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      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