some utils for rect and matrix

src/core/SkRasterizer.cpp

 
 /*
  * 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.
  */
 
 
 #include "SkRasterizer.h"
 #include "SkDraw.h"
 #include "SkMaskFilter.h"
 #include "SkPath.h"
 
 bool SkRasterizer::rasterize(const SkPath& fillPath, const SkMatrix& matrix,
                              const SkIRect* clipBounds, SkMaskFilter* filter,
                              SkMask* mask, SkMask::CreateMode mode) const {
     SkIRect storage;
 
     if (clipBounds && filter && SkMask::kJustRenderImage_CreateMode != mode) {
         SkIPoint    margin;
         SkMask      srcM, dstM;
 
         srcM.fFormat = SkMask::kA8_Format;
         srcM.fBounds.set(0, 0, 1, 1);
         srcM.fImage = NULL;
         if (!filter->filterMask(&dstM, srcM, matrix, &margin)) {
             return false;
         }
-        storage = *clipBounds;
-        storage.inset(-margin.fX, -margin.fY);
+        storage = clipBounds->makeOutset(margin.fX, margin.fY);
         clipBounds = &storage;
     }
 
     return this->onRasterize(fillPath, matrix, clipBounds, mask, mode);
 }
 
 /*  Our default implementation of the virtual method just scan converts
 */
 bool SkRasterizer::onRasterize(const SkPath& fillPath, const SkMatrix& matrix,
                              const SkIRect* clipBounds,
                              SkMask* mask, SkMask::CreateMode mode) const {
     SkPath  devPath;
 
     fillPath.transform(matrix, &devPath);
     return SkDraw::DrawToMask(devPath, clipBounds, NULL, NULL, mask, mode,
                               SkPaint::kFill_Style);
 }