api helpers inspired by blink use-cases

include/core/SkMatrix.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 SkMatrix_DEFINED
@@ skipping 351 matching lines @@
 
     /** Set the matrix to the scale and translate values that map the source
         rectangle to the destination rectangle, returning true if the the result
         can be represented.
         @param src the source rectangle to map from.
         @param dst the destination rectangle to map to.
         @param stf the ScaleToFit option
         @return true if the matrix can be represented by the rectangle mapping.
     */
     bool setRectToRect(const SkRect& src, const SkRect& dst, ScaleToFit stf);
+    static SkMatrix MakeRectToRect(const SkRect& src, const SkRect& dst, ScaleToFit stf) {
+        SkMatrix m;
+        m.setRectToRect(src, dst, stf);
+        return m;
+    }
 
     /** Set the matrix such that the specified src points would map to the
         specified dst points. count must be within [0..4].
         @param src  The array of src points
         @param dst  The array of dst points
         @param count The number of points to use for the transformation
         @return true if the matrix was set to the specified transformation
     */
     bool setPolyToPoly(const SkPoint src[], const SkPoint dst[], int count);
 
@@ skipping 434 matching lines @@
     static void Persp_pts(const SkMatrix&, SkPoint dst[], const SkPoint[], int);
 
     static void Affine_vpts(const SkMatrix&, SkPoint dst[], const SkPoint[], int);
 
     static const MapPtsProc gMapPtsProcs[];
 
     friend class SkPerspIter;
 };
 
 #endif