The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/effects/SkDiscretePathEffect.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,83 @@
     1.4 +
     1.5 +/*
     1.6 + * Copyright 2006 The Android Open Source Project
     1.7 + *
     1.8 + * Use of this source code is governed by a BSD-style license that can be
     1.9 + * found in the LICENSE file.
    1.10 + */
    1.11 +
    1.12 +
    1.13 +#include "SkDiscretePathEffect.h"
    1.14 +#include "SkReadBuffer.h"
    1.15 +#include "SkWriteBuffer.h"
    1.16 +#include "SkPathMeasure.h"
    1.17 +#include "SkRandom.h"
    1.18 +
    1.19 +static void Perterb(SkPoint* p, const SkVector& tangent, SkScalar scale) {
    1.20 +    SkVector normal = tangent;
    1.21 +    normal.rotateCCW();
    1.22 +    normal.setLength(scale);
    1.23 +    *p += normal;
    1.24 +}
    1.25 +
    1.26 +
    1.27 +SkDiscretePathEffect::SkDiscretePathEffect(SkScalar segLength, SkScalar deviation)
    1.28 +    : fSegLength(segLength), fPerterb(deviation)
    1.29 +{
    1.30 +}
    1.31 +
    1.32 +bool SkDiscretePathEffect::filterPath(SkPath* dst, const SkPath& src,
    1.33 +                                      SkStrokeRec* rec, const SkRect*) const {
    1.34 +    bool doFill = rec->isFillStyle();
    1.35 +
    1.36 +    SkPathMeasure   meas(src, doFill);
    1.37 +    uint32_t        seed = SkScalarRoundToInt(meas.getLength());
    1.38 +    SkLCGRandom     rand(seed ^ ((seed << 16) | (seed >> 16)));
    1.39 +    SkScalar        scale = fPerterb;
    1.40 +    SkPoint         p;
    1.41 +    SkVector        v;
    1.42 +
    1.43 +    do {
    1.44 +        SkScalar    length = meas.getLength();
    1.45 +
    1.46 +        if (fSegLength * (2 + doFill) > length) {
    1.47 +            meas.getSegment(0, length, dst, true);  // to short for us to mangle
    1.48 +        } else {
    1.49 +            int         n = SkScalarRoundToInt(length / fSegLength);
    1.50 +            SkScalar    delta = length / n;
    1.51 +            SkScalar    distance = 0;
    1.52 +
    1.53 +            if (meas.isClosed()) {
    1.54 +                n -= 1;
    1.55 +                distance += delta/2;
    1.56 +            }
    1.57 +
    1.58 +            if (meas.getPosTan(distance, &p, &v)) {
    1.59 +                Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale));
    1.60 +                dst->moveTo(p);
    1.61 +            }
    1.62 +            while (--n >= 0) {
    1.63 +                distance += delta;
    1.64 +                if (meas.getPosTan(distance, &p, &v)) {
    1.65 +                    Perterb(&p, v, SkScalarMul(rand.nextSScalar1(), scale));
    1.66 +                    dst->lineTo(p);
    1.67 +                }
    1.68 +            }
    1.69 +            if (meas.isClosed()) {
    1.70 +                dst->close();
    1.71 +            }
    1.72 +        }
    1.73 +    } while (meas.nextContour());
    1.74 +    return true;
    1.75 +}
    1.76 +
    1.77 +void SkDiscretePathEffect::flatten(SkWriteBuffer& buffer) const {
    1.78 +    this->INHERITED::flatten(buffer);
    1.79 +    buffer.writeScalar(fSegLength);
    1.80 +    buffer.writeScalar(fPerterb);
    1.81 +}
    1.82 +
    1.83 +SkDiscretePathEffect::SkDiscretePathEffect(SkReadBuffer& buffer) {
    1.84 +    fSegLength = buffer.readScalar();
    1.85 +    fPerterb = buffer.readScalar();
    1.86 +}