36026de644
Instead of passing a pointer to a pointer to a NULL looper, which can then be set to point to a new looper (which then must be looped and deleted), pass a pointer to the current looper. Each function can then create a looper based on the parent (on the stack) and call loop() itself. Remove setUp(). Now that there is a pointer to the parent at creation time, there is no need for this function. Modify the constructors to only provide ones that are needed. Add documentation. Remove PdfInlineImageLooper::done(), which is never used. R=mtklein@google.com Review URL: https://codereview.chromium.org/83183004 git-svn-id: http://skia.googlecode.com/svn/trunk@12447 2bbb7eff-a529-9590-31e7-b0007b416f81
69 lines
1.8 KiB
C++
69 lines
1.8 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 SkPdfTokenLooper_DEFINED
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#define SkPdfTokenLooper_DEFINED
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#include "SkPdfNativeTokenizer.h"
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// For SkPdfResult
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#include "SkPdfUtils.h"
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class SkCanvas;
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class SkPdfContext;
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/**
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* An object which reads tokens from a tokenizer and draws it to an SkCanvas.
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* FIXME (scroggo): Can this be an interface? See http://goo.gl/AXQtkH
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*/
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class SkPdfTokenLooper {
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public:
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/**
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* Create a looper with no parent.
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* @param tokenizer SkPdfNativeTokenizer for reading tokens.
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* @param pdfContext Context for drawing state.
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* @param canvas Target SkCanvas for drawing.
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*/
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SkPdfTokenLooper(SkPdfNativeTokenizer* tokenizer,
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SkPdfContext* pdfContext,
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SkCanvas* canvas)
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: fParent(NULL)
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, fTokenizer(tokenizer)
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, fPdfContext(pdfContext)
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, fCanvas(canvas) {}
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/**
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* Create a looper as a child of parent. It will share the
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* SkPdfContext, SkPdfTokenizer, and SkCanvas with its parent.
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*/
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explicit SkPdfTokenLooper(SkPdfTokenLooper* parent)
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: fParent(parent)
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, fTokenizer(parent->fTokenizer)
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, fPdfContext(parent->fPdfContext)
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, fCanvas(parent->fCanvas) {}
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virtual ~SkPdfTokenLooper() {}
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/**
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* Consume a token, and draw to fCanvas as directed.
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*/
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virtual SkPdfResult consumeToken(PdfToken& token) = 0;
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/**
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* Consume all the tokens this looper can handle.
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*/
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virtual void loop() = 0;
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protected:
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// All are unowned pointers.
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SkPdfTokenLooper* fParent;
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SkPdfNativeTokenizer* fTokenizer;
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SkPdfContext* fPdfContext;
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SkCanvas* fCanvas;
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};
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#endif // SkPdfTokenLooper_DEFINED
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