Add SkIRect::adjust method

Change-Id: Ib18d1a82944524e20d5d72912d8db7a823c470de
Reviewed-on: https://skia-review.googlesource.com/128884
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/core/SkRect.h b/include/core/SkRect.h
index d4a9c05c68..7b8e0032e5 100644
--- a/include/core/SkRect.h
+++ b/include/core/SkRect.h
@@ -413,6 +413,25 @@ struct SK_API SkIRect {
     */
     void outset(int32_t dx, int32_t dy)  { this->inset(-dx, -dy); }
 
+    /** Adjust SkIRect by adding dL to fLeft, dT to fTop, dR to fRight and fB to fBottom.
+
+        If dL is positive, narrows SkIRect on the left. If negative, widens it on the left.
+        If dT is positive, shrinks SkIRect on the top. If negative, lengthens it on the top.
+        If dR is positive, narrows SkIRect on the right. If negative, widens it on the right.
+        If dB is positive, shrinks SkIRect on the bottom. If negative, lengthens it on the bottom.
+
+        @param dL  offset added to fLeft
+        @param dT  offset added to fTop
+        @param dR  offset added to fRight
+        @param dB  offset added to fBottom
+    */
+    void adjust(int32_t dL, int32_t dT, int32_t dR, int32_t dB) {
+        fLeft   = Sk32_sat_add(fLeft,   dL);
+        fTop    = Sk32_sat_add(fTop,    dT);
+        fRight  = Sk32_sat_add(fRight,  dR);
+        fBottom = Sk32_sat_add(fBottom, dB);
+    }
+
     /** Returns true if: fLeft <= x < fRight && fTop <= y < fBottom.
         Returns false if SkIRect is empty.