| |
| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #include "SkBuffer.h" |
| #include "SkErrorInternals.h" |
| #include "SkMath.h" |
| #include "SkPath.h" |
| #include "SkPathRef.h" |
| #include "SkRRect.h" |
| #include "SkThread.h" |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Path.bounds is defined to be the bounds of all the control points. |
| * If we called bounds.join(r) we would skip r if r was empty, which breaks |
| * our promise. Hence we have a custom joiner that doesn't look at emptiness |
| */ |
| static void joinNoEmptyChecks(SkRect* dst, const SkRect& src) { |
| dst->fLeft = SkMinScalar(dst->fLeft, src.fLeft); |
| dst->fTop = SkMinScalar(dst->fTop, src.fTop); |
| dst->fRight = SkMaxScalar(dst->fRight, src.fRight); |
| dst->fBottom = SkMaxScalar(dst->fBottom, src.fBottom); |
| } |
| |
| static bool is_degenerate(const SkPath& path) { |
| SkPath::Iter iter(path, false); |
| SkPoint pts[4]; |
| return SkPath::kDone_Verb == iter.next(pts); |
| } |
| |
| class SkAutoDisableDirectionCheck { |
| public: |
| SkAutoDisableDirectionCheck(SkPath* path) : fPath(path) { |
| fSaved = static_cast<SkPath::Direction>(fPath->fDirection); |
| } |
| |
| ~SkAutoDisableDirectionCheck() { |
| fPath->fDirection = fSaved; |
| } |
| |
| private: |
| SkPath* fPath; |
| SkPath::Direction fSaved; |
| }; |
| #define SkAutoDisableDirectionCheck(...) SK_REQUIRE_LOCAL_VAR(SkAutoDisableDirectionCheck) |
| |
| /* This guy's constructor/destructor bracket a path editing operation. It is |
| used when we know the bounds of the amount we are going to add to the path |
| (usually a new contour, but not required). |
| |
| It captures some state about the path up front (i.e. if it already has a |
| cached bounds), and then if it can, it updates the cache bounds explicitly, |
| avoiding the need to revisit all of the points in getBounds(). |
| |
| It also notes if the path was originally degenerate, and if so, sets |
| isConvex to true. Thus it can only be used if the contour being added is |
| convex. |
| */ |
| class SkAutoPathBoundsUpdate { |
| public: |
| SkAutoPathBoundsUpdate(SkPath* path, const SkRect& r) : fRect(r) { |
| this->init(path); |
| } |
| |
| SkAutoPathBoundsUpdate(SkPath* path, SkScalar left, SkScalar top, |
| SkScalar right, SkScalar bottom) { |
| fRect.set(left, top, right, bottom); |
| this->init(path); |
| } |
| |
| ~SkAutoPathBoundsUpdate() { |
| fPath->setConvexity(fDegenerate ? SkPath::kConvex_Convexity |
| : SkPath::kUnknown_Convexity); |
| if (fEmpty || fHasValidBounds) { |
| fPath->setBounds(fRect); |
| } |
| } |
| |
| private: |
| SkPath* fPath; |
| SkRect fRect; |
| bool fHasValidBounds; |
| bool fDegenerate; |
| bool fEmpty; |
| |
| void init(SkPath* path) { |
| // Cannot use fRect for our bounds unless we know it is sorted |
| fRect.sort(); |
| fPath = path; |
| // Mark the path's bounds as dirty if (1) they are, or (2) the path |
| // is non-finite, and therefore its bounds are not meaningful |
| fHasValidBounds = path->hasComputedBounds() && path->isFinite(); |
| fEmpty = path->isEmpty(); |
| if (fHasValidBounds && !fEmpty) { |
| joinNoEmptyChecks(&fRect, fPath->getBounds()); |
| } |
| fDegenerate = is_degenerate(*path); |
| } |
| }; |
| #define SkAutoPathBoundsUpdate(...) SK_REQUIRE_LOCAL_VAR(SkAutoPathBoundsUpdate) |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| /* |
| Stores the verbs and points as they are given to us, with exceptions: |
| - we only record "Close" if it was immediately preceeded by Move | Line | Quad | Cubic |
| - we insert a Move(0,0) if Line | Quad | Cubic is our first command |
| |
| The iterator does more cleanup, especially if forceClose == true |
| 1. If we encounter degenerate segments, remove them |
| 2. if we encounter Close, return a cons'd up Line() first (if the curr-pt != start-pt) |
| 3. if we encounter Move without a preceeding Close, and forceClose is true, goto #2 |
| 4. if we encounter Line | Quad | Cubic after Close, cons up a Move |
| */ |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| // flag to require a moveTo if we begin with something else, like lineTo etc. |
| #define INITIAL_LASTMOVETOINDEX_VALUE ~0 |
| |
| SkPath::SkPath() |
| : fPathRef(SkPathRef::CreateEmpty()) |
| #ifdef SK_BUILD_FOR_ANDROID |
| , fSourcePath(NULL) |
| #endif |
| { |
| this->resetFields(); |
| } |
| |
| void SkPath::resetFields() { |
| //fPathRef is assumed to have been emptied by the caller. |
| fLastMoveToIndex = INITIAL_LASTMOVETOINDEX_VALUE; |
| fFillType = kWinding_FillType; |
| fConvexity = kUnknown_Convexity; |
| fDirection = kUnknown_Direction; |
| |
| // We don't touch Android's fSourcePath. It's used to track texture garbage collection, so we |
| // don't want to muck with it if it's been set to something non-NULL. |
| } |
| |
| SkPath::SkPath(const SkPath& that) |
| : fPathRef(SkRef(that.fPathRef.get())) { |
| this->copyFields(that); |
| #ifdef SK_BUILD_FOR_ANDROID |
| fSourcePath = that.fSourcePath; |
| #endif |
| SkDEBUGCODE(that.validate();) |
| } |
| |
| SkPath::~SkPath() { |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| SkPath& SkPath::operator=(const SkPath& that) { |
| SkDEBUGCODE(that.validate();) |
| |
| if (this != &that) { |
| fPathRef.reset(SkRef(that.fPathRef.get())); |
| this->copyFields(that); |
| #ifdef SK_BUILD_FOR_ANDROID |
| fSourcePath = that.fSourcePath; |
| #endif |
| } |
| SkDEBUGCODE(this->validate();) |
| return *this; |
| } |
| |
| void SkPath::copyFields(const SkPath& that) { |
| //fPathRef is assumed to have been set by the caller. |
| fLastMoveToIndex = that.fLastMoveToIndex; |
| fFillType = that.fFillType; |
| fConvexity = that.fConvexity; |
| fDirection = that.fDirection; |
| } |
| |
| bool operator==(const SkPath& a, const SkPath& b) { |
| // note: don't need to look at isConvex or bounds, since just comparing the |
| // raw data is sufficient. |
| return &a == &b || |
| (a.fFillType == b.fFillType && *a.fPathRef.get() == *b.fPathRef.get()); |
| } |
| |
| void SkPath::swap(SkPath& that) { |
| SkASSERT(&that != NULL); |
| |
| if (this != &that) { |
| fPathRef.swap(&that.fPathRef); |
| SkTSwap<int>(fLastMoveToIndex, that.fLastMoveToIndex); |
| SkTSwap<uint8_t>(fFillType, that.fFillType); |
| SkTSwap<uint8_t>(fConvexity, that.fConvexity); |
| SkTSwap<uint8_t>(fDirection, that.fDirection); |
| #ifdef SK_BUILD_FOR_ANDROID |
| SkTSwap<const SkPath*>(fSourcePath, that.fSourcePath); |
| #endif |
| } |
| } |
| |
| static inline bool check_edge_against_rect(const SkPoint& p0, |
| const SkPoint& p1, |
| const SkRect& rect, |
| SkPath::Direction dir) { |
| const SkPoint* edgeBegin; |
| SkVector v; |
| if (SkPath::kCW_Direction == dir) { |
| v = p1 - p0; |
| edgeBegin = &p0; |
| } else { |
| v = p0 - p1; |
| edgeBegin = &p1; |
| } |
| if (v.fX || v.fY) { |
| // check the cross product of v with the vec from edgeBegin to each rect corner |
| SkScalar yL = SkScalarMul(v.fY, rect.fLeft - edgeBegin->fX); |
| SkScalar xT = SkScalarMul(v.fX, rect.fTop - edgeBegin->fY); |
| SkScalar yR = SkScalarMul(v.fY, rect.fRight - edgeBegin->fX); |
| SkScalar xB = SkScalarMul(v.fX, rect.fBottom - edgeBegin->fY); |
| if ((xT < yL) || (xT < yR) || (xB < yL) || (xB < yR)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool SkPath::conservativelyContainsRect(const SkRect& rect) const { |
| // This only handles non-degenerate convex paths currently. |
| if (kConvex_Convexity != this->getConvexity()) { |
| return false; |
| } |
| |
| Direction direction; |
| if (!this->cheapComputeDirection(&direction)) { |
| return false; |
| } |
| |
| SkPoint firstPt; |
| SkPoint prevPt; |
| RawIter iter(*this); |
| SkPath::Verb verb; |
| SkPoint pts[4]; |
| SkDEBUGCODE(int moveCnt = 0;) |
| SkDEBUGCODE(int segmentCount = 0;) |
| SkDEBUGCODE(int closeCount = 0;) |
| |
| while ((verb = iter.next(pts)) != kDone_Verb) { |
| int nextPt = -1; |
| switch (verb) { |
| case kMove_Verb: |
| SkASSERT(!segmentCount && !closeCount); |
| SkDEBUGCODE(++moveCnt); |
| firstPt = prevPt = pts[0]; |
| break; |
| case kLine_Verb: |
| nextPt = 1; |
| SkASSERT(moveCnt && !closeCount); |
| SkDEBUGCODE(++segmentCount); |
| break; |
| case kQuad_Verb: |
| case kConic_Verb: |
| SkASSERT(moveCnt && !closeCount); |
| SkDEBUGCODE(++segmentCount); |
| nextPt = 2; |
| break; |
| case kCubic_Verb: |
| SkASSERT(moveCnt && !closeCount); |
| SkDEBUGCODE(++segmentCount); |
| nextPt = 3; |
| break; |
| case kClose_Verb: |
| SkDEBUGCODE(++closeCount;) |
| break; |
| default: |
| SkDEBUGFAIL("unknown verb"); |
| } |
| if (-1 != nextPt) { |
| if (!check_edge_against_rect(prevPt, pts[nextPt], rect, direction)) { |
| return false; |
| } |
| prevPt = pts[nextPt]; |
| } |
| } |
| |
| return check_edge_against_rect(prevPt, firstPt, rect, direction); |
| } |
| |
| uint32_t SkPath::getGenerationID() const { |
| uint32_t genID = fPathRef->genID(); |
| #ifdef SK_BUILD_FOR_ANDROID |
| SkASSERT((unsigned)fFillType < (1 << (32 - kPathRefGenIDBitCnt))); |
| genID |= static_cast<uint32_t>(fFillType) << kPathRefGenIDBitCnt; |
| #endif |
| return genID; |
| } |
| |
| #ifdef SK_BUILD_FOR_ANDROID |
| const SkPath* SkPath::getSourcePath() const { |
| return fSourcePath; |
| } |
| |
| void SkPath::setSourcePath(const SkPath* path) { |
| fSourcePath = path; |
| } |
| #endif |
| |
| void SkPath::reset() { |
| SkDEBUGCODE(this->validate();) |
| |
| fPathRef.reset(SkPathRef::CreateEmpty()); |
| this->resetFields(); |
| } |
| |
| void SkPath::rewind() { |
| SkDEBUGCODE(this->validate();) |
| |
| SkPathRef::Rewind(&fPathRef); |
| this->resetFields(); |
| } |
| |
| bool SkPath::isLine(SkPoint line[2]) const { |
| int verbCount = fPathRef->countVerbs(); |
| |
| if (2 == verbCount) { |
| SkASSERT(kMove_Verb == fPathRef->atVerb(0)); |
| if (kLine_Verb == fPathRef->atVerb(1)) { |
| SkASSERT(2 == fPathRef->countPoints()); |
| if (line) { |
| const SkPoint* pts = fPathRef->points(); |
| line[0] = pts[0]; |
| line[1] = pts[1]; |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /* |
| Determines if path is a rect by keeping track of changes in direction |
| and looking for a loop either clockwise or counterclockwise. |
| |
| The direction is computed such that: |
| 0: vertical up |
| 1: horizontal left |
| 2: vertical down |
| 3: horizontal right |
| |
| A rectangle cycles up/right/down/left or up/left/down/right. |
| |
| The test fails if: |
| The path is closed, and followed by a line. |
| A second move creates a new endpoint. |
| A diagonal line is parsed. |
| There's more than four changes of direction. |
| There's a discontinuity on the line (e.g., a move in the middle) |
| The line reverses direction. |
| The path contains a quadratic or cubic. |
| The path contains fewer than four points. |
| *The rectangle doesn't complete a cycle. |
| *The final point isn't equal to the first point. |
| |
| *These last two conditions we relax if we have a 3-edge path that would |
| form a rectangle if it were closed (as we do when we fill a path) |
| |
| It's OK if the path has: |
| Several colinear line segments composing a rectangle side. |
| Single points on the rectangle side. |
| |
| The direction takes advantage of the corners found since opposite sides |
| must travel in opposite directions. |
| |
| FIXME: Allow colinear quads and cubics to be treated like lines. |
| FIXME: If the API passes fill-only, return true if the filled stroke |
| is a rectangle, though the caller failed to close the path. |
| |
| first,last,next direction state-machine: |
| 0x1 is set if the segment is horizontal |
| 0x2 is set if the segment is moving to the right or down |
| thus: |
| two directions are opposites iff (dirA ^ dirB) == 0x2 |
| two directions are perpendicular iff (dirA ^ dirB) == 0x1 |
| |
| */ |
| static int rect_make_dir(SkScalar dx, SkScalar dy) { |
| return ((0 != dx) << 0) | ((dx > 0 || dy > 0) << 1); |
| } |
| bool SkPath::isRectContour(bool allowPartial, int* currVerb, const SkPoint** ptsPtr, |
| bool* isClosed, Direction* direction) const { |
| int corners = 0; |
| SkPoint first, last; |
| const SkPoint* pts = *ptsPtr; |
| const SkPoint* savePts = NULL; |
| first.set(0, 0); |
| last.set(0, 0); |
| int firstDirection = 0; |
| int lastDirection = 0; |
| int nextDirection = 0; |
| bool closedOrMoved = false; |
| bool autoClose = false; |
| int verbCnt = fPathRef->countVerbs(); |
| while (*currVerb < verbCnt && (!allowPartial || !autoClose)) { |
| switch (fPathRef->atVerb(*currVerb)) { |
| case kClose_Verb: |
| savePts = pts; |
| pts = *ptsPtr; |
| autoClose = true; |
| case kLine_Verb: { |
| SkScalar left = last.fX; |
| SkScalar top = last.fY; |
| SkScalar right = pts->fX; |
| SkScalar bottom = pts->fY; |
| ++pts; |
| if (left != right && top != bottom) { |
| return false; // diagonal |
| } |
| if (left == right && top == bottom) { |
| break; // single point on side OK |
| } |
| nextDirection = rect_make_dir(right - left, bottom - top); |
| if (0 == corners) { |
| firstDirection = nextDirection; |
| first = last; |
| last = pts[-1]; |
| corners = 1; |
| closedOrMoved = false; |
| break; |
| } |
| if (closedOrMoved) { |
| return false; // closed followed by a line |
| } |
| if (autoClose && nextDirection == firstDirection) { |
| break; // colinear with first |
| } |
| closedOrMoved = autoClose; |
| if (lastDirection != nextDirection) { |
| if (++corners > 4) { |
| return false; // too many direction changes |
| } |
| } |
| last = pts[-1]; |
| if (lastDirection == nextDirection) { |
| break; // colinear segment |
| } |
| // Possible values for corners are 2, 3, and 4. |
| // When corners == 3, nextDirection opposes firstDirection. |
| // Otherwise, nextDirection at corner 2 opposes corner 4. |
| int turn = firstDirection ^ (corners - 1); |
| int directionCycle = 3 == corners ? 0 : nextDirection ^ turn; |
| if ((directionCycle ^ turn) != nextDirection) { |
| return false; // direction didn't follow cycle |
| } |
| break; |
| } |
| case kQuad_Verb: |
| case kConic_Verb: |
| case kCubic_Verb: |
| return false; // quadratic, cubic not allowed |
| case kMove_Verb: |
| last = *pts++; |
| closedOrMoved = true; |
| break; |
| default: |
| SkDEBUGFAIL("unexpected verb"); |
| break; |
| } |
| *currVerb += 1; |
| lastDirection = nextDirection; |
| } |
| // Success if 4 corners and first point equals last |
| bool result = 4 == corners && (first == last || autoClose); |
| if (!result) { |
| // check if we are just an incomplete rectangle, in which case we can |
| // return true, but not claim to be closed. |
| // e.g. |
| // 3 sided rectangle |
| // 4 sided but the last edge is not long enough to reach the start |
| // |
| SkScalar closeX = first.x() - last.x(); |
| SkScalar closeY = first.y() - last.y(); |
| if (closeX && closeY) { |
| return false; // we're diagonal, abort (can we ever reach this?) |
| } |
| int closeDirection = rect_make_dir(closeX, closeY); |
| // make sure the close-segment doesn't double-back on itself |
| if (3 == corners || (4 == corners && closeDirection == lastDirection)) { |
| result = true; |
| autoClose = false; // we are not closed |
| } |
| } |
| if (savePts) { |
| *ptsPtr = savePts; |
| } |
| if (result && isClosed) { |
| *isClosed = autoClose; |
| } |
| if (result && direction) { |
| *direction = firstDirection == ((lastDirection + 1) & 3) ? kCCW_Direction : kCW_Direction; |
| } |
| return result; |
| } |
| |
| SkPath::PathAsRect SkPath::asRect(Direction* direction) const { |
| SK_COMPILE_ASSERT(0 == kNone_PathAsRect, path_as_rect_mismatch); |
| SK_COMPILE_ASSERT(1 == kFill_PathAsRect, path_as_rect_mismatch); |
| SK_COMPILE_ASSERT(2 == kStroke_PathAsRect, path_as_rect_mismatch); |
| bool isClosed = false; |
| return (PathAsRect) (isRect(&isClosed, direction) + isClosed); |
| } |
| |
| bool SkPath::isRect(SkRect* rect) const { |
| SkDEBUGCODE(this->validate();) |
| int currVerb = 0; |
| const SkPoint* pts = fPathRef->points(); |
| bool result = isRectContour(false, &currVerb, &pts, NULL, NULL); |
| if (result && rect) { |
| *rect = getBounds(); |
| } |
| return result; |
| } |
| |
| bool SkPath::isRect(bool* isClosed, Direction* direction) const { |
| SkDEBUGCODE(this->validate();) |
| int currVerb = 0; |
| const SkPoint* pts = fPathRef->points(); |
| return isRectContour(false, &currVerb, &pts, isClosed, direction); |
| } |
| |
| bool SkPath::isNestedRects(SkRect rects[2], Direction dirs[2]) const { |
| SkDEBUGCODE(this->validate();) |
| int currVerb = 0; |
| const SkPoint* pts = fPathRef->points(); |
| const SkPoint* first = pts; |
| Direction testDirs[2]; |
| if (!isRectContour(true, &currVerb, &pts, NULL, &testDirs[0])) { |
| return false; |
| } |
| const SkPoint* last = pts; |
| SkRect testRects[2]; |
| if (isRectContour(false, &currVerb, &pts, NULL, &testDirs[1])) { |
| testRects[0].set(first, SkToS32(last - first)); |
| testRects[1].set(last, SkToS32(pts - last)); |
| if (testRects[0].contains(testRects[1])) { |
| if (rects) { |
| rects[0] = testRects[0]; |
| rects[1] = testRects[1]; |
| } |
| if (dirs) { |
| dirs[0] = testDirs[0]; |
| dirs[1] = testDirs[1]; |
| } |
| return true; |
| } |
| if (testRects[1].contains(testRects[0])) { |
| if (rects) { |
| rects[0] = testRects[1]; |
| rects[1] = testRects[0]; |
| } |
| if (dirs) { |
| dirs[0] = testDirs[1]; |
| dirs[1] = testDirs[0]; |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| int SkPath::countPoints() const { |
| return fPathRef->countPoints(); |
| } |
| |
| int SkPath::getPoints(SkPoint dst[], int max) const { |
| SkDEBUGCODE(this->validate();) |
| |
| SkASSERT(max >= 0); |
| SkASSERT(!max || dst); |
| int count = SkMin32(max, fPathRef->countPoints()); |
| memcpy(dst, fPathRef->points(), count * sizeof(SkPoint)); |
| return fPathRef->countPoints(); |
| } |
| |
| SkPoint SkPath::getPoint(int index) const { |
| if ((unsigned)index < (unsigned)fPathRef->countPoints()) { |
| return fPathRef->atPoint(index); |
| } |
| return SkPoint::Make(0, 0); |
| } |
| |
| int SkPath::countVerbs() const { |
| return fPathRef->countVerbs(); |
| } |
| |
| static inline void copy_verbs_reverse(uint8_t* inorderDst, |
| const uint8_t* reversedSrc, |
| int count) { |
| for (int i = 0; i < count; ++i) { |
| inorderDst[i] = reversedSrc[~i]; |
| } |
| } |
| |
| int SkPath::getVerbs(uint8_t dst[], int max) const { |
| SkDEBUGCODE(this->validate();) |
| |
| SkASSERT(max >= 0); |
| SkASSERT(!max || dst); |
| int count = SkMin32(max, fPathRef->countVerbs()); |
| copy_verbs_reverse(dst, fPathRef->verbs(), count); |
| return fPathRef->countVerbs(); |
| } |
| |
| bool SkPath::getLastPt(SkPoint* lastPt) const { |
| SkDEBUGCODE(this->validate();) |
| |
| int count = fPathRef->countPoints(); |
| if (count > 0) { |
| if (lastPt) { |
| *lastPt = fPathRef->atPoint(count - 1); |
| } |
| return true; |
| } |
| if (lastPt) { |
| lastPt->set(0, 0); |
| } |
| return false; |
| } |
| |
| void SkPath::setLastPt(SkScalar x, SkScalar y) { |
| SkDEBUGCODE(this->validate();) |
| |
| int count = fPathRef->countPoints(); |
| if (count == 0) { |
| this->moveTo(x, y); |
| } else { |
| SkPathRef::Editor ed(&fPathRef); |
| ed.atPoint(count-1)->set(x, y); |
| } |
| } |
| |
| void SkPath::setConvexity(Convexity c) { |
| if (fConvexity != c) { |
| fConvexity = c; |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // Construction methods |
| |
| #define DIRTY_AFTER_EDIT \ |
| do { \ |
| fConvexity = kUnknown_Convexity; \ |
| fDirection = kUnknown_Direction; \ |
| } while (0) |
| |
| void SkPath::incReserve(U16CPU inc) { |
| SkDEBUGCODE(this->validate();) |
| SkPathRef::Editor(&fPathRef, inc, inc); |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| void SkPath::moveTo(SkScalar x, SkScalar y) { |
| SkDEBUGCODE(this->validate();) |
| |
| SkPathRef::Editor ed(&fPathRef); |
| |
| // remember our index |
| fLastMoveToIndex = fPathRef->countPoints(); |
| |
| ed.growForVerb(kMove_Verb)->set(x, y); |
| |
| DIRTY_AFTER_EDIT; |
| } |
| |
| void SkPath::rMoveTo(SkScalar x, SkScalar y) { |
| SkPoint pt; |
| this->getLastPt(&pt); |
| this->moveTo(pt.fX + x, pt.fY + y); |
| } |
| |
| void SkPath::injectMoveToIfNeeded() { |
| if (fLastMoveToIndex < 0) { |
| SkScalar x, y; |
| if (fPathRef->countVerbs() == 0) { |
| x = y = 0; |
| } else { |
| const SkPoint& pt = fPathRef->atPoint(~fLastMoveToIndex); |
| x = pt.fX; |
| y = pt.fY; |
| } |
| this->moveTo(x, y); |
| } |
| } |
| |
| void SkPath::lineTo(SkScalar x, SkScalar y) { |
| SkDEBUGCODE(this->validate();) |
| |
| this->injectMoveToIfNeeded(); |
| |
| SkPathRef::Editor ed(&fPathRef); |
| ed.growForVerb(kLine_Verb)->set(x, y); |
| |
| DIRTY_AFTER_EDIT; |
| } |
| |
| void SkPath::rLineTo(SkScalar x, SkScalar y) { |
| this->injectMoveToIfNeeded(); // This can change the result of this->getLastPt(). |
| SkPoint pt; |
| this->getLastPt(&pt); |
| this->lineTo(pt.fX + x, pt.fY + y); |
| } |
| |
| void SkPath::quadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2) { |
| SkDEBUGCODE(this->validate();) |
| |
| this->injectMoveToIfNeeded(); |
| |
| SkPathRef::Editor ed(&fPathRef); |
| SkPoint* pts = ed.growForVerb(kQuad_Verb); |
| pts[0].set(x1, y1); |
| pts[1].set(x2, y2); |
| |
| DIRTY_AFTER_EDIT; |
| } |
| |
| void SkPath::rQuadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2) { |
| this->injectMoveToIfNeeded(); // This can change the result of this->getLastPt(). |
| SkPoint pt; |
| this->getLastPt(&pt); |
| this->quadTo(pt.fX + x1, pt.fY + y1, pt.fX + x2, pt.fY + y2); |
| } |
| |
| void SkPath::conicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar w) { |
| // check for <= 0 or NaN with this test |
| if (!(w > 0)) { |
| this->lineTo(x2, y2); |
| } else if (!SkScalarIsFinite(w)) { |
| this->lineTo(x1, y1); |
| this->lineTo(x2, y2); |
| } else if (SK_Scalar1 == w) { |
| this->quadTo(x1, y1, x2, y2); |
| } else { |
| SkDEBUGCODE(this->validate();) |
| |
| this->injectMoveToIfNeeded(); |
| |
| SkPathRef::Editor ed(&fPathRef); |
| SkPoint* pts = ed.growForVerb(kConic_Verb, w); |
| pts[0].set(x1, y1); |
| pts[1].set(x2, y2); |
| |
| DIRTY_AFTER_EDIT; |
| } |
| } |
| |
| void SkPath::rConicTo(SkScalar dx1, SkScalar dy1, SkScalar dx2, SkScalar dy2, |
| SkScalar w) { |
| this->injectMoveToIfNeeded(); // This can change the result of this->getLastPt(). |
| SkPoint pt; |
| this->getLastPt(&pt); |
| this->conicTo(pt.fX + dx1, pt.fY + dy1, pt.fX + dx2, pt.fY + dy2, w); |
| } |
| |
| void SkPath::cubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar x3, SkScalar y3) { |
| SkDEBUGCODE(this->validate();) |
| |
| this->injectMoveToIfNeeded(); |
| |
| SkPathRef::Editor ed(&fPathRef); |
| SkPoint* pts = ed.growForVerb(kCubic_Verb); |
| pts[0].set(x1, y1); |
| pts[1].set(x2, y2); |
| pts[2].set(x3, y3); |
| |
| DIRTY_AFTER_EDIT; |
| } |
| |
| void SkPath::rCubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar x3, SkScalar y3) { |
| this->injectMoveToIfNeeded(); // This can change the result of this->getLastPt(). |
| SkPoint pt; |
| this->getLastPt(&pt); |
| this->cubicTo(pt.fX + x1, pt.fY + y1, pt.fX + x2, pt.fY + y2, |
| pt.fX + x3, pt.fY + y3); |
| } |
| |
| void SkPath::close() { |
| SkDEBUGCODE(this->validate();) |
| |
| int count = fPathRef->countVerbs(); |
| if (count > 0) { |
| switch (fPathRef->atVerb(count - 1)) { |
| case kLine_Verb: |
| case kQuad_Verb: |
| case kConic_Verb: |
| case kCubic_Verb: |
| case kMove_Verb: { |
| SkPathRef::Editor ed(&fPathRef); |
| ed.growForVerb(kClose_Verb); |
| break; |
| } |
| case kClose_Verb: |
| // don't add a close if it's the first verb or a repeat |
| break; |
| default: |
| SkDEBUGFAIL("unexpected verb"); |
| break; |
| } |
| } |
| |
| // signal that we need a moveTo to follow us (unless we're done) |
| #if 0 |
| if (fLastMoveToIndex >= 0) { |
| fLastMoveToIndex = ~fLastMoveToIndex; |
| } |
| #else |
| fLastMoveToIndex ^= ~fLastMoveToIndex >> (8 * sizeof(fLastMoveToIndex) - 1); |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static void assert_known_direction(int dir) { |
| SkASSERT(SkPath::kCW_Direction == dir || SkPath::kCCW_Direction == dir); |
| } |
| |
| void SkPath::addRect(const SkRect& rect, Direction dir) { |
| this->addRect(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, dir); |
| } |
| |
| void SkPath::addRect(SkScalar left, SkScalar top, SkScalar right, |
| SkScalar bottom, Direction dir) { |
| assert_known_direction(dir); |
| fDirection = this->hasOnlyMoveTos() ? dir : kUnknown_Direction; |
| SkAutoDisableDirectionCheck addc(this); |
| |
| SkAutoPathBoundsUpdate apbu(this, left, top, right, bottom); |
| |
| this->incReserve(5); |
| |
| this->moveTo(left, top); |
| if (dir == kCCW_Direction) { |
| this->lineTo(left, bottom); |
| this->lineTo(right, bottom); |
| this->lineTo(right, top); |
| } else { |
| this->lineTo(right, top); |
| this->lineTo(right, bottom); |
| this->lineTo(left, bottom); |
| } |
| this->close(); |
| } |
| |
| void SkPath::addPoly(const SkPoint pts[], int count, bool close) { |
| SkDEBUGCODE(this->validate();) |
| if (count <= 0) { |
| return; |
| } |
| |
| fLastMoveToIndex = fPathRef->countPoints(); |
| |
| // +close makes room for the extra kClose_Verb |
| SkPathRef::Editor ed(&fPathRef, count+close, count); |
| |
| ed.growForVerb(kMove_Verb)->set(pts[0].fX, pts[0].fY); |
| if (count > 1) { |
| SkPoint* p = ed.growForRepeatedVerb(kLine_Verb, count - 1); |
| memcpy(p, &pts[1], (count-1) * sizeof(SkPoint)); |
| } |
| |
| if (close) { |
| ed.growForVerb(kClose_Verb); |
| } |
| |
| DIRTY_AFTER_EDIT; |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| #include "SkGeometry.h" |
| |
| static int build_arc_points(const SkRect& oval, SkScalar startAngle, |
| SkScalar sweepAngle, |
| SkPoint pts[kSkBuildQuadArcStorage]) { |
| |
| if (0 == sweepAngle && |
| (0 == startAngle || SkIntToScalar(360) == startAngle)) { |
| // Chrome uses this path to move into and out of ovals. If not |
| // treated as a special case the moves can distort the oval's |
| // bounding box (and break the circle special case). |
| pts[0].set(oval.fRight, oval.centerY()); |
| return 1; |
| } else if (0 == oval.width() && 0 == oval.height()) { |
| // Chrome will sometimes create 0 radius round rects. Having degenerate |
| // quad segments in the path prevents the path from being recognized as |
| // a rect. |
| // TODO: optimizing the case where only one of width or height is zero |
| // should also be considered. This case, however, doesn't seem to be |
| // as common as the single point case. |
| pts[0].set(oval.fRight, oval.fTop); |
| return 1; |
| } |
| |
| SkVector start, stop; |
| |
| start.fY = SkScalarSinCos(SkDegreesToRadians(startAngle), &start.fX); |
| stop.fY = SkScalarSinCos(SkDegreesToRadians(startAngle + sweepAngle), |
| &stop.fX); |
| |
| /* If the sweep angle is nearly (but less than) 360, then due to precision |
| loss in radians-conversion and/or sin/cos, we may end up with coincident |
| vectors, which will fool SkBuildQuadArc into doing nothing (bad) instead |
| of drawing a nearly complete circle (good). |
| e.g. canvas.drawArc(0, 359.99, ...) |
| -vs- canvas.drawArc(0, 359.9, ...) |
| We try to detect this edge case, and tweak the stop vector |
| */ |
| if (start == stop) { |
| SkScalar sw = SkScalarAbs(sweepAngle); |
| if (sw < SkIntToScalar(360) && sw > SkIntToScalar(359)) { |
| SkScalar stopRad = SkDegreesToRadians(startAngle + sweepAngle); |
| // make a guess at a tiny angle (in radians) to tweak by |
| SkScalar deltaRad = SkScalarCopySign(SK_Scalar1/512, sweepAngle); |
| // not sure how much will be enough, so we use a loop |
| do { |
| stopRad -= deltaRad; |
| stop.fY = SkScalarSinCos(stopRad, &stop.fX); |
| } while (start == stop); |
| } |
| } |
| |
| SkMatrix matrix; |
| |
| matrix.setScale(SkScalarHalf(oval.width()), SkScalarHalf(oval.height())); |
| matrix.postTranslate(oval.centerX(), oval.centerY()); |
| |
| return SkBuildQuadArc(start, stop, |
| sweepAngle > 0 ? kCW_SkRotationDirection : |
| kCCW_SkRotationDirection, |
| &matrix, pts); |
| } |
| |
| void SkPath::addRoundRect(const SkRect& rect, const SkScalar radii[], |
| Direction dir) { |
| SkRRect rrect; |
| rrect.setRectRadii(rect, (const SkVector*) radii); |
| this->addRRect(rrect, dir); |
| } |
| |
| /* The inline clockwise and counterclockwise round rect quad approximations |
| make it easier to see the symmetry patterns used by add corner quads. |
| Clockwise corner value |
| path->lineTo(rect.fLeft, rect.fTop + ry); 0 upper left |
| path->quadTo(rect.fLeft, rect.fTop + offPtY, |
| rect.fLeft + midPtX, rect.fTop + midPtY); |
| path->quadTo(rect.fLeft + offPtX, rect.fTop, |
| rect.fLeft + rx, rect.fTop); |
| |
| path->lineTo(rect.fRight - rx, rect.fTop); 1 upper right |
| path->quadTo(rect.fRight - offPtX, rect.fTop, |
| rect.fRight - midPtX, rect.fTop + midPtY); |
| path->quadTo(rect.fRight, rect.fTop + offPtY, |
| rect.fRight, rect.fTop + ry); |
| |
| path->lineTo(rect.fRight, rect.fBottom - ry); 2 lower right |
| path->quadTo(rect.fRight, rect.fBottom - offPtY, |
| rect.fRight - midPtX, rect.fBottom - midPtY); |
| path->quadTo(rect.fRight - offPtX, rect.fBottom, |
| rect.fRight - rx, rect.fBottom); |
| |
| path->lineTo(rect.fLeft + rx, rect.fBottom); 3 lower left |
| path->quadTo(rect.fLeft + offPtX, rect.fBottom, |
| rect.fLeft + midPtX, rect.fBottom - midPtY); |
| path->quadTo(rect.fLeft, rect.fBottom - offPtY, |
| rect.fLeft, rect.fBottom - ry); |
| |
| Counterclockwise |
| path->lineTo(rect.fLeft, rect.fBottom - ry); 3 lower left |
| path->quadTo(rect.fLeft, rect.fBottom - offPtY, |
| rect.fLeft + midPtX, rect.fBottom - midPtY); |
| path->quadTo(rect.fLeft + offPtX, rect.fBottom, |
| rect.fLeft + rx, rect.fBottom); |
| |
| path->lineTo(rect.fRight - rx, rect.fBottom); 2 lower right |
| path->quadTo(rect.fRight - offPtX, rect.fBottom, |
| rect.fRight - midPtX, rect.fBottom - midPtY); |
| path->quadTo(rect.fRight, rect.fBottom - offPtY, |
| rect.fRight, rect.fBottom - ry); |
| |
| path->lineTo(rect.fRight, rect.fTop + ry); 1 upper right |
| path->quadTo(rect.fRight, rect.fTop + offPtY, |
| rect.fRight - midPtX, rect.fTop + midPtY); |
| path->quadTo(rect.fRight - offPtX, rect.fTop, |
| rect.fRight - rx, rect.fTop); |
| |
| path->lineTo(rect.fLeft + rx, rect.fTop); 0 upper left |
| path->quadTo(rect.fLeft + offPtX, rect.fTop, |
| rect.fLeft + midPtX, rect.fTop + midPtY); |
| path->quadTo(rect.fLeft, rect.fTop + offPtY, |
| rect.fLeft, rect.fTop + ry); |
| */ |
| static void add_corner_quads(SkPath* path, const SkRRect& rrect, |
| SkRRect::Corner corner, SkPath::Direction dir) { |
| const SkRect& rect = rrect.rect(); |
| const SkVector& radii = rrect.radii(corner); |
| SkScalar rx = radii.fX; |
| SkScalar ry = radii.fY; |
| // The mid point of the quadratic arc approximation is half way between the two |
| // control points. |
| const SkScalar mid = 1 - (SK_Scalar1 + SK_ScalarTanPIOver8) / 2; |
| SkScalar midPtX = rx * mid; |
| SkScalar midPtY = ry * mid; |
| const SkScalar control = 1 - SK_ScalarTanPIOver8; |
| SkScalar offPtX = rx * control; |
| SkScalar offPtY = ry * control; |
| static const int kCornerPts = 5; |
| SkScalar xOff[kCornerPts]; |
| SkScalar yOff[kCornerPts]; |
| |
| if ((corner & 1) == (dir == SkPath::kCCW_Direction)) { // corners always alternate direction |
| SkASSERT(dir == SkPath::kCCW_Direction |
| ? corner == SkRRect::kLowerLeft_Corner || corner == SkRRect::kUpperRight_Corner |
| : corner == SkRRect::kUpperLeft_Corner || corner == SkRRect::kLowerRight_Corner); |
| xOff[0] = xOff[1] = 0; |
| xOff[2] = midPtX; |
| xOff[3] = offPtX; |
| xOff[4] = rx; |
| yOff[0] = ry; |
| yOff[1] = offPtY; |
| yOff[2] = midPtY; |
| yOff[3] = yOff[4] = 0; |
| } else { |
| xOff[0] = rx; |
| xOff[1] = offPtX; |
| xOff[2] = midPtX; |
| xOff[3] = xOff[4] = 0; |
| yOff[0] = yOff[1] = 0; |
| yOff[2] = midPtY; |
| yOff[3] = offPtY; |
| yOff[4] = ry; |
| } |
| if ((corner - 1) & 2) { |
| SkASSERT(corner == SkRRect::kLowerLeft_Corner || corner == SkRRect::kUpperLeft_Corner); |
| for (int i = 0; i < kCornerPts; ++i) { |
| xOff[i] = rect.fLeft + xOff[i]; |
| } |
| } else { |
| SkASSERT(corner == SkRRect::kLowerRight_Corner || corner == SkRRect::kUpperRight_Corner); |
| for (int i = 0; i < kCornerPts; ++i) { |
| xOff[i] = rect.fRight - xOff[i]; |
| } |
| } |
| if (corner < SkRRect::kLowerRight_Corner) { |
| for (int i = 0; i < kCornerPts; ++i) { |
| yOff[i] = rect.fTop + yOff[i]; |
| } |
| } else { |
| for (int i = 0; i < kCornerPts; ++i) { |
| yOff[i] = rect.fBottom - yOff[i]; |
| } |
| } |
| |
| SkPoint lastPt; |
| SkAssertResult(path->getLastPt(&lastPt)); |
| if (lastPt.fX != xOff[0] || lastPt.fY != yOff[0]) { |
| path->lineTo(xOff[0], yOff[0]); |
| } |
| if (rx || ry) { |
| path->quadTo(xOff[1], yOff[1], xOff[2], yOff[2]); |
| path->quadTo(xOff[3], yOff[3], xOff[4], yOff[4]); |
| } else { |
| path->lineTo(xOff[2], yOff[2]); |
| path->lineTo(xOff[4], yOff[4]); |
| } |
| } |
| |
| void SkPath::addRRect(const SkRRect& rrect, Direction dir) { |
| assert_known_direction(dir); |
| |
| if (rrect.isEmpty()) { |
| return; |
| } |
| |
| const SkRect& bounds = rrect.getBounds(); |
| |
| if (rrect.isRect()) { |
| this->addRect(bounds, dir); |
| } else if (rrect.isOval()) { |
| this->addOval(bounds, dir); |
| } else { |
| fDirection = this->hasOnlyMoveTos() ? dir : kUnknown_Direction; |
| |
| SkAutoPathBoundsUpdate apbu(this, bounds); |
| SkAutoDisableDirectionCheck addc(this); |
| |
| this->incReserve(21); |
| if (kCW_Direction == dir) { |
| this->moveTo(bounds.fLeft, |
| bounds.fBottom - rrect.fRadii[SkRRect::kLowerLeft_Corner].fY); |
| add_corner_quads(this, rrect, SkRRect::kUpperLeft_Corner, dir); |
| add_corner_quads(this, rrect, SkRRect::kUpperRight_Corner, dir); |
| add_corner_quads(this, rrect, SkRRect::kLowerRight_Corner, dir); |
| add_corner_quads(this, rrect, SkRRect::kLowerLeft_Corner, dir); |
| } else { |
| this->moveTo(bounds.fLeft, |
| bounds.fTop + rrect.fRadii[SkRRect::kUpperLeft_Corner].fY); |
| add_corner_quads(this, rrect, SkRRect::kLowerLeft_Corner, dir); |
| add_corner_quads(this, rrect, SkRRect::kLowerRight_Corner, dir); |
| add_corner_quads(this, rrect, SkRRect::kUpperRight_Corner, dir); |
| add_corner_quads(this, rrect, SkRRect::kUpperLeft_Corner, dir); |
| } |
| this->close(); |
| } |
| } |
| |
| bool SkPath::hasOnlyMoveTos() const { |
| int count = fPathRef->countVerbs(); |
| const uint8_t* verbs = const_cast<const SkPathRef*>(fPathRef.get())->verbsMemBegin(); |
| for (int i = 0; i < count; ++i) { |
| if (*verbs == kLine_Verb || |
| *verbs == kQuad_Verb || |
| *verbs == kConic_Verb || |
| *verbs == kCubic_Verb) { |
| return false; |
| } |
| ++verbs; |
| } |
| return true; |
| } |
| |
| void SkPath::addRoundRect(const SkRect& rect, SkScalar rx, SkScalar ry, |
| Direction dir) { |
| assert_known_direction(dir); |
| |
| if (rx < 0 || ry < 0) { |
| SkErrorInternals::SetError( kInvalidArgument_SkError, |
| "I got %f and %f as radii to SkPath::AddRoundRect, " |
| "but negative radii are not allowed.", |
| SkScalarToDouble(rx), SkScalarToDouble(ry) ); |
| return; |
| } |
| |
| SkRRect rrect; |
| rrect.setRectXY(rect, rx, ry); |
| this->addRRect(rrect, dir); |
| } |
| |
| void SkPath::addOval(const SkRect& oval, Direction dir) { |
| assert_known_direction(dir); |
| |
| /* If addOval() is called after previous moveTo(), |
| this path is still marked as an oval. This is used to |
| fit into WebKit's calling sequences. |
| We can't simply check isEmpty() in this case, as additional |
| moveTo() would mark the path non empty. |
| */ |
| bool isOval = hasOnlyMoveTos(); |
| if (isOval) { |
| fDirection = dir; |
| } else { |
| fDirection = kUnknown_Direction; |
| } |
| |
| SkAutoDisableDirectionCheck addc(this); |
| |
| SkAutoPathBoundsUpdate apbu(this, oval); |
| |
| SkScalar cx = oval.centerX(); |
| SkScalar cy = oval.centerY(); |
| SkScalar rx = SkScalarHalf(oval.width()); |
| SkScalar ry = SkScalarHalf(oval.height()); |
| |
| SkScalar sx = SkScalarMul(rx, SK_ScalarTanPIOver8); |
| SkScalar sy = SkScalarMul(ry, SK_ScalarTanPIOver8); |
| SkScalar mx = SkScalarMul(rx, SK_ScalarRoot2Over2); |
| SkScalar my = SkScalarMul(ry, SK_ScalarRoot2Over2); |
| |
| /* |
| To handle imprecision in computing the center and radii, we revert to |
| the provided bounds when we can (i.e. use oval.fLeft instead of cx-rx) |
| to ensure that we don't exceed the oval's bounds *ever*, since we want |
| to use oval for our fast-bounds, rather than have to recompute it. |
| */ |
| const SkScalar L = oval.fLeft; // cx - rx |
| const SkScalar T = oval.fTop; // cy - ry |
| const SkScalar R = oval.fRight; // cx + rx |
| const SkScalar B = oval.fBottom; // cy + ry |
| |
| this->incReserve(17); // 8 quads + close |
| this->moveTo(R, cy); |
| if (dir == kCCW_Direction) { |
| this->quadTo( R, cy - sy, cx + mx, cy - my); |
| this->quadTo(cx + sx, T, cx , T); |
| this->quadTo(cx - sx, T, cx - mx, cy - my); |
| this->quadTo( L, cy - sy, L, cy ); |
| this->quadTo( L, cy + sy, cx - mx, cy + my); |
| this->quadTo(cx - sx, B, cx , B); |
| this->quadTo(cx + sx, B, cx + mx, cy + my); |
| this->quadTo( R, cy + sy, R, cy ); |
| } else { |
| this->quadTo( R, cy + sy, cx + mx, cy + my); |
| this->quadTo(cx + sx, B, cx , B); |
| this->quadTo(cx - sx, B, cx - mx, cy + my); |
| this->quadTo( L, cy + sy, L, cy ); |
| this->quadTo( L, cy - sy, cx - mx, cy - my); |
| this->quadTo(cx - sx, T, cx , T); |
| this->quadTo(cx + sx, T, cx + mx, cy - my); |
| this->quadTo( R, cy - sy, R, cy ); |
| } |
| this->close(); |
| |
| SkPathRef::Editor ed(&fPathRef); |
| |
| ed.setIsOval(isOval); |
| } |
| |
| void SkPath::addCircle(SkScalar x, SkScalar y, SkScalar r, Direction dir) { |
| if (r > 0) { |
| SkRect rect; |
| rect.set(x - r, y - r, x + r, y + r); |
| this->addOval(rect, dir); |
| } |
| } |
| |
| void SkPath::arcTo(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle, |
| bool forceMoveTo) { |
| if (oval.width() < 0 || oval.height() < 0) { |
| return; |
| } |
| |
| SkPoint pts[kSkBuildQuadArcStorage]; |
| int count = build_arc_points(oval, startAngle, sweepAngle, pts); |
| SkASSERT((count & 1) == 1); |
| |
| if (fPathRef->countVerbs() == 0) { |
| forceMoveTo = true; |
| } |
| this->incReserve(count); |
| forceMoveTo ? this->moveTo(pts[0]) : this->lineTo(pts[0]); |
| for (int i = 1; i < count; i += 2) { |
| this->quadTo(pts[i], pts[i+1]); |
| } |
| } |
| |
| void SkPath::addArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle) { |
| if (oval.isEmpty() || 0 == sweepAngle) { |
| return; |
| } |
| |
| const SkScalar kFullCircleAngle = SkIntToScalar(360); |
| |
| if (sweepAngle >= kFullCircleAngle || sweepAngle <= -kFullCircleAngle) { |
| this->addOval(oval, sweepAngle > 0 ? kCW_Direction : kCCW_Direction); |
| return; |
| } |
| |
| SkPoint pts[kSkBuildQuadArcStorage]; |
| int count = build_arc_points(oval, startAngle, sweepAngle, pts); |
| |
| SkDEBUGCODE(this->validate();) |
| SkASSERT(count & 1); |
| |
| fLastMoveToIndex = fPathRef->countPoints(); |
| |
| SkPathRef::Editor ed(&fPathRef, 1+(count-1)/2, count); |
| |
| ed.growForVerb(kMove_Verb)->set(pts[0].fX, pts[0].fY); |
| if (count > 1) { |
| SkPoint* p = ed.growForRepeatedVerb(kQuad_Verb, (count-1)/2); |
| memcpy(p, &pts[1], (count-1) * sizeof(SkPoint)); |
| } |
| |
| DIRTY_AFTER_EDIT; |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| /* |
| Need to handle the case when the angle is sharp, and our computed end-points |
| for the arc go behind pt1 and/or p2... |
| */ |
| void SkPath::arcTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar radius) { |
| SkVector before, after; |
| |
| // need to know our prev pt so we can construct tangent vectors |
| { |
| SkPoint start; |
| this->getLastPt(&start); |
| // Handle degenerate cases by adding a line to the first point and |
| // bailing out. |
| if ((x1 == start.fX && y1 == start.fY) || |
| (x1 == x2 && y1 == y2) || |
| radius == 0) { |
| this->lineTo(x1, y1); |
| return; |
| } |
| before.setNormalize(x1 - start.fX, y1 - start.fY); |
| after.setNormalize(x2 - x1, y2 - y1); |
| } |
| |
| SkScalar cosh = SkPoint::DotProduct(before, after); |
| SkScalar sinh = SkPoint::CrossProduct(before, after); |
| |
| if (SkScalarNearlyZero(sinh)) { // angle is too tight |
| this->lineTo(x1, y1); |
| return; |
| } |
| |
| SkScalar dist = SkScalarMulDiv(radius, SK_Scalar1 - cosh, sinh); |
| if (dist < 0) { |
| dist = -dist; |
| } |
| |
| SkScalar xx = x1 - SkScalarMul(dist, before.fX); |
| SkScalar yy = y1 - SkScalarMul(dist, before.fY); |
| SkRotationDirection arcDir; |
| |
| // now turn before/after into normals |
| if (sinh > 0) { |
| before.rotateCCW(); |
| after.rotateCCW(); |
| arcDir = kCW_SkRotationDirection; |
| } else { |
| before.rotateCW(); |
| after.rotateCW(); |
| arcDir = kCCW_SkRotationDirection; |
| } |
| |
| SkMatrix matrix; |
| SkPoint pts[kSkBuildQuadArcStorage]; |
| |
| matrix.setScale(radius, radius); |
| matrix.postTranslate(xx - SkScalarMul(radius, before.fX), |
| yy - SkScalarMul(radius, before.fY)); |
| |
| int count = SkBuildQuadArc(before, after, arcDir, &matrix, pts); |
| |
| this->incReserve(count); |
| // [xx,yy] == pts[0] |
| this->lineTo(xx, yy); |
| for (int i = 1; i < count; i += 2) { |
| this->quadTo(pts[i], pts[i+1]); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPath::addPath(const SkPath& path, SkScalar dx, SkScalar dy, AddPathMode mode) { |
| SkMatrix matrix; |
| |
| matrix.setTranslate(dx, dy); |
| this->addPath(path, matrix, mode); |
| } |
| |
| void SkPath::addPath(const SkPath& path, const SkMatrix& matrix, AddPathMode mode) { |
| SkPathRef::Editor(&fPathRef, path.countVerbs(), path.countPoints()); |
| |
| RawIter iter(path); |
| SkPoint pts[4]; |
| Verb verb; |
| |
| SkMatrix::MapPtsProc proc = matrix.getMapPtsProc(); |
| bool firstVerb = true; |
| while ((verb = iter.next(pts)) != kDone_Verb) { |
| switch (verb) { |
| case kMove_Verb: |
| proc(matrix, &pts[0], &pts[0], 1); |
| if (firstVerb && mode == kExtend_AddPathMode && !isEmpty()) { |
| injectMoveToIfNeeded(); // In case last contour is closed |
| this->lineTo(pts[0]); |
| } else { |
| this->moveTo(pts[0]); |
| } |
| break; |
| case kLine_Verb: |
| proc(matrix, &pts[1], &pts[1], 1); |
| this->lineTo(pts[1]); |
| break; |
| case kQuad_Verb: |
| proc(matrix, &pts[1], &pts[1], 2); |
| this->quadTo(pts[1], pts[2]); |
| break; |
| case kConic_Verb: |
| proc(matrix, &pts[1], &pts[1], 2); |
| this->conicTo(pts[1], pts[2], iter.conicWeight()); |
| break; |
| case kCubic_Verb: |
| proc(matrix, &pts[1], &pts[1], 3); |
| this->cubicTo(pts[1], pts[2], pts[3]); |
| break; |
| case kClose_Verb: |
| this->close(); |
| break; |
| default: |
| SkDEBUGFAIL("unknown verb"); |
| } |
| firstVerb = false; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static int pts_in_verb(unsigned verb) { |
| static const uint8_t gPtsInVerb[] = { |
| 1, // kMove |
| 1, // kLine |
| 2, // kQuad |
| 2, // kConic |
| 3, // kCubic |
| 0, // kClose |
| 0 // kDone |
| }; |
| |
| SkASSERT(verb < SK_ARRAY_COUNT(gPtsInVerb)); |
| return gPtsInVerb[verb]; |
| } |
| |
| // ignore the last point of the 1st contour |
| void SkPath::reversePathTo(const SkPath& path) { |
| int i, vcount = path.fPathRef->countVerbs(); |
| // exit early if the path is empty, or just has a moveTo. |
| if (vcount < 2) { |
| return; |
| } |
| |
| SkPathRef::Editor(&fPathRef, vcount, path.countPoints()); |
| |
| const uint8_t* verbs = path.fPathRef->verbs(); |
| const SkPoint* pts = path.fPathRef->points(); |
| const SkScalar* conicWeights = path.fPathRef->conicWeights(); |
| |
| SkASSERT(verbs[~0] == kMove_Verb); |
| for (i = 1; i < vcount; ++i) { |
| unsigned v = verbs[~i]; |
| int n = pts_in_verb(v); |
| if (n == 0) { |
| break; |
| } |
| pts += n; |
| conicWeights += (SkPath::kConic_Verb == v); |
| } |
| |
| while (--i > 0) { |
| switch (verbs[~i]) { |
| case kLine_Verb: |
| this->lineTo(pts[-1].fX, pts[-1].fY); |
| break; |
| case kQuad_Verb: |
| this->quadTo(pts[-1].fX, pts[-1].fY, pts[-2].fX, pts[-2].fY); |
| break; |
| case kConic_Verb: |
| this->conicTo(pts[-1], pts[-2], *--conicWeights); |
| break; |
| case kCubic_Verb: |
| this->cubicTo(pts[-1].fX, pts[-1].fY, pts[-2].fX, pts[-2].fY, |
| pts[-3].fX, pts[-3].fY); |
| break; |
| default: |
| SkDEBUGFAIL("bad verb"); |
| break; |
| } |
| pts -= pts_in_verb(verbs[~i]); |
| } |
| } |
| |
| void SkPath::reverseAddPath(const SkPath& src) { |
| SkPathRef::Editor ed(&fPathRef, src.fPathRef->countPoints(), src.fPathRef->countVerbs()); |
| |
| const SkPoint* pts = src.fPathRef->pointsEnd(); |
| // we will iterator through src's verbs backwards |
| const uint8_t* verbs = src.fPathRef->verbsMemBegin(); // points at the last verb |
| const uint8_t* verbsEnd = src.fPathRef->verbs(); // points just past the first verb |
| const SkScalar* conicWeights = src.fPathRef->conicWeightsEnd(); |
| |
| bool needMove = true; |
| bool needClose = false; |
| while (verbs < verbsEnd) { |
| uint8_t v = *(verbs++); |
| int n = pts_in_verb(v); |
| |
| if (needMove) { |
| --pts; |
| this->moveTo(pts->fX, pts->fY); |
| needMove = false; |
| } |
| pts -= n; |
| switch (v) { |
| case kMove_Verb: |
| if (needClose) { |
| this->close(); |
| needClose = false; |
| } |
| needMove = true; |
| pts += 1; // so we see the point in "if (needMove)" above |
| break; |
| case kLine_Verb: |
| this->lineTo(pts[0]); |
| break; |
| case kQuad_Verb: |
| this->quadTo(pts[1], pts[0]); |
| break; |
| case kConic_Verb: |
| this->conicTo(pts[1], pts[0], *--conicWeights); |
| break; |
| case kCubic_Verb: |
| this->cubicTo(pts[2], pts[1], pts[0]); |
| break; |
| case kClose_Verb: |
| needClose = true; |
| break; |
| default: |
| SkDEBUGFAIL("unexpected verb"); |
| } |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPath::offset(SkScalar dx, SkScalar dy, SkPath* dst) const { |
| SkMatrix matrix; |
| |
| matrix.setTranslate(dx, dy); |
| this->transform(matrix, dst); |
| } |
| |
| #include "SkGeometry.h" |
| |
| static void subdivide_quad_to(SkPath* path, const SkPoint pts[3], |
| int level = 2) { |
| if (--level >= 0) { |
| SkPoint tmp[5]; |
| |
| SkChopQuadAtHalf(pts, tmp); |
| subdivide_quad_to(path, &tmp[0], level); |
| subdivide_quad_to(path, &tmp[2], level); |
| } else { |
| path->quadTo(pts[1], pts[2]); |
| } |
| } |
| |
| static void subdivide_cubic_to(SkPath* path, const SkPoint pts[4], |
| int level = 2) { |
| if (--level >= 0) { |
| SkPoint tmp[7]; |
| |
| SkChopCubicAtHalf(pts, tmp); |
| subdivide_cubic_to(path, &tmp[0], level); |
| subdivide_cubic_to(path, &tmp[3], level); |
| } else { |
| path->cubicTo(pts[1], pts[2], pts[3]); |
| } |
| } |
| |
| void SkPath::transform(const SkMatrix& matrix, SkPath* dst) const { |
| SkDEBUGCODE(this->validate();) |
| if (dst == NULL) { |
| dst = (SkPath*)this; |
| } |
| |
| if (matrix.hasPerspective()) { |
| SkPath tmp; |
| tmp.fFillType = fFillType; |
| |
| SkPath::Iter iter(*this, false); |
| SkPoint pts[4]; |
| SkPath::Verb verb; |
| |
| while ((verb = iter.next(pts, false)) != kDone_Verb) { |
| switch (verb) { |
| case kMove_Verb: |
| tmp.moveTo(pts[0]); |
| break; |
| case kLine_Verb: |
| tmp.lineTo(pts[1]); |
| break; |
| case kQuad_Verb: |
| subdivide_quad_to(&tmp, pts); |
| break; |
| case kConic_Verb: |
| SkDEBUGFAIL("TODO: compute new weight"); |
| tmp.conicTo(pts[1], pts[2], iter.conicWeight()); |
| break; |
| case kCubic_Verb: |
| subdivide_cubic_to(&tmp, pts); |
| break; |
| case kClose_Verb: |
| tmp.close(); |
| break; |
| default: |
| SkDEBUGFAIL("unknown verb"); |
| break; |
| } |
| } |
| |
| dst->swap(tmp); |
| SkPathRef::Editor ed(&dst->fPathRef); |
| matrix.mapPoints(ed.points(), ed.pathRef()->countPoints()); |
| dst->fDirection = kUnknown_Direction; |
| } else { |
| SkPathRef::CreateTransformedCopy(&dst->fPathRef, *fPathRef.get(), matrix); |
| |
| if (this != dst) { |
| dst->fFillType = fFillType; |
| dst->fConvexity = fConvexity; |
| } |
| |
| if (kUnknown_Direction == fDirection) { |
| dst->fDirection = kUnknown_Direction; |
| } else { |
| SkScalar det2x2 = |
| SkScalarMul(matrix.get(SkMatrix::kMScaleX), matrix.get(SkMatrix::kMScaleY)) - |
| SkScalarMul(matrix.get(SkMatrix::kMSkewX), matrix.get(SkMatrix::kMSkewY)); |
| if (det2x2 < 0) { |
| dst->fDirection = SkPath::OppositeDirection(static_cast<Direction>(fDirection)); |
| } else if (det2x2 > 0) { |
| dst->fDirection = fDirection; |
| } else { |
| dst->fConvexity = kUnknown_Convexity; |
| dst->fDirection = kUnknown_Direction; |
| } |
| } |
| |
| SkDEBUGCODE(dst->validate();) |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| enum SegmentState { |
| kEmptyContour_SegmentState, // The current contour is empty. We may be |
| // starting processing or we may have just |
| // closed a contour. |
| kAfterMove_SegmentState, // We have seen a move, but nothing else. |
| kAfterPrimitive_SegmentState // We have seen a primitive but not yet |
| // closed the path. Also the initial state. |
| }; |
| |
| SkPath::Iter::Iter() { |
| #ifdef SK_DEBUG |
| fPts = NULL; |
| fConicWeights = NULL; |
| fMoveTo.fX = fMoveTo.fY = fLastPt.fX = fLastPt.fY = 0; |
| fForceClose = fCloseLine = false; |
| fSegmentState = kEmptyContour_SegmentState; |
| #endif |
| // need to init enough to make next() harmlessly return kDone_Verb |
| fVerbs = NULL; |
| fVerbStop = NULL; |
| fNeedClose = false; |
| } |
| |
| SkPath::Iter::Iter(const SkPath& path, bool forceClose) { |
| this->setPath(path, forceClose); |
| } |
| |
| void SkPath::Iter::setPath(const SkPath& path, bool forceClose) { |
| fPts = path.fPathRef->points(); |
| fVerbs = path.fPathRef->verbs(); |
| fVerbStop = path.fPathRef->verbsMemBegin(); |
| fConicWeights = path.fPathRef->conicWeights() - 1; // begin one behind |
| fLastPt.fX = fLastPt.fY = 0; |
| fMoveTo.fX = fMoveTo.fY = 0; |
| fForceClose = SkToU8(forceClose); |
| fNeedClose = false; |
| fSegmentState = kEmptyContour_SegmentState; |
| } |
| |
| bool SkPath::Iter::isClosedContour() const { |
| if (fVerbs == NULL || fVerbs == fVerbStop) { |
| return false; |
| } |
| if (fForceClose) { |
| return true; |
| } |
| |
| const uint8_t* verbs = fVerbs; |
| const uint8_t* stop = fVerbStop; |
| |
| if (kMove_Verb == *(verbs - 1)) { |
| verbs -= 1; // skip the initial moveto |
| } |
| |
| while (verbs > stop) { |
| // verbs points one beyond the current verb, decrement first. |
| unsigned v = *(--verbs); |
| if (kMove_Verb == v) { |
| break; |
| } |
| if (kClose_Verb == v) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| SkPath::Verb SkPath::Iter::autoClose(SkPoint pts[2]) { |
| SkASSERT(pts); |
| if (fLastPt != fMoveTo) { |
| // A special case: if both points are NaN, SkPoint::operation== returns |
| // false, but the iterator expects that they are treated as the same. |
| // (consider SkPoint is a 2-dimension float point). |
| if (SkScalarIsNaN(fLastPt.fX) || SkScalarIsNaN(fLastPt.fY) || |
| SkScalarIsNaN(fMoveTo.fX) || SkScalarIsNaN(fMoveTo.fY)) { |
| return kClose_Verb; |
| } |
| |
| pts[0] = fLastPt; |
| pts[1] = fMoveTo; |
| fLastPt = fMoveTo; |
| fCloseLine = true; |
| return kLine_Verb; |
| } else { |
| pts[0] = fMoveTo; |
| return kClose_Verb; |
| } |
| } |
| |
| const SkPoint& SkPath::Iter::cons_moveTo() { |
| if (fSegmentState == kAfterMove_SegmentState) { |
| // Set the first return pt to the move pt |
| fSegmentState = kAfterPrimitive_SegmentState; |
| return fMoveTo; |
| } else { |
| SkASSERT(fSegmentState == kAfterPrimitive_SegmentState); |
| // Set the first return pt to the last pt of the previous primitive. |
| return fPts[-1]; |
| } |
| } |
| |
| void SkPath::Iter::consumeDegenerateSegments() { |
| // We need to step over anything that will not move the current draw point |
| // forward before the next move is seen |
| const uint8_t* lastMoveVerb = 0; |
| const SkPoint* lastMovePt = 0; |
| SkPoint lastPt = fLastPt; |
| while (fVerbs != fVerbStop) { |
| unsigned verb = *(fVerbs - 1); // fVerbs is one beyond the current verb |
| switch (verb) { |
| case kMove_Verb: |
| // Keep a record of this most recent move |
| lastMoveVerb = fVerbs; |
| lastMovePt = fPts; |
| lastPt = fPts[0]; |
| fVerbs--; |
| fPts++; |
| break; |
| |
| case kClose_Verb: |
| // A close when we are in a segment is always valid except when it |
| // follows a move which follows a segment. |
| if (fSegmentState == kAfterPrimitive_SegmentState && !lastMoveVerb) { |
| return; |
| } |
| // A close at any other time must be ignored |
| fVerbs--; |
| break; |
| |
| case kLine_Verb: |
| if (!IsLineDegenerate(lastPt, fPts[0])) { |
| if (lastMoveVerb) { |
| fVerbs = lastMoveVerb; |
| fPts = lastMovePt; |
| return; |
| } |
| return; |
| } |
| // Ignore this line and continue |
| fVerbs--; |
| fPts++; |
| break; |
| |
| case kConic_Verb: |
| case kQuad_Verb: |
| if (!IsQuadDegenerate(lastPt, fPts[0], fPts[1])) { |
| if (lastMoveVerb) { |
| fVerbs = lastMoveVerb; |
| fPts = lastMovePt; |
| return; |
| } |
| return; |
| } |
| // Ignore this line and continue |
| fVerbs--; |
| fPts += 2; |
| fConicWeights += (kConic_Verb == verb); |
| break; |
| |
| case kCubic_Verb: |
| if (!IsCubicDegenerate(lastPt, fPts[0], fPts[1], fPts[2])) { |
| if (lastMoveVerb) { |
| fVerbs = lastMoveVerb; |
| fPts = lastMovePt; |
| return; |
| } |
| return; |
| } |
| // Ignore this line and continue |
| fVerbs--; |
| fPts += 3; |
| break; |
| |
| default: |
| SkDEBUGFAIL("Should never see kDone_Verb"); |
| } |
| } |
| } |
| |
| SkPath::Verb SkPath::Iter::doNext(SkPoint ptsParam[4]) { |
| SkASSERT(ptsParam); |
| |
| if (fVerbs == fVerbStop) { |
| // Close the curve if requested and if there is some curve to close |
| if (fNeedClose && fSegmentState == kAfterPrimitive_SegmentState) { |
| if (kLine_Verb == this->autoClose(ptsParam)) { |
| return kLine_Verb; |
| } |
| fNeedClose = false; |
| return kClose_Verb; |
| } |
| return kDone_Verb; |
| } |
| |
| // fVerbs is one beyond the current verb, decrement first |
| unsigned verb = *(--fVerbs); |
| const SkPoint* SK_RESTRICT srcPts = fPts; |
| SkPoint* SK_RESTRICT pts = ptsParam; |
| |
| switch (verb) { |
| case kMove_Verb: |
| if (fNeedClose) { |
| fVerbs++; // move back one verb |
| verb = this->autoClose(pts); |
| if (verb == kClose_Verb) { |
| fNeedClose = false; |
| } |
| return (Verb)verb; |
| } |
| if (fVerbs == fVerbStop) { // might be a trailing moveto |
| return kDone_Verb; |
| } |
| fMoveTo = *srcPts; |
| pts[0] = *srcPts; |
| srcPts += 1; |
| fSegmentState = kAfterMove_SegmentState; |
| fLastPt = fMoveTo; |
| fNeedClose = fForceClose; |
| break; |
| case kLine_Verb: |
| pts[0] = this->cons_moveTo(); |
| pts[1] = srcPts[0]; |
| fLastPt = srcPts[0]; |
| fCloseLine = false; |
| srcPts += 1; |
| break; |
| case kConic_Verb: |
| fConicWeights += 1; |
| // fall-through |
| case kQuad_Verb: |
| pts[0] = this->cons_moveTo(); |
| memcpy(&pts[1], srcPts, 2 * sizeof(SkPoint)); |
| fLastPt = srcPts[1]; |
| srcPts += 2; |
| break; |
| case kCubic_Verb: |
| pts[0] = this->cons_moveTo(); |
| memcpy(&pts[1], srcPts, 3 * sizeof(SkPoint)); |
| fLastPt = srcPts[2]; |
| srcPts += 3; |
| break; |
| case kClose_Verb: |
| verb = this->autoClose(pts); |
| if (verb == kLine_Verb) { |
| fVerbs++; // move back one verb |
| } else { |
| fNeedClose = false; |
| fSegmentState = kEmptyContour_SegmentState; |
| } |
| fLastPt = fMoveTo; |
| break; |
| } |
| fPts = srcPts; |
| return (Verb)verb; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkPath::RawIter::RawIter() { |
| #ifdef SK_DEBUG |
| fPts = NULL; |
| fConicWeights = NULL; |
| fMoveTo.fX = fMoveTo.fY = fLastPt.fX = fLastPt.fY = 0; |
| #endif |
| // need to init enough to make next() harmlessly return kDone_Verb |
| fVerbs = NULL; |
| fVerbStop = NULL; |
| } |
| |
| SkPath::RawIter::RawIter(const SkPath& path) { |
| this->setPath(path); |
| } |
| |
| void SkPath::RawIter::setPath(const SkPath& path) { |
| fPts = path.fPathRef->points(); |
| fVerbs = path.fPathRef->verbs(); |
| fVerbStop = path.fPathRef->verbsMemBegin(); |
| fConicWeights = path.fPathRef->conicWeights() - 1; // begin one behind |
| fMoveTo.fX = fMoveTo.fY = 0; |
| fLastPt.fX = fLastPt.fY = 0; |
| } |
| |
| SkPath::Verb SkPath::RawIter::next(SkPoint pts[4]) { |
| SkASSERT(pts); |
| if (fVerbs == fVerbStop) { |
| return kDone_Verb; |
| } |
| |
| // fVerbs points one beyond next verb so decrement first. |
| unsigned verb = *(--fVerbs); |
| const SkPoint* srcPts = fPts; |
| |
| switch (verb) { |
| case kMove_Verb: |
| pts[0] = *srcPts; |
| fMoveTo = srcPts[0]; |
| fLastPt = fMoveTo; |
| srcPts += 1; |
| break; |
| case kLine_Verb: |
| pts[0] = fLastPt; |
| pts[1] = srcPts[0]; |
| fLastPt = srcPts[0]; |
| srcPts += 1; |
| break; |
| case kConic_Verb: |
| fConicWeights += 1; |
| // fall-through |
| case kQuad_Verb: |
| pts[0] = fLastPt; |
| memcpy(&pts[1], srcPts, 2 * sizeof(SkPoint)); |
| fLastPt = srcPts[1]; |
| srcPts += 2; |
| break; |
| case kCubic_Verb: |
| pts[0] = fLastPt; |
| memcpy(&pts[1], srcPts, 3 * sizeof(SkPoint)); |
| fLastPt = srcPts[2]; |
| srcPts += 3; |
| break; |
| case kClose_Verb: |
| fLastPt = fMoveTo; |
| pts[0] = fMoveTo; |
| break; |
| } |
| fPts = srcPts; |
| return (Verb)verb; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /* |
| Format in compressed buffer: [ptCount, verbCount, pts[], verbs[]] |
| */ |
| |
| size_t SkPath::writeToMemory(void* storage) const { |
| SkDEBUGCODE(this->validate();) |
| |
| if (NULL == storage) { |
| const int byteCount = sizeof(int32_t) + fPathRef->writeSize(); |
| return SkAlign4(byteCount); |
| } |
| |
| SkWBuffer buffer(storage); |
| |
| int32_t packed = (fConvexity << kConvexity_SerializationShift) | |
| (fFillType << kFillType_SerializationShift) | |
| (fDirection << kDirection_SerializationShift); |
| |
| buffer.write32(packed); |
| |
| fPathRef->writeToBuffer(&buffer); |
| |
| buffer.padToAlign4(); |
| return buffer.pos(); |
| } |
| |
| size_t SkPath::readFromMemory(const void* storage, size_t length) { |
| SkRBufferWithSizeCheck buffer(storage, length); |
| |
| int32_t packed; |
| if (!buffer.readS32(&packed)) { |
| return 0; |
| } |
| |
| fConvexity = (packed >> kConvexity_SerializationShift) & 0xFF; |
| fFillType = (packed >> kFillType_SerializationShift) & 0xFF; |
| fDirection = (packed >> kDirection_SerializationShift) & 0x3; |
| SkPathRef* pathRef = SkPathRef::CreateFromBuffer(&buffer); |
| |
| size_t sizeRead = 0; |
| if (buffer.isValid()) { |
| fPathRef.reset(pathRef); |
| SkDEBUGCODE(this->validate();) |
| buffer.skipToAlign4(); |
| sizeRead = buffer.pos(); |
| } else if (pathRef) { |
| // If the buffer is not valid, pathRef should be NULL |
| sk_throw(); |
| } |
| return sizeRead; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkString.h" |
| #include "SkStream.h" |
| |
| static void append_scalar(SkString* str, SkScalar value, bool dumpAsHex) { |
| if (dumpAsHex) { |
| str->appendf("SkBits2Float(0x%08x)", SkFloat2Bits(value)); |
| return; |
| } |
| SkString tmp; |
| tmp.printf("%g", value); |
| if (tmp.contains('.')) { |
| tmp.appendUnichar('f'); |
| } |
| str->append(tmp); |
| } |
| |
| static void append_params(SkString* str, const char label[], const SkPoint pts[], |
| int count, bool dumpAsHex, SkScalar conicWeight = -1) { |
| str->append(label); |
| str->append("("); |
| |
| const SkScalar* values = &pts[0].fX; |
| count *= 2; |
| |
| for (int i = 0; i < count; ++i) { |
| append_scalar(str, values[i], dumpAsHex); |
| if (i < count - 1) { |
| str->append(", "); |
| } |
| } |
| if (conicWeight >= 0) { |
| str->append(", "); |
| append_scalar(str, conicWeight, dumpAsHex); |
| } |
| str->append(");\n"); |
| } |
| |
| void SkPath::dump(SkWStream* wStream, bool forceClose, bool dumpAsHex) const { |
| Iter iter(*this, forceClose); |
| SkPoint pts[4]; |
| Verb verb; |
| |
| if (!wStream) { |
| SkDebugf("path: forceClose=%s\n", forceClose ? "true" : "false"); |
| } |
| SkString builder; |
| |
| while ((verb = iter.next(pts, false)) != kDone_Verb) { |
| switch (verb) { |
| case kMove_Verb: |
| append_params(&builder, "path.moveTo", &pts[0], 1, dumpAsHex); |
| break; |
| case kLine_Verb: |
| append_params(&builder, "path.lineTo", &pts[1], 1, dumpAsHex); |
| break; |
| case kQuad_Verb: |
| append_params(&builder, "path.quadTo", &pts[1], 2, dumpAsHex); |
| break; |
| case kConic_Verb: |
| append_params(&builder, "path.conicTo", &pts[1], 2, dumpAsHex, iter.conicWeight()); |
| break; |
| case kCubic_Verb: |
| append_params(&builder, "path.cubicTo", &pts[1], 3, dumpAsHex); |
| break; |
| case kClose_Verb: |
| builder.append("path.close();\n"); |
| break; |
| default: |
| SkDebugf(" path: UNKNOWN VERB %d, aborting dump...\n", verb); |
| verb = kDone_Verb; // stop the loop |
| break; |
| } |
| } |
| if (wStream) { |
| wStream->writeText(builder.c_str()); |
| } else { |
| SkDebugf("%s", builder.c_str()); |
| } |
| } |
| |
| void SkPath::dump() const { |
| this->dump(NULL, false, false); |
| } |
| |
| void SkPath::dumpHex() const { |
| this->dump(NULL, false, true); |
| } |
| |
| #ifdef SK_DEBUG |
| void SkPath::validate() const { |
| SkASSERT(this != NULL); |
| SkASSERT((fFillType & ~3) == 0); |
| |
| #ifdef SK_DEBUG_PATH |
| if (!fBoundsIsDirty) { |
| SkRect bounds; |
| |
| bool isFinite = compute_pt_bounds(&bounds, *fPathRef.get()); |
| SkASSERT(SkToBool(fIsFinite) == isFinite); |
| |
| if (fPathRef->countPoints() <= 1) { |
| // if we're empty, fBounds may be empty but translated, so we can't |
| // necessarily compare to bounds directly |
| // try path.addOval(2, 2, 2, 2) which is empty, but the bounds will |
| // be [2, 2, 2, 2] |
| SkASSERT(bounds.isEmpty()); |
| SkASSERT(fBounds.isEmpty()); |
| } else { |
| if (bounds.isEmpty()) { |
| SkASSERT(fBounds.isEmpty()); |
| } else { |
| if (!fBounds.isEmpty()) { |
| SkASSERT(fBounds.contains(bounds)); |
| } |
| } |
| } |
| } |
| #endif // SK_DEBUG_PATH |
| } |
| #endif // SK_DEBUG |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static int sign(SkScalar x) { return x < 0; } |
| #define kValueNeverReturnedBySign 2 |
| |
| enum DirChange { |
| kLeft_DirChange, |
| kRight_DirChange, |
| kStraight_DirChange, |
| kBackwards_DirChange, |
| |
| kInvalid_DirChange |
| }; |
| |
| |
| static bool almost_equal(SkScalar compA, SkScalar compB) { |
| // The error epsilon was empirically derived; worse case round rects |
| // with a mid point outset by 2x float epsilon in tests had an error |
| // of 12. |
| const int epsilon = 16; |
| if (!SkScalarIsFinite(compA) || !SkScalarIsFinite(compB)) { |
| return false; |
| } |
| // no need to check for small numbers because SkPath::Iter has removed degenerate values |
| int aBits = SkFloatAs2sCompliment(compA); |
| int bBits = SkFloatAs2sCompliment(compB); |
| return aBits < bBits + epsilon && bBits < aBits + epsilon; |
| } |
| |
| static DirChange direction_change(const SkPoint& lastPt, const SkVector& curPt, |
| const SkVector& lastVec, const SkVector& curVec) { |
| SkScalar cross = SkPoint::CrossProduct(lastVec, curVec); |
| |
| SkScalar smallest = SkTMin(curPt.fX, SkTMin(curPt.fY, SkTMin(lastPt.fX, lastPt.fY))); |
| SkScalar largest = SkTMax(curPt.fX, SkTMax(curPt.fY, SkTMax(lastPt.fX, lastPt.fY))); |
| largest = SkTMax(largest, -smallest); |
| |
| if (!almost_equal(largest, largest + cross)) { |
| int sign = SkScalarSignAsInt(cross); |
| if (sign) { |
| return (1 == sign) ? kRight_DirChange : kLeft_DirChange; |
| } |
| } |
| |
| if (!SkScalarNearlyZero(lastVec.lengthSqd(), SK_ScalarNearlyZero*SK_ScalarNearlyZero) && |
| !SkScalarNearlyZero(curVec.lengthSqd(), SK_ScalarNearlyZero*SK_ScalarNearlyZero) && |
| lastVec.dot(curVec) < 0.0f) { |
| return kBackwards_DirChange; |
| } |
| |
| return kStraight_DirChange; |
| } |
| |
| // only valid for a single contour |
| struct Convexicator { |
| Convexicator() |
| : fPtCount(0) |
| , fConvexity(SkPath::kConvex_Convexity) |
| , fDirection(SkPath::kUnknown_Direction) { |
| fExpectedDir = kInvalid_DirChange; |
| // warnings |
| fLastPt.set(0, 0); |
| fCurrPt.set(0, 0); |
| fLastVec.set(0, 0); |
| fFirstVec.set(0, 0); |
| |
| fDx = fDy = 0; |
| fSx = fSy = kValueNeverReturnedBySign; |
| } |
| |
| SkPath::Convexity getConvexity() const { return fConvexity; } |
| |
| /** The direction returned is only valid if the path is determined convex */ |
| SkPath::Direction getDirection() const { return fDirection; } |
| |
| void addPt(const SkPoint& pt) { |
| if (SkPath::kConcave_Convexity == fConvexity) { |
| return; |
| } |
| |
| if (0 == fPtCount) { |
| fCurrPt = pt; |
| ++fPtCount; |
| } else { |
| SkVector vec = pt - fCurrPt; |
| if (vec.fX || vec.fY) { |
| fLastPt = fCurrPt; |
| fCurrPt = pt; |
| if (++fPtCount == 2) { |
| fFirstVec = fLastVec = vec; |
| } else { |
| SkASSERT(fPtCount > 2); |
| this->addVec(vec); |
| } |
| |
| int sx = sign(vec.fX); |
| int sy = sign(vec.fY); |
| fDx += (sx != fSx); |
| fDy += (sy != fSy); |
| fSx = sx; |
| fSy = sy; |
| |
| if (fDx > 3 || fDy > 3) { |
| fConvexity = SkPath::kConcave_Convexity; |
| } |
| } |
| } |
| } |
| |
| void close() { |
| if (fPtCount > 2) { |
| this->addVec(fFirstVec); |
| } |
| } |
| |
| private: |
| void addVec(const SkVector& vec) { |
| SkASSERT(vec.fX || vec.fY); |
| DirChange dir = direction_change(fLastPt, fCurrPt, fLastVec, vec); |
| switch (dir) { |
| case kLeft_DirChange: // fall through |
| case kRight_DirChange: |
| if (kInvalid_DirChange == fExpectedDir) { |
| fExpectedDir = dir; |
| fDirection = (kRight_DirChange == dir) ? SkPath::kCW_Direction |
| : SkPath::kCCW_Direction; |
| } else if (dir != fExpectedDir) { |
| fConvexity = SkPath::kConcave_Convexity; |
| fDirection = SkPath::kUnknown_Direction; |
| } |
| fLastVec = vec; |
| break; |
| case kStraight_DirChange: |
| break; |
| case kBackwards_DirChange: |
| fLastVec = vec; |
| break; |
| case kInvalid_DirChange: |
| SkFAIL("Use of invalid direction change flag"); |
| break; |
| } |
| } |
| |
| SkPoint fLastPt; |
| SkPoint fCurrPt; |
| // fLastVec does not necessarily start at fLastPt. We only advance it when the cross product |
| // value with the current vec is deemed to be of a significant value. |
| SkVector fLastVec, fFirstVec; |
| int fPtCount; // non-degenerate points |
| DirChange fExpectedDir; |
| SkPath::Convexity fConvexity; |
| SkPath::Direction fDirection; |
| int fDx, fDy, fSx, fSy; |
| }; |
| |
| SkPath::Convexity SkPath::internalGetConvexity() const { |
| SkASSERT(kUnknown_Convexity == fConvexity); |
| SkPoint pts[4]; |
| SkPath::Verb verb; |
| SkPath::Iter iter(*this, true); |
| |
| int contourCount = 0; |
| int count; |
| Convexicator state; |
| |
| while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { |
| switch (verb) { |
| case kMove_Verb: |
| if (++contourCount > 1) { |
| fConvexity = kConcave_Convexity; |
| return kConcave_Convexity; |
| } |
| pts[1] = pts[0]; |
| count = 1; |
| break; |
| case kLine_Verb: count = 1; break; |
| case kQuad_Verb: count = 2; break; |
| case kConic_Verb: count = 2; break; |
| case kCubic_Verb: count = 3; break; |
| case kClose_Verb: |
| state.close(); |
| count = 0; |
| break; |
| default: |
| SkDEBUGFAIL("bad verb"); |
| fConvexity = kConcave_Convexity; |
| return kConcave_Convexity; |
| } |
| |
| for (int i = 1; i <= count; i++) { |
| state.addPt(pts[i]); |
| } |
| // early exit |
| if (kConcave_Convexity == state.getConvexity()) { |
| fConvexity = kConcave_Convexity; |
| return kConcave_Convexity; |
| } |
| } |
| fConvexity = state.getConvexity(); |
| if (kConvex_Convexity == fConvexity && kUnknown_Direction == fDirection) { |
| fDirection = state.getDirection(); |
| } |
| return static_cast<Convexity>(fConvexity); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class ContourIter { |
| public: |
| ContourIter(const SkPathRef& pathRef); |
| |
| bool done() const { return fDone; } |
| // if !done() then these may be called |
| int count() const { return fCurrPtCount; } |
| const SkPoint* pts() const { return fCurrPt; } |
| void next(); |
| |
| private: |
| int fCurrPtCount; |
| const SkPoint* fCurrPt; |
| const uint8_t* fCurrVerb; |
| const uint8_t* fStopVerbs; |
| const SkScalar* fCurrConicWeight; |
| bool fDone; |
| SkDEBUGCODE(int fContourCounter;) |
| }; |
| |
| ContourIter::ContourIter(const SkPathRef& pathRef) { |
| fStopVerbs = pathRef.verbsMemBegin(); |
| fDone = false; |
| fCurrPt = pathRef.points(); |
| fCurrVerb = pathRef.verbs(); |
| fCurrConicWeight = pathRef.conicWeights(); |
| fCurrPtCount = 0; |
| SkDEBUGCODE(fContourCounter = 0;) |
| this->next(); |
| } |
| |
| void ContourIter::next() { |
| if (fCurrVerb <= fStopVerbs) { |
| fDone = true; |
| } |
| if (fDone) { |
| return; |
| } |
| |
| // skip pts of prev contour |
| fCurrPt += fCurrPtCount; |
| |
| SkASSERT(SkPath::kMove_Verb == fCurrVerb[~0]); |
| int ptCount = 1; // moveTo |
| const uint8_t* verbs = fCurrVerb; |
| |
| for (--verbs; verbs > fStopVerbs; --verbs) { |
| switch (verbs[~0]) { |
| case SkPath::kMove_Verb: |
| goto CONTOUR_END; |
| case SkPath::kLine_Verb: |
| ptCount += 1; |
| break; |
| case SkPath::kConic_Verb: |
| fCurrConicWeight += 1; |
| // fall-through |
| case SkPath::kQuad_Verb: |
| ptCount += 2; |
| break; |
| case SkPath::kCubic_Verb: |
| ptCount += 3; |
| break; |
| case SkPath::kClose_Verb: |
| break; |
| default: |
| SkDEBUGFAIL("unexpected verb"); |
| break; |
| } |
| } |
| CONTOUR_END: |
| fCurrPtCount = ptCount; |
| fCurrVerb = verbs; |
| SkDEBUGCODE(++fContourCounter;) |
| } |
| |
| // returns cross product of (p1 - p0) and (p2 - p0) |
| static SkScalar cross_prod(const SkPoint& p0, const SkPoint& p1, const SkPoint& p2) { |
| SkScalar cross = SkPoint::CrossProduct(p1 - p0, p2 - p0); |
| // We may get 0 when the above subtracts underflow. We expect this to be |
| // very rare and lazily promote to double. |
| if (0 == cross) { |
| double p0x = SkScalarToDouble(p0.fX); |
| double p0y = SkScalarToDouble(p0.fY); |
| |
| double p1x = SkScalarToDouble(p1.fX); |
| double p1y = SkScalarToDouble(p1.fY); |
| |
| double p2x = SkScalarToDouble(p2.fX); |
| double p2y = SkScalarToDouble(p2.fY); |
| |
| cross = SkDoubleToScalar((p1x - p0x) * (p2y - p0y) - |
| (p1y - p0y) * (p2x - p0x)); |
| |
| } |
| return cross; |
| } |
| |
| // Returns the first pt with the maximum Y coordinate |
| static int find_max_y(const SkPoint pts[], int count) { |
| SkASSERT(count > 0); |
| SkScalar max = pts[0].fY; |
| int firstIndex = 0; |
| for (int i = 1; i < count; ++i) { |
| SkScalar y = pts[i].fY; |
| if (y > max) { |
| max = y; |
| firstIndex = i; |
| } |
| } |
| return firstIndex; |
| } |
| |
| static int find_diff_pt(const SkPoint pts[], int index, int n, int inc) { |
| int i = index; |
| for (;;) { |
| i = (i + inc) % n; |
| if (i == index) { // we wrapped around, so abort |
| break; |
| } |
| if (pts[index] != pts[i]) { // found a different point, success! |
| break; |
| } |
| } |
| return i; |
| } |
| |
| /** |
| * Starting at index, and moving forward (incrementing), find the xmin and |
| * xmax of the contiguous points that have the same Y. |
| */ |
| static int find_min_max_x_at_y(const SkPoint pts[], int index, int n, |
| int* maxIndexPtr) { |
| const SkScalar y = pts[index].fY; |
| SkScalar min = pts[index].fX; |
| SkScalar max = min; |
| int minIndex = index; |
| int maxIndex = index; |
| for (int i = index + 1; i < n; ++i) { |
| if (pts[i].fY != y) { |
| break; |
| } |
| SkScalar x = pts[i].fX; |
| if (x < min) { |
| min = x; |
| minIndex = i; |
| } else if (x > max) { |
| max = x; |
| maxIndex = i; |
| } |
| } |
| *maxIndexPtr = maxIndex; |
| return minIndex; |
| } |
| |
| static void crossToDir(SkScalar cross, SkPath::Direction* dir) { |
| *dir = cross > 0 ? SkPath::kCW_Direction : SkPath::kCCW_Direction; |
| } |
| |
| /* |
| * We loop through all contours, and keep the computed cross-product of the |
| * contour that contained the global y-max. If we just look at the first |
| * contour, we may find one that is wound the opposite way (correctly) since |
| * it is the interior of a hole (e.g. 'o'). Thus we must find the contour |
| * that is outer most (or at least has the global y-max) before we can consider |
| * its cross product. |
| */ |
| bool SkPath::cheapComputeDirection(Direction* dir) const { |
| if (kUnknown_Direction != fDirection) { |
| *dir = static_cast<Direction>(fDirection); |
| return true; |
| } |
| |
| // don't want to pay the cost for computing this if it |
| // is unknown, so we don't call isConvex() |
| if (kConvex_Convexity == this->getConvexityOrUnknown()) { |
| SkASSERT(kUnknown_Direction == fDirection); |
| *dir = static_cast<Direction>(fDirection); |
| return false; |
| } |
| |
| ContourIter iter(*fPathRef.get()); |
| |
| // initialize with our logical y-min |
| SkScalar ymax = this->getBounds().fTop; |
| SkScalar ymaxCross = 0; |
| |
| for (; !iter.done(); iter.next()) { |
| int n = iter.count(); |
| if (n < 3) { |
| continue; |
| } |
| |
| const SkPoint* pts = iter.pts(); |
| SkScalar cross = 0; |
| int index = find_max_y(pts, n); |
| if (pts[index].fY < ymax) { |
| continue; |
| } |
| |
| // If there is more than 1 distinct point at the y-max, we take the |
| // x-min and x-max of them and just subtract to compute the dir. |
| if (pts[(index + 1) % n].fY == pts[index].fY) { |
| int maxIndex; |
| int minIndex = find_min_max_x_at_y(pts, index, n, &maxIndex); |
| if (minIndex == maxIndex) { |
| goto TRY_CROSSPROD; |
| } |
| SkASSERT(pts[minIndex].fY == pts[index].fY); |
| SkASSERT(pts[maxIndex].fY == pts[index].fY); |
| SkASSERT(pts[minIndex].fX <= pts[maxIndex].fX); |
| // we just subtract the indices, and let that auto-convert to |
| // SkScalar, since we just want - or + to signal the direction. |
| cross = minIndex - maxIndex; |
| } else { |
| TRY_CROSSPROD: |
| // Find a next and prev index to use for the cross-product test, |
| // but we try to find pts that form non-zero vectors from pts[index] |
| // |
| // Its possible that we can't find two non-degenerate vectors, so |
| // we have to guard our search (e.g. all the pts could be in the |
| // same place). |
| |
| // we pass n - 1 instead of -1 so we don't foul up % operator by |
| // passing it a negative LH argument. |
| int prev = find_diff_pt(pts, index, n, n - 1); |
| if (prev == index) { |
| // completely degenerate, skip to next contour |
| continue; |
| } |
| int next = find_diff_pt(pts, index, n, 1); |
| SkASSERT(next != index); |
| cross = cross_prod(pts[prev], pts[index], pts[next]); |
| // if we get a zero and the points are horizontal, then we look at the spread in |
| // x-direction. We really should continue to walk away from the degeneracy until |
| // there is a divergence. |
| if (0 == cross && pts[prev].fY == pts[index].fY && pts[next].fY == pts[index].fY) { |
| // construct the subtract so we get the correct Direction below |
| cross = pts[index].fX - pts[next].fX; |
| } |
| } |
| |
| if (cross) { |
| // record our best guess so far |
| ymax = pts[index].fY; |
| ymaxCross = cross; |
| } |
| } |
| if (ymaxCross) { |
| crossToDir(ymaxCross, dir); |
| fDirection = *dir; |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static SkScalar eval_cubic_coeff(SkScalar A, SkScalar B, SkScalar C, |
| SkScalar D, SkScalar t) { |
| return SkScalarMulAdd(SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C), t, D); |
| } |
| |
| static SkScalar eval_cubic_pts(SkScalar c0, SkScalar c1, SkScalar c2, SkScalar c3, |
| SkScalar t) { |
| SkScalar A = c3 + 3*(c1 - c2) - c0; |
| SkScalar B = 3*(c2 - c1 - c1 + c0); |
| SkScalar C = 3*(c1 - c0); |
| SkScalar D = c0; |
| return eval_cubic_coeff(A, B, C, D, t); |
| } |
| |
| /* Given 4 cubic points (either Xs or Ys), and a target X or Y, compute the |
| t value such that cubic(t) = target |
| */ |
| static void chopMonoCubicAt(SkScalar c0, SkScalar c1, SkScalar c2, SkScalar c3, |
| SkScalar target, SkScalar* t) { |
| // SkASSERT(c0 <= c1 && c1 <= c2 && c2 <= c3); |
| SkASSERT(c0 < target && target < c3); |
| |
| SkScalar D = c0 - target; |
| SkScalar A = c3 + 3*(c1 - c2) - c0; |
| SkScalar B = 3*(c2 - c1 - c1 + c0); |
| SkScalar C = 3*(c1 - c0); |
| |
| const SkScalar TOLERANCE = SK_Scalar1 / 4096; |
| SkScalar minT = 0; |
| SkScalar maxT = SK_Scalar1; |
| SkScalar mid; |
| int i; |
| for (i = 0; i < 16; i++) { |
| mid = SkScalarAve(minT, maxT); |
| SkScalar delta = eval_cubic_coeff(A, B, C, D, mid); |
| if (delta < 0) { |
| minT = mid; |
| delta = -delta; |
| } else { |
| maxT = mid; |
| } |
| if (delta < TOLERANCE) { |
| break; |
| } |
| } |
| *t = mid; |
| } |
| |
| template <size_t N> static void find_minmax(const SkPoint pts[], |
| SkScalar* minPtr, SkScalar* maxPtr) { |
| SkScalar min, max; |
| min = max = pts[0].fX; |
| for (size_t i = 1; i < N; ++i) { |
| min = SkMinScalar(min, pts[i].fX); |
| max = SkMaxScalar(max, pts[i].fX); |
| } |
| *minPtr = min; |
| *maxPtr = max; |
| } |
| |
| static int winding_mono_cubic(const SkPoint pts[], SkScalar x, SkScalar y) { |
| SkPoint storage[4]; |
| |
| int dir = 1; |
| if (pts[0].fY > pts[3].fY) { |
| storage[0] = pts[3]; |
| storage[1] = pts[2]; |
| storage[2] = pts[1]; |
| storage[3] = pts[0]; |
| pts = storage; |
| dir = -1; |
| } |
| if (y < pts[0].fY || y >= pts[3].fY) { |
| return 0; |
| } |
| |
| // quickreject or quickaccept |
| SkScalar min, max; |
| find_minmax<4>(pts, &min, &max); |
| if (x < min) { |
| return 0; |
| } |
| if (x > max) { |
| return dir; |
| } |
| |
| // compute the actual x(t) value |
| SkScalar t; |
| chopMonoCubicAt(pts[0].fY, pts[1].fY, pts[2].fY, pts[3].fY, y, &t); |
| SkScalar xt = eval_cubic_pts(pts[0].fX, pts[1].fX, pts[2].fX, pts[3].fX, t); |
| return xt < x ? dir : 0; |
| } |
| |
| static int winding_cubic(const SkPoint pts[], SkScalar x, SkScalar y) { |
| SkPoint dst[10]; |
| int n = SkChopCubicAtYExtrema(pts, dst); |
| int w = 0; |
| for (int i = 0; i <= n; ++i) { |
| w += winding_mono_cubic(&dst[i * 3], x, y); |
| } |
| return w; |
| } |
| |
| static int winding_mono_quad(const SkPoint pts[], SkScalar x, SkScalar y) { |
| SkScalar y0 = pts[0].fY; |
| SkScalar y2 = pts[2].fY; |
| |
| int dir = 1; |
| if (y0 > y2) { |
| SkTSwap(y0, y2); |
| dir = -1; |
| } |
| if (y < y0 || y >= y2) { |
| return 0; |
| } |
| |
| // bounds check on X (not required. is it faster?) |
| #if 0 |
| if (pts[0].fX > x && pts[1].fX > x && pts[2].fX > x) { |
| return 0; |
| } |
| #endif |
| |
| SkScalar roots[2]; |
| int n = SkFindUnitQuadRoots(pts[0].fY - 2 * pts[1].fY + pts[2].fY, |
| 2 * (pts[1].fY - pts[0].fY), |
| pts[0].fY - y, |
| roots); |
| SkASSERT(n <= 1); |
| SkScalar xt; |
| if (0 == n) { |
| SkScalar mid = SkScalarAve(y0, y2); |
| // Need [0] and [2] if dir == 1 |
| // and [2] and [0] if dir == -1 |
| xt = y < mid ? pts[1 - dir].fX : pts[dir - 1].fX; |
| } else { |
| SkScalar t = roots[0]; |
| SkScalar C = pts[0].fX; |
| SkScalar A = pts[2].fX - 2 * pts[1].fX + C; |
| SkScalar B = 2 * (pts[1].fX - C); |
| xt = SkScalarMulAdd(SkScalarMulAdd(A, t, B), t, C); |
| } |
| return xt < x ? dir : 0; |
| } |
| |
| static bool is_mono_quad(SkScalar y0, SkScalar y1, SkScalar y2) { |
| // return SkScalarSignAsInt(y0 - y1) + SkScalarSignAsInt(y1 - y2) != 0; |
| if (y0 == y1) { |
| return true; |
| } |
| if (y0 < y1) { |
| return y1 <= y2; |
| } else { |
| return y1 >= y2; |
| } |
| } |
| |
| static int winding_quad(const SkPoint pts[], SkScalar x, SkScalar y) { |
| SkPoint dst[5]; |
| int n = 0; |
| |
| if (!is_mono_quad(pts[0].fY, pts[1].fY, pts[2].fY)) { |
| n = SkChopQuadAtYExtrema(pts, dst); |
| pts = dst; |
| } |
| int w = winding_mono_quad(pts, x, y); |
| if (n > 0) { |
| w += winding_mono_quad(&pts[2], x, y); |
| } |
| return w; |
| } |
| |
| static int winding_line(const SkPoint pts[], SkScalar x, SkScalar y) { |
| SkScalar x0 = pts[0].fX; |
| SkScalar y0 = pts[0].fY; |
| SkScalar x1 = pts[1].fX; |
| SkScalar y1 = pts[1].fY; |
| |
| SkScalar dy = y1 - y0; |
| |
| int dir = 1; |
| if (y0 > y1) { |
| SkTSwap(y0, y1); |
| dir = -1; |
| } |
| if (y < y0 || y >= y1) { |
| return 0; |
| } |
| |
| SkScalar cross = SkScalarMul(x1 - x0, y - pts[0].fY) - |
| SkScalarMul(dy, x - pts[0].fX); |
| |
| if (SkScalarSignAsInt(cross) == dir) { |
| dir = 0; |
| } |
| return dir; |
| } |
| |
| static bool contains_inclusive(const SkRect& r, SkScalar x, SkScalar y) { |
| return r.fLeft <= x && x <= r.fRight && r.fTop <= y && y <= r.fBottom; |
| } |
| |
| bool SkPath::contains(SkScalar x, SkScalar y) const { |
| bool isInverse = this->isInverseFillType(); |
| if (this->isEmpty()) { |
| return isInverse; |
| } |
| |
| if (!contains_inclusive(this->getBounds(), x, y)) { |
| return isInverse; |
| } |
| |
| SkPath::Iter iter(*this, true); |
| bool done = false; |
| int w = 0; |
| do { |
| SkPoint pts[4]; |
| switch (iter.next(pts, false)) { |
| case SkPath::kMove_Verb: |
| case SkPath::kClose_Verb: |
| break; |
| case SkPath::kLine_Verb: |
| w += winding_line(pts, x, y); |
| break; |
| case SkPath::kQuad_Verb: |
| w += winding_quad(pts, x, y); |
| break; |
| case SkPath::kConic_Verb: |
| SkASSERT(0); |
| break; |
| case SkPath::kCubic_Verb: |
| w += winding_cubic(pts, x, y); |
| break; |
| case SkPath::kDone_Verb: |
| done = true; |
| break; |
| } |
| } while (!done); |
| |
| switch (this->getFillType()) { |
| case SkPath::kEvenOdd_FillType: |
| case SkPath::kInverseEvenOdd_FillType: |
| w &= 1; |
| break; |
| default: |
| break; |
| } |
| return SkToBool(w); |
| } |