1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/utils/SkPictureUtils.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,83 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkPictureUtils_DEFINED
1.12 +#define SkPictureUtils_DEFINED
1.13 +
1.14 +#include "SkPicture.h"
1.15 +#include "SkTDArray.h"
1.16 +
1.17 +class SkData;
1.18 +struct SkRect;
1.19 +
1.20 +class SK_API SkPictureUtils {
1.21 +public:
1.22 + /**
1.23 + * Given a rectangular visible "window" into the picture, return an array
1.24 + * of SkPixelRefs that might intersect that area. To keep the call fast,
1.25 + * the returned list is not guaranteed to be exact, so it may miss some,
1.26 + * and it may return false positives.
1.27 + *
1.28 + * The pixelrefs returned in the SkData are already owned by the picture,
1.29 + * so the returned pointers are only valid while the picture is in scope
1.30 + * and remains unchanged.
1.31 + */
1.32 + static SkData* GatherPixelRefs(SkPicture* pict, const SkRect& area);
1.33 +
1.34 + /**
1.35 + * SkPixelRefContainer provides a base class for more elaborate pixel ref
1.36 + * query structures (e.g., rtrees, quad-trees, etc.)
1.37 + */
1.38 + class SkPixelRefContainer : public SkRefCnt {
1.39 + public:
1.40 + virtual void add(SkPixelRef* pr, const SkRect& rect) = 0;
1.41 +
1.42 + // The returned array may contain duplicates
1.43 + virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) = 0;
1.44 +
1.45 + private:
1.46 + typedef SkRefCnt INHERITED;
1.47 + };
1.48 +
1.49 + // Simple query structure that just stores a linked list of pixel refs
1.50 + // and rects.
1.51 + class SkPixelRefsAndRectsList : public SkPixelRefContainer {
1.52 + public:
1.53 + virtual void add(SkPixelRef* pr, const SkRect& rect) SK_OVERRIDE {
1.54 + PixelRefAndRect *dst = fArray.append();
1.55 +
1.56 + dst->fPixelRef = pr;
1.57 + dst->fRect = rect;
1.58 + }
1.59 +
1.60 + virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) SK_OVERRIDE {
1.61 + for (int i = 0; i < fArray.count(); ++i) {
1.62 + if (SkRect::Intersects(fArray[i].fRect, queryRect)) {
1.63 + *result->append() = fArray[i].fPixelRef;
1.64 + }
1.65 + }
1.66 + }
1.67 +
1.68 + private:
1.69 + struct PixelRefAndRect {
1.70 + SkPixelRef* fPixelRef;
1.71 + SkRect fRect;
1.72 + };
1.73 +
1.74 + SkTDArray<PixelRefAndRect> fArray;
1.75 +
1.76 + typedef SkPixelRefContainer INHERITED;
1.77 + };
1.78 +
1.79 + /**
1.80 + * Fill the provided pixel ref container with the picture's pixel ref
1.81 + * and rect information.
1.82 + */
1.83 + static void GatherPixelRefsAndRects(SkPicture* pict, SkPixelRefContainer* prCont);
1.84 +};
1.85 +
1.86 +#endif
