some utils for rect and matrix

src/fonts/SkTestScalerContext.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkDescriptor.h"
@@ skipping 196 matching lines @@
 
     uint16_t generateCharToGlyph(SkUnichar uni) SK_OVERRIDE {
         uint16_t glyph;
         (void) fFace->onCharsToGlyphs((const void *) &uni, SkTypeface::kUTF16_Encoding, &glyph, 1);
         return glyph;
     }
 
     void generateAdvance(SkGlyph* glyph) SK_OVERRIDE {
         fFace->getAdvance(glyph);
 
-        SkVector advance;
-        fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
-                      SkFixedToScalar(glyph->fAdvanceY), &advance);
+        const SkVector advance = fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
+                                               SkFixedToScalar(glyph->fAdvanceY));
         glyph->fAdvanceX = SkScalarToFixed(advance.fX);
         glyph->fAdvanceY = SkScalarToFixed(advance.fY);
     }
 
     void generateMetrics(SkGlyph* glyph) SK_OVERRIDE {
         fFace->getMetrics(glyph);
 
-        SkVector advance;
-        fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
-                      SkFixedToScalar(glyph->fAdvanceY), &advance);
+        const SkVector advance = fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
+                                               SkFixedToScalar(glyph->fAdvanceY));
         glyph->fAdvanceX = SkScalarToFixed(advance.fX);
         glyph->fAdvanceY = SkScalarToFixed(advance.fY);
 
         SkPath path;
         fFace->getPath(*glyph, &path);
         path.transform(fMatrix);
 
         SkRect storage;
         const SkPaint paint;
         const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
@@ skipping 48 matching lines @@
     }
 
 private:
     SkTestTypeface*  fFace;
     SkMatrix         fMatrix;
 };
 
 SkScalerContext* SkTestTypeface::onCreateScalerContext(const SkDescriptor* desc) const {
     return SkNEW_ARGS(SkTestScalerContext, (const_cast<SkTestTypeface*>(this), desc));
 }