SkPathRef.h File Reference

#include "include/core/SkArc.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypes.h"
#include "include/private/SkIDChangeListener.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkSpan_impl.h"
#include "include/private/base/SkTArray.h"
#include "include/private/base/SkTo.h"
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <tuple>

Go to the source code of this file.

Classes
struct	SkPathVerbAnalysis
class	SkPathRef
class	SkPathRef::Editor
class	SkPathRef::Iter

Functions
SkPathVerbAnalysis	sk_path_analyze_verbs (const uint8_t verbs[], int count)

Function Documentation

sk_path_analyze_verbs()

SkPathVerbAnalysis sk_path_analyze_verbs	(	const uint8_t	verbs[],
		int	count
	)

Definition at line 3515 of file SkPath.cpp.

                                                                             {
    SkPathVerbAnalysis info = {false, 0, 0, 0};
    bool needMove = true;
    bool invalid = false;
 
    if (verbCount >= (INT_MAX / 3)) SK_UNLIKELY {
        // A path with an extremely high number of quad, conic or cubic verbs could cause
        // `info.points` to overflow. To prevent against this, we reject extremely large paths. This
        // check is conservative and assumes the worst case (in particular, it assumes that every
        // verb consumes 3 points, which would only happen for a path composed entirely of cubics).
        // This limits us to 700 million verbs, which is large enough for any reasonable use case.
        invalid = true;
    } else {
        for (int i = 0; i < verbCount; ++i) {
            switch ((SkPathVerb)vbs[i]) {
                case SkPathVerb::kMove:
                    needMove = false;
                    info.points += 1;
                    break;
                case SkPathVerb::kLine:
                    invalid |= needMove;
                    info.segmentMask |= kLine_SkPathSegmentMask;
                    info.points += 1;
                    break;
                case SkPathVerb::kQuad:
                    invalid |= needMove;
                    info.segmentMask |= kQuad_SkPathSegmentMask;
                    info.points += 2;
                    break;
                case SkPathVerb::kConic:
                    invalid |= needMove;
                    info.segmentMask |= kConic_SkPathSegmentMask;
                    info.points += 2;
                    info.weights += 1;
                    break;
                case SkPathVerb::kCubic:
                    invalid |= needMove;
                    info.segmentMask |= kCubic_SkPathSegmentMask;
                    info.points += 3;
                    break;
                case SkPathVerb::kClose:
                    invalid |= needMove;
                    needMove = true;
                    break;
                default:
                    invalid = true;
                    break;
            }
        }
    }
    info.valid = !invalid;
    return info;
}