1 /*
2  * Copyright 2018 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 SkRectPriv_DEFINED
9 #define SkRectPriv_DEFINED
10 
11 #include "SkRect.h"
12 #include "SkMathPriv.h"
13 
14 class SkRectPriv {
15 public:
16     // Returns an irect that is very large, and can be safely round-trip with SkRect and still
17     // be considered non-empty (i.e. width/height > 0) even if we round-out the SkRect.
MakeILarge()18     static SkIRect MakeILarge() {
19         // SK_MaxS32 >> 1 seemed better, but it did not survive round-trip with SkRect and rounding.
20         // Also, 1 << 29 can be perfectly represented in float, while SK_MaxS32 >> 1 cannot.
21         const int32_t large = 1 << 29;
22         return { -large, -large, large, large };
23     }
24 
MakeILargestInverted()25     static SkIRect MakeILargestInverted() {
26         return { SK_MaxS32, SK_MaxS32, SK_MinS32, SK_MinS32 };
27     }
28 
MakeLargeS32()29     static SkRect MakeLargeS32() {
30         SkRect r;
31         r.set(MakeILarge());
32         return r;
33     }
34 
MakeLargest()35     static SkRect MakeLargest() {
36         return { SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax };
37     }
38 
MakeLargestInverted()39     static SkRect MakeLargestInverted() {
40         return { SK_ScalarMax, SK_ScalarMax, SK_ScalarMin, SK_ScalarMin };
41     }
42 
GrowToInclude(SkRect * r,const SkPoint & pt)43     static void GrowToInclude(SkRect* r, const SkPoint& pt) {
44         r->fLeft  =  SkMinScalar(pt.fX, r->fLeft);
45         r->fRight =  SkMaxScalar(pt.fX, r->fRight);
46         r->fTop    = SkMinScalar(pt.fY, r->fTop);
47         r->fBottom = SkMaxScalar(pt.fY, r->fBottom);
48     }
49 
50     // Conservative check if r can be expressed in fixed-point.
51     // Will return false for very large values that might have fit
FitsInFixed(const SkRect & r)52     static bool FitsInFixed(const SkRect& r) {
53         return SkFitsInFixed(r.fLeft) && SkFitsInFixed(r.fTop) &&
54                SkFitsInFixed(r.fRight) && SkFitsInFixed(r.fBottom);
55     }
56 };
57 
58 
59 #endif
60