1 /* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkMatrixUtils_DEFINED 9 #define SkMatrixUtils_DEFINED 10 11 #include "include/core/SkPoint.h" 12 #include "include/core/SkSize.h" 13 14 class SkMatrix; 15 struct SkSamplingOptions; 16 17 /** 18 * Given a matrix, size and an antialias setting, return true if the computed dst-rect 19 * would align such that there is a 1-to-1 coorspondence between src and dst pixels. 20 * This can be called by drawing code to see if drawBitmap can be turned into 21 * drawSprite (which is faster). 22 * 23 * The src-rect is defined to be { 0, 0, size.width(), size.height() } 24 */ 25 bool SkTreatAsSprite(const SkMatrix&, const SkISize& size, const SkSamplingOptions&, 26 bool isAntiAlias); 27 28 /** Decomposes the upper-left 2x2 of the matrix into a rotation (represented by 29 the cosine and sine of the rotation angle), followed by a non-uniform scale, 30 followed by another rotation. If there is a reflection, one of the scale 31 factors will be negative. 32 Returns true if successful. Returns false if the matrix is degenerate. 33 */ 34 bool SkDecomposeUpper2x2(const SkMatrix& matrix, 35 SkPoint* rotation1, 36 SkPoint* scale, 37 SkPoint* rotation2); 38 39 #endif 40