158fcaa031
BUG=chromium:230419 R=mtklein@google.com,reed@google.com Review URL: https://codereview.chromium.org/490253003
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPictureUtils_DEFINED
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#define SkPictureUtils_DEFINED
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#include "SkPicture.h"
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#include "SkTDArray.h"
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class SkData;
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struct SkRect;
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class SK_API SkPictureUtils {
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public:
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/**
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* Given a rectangular visible "window" into the picture, return an array
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* of SkPixelRefs that might intersect that area. To keep the call fast,
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* the returned list is not guaranteed to be exact, so it may miss some,
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* and it may return false positives.
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*
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* The pixelrefs returned in the SkData are already owned by the picture,
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* so the returned pointers are only valid while the picture is in scope
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* and remains unchanged.
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*/
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static SkData* GatherPixelRefs(const SkPicture* pict, const SkRect& area);
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/**
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* SkPixelRefContainer provides a base class for more elaborate pixel ref
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* query structures (e.g., rtrees, quad-trees, etc.)
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*/
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class SkPixelRefContainer : public SkRefCnt {
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public:
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virtual void add(SkPixelRef* pr, const SkRect& rect) = 0;
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// The returned array may contain duplicates
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virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) = 0;
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private:
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typedef SkRefCnt INHERITED;
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};
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// Simple query structure that just stores a linked list of pixel refs
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// and rects.
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class SkPixelRefsAndRectsList : public SkPixelRefContainer {
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public:
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virtual void add(SkPixelRef* pr, const SkRect& rect) SK_OVERRIDE {
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PixelRefAndRect *dst = fArray.append();
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dst->fPixelRef = pr;
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dst->fRect = rect;
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}
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virtual void query(const SkRect& queryRect, SkTDArray<SkPixelRef*> *result) SK_OVERRIDE {
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for (int i = 0; i < fArray.count(); ++i) {
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if (SkRect::Intersects(fArray[i].fRect, queryRect)) {
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*result->append() = fArray[i].fPixelRef;
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}
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}
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}
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private:
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struct PixelRefAndRect {
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SkPixelRef* fPixelRef;
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SkRect fRect;
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};
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SkTDArray<PixelRefAndRect> fArray;
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typedef SkPixelRefContainer INHERITED;
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};
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/**
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* Fill the provided pixel ref container with the picture's pixel ref
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* and rect information.
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*/
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static void GatherPixelRefsAndRects(SkPicture* pict, SkPixelRefContainer* prCont);
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/**
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* How many bytes are allocated to hold the SkPicture.
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* Includes operations, parameters, bounding data, deletion listeners;
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* includes nested SkPictures, but does not include large objects that
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* SkRecord holds a reference to (e.g. paths, or pixels backing bitmaps).
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*/
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static size_t ApproximateBytesUsed(const SkPicture* pict);
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};
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#endif
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