add makeOffset and makeInset to SkRect

TBR=bsalomon

precursor for https://codereview.chromium.org/306013010

Author: reed@google.com

Review URL: https://codereview.chromium.org/306893012

1 files changed, 28 insertions, 0 deletions

diff --git a/include/core/SkRect.h b/include/core/SkRect.h
index fd8cb16020..2c155c477a 100644
--- a/include/core/SkRect.h
+++ b/include/core/SkRect.h
@@ -157,6 +157,20 @@ struct SK_API SkIRect {
         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.
     */
@@ -577,6 +591,20 @@ struct SK_API SkRect {
         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.
     */