blob: 5f39eda37acc7a53ea2b29a880b31e89a81ac9b6 [file] [log] [blame]
epoger@google.comec3ed6a2011-07-28 14:26:00 +00001
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 */
reed@android.com8a1c16f2008-12-17 15:59:43 +00008#include "SampleCode.h"
9#include "SkView.h"
10#include "SkCanvas.h"
11#include "SkGradientShader.h"
12#include "SkGraphics.h"
13#include "SkImageDecoder.h"
14#include "SkPath.h"
reed@android.com8a1c16f2008-12-17 15:59:43 +000015#include "SkRandom.h"
16#include "SkRegion.h"
17#include "SkShader.h"
18#include "SkUtils.h"
19#include "SkXfermode.h"
reed@android.com8a1c16f2008-12-17 15:59:43 +000020#include "SkColorPriv.h"
21#include "SkColorFilter.h"
22#include "SkTime.h"
23#include "SkTypeface.h"
24
reed@android.com8a1c16f2008-12-17 15:59:43 +000025#include "SkOSFile.h"
26#include "SkStream.h"
27
28#include "SkGeometry.h" // private include :(
29
reed@android.com8a1c16f2008-12-17 15:59:43 +000030static SkShader* make_shader0(SkIPoint* size) {
31 SkBitmap bm;
reed@google.com82065d62011-02-07 15:30:46 +000032
reed@android.com8a1c16f2008-12-17 15:59:43 +000033// SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm);
reed@android.comf2b98d62010-12-20 18:26:13 +000034 SkImageDecoder::DecodeFile("/skimages/logo.png", &bm);
reed@android.com8a1c16f2008-12-17 15:59:43 +000035 size->set(bm.width(), bm.height());
36 return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode,
37 SkShader::kClamp_TileMode);
38}
39
40static SkShader* make_shader1(const SkIPoint& size) {
senorblanco@chromium.org64cc5792011-05-19 19:58:58 +000041 SkPoint pts[] = { { 0, 0, },
42 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
reed@android.com8a1c16f2008-12-17 15:59:43 +000043 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
44 return SkGradientShader::CreateLinear(pts, colors, NULL,
45 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode, NULL);
46}
47
48///////////////////////////////////////////////////////////////////////////////
49
50class Patch {
51public:
reed@android.com4516f472009-06-29 16:25:36 +000052 Patch() { sk_bzero(fPts, sizeof(fPts)); }
reed@android.com8a1c16f2008-12-17 15:59:43 +000053 ~Patch() {}
reed@google.com82065d62011-02-07 15:30:46 +000054
reed@android.com8a1c16f2008-12-17 15:59:43 +000055 void setPatch(const SkPoint pts[12]) {
56 memcpy(fPts, pts, 12 * sizeof(SkPoint));
57 fPts[12] = pts[0]; // the last shall be first
58 }
59 void setBounds(int w, int h) { fW = w; fH = h; }
60
61 void draw(SkCanvas*, const SkPaint&, int segsU, int segsV,
62 bool doTextures, bool doColors);
reed@google.com82065d62011-02-07 15:30:46 +000063
reed@android.com8a1c16f2008-12-17 15:59:43 +000064private:
65 SkPoint fPts[13];
66 int fW, fH;
67};
68
69static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) {
70 SkScalar t = 0;
71 SkScalar dt = SK_Scalar1 / segs;
72
73 samples[0] = cubic[0];
74 for (int i = 1; i < segs; i++) {
75 t += dt;
76 SkEvalCubicAt(cubic, t, &samples[i], NULL, NULL);
77 }
78}
79
80static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv,
81 SkPoint* pt) {
82 const int TL = 0;
83 const int TR = nu;
84 const int BR = TR + nv;
85 const int BL = BR + nu;
86
87 SkScalar u = SkIntToScalar(iu) / nu;
88 SkScalar v = SkIntToScalar(iv) / nv;
reed@google.com82065d62011-02-07 15:30:46 +000089
reed@android.com8a1c16f2008-12-17 15:59:43 +000090 SkScalar uv = SkScalarMul(u, v);
91 SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v);
92 SkScalar uV = SkScalarMul(u, SK_Scalar1 - v);
93 SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v);
reed@google.com82065d62011-02-07 15:30:46 +000094
reed@android.com8a1c16f2008-12-17 15:59:43 +000095 SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) +
96 SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX);
97 SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) +
98 SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY);
99
100 SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) +
101 SkScalarMul(u, edge[TR+iv].fX) +
102 SkScalarMul(v, edge[BR+nu-iu].fX) +
103 SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0;
104 SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) +
105 SkScalarMul(u, edge[TR+iv].fY) +
106 SkScalarMul(v, edge[BR+nu-iu].fY) +
107 SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0;
108 pt->set(x, y);
109}
110
111static int ScalarTo255(SkScalar v) {
112 int scale = SkScalarToFixed(v) >> 8;
113 if (scale < 0) {
114 scale = 0;
115 } else if (scale > 255) {
116 scale = 255;
117 }
118 return scale;
119}
120
121static SkColor make_color(SkScalar s, SkScalar t) {
122 int cs = ScalarTo255(s);
reed@google.com82065d62011-02-07 15:30:46 +0000123 int ct = ScalarTo255(t);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000124 return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 0);
125}
126
127void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
128 bool doTextures, bool doColors) {
129 if (nu < 1 || nv < 1) {
130 return;
131 }
132
133 int i, npts = (nu + nv) * 2;
134 SkAutoSTMalloc<16, SkPoint> storage(npts + 1);
135 SkPoint* edge0 = storage.get();
136 SkPoint* edge1 = edge0 + nu;
137 SkPoint* edge2 = edge1 + nv;
138 SkPoint* edge3 = edge2 + nu;
reed@google.com82065d62011-02-07 15:30:46 +0000139
reed@android.com8a1c16f2008-12-17 15:59:43 +0000140 // evaluate the edge points
141 eval_patch_edge(fPts + 0, edge0, nu);
142 eval_patch_edge(fPts + 3, edge1, nv);
143 eval_patch_edge(fPts + 6, edge2, nu);
144 eval_patch_edge(fPts + 9, edge3, nv);
145 edge3[nv] = edge0[0]; // the last shall be first
reed@google.com82065d62011-02-07 15:30:46 +0000146
reed@android.com8a1c16f2008-12-17 15:59:43 +0000147 for (i = 0; i < npts; i++) {
148// canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint);
149 }
reed@google.com82065d62011-02-07 15:30:46 +0000150
reed@android.com8a1c16f2008-12-17 15:59:43 +0000151 int row, vertCount = (nu + 1) * (nv + 1);
152 SkAutoTMalloc<SkPoint> vertStorage(vertCount);
153 SkPoint* verts = vertStorage.get();
reed@google.com82065d62011-02-07 15:30:46 +0000154
reed@android.com8a1c16f2008-12-17 15:59:43 +0000155 // first row
156 memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint));
157 // rows
158 SkPoint* r = verts;
159 for (row = 1; row < nv; row++) {
160 r += nu + 1;
161 r[0] = edge3[nv - row];
162 for (int col = 1; col < nu; col++) {
163 eval_sheet(edge0, nu, nv, col, row, &r[col]);
164 }
165 r[nu] = edge1[row];
166 }
167 // last row
168 SkPoint* last = verts + nv * (nu + 1);
169 for (i = 0; i <= nu; i++) {
170 last[i] = edge2[nu - i];
171 }
reed@google.com82065d62011-02-07 15:30:46 +0000172
reed@android.com8a1c16f2008-12-17 15:59:43 +0000173// canvas->drawPoints(verts, vertCount, paint);
reed@google.com82065d62011-02-07 15:30:46 +0000174
reed@android.com8a1c16f2008-12-17 15:59:43 +0000175 int stripCount = (nu + 1) * 2;
176 SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2);
177 SkAutoTMalloc<SkColor> colorStorage(stripCount);
178 SkPoint* strip = stripStorage.get();
179 SkPoint* tex = strip + stripCount;
180 SkColor* colors = colorStorage.get();
181 SkScalar t = 0;
182 const SkScalar ds = SK_Scalar1 * fW / nu;
183 const SkScalar dt = SK_Scalar1 * fH / nv;
184 r = verts;
185 for (row = 0; row < nv; row++) {
186 SkPoint* upper = r;
187 SkPoint* lower = r + nu + 1;
188 r = lower;
189 SkScalar s = 0;
190 for (i = 0; i <= nu; i++) {
191 strip[i*2 + 0] = *upper++;
192 strip[i*2 + 1] = *lower++;
193 tex[i*2 + 0].set(s, t);
194 tex[i*2 + 1].set(s, t + dt);
195 colors[i*2 + 0] = make_color(s/fW, t/fH);
196 colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH);
197 s += ds;
198 }
199 t += dt;
200 canvas->drawVertices(SkCanvas::kTriangleStrip_VertexMode, stripCount,
201 strip, doTextures ? tex : NULL,
202 doColors ? colors : NULL, NULL,
203 NULL, 0, paint);
204 }
205}
206
207static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
208 Patch* patch) {
209
210 SkAutoCanvasRestore ar(canvas, true);
211
212 patch->draw(canvas, paint, 10, 10, false, false);
reed@android.com6b82d1a2009-06-03 02:35:01 +0000213 canvas->translate(SkIntToScalar(180), 0);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000214 patch->draw(canvas, paint, 10, 10, true, false);
reed@android.com6b82d1a2009-06-03 02:35:01 +0000215 canvas->translate(SkIntToScalar(180), 0);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000216 patch->draw(canvas, paint, 10, 10, false, true);
reed@android.com6b82d1a2009-06-03 02:35:01 +0000217 canvas->translate(SkIntToScalar(180), 0);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000218 patch->draw(canvas, paint, 10, 10, true, true);
219}
220
mike@reedtribe.org5fd92432011-05-05 01:59:48 +0000221class PatchView : public SampleView {
reed@android.com8a1c16f2008-12-17 15:59:43 +0000222 SkShader* fShader0;
223 SkShader* fShader1;
224 SkIPoint fSize0, fSize1;
225 SkPoint fPts[12];
reed@google.com82065d62011-02-07 15:30:46 +0000226
227public:
rmistry@google.comae933ce2012-08-23 18:19:56 +0000228 PatchView() {
reed@android.com8a1c16f2008-12-17 15:59:43 +0000229 fShader0 = make_shader0(&fSize0);
230 fSize1 = fSize0;
231 if (fSize0.fX == 0 || fSize0.fY == 0) {
232 fSize1.set(2, 2);
233 }
234 fShader1 = make_shader1(fSize1);
235
reed@android.com6b82d1a2009-06-03 02:35:01 +0000236 const SkScalar S = SkIntToScalar(50);
237 const SkScalar T = SkIntToScalar(40);
238 fPts[0].set(S*0, T);
239 fPts[1].set(S*1, T);
240 fPts[2].set(S*2, T);
241 fPts[3].set(S*3, T);
242 fPts[4].set(S*3, T*2);
243 fPts[5].set(S*3, T*3);
244 fPts[6].set(S*3, T*4);
245 fPts[7].set(S*2, T*4);
246 fPts[8].set(S*1, T*4);
247 fPts[9].set(S*0, T*4);
248 fPts[10].set(S*0, T*3);
249 fPts[11].set(S*0, T*2);
mike@reedtribe.org5fd92432011-05-05 01:59:48 +0000250
251 this->setBGColor(SK_ColorGRAY);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000252 }
reed@google.com82065d62011-02-07 15:30:46 +0000253
reed@android.com8a1c16f2008-12-17 15:59:43 +0000254 virtual ~PatchView() {
reed@google.com82065d62011-02-07 15:30:46 +0000255 SkSafeUnref(fShader0);
256 SkSafeUnref(fShader1);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000257 }
reed@google.com82065d62011-02-07 15:30:46 +0000258
reed@android.com8a1c16f2008-12-17 15:59:43 +0000259protected:
260 // overrides from SkEventSink
261 virtual bool onQuery(SkEvent* evt) {
tfarina@chromium.org45369a32012-09-30 11:30:01 +0000262 if (SampleCode::TitleQ(*evt)) {
263 SampleCode::TitleR(evt, "Patch");
reed@android.com8a1c16f2008-12-17 15:59:43 +0000264 return true;
265 }
266 return this->INHERITED::onQuery(evt);
267 }
reed@google.com82065d62011-02-07 15:30:46 +0000268
mike@reedtribe.org5fd92432011-05-05 01:59:48 +0000269 virtual void onDrawContent(SkCanvas* canvas) {
reed@android.com8a1c16f2008-12-17 15:59:43 +0000270 SkPaint paint;
271 paint.setDither(true);
reed@google.com44699382013-10-31 17:28:30 +0000272 paint.setFilterLevel(SkPaint::kLow_FilterLevel);
reed@google.com82065d62011-02-07 15:30:46 +0000273
reed@android.com6b82d1a2009-06-03 02:35:01 +0000274 canvas->translate(SkIntToScalar(20), 0);
275
reed@android.com8a1c16f2008-12-17 15:59:43 +0000276 Patch patch;
reed@google.com82065d62011-02-07 15:30:46 +0000277
reed@android.com8a1c16f2008-12-17 15:59:43 +0000278 paint.setShader(fShader0);
279 if (fSize0.fX == 0) {
280 fSize0.fX = 1;
281 }
282 if (fSize0.fY == 0) {
283 fSize0.fY = 1;
284 }
285 patch.setBounds(fSize0.fX, fSize0.fY);
reed@google.com82065d62011-02-07 15:30:46 +0000286
287 patch.setPatch(fPts);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000288 drawpatches(canvas, paint, 10, 10, &patch);
reed@google.com82065d62011-02-07 15:30:46 +0000289
reed@android.com8a1c16f2008-12-17 15:59:43 +0000290 paint.setShader(NULL);
291 paint.setAntiAlias(true);
292 paint.setStrokeWidth(SkIntToScalar(5));
reed@android.comf2b98d62010-12-20 18:26:13 +0000293 canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint);
reed@google.com82065d62011-02-07 15:30:46 +0000294
reed@android.com8a1c16f2008-12-17 15:59:43 +0000295 canvas->translate(0, SkIntToScalar(300));
reed@google.com82065d62011-02-07 15:30:46 +0000296
reed@android.com8a1c16f2008-12-17 15:59:43 +0000297 paint.setAntiAlias(false);
298 paint.setShader(fShader1);
299 patch.setBounds(fSize1.fX, fSize1.fY);
300 drawpatches(canvas, paint, 10, 10, &patch);
301 }
reed@google.com82065d62011-02-07 15:30:46 +0000302
reed@android.com8a1c16f2008-12-17 15:59:43 +0000303 class PtClick : public Click {
304 public:
305 int fIndex;
306 PtClick(SkView* view, int index) : Click(view), fIndex(index) {}
307 };
reed@google.com82065d62011-02-07 15:30:46 +0000308
reed@android.com8a1c16f2008-12-17 15:59:43 +0000309 static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) {
310 return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5);
311 }
reed@google.com82065d62011-02-07 15:30:46 +0000312
reed@google.com4d5c26d2013-01-08 16:17:50 +0000313 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
314 unsigned modi) SK_OVERRIDE {
senorblanco@chromium.org64cc5792011-05-19 19:58:58 +0000315 for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
reed@android.com8a1c16f2008-12-17 15:59:43 +0000316 if (hittest(fPts[i], x, y)) {
reed@google.com7fa2a652014-01-27 13:42:58 +0000317 return new PtClick(this, (int)i);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000318 }
319 }
reed@google.com4d5c26d2013-01-08 16:17:50 +0000320 return this->INHERITED::onFindClickHandler(x, y, modi);
reed@android.com8a1c16f2008-12-17 15:59:43 +0000321 }
reed@google.com82065d62011-02-07 15:30:46 +0000322
reed@android.com8a1c16f2008-12-17 15:59:43 +0000323 virtual bool onClick(Click* click) {
324 fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY);
325 this->inval(NULL);
326 return true;
327 }
reed@google.com82065d62011-02-07 15:30:46 +0000328
reed@android.com8a1c16f2008-12-17 15:59:43 +0000329private:
mike@reedtribe.org5fd92432011-05-05 01:59:48 +0000330 typedef SampleView INHERITED;
reed@android.com8a1c16f2008-12-17 15:59:43 +0000331};
332
333//////////////////////////////////////////////////////////////////////////////
334
335static SkView* MyFactory() { return new PatchView; }
336static SkViewRegister reg(MyFactory);