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 "DecodeFile.h"
9 #include "SampleCode.h"
10 #include "SkAnimTimer.h"
11 #include "SkView.h"
12 #include "SkCanvas.h"
13 #include "SkGradientShader.h"
14 #include "SkGraphics.h"
15 #include "SkPath.h"
16 #include "SkRandom.h"
17 #include "SkRegion.h"
18 #include "SkShader.h"
19 #include "SkUtils.h"
20 #include "SkColorPriv.h"
21 #include "SkColorFilter.h"
22 #include "SkTime.h"
23 #include "SkTypeface.h"
24 #include "SkVertices.h"
25
26 #include "SkOSFile.h"
27 #include "SkStream.h"
28
29 #include "SkGeometry.h" // private include :(
30
make_shader0(SkIPoint * size)31 static sk_sp<SkShader> make_shader0(SkIPoint* size) {
32 SkBitmap bm;
33
34 // decode_file("/skimages/progressivejpg.jpg", &bm);
35 decode_file("/skimages/logo.png", &bm);
36 size->set(bm.width(), bm.height());
37 return SkShader::MakeBitmapShader(bm, SkShader::kClamp_TileMode,
38 SkShader::kClamp_TileMode);
39 }
40
make_shader1(const SkIPoint & size)41 static 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), SkShader::kMirror_TileMode);
47 }
48
49 ///////////////////////////////////////////////////////////////////////////////
50
51 class Patch {
52 public:
Patch()53 Patch() { sk_bzero(fPts, sizeof(fPts)); }
~Patch()54 ~Patch() {}
55
setPatch(const SkPoint pts[12])56 void setPatch(const SkPoint pts[12]) {
57 memcpy(fPts, pts, 12 * sizeof(SkPoint));
58 fPts[12] = pts[0]; // the last shall be first
59 }
setBounds(int w,int h)60 void setBounds(int w, int h) { fW = w; fH = h; }
61
62 void draw(SkCanvas*, const SkPaint&, int segsU, int segsV,
63 bool doTextures, bool doColors);
64
65 private:
66 SkPoint fPts[13];
67 int fW, fH;
68 };
69
eval_patch_edge(const SkPoint cubic[],SkPoint samples[],int segs)70 static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) {
71 SkScalar t = 0;
72 SkScalar dt = SK_Scalar1 / segs;
73
74 samples[0] = cubic[0];
75 for (int i = 1; i < segs; i++) {
76 t += dt;
77 SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr);
78 }
79 }
80
eval_sheet(const SkPoint edge[],int nu,int nv,int iu,int iv,SkPoint * pt)81 static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv,
82 SkPoint* pt) {
83 const int TL = 0;
84 const int TR = nu;
85 const int BR = TR + nv;
86 const int BL = BR + nu;
87
88 SkScalar u = SkIntToScalar(iu) / nu;
89 SkScalar v = SkIntToScalar(iv) / nv;
90
91 SkScalar uv = u * v;
92 SkScalar Uv = (1 - u) * v;
93 SkScalar uV = u * (1 - v);
94 SkScalar UV = (1 - u) * (1 - v);
95
96 SkScalar x0 = UV * edge[TL].fX + uV * edge[TR].fX + Uv * edge[BL].fX + uv * edge[BR].fX;
97 SkScalar y0 = UV * edge[TL].fY + uV * edge[TR].fY + Uv * edge[BL].fY + uv * edge[BR].fY;
98
99 SkScalar x = (1 - v) * edge[TL+iu].fX + u * edge[TR+iv].fX +
100 v * edge[BR+nu-iu].fX + (1 - u) * edge[BL+nv-iv].fX - x0;
101 SkScalar y = (1 - v) * edge[TL+iu].fY + u * edge[TR+iv].fY +
102 v * edge[BR+nu-iu].fY + (1 - u) * edge[BL+nv-iv].fY - y0;
103 pt->set(x, y);
104 }
105
make_color(SkScalar s,SkScalar t)106 static SkColor make_color(SkScalar s, SkScalar t) {
107 return SkColorSetARGB(0xFF, SkUnitScalarClampToByte(s), SkUnitScalarClampToByte(t), 0);
108 }
109
draw(SkCanvas * canvas,const SkPaint & paint,int nu,int nv,bool doTextures,bool doColors)110 void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
111 bool doTextures, bool doColors) {
112 if (nu < 1 || nv < 1) {
113 return;
114 }
115
116 int i, npts = (nu + nv) * 2;
117 SkAutoSTMalloc<16, SkPoint> storage(npts + 1);
118 SkPoint* edge0 = storage.get();
119 SkPoint* edge1 = edge0 + nu;
120 SkPoint* edge2 = edge1 + nv;
121 SkPoint* edge3 = edge2 + nu;
122
123 // evaluate the edge points
124 eval_patch_edge(fPts + 0, edge0, nu);
125 eval_patch_edge(fPts + 3, edge1, nv);
126 eval_patch_edge(fPts + 6, edge2, nu);
127 eval_patch_edge(fPts + 9, edge3, nv);
128 edge3[nv] = edge0[0]; // the last shall be first
129
130 for (i = 0; i < npts; i++) {
131 // canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint);
132 }
133
134 int row, vertCount = (nu + 1) * (nv + 1);
135 SkAutoTMalloc<SkPoint> vertStorage(vertCount);
136 SkPoint* verts = vertStorage.get();
137
138 // first row
139 memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint));
140 // rows
141 SkPoint* r = verts;
142 for (row = 1; row < nv; row++) {
143 r += nu + 1;
144 r[0] = edge3[nv - row];
145 for (int col = 1; col < nu; col++) {
146 eval_sheet(edge0, nu, nv, col, row, &r[col]);
147 }
148 r[nu] = edge1[row];
149 }
150 // last row
151 SkPoint* last = verts + nv * (nu + 1);
152 for (i = 0; i <= nu; i++) {
153 last[i] = edge2[nu - i];
154 }
155
156 // canvas->drawPoints(verts, vertCount, paint);
157
158 int stripCount = (nu + 1) * 2;
159 SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2);
160 SkAutoTMalloc<SkColor> colorStorage(stripCount);
161 SkPoint* strip = stripStorage.get();
162 SkPoint* tex = strip + stripCount;
163 SkColor* colors = colorStorage.get();
164 SkScalar t = 0;
165 const SkScalar ds = SK_Scalar1 * fW / nu;
166 const SkScalar dt = SK_Scalar1 * fH / nv;
167 r = verts;
168 for (row = 0; row < nv; row++) {
169 SkPoint* upper = r;
170 SkPoint* lower = r + nu + 1;
171 r = lower;
172 SkScalar s = 0;
173 for (i = 0; i <= nu; i++) {
174 strip[i*2 + 0] = *upper++;
175 strip[i*2 + 1] = *lower++;
176 tex[i*2 + 0].set(s, t);
177 tex[i*2 + 1].set(s, t + dt);
178 colors[i*2 + 0] = make_color(s/fW, t/fH);
179 colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH);
180 s += ds;
181 }
182 t += dt;
183 canvas->drawVertices(SkVertices::MakeCopy(SkVertices::kTriangleStrip_VertexMode, stripCount,
184 strip, doTextures ? tex : nullptr,
185 doColors ? colors : nullptr),
186 SkBlendMode::kModulate, paint);
187 }
188 }
189
drawpatches(SkCanvas * canvas,const SkPaint & paint,int nu,int nv,Patch * patch)190 static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
191 Patch* patch) {
192 SkAutoCanvasRestore ar(canvas, true);
193
194 patch->draw(canvas, paint, nu, nv, false, false);
195 canvas->translate(SkIntToScalar(180), 0);
196 patch->draw(canvas, paint, nu, nv, true, false);
197 canvas->translate(SkIntToScalar(180), 0);
198 patch->draw(canvas, paint, nu, nv, false, true);
199 canvas->translate(SkIntToScalar(180), 0);
200 patch->draw(canvas, paint, nu, nv, true, true);
201 }
202
203 const SkScalar DX = 20;
204 const SkScalar DY = 0;
205
206 class PatchView : public SampleView {
207 SkScalar fAngle;
208 sk_sp<SkShader> fShader0;
209 sk_sp<SkShader> fShader1;
210 SkIPoint fSize0, fSize1;
211 SkPoint fPts[12];
212
213 public:
PatchView()214 PatchView() : fAngle(0) {
215 fShader0 = make_shader0(&fSize0);
216 fSize1 = fSize0;
217 if (fSize0.fX == 0 || fSize0.fY == 0) {
218 fSize1.set(2, 2);
219 }
220 fShader1 = make_shader1(fSize1);
221
222 const SkScalar S = SkIntToScalar(50);
223 const SkScalar T = SkIntToScalar(40);
224 fPts[0].set(S*0, T);
225 fPts[1].set(S*1, T);
226 fPts[2].set(S*2, T);
227 fPts[3].set(S*3, T);
228 fPts[4].set(S*3, T*2);
229 fPts[5].set(S*3, T*3);
230 fPts[6].set(S*3, T*4);
231 fPts[7].set(S*2, T*4);
232 fPts[8].set(S*1, T*4);
233 fPts[9].set(S*0, T*4);
234 fPts[10].set(S*0, T*3);
235 fPts[11].set(S*0, T*2);
236
237 this->setBGColor(SK_ColorGRAY);
238 }
239
240 protected:
241 // overrides from SkEventSink
onQuery(SkEvent * evt)242 bool onQuery(SkEvent* evt) override {
243 if (SampleCode::TitleQ(*evt)) {
244 SampleCode::TitleR(evt, "Patch");
245 return true;
246 }
247 return this->INHERITED::onQuery(evt);
248 }
249
onDrawContent(SkCanvas * canvas)250 void onDrawContent(SkCanvas* canvas) override {
251 const int nu = 10;
252 const int nv = 10;
253
254 SkPaint paint;
255 paint.setDither(true);
256 paint.setFilterQuality(kLow_SkFilterQuality);
257
258 canvas->translate(DX, DY);
259
260 Patch patch;
261
262 paint.setShader(fShader0);
263 if (fSize0.fX == 0) {
264 fSize0.fX = 1;
265 }
266 if (fSize0.fY == 0) {
267 fSize0.fY = 1;
268 }
269 patch.setBounds(fSize0.fX, fSize0.fY);
270
271 patch.setPatch(fPts);
272 drawpatches(canvas, paint, nu, nv, &patch);
273
274 paint.setShader(nullptr);
275 paint.setAntiAlias(true);
276 paint.setStrokeWidth(SkIntToScalar(5));
277 canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint);
278
279 canvas->translate(0, SkIntToScalar(300));
280
281 paint.setAntiAlias(false);
282 paint.setShader(fShader1);
283 if (true) {
284 SkMatrix m;
285 m.setSkew(1, 0);
286 paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
287 }
288 if (true) {
289 SkMatrix m;
290 m.setRotate(fAngle);
291 paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
292 }
293 patch.setBounds(fSize1.fX, fSize1.fY);
294 drawpatches(canvas, paint, nu, nv, &patch);
295 }
296
onAnimate(const SkAnimTimer & timer)297 bool onAnimate(const SkAnimTimer& timer) override {
298 fAngle = timer.scaled(60, 360);
299 return true;
300 }
301
302 class PtClick : public Click {
303 public:
304 int fIndex;
PtClick(SkView * view,int index)305 PtClick(SkView* view, int index) : Click(view), fIndex(index) {}
306 };
307
hittest(const SkPoint & pt,SkScalar x,SkScalar y)308 static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) {
309 return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5);
310 }
311
onFindClickHandler(SkScalar x,SkScalar y,unsigned modi)312 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
313 x -= DX;
314 y -= DY;
315 for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
316 if (hittest(fPts[i], x, y)) {
317 return new PtClick(this, (int)i);
318 }
319 }
320 return this->INHERITED::onFindClickHandler(x, y, modi);
321 }
322
onClick(Click * click)323 bool onClick(Click* click) override {
324 fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY);
325 this->inval(nullptr);
326 return true;
327 }
328
329 private:
330 typedef SampleView INHERITED;
331 };
332
333 //////////////////////////////////////////////////////////////////////////////
334
MyFactory()335 static SkView* MyFactory() { return new PatchView; }
336 static SkViewRegister reg(MyFactory);
337
