bm.getPixels();
34    pixels[0] = pixels[2] = color0;
35    pixels[1] = pixels[3] = color1;
36
37    return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
38                         SkSamplingOptions(SkFilterMode::kLinear));
39}
40
41static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
42    SkPoint pts[] = { { 0, 0 },
43                      { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
44    SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
45    return SkGradientShader::MakeLinear(pts, colors, nullptr,
46                    SK_ARRAY_COUNT(colors), SkTileMode::kMirror);
47}
48
49class VerticesView : public Sample {
50    sk_sp<SkShader> fShader0;
51    sk_sp<SkShader> fShader1;
52
53public:
54    VerticesView() {
55        SkIPoint    size;
56
57        fShader0 = make_shader0(&size);
58        fShader1 = make_shader1(size);
59
60        make_strip(&fRecs[0], size.fX, size.fY);
61        make_fan(&fRecs[1], size.fX, size.fY);
62        make_tris(&fRecs[2]);
63
64        fScale = SK_Scalar1;
65
66        this->setBGColor(SK_ColorGRAY);
67    }
68
69protected:
70    SkString name() override { return SkString("Vertices"); }
71
72    SkScalar fScale;
73
74    void onDrawContent(SkCanvas* canvas) override {
75        SkPaint paint;
76        paint.setDither(true);
77
78        for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
79            auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount,
80                                              fRecs[i].fVerts, fRecs[i].fTexs,
81                                              nullptr);
82            canvas->save();
83
84            paint.setShader(nullptr);
85            canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
86
87            canvas->translate(SkIntToScalar(250), 0);
88
89            paint.setShader(fShader0);
90            canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
91
92            canvas->translate(SkIntToScalar(250), 0);
93
94            paint.setShader(fShader1);
95            canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
96            canvas->restore();
97
98            canvas->translate(0, SkIntToScalar(250));
99        }
100    }
101
102    Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
103        return new Click();
104    }
105
106    bool onClick(Click* click) override {
107    //    fCurrX = click->fICurr.fX;
108    //    fCurrY = click->fICurr.fY;
109        return true;
110    }
111
112private:
113    struct Rec {
114        SkVertices::VertexMode  fMode;
115        int                     fCount;
116        SkPoint*                fVerts;
117        SkPoint*                fTexs;
118
119        Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
120        ~Rec() { delete[] fVerts; delete[] fTexs; }
121    };
122
123    void make_tris(Rec* rec) {
124        int n = 10;
125        SkRandom    rand;
126
127        rec->fMode = SkVertices::kTriangles_VertexMode;
128        rec->fCount = n * 3;
129        rec->fVerts = new SkPoint[rec->fCount];
130
131        for (int i = 0; i < n; i++) {
132            SkPoint* v = &rec->fVerts[i*3];
133            for (int j = 0; j < 3; j++) {
134                v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
135            }
136        }
137    }
138
139    void make_fan(Rec* rec, int texWidth, int texHeight) {
140        const SkScalar tx = SkIntToScalar(texWidth);
141        const SkScalar ty = SkIntToScalar(texHeight);
142        const int n = 24;
143
144        rec->fMode = SkVertices::kTriangleFan_VertexMode;
145        rec->fCount = n + 2;
146        rec->fVerts = new SkPoint[rec->fCount];
147        rec->fTexs  = new SkPoint[rec->fCount];
148
149        SkPoint* v = rec->fVerts;
150        SkPoint* t = rec->fTexs;
151
152        v[0].set(0, 0);
153        t[0].set(0, 0);
154        for (int i = 0; i < n; i++) {
155            SkScalar r   = SK_ScalarPI * 2 * i / n,
156                     sin = SkScalarSin(r),
157                     cos = SkScalarCos(r);
158            v[i+1].set(cos, sin);
159            t[i+1].set(i*tx/n, ty);
160        }
161        v[n+1] = v[1];
162        t[n+1].set(tx, ty);
163
164        SkMatrix m;
165        m.setScale(SkIntToScalar(100), SkIntToScalar(100));
166        m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
167        m.mapPoints(v, rec->fCount);
168    }
169
170    void make_strip(Rec* rec, int texWidth, int texHeight) {
171        const SkScalar tx = SkIntToScalar(texWidth);
172        const SkScalar ty = SkIntToScalar(texHeight);
173        const int n = 24;
174
175        rec->fMode = SkVertices::kTriangleStrip_VertexMode;
176        rec->fCount = 2 * (n + 1);
177        rec->fVerts = new SkPoint[rec->fCount];
178        rec->fTexs  = new SkPoint[rec->fCount];
179
180        SkPoint* v = rec->fVerts;
181        SkPoint* t = rec->fTexs;
182
183        for (int i = 0; i < n; i++) {
184            SkScalar r   = SK_ScalarPI * 2 * i / n,
185                     sin = SkScalarSin(r),
186                     cos = SkScalarCos(r);
187            v[i*2 + 0].set(cos/2, sin/2);
188            v[i*2 + 1].set(cos, sin);
189
190            t[i*2 + 0].set(tx * i / n, ty);
191            t[i*2 + 1].set(tx * i / n, 0);
192        }
193        v[2*n + 0] = v[0];
194        v[2*n + 1] = v[1];
195
196        t[2*n + 0].set(tx, ty);
197        t[2*n + 1].set(tx, 0);
198
199        SkMatrix m;
200        m.setScale(SkIntToScalar(100), SkIntToScalar(100));
201        m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
202        m.mapPoints(v, rec->fCount);
203    }
204
205    Rec fRecs[3];
206
207    using INHERITED = Sample;
208};
209
210//////////////////////////////////////////////////////////////////////////////
211
212DEF_SAMPLE( return new VerticesView(); )
213