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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkNinePatchIter.h"
#include "SkRect.h"
bool SkNinePatchIter::Valid(int width, int height, const SkIRect& center) {
return !center.isEmpty() && SkIRect::MakeWH(width, height).contains(center);
}
SkNinePatchIter::SkNinePatchIter(int w, int h, const SkIRect& c, const SkRect& dst) {
SkASSERT(SkIRect::MakeWH(w, h).contains(c));
fSrcX[0] = 0;
fSrcX[1] = SkIntToScalar(c.fLeft);
fSrcX[2] = SkIntToScalar(c.fRight);
fSrcX[3] = SkIntToScalar(w);
fSrcY[0] = 0;
fSrcY[1] = SkIntToScalar(c.fTop);
fSrcY[2] = SkIntToScalar(c.fBottom);
fSrcY[3] = SkIntToScalar(h);
fDstX[0] = dst.fLeft;
fDstX[1] = dst.fLeft + SkIntToScalar(c.fLeft);
fDstX[2] = dst.fRight - SkIntToScalar(w - c.fRight);
fDstX[3] = dst.fRight;
fDstY[0] = dst.fTop;
fDstY[1] = dst.fTop + SkIntToScalar(c.fTop);
fDstY[2] = dst.fBottom - SkIntToScalar(h - c.fBottom);
fDstY[3] = dst.fBottom;
if (fDstX[1] > fDstX[2]) {
fDstX[1] = fDstX[0] + (fDstX[3] - fDstX[0]) * c.fLeft / (w - c.width());
fDstX[2] = fDstX[1];
}
if (fDstY[1] > fDstY[2]) {
fDstY[1] = fDstY[0] + (fDstY[3] - fDstY[0]) * c.fTop / (h - c.height());
fDstY[2] = fDstY[1];
}
fCurrX = fCurrY = 0;
fDone = false;
}
bool SkNinePatchIter::next(SkRect* src, SkRect* dst) {
if (fDone) {
return false;
}
const int x = fCurrX;
const int y = fCurrY;
SkASSERT(x >= 0 && x < 4);
SkASSERT(y >= 0 && y < 4);
src->set(fSrcX[x], fSrcY[y], fSrcX[x + 1], fSrcY[y + 1]);
dst->set(fDstX[x], fDstY[y], fDstX[x + 1], fDstY[y + 1]);
if (4 == ++fCurrX) {
fCurrX = 0;
fCurrY += 1;
if (fCurrY >= 4) {
fDone = true;
}
}
return true;
}
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