50 lines
1020 B
C
50 lines
1020 B
C
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkRSXform_DEFINED
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#define SkRSXform_DEFINED
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#include "SkScalar.h"
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/**
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* A compressed form of a rotation+scale matrix.
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*
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* [ fSCos -fSSin fTx ]
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* [ fSSin fSCos fTy ]
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* [ 0 0 1 ]
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*/
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struct SkRSXform {
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SkScalar fSCos;
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SkScalar fSSin;
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SkScalar fTx;
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SkScalar fTy;
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bool rectStaysRect() const {
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return 0 == fSCos || 0 == fSSin;
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}
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void setIdentity() {
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fSCos = 1;
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fSSin = fTx = fTy = 0;
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}
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void set(SkScalar scos, SkScalar ssin, SkScalar tx, SkScalar ty) {
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fSCos = scos;
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fSSin = ssin;
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fTx = tx;
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fTy = ty;
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}
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void toQuad(SkScalar width, SkScalar height, SkPoint quad[4]) const;
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void toQuad(const SkSize& size, SkPoint quad[4]) const {
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this->toQuad(size.width(), size.height(), quad);
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}
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};
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#endif
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