Staging for cleanup of SkPicture-related headers

src/core/SkBBHFactory.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 "SkBBHFactory.h"
+#include "SkPictureStateTree.h"
+#include "SkQuadTree.h"
+#include "SkRTree.h"
+#include "SkTileGrid.h"
+
+
+SkBBoxHierarchy* SkQuadTreeFactory::operator()(int width, int height) const {
+    return SkNEW_ARGS(SkQuadTree, (SkIRect::MakeWH(width, height)));
+}
+
+SkBBoxHierarchy* SkRTreeFactory::operator()(int width, int height) const {
+    // These values were empirically determined to produce reasonable
+    // performance in most cases.
+    static const int kRTreeMinChildren = 6;
+    static const int kRTreeMaxChildren = 11;
+
+    SkScalar aspectRatio = SkScalarDiv(SkIntToScalar(width),
+                                       SkIntToScalar(height));
+    bool sortDraws = false;  // Do not sort draw calls when bulk loading.
+
+    return SkRTree::Create(kRTreeMinChildren, kRTreeMaxChildren,
+                           aspectRatio, sortDraws);
+}
+
+SkBBoxHierarchy* SkTileGridFactory::operator()(int width, int height) const {
+    SkASSERT(fInfo.fMargin.width() >= 0);
+    SkASSERT(fInfo.fMargin.height() >= 0);
+    // Note: SkIRects are non-inclusive of the right() column and bottom() row.
+    // For example, an SkIRect at 0,0 with a size of (1,1) will only have
+    // content at pixel (0,0) and will report left=0 and right=1, hence the
+    // "-1"s below.
+    int xTileCount = (width + fInfo.fTileInterval.width() - 1) / fInfo.fTileInterval.width();
+    int yTileCount = (height + fInfo.fTileInterval.height() - 1) / fInfo.fTileInterval.height();
+    return SkNEW_ARGS(SkTileGrid, (xTileCount, yTileCount, fInfo,
+                                    SkTileGridNextDatum<SkPictureStateTree::Draw>));
+}