add makeOffset and makeInset to SkRect

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
@@ skipping 139 matching lines @@
 
     /**
      *  Make the largest representable rectangle, but inverted (e.g. fLeft will
      *  be max 32bit and right will be min 32bit).
      */
     void setLargestInverted() {
         fLeft = fTop = SK_MaxS32;
         fRight = fBottom = SK_MinS32;
     }
 
+    /**
+     *  Return a new IRect, built as an offset of this rect.
+     */
+    SkIRect makeOffset(int dx, int dy) const {
+        return MakeLTRB(fLeft + dx, fTop + dy, fRight + dx, fBottom + dy);
+    }
+
+    /**
+     *  Return a new IRect, built as an inset of this rect.
+     */
+    SkIRect makeInset(int dx, int dy) const {
+        return MakeLTRB(fLeft + dx, fTop + dy, fRight - dx, fBottom - dy);
+    }
+
     /** Offset set the rectangle by adding dx to its left and right,
         and adding dy to its top and bottom.
     */
     void offset(int32_t dx, int32_t dy) {
         fLeft   += dx;
         fTop    += dy;
         fRight  += dx;
         fBottom += dy;
     }
 
@@ skipping 400 matching lines @@
 
     /**
      *  Make the largest representable rectangle, but inverted (e.g. fLeft will
      *  be max and right will be min).
      */
     void setLargestInverted() {
         fLeft = fTop = SK_ScalarMax;
         fRight = fBottom = SK_ScalarMin;
     }
 
+    /**
+     *  Return a new Rect, built as an offset of this rect.
+     */
+    SkRect makeOffset(SkScalar dx, SkScalar dy) const {
+        return MakeLTRB(fLeft + dx, fTop + dy, fRight + dx, fBottom + dy);
+    }
+
+    /**
+     *  Return a new Rect, built as an inset of this rect.
+     */
+    SkRect makeInset(SkScalar dx, SkScalar dy) const {
+        return MakeLTRB(fLeft + dx, fTop + dy, fRight - dx, fBottom - dy);
+    }
+
     /** Offset set the rectangle by adding dx to its left and right,
         and adding dy to its top and bottom.
     */
     void offset(SkScalar dx, SkScalar dy) {
         fLeft   += dx;
         fTop    += dy;
         fRight  += dx;
         fBottom += dy;
     }
 
@@ skipping 211 matching lines @@
      */
     void sort();
 
     /**
      *  cast-safe way to treat the rect as an array of (4) SkScalars.
      */
     const SkScalar* asScalars() const { return &fLeft; }
 };
 
 #endif