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