The Tor Browser: gfx/skia/trunk/src/lazy/SkDiscardablePixelRef.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2013 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  */

     8 #ifndef SkDiscardablePixelRef_DEFINED

     9 #define SkDiscardablePixelRef_DEFINED

    11 #include "SkDiscardableMemory.h"

    12 #include "SkImageGenerator.h"

    13 #include "SkImageInfo.h"

    14 #include "SkPixelRef.h"

    16 /**

    17  *  A PixelRef backed by SkDiscardableMemory, with the ability to

    18  *  re-generate the pixels (via a SkImageGenerator) if the DM is

    19  *  purged.

    20  *

    21  *  Since SkColorTable is reference-counted, we do not support indexed

    22  *  color with this class; there would be no way for the discardable

    23  *  memory system to unref the color table.

    24  */

    25 class SkDiscardablePixelRef : public SkPixelRef {

    26 public:

    27     SK_DECLARE_INST_COUNT(SkDiscardablePixelRef)

    28     SK_DECLARE_UNFLATTENABLE_OBJECT()

    30 protected:

    31     ~SkDiscardablePixelRef();

    33     virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE;

    34     virtual void onUnlockPixels() SK_OVERRIDE;

    35     virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; }

    37     virtual SkData* onRefEncodedData() SK_OVERRIDE {

    38         return fGenerator->refEncodedData();

    39     }

    41 private:

    42     SkImageGenerator* const fGenerator;

    43     SkDiscardableMemory::Factory* const fDMFactory;

    44     const size_t fRowBytes;

    45     // These const members should not change over the life of the

    46     // PixelRef, since the SkBitmap doesn't expect them to change.

    48     SkDiscardableMemory* fDiscardableMemory;

    50     /* Takes ownership of SkImageGenerator. */

    51     SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*,

    52                           size_t rowBytes,

    53                           SkDiscardableMemory::Factory* factory);

    55     friend bool SkInstallDiscardablePixelRef(SkImageGenerator*,

    56                                              SkBitmap*,

    57                                              SkDiscardableMemory::Factory*);

    59     typedef SkPixelRef INHERITED;

    60 };

    62 #endif  // SkDiscardablePixelRef_DEFINED

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