cobalt / cobalt / 3cd5432aaed8f14f27f66ade1b51aa71df939492 / . / third_party / skia / src / core / SkMatrixUtils.h

/* | |

* 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; | |

/** | |

* 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 SkPaint& paint); | |

/** 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); | |

#endif |