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