2 * Copyright 2012 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkPictureUtils_DEFINED
9 #define SkPictureUtils_DEFINED
11 #include "SkPicture.h"
12 #include "SkTDArray.h"
17 class SK_API SkPictureUtils {
20 * Given a rectangular visible "window" into the picture, return an array
21 * of SkPixelRefs that might intersect that area. To keep the call fast,
22 * the returned list is not guaranteed to be exact, so it may miss some,
23 * and it may return false positives.
25 * The pixelrefs returned in the SkData are already owned by the picture,
26 * so the returned pointers are only valid while the picture is in scope
27 * and remains unchanged.
29 static SkData* GatherPixelRefs(const SkPicture* pict, const SkRect& area);
32 * SkPixelRefContainer provides a base class for more elaborate pixel ref
33 * query structures (e.g., rtrees, quad-trees, etc.)
35 class SkPixelRefContainer : public SkRefCnt {
37 virtual void add(SkPixelRef* pr, const SkRect& rect) = 0;
39 // The returned array may contain duplicates
40 virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) = 0;
43 typedef SkRefCnt INHERITED;
46 // Simple query structure that just stores a linked list of pixel refs
48 class SkPixelRefsAndRectsList : public SkPixelRefContainer {
50 virtual void add(SkPixelRef* pr, const SkRect& rect) SK_OVERRIDE {
51 PixelRefAndRect *dst = fArray.append();
57 virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) SK_OVERRIDE {
58 for (int i = 0; i < fArray.count(); ++i) {
59 if (SkRect::Intersects(fArray[i].fRect, queryRect)) {
60 *result->append() = fArray[i].fPixelRef;
66 struct PixelRefAndRect {
67 SkPixelRef* fPixelRef;
71 SkTDArray<PixelRefAndRect> fArray;
73 typedef SkPixelRefContainer INHERITED;
77 * Fill the provided pixel ref container with the picture's pixel ref
78 * and rect information.
80 static void GatherPixelRefsAndRects(SkPicture* pict, SkPixelRefContainer* prCont);