dd59799cf8
I also specifically mentioned in the SkImageGenerator documentation that it should always return the same information on subsequent calls to getInfo() and getPixels(). Motivation: When a bitmap is recorded into a SkPicture, it will choose whether to shallow- or deep-copy itself into the SkBitmapHeap based on the immutable flag. Failing to set it would make picture recording slow. BUG= R=fmalita@google.com, reed@google.com, scroggo@google.com Author: halcanary@google.com Review URL: https://codereview.chromium.org/99303003 git-svn-id: http://skia.googlecode.com/svn/trunk@12445 2bbb7eff-a529-9590-31e7-b0007b416f81
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/*
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* Copyright 2013 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 SkImageGenerator_DEFINED
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#define SkImageGenerator_DEFINED
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#include "SkImageInfo.h"
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class SkData;
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/**
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* An interface that allows a purgeable PixelRef (such as a
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* SkDiscardablePixelRef) to decode and re-decode an image as needed.
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*/
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class SkImageGenerator {
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public:
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/**
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* The PixelRef which takes ownership of this SkImageGenerator
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* will call the image generator's destructor.
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*/
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virtual ~SkImageGenerator() { }
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/**
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* Return a ref to the encoded (i.e. compressed) representation,
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* of this data.
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*
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* If non-NULL is returned, the caller is responsible for calling
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* unref() on the data when it is finished.
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*/
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virtual SkData* refEncodedData() { return NULL; }
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/**
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* Return some information about the image, allowing the owner of
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* this object to allocate pixels.
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*
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* Repeated calls to this function should give the same results,
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* allowing the PixelRef to be immutable.
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*
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* @return false if anything goes wrong.
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*/
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virtual bool getInfo(SkImageInfo* info) = 0;
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/**
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* Decode into the given pixels, a block of memory of size at
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* least (info.fHeight - 1) * rowBytes + (info.fWidth *
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* bytesPerPixel)
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*
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* Repeated calls to this function should give the same results,
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* allowing the PixelRef to be immutable.
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*
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* @param info A description of the format (config, size)
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* expected by the caller. This can simply be identical
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* to the info returned by getInfo().
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*
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* This contract also allows the caller to specify
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* different output-configs, which the implementation can
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* decide to support or not.
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*
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* @return false if anything goes wrong or if the image info is
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* unsupported.
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*/
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virtual bool getPixels(const SkImageInfo& info,
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void* pixels,
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size_t rowBytes) = 0;
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};
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#endif // SkImageGenerator_DEFINED
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