The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/utils/SkBoundaryPatch.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,79 @@
     1.4 +
     1.5 +/*
     1.6 + * Copyright 2011 Google Inc.
     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 +#include "SkBoundaryPatch.h"
    1.12 +
    1.13 +SkBoundaryPatch::SkBoundaryPatch() : fBoundary(NULL) {}
    1.14 +
    1.15 +SkBoundaryPatch::~SkBoundaryPatch() {
    1.16 +    SkSafeUnref(fBoundary);
    1.17 +}
    1.18 +
    1.19 +SkBoundary* SkBoundaryPatch::setBoundary(SkBoundary* b) {
    1.20 +    SkRefCnt_SafeAssign(fBoundary, b);
    1.21 +    return b;
    1.22 +}
    1.23 +
    1.24 +static SkPoint SkMakePoint(SkScalar x, SkScalar y) {
    1.25 +    SkPoint pt;
    1.26 +    pt.set(x, y);
    1.27 +    return pt;
    1.28 +}
    1.29 +
    1.30 +static SkPoint SkPointInterp(const SkPoint& a, const SkPoint& b, SkScalar t) {
    1.31 +    return SkMakePoint(SkScalarInterp(a.fX, b.fX, t),
    1.32 +                       SkScalarInterp(a.fY, b.fY, t));
    1.33 +}
    1.34 +
    1.35 +SkPoint SkBoundaryPatch::eval(SkScalar unitU, SkScalar unitV) {
    1.36 +    SkBoundary* b = fBoundary;
    1.37 +    SkPoint u = SkPointInterp(b->eval(SkBoundary::kLeft, SK_Scalar1 - unitV),
    1.38 +                              b->eval(SkBoundary::kRight, unitV),
    1.39 +                              unitU);
    1.40 +    SkPoint v = SkPointInterp(b->eval(SkBoundary::kTop, unitU),
    1.41 +                              b->eval(SkBoundary::kBottom, SK_Scalar1 - unitU),
    1.42 +                              unitV);
    1.43 +    return SkMakePoint(SkScalarAve(u.fX, v.fX),
    1.44 +                       SkScalarAve(u.fY, v.fY));
    1.45 +}
    1.46 +
    1.47 +bool SkBoundaryPatch::evalPatch(SkPoint verts[], int rows, int cols) {
    1.48 +    if (rows < 2 || cols < 2) {
    1.49 +        return false;
    1.50 +    }
    1.51 +
    1.52 +    const SkScalar invR = SkScalarInvert(SkIntToScalar(rows - 1));
    1.53 +    const SkScalar invC = SkScalarInvert(SkIntToScalar(cols - 1));
    1.54 +
    1.55 +    for (int y = 0; y < cols; y++) {
    1.56 +        SkScalar yy = y * invC;
    1.57 +        for (int x = 0; x < rows; x++) {
    1.58 +            *verts++ = this->eval(x * invR, yy);
    1.59 +        }
    1.60 +    }
    1.61 +    return true;
    1.62 +}
    1.63 +
    1.64 +////////////////////////////////////////////////////////////////////////
    1.65 +
    1.66 +#include "SkGeometry.h"
    1.67 +
    1.68 +SkPoint SkLineBoundary::eval(Edge e, SkScalar t) {
    1.69 +    SkASSERT((unsigned)e < 4);
    1.70 +    return SkPointInterp(fPts[e], fPts[(e + 1) & 3], t);
    1.71 +}
    1.72 +
    1.73 +SkPoint SkCubicBoundary::eval(Edge e, SkScalar t) {
    1.74 +    SkASSERT((unsigned)e < 4);
    1.75 +
    1.76 +    // ensure our 4th cubic wraps to the start of the first
    1.77 +    fPts[12] = fPts[0];
    1.78 +
    1.79 +    SkPoint loc;
    1.80 +    SkEvalCubicAt(&fPts[e * 3], t, &loc, NULL, NULL);
    1.81 +    return loc;
    1.82 +}