reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef SkPath_DEFINED |
| 18 | #define SkPath_DEFINED |
| 19 | |
| 20 | #include "SkMatrix.h" |
| 21 | #include "SkTDArray.h" |
| 22 | |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame^] | 23 | #ifdef ANDROID |
| 24 | #define GEN_ID_INC fGenerationID++ |
| 25 | #define GEN_ID_PTR_INC(ptr) ptr->fGenerationID++ |
| 26 | #else |
| 27 | #define GEN_ID_INC |
| 28 | #define GEN_ID_PTR_INC(ptr) |
| 29 | #endif |
| 30 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 31 | class SkFlattenableReadBuffer; |
| 32 | class SkFlattenableWriteBuffer; |
| 33 | class SkAutoPathBoundsUpdate; |
| 34 | class SkString; |
| 35 | |
| 36 | /** \class SkPath |
| 37 | |
| 38 | The SkPath class encapsulates compound (multiple contour) geometric paths |
| 39 | consisting of straight line segments, quadratic curves, and cubic curves. |
| 40 | */ |
ctguil@chromium.org | 7ffb1b2 | 2011-03-15 21:27:08 +0000 | [diff] [blame] | 41 | class SK_API SkPath { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 42 | public: |
| 43 | SkPath(); |
| 44 | SkPath(const SkPath&); |
| 45 | ~SkPath(); |
| 46 | |
| 47 | SkPath& operator=(const SkPath&); |
reed@android.com | 3abec1d | 2009-03-02 05:36:20 +0000 | [diff] [blame] | 48 | |
| 49 | friend bool operator==(const SkPath&, const SkPath&); |
| 50 | friend bool operator!=(const SkPath& a, const SkPath& b) { |
| 51 | return !(a == b); |
| 52 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 53 | |
| 54 | enum FillType { |
| 55 | /** Specifies that "inside" is computed by a non-zero sum of signed |
| 56 | edge crossings |
| 57 | */ |
| 58 | kWinding_FillType, |
| 59 | /** Specifies that "inside" is computed by an odd number of edge |
| 60 | crossings |
| 61 | */ |
| 62 | kEvenOdd_FillType, |
| 63 | /** Same as Winding, but draws outside of the path, rather than inside |
| 64 | */ |
| 65 | kInverseWinding_FillType, |
| 66 | /** Same as EvenOdd, but draws outside of the path, rather than inside |
| 67 | */ |
| 68 | kInverseEvenOdd_FillType |
| 69 | }; |
| 70 | |
| 71 | /** Return the path's fill type. This is used to define how "inside" is |
| 72 | computed. The default value is kWinding_FillType. |
| 73 | |
| 74 | @return the path's fill type |
| 75 | */ |
| 76 | FillType getFillType() const { return (FillType)fFillType; } |
| 77 | |
| 78 | /** Set the path's fill type. This is used to define how "inside" is |
| 79 | computed. The default value is kWinding_FillType. |
| 80 | |
| 81 | @param ft The new fill type for this path |
| 82 | */ |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame^] | 83 | void setFillType(FillType ft) { |
| 84 | fFillType = SkToU8(ft); |
| 85 | GEN_ID_INC; |
| 86 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 87 | |
| 88 | /** Returns true if the filltype is one of the Inverse variants */ |
| 89 | bool isInverseFillType() const { return (fFillType & 2) != 0; } |
| 90 | |
| 91 | /** Toggle between inverse and normal filltypes. This reverse the return |
| 92 | value of isInverseFillType() |
| 93 | */ |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame^] | 94 | void toggleInverseFillType() { |
| 95 | fFillType ^= 2; |
| 96 | GEN_ID_INC; |
| 97 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 98 | |
reed@android.com | 6b82d1a | 2009-06-03 02:35:01 +0000 | [diff] [blame] | 99 | /** Returns true if the path is flagged as being convex. This is not a |
| 100 | confirmed by any analysis, it is just the value set earlier. |
| 101 | */ |
deanm@chromium.org | 81aaa9d | 2009-06-18 14:46:03 +0000 | [diff] [blame] | 102 | bool isConvex() const { return fIsConvex != 0; } |
reed@android.com | 6b82d1a | 2009-06-03 02:35:01 +0000 | [diff] [blame] | 103 | |
| 104 | /** Set the isConvex flag to true or false. Convex paths may draw faster if |
| 105 | this flag is set, though setting this to true on a path that is in fact |
| 106 | not convex can give undefined results when drawn. Paths default to |
| 107 | isConvex == false |
| 108 | */ |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame^] | 109 | void setIsConvex(bool isConvex) { |
| 110 | fIsConvex = (isConvex != 0); |
| 111 | GEN_ID_INC; |
| 112 | } |
reed@android.com | 6b82d1a | 2009-06-03 02:35:01 +0000 | [diff] [blame] | 113 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 114 | /** Clear any lines and curves from the path, making it empty. This frees up |
| 115 | internal storage associated with those segments. |
reed@android.com | 6b82d1a | 2009-06-03 02:35:01 +0000 | [diff] [blame] | 116 | This does NOT change the fill-type setting nor isConvex |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 117 | */ |
| 118 | void reset(); |
| 119 | |
| 120 | /** Similar to reset(), in that all lines and curves are removed from the |
| 121 | path. However, any internal storage for those lines/curves is retained, |
| 122 | making reuse of the path potentially faster. |
reed@android.com | 6b82d1a | 2009-06-03 02:35:01 +0000 | [diff] [blame] | 123 | This does NOT change the fill-type setting nor isConvex |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 124 | */ |
| 125 | void rewind(); |
| 126 | |
| 127 | /** Returns true if the path is empty (contains no lines or curves) |
| 128 | |
| 129 | @return true if the path is empty (contains no lines or curves) |
| 130 | */ |
| 131 | bool isEmpty() const; |
| 132 | |
| 133 | /** Returns true if the path specifies a rectangle. If so, and if rect is |
| 134 | not null, set rect to the bounds of the path. If the path does not |
| 135 | specify a rectangle, return false and ignore rect. |
| 136 | |
| 137 | @param rect If not null, returns the bounds of the path if it specifies |
| 138 | a rectangle |
| 139 | @return true if the path specifies a rectangle |
| 140 | */ |
| 141 | bool isRect(SkRect* rect) const; |
| 142 | |
reed@android.com | d3aa4ff | 2010-02-09 16:38:45 +0000 | [diff] [blame] | 143 | /** Return the number of points in the path |
| 144 | */ |
| 145 | int countPoints() const { |
| 146 | return this->getPoints(NULL, 0); |
| 147 | } |
| 148 | |
| 149 | /** Return the point at the specified index. If the index is out of range |
| 150 | (i.e. is not 0 <= index < countPoints()) then the returned coordinates |
| 151 | will be (0,0) |
| 152 | */ |
| 153 | SkPoint getPoint(int index) const; |
| 154 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 155 | /** Returns the number of points in the path. Up to max points are copied. |
| 156 | |
| 157 | @param points If not null, receives up to max points |
| 158 | @param max The maximum number of points to copy into points |
| 159 | @return the actual number of points in the path |
| 160 | */ |
| 161 | int getPoints(SkPoint points[], int max) const; |
| 162 | |
| 163 | //! Swap contents of this and other. Guaranteed not to throw |
| 164 | void swap(SkPath& other); |
| 165 | |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 166 | /** Returns the bounds of the path's points. If the path contains 0 or 1 |
| 167 | points, the bounds is set to (0,0,0,0), and isEmpty() will return true. |
| 168 | Note: this bounds may be larger than the actual shape, since curves |
| 169 | do not extend as far as their control points. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 170 | */ |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 171 | const SkRect& getBounds() const { |
| 172 | if (fBoundsIsDirty) { |
| 173 | this->computeBounds(); |
| 174 | } |
| 175 | return fBounds; |
| 176 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 177 | |
| 178 | /** Calling this will, if the internal cache of the bounds is out of date, |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 179 | update it so that subsequent calls to getBounds will be instanteous. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 180 | This also means that any copies or simple transformations of the path |
| 181 | will inherit the cached bounds. |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 182 | */ |
| 183 | void updateBoundsCache() const { |
| 184 | // for now, just calling getBounds() is sufficient |
| 185 | this->getBounds(); |
| 186 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 187 | |
| 188 | // Construction methods |
| 189 | |
| 190 | /** Hint to the path to prepare for adding more points. This can allow the |
| 191 | path to more efficiently grow its storage. |
| 192 | |
| 193 | @param extraPtCount The number of extra points the path should |
| 194 | preallocate for. |
| 195 | */ |
| 196 | void incReserve(unsigned extraPtCount); |
| 197 | |
| 198 | /** Set the beginning of the next contour to the point (x,y). |
| 199 | |
| 200 | @param x The x-coordinate of the start of a new contour |
| 201 | @param y The y-coordinate of the start of a new contour |
| 202 | */ |
| 203 | void moveTo(SkScalar x, SkScalar y); |
| 204 | |
| 205 | /** Set the beginning of the next contour to the point |
| 206 | |
| 207 | @param p The start of a new contour |
| 208 | */ |
| 209 | void moveTo(const SkPoint& p) { |
| 210 | this->moveTo(p.fX, p.fY); |
| 211 | } |
| 212 | |
| 213 | /** Set the beginning of the next contour relative to the last point on the |
| 214 | previous contour. If there is no previous contour, this is treated the |
| 215 | same as moveTo(). |
| 216 | |
| 217 | @param dx The amount to add to the x-coordinate of the end of the |
| 218 | previous contour, to specify the start of a new contour |
| 219 | @param dy The amount to add to the y-coordinate of the end of the |
| 220 | previous contour, to specify the start of a new contour |
| 221 | */ |
| 222 | void rMoveTo(SkScalar dx, SkScalar dy); |
| 223 | |
| 224 | /** Add a line from the last point to the specified point (x,y). If no |
| 225 | moveTo() call has been made for this contour, the first point is |
| 226 | automatically set to (0,0). |
| 227 | |
| 228 | @param x The x-coordinate of the end of a line |
| 229 | @param y The y-coordinate of the end of a line |
| 230 | */ |
| 231 | void lineTo(SkScalar x, SkScalar y); |
| 232 | |
| 233 | /** Add a line from the last point to the specified point. If no moveTo() |
| 234 | call has been made for this contour, the first point is automatically |
| 235 | set to (0,0). |
| 236 | |
| 237 | @param p The end of a line |
| 238 | */ |
| 239 | void lineTo(const SkPoint& p) { |
| 240 | this->lineTo(p.fX, p.fY); |
| 241 | } |
| 242 | |
| 243 | /** Same as lineTo, but the coordinates are considered relative to the last |
| 244 | point on this contour. If there is no previous point, then a moveTo(0,0) |
| 245 | is inserted automatically. |
| 246 | |
| 247 | @param dx The amount to add to the x-coordinate of the previous point |
| 248 | on this contour, to specify a line |
| 249 | @param dy The amount to add to the y-coordinate of the previous point |
| 250 | on this contour, to specify a line |
| 251 | */ |
| 252 | void rLineTo(SkScalar dx, SkScalar dy); |
| 253 | |
| 254 | /** Add a quadratic bezier from the last point, approaching control point |
| 255 | (x1,y1), and ending at (x2,y2). If no moveTo() call has been made for |
| 256 | this contour, the first point is automatically set to (0,0). |
| 257 | |
| 258 | @param x1 The x-coordinate of the control point on a quadratic curve |
| 259 | @param y1 The y-coordinate of the control point on a quadratic curve |
| 260 | @param x2 The x-coordinate of the end point on a quadratic curve |
| 261 | @param y2 The y-coordinate of the end point on a quadratic curve |
| 262 | */ |
| 263 | void quadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2); |
| 264 | |
| 265 | /** Add a quadratic bezier from the last point, approaching control point |
| 266 | p1, and ending at p2. If no moveTo() call has been made for this |
| 267 | contour, the first point is automatically set to (0,0). |
| 268 | |
| 269 | @param p1 The control point on a quadratic curve |
| 270 | @param p2 The end point on a quadratic curve |
| 271 | */ |
| 272 | void quadTo(const SkPoint& p1, const SkPoint& p2) { |
| 273 | this->quadTo(p1.fX, p1.fY, p2.fX, p2.fY); |
| 274 | } |
| 275 | |
| 276 | /** Same as quadTo, but the coordinates are considered relative to the last |
| 277 | point on this contour. If there is no previous point, then a moveTo(0,0) |
| 278 | is inserted automatically. |
| 279 | |
| 280 | @param dx1 The amount to add to the x-coordinate of the last point on |
| 281 | this contour, to specify the control point of a quadratic curve |
| 282 | @param dy1 The amount to add to the y-coordinate of the last point on |
| 283 | this contour, to specify the control point of a quadratic curve |
| 284 | @param dx2 The amount to add to the x-coordinate of the last point on |
| 285 | this contour, to specify the end point of a quadratic curve |
| 286 | @param dy2 The amount to add to the y-coordinate of the last point on |
| 287 | this contour, to specify the end point of a quadratic curve |
| 288 | */ |
| 289 | void rQuadTo(SkScalar dx1, SkScalar dy1, SkScalar dx2, SkScalar dy2); |
| 290 | |
| 291 | /** Add a cubic bezier from the last point, approaching control points |
| 292 | (x1,y1) and (x2,y2), and ending at (x3,y3). If no moveTo() call has been |
| 293 | made for this contour, the first point is automatically set to (0,0). |
| 294 | |
| 295 | @param x1 The x-coordinate of the 1st control point on a cubic curve |
| 296 | @param y1 The y-coordinate of the 1st control point on a cubic curve |
| 297 | @param x2 The x-coordinate of the 2nd control point on a cubic curve |
| 298 | @param y2 The y-coordinate of the 2nd control point on a cubic curve |
| 299 | @param x3 The x-coordinate of the end point on a cubic curve |
| 300 | @param y3 The y-coordinate of the end point on a cubic curve |
| 301 | */ |
| 302 | void cubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| 303 | SkScalar x3, SkScalar y3); |
| 304 | |
| 305 | /** Add a cubic bezier from the last point, approaching control points p1 |
| 306 | and p2, and ending at p3. If no moveTo() call has been made for this |
| 307 | contour, the first point is automatically set to (0,0). |
| 308 | |
| 309 | @param p1 The 1st control point on a cubic curve |
| 310 | @param p2 The 2nd control point on a cubic curve |
| 311 | @param p3 The end point on a cubic curve |
| 312 | */ |
| 313 | void cubicTo(const SkPoint& p1, const SkPoint& p2, const SkPoint& p3) { |
| 314 | this->cubicTo(p1.fX, p1.fY, p2.fX, p2.fY, p3.fX, p3.fY); |
| 315 | } |
| 316 | |
| 317 | /** Same as cubicTo, but the coordinates are considered relative to the |
| 318 | current point on this contour. If there is no previous point, then a |
| 319 | moveTo(0,0) is inserted automatically. |
| 320 | |
| 321 | @param dx1 The amount to add to the x-coordinate of the last point on |
| 322 | this contour, to specify the 1st control point of a cubic curve |
| 323 | @param dy1 The amount to add to the y-coordinate of the last point on |
| 324 | this contour, to specify the 1st control point of a cubic curve |
| 325 | @param dx2 The amount to add to the x-coordinate of the last point on |
| 326 | this contour, to specify the 2nd control point of a cubic curve |
| 327 | @param dy2 The amount to add to the y-coordinate of the last point on |
| 328 | this contour, to specify the 2nd control point of a cubic curve |
| 329 | @param dx3 The amount to add to the x-coordinate of the last point on |
| 330 | this contour, to specify the end point of a cubic curve |
| 331 | @param dy3 The amount to add to the y-coordinate of the last point on |
| 332 | this contour, to specify the end point of a cubic curve |
| 333 | */ |
| 334 | void rCubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| 335 | SkScalar x3, SkScalar y3); |
| 336 | |
| 337 | /** Append the specified arc to the path as a new contour. If the start of |
| 338 | the path is different from the path's current last point, then an |
| 339 | automatic lineTo() is added to connect the current contour to the start |
| 340 | of the arc. However, if the path is empty, then we call moveTo() with |
| 341 | the first point of the arc. The sweep angle is treated mod 360. |
| 342 | |
| 343 | @param oval The bounding oval defining the shape and size of the arc |
| 344 | @param startAngle Starting angle (in degrees) where the arc begins |
| 345 | @param sweepAngle Sweep angle (in degrees) measured clockwise. This is |
| 346 | treated mod 360. |
| 347 | @param forceMoveTo If true, always begin a new contour with the arc |
| 348 | */ |
| 349 | void arcTo(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle, |
| 350 | bool forceMoveTo); |
| 351 | |
| 352 | /** Append a line and arc to the current path. This is the same as the |
| 353 | PostScript call "arct". |
| 354 | */ |
| 355 | void arcTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| 356 | SkScalar radius); |
| 357 | |
| 358 | /** Append a line and arc to the current path. This is the same as the |
| 359 | PostScript call "arct". |
| 360 | */ |
| 361 | void arcTo(const SkPoint p1, const SkPoint p2, SkScalar radius) { |
| 362 | this->arcTo(p1.fX, p1.fY, p2.fX, p2.fY, radius); |
| 363 | } |
| 364 | |
| 365 | /** Close the current contour. If the current point is not equal to the |
| 366 | first point of the contour, a line segment is automatically added. |
| 367 | */ |
| 368 | void close(); |
| 369 | |
| 370 | enum Direction { |
| 371 | /** clockwise direction for adding closed contours */ |
| 372 | kCW_Direction, |
| 373 | /** counter-clockwise direction for adding closed contours */ |
| 374 | kCCW_Direction |
| 375 | }; |
| 376 | |
| 377 | /** Add a closed rectangle contour to the path |
| 378 | @param rect The rectangle to add as a closed contour to the path |
| 379 | @param dir The direction to wind the rectangle's contour |
| 380 | */ |
| 381 | void addRect(const SkRect& rect, Direction dir = kCW_Direction); |
| 382 | |
| 383 | /** Add a closed rectangle contour to the path |
| 384 | |
| 385 | @param left The left side of a rectangle to add as a closed contour |
| 386 | to the path |
| 387 | @param top The top of a rectangle to add as a closed contour to the |
| 388 | path |
| 389 | @param right The right side of a rectangle to add as a closed contour |
| 390 | to the path |
| 391 | @param bottom The bottom of a rectangle to add as a closed contour to |
| 392 | the path |
| 393 | @param dir The direction to wind the rectangle's contour |
| 394 | */ |
| 395 | void addRect(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom, |
| 396 | Direction dir = kCW_Direction); |
| 397 | |
| 398 | /** Add a closed oval contour to the path |
| 399 | |
| 400 | @param oval The bounding oval to add as a closed contour to the path |
| 401 | @param dir The direction to wind the oval's contour |
| 402 | */ |
| 403 | void addOval(const SkRect& oval, Direction dir = kCW_Direction); |
| 404 | |
| 405 | /** Add a closed circle contour to the path |
| 406 | |
| 407 | @param x The x-coordinate of the center of a circle to add as a |
| 408 | closed contour to the path |
| 409 | @param y The y-coordinate of the center of a circle to add as a |
| 410 | closed contour to the path |
| 411 | @param radius The radius of a circle to add as a closed contour to the |
| 412 | path |
| 413 | @param dir The direction to wind the circle's contour |
| 414 | */ |
| 415 | void addCircle(SkScalar x, SkScalar y, SkScalar radius, |
| 416 | Direction dir = kCW_Direction); |
| 417 | |
| 418 | /** Add the specified arc to the path as a new contour. |
| 419 | |
| 420 | @param oval The bounds of oval used to define the size of the arc |
| 421 | @param startAngle Starting angle (in degrees) where the arc begins |
| 422 | @param sweepAngle Sweep angle (in degrees) measured clockwise |
| 423 | */ |
| 424 | void addArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle); |
| 425 | |
| 426 | /** Add a closed round-rectangle contour to the path |
| 427 | @param rect The bounds of a round-rectangle to add as a closed contour |
| 428 | @param rx The x-radius of the rounded corners on the round-rectangle |
| 429 | @param ry The y-radius of the rounded corners on the round-rectangle |
| 430 | @param dir The direction to wind the round-rectangle's contour |
| 431 | */ |
| 432 | void addRoundRect(const SkRect& rect, SkScalar rx, SkScalar ry, |
| 433 | Direction dir = kCW_Direction); |
| 434 | |
| 435 | /** Add a closed round-rectangle contour to the path. Each corner receives |
| 436 | two radius values [X, Y]. The corners are ordered top-left, top-right, |
| 437 | bottom-right, bottom-left. |
| 438 | @param rect The bounds of a round-rectangle to add as a closed contour |
| 439 | @param radii Array of 8 scalars, 4 [X,Y] pairs for each corner |
| 440 | @param dir The direction to wind the round-rectangle's contour |
| 441 | */ |
| 442 | void addRoundRect(const SkRect& rect, const SkScalar radii[], |
| 443 | Direction dir = kCW_Direction); |
| 444 | |
| 445 | /** Add a copy of src to the path, offset by (dx,dy) |
| 446 | @param src The path to add as a new contour |
| 447 | @param dx The amount to translate the path in X as it is added |
| 448 | @param dx The amount to translate the path in Y as it is added |
| 449 | */ |
| 450 | void addPath(const SkPath& src, SkScalar dx, SkScalar dy); |
| 451 | |
| 452 | /** Add a copy of src to the path |
| 453 | */ |
| 454 | void addPath(const SkPath& src) { |
| 455 | SkMatrix m; |
| 456 | m.reset(); |
| 457 | this->addPath(src, m); |
| 458 | } |
| 459 | |
| 460 | /** Add a copy of src to the path, transformed by matrix |
| 461 | @param src The path to add as a new contour |
| 462 | */ |
| 463 | void addPath(const SkPath& src, const SkMatrix& matrix); |
| 464 | |
| 465 | /** Offset the path by (dx,dy), returning true on success |
| 466 | |
| 467 | @param dx The amount in the X direction to offset the entire path |
| 468 | @param dy The amount in the Y direction to offset the entire path |
| 469 | @param dst The translated path is written here |
| 470 | */ |
| 471 | void offset(SkScalar dx, SkScalar dy, SkPath* dst) const; |
| 472 | |
| 473 | /** Offset the path by (dx,dy), returning true on success |
| 474 | |
| 475 | @param dx The amount in the X direction to offset the entire path |
| 476 | @param dy The amount in the Y direction to offset the entire path |
| 477 | */ |
| 478 | void offset(SkScalar dx, SkScalar dy) { |
| 479 | this->offset(dx, dy, this); |
| 480 | } |
| 481 | |
| 482 | /** Transform the points in this path by matrix, and write the answer into |
| 483 | dst. |
| 484 | |
| 485 | @param matrix The matrix to apply to the path |
| 486 | @param dst The transformed path is written here |
| 487 | */ |
| 488 | void transform(const SkMatrix& matrix, SkPath* dst) const; |
| 489 | |
| 490 | /** Transform the points in this path by matrix |
| 491 | |
| 492 | @param matrix The matrix to apply to the path |
| 493 | */ |
| 494 | void transform(const SkMatrix& matrix) { |
| 495 | this->transform(matrix, this); |
| 496 | } |
| 497 | |
| 498 | /** Return the last point on the path. If no points have been added, (0,0) |
| 499 | is returned. |
| 500 | |
| 501 | @param lastPt The last point on the path is returned here |
| 502 | */ |
| 503 | void getLastPt(SkPoint* lastPt) const; |
| 504 | |
| 505 | /** Set the last point on the path. If no points have been added, |
| 506 | moveTo(x,y) is automatically called. |
| 507 | |
| 508 | @param x The new x-coordinate for the last point |
| 509 | @param y The new y-coordinate for the last point |
| 510 | */ |
| 511 | void setLastPt(SkScalar x, SkScalar y); |
| 512 | |
| 513 | /** Set the last point on the path. If no points have been added, moveTo(p) |
| 514 | is automatically called. |
| 515 | |
| 516 | @param p The new location for the last point |
| 517 | */ |
| 518 | void setLastPt(const SkPoint& p) { |
| 519 | this->setLastPt(p.fX, p.fY); |
| 520 | } |
| 521 | |
| 522 | enum Verb { |
| 523 | kMove_Verb, //!< iter.next returns 1 point |
| 524 | kLine_Verb, //!< iter.next returns 2 points |
| 525 | kQuad_Verb, //!< iter.next returns 3 points |
| 526 | kCubic_Verb, //!< iter.next returns 4 points |
| 527 | kClose_Verb, //!< iter.next returns 1 point (the last point) |
| 528 | kDone_Verb //!< iter.next returns 0 points |
| 529 | }; |
| 530 | |
| 531 | /** Iterate through all of the segments (lines, quadratics, cubics) of |
| 532 | each contours in a path. |
| 533 | */ |
ctguil@chromium.org | 7ffb1b2 | 2011-03-15 21:27:08 +0000 | [diff] [blame] | 534 | class SK_API Iter { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 535 | public: |
| 536 | Iter(); |
| 537 | Iter(const SkPath&, bool forceClose); |
| 538 | |
| 539 | void setPath(const SkPath&, bool forceClose); |
| 540 | |
| 541 | /** Return the next verb in this iteration of the path. When all |
| 542 | segments have been visited, return kDone_Verb. |
| 543 | |
| 544 | @param pts The points representing the current verb and/or segment |
| 545 | @return The verb for the current segment |
| 546 | */ |
| 547 | Verb next(SkPoint pts[4]); |
| 548 | |
| 549 | /** If next() returns kLine_Verb, then this query returns true if the |
| 550 | line was the result of a close() command (i.e. the end point is the |
| 551 | initial moveto for this contour). If next() returned a different |
| 552 | verb, this returns an undefined value. |
| 553 | |
| 554 | @return If the last call to next() returned kLine_Verb, return true |
| 555 | if it was the result of an explicit close command. |
| 556 | */ |
| 557 | bool isCloseLine() const { return SkToBool(fCloseLine); } |
| 558 | |
| 559 | /** Returns true if the current contour is closed (has a kClose_Verb) |
| 560 | @return true if the current contour is closed (has a kClose_Verb) |
| 561 | */ |
| 562 | bool isClosedContour() const; |
| 563 | |
| 564 | private: |
| 565 | const SkPoint* fPts; |
| 566 | const uint8_t* fVerbs; |
| 567 | const uint8_t* fVerbStop; |
| 568 | SkPoint fMoveTo; |
| 569 | SkPoint fLastPt; |
| 570 | SkBool8 fForceClose; |
| 571 | SkBool8 fNeedClose; |
| 572 | SkBool8 fNeedMoveTo; |
| 573 | SkBool8 fCloseLine; |
| 574 | |
| 575 | bool cons_moveTo(SkPoint pts[1]); |
| 576 | Verb autoClose(SkPoint pts[2]); |
| 577 | }; |
| 578 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 579 | void dump(bool forceClose, const char title[] = NULL) const; |
reed@android.com | e522ca5 | 2009-11-23 20:10:41 +0000 | [diff] [blame] | 580 | void dump() const; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 581 | |
| 582 | void flatten(SkFlattenableWriteBuffer&) const; |
| 583 | void unflatten(SkFlattenableReadBuffer&); |
| 584 | |
| 585 | /** Subdivide the path so that no segment is longer that dist. |
| 586 | If bendLines is true, then turn all line segments into curves. |
| 587 | If dst == null, then the original path itself is modified (not const!) |
| 588 | */ |
| 589 | void subdivide(SkScalar dist, bool bendLines, SkPath* dst = NULL) const; |
| 590 | |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame^] | 591 | #ifdef ANDROID |
| 592 | uint32_t getGenerationID() const; |
| 593 | #endif |
| 594 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 595 | SkDEBUGCODE(void validate() const;) |
| 596 | |
| 597 | private: |
| 598 | SkTDArray<SkPoint> fPts; |
| 599 | SkTDArray<uint8_t> fVerbs; |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 600 | mutable SkRect fBounds; |
| 601 | mutable uint8_t fBoundsIsDirty; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 602 | uint8_t fFillType; |
reed@android.com | 6b82d1a | 2009-06-03 02:35:01 +0000 | [diff] [blame] | 603 | uint8_t fIsConvex; |
djsollen@google.com | f5dbe2f | 2011-04-15 13:41:26 +0000 | [diff] [blame^] | 604 | #ifdef ANDROID |
| 605 | uint32_t fGenerationID; |
| 606 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 607 | |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 608 | // called, if dirty, by getBounds() |
| 609 | void computeBounds() const; |
| 610 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 611 | friend class Iter; |
| 612 | void cons_moveto(); |
| 613 | |
| 614 | friend class SkPathStroker; |
| 615 | /* Append the first contour of path, ignoring path's initial point. If no |
| 616 | moveTo() call has been made for this contour, the first point is |
| 617 | automatically set to (0,0). |
| 618 | */ |
| 619 | void pathTo(const SkPath& path); |
| 620 | |
| 621 | /* Append, in reverse order, the first contour of path, ignoring path's |
| 622 | last point. If no moveTo() call has been made for this contour, the |
| 623 | first point is automatically set to (0,0). |
| 624 | */ |
| 625 | void reversePathTo(const SkPath&); |
| 626 | |
| 627 | friend const SkPoint* sk_get_path_points(const SkPath&, int index); |
| 628 | friend class SkAutoPathBoundsUpdate; |
| 629 | }; |
| 630 | |
| 631 | #endif |
| 632 | |