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
MakeEmptyGrIRect1618 static GrIRect16 SK_WARN_UNUSED_RESULT MakeEmpty() {
19 GrIRect16 r;
20 r.setEmpty();
21 return r;
22 }
23
MakeWHGrIRect1624 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
MakeXYWHGrIRect1630 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
widthGrIRect1636 int width() const { return fRight - fLeft; }
heightGrIRect1637 int height() const { return fBottom - fTop; }
areaGrIRect1638 int area() const { return this->width() * this->height(); }
isEmptyGrIRect1639 bool isEmpty() const { return fLeft >= fRight || fTop >= fBottom; }
40
setEmptyGrIRect1641 void setEmpty() { memset(this, 0, sizeof(*this)); }
42
setGrIRect1643 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
setGrIRect1650 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". */
GrRectsOverlap(const SkRect & a,const SkRect & b)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". */
GrRectsTouchOrOverlap(const SkRect & a,const SkRect & b)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