reed@google.com | fe7b1ed | 2012-11-29 21:00:39 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #ifndef SkPictureUtils_DEFINED |
| 9 | #define SkPictureUtils_DEFINED |
| 10 | |
| 11 | #include "SkPicture.h" |
robertphillips@google.com | 56bf6e4 | 2014-01-13 13:33:26 +0000 | [diff] [blame^] | 12 | #include "SkTDArray.h" |
reed@google.com | fe7b1ed | 2012-11-29 21:00:39 +0000 | [diff] [blame] | 13 | |
| 14 | class SkData; |
| 15 | struct SkRect; |
| 16 | |
djsollen@google.com | fdabcb5 | 2012-12-05 06:15:42 +0000 | [diff] [blame] | 17 | class SK_API SkPictureUtils { |
reed@google.com | fe7b1ed | 2012-11-29 21:00:39 +0000 | [diff] [blame] | 18 | public: |
| 19 | /** |
| 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. |
| 24 | * |
| 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. |
| 28 | */ |
| 29 | static SkData* GatherPixelRefs(SkPicture* pict, const SkRect& area); |
robertphillips@google.com | 56bf6e4 | 2014-01-13 13:33:26 +0000 | [diff] [blame^] | 30 | |
| 31 | /** |
| 32 | * SkPixelRefContainer provides a base class for more elaborate pixel ref |
| 33 | * query structures (e.g., rtrees, quad-trees, etc.) |
| 34 | */ |
| 35 | class SkPixelRefContainer : public SkRefCnt { |
| 36 | public: |
| 37 | virtual void add(SkPixelRef* pr, const SkRect& rect) = 0; |
| 38 | |
| 39 | // The returned array may contain duplicates |
| 40 | virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) = 0; |
| 41 | |
| 42 | private: |
| 43 | typedef SkRefCnt INHERITED; |
| 44 | }; |
| 45 | |
| 46 | // Simple query structure that just stores a linked list of pixel refs |
| 47 | // and rects. |
| 48 | class SkPixelRefsAndRectsList : public SkPixelRefContainer { |
| 49 | public: |
| 50 | virtual void add(SkPixelRef* pr, const SkRect& rect) SK_OVERRIDE { |
| 51 | PixelRefAndRect *dst = fArray.append(); |
| 52 | |
| 53 | dst->fPixelRef = pr; |
| 54 | dst->fRect = rect; |
| 55 | } |
| 56 | |
| 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; |
| 61 | } |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | private: |
| 66 | struct PixelRefAndRect { |
| 67 | SkPixelRef* fPixelRef; |
| 68 | SkRect fRect; |
| 69 | }; |
| 70 | |
| 71 | SkTDArray<PixelRefAndRect> fArray; |
| 72 | |
| 73 | typedef SkPixelRefContainer INHERITED; |
| 74 | }; |
| 75 | |
| 76 | /** |
| 77 | * Fill the provided pixel ref container with the picture's pixel ref |
| 78 | * and rect information. |
| 79 | */ |
| 80 | static void GatherPixelRefsAndRects(SkPicture* pict, SkPixelRefContainer* prCont); |
reed@google.com | fe7b1ed | 2012-11-29 21:00:39 +0000 | [diff] [blame] | 81 | }; |
| 82 | |
| 83 | #endif |