1 /* 2 * Copyright 2014 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 SkRecordDraw_DEFINED 9 #define SkRecordDraw_DEFINED 10 11 #include "SkRecord.h" 12 #include "SkCanvas.h" 13 14 // Draw an SkRecord into an SkCanvas. A convenience wrapper around SkRecords::Draw. 15 void SkRecordDraw(const SkRecord&, SkCanvas*); 16 17 namespace SkRecords { 18 19 // This is an SkRecord visitor that will draw that SkRecord to an SkCanvas. 20 class Draw : SkNoncopyable { 21 public: Draw(SkCanvas * canvas)22 explicit Draw(SkCanvas* canvas) 23 : fInitialCTM(canvas->getTotalMatrix()), fCanvas(canvas), fIndex(0) {} 24 index()25 unsigned index() const { return fIndex; } next()26 void next() { ++fIndex; } 27 operator()28 template <typename T> void operator()(const T& r) { 29 if (!this->skip(r)) { 30 this->draw(r); 31 } 32 } 33 34 private: 35 // No base case, so we'll be compile-time checked that we implement all possibilities. 36 template <typename T> void draw(const T&); 37 38 // skip() should return true if we can skip this command, false if not. 39 // It may update fIndex directly to skip more than just this one command. 40 41 // Mostly we just blindly call fCanvas and let it handle quick rejects itself. skip(const T &)42 template <typename T> bool skip(const T&) { return false; } 43 44 // We add our own quick rejects for commands added by optimizations. 45 bool skip(const PairedPushCull&); 46 bool skip(const BoundedDrawPosTextH&); 47 48 const SkMatrix fInitialCTM; 49 SkCanvas* fCanvas; 50 unsigned fIndex; 51 }; 52 53 } // namespace SkRecords 54 55 #endif//SkRecordDraw_DEFINED 56