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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkRecordDraw_DEFINED | 8 #ifndef SkRecordDraw_DEFINED |
9 #define SkRecordDraw_DEFINED | 9 #define SkRecordDraw_DEFINED |
10 | 10 |
11 #include "SkRecord.h" | 11 #include "SkRecord.h" |
12 #include "SkCanvas.h" | 12 #include "SkCanvas.h" |
13 | 13 |
14 // Draw an SkRecord into an SkCanvas. | 14 // Draw an SkRecord into an SkCanvas. A convenience wrapper around SkRecords::D
raw. |
15 void SkRecordDraw(const SkRecord&, SkCanvas*); | 15 void SkRecordDraw(const SkRecord&, SkCanvas*); |
16 | 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: |
| 22 explicit Draw(SkCanvas* canvas) : fCanvas(canvas), fIndex(0) {} |
| 23 |
| 24 unsigned index() const { return fIndex; } |
| 25 void next() { ++fIndex; } |
| 26 |
| 27 template <typename T> void operator()(const T& r) { |
| 28 if (!this->skip(r)) { |
| 29 this->draw(r); |
| 30 } |
| 31 } |
| 32 |
| 33 private: |
| 34 // No base case, so we'll be compile-time checked that we implement all poss
ibilities. |
| 35 template <typename T> void draw(const T&); |
| 36 |
| 37 // skip() should return true if we can skip this command, false if not. |
| 38 // It may update fIndex directly to skip more than just this one command. |
| 39 |
| 40 // Mostly we just blindly call fCanvas and let it handle quick rejects itsel
f. |
| 41 template <typename T> bool skip(const T&) { return false; } |
| 42 |
| 43 // We add our own quick rejects for commands added by optimizations. |
| 44 bool skip(const PairedPushCull&); |
| 45 bool skip(const BoundedDrawPosTextH&); |
| 46 |
| 47 SkCanvas* fCanvas; |
| 48 unsigned fIndex; |
| 49 }; |
| 50 |
| 51 } // namespace SkRecords |
| 52 |
17 #endif//SkRecordDraw_DEFINED | 53 #endif//SkRecordDraw_DEFINED |
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