1 /* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkPdfTokenLooper_DEFINED 9 #define SkPdfTokenLooper_DEFINED 10 11 #include "SkPdfNativeTokenizer.h" 12 // For SkPdfResult 13 #include "SkPdfUtils.h" 14 15 class SkCanvas; 16 class SkPdfContext; 17 18 /** 19 * An object which reads tokens from a tokenizer and draws it to an SkCanvas. 20 * FIXME (scroggo): Can this be an interface? See http://goo.gl/AXQtkH 21 */ 22 class SkPdfTokenLooper { 23 public: 24 /** 25 * Create a looper with no parent. 26 * @param tokenizer SkPdfNativeTokenizer for reading tokens. 27 * @param pdfContext Context for drawing state. 28 * @param canvas Target SkCanvas for drawing. 29 */ 30 SkPdfTokenLooper(SkPdfNativeTokenizer* tokenizer, 31 SkPdfContext* pdfContext, 32 SkCanvas* canvas) 33 : fParent(NULL) 34 , fTokenizer(tokenizer) 35 , fPdfContext(pdfContext) 36 , fCanvas(canvas) {} 37 38 /** 39 * Create a looper as a child of parent. It will share the 40 * SkPdfContext, SkPdfTokenizer, and SkCanvas with its parent. 41 */ 42 explicit SkPdfTokenLooper(SkPdfTokenLooper* parent) 43 : fParent(parent) 44 , fTokenizer(parent->fTokenizer) 45 , fPdfContext(parent->fPdfContext) 46 , fCanvas(parent->fCanvas) {} 47 48 virtual ~SkPdfTokenLooper() {} 49 50 /** 51 * Consume a token, and draw to fCanvas as directed. 52 */ 53 virtual SkPdfResult consumeToken(PdfToken& token) = 0; 54 55 /** 56 * Consume all the tokens this looper can handle. 57 */ 58 virtual void loop() = 0; 59 60 protected: 61 // All are unowned pointers. 62 SkPdfTokenLooper* fParent; 63 SkPdfNativeTokenizer* fTokenizer; 64 SkPdfContext* fPdfContext; 65 SkCanvas* fCanvas; 66 }; 67 68 #endif // SkPdfTokenLooper_DEFINED 69
