1 /*
2  * Copyright 2010 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 GrRect_DEFINED
9 #define GrRect_DEFINED
10 
11 #include "SkTo.h"
12 #include "SkTypes.h"
13 #include "SkRect.h"
14 
15 struct GrIRect16 {
16     int16_t fLeft, fTop, fRight, fBottom;
17 
18     static GrIRect16 SK_WARN_UNUSED_RESULT MakeEmpty() {
19         GrIRect16 r;
20         r.setEmpty();
21         return r;
22     }
23 
24     static GrIRect16 SK_WARN_UNUSED_RESULT MakeWH(int16_t w, int16_t h) {
25         GrIRect16 r;
26         r.set(0, 0, w, h);
27         return r;
28     }
29 
30     static GrIRect16 SK_WARN_UNUSED_RESULT MakeXYWH(int16_t x, int16_t y, int16_t w, int16_t h) {
31         GrIRect16 r;
32         r.set(x, y, x + w, y + h);
33         return r;
34     }
35 
36     int width() const { return fRight - fLeft; }
37     int height() const { return fBottom - fTop; }
38     int area() const { return this->width() * this->height(); }
39     bool isEmpty() const { return fLeft >= fRight || fTop >= fBottom; }
40 
41     void setEmpty() { memset(this, 0, sizeof(*this)); }
42 
43     void set(int16_t left, int16_t top, int16_t right, int16_t bottom) {
44         fLeft = left;
45         fTop = top;
46         fRight = right;
47         fBottom = bottom;
48     }
49 
50     void set(const SkIRect& r) {
51         fLeft   = SkToS16(r.fLeft);
52         fTop    = SkToS16(r.fTop);
53         fRight  = SkToS16(r.fRight);
54         fBottom = SkToS16(r.fBottom);
55     }
56 };
57 
58 /** Returns true if the rectangles have a nonzero area of overlap. It assumed that rects can be
59     infinitely small but not "inverted". */
60 static inline bool GrRectsOverlap(const SkRect& a, const SkRect& b) {
61     // See skbug.com/6607 about the isFinite() checks.
62     SkASSERT(!a.isFinite() || (a.fLeft <= a.fRight && a.fTop <= a.fBottom));
63     SkASSERT(!b.isFinite() || (b.fLeft <= b.fRight && b.fTop <= b.fBottom));
64     return a.fRight > b.fLeft && a.fBottom > b.fTop && b.fRight > a.fLeft && b.fBottom > a.fTop;
65 }
66 
67 /** Returns true if the rectangles overlap or share an edge or corner. It assumed that rects can be
68     infinitely small but not "inverted". */
69 static inline bool GrRectsTouchOrOverlap(const SkRect& a, const SkRect& b) {
70     // See skbug.com/6607 about the isFinite() checks.
71     SkASSERT(!a.isFinite() || (a.fLeft <= a.fRight && a.fTop <= a.fBottom));
72     SkASSERT(!b.isFinite() || (b.fLeft <= b.fRight && b.fTop <= b.fBottom));
73     return a.fRight >= b.fLeft && a.fBottom >= b.fTop && b.fRight >= a.fLeft && b.fBottom >= a.fTop;
74 }
75 #endif
76