Move unlikely-to-be-inlined code from SkPathRef.h to SkPathRef.cpp

src/core/SkPathRef.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBuffer.h"
 #include "SkPath.h"
 #include "SkPathRef.h"
 
 SK_DEFINE_INST_COUNT(SkPathRef);
 
-SkPoint* SkPathRef::Editor::growForVerb(int /*SkPath::Verb*/ verb) {
-    fPathRef->validate();
-    return fPathRef->growForVerb(verb);
+//////////////////////////////////////////////////////////////////////////////
+SkPathRef::Editor::Editor(SkAutoTUnref<SkPathRef>* pathRef,
+                          int incReserveVerbs,
+                          int incReservePoints)
+{
+    if ((*pathRef)->unique()) {
+        (*pathRef)->incReserve(incReserveVerbs, incReservePoints);
+    } else {
+        SkPathRef* copy = SkNEW(SkPathRef);
+        copy->copy(**pathRef, incReserveVerbs, incReservePoints);
+        pathRef->reset(copy);
+    }
+    fPathRef = *pathRef;
+    fPathRef->fGenerationID = 0;
+    SkDEBUGCODE(sk_atomic_inc(&fPathRef->fEditorsAttached);)
 }
 
 SkPoint* SkPathRef::Editor::growForConic(SkScalar w) {
     fPathRef->validate();
     SkPoint* pts = fPathRef->growForVerb(SkPath::kConic_Verb);
     *fPathRef->fConicWeights.append() = w;
     return pts;
 }
 
-SkPoint* SkPathRef::growForVerb(int /* SkPath::Verb*/ verb) {
-    this->validate();
-    int pCnt;
-    switch (verb) {
-        case SkPath::kMove_Verb:
-            pCnt = 1;
-            break;
-        case SkPath::kLine_Verb:
-            pCnt = 1;
-            break;
-        case SkPath::kQuad_Verb:
-            // fall through
-        case SkPath::kConic_Verb:
-            pCnt = 2;
-            break;
-        case SkPath::kCubic_Verb:
-            pCnt = 3;
-            break;
-        case SkPath::kClose_Verb:
-            pCnt = 0;
-            break;
-        case SkPath::kDone_Verb:
-            SkDEBUGFAIL("growForVerb called for kDone");
-            // fall through
-        default:
-            SkDEBUGFAIL("default is not reached");
-            pCnt = 0;
+void SkPathRef::Editor::grow(int newVerbs, int newPts, uint8_t** verbs, SkPoint** pts) {
+    SkASSERT(NULL != verbs);
+    SkASSERT(NULL != pts);
+    fPathRef->validate();
+    int oldVerbCnt = fPathRef->fVerbCnt;
+    int oldPointCnt = fPathRef->fPointCnt;
+    SkASSERT(verbs && pts);
+    fPathRef->grow(newVerbs, newPts);
+    *verbs = fPathRef->fVerbs - oldVerbCnt;
+    *pts = fPathRef->fPoints + oldPointCnt;
+    fPathRef->validate();
+}
+
+//////////////////////////////////////////////////////////////////////////////
+void SkPathRef::CreateTransformedCopy(SkAutoTUnref<SkPathRef>* dst,
+                                      const SkPathRef& src,
+                                      const SkMatrix& matrix) {
+    src.validate();
+    if (matrix.isIdentity()) {
+        if (*dst != &src) {
+            src.ref();
+            dst->reset(const_cast<SkPathRef*>(&src));
+            (*dst)->validate();
+        }
+        return;
     }
-    size_t space = sizeof(uint8_t) + pCnt * sizeof (SkPoint);
-    this->makeSpace(space);
-    this->fVerbs[~fVerbCnt] = verb;
-    SkPoint* ret = fPoints + fPointCnt;
-    fVerbCnt += 1;
-    fPointCnt += pCnt;
-    fFreeSpace -= space;
-    fBoundsIsDirty = true;  // this also invalidates fIsFinite
-    this->validate();
-    return ret;
+
+    bool dstUnique = (*dst)->unique();
+    if (!dstUnique) {
+        dst->reset(SkNEW(SkPathRef));
+        (*dst)->resetToSize(src.fVerbCnt, src.fPointCnt, src.fConicWeights.count());
+        memcpy((*dst)->verbsMemWritable(), src.verbsMemBegin(), src.fVerbCnt * sizeof(uint8_t));
+        (*dst)->fConicWeights = src.fConicWeights;
+    }
+
+    // Need to check this here in case (&src == dst)
+    bool canXformBounds = !src.fBoundsIsDirty && matrix.rectStaysRect() && src.countPoints() > 1;
+
+    matrix.mapPoints((*dst)->fPoints, src.points(), src.fPointCnt);
+
+    /*
+        *  Here we optimize the bounds computation, by noting if the bounds are
+        *  already known, and if so, we just transform those as well and mark
+        *  them as "known", rather than force the transformed path to have to
+        *  recompute them.
+        *
+        *  Special gotchas if the path is effectively empty (<= 1 point) or
+        *  if it is non-finite. In those cases bounds need to stay empty,
+        *  regardless of the matrix.
+        */
+    if (canXformBounds) {
+        (*dst)->fBoundsIsDirty = false;
+        if (src.fIsFinite) {
+            matrix.mapRect(&(*dst)->fBounds, src.fBounds);
+            if (!((*dst)->fIsFinite = (*dst)->fBounds.isFinite())) {
+                (*dst)->fBounds.setEmpty();
+            }
+        } else {
+            (*dst)->fIsFinite = false;
+            (*dst)->fBounds.setEmpty();
+        }
+    } else {
+        (*dst)->fBoundsIsDirty = true;
+    }
+
+    (*dst)->validate();
 }
 
 SkPathRef* SkPathRef::CreateFromBuffer(SkRBuffer* buffer
 #ifndef DELETE_THIS_CODE_WHEN_SKPS_ARE_REBUILT_AT_V14_AND_ALL_OTHER_INSTANCES_TOO
                                    , bool newFormat, int32_t oldPacked
 #endif
     ) {
     SkPathRef* ref = SkNEW(SkPathRef);
 #ifndef DELETE_THIS_CODE_WHEN_SKPS_ARE_REBUILT_AT_V14_AND_ALL_OTHER_INSTANCES_TOO
     if (newFormat) {
@@ skipping 17 matching lines @@
     SkASSERT(pointCount == ref->countPoints());
     SkASSERT(conicCount == ref->fConicWeights.count());
     buffer->read(ref->verbsMemWritable(), verbCount * sizeof(uint8_t));
     buffer->read(ref->fPoints, pointCount * sizeof(SkPoint));
     buffer->read(ref->fConicWeights.begin(), conicCount * sizeof(SkScalar));
     buffer->read(&ref->fBounds, sizeof(SkRect));
     ref->fBoundsIsDirty = false;
     return ref;
 }
 
-/**
- * Writes the path points and verbs to a buffer.
- */
+void SkPathRef::Rewind(SkAutoTUnref<SkPathRef>* pathRef) {
+    if ((*pathRef)->unique()) {
+        (*pathRef)->validate();
+        (*pathRef)->fBoundsIsDirty = true;  // this also invalidates fIsFinite
+        (*pathRef)->fVerbCnt = 0;
+        (*pathRef)->fPointCnt = 0;
+        (*pathRef)->fFreeSpace = (*pathRef)->currSize();
+        (*pathRef)->fGenerationID = 0;
+        (*pathRef)->fConicWeights.rewind();
+        (*pathRef)->validate();
+    } else {
+        int oldVCnt = (*pathRef)->countVerbs();
+        int oldPCnt = (*pathRef)->countPoints();
+        pathRef->reset(SkNEW(SkPathRef));
+        (*pathRef)->resetToSize(0, 0, 0, oldVCnt, oldPCnt);
+    }
+}
+
+bool SkPathRef::operator== (const SkPathRef& ref) const {
+    this->validate();
+    ref.validate();
+    bool genIDMatch = fGenerationID && fGenerationID == ref.fGenerationID;
+#ifdef SK_RELEASE
+    if (genIDMatch) {
+        return true;
+    }
+#endif
+    if (fPointCnt != ref.fPointCnt ||
+        fVerbCnt != ref.fVerbCnt) {
+        SkASSERT(!genIDMatch);
+        return false;
+    }
+    if (0 != memcmp(this->verbsMemBegin(),
+                    ref.verbsMemBegin(),
+                    ref.fVerbCnt * sizeof(uint8_t))) {
+        SkASSERT(!genIDMatch);
+        return false;
+    }
+    if (0 != memcmp(this->points(),
+                    ref.points(),
+                    ref.fPointCnt * sizeof(SkPoint))) {
+        SkASSERT(!genIDMatch);
+        return false;
+    }
+    if (fConicWeights != ref.fConicWeights) {
+        SkASSERT(!genIDMatch);
+        return false;
+    }
+    // We've done the work to determine that these are equal. If either has a zero genID, copy
+    // the other's. If both are 0 then genID() will compute the next ID.
+    if (0 == fGenerationID) {
+        fGenerationID = ref.genID();
+    } else if (0 == ref.fGenerationID) {
+        ref.fGenerationID = this->genID();
+    }
+    return true;
+}
+
 void SkPathRef::writeToBuffer(SkWBuffer* buffer) {
     this->validate();
     SkDEBUGCODE(size_t beforePos = buffer->pos();)
 
     // Call getBounds() to ensure (as a side-effect) that fBounds
     // and fIsFinite are computed.
     const SkRect& bounds = this->getBounds();
 
     int32_t packed = ((fIsFinite & 1) << kIsFinite_SerializationShift);
     buffer->write32(packed);
 
     // TODO: write gen ID here. Problem: We don't know if we're cross process or not from
     // SkWBuffer. Until this is fixed we write 0.
     buffer->write32(0);
     buffer->write32(fVerbCnt);
     buffer->write32(fPointCnt);
     buffer->write32(fConicWeights.count());
     buffer->write(verbsMemBegin(), fVerbCnt * sizeof(uint8_t));
     buffer->write(fPoints, fPointCnt * sizeof(SkPoint));
     buffer->write(fConicWeights.begin(), fConicWeights.bytes());
     buffer->write(&bounds, sizeof(bounds));
 
     SkASSERT(buffer->pos() - beforePos == (size_t) this->writeSize());
 }
+
+uint32_t SkPathRef::writeSize() {
+    return uint32_t(5 * sizeof(uint32_t) +
+                    fVerbCnt * sizeof(uint8_t) +
+                    fPointCnt * sizeof(SkPoint) +
+                    fConicWeights.bytes() +
+                    sizeof(SkRect));
+}
+
+void SkPathRef::copy(const SkPathRef& ref, 
+                     int additionalReserveVerbs, 
+                     int additionalReservePoints) {
+    this->validate();
+    this->resetToSize(ref.fVerbCnt, ref.fPointCnt, ref.fConicWeights.count(),
+                        additionalReserveVerbs, additionalReservePoints);
+    memcpy(this->verbsMemWritable(), ref.verbsMemBegin(), ref.fVerbCnt * sizeof(uint8_t));
+    memcpy(this->fPoints, ref.fPoints, ref.fPointCnt * sizeof(SkPoint));
+    fConicWeights = ref.fConicWeights;
+    // We could call genID() here to force a real ID (instead of 0). However, if we're making
+    // a copy then presumably we intend to make a modification immediately afterwards.
+    fGenerationID = ref.fGenerationID;
+    fBoundsIsDirty = ref.fBoundsIsDirty;
+    if (!fBoundsIsDirty) {
+        fBounds = ref.fBounds;
+        fIsFinite = ref.fIsFinite;
+    }
+    this->validate();
+}
+
+void SkPathRef::resetToSize(int verbCount, int pointCount, int conicCount,
+                            int reserveVerbs, int reservePoints) {
+    this->validate();
+    fBoundsIsDirty = true;      // this also invalidates fIsFinite
+    fGenerationID = 0;
+
+    size_t newSize = sizeof(uint8_t) * verbCount + sizeof(SkPoint) * pointCount;
+    size_t newReserve = sizeof(uint8_t) * reserveVerbs + sizeof(SkPoint) * reservePoints;
+    size_t minSize = newSize + newReserve;
+
+    ptrdiff_t sizeDelta = this->currSize() - minSize;
+
+    if (sizeDelta < 0 || static_cast<size_t>(sizeDelta) >= 3 * minSize) {
+        sk_free(fPoints);
+        fPoints = NULL;
+        fVerbs = NULL;
+        fFreeSpace = 0;
+        fVerbCnt = 0;
+        fPointCnt = 0;
+        this->makeSpace(minSize);
+        fVerbCnt = verbCount;
+        fPointCnt = pointCount;
+        fFreeSpace -= newSize;
+    } else {
+        fPointCnt = pointCount;
+        fVerbCnt = verbCount;
+        fFreeSpace = this->currSize() - minSize;
+    }
+    fConicWeights.setCount(conicCount);
+    this->validate();
+}
+
+void SkPathRef::grow(int newVerbs, int newPoints) {
+    this->validate();
+    size_t space = newVerbs * sizeof(uint8_t) + newPoints * sizeof (SkPoint);
+    this->makeSpace(space);
+    fVerbCnt += newVerbs;
+    fPointCnt += newPoints;
+    fFreeSpace -= space;
+    fBoundsIsDirty = true;  // this also invalidates fIsFinite
+    this->validate();
+}
+
+SkPoint* SkPathRef::growForVerb(int /* SkPath::Verb*/ verb) {
+    this->validate();
+    int pCnt;
+    switch (verb) {
+        case SkPath::kMove_Verb:
+            pCnt = 1;
+            break;
+        case SkPath::kLine_Verb:
+            pCnt = 1;
+            break;
+        case SkPath::kQuad_Verb:
+            // fall through
+        case SkPath::kConic_Verb:
+            pCnt = 2;
+            break;
+        case SkPath::kCubic_Verb:
+            pCnt = 3;
+            break;
+        case SkPath::kClose_Verb:
+            pCnt = 0;
+            break;
+        case SkPath::kDone_Verb:
+            SkDEBUGFAIL("growForVerb called for kDone");
+            // fall through
+        default:
+            SkDEBUGFAIL("default is not reached");
+            pCnt = 0;
+    }
+    size_t space = sizeof(uint8_t) + pCnt * sizeof (SkPoint);
+    this->makeSpace(space);
+    this->fVerbs[~fVerbCnt] = verb;
+    SkPoint* ret = fPoints + fPointCnt;
+    fVerbCnt += 1;
+    fPointCnt += pCnt;
+    fFreeSpace -= space;
+    fBoundsIsDirty = true;  // this also invalidates fIsFinite
+    this->validate();
+    return ret;
+}
+
+void SkPathRef::makeSpace(size_t size) {
+    this->validate();
+    ptrdiff_t growSize = size - fFreeSpace;
+    if (growSize <= 0) {
+        return;
+    }
+    size_t oldSize = this->currSize();
+    // round to next multiple of 8 bytes
+    growSize = (growSize + 7) & ~static_cast<size_t>(7);
+    // we always at least double the allocation
+    if (static_cast<size_t>(growSize) < oldSize) {
+        growSize = oldSize;
+    }
+    if (growSize < kMinSize) {
+        growSize = kMinSize;
+    }
+    size_t newSize = oldSize + growSize;
+    // Note that realloc could memcpy more than we need. It seems to be a win anyway. TODO:
+    // encapsulate this.
+    fPoints = reinterpret_cast<SkPoint*>(sk_realloc_throw(fPoints, newSize));
+    size_t oldVerbSize = fVerbCnt * sizeof(uint8_t);
+    void* newVerbsDst = reinterpret_cast<void*>(
+                            reinterpret_cast<intptr_t>(fPoints) + newSize - oldVerbSize);
+    void* oldVerbsSrc = reinterpret_cast<void*>(
+                            reinterpret_cast<intptr_t>(fPoints) + oldSize - oldVerbSize);
+    memmove(newVerbsDst, oldVerbsSrc, oldVerbSize);
+    fVerbs = reinterpret_cast<uint8_t*>(reinterpret_cast<intptr_t>(fPoints) + newSize);
+    fFreeSpace += growSize;
+    this->validate();
+}
+
+int32_t SkPathRef::genID() const {
+    SkASSERT(!fEditorsAttached);
+    if (!fGenerationID) {
+        if (0 == fPointCnt && 0 == fVerbCnt) {
+            fGenerationID = kEmptyGenID;
+        } else {
+            static int32_t  gPathRefGenerationID;
+            // do a loop in case our global wraps around, as we never want to return a 0 or the
+            // empty ID
+            do {
+                fGenerationID = sk_atomic_inc(&gPathRefGenerationID) + 1;
+            } while (fGenerationID <= kEmptyGenID);
+        }
+    }
+    return fGenerationID;
+}
+
+void SkPathRef::validate() const {
+    SkASSERT(static_cast<ptrdiff_t>(fFreeSpace) >= 0);
+    SkASSERT(reinterpret_cast<intptr_t>(fVerbs) - reinterpret_cast<intptr_t>(fPoints) >= 0);
+    SkASSERT((NULL == fPoints) == (NULL == fVerbs));
+    SkASSERT(!(NULL == fPoints && 0 != fFreeSpace));
+    SkASSERT(!(NULL == fPoints && 0 != fFreeSpace));
+    SkASSERT(!(NULL == fPoints && fPointCnt));
+    SkASSERT(!(NULL == fVerbs && fVerbCnt));
+    SkASSERT(this->currSize() ==
+                fFreeSpace + sizeof(SkPoint) * fPointCnt + sizeof(uint8_t) * fVerbCnt);
+
+#ifdef SK_DEBUG
+    if (!fBoundsIsDirty && !fBounds.isEmpty()) {
+        bool isFinite = true;
+        for (int i = 0; i < fPointCnt; ++i) {
+            SkASSERT(fPoints[i].fX >= fBounds.fLeft && fPoints[i].fX <= fBounds.fRight &&
+                        fPoints[i].fY >= fBounds.fTop && fPoints[i].fY <= fBounds.fBottom);
+            if (!fPoints[i].isFinite()) {
+                isFinite = false;
+            }
+        }
+        SkASSERT(SkToBool(fIsFinite) == isFinite);
+    }
+#endif
+}