2bd8b81005
objective -- move clients over to SkImage tasks - use SkImageInfo instead of SkBitmap::Config - add support for colortables to SkImage - add drawImage to SkCanvas - return SkImage from readPixels This CL works towards the first task R=robertphillips@google.com Review URL: https://codereview.chromium.org/54363008 git-svn-id: http://skia.googlecode.com/svn/trunk@12077 2bbb7eff-a529-9590-31e7-b0007b416f81
100 lines
2.7 KiB
C++
100 lines
2.7 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 SkBitmapFactory_DEFINED
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#define SkBitmapFactory_DEFINED
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#include "SkImage.h"
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#include "SkTypes.h"
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class SkBitmap;
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class SkData;
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class SkImageCache;
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/**
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* Factory for creating a bitmap from encoded data.
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*/
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class SkBitmapFactory {
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public:
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/**
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* Struct containing information about a pixel destination.
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*/
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struct Target {
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/**
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* Pre-allocated memory.
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*/
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void* fAddr;
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/**
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* Rowbytes of the allocated memory.
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*/
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size_t fRowBytes;
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};
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/**
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* Signature for a function to decode an image from encoded data.
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*/
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typedef bool (*DecodeProc)(const void* data, size_t length, SkImageInfo*, const Target*);
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/**
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* Create a bitmap factory which uses DecodeProc for decoding.
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* @param DecodeProc Must not be NULL.
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*/
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SkBitmapFactory(DecodeProc);
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~SkBitmapFactory();
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/**
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* Set an image cache to use on pixelrefs provided by installPixelRef. Mutually exclusive
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* with fCacheSelector.
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*/
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void setImageCache(SkImageCache* cache);
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/**
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* Sets up an SkBitmap from encoded data. On success, the SkBitmap will have its Config,
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* width, height, rowBytes and pixelref set. If fImageCache is non-NULL, or if fCacheSelector
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* is set and returns non-NULL, the pixelref will lazily decode, and that SkImageCache will
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* handle the pixel memory. Otherwise installPixelRef will do an immediate decode.
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* @param SkData Encoded data.
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* @param SkBitmap to install the pixel ref on.
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* @return bool Whether or not a pixel ref was successfully installed.
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*/
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bool installPixelRef(SkData*, SkBitmap*);
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/**
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* An object for selecting an SkImageCache to use based on an SkImageInfo.
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*/
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class CacheSelector : public SkRefCnt {
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public:
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SK_DECLARE_INST_COUNT(CacheSelector)
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/**
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* Return an SkImageCache to use based on the provided SkImageInfo. If the caller decides
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* to hang on to the result, it will call ref, so the implementation should not add a ref
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* as a result of this call.
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*/
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virtual SkImageCache* selectCache(const SkImageInfo&) = 0;
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private:
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typedef SkRefCnt INHERITED;
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};
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/**
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* Set the function to be used to select which SkImageCache to use. Mutually exclusive with
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* fImageCache.
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*/
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void setCacheSelector(CacheSelector*);
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private:
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DecodeProc fDecodeProc;
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SkImageCache* fImageCache;
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CacheSelector* fCacheSelector;
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};
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#endif // SkBitmapFactory_DEFINED
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