reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 1 | #include "SampleCode.h" |
| 2 | #include "SkView.h" |
| 3 | #include "SkCanvas.h" |
| 4 | #include "SkGradientShader.h" |
| 5 | #include "SkPath.h" |
| 6 | #include "SkRegion.h" |
| 7 | #include "SkShader.h" |
| 8 | #include "SkUtils.h" |
| 9 | #include "SkImageDecoder.h" |
| 10 | |
reed@android.com | 4408cca | 2009-10-27 02:24:03 +0000 | [diff] [blame^] | 11 | static SkPoint SkMakePoint(SkScalar x, SkScalar y) { |
| 12 | SkPoint pt; |
| 13 | pt.set(x, y); |
| 14 | return pt; |
| 15 | } |
| 16 | |
| 17 | static SkPoint SkPointInterp(const SkPoint& a, const SkPoint& b, SkScalar t) { |
| 18 | return SkMakePoint(SkScalarInterp(a.fX, b.fX, t), |
| 19 | SkScalarInterp(a.fY, b.fY, t)); |
| 20 | } |
| 21 | |
| 22 | #include "SkBoundaryPatch.h" |
| 23 | |
| 24 | static void set_pts(SkPoint pts[], int R, int C, SkBoundaryPatch* patch) { |
| 25 | SkScalar invR = SkScalarInvert(SkIntToScalar(R - 1)); |
| 26 | SkScalar invC = SkScalarInvert(SkIntToScalar(C - 1)); |
| 27 | |
| 28 | for (int y = 0; y < C; y++) { |
| 29 | SkScalar yy = y * invC; |
| 30 | for (int x = 0; x < R; x++) { |
| 31 | *pts++ = patch->evaluate(x * invR, yy); |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static void set_cubic(SkPoint pts[4], SkScalar x0, SkScalar y0, |
| 37 | SkScalar x3, SkScalar y3, SkScalar scale = 1) { |
| 38 | SkPoint tmp, tmp2; |
| 39 | |
| 40 | pts[0].set(x0, y0); |
| 41 | pts[3].set(x3, y3); |
| 42 | |
| 43 | tmp = SkPointInterp(pts[0], pts[3], SK_Scalar1/3); |
| 44 | tmp2 = pts[0] - tmp; |
| 45 | tmp2.rotateCW(); |
| 46 | tmp2.scale(scale); |
| 47 | pts[1] = tmp + tmp2; |
| 48 | |
| 49 | tmp = SkPointInterp(pts[0], pts[3], 2*SK_Scalar1/3); |
| 50 | tmp2 = pts[3] - tmp; |
| 51 | tmp2.rotateCW(); |
| 52 | tmp2.scale(scale); |
| 53 | pts[2] = tmp + tmp2; |
| 54 | } |
| 55 | |
| 56 | static void draw_texture(SkCanvas* canvas, const SkPoint verts[], int R, int C, |
| 57 | const SkBitmap& texture) { |
| 58 | int vertCount = R * C; |
| 59 | const int rows = R - 1; |
| 60 | const int cols = C - 1; |
| 61 | int idxCount = rows * cols * 6; |
| 62 | |
| 63 | SkAutoTArray<SkPoint> texStorage(vertCount); |
| 64 | SkPoint* tex = texStorage.get(); |
| 65 | SkAutoTArray<uint16_t> idxStorage(idxCount); |
| 66 | uint16_t* idx = idxStorage.get(); |
| 67 | |
| 68 | |
| 69 | const SkScalar dtx = texture.width() / rows; |
| 70 | const SkScalar dty = texture.height() / cols; |
| 71 | int index = 0; |
| 72 | for (int y = 0; y <= cols; y++) { |
| 73 | for (int x = 0; x <= rows; x++) { |
| 74 | tex->set(x*dtx, y*dty); |
| 75 | tex += 1; |
| 76 | |
| 77 | if (y < cols && x < rows) { |
| 78 | *idx++ = index; |
| 79 | *idx++ = index + rows + 1; |
| 80 | *idx++ = index + 1; |
| 81 | |
| 82 | *idx++ = index + 1; |
| 83 | *idx++ = index + rows + 1; |
| 84 | *idx++ = index + rows + 2; |
| 85 | |
| 86 | index += 1; |
| 87 | } |
| 88 | } |
| 89 | index += 1; |
| 90 | } |
| 91 | |
| 92 | SkPaint paint; |
| 93 | paint.setShader(SkShader::CreateBitmapShader(texture, |
| 94 | SkShader::kClamp_TileMode, |
| 95 | SkShader::kClamp_TileMode))->unref(); |
| 96 | |
| 97 | canvas->drawVertices(SkCanvas::kTriangles_VertexMode, vertCount, verts, |
| 98 | texStorage.get(), NULL, NULL, idxStorage.get(), |
| 99 | idxCount, paint); |
| 100 | } |
| 101 | |
| 102 | static void test_patch(SkCanvas* canvas, const SkBitmap& bm, SkScalar scale) { |
| 103 | SkCubicBoundaryCurve L, T, R, B; |
| 104 | |
| 105 | set_cubic(L.fPts, 0, 0, 0, 100, scale); |
| 106 | set_cubic(T.fPts, 0, 0, 100, 0, scale); |
| 107 | set_cubic(R.fPts, 100, 0, 100, 100, -scale); |
| 108 | set_cubic(B.fPts, 0, 100, 100, 100, 0); |
| 109 | |
| 110 | SkBoundaryPatch patch; |
| 111 | patch.setCurve(SkBoundaryPatch::kLeft, &L); |
| 112 | patch.setCurve(SkBoundaryPatch::kTop, &T); |
| 113 | patch.setCurve(SkBoundaryPatch::kRight, &R); |
| 114 | patch.setCurve(SkBoundaryPatch::kBottom, &B); |
| 115 | |
| 116 | const int Rows = 25; |
| 117 | const int Cols = 25; |
| 118 | SkPoint pts[Rows * Cols]; |
| 119 | set_pts(pts, Rows, Cols, &patch); |
| 120 | |
| 121 | SkPaint paint; |
| 122 | paint.setAntiAlias(true); |
| 123 | paint.setStrokeWidth(1); |
| 124 | paint.setStrokeCap(SkPaint::kRound_Cap); |
| 125 | |
| 126 | canvas->translate(50, 50); |
| 127 | canvas->scale(3, 3); |
| 128 | |
| 129 | draw_texture(canvas, pts, Rows, Cols, bm); |
| 130 | // canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(pts), |
| 131 | // pts, paint); |
| 132 | } |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 133 | |
| 134 | /////////////////////////////////////////////////////////////////////////////// |
| 135 | |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 136 | class Mesh { |
| 137 | public: |
| 138 | Mesh(); |
| 139 | ~Mesh(); |
| 140 | |
| 141 | Mesh& operator=(const Mesh& src); |
| 142 | |
| 143 | void init(const SkRect& bounds, int rows, int cols, |
| 144 | const SkRect& texture); |
| 145 | |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 146 | const SkRect& bounds() const { return fBounds; } |
| 147 | |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 148 | int rows() const { return fRows; } |
| 149 | int cols() const { return fCols; } |
| 150 | SkPoint& pt(int row, int col) { |
| 151 | return fPts[row * (fRows + 1) + col]; |
| 152 | } |
| 153 | |
| 154 | void draw(SkCanvas*, const SkPaint&); |
| 155 | void drawWireframe(SkCanvas* canvas, const SkPaint& paint); |
| 156 | |
| 157 | private: |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 158 | SkRect fBounds; |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 159 | int fRows, fCols; |
| 160 | SkPoint* fPts; |
| 161 | SkPoint* fTex; // just points into fPts, not separately allocated |
| 162 | int fCount; |
| 163 | uint16_t* fIndices; |
| 164 | int fIndexCount; |
| 165 | }; |
| 166 | |
| 167 | Mesh::Mesh() : fPts(NULL), fCount(0), fIndices(NULL), fIndexCount(0) {} |
| 168 | |
| 169 | Mesh::~Mesh() { |
| 170 | delete[] fPts; |
| 171 | delete[] fIndices; |
| 172 | } |
| 173 | |
| 174 | Mesh& Mesh::operator=(const Mesh& src) { |
| 175 | delete[] fPts; |
| 176 | delete[] fIndices; |
| 177 | |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 178 | fBounds = src.fBounds; |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 179 | fRows = src.fRows; |
| 180 | fCols = src.fCols; |
| 181 | |
| 182 | fCount = src.fCount; |
| 183 | fPts = new SkPoint[fCount * 2]; |
| 184 | fTex = fPts + fCount; |
| 185 | memcpy(fPts, src.fPts, fCount * 2 * sizeof(SkPoint)); |
| 186 | |
| 187 | delete[] fIndices; |
| 188 | fIndexCount = src.fIndexCount; |
| 189 | fIndices = new uint16_t[fIndexCount]; |
| 190 | memcpy(fIndices, src.fIndices, fIndexCount * sizeof(uint16_t)); |
| 191 | |
| 192 | return *this; |
| 193 | } |
| 194 | |
| 195 | void Mesh::init(const SkRect& bounds, int rows, int cols, |
| 196 | const SkRect& texture) { |
| 197 | SkASSERT(rows > 0 && cols > 0); |
| 198 | |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 199 | fBounds = bounds; |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 200 | fRows = rows; |
| 201 | fCols = cols; |
| 202 | |
| 203 | delete[] fPts; |
| 204 | fCount = (rows + 1) * (cols + 1); |
| 205 | fPts = new SkPoint[fCount * 2]; |
| 206 | fTex = fPts + fCount; |
| 207 | |
| 208 | delete[] fIndices; |
| 209 | fIndexCount = rows * cols * 6; |
| 210 | fIndices = new uint16_t[fIndexCount]; |
| 211 | |
| 212 | SkPoint* pts = fPts; |
| 213 | const SkScalar dx = bounds.width() / rows; |
| 214 | const SkScalar dy = bounds.height() / cols; |
| 215 | SkPoint* tex = fTex; |
| 216 | const SkScalar dtx = texture.width() / rows; |
| 217 | const SkScalar dty = texture.height() / cols; |
| 218 | uint16_t* idx = fIndices; |
| 219 | int index = 0; |
| 220 | for (int y = 0; y <= cols; y++) { |
| 221 | for (int x = 0; x <= rows; x++) { |
| 222 | pts->set(bounds.fLeft + x*dx, bounds.fTop + y*dy); |
| 223 | pts += 1; |
| 224 | tex->set(texture.fLeft + x*dtx, texture.fTop + y*dty); |
| 225 | tex += 1; |
| 226 | |
| 227 | if (y < cols && x < rows) { |
| 228 | *idx++ = index; |
| 229 | *idx++ = index + rows + 1; |
| 230 | *idx++ = index + 1; |
| 231 | |
| 232 | *idx++ = index + 1; |
| 233 | *idx++ = index + rows + 1; |
| 234 | *idx++ = index + rows + 2; |
| 235 | |
| 236 | index += 1; |
| 237 | } |
| 238 | } |
| 239 | index += 1; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | void Mesh::draw(SkCanvas* canvas, const SkPaint& paint) { |
| 244 | canvas->drawVertices(SkCanvas::kTriangles_VertexMode, fCount, |
| 245 | fPts, fTex, NULL, NULL, fIndices, fIndexCount, |
| 246 | paint); |
| 247 | } |
| 248 | |
| 249 | void Mesh::drawWireframe(SkCanvas* canvas, const SkPaint& paint) { |
| 250 | canvas->drawVertices(SkCanvas::kTriangles_VertexMode, fCount, |
| 251 | fPts, NULL, NULL, NULL, fIndices, fIndexCount, |
| 252 | paint); |
| 253 | } |
| 254 | |
| 255 | /////////////////////////////////////////////////////////////////////////////// |
| 256 | |
reed@android.com | 4408cca | 2009-10-27 02:24:03 +0000 | [diff] [blame^] | 257 | static SkScalar gScale = 0; |
| 258 | static SkScalar gDScale = 0.01; |
| 259 | |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 260 | class WarpView : public SkView { |
| 261 | Mesh fMesh, fOrig; |
| 262 | SkBitmap fBitmap; |
| 263 | public: |
| 264 | WarpView() { |
| 265 | SkBitmap bm; |
reed@android.com | 4408cca | 2009-10-27 02:24:03 +0000 | [diff] [blame^] | 266 | // SkImageDecoder::DecodeFile("/skimages/beach.jpg", &bm); |
| 267 | SkImageDecoder::DecodeFile("/beach_shot.JPG", &bm); |
| 268 | fBitmap = bm; |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 269 | |
| 270 | SkRect bounds, texture; |
| 271 | texture.set(0, 0, SkIntToScalar(fBitmap.width()), |
| 272 | SkIntToScalar(fBitmap.height())); |
| 273 | bounds = texture; |
| 274 | |
| 275 | // fMesh.init(bounds, fBitmap.width() / 40, fBitmap.height() / 40, texture); |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 276 | fMesh.init(bounds, 30, 30, texture); |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 277 | fOrig = fMesh; |
| 278 | } |
| 279 | |
| 280 | protected: |
| 281 | // overrides from SkEventSink |
| 282 | virtual bool onQuery(SkEvent* evt) { |
| 283 | if (SampleCode::TitleQ(*evt)) { |
| 284 | SampleCode::TitleR(evt, "Warp"); |
| 285 | return true; |
| 286 | } |
| 287 | return this->INHERITED::onQuery(evt); |
| 288 | } |
| 289 | |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 290 | static SkPoint make_pt(SkScalar x, SkScalar y) { |
| 291 | SkPoint pt; |
| 292 | pt.set(x, y); |
| 293 | return pt; |
| 294 | } |
| 295 | |
| 296 | static SkScalar mapx0(SkScalar min, SkScalar max, SkScalar x0, SkScalar x1, |
| 297 | SkScalar x) { |
| 298 | if (x < x0) { |
| 299 | SkASSERT(x0 > min); |
| 300 | return x1 - SkScalarMulDiv(x1 - min, x0 - x, x0 - min); |
| 301 | } else { |
| 302 | SkASSERT(max > x0); |
| 303 | return x1 + SkScalarMulDiv(max - x1, x - x0, max - x0); |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | static SkScalar mapx1(SkScalar min, SkScalar max, SkScalar x0, SkScalar x1, |
| 308 | SkScalar x) { |
| 309 | SkScalar newx; |
| 310 | if (x < x0) { |
| 311 | SkASSERT(x0 > min); |
| 312 | newx = x1 - SkScalarMulDiv(x1 - min, x0 - x, x0 - min); |
| 313 | } else { |
| 314 | SkASSERT(max > x0); |
| 315 | newx = x1 + SkScalarMulDiv(max - x1, x - x0, max - x0); |
| 316 | } |
| 317 | return x + (newx - x) * 0.5f; |
| 318 | } |
| 319 | |
| 320 | static SkPoint mappt(const SkRect& r, const SkPoint& p0, const SkPoint& p1, |
| 321 | const SkPoint& pt) { |
| 322 | return make_pt(mapx0(r.fLeft, r.fRight, p0.fX, p1.fX, pt.fX), |
| 323 | mapx0(r.fTop, r.fBottom, p0.fY, p1.fY, pt.fY)); |
| 324 | } |
| 325 | |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 326 | void warp(const SkPoint& p0, const SkPoint& p1) { |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 327 | const SkRect& bounds = fOrig.bounds(); |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 328 | int rows = fMesh.rows(); |
| 329 | int cols = fMesh.cols(); |
| 330 | |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 331 | SkRect r = bounds; |
| 332 | r.inset(bounds.width() / 256, bounds.height() / 256); |
| 333 | if (r.contains(p0)) { |
| 334 | for (int y = 1; y < cols; y++) { |
| 335 | for (int x = 1; x < rows; x++) { |
| 336 | fMesh.pt(x, y) = mappt(bounds, p0, p1, fOrig.pt(x, y)); |
| 337 | } |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | virtual void onDraw(SkCanvas* canvas) { |
| 343 | canvas->drawColor(SK_ColorGRAY); |
| 344 | |
| 345 | SkPaint paint; |
| 346 | paint.setFilterBitmap(true); |
| 347 | paint.setShader(SkShader::CreateBitmapShader(fBitmap, |
| 348 | SkShader::kClamp_TileMode, |
| 349 | SkShader::kClamp_TileMode))->unref(); |
reed@android.com | 4408cca | 2009-10-27 02:24:03 +0000 | [diff] [blame^] | 350 | // fMesh.draw(canvas, paint); |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 351 | |
| 352 | paint.setShader(NULL); |
| 353 | paint.setColor(SK_ColorRED); |
reed@android.com | 80b4ebe | 2009-10-21 19:41:10 +0000 | [diff] [blame] | 354 | // fMesh.draw(canvas, paint); |
reed@android.com | 4408cca | 2009-10-27 02:24:03 +0000 | [diff] [blame^] | 355 | |
| 356 | test_patch(canvas, fBitmap, gScale); |
| 357 | gScale += gDScale; |
| 358 | if (gScale > 2) { |
| 359 | gDScale = -gDScale; |
| 360 | } else if (gScale < -2) { |
| 361 | gDScale = -gDScale; |
| 362 | } |
| 363 | this->inval(NULL); |
reed@android.com | d2abab6 | 2009-10-20 21:27:15 +0000 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { |
| 367 | return new Click(this); |
| 368 | } |
| 369 | |
| 370 | virtual bool onClick(Click* click) { |
| 371 | this->warp(click->fOrig, click->fCurr); |
| 372 | this->inval(NULL); |
| 373 | return true; |
| 374 | } |
| 375 | |
| 376 | private: |
| 377 | SkIRect fBase, fRect; |
| 378 | |
| 379 | typedef SkView INHERITED; |
| 380 | }; |
| 381 | |
| 382 | ////////////////////////////////////////////////////////////////////////////// |
| 383 | |
| 384 | static SkView* MyFactory() { return new WarpView; } |
| 385 | static SkViewRegister reg(MyFactory); |
| 386 | |