some utils for rect and matrix

src/effects/SkPerlinNoiseShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
@@ skipping 60 matching lines @@
     int fWrapX; // Minimum value to wrap.
     int fHeight;
     int fWrapY;
 };
 
 struct SkPerlinNoiseShader::PaintingData {
     PaintingData(const SkISize& tileSize, SkScalar seed,
                  SkScalar baseFrequencyX, SkScalar baseFrequencyY,
                  const SkMatrix& matrix)
     {
-        SkVector wavelength = SkVector::Make(SkScalarInvert(baseFrequencyX),
-                                             SkScalarInvert(baseFrequencyY));
-        matrix.mapVectors(&wavelength, 1);
-        fBaseFrequency.fX = SkScalarInvert(wavelength.fX);
-        fBaseFrequency.fY = SkScalarInvert(wavelength.fY);
-        SkVector sizeVec = SkVector::Make(SkIntToScalar(tileSize.fWidth),
-                                          SkIntToScalar(tileSize.fHeight));
-        matrix.mapVectors(&sizeVec, 1);
-        fTileSize.fWidth = SkScalarRoundToInt(sizeVec.fX);
-        fTileSize.fHeight = SkScalarRoundToInt(sizeVec.fY);
+        SkVector vec[2] = {
+            { SkScalarInvert(baseFrequencyX),   SkScalarInvert(baseFrequencyY)  },
+            { SkIntToScalar(tileSize.fWidth),   SkIntToScalar(tileSize.fHeight) },
+        };
+        matrix.mapVectors(vec, 2);
+
+        fBaseFrequency.set(SkScalarInvert(vec[0].fX), SkScalarInvert(vec[0].fY));
+        fTileSize.set(SkScalarRoundToInt(vec[1].fX), SkScalarRoundToInt(vec[1].fY));
         this->init(seed);
         if (!fTileSize.isEmpty()) {
             this->stitch();
         }
 
 #if SK_SUPPORT_GPU
         fPermutationsBitmap.setInfo(SkImageInfo::MakeA8(kBlockSize, 1));
         fPermutationsBitmap.setPixels(fLatticeSelector);
 
         fNoiseBitmap.setInfo(SkImageInfo::MakeN32Premul(kBlockSize, 4));
@@ skipping 933 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif