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-rw-r--r--src/gui/painting/qregion.cpp160
1 files changed, 88 insertions, 72 deletions
diff --git a/src/gui/painting/qregion.cpp b/src/gui/painting/qregion.cpp
index c4cd77a..55f009f 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -3167,6 +3167,7 @@ static void InsertEdgeInET(EdgeTable *ET, EdgeTableEntry *ETE, int scanline,
{
tmpSLLBlock =
(ScanLineListBlock *)malloc(sizeof(ScanLineListBlock));
+ Q_CHECK_PTR(tmpSLLBlock);
(*SLLBlock)->next = tmpSLLBlock;
tmpSLLBlock->next = (ScanLineListBlock *)NULL;
*SLLBlock = tmpSLLBlock;
@@ -3553,6 +3554,8 @@ static void PtsToRegion(register int numFullPtBlocks, register int iCurPtBlock,
* Scan converts a polygon by returning a run-length
* encoding of the resultant bitmap -- the run-length
* encoding is in the form of an array of rectangles.
+ *
+ * Can return 0 in case of errors.
*/
static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
//Point *Pts; /* the pts */
@@ -3624,75 +3627,28 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
}
- if (rule == EvenOddRule) {
- /*
- * for each scanline
- */
- for (y = ET.ymin; y < ET.ymax; ++y) {
-
- /*
- * Add a new edge to the active edge table when we
- * get to the next edge.
- */
- if (pSLL && y == pSLL->scanline) {
- loadAET(&AET, pSLL->edgelist);
- pSLL = pSLL->next;
- }
- pPrevAET = &AET;
- pAET = AET.next;
-
+ QT_TRY {
+ if (rule == EvenOddRule) {
/*
- * for each active edge
+ * for each scanline
*/
- while (pAET) {
- pts->setX(pAET->bres.minor_axis);
- pts->setY(y);
- ++pts;
- ++iPts;
+ for (y = ET.ymin; y < ET.ymax; ++y) {
/*
- * send out the buffer
+ * Add a new edge to the active edge table when we
+ * get to the next edge.
*/
- if (iPts == NUMPTSTOBUFFER) {
- tmpPtBlock = (POINTBLOCK *)malloc(sizeof(POINTBLOCK));
- tmpPtBlock->pts = reinterpret_cast<QPoint *>(tmpPtBlock->data);
- curPtBlock->next = tmpPtBlock;
- curPtBlock = tmpPtBlock;
- pts = curPtBlock->pts;
- ++numFullPtBlocks;
- iPts = 0;
+ if (pSLL && y == pSLL->scanline) {
+ loadAET(&AET, pSLL->edgelist);
+ pSLL = pSLL->next;
}
- EVALUATEEDGEEVENODD(pAET, pPrevAET, y)
- }
- InsertionSort(&AET);
- }
- } else {
- /*
- * for each scanline
- */
- for (y = ET.ymin; y < ET.ymax; ++y) {
- /*
- * Add a new edge to the active edge table when we
- * get to the next edge.
- */
- if (pSLL && y == pSLL->scanline) {
- loadAET(&AET, pSLL->edgelist);
- computeWAET(&AET);
- pSLL = pSLL->next;
- }
- pPrevAET = &AET;
- pAET = AET.next;
- pWETE = pAET;
+ pPrevAET = &AET;
+ pAET = AET.next;
- /*
- * for each active edge
- */
- while (pAET) {
/*
- * add to the buffer only those edges that
- * are in the Winding active edge table.
+ * for each active edge
*/
- if (pWETE == pAET) {
+ while (pAET) {
pts->setX(pAET->bres.minor_axis);
pts->setY(y);
++pts;
@@ -3702,7 +3658,8 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
* send out the buffer
*/
if (iPts == NUMPTSTOBUFFER) {
- tmpPtBlock = static_cast<POINTBLOCK *>(malloc(sizeof(POINTBLOCK)));
+ tmpPtBlock = (POINTBLOCK *)malloc(sizeof(POINTBLOCK));
+ Q_CHECK_PTR(tmpPtBlock);
tmpPtBlock->pts = reinterpret_cast<QPoint *>(tmpPtBlock->data);
curPtBlock->next = tmpPtBlock;
curPtBlock = tmpPtBlock;
@@ -3710,21 +3667,81 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
++numFullPtBlocks;
iPts = 0;
}
- pWETE = pWETE->nextWETE;
+ EVALUATEEDGEEVENODD(pAET, pPrevAET, y)
}
- EVALUATEEDGEWINDING(pAET, pPrevAET, y, fixWAET)
+ InsertionSort(&AET);
}
-
+ } else {
/*
- * recompute the winding active edge table if
- * we just resorted or have exited an edge.
+ * for each scanline
*/
- if (InsertionSort(&AET) || fixWAET) {
- computeWAET(&AET);
- fixWAET = false;
+ for (y = ET.ymin; y < ET.ymax; ++y) {
+ /*
+ * Add a new edge to the active edge table when we
+ * get to the next edge.
+ */
+ if (pSLL && y == pSLL->scanline) {
+ loadAET(&AET, pSLL->edgelist);
+ computeWAET(&AET);
+ pSLL = pSLL->next;
+ }
+ pPrevAET = &AET;
+ pAET = AET.next;
+ pWETE = pAET;
+
+ /*
+ * for each active edge
+ */
+ while (pAET) {
+ /*
+ * add to the buffer only those edges that
+ * are in the Winding active edge table.
+ */
+ if (pWETE == pAET) {
+ pts->setX(pAET->bres.minor_axis);
+ pts->setY(y);
+ ++pts;
+ ++iPts;
+
+ /*
+ * send out the buffer
+ */
+ if (iPts == NUMPTSTOBUFFER) {
+ tmpPtBlock = static_cast<POINTBLOCK *>(malloc(sizeof(POINTBLOCK)));
+ tmpPtBlock->pts = reinterpret_cast<QPoint *>(tmpPtBlock->data);
+ curPtBlock->next = tmpPtBlock;
+ curPtBlock = tmpPtBlock;
+ pts = curPtBlock->pts;
+ ++numFullPtBlocks;
+ iPts = 0;
+ }
+ pWETE = pWETE->nextWETE;
+ }
+ EVALUATEEDGEWINDING(pAET, pPrevAET, y, fixWAET)
+ }
+
+ /*
+ * recompute the winding active edge table if
+ * we just resorted or have exited an edge.
+ */
+ if (InsertionSort(&AET) || fixWAET) {
+ computeWAET(&AET);
+ fixWAET = false;
+ }
}
}
+ } QT_CATCH(...) {
+ FreeStorage(SLLBlock.next);
+ PtsToRegion(numFullPtBlocks, iPts, &FirstPtBlock, region);
+ for (curPtBlock = FirstPtBlock.next; --numFullPtBlocks >= 0;) {
+ tmpPtBlock = curPtBlock->next;
+ free(curPtBlock);
+ curPtBlock = tmpPtBlock;
+ }
+ free(pETEs);
+ return 0; // this function returns 0 in case of an error
}
+
FreeStorage(SLLBlock.next);
PtsToRegion(numFullPtBlocks, iPts, &FirstPtBlock, region);
for (curPtBlock = FirstPtBlock.next; --numFullPtBlocks >= 0;) {
@@ -3923,11 +3940,10 @@ QRegion &QRegion::operator=(const QRegion &r)
/*!
\internal
*/
-
QRegion QRegion::copy() const
{
QRegion r;
- QRegionData *x = new QRegionData;
+ QScopedPointer<QRegionData> x(new QRegionData);
x->ref = 1;
#if defined(Q_WS_X11)
x->rgn = 0;
@@ -3941,7 +3957,7 @@ QRegion QRegion::copy() const
x->qt_rgn = new QRegionPrivate;
if (!r.d->ref.deref())
cleanUp(r.d);
- r.d = x;
+ r.d = x.take();
return r;
}
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