acd471f47c
git-svn-id: http://skia.googlecode.com/svn/trunk@1231 2bbb7eff-a529-9590-31e7-b0007b416f81
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef SkGPipe_DEFINED
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#define SkGPipe_DEFINED
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#include "SkWriter32.h"
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class SkCanvas;
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class SkGPipeReader {
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public:
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SkGPipeReader(SkCanvas* target);
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~SkGPipeReader();
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enum Status {
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kDone_Status, //!< no more data expected from reader
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kEOF_Status, //!< need more data from reader
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kError_Status //!< encountered error
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};
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// data must be 4-byte aligned
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// length must be a multiple of 4
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Status playback(const void* data, size_t length);
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private:
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SkCanvas* fCanvas;
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class SkGPipeState* fState;
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};
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///////////////////////////////////////////////////////////////////////////////
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class SkGPipeController {
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public:
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/**
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* Called periodically by the writer, to get a working buffer of RAM to
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* write into. The actual size of the block is also returned, and must be
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* actual >= minRequest. If NULL is returned, then actual is ignored and
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* writing will stop.
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*
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* The returned block must be 4-byte aligned, and actual must be a
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* multiple of 4.
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* minRequest will always be a multiple of 4.
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*/
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virtual void* requestBlock(size_t minRequest, size_t* actual) = 0;
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/**
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* This is called each time some atomic portion of the data has been
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* written to the block (most recently returned by requestBlock()).
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* If bytes == 0, then the writer has finished.
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*
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* bytes will always be a multiple of 4.
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*/
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virtual void notifyWritten(size_t bytes) = 0;
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};
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class SkGPipeWriter {
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public:
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SkGPipeWriter();
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~SkGPipeWriter();
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bool isRecording() const { return NULL != fCanvas; }
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SkCanvas* startRecording(SkGPipeController*);
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// called in destructor, but can be called sooner once you know there
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// should be no more drawing calls made into the recording canvas.
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void endRecording();
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private:
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class SkGPipeCanvas* fCanvas;
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SkGPipeController* fController;
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SkWriter32 fWriter;
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};
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#endif
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