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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBoundaryPatch.h"
SK_DEFINE_INST_COUNT(SkBoundary)
SkBoundaryPatch::SkBoundaryPatch() : fBoundary(NULL) {}
SkBoundaryPatch::~SkBoundaryPatch() {
SkSafeUnref(fBoundary);
}
SkBoundary* SkBoundaryPatch::setBoundary(SkBoundary* b) {
SkRefCnt_SafeAssign(fBoundary, b);
return b;
}
static SkPoint SkMakePoint(SkScalar x, SkScalar y) {
SkPoint pt;
pt.set(x, y);
return pt;
}
static SkPoint SkPointInterp(const SkPoint& a, const SkPoint& b, SkScalar t) {
return SkMakePoint(SkScalarInterp(a.fX, b.fX, t),
SkScalarInterp(a.fY, b.fY, t));
}
SkPoint SkBoundaryPatch::eval(SkScalar unitU, SkScalar unitV) {
SkBoundary* b = fBoundary;
SkPoint u = SkPointInterp(b->eval(SkBoundary::kLeft, SK_Scalar1 - unitV),
b->eval(SkBoundary::kRight, unitV),
unitU);
SkPoint v = SkPointInterp(b->eval(SkBoundary::kTop, unitU),
b->eval(SkBoundary::kBottom, SK_Scalar1 - unitU),
unitV);
return SkMakePoint(SkScalarAve(u.fX, v.fX),
SkScalarAve(u.fY, v.fY));
}
bool SkBoundaryPatch::evalPatch(SkPoint verts[], int rows, int cols) {
if (rows < 2 || cols < 2) {
return false;
}
const SkScalar invR = SkScalarInvert(SkIntToScalar(rows - 1));
const SkScalar invC = SkScalarInvert(SkIntToScalar(cols - 1));
for (int y = 0; y < cols; y++) {
SkScalar yy = y * invC;
for (int x = 0; x < rows; x++) {
*verts++ = this->eval(x * invR, yy);
}
}
return true;
}
////////////////////////////////////////////////////////////////////////
#include "SkGeometry.h"
SkPoint SkLineBoundary::eval(Edge e, SkScalar t) {
SkASSERT((unsigned)e < 4);
return SkPointInterp(fPts[e], fPts[(e + 1) & 3], t);
}
SkPoint SkCubicBoundary::eval(Edge e, SkScalar t) {
SkASSERT((unsigned)e < 4);
// ensure our 4th cubic wraps to the start of the first
fPts[12] = fPts[0];
SkPoint loc;
SkEvalCubicAt(&fPts[e * 3], t, &loc, NULL, NULL);
return loc;
}
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