Implement crop rect for SkImageFilter

include/core/SkRect.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkRect_DEFINED
 #define SkRect_DEFINED
 
 #include "SkPoint.h"
 #include "SkSize.h"
 
 /** \struct SkIRect
 
     SkIRect holds four 32 bit integer coordinates for a rectangle
 */
 struct SK_API SkIRect {
     int32_t fLeft, fTop, fRight, fBottom;
 
     static SkIRect SK_WARN_UNUSED_RESULT MakeEmpty() {
         SkIRect r;
         r.setEmpty();
         return r;
     }
 
+    static SkIRect SK_WARN_UNUSED_RESULT MakeLargest() {
+        SkIRect r;
+        r.setLargest();
+        return r;
+    }
+
     static SkIRect SK_WARN_UNUSED_RESULT MakeWH(int32_t w, int32_t h) {
         SkIRect r;
         r.set(0, 0, w, h);
         return r;
     }
 
     static SkIRect SK_WARN_UNUSED_RESULT MakeSize(const SkISize& size) {
         SkIRect r;
         r.set(0, 0, size.width(), size.height());
         return r;
@@ skipping 48 matching lines @@
      *  This is a specific "truncation" of the average, which is different than
      *  (bottom + top) / 2 when the sum is negative.
      */
     int centerY() const { return (fBottom + fTop) >> 1; }
 
     /**
      *  Return true if the rectangle's width or height are <= 0
      */
     bool isEmpty() const { return fLeft >= fRight || fTop >= fBottom; }
 
+    bool isLargest() const { return SK_MinS32 == fLeft &&
+                                    SK_MinS32 == fTop &&
+                                    SK_MaxS32 == fRight &&
+                                    SK_MaxS32 == fBottom; }
+
     friend bool operator==(const SkIRect& a, const SkIRect& b) {
         return !memcmp(&a, &b, sizeof(a));
     }
 
     friend bool operator!=(const SkIRect& a, const SkIRect& b) {
         return !(a == b);
     }
 
     bool is16Bit() const {
         return  SkIsS16(fLeft) && SkIsS16(fTop) &&
@@ skipping 663 matching lines @@
      */
     void sort();
 
     /**
      *  cast-safe way to treat the rect as an array of (4) SkScalars.
      */
     const SkScalar* asScalars() const { return &fLeft; }
 };
 
 #endif