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
14class SkMatrix;
15class SkPaint;
16
17/**
18 * Given a matrix, size and paint, return true if the computed dst-rect would
19 * 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 */
25bool SkTreatAsSprite(const SkMatrix&, const SkISize& size, const SkPaint& paint);
26
27/** Decomposes the upper-left 2x2 of the matrix into a rotation (represented by
28 the cosine and sine of the rotation angle), followed by a non-uniform scale,
29 followed by another rotation. If there is a reflection, one of the scale
30 factors will be negative.
31 Returns true if successful. Returns false if the matrix is degenerate.
32 */
33bool SkDecomposeUpper2x2(const SkMatrix& matrix,
34 SkPoint* rotation1,
35 SkPoint* scale,
36 SkPoint* rotation2);
37
38#endif
39