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 "Sample.h" 9 #include "SkAnimTimer.h" 10 #include "SkBitmap.h" 11 #include "SkCanvas.h" 12 #include "SkFont.h" 13 #include "SkGradientShader.h" 14 #include "SkGraphics.h" 15 #include "SkPath.h" 16 #include "SkRegion.h" 17 #include "SkShader.h" 18 #include "SkUTF.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 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 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 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 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 Sample { 68 SkPoint fSrcPts[2]; 69 SkPoint fSrcVec[2]; 70 SkRect fSrcLimit; 71 SkRect fDstR[2]; 72 73 void bounce() { 74 bounce_pt(&fSrcPts[0], &fSrcVec[0], fSrcLimit); 75 bounce_pt(&fSrcPts[1], &fSrcVec[1], fSrcLimit); 76 } 77 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: 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: 105 bool onQuery(Sample::Event* evt) override { 106 if (Sample::TitleQ(*evt)) { 107 Sample::TitleR(evt, "BitmapRect"); 108 return true; 109 } 110 return this->INHERITED::onQuery(evt); 111 } 112 113 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 } 138 139 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 Sample INHERITED; 150 }; 151 152 ////////////////////////////////////////////////////////////////////////////// 153 154 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 SkFont font; 165 font.setSize(SkIntToScalar(BIG_H)); 166 167 const int BIG_W = SkScalarRoundToInt(font.measureText(gText, strlen(gText), kUTF8_SkTextEncoding)); 168 169 bm->allocN32Pixels(BIG_W, BIG_H); 170 bm->eraseColor(SK_ColorWHITE); 171 172 SkCanvas canvas(*bm); 173 174 canvas.drawSimpleText(gText, strlen(gText), kUTF8_SkTextEncoding, 0, font.getSize()*4/5, font, SkPaint()); 175 } 176 177 class BitmapRectView2 : public Sample { 178 SkBitmap fBitmap; 179 180 SkRect fSrcR; 181 SkRect fLimitR; 182 SkScalar fDX; 183 SkRect fDstR[2]; 184 185 void bounceMe() { 186 SkScalar width = fSrcR.width(); 187 bounce(&fSrcR.fLeft, &fDX, fLimitR.fLeft, fLimitR.fRight - width); 188 fSrcR.fRight = fSrcR.fLeft + width; 189 } 190 191 void resetBounce() { 192 fSrcR.iset(0, 0, fBitmap.height() * 3, fBitmap.height()); 193 fDX = SK_Scalar1; 194 } 195 196 public: 197 BitmapRectView2() { } 198 199 protected: 200 bool onQuery(Sample::Event* evt) override { 201 if (Sample::TitleQ(*evt)) { 202 Sample::TitleR(evt, "BigBitmapRect"); 203 return true; 204 } 205 return this->INHERITED::onQuery(evt); 206 } 207 208 void onOnceBeforeDraw() override { 209 make_big_bitmap(&fBitmap); 210 211 this->setBGColor(SK_ColorGRAY); 212 213 this->resetBounce(); 214 215 fLimitR.iset(0, 0, fBitmap.width(), fBitmap.height()); 216 217 fDstR[0] = SkRect::MakeXYWH(20, 20, 600, 200); 218 fDstR[1] = fDstR[0]; 219 fDstR[1].offset(0, fDstR[0].height() * 5/4); 220 } 221 222 void onDrawContent(SkCanvas* canvas) override { 223 SkPaint paint; 224 paint.setStyle(SkPaint::kStroke_Style); 225 paint.setColor(SK_ColorYELLOW); 226 227 for (int i = 0; i < 2; ++i) { 228 paint.setFilterQuality(1 == i ? kLow_SkFilterQuality : kNone_SkFilterQuality); 229 canvas->drawBitmapRect(fBitmap, fSrcR, fDstR[i], &paint, 230 SkCanvas::kStrict_SrcRectConstraint); 231 canvas->drawRect(fDstR[i], paint); 232 } 233 } 234 235 bool onAnimate(const SkAnimTimer& timer) override { 236 if (timer.isStopped()) { 237 this->resetBounce(); 238 } else if (timer.isRunning()) { 239 this->bounceMe(); 240 } 241 return true; 242 } 243 244 private: 245 typedef Sample INHERITED; 246 }; 247 248 ////////////////////////////////////////////////////////////////////////////// 249 250 DEF_SAMPLE( return new BitmapRectView(); ) 251 DEF_SAMPLE( return new BitmapRectView2(); ) 252
