Image filters: de-nest SkImageFilter::Cache and Cache::Key.

src/core/SkImageFilterCacheKey.h

-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkImageFilterCacheKey_DEFINED
-#define SkImageFilterCacheKey_DEFINED
-
-struct SkImageFilter::Cache::Key {
-    Key(const uint32_t uniqueID, const SkMatrix& matrix,
-        const SkIRect& clipBounds, uint32_t srcGenID, const SkIRect& srcSubset)
-        : fUniqueID(uniqueID)
-        , fMatrix(matrix)
-        , fClipBounds(clipBounds)
-        , fSrcGenID(srcGenID)
-        , fSrcSubset(srcSubset) {
-        // Assert that Key is tightly-packed, since it is hashed.
-        static_assert(sizeof(Key) == sizeof(uint32_t) + sizeof(SkMatrix) + sizeof(SkIRect) +
-                                     sizeof(uint32_t) + 4 * sizeof(int32_t),
-                                     "image_filter_key_tight_packing");
-        fMatrix.getType();  // force initialization of type, so hashes match
-    }
-
-    uint32_t fUniqueID;
-    SkMatrix fMatrix;
-    SkIRect fClipBounds;
-    uint32_t fSrcGenID;
-    SkIRect fSrcSubset;
-
-    bool operator==(const Key& other) const {
-        return fUniqueID == other.fUniqueID &&
-               fMatrix == other.fMatrix &&
-               fClipBounds == other.fClipBounds &&
-               fSrcGenID == other.fSrcGenID &&
-               fSrcSubset == other.fSrcSubset;
-    }
-};
-
-#endif