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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPdfTokenLooper_DEFINED
#define SkPdfTokenLooper_DEFINED
#include "SkPdfNativeTokenizer.h"
// For SkPdfResult
#include "SkPdfUtils.h"
class SkCanvas;
class SkPdfContext;
/**
* An object which reads tokens from a tokenizer and draws it to an SkCanvas.
* FIXME (scroggo): Can this be an interface? See http://goo.gl/AXQtkH
*/
class SkPdfTokenLooper {
public:
/**
* Create a looper with no parent.
* @param tokenizer SkPdfNativeTokenizer for reading tokens.
* @param pdfContext Context for drawing state.
* @param canvas Target SkCanvas for drawing.
*/
SkPdfTokenLooper(SkPdfNativeTokenizer* tokenizer,
SkPdfContext* pdfContext,
SkCanvas* canvas)
: fParent(NULL)
, fTokenizer(tokenizer)
, fPdfContext(pdfContext)
, fCanvas(canvas) {}
/**
* Create a looper as a child of parent. It will share the
* SkPdfContext, SkPdfTokenizer, and SkCanvas with its parent.
*/
explicit SkPdfTokenLooper(SkPdfTokenLooper* parent)
: fParent(parent)
, fTokenizer(parent->fTokenizer)
, fPdfContext(parent->fPdfContext)
, fCanvas(parent->fCanvas) {}
virtual ~SkPdfTokenLooper() {}
/**
* Consume a token, and draw to fCanvas as directed.
*/
virtual SkPdfResult consumeToken(PdfToken& token) = 0;
/**
* Consume all the tokens this looper can handle.
*/
virtual void loop() = 0;
protected:
// All are unowned pointers.
SkPdfTokenLooper* fParent;
SkPdfNativeTokenizer* fTokenizer;
SkPdfContext* fPdfContext;
SkCanvas* fCanvas;
};
#endif // SkPdfTokenLooper_DEFINED
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