1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/lazy/SkDiscardablePixelRef.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,62 @@
1.4 +/*
1.5 + * Copyright 2013 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 SkDiscardablePixelRef_DEFINED
1.12 +#define SkDiscardablePixelRef_DEFINED
1.13 +
1.14 +#include "SkDiscardableMemory.h"
1.15 +#include "SkImageGenerator.h"
1.16 +#include "SkImageInfo.h"
1.17 +#include "SkPixelRef.h"
1.18 +
1.19 +/**
1.20 + * A PixelRef backed by SkDiscardableMemory, with the ability to
1.21 + * re-generate the pixels (via a SkImageGenerator) if the DM is
1.22 + * purged.
1.23 + *
1.24 + * Since SkColorTable is reference-counted, we do not support indexed
1.25 + * color with this class; there would be no way for the discardable
1.26 + * memory system to unref the color table.
1.27 + */
1.28 +class SkDiscardablePixelRef : public SkPixelRef {
1.29 +public:
1.30 + SK_DECLARE_INST_COUNT(SkDiscardablePixelRef)
1.31 + SK_DECLARE_UNFLATTENABLE_OBJECT()
1.32 +
1.33 +protected:
1.34 + ~SkDiscardablePixelRef();
1.35 +
1.36 + virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE;
1.37 + virtual void onUnlockPixels() SK_OVERRIDE;
1.38 + virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; }
1.39 +
1.40 + virtual SkData* onRefEncodedData() SK_OVERRIDE {
1.41 + return fGenerator->refEncodedData();
1.42 + }
1.43 +
1.44 +private:
1.45 + SkImageGenerator* const fGenerator;
1.46 + SkDiscardableMemory::Factory* const fDMFactory;
1.47 + const size_t fRowBytes;
1.48 + // These const members should not change over the life of the
1.49 + // PixelRef, since the SkBitmap doesn't expect them to change.
1.50 +
1.51 + SkDiscardableMemory* fDiscardableMemory;
1.52 +
1.53 + /* Takes ownership of SkImageGenerator. */
1.54 + SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*,
1.55 + size_t rowBytes,
1.56 + SkDiscardableMemory::Factory* factory);
1.57 +
1.58 + friend bool SkInstallDiscardablePixelRef(SkImageGenerator*,
1.59 + SkBitmap*,
1.60 + SkDiscardableMemory::Factory*);
1.61 +
1.62 + typedef SkPixelRef INHERITED;
1.63 +};
1.64 +
1.65 +#endif // SkDiscardablePixelRef_DEFINED
