some utils for rect and matrix

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
 
@@ skipping 144 matching lines @@
      *  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 {
+    SkIRect makeOffset(int32_t dx, int32_t 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 {
+    SkIRect makeInset(int32_t dx, int32_t dy) const {
         return MakeLTRB(fLeft + dx, fTop + dy, fRight - dx, fBottom - dy);
     }
 
+    /**
+     *  Return a new Rect, built as an outset of this rect.
+     */
+    SkIRect makeOutset(int32_t dx, int32_t 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 415 matching lines @@
         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);
     }
 
+    /**
+     *  Return a new Rect, built as an outset of this rect.
+     */
+    SkRect makeOutset(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 267 matching lines @@
     void dumpHex() const { this->dump(true); }
 };
 
 inline bool SkIRect::contains(const SkRect& r) const {
     return  !r.isEmpty() && !this->isEmpty() &&     // check for empties
             (SkScalar)fLeft <= r.fLeft && (SkScalar)fTop <= r.fTop &&
             (SkScalar)fRight >= r.fRight && (SkScalar)fBottom >= r.fBottom;
 }
 
 #endif