2013-10-22 11:37:59 +00:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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2014-09-14 22:22:45 +00:00
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* SurfaceCache is a service for caching temporary surfaces and decoded image
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* data in imagelib.
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2013-10-22 11:37:59 +00:00
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*/
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#ifndef MOZILLA_IMAGELIB_SURFACECACHE_H_
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#define MOZILLA_IMAGELIB_SURFACECACHE_H_
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2014-11-26 21:22:11 +00:00
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#include "mozilla/Maybe.h" // for Maybe
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#include "mozilla/MemoryReporting.h" // for MallocSizeOf
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#include "mozilla/HashFunctions.h" // for HashGeneric and AddToHash
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#include "gfx2DGlue.h" // for gfxMemoryLocation
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#include "gfxPoint.h" // for gfxSize
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#include "nsCOMPtr.h" // for already_AddRefed
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#include "mozilla/gfx/Point.h" // for mozilla::gfx::IntSize
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#include "mozilla/gfx/2D.h" // for SourceSurface
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#include "SVGImageContext.h" // for SVGImageContext
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2013-10-22 11:37:59 +00:00
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namespace mozilla {
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namespace image {
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2014-09-14 22:22:45 +00:00
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class DrawableFrameRef;
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class Image;
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class imgFrame;
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2013-10-22 11:37:59 +00:00
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/*
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* ImageKey contains the information we need to look up all cached surfaces for
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* a particular image.
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*/
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typedef Image* ImageKey;
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/*
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* SurfaceKey contains the information we need to look up a specific cached
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* surface. Together with an ImageKey, this uniquely identifies the surface.
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*
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2014-09-19 21:53:28 +00:00
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* Callers should construct a SurfaceKey using the appropriate helper function
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* for their image type - either RasterSurfaceKey or VectorSurfaceKey.
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*/
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class SurfaceKey
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{
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typedef gfx::IntSize IntSize;
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public:
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bool operator==(const SurfaceKey& aOther) const
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{
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return aOther.mSize == mSize &&
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aOther.mSVGContext == mSVGContext &&
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aOther.mAnimationTime == mAnimationTime &&
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aOther.mFlags == mFlags;
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}
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uint32_t Hash() const
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{
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uint32_t hash = HashGeneric(mSize.width, mSize.height);
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hash = AddToHash(hash, mSVGContext.map(HashSIC).valueOr(0));
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hash = AddToHash(hash, mAnimationTime, mFlags);
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return hash;
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}
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IntSize Size() const { return mSize; }
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private:
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SurfaceKey(const IntSize& aSize,
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const Maybe<SVGImageContext>& aSVGContext,
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const float aAnimationTime,
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const uint32_t aFlags)
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: mSize(aSize)
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, mSVGContext(aSVGContext)
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, mAnimationTime(aAnimationTime)
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, mFlags(aFlags)
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{ }
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static uint32_t HashSIC(const SVGImageContext& aSIC) {
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return aSIC.Hash();
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}
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2015-01-07 09:40:23 +00:00
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friend SurfaceKey RasterSurfaceKey(const IntSize&, uint32_t, uint32_t);
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friend SurfaceKey VectorSurfaceKey(const IntSize&,
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const Maybe<SVGImageContext>&,
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float);
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2014-08-22 20:12:38 +00:00
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IntSize mSize;
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Maybe<SVGImageContext> mSVGContext;
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float mAnimationTime;
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uint32_t mFlags;
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};
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inline SurfaceKey
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RasterSurfaceKey(const gfx::IntSize& aSize,
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uint32_t aFlags,
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uint32_t aFrameNum)
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{
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return SurfaceKey(aSize, Nothing(), float(aFrameNum), aFlags);
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}
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inline SurfaceKey
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VectorSurfaceKey(const gfx::IntSize& aSize,
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const Maybe<SVGImageContext>& aSVGContext,
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float aAnimationTime)
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{
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// We don't care about aFlags for VectorImage because none of the flags we
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// have right now influence VectorImage's rendering. If we add a new flag that
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// *does* affect how a VectorImage renders, we'll have to change this.
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return SurfaceKey(aSize, aSVGContext, aAnimationTime, 0);
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}
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2014-11-26 21:22:10 +00:00
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MOZ_BEGIN_ENUM_CLASS(Lifetime, uint8_t)
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Transient,
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Persistent
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MOZ_END_ENUM_CLASS(Lifetime)
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2015-01-12 06:29:35 +00:00
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MOZ_BEGIN_ENUM_CLASS(InsertOutcome, uint8_t)
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SUCCESS, // Success (but see Insert documentation).
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FAILURE, // Couldn't insert (e.g., for capacity reasons).
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FAILURE_ALREADY_PRESENT // A surface with the same key is already present.
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MOZ_END_ENUM_CLASS(InsertOutcome)
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2013-10-22 11:37:59 +00:00
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/**
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* SurfaceCache is an imagelib-global service that allows caching of temporary
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2014-11-26 21:22:10 +00:00
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* surfaces. Surfaces normally expire from the cache automatically if they go
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* too long without being accessed.
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*
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* SurfaceCache does not hold surfaces directly; instead, it holds imgFrame
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* objects, which hold surfaces but also layer on additional features specific
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* to imagelib's needs like animation, padding support, and transparent support
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* for volatile buffers.
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*
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* Sometime it's useful to temporarily prevent surfaces from expiring from the
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* cache. This is most often because losing the data could harm the user
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* experience (for example, we often don't want to allow surfaces that are
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* currently visible to expire) or because it's not possible to rematerialize
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* the surface. SurfaceCache supports this through the use of image locking and
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* surface lifetimes; see the comments for Insert() and LockImage() for more
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* details.
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*
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* Any image which stores surfaces in the SurfaceCache *must* ensure that it
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* calls RemoveImage() before it is destroyed. See the comments for
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* RemoveImage() for more details.
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*
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* SurfaceCache is not thread-safe; it should only be accessed from the main
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* thread.
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*/
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struct SurfaceCache
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{
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typedef gfx::IntSize IntSize;
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2014-11-26 21:22:10 +00:00
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/**
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* Initialize static data. Called during imagelib module initialization.
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*/
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static void Initialize();
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2014-11-26 21:22:10 +00:00
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/**
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* Release static data. Called during imagelib module shutdown.
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*/
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static void Shutdown();
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2014-11-26 21:22:10 +00:00
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/**
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* Look up the imgFrame containing a surface in the cache and returns a
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* drawable reference to that imgFrame.
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*
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* If the imgFrame was found in the cache, but had stored its surface in a
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* volatile buffer which was discarded by the OS, then it is automatically
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2014-11-26 21:22:10 +00:00
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* removed from the cache and an empty DrawableFrameRef is returned. Note that
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* this will never happen to persistent surfaces associated with a locked
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* image; the cache keeps a strong reference to such surfaces internally.
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*
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* @param aImageKey Key data identifying which image the surface belongs to.
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* @param aSurfaceKey Key data which uniquely identifies the requested surface.
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*
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* @return a DrawableFrameRef to the imgFrame wrapping the requested surface,
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* or an empty DrawableFrameRef if not found.
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*/
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static DrawableFrameRef Lookup(const ImageKey aImageKey,
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const SurfaceKey& aSurfaceKey);
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2014-11-26 21:22:10 +00:00
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/**
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* Insert a surface into the cache. If a surface with the same ImageKey and
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* SurfaceKey is already in the cache, Insert returns FAILURE_ALREADY_PRESENT.
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*
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* Each surface in the cache has a lifetime, either Transient or Persistent.
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* Transient surfaces can expire from the cache at any time. Persistent
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* surfaces can ordinarily also expire from the cache at any time, but if the
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* image they're associated with is locked, then these surfaces will never
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* expire. This means that surfaces which cannot be rematerialized should be
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* inserted with a persistent lifetime *after* the image is locked with
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* LockImage(); if you use the other order, the surfaces might expire before
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* LockImage() gets called.
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*
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* If a surface cannot be rematerialized, it may be important to know whether
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* it was inserted into the cache successfully. Insert() returns FAILURE if it
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* failed to insert the surface, which could happen because of capacity
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* reasons, or because it was already freed by the OS. If you aren't inserting
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* a surface with persistent lifetime, or if the surface isn't associated with
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* a locked image, checking for SUCCESS or FAILURE is useless: the surface
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* might expire immediately after being inserted, even though Insert()
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* returned SUCCESS. Thus, many callers do not need to check the result of
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* Insert() at all.
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*
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* @param aTarget The new surface (wrapped in an imgFrame) to insert into
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* the cache.
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* @param aImageKey Key data identifying which image the surface belongs to.
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* @param aSurfaceKey Key data which uniquely identifies the requested surface.
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2014-11-26 21:22:10 +00:00
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* @param aLifetime Whether this is a transient surface that can always be
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* allowed to expire, or a persistent surface that
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* shouldn't expire if the image is locked.
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* @return SUCCESS if the surface was inserted successfully. (But see above
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* for more information about when you should check this.)
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* FAILURE if the surface could not be inserted, e.g. for capacity
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* reasons. (But see above for more information about when you
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* should check this.)
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* FAILURE_ALREADY_PRESENT if a surface with the same ImageKey and
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* SurfaceKey already exists in the cache.
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*/
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static InsertOutcome Insert(imgFrame* aSurface,
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const ImageKey aImageKey,
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const SurfaceKey& aSurfaceKey,
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Lifetime aLifetime);
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2014-11-26 21:22:10 +00:00
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/**
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* Checks if a surface of a given size could possibly be stored in the cache.
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* If CanHold() returns false, Insert() will always fail to insert the
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* surface, but the inverse is not true: Insert() may take more information
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* into account than just image size when deciding whether to cache the
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* surface, so Insert() may still fail even if CanHold() returns true.
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*
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* Use CanHold() to avoid the need to create a temporary surface when we know
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* for sure the cache can't hold it.
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*
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* @param aSize The dimensions of a surface in pixels.
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*
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* @return false if the surface cache can't hold a surface of that size.
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*/
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static bool CanHold(const IntSize& aSize);
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2014-11-26 21:22:10 +00:00
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/**
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* Locks an image, preventing any of that image's surfaces from expiring
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* unless they have a transient lifetime.
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*
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* Regardless of locking, any of an image's surfaces may be removed using
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* RemoveSurface(), and all of an image's surfaces are removed by
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* RemoveImage(), whether the image is locked or not.
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*
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* It's safe to call LockImage() on an image that's already locked; this has
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* no effect.
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*
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* You must always unlock any image you lock. You may do this explicitly by
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* calling UnlockImage(), or implicitly by calling RemoveImage(). Since you're
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* required to call RemoveImage() when you destroy an image, this doesn't
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* impose any additional requirements, but it's preferable to call
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* UnlockImage() earlier if it's possible.
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*
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* @param aImageKey The image to lock.
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*/
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static void LockImage(const ImageKey aImageKey);
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/**
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* Unlocks an image, allowing any of its surfaces to expire at any time.
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*
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* It's OK to call UnlockImage() on an image that's already unlocked; this has
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* no effect.
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*
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* @param aImageKey The image to lock.
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*/
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static void UnlockImage(const ImageKey aImageKey);
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/**
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* Removes a surface from the cache, if it's present. If it's not present,
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* RemoveSurface() has no effect.
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2014-09-19 21:53:28 +00:00
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*
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* Use this function to remove individual surfaces that have become invalid.
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* Prefer RemoveImage() or DiscardAll() when they're applicable, as they have
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* much better performance than calling this function repeatedly.
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2014-09-19 21:53:28 +00:00
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*
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* @param aImageKey Key data identifying which image the surface belongs to.
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* @param aSurfaceKey Key data which uniquely identifies the requested surface.
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*/
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2014-11-26 21:22:10 +00:00
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static void RemoveSurface(const ImageKey aImageKey,
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const SurfaceKey& aSurfaceKey);
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/**
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* Removes all cached surfaces associated with the given image from the cache.
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* If the image is locked, it is automatically unlocked.
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*
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* This MUST be called, at a minimum, when an Image which could be storing
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* surfaces in the surface cache is destroyed. If another image were allocated
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* at the same address it could result in subtle, difficult-to-reproduce bugs.
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*
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* @param aImageKey The image which should be removed from the cache.
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*/
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static void RemoveImage(const ImageKey aImageKey);
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2014-11-26 21:22:10 +00:00
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/**
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* Evicts all evictable surfaces from the cache.
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*
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* All surfaces are evictable except for persistent surfaces associated with
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* locked images. Non-evictable surfaces can only be removed by
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* RemoveSurface() or RemoveImage().
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2014-02-08 19:37:39 +00:00
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*/
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static void DiscardAll();
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|
2014-11-26 21:22:11 +00:00
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|
/**
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* Computes the size of the surfaces stored for the given image at the given
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|
* memory location.
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*
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* This is intended for use with memory reporting.
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*
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* @param aImageKey The image to report memory usage for.
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|
* @param aLocation The location (heap, nonheap, etc.) of the memory to
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|
* report on.
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* @param aMallocSizeOf A fallback malloc memory reporting function. This
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* should be null unless we're reporting on in-process
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|
* heap memory.
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|
*/
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|
|
static size_t SizeOfSurfaces(const ImageKey aImageKey,
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|
|
gfxMemoryLocation aLocation,
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|
|
MallocSizeOf aMallocSizeOf);
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|
2013-10-22 11:37:59 +00:00
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|
private:
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virtual ~SurfaceCache() = 0; // Forbid instantiation.
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|
};
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} // namespace image
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} // namespace mozilla
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#endif // MOZILLA_IMAGELIB_SURFACECACHE_H_
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