/*
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* Copyright 2013 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 SkMatrixUtils_DEFINED
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#define SkMatrixUtils_DEFINED
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#include "SkPoint.h"
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#include "SkSize.h"
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class SkMatrix;
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class SkPaint;
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/**
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* Given a matrix, size and paint, return true if the computed dst-rect would
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* align such that there is a 1-to-1 coorspondence between src and dst pixels.
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* This can be called by drawing code to see if drawBitmap can be turned into
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* drawSprite (which is faster).
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*
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* The src-rect is defined to be { 0, 0, size.width(), size.height() }
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*/
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bool SkTreatAsSprite(const SkMatrix&, const SkISize& size, const SkPaint& paint);
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/** Decomposes the upper-left 2x2 of the matrix into a rotation (represented by
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the cosine and sine of the rotation angle), followed by a non-uniform scale,
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followed by another rotation. If there is a reflection, one of the scale
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factors will be negative.
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Returns true if successful. Returns false if the matrix is degenerate.
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*/
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bool SkDecomposeUpper2x2(const SkMatrix& matrix,
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SkPoint* rotation1,
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SkPoint* scale,
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SkPoint* rotation2);
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#endif
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