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.h"
9 #include "SkAnimTimer.h"
10 #include "SkView.h"
11 #include "SkBitmap.h"
12 #include "SkCanvas.h"
13 #include "SkGradientShader.h"
14 #include "SkGraphics.h"
15 #include "SkPath.h"
16 #include "SkRegion.h"
17 #include "SkShader.h"
18 #include "SkUtils.h"
19 #include "SkColorPriv.h"
20 #include "SkColorFilter.h"
21 #include "SkTime.h"
22 #include "SkTypeface.h"
23
24 #include "SkOSFile.h"
25 #include "SkStream.h"
26
27 #define INT_SIZE 64
28 #define SCALAR_SIZE SkIntToScalar(INT_SIZE)
29
make_bitmap(SkBitmap * bitmap)30 static void make_bitmap(SkBitmap* bitmap) {
31 bitmap->allocN32Pixels(INT_SIZE, INT_SIZE);
32 SkCanvas canvas(*bitmap);
33
34 canvas.drawColor(SK_ColorRED);
35 SkPaint paint;
36 paint.setAntiAlias(true);
37 const SkPoint pts[] = { { 0, 0 }, { SCALAR_SIZE, SCALAR_SIZE } };
38 const SkColor colors[] = { SK_ColorWHITE, SK_ColorBLUE };
39 paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
40 SkShader::kClamp_TileMode));
41 canvas.drawCircle(SCALAR_SIZE/2, SCALAR_SIZE/2, SCALAR_SIZE/2, paint);
42 }
43
unit_vec(int degrees)44 static SkPoint unit_vec(int degrees) {
45 SkScalar rad = SkDegreesToRadians(SkIntToScalar(degrees));
46 SkScalar s, c;
47 s = SkScalarSinCos(rad, &c);
48 return SkPoint::Make(c, s);
49 }
50
bounce(SkScalar * value,SkScalar * delta,SkScalar min,SkScalar max)51 static void bounce(SkScalar* value, SkScalar* delta, SkScalar min, SkScalar max) {
52 *value += *delta;
53 if (*value < min) {
54 *value = min;
55 *delta = - *delta;
56 } else if (*value > max) {
57 *value = max;
58 *delta = - *delta;
59 }
60 }
61
bounce_pt(SkPoint * pt,SkVector * vec,const SkRect & limit)62 static void bounce_pt(SkPoint* pt, SkVector* vec, const SkRect& limit) {
63 bounce(&pt->fX, &vec->fX, limit.fLeft, limit.fRight);
64 bounce(&pt->fY, &vec->fY, limit.fTop, limit.fBottom);
65 }
66
67 class BitmapRectView : public SampleView {
68 SkPoint fSrcPts[2];
69 SkPoint fSrcVec[2];
70 SkRect fSrcLimit;
71 SkRect fDstR[2];
72
bounce()73 void bounce() {
74 bounce_pt(&fSrcPts[0], &fSrcVec[0], fSrcLimit);
75 bounce_pt(&fSrcPts[1], &fSrcVec[1], fSrcLimit);
76 }
77
resetBounce()78 void resetBounce() {
79 fSrcPts[0].set(0, 0);
80 fSrcPts[1].set(SCALAR_SIZE, SCALAR_SIZE);
81
82 fSrcVec[0] = unit_vec(30);
83 fSrcVec[1] = unit_vec(107);
84 }
85
86 public:
BitmapRectView()87 BitmapRectView() {
88 this->setBGColor(SK_ColorGRAY);
89
90 this->resetBounce();
91
92 fSrcLimit.set(-SCALAR_SIZE/4, -SCALAR_SIZE/4,
93 SCALAR_SIZE*5/4, SCALAR_SIZE*5/4);
94
95 fDstR[0] = SkRect::MakeXYWH(SkIntToScalar(10), SkIntToScalar(100),
96 SkIntToScalar(250), SkIntToScalar(300));
97 fDstR[1] = fDstR[0];
98 fDstR[1].offset(fDstR[0].width() * 5/4, 0);
99
100 fSrcPts[0].set(32, 32);
101 fSrcPts[1].set(90, 90);
102 }
103
104 protected:
onQuery(SkEvent * evt)105 bool onQuery(SkEvent* evt) override {
106 if (SampleCode::TitleQ(*evt)) {
107 SampleCode::TitleR(evt, "BitmapRect");
108 return true;
109 }
110 return this->INHERITED::onQuery(evt);
111 }
112
onDrawContent(SkCanvas * canvas)113 void onDrawContent(SkCanvas* canvas) override {
114 SkRect srcR;
115 srcR.set(fSrcPts[0], fSrcPts[1]);
116 srcR = SkRect::MakeXYWH(fSrcPts[0].fX, fSrcPts[0].fY, 32, 32);
117 srcR.offset(-srcR.width()/2, -srcR.height()/2);
118
119 SkPaint paint;
120 paint.setStyle(SkPaint::kStroke_Style);
121 paint.setColor(SK_ColorYELLOW);
122
123 SkBitmap bitmap;
124 make_bitmap(&bitmap);
125
126 canvas->translate(20, 20);
127
128 canvas->drawBitmap(bitmap, 0, 0, &paint);
129 canvas->drawRect(srcR, paint);
130
131 for (int i = 0; i < 2; ++i) {
132 paint.setFilterQuality(1 == i ? kLow_SkFilterQuality : kNone_SkFilterQuality);
133 canvas->drawBitmapRect(bitmap, srcR, fDstR[i], &paint,
134 SkCanvas::kStrict_SrcRectConstraint);
135 canvas->drawRect(fDstR[i], paint);
136 }
137 }
138
onAnimate(const SkAnimTimer & timer)139 bool onAnimate(const SkAnimTimer& timer) override {
140 if (timer.isStopped()) {
141 this->resetBounce();
142 } else if (timer.isRunning()) {
143 this->bounce();
144 }
145 return true;
146 }
147
148 private:
149 typedef SampleView INHERITED;
150 };
151
152 //////////////////////////////////////////////////////////////////////////////
153
make_big_bitmap(SkBitmap * bm)154 static void make_big_bitmap(SkBitmap* bm) {
155 static const char gText[] =
156 "We the people, in order to form a more perfect union, establish justice,"
157 " ensure domestic tranquility, provide for the common defense, promote the"
158 " general welfare and ensure the blessings of liberty to ourselves and our"
159 " posterity, do ordain and establish this constitution for the United"
160 " States of America.";
161
162 const int BIG_H = 120;
163
164 SkPaint paint;
165 paint.setAntiAlias(true);
166 paint.setTextSize(SkIntToScalar(BIG_H));
167
168 const int BIG_W = SkScalarRoundToInt(paint.measureText(gText, strlen(gText)));
169
170 bm->allocN32Pixels(BIG_W, BIG_H);
171 bm->eraseColor(SK_ColorWHITE);
172
173 SkCanvas canvas(*bm);
174
175 canvas.drawString(gText, 0, paint.getTextSize()*4/5, paint);
176 }
177
178 class BitmapRectView2 : public SampleView {
179 SkBitmap fBitmap;
180
181 SkRect fSrcR;
182 SkRect fLimitR;
183 SkScalar fDX;
184 SkRect fDstR[2];
185
bounceMe()186 void bounceMe() {
187 SkScalar width = fSrcR.width();
188 bounce(&fSrcR.fLeft, &fDX, fLimitR.fLeft, fLimitR.fRight - width);
189 fSrcR.fRight = fSrcR.fLeft + width;
190 }
191
resetBounce()192 void resetBounce() {
193 fSrcR.iset(0, 0, fBitmap.height() * 3, fBitmap.height());
194 fDX = SK_Scalar1;
195 }
196
197 public:
BitmapRectView2()198 BitmapRectView2() {
199 make_big_bitmap(&fBitmap);
200
201 this->setBGColor(SK_ColorGRAY);
202
203 this->resetBounce();
204
205 fLimitR.iset(0, 0, fBitmap.width(), fBitmap.height());
206
207 fDstR[0] = SkRect::MakeXYWH(20, 20, 600, 200);
208 fDstR[1] = fDstR[0];
209 fDstR[1].offset(0, fDstR[0].height() * 5/4);
210 }
211
212 protected:
onQuery(SkEvent * evt)213 bool onQuery(SkEvent* evt) override {
214 if (SampleCode::TitleQ(*evt)) {
215 SampleCode::TitleR(evt, "BigBitmapRect");
216 return true;
217 }
218 return this->INHERITED::onQuery(evt);
219 }
220
onDrawContent(SkCanvas * canvas)221 void onDrawContent(SkCanvas* canvas) override {
222 SkPaint paint;
223 paint.setStyle(SkPaint::kStroke_Style);
224 paint.setColor(SK_ColorYELLOW);
225
226 for (int i = 0; i < 2; ++i) {
227 paint.setFilterQuality(1 == i ? kLow_SkFilterQuality : kNone_SkFilterQuality);
228 canvas->drawBitmapRect(fBitmap, fSrcR, fDstR[i], &paint,
229 SkCanvas::kStrict_SrcRectConstraint);
230 canvas->drawRect(fDstR[i], paint);
231 }
232 }
233
onAnimate(const SkAnimTimer & timer)234 bool onAnimate(const SkAnimTimer& timer) override {
235 if (timer.isStopped()) {
236 this->resetBounce();
237 } else if (timer.isRunning()) {
238 this->bounceMe();
239 }
240 return true;
241 }
242
243 private:
244 typedef SampleView INHERITED;
245 };
246
247 //////////////////////////////////////////////////////////////////////////////
248
F0()249 static SkView* F0() { return new BitmapRectView; }
F1()250 static SkView* F1() { return new BitmapRectView2; }
251 static SkViewRegister gR0(F0);
252 static SkViewRegister gR1(F1);
253