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Guard against 0 tolerance in curve subdivision.

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git-svn-id: http://skia.googlecode.com/svn/trunk@1735 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
tomhudson@google.com 2011-06-28 15:19:32 +00:00
parent 9ac4a89d35
commit c10a88825d
2 changed files with 42 additions and 16 deletions
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23
gpu/src/GrPathUtils.cpp
View File

@ -18,11 +18,17 @@
#include "GrPoint.h"
static const int MAX_POINTS_PER_CURVE = 1 << 10;
const GrScalar GrPathUtils::gMinCurveTol (GrFloatToScalar(0.0001f));
uint32_t GrPathUtils::quadraticPointCount(const GrPoint points[],
GrScalar tol) {
if (tol < gMinCurveTol) {
tol == gMinCurveTol;
}
GrAssert(tol > 0);
GrScalar d = points[1].distanceToLineSegmentBetween(points[0], points[2]);
if (d < tol) {
if (d <= tol) {
return 1;
} else {
// Each time we subdivide, d should be cut in 4. So we need to
@ -68,10 +74,16 @@ uint32_t GrPathUtils::generateQuadraticPoints(const GrPoint& p0,
uint32_t GrPathUtils::cubicPointCount(const GrPoint points[],
GrScalar tol) {
GrScalar d = GrMax(points[1].distanceToLineSegmentBetweenSqd(points[0], points[3]),
if (tol < gMinCurveTol) {
tol == gMinCurveTol;
}
GrAssert(tol > 0);
GrScalar d = GrMax(
points[1].distanceToLineSegmentBetweenSqd(points[0], points[3]),
points[2].distanceToLineSegmentBetweenSqd(points[0], points[3]));
d = SkScalarSqrt(d);
if (d < tol) {
if (d <= tol) {
return 1;
} else {
int temp = SkScalarCeil(SkScalarSqrt(SkScalarDiv(d, tol)));
@ -118,6 +130,11 @@ uint32_t GrPathUtils::generateCubicPoints(const GrPoint& p0,
int GrPathUtils::worstCasePointCount(const GrPath& path, int* subpaths,
GrScalar tol) {
if (tol < gMinCurveTol) {
tol == gMinCurveTol;
}
GrAssert(tol > 0);
int pointCount = 0;
*subpaths = 1;

9
gpu/src/GrPathUtils.h
View File

@ -26,9 +26,13 @@
*/
class GrPathUtils : public GrNoncopyable {
public:
/// Since we divide by tol if we're computing exact worst-case bounds,
/// very small tolerances will be increased to gMinCurveTol.
static int worstCasePointCount(const GrPath&,
int* subpaths,
GrScalar tol);
/// Since we divide by tol if we're computing exact worst-case bounds,
/// very small tolerances will be increased to gMinCurveTol.
static uint32_t quadraticPointCount(const GrPoint points[], GrScalar tol);
static uint32_t generateQuadraticPoints(const GrPoint& p0,
const GrPoint& p1,
@ -36,6 +40,8 @@ public:
GrScalar tolSqd,
GrPoint** points,
uint32_t pointsLeft);
/// Since we divide by tol if we're computing exact worst-case bounds,
/// very small tolerances will be increased to gMinCurveTol.
static uint32_t cubicPointCount(const GrPoint points[], GrScalar tol);
static uint32_t generateCubicPoints(const GrPoint& p0,
const GrPoint& p1,
@ -44,5 +50,8 @@ public:
GrScalar tolSqd,
GrPoint** points,
uint32_t pointsLeft);
private:
static const GrScalar gMinCurveTol;
};
#endif