1 /* 2 * Copyright 2015 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 SkMiniRecorder_DEFINED 9 #define SkMiniRecorder_DEFINED 10 11 #include "include/core/SkScalar.h" 12 #include "include/core/SkTypes.h" 13 #include "include/private/SkNoncopyable.h" 14 #include "src/core/SkRecords.h" 15 class SkCanvas; 16 17 // Records small pictures, but only a limited subset of the canvas API, and may fail. 18 class SkMiniRecorder : SkNoncopyable { 19 public: 20 SkMiniRecorder(); 21 ~SkMiniRecorder(); 22 23 // Try to record an op. Returns false on failure. 24 bool drawPath(const SkPath&, const SkPaint&); 25 bool drawRect(const SkRect&, const SkPaint&); 26 bool drawTextBlob(const SkTextBlob*, SkScalar x, SkScalar y, const SkPaint&); 27 28 // Detach anything we've recorded as a picture, resetting this SkMiniRecorder. 29 // If cull is nullptr we'll calculate it. 30 sk_sp<SkPicture> detachAsPicture(const SkRect* cull); 31 32 // Flush anything we've recorded to the canvas, resetting this SkMiniRecorder. 33 // This is logically the same as but rather more efficient than: 34 // sk_sp<SkPicture> pic(this->detachAsPicture(nullptr)); 35 // pic->playback(canvas); 36 void flushAndReset(SkCanvas*); 37 38 private: 39 enum class State { 40 kEmpty, 41 kDrawPath, 42 kDrawRect, 43 kDrawTextBlob, 44 }; 45 46 State fState; 47 48 template <size_t A, size_t B> 49 struct Max { static const size_t val = A > B ? A : B; }; 50 51 static const size_t kInlineStorage = 52 Max<sizeof(SkRecords::DrawPath), 53 Max<sizeof(SkRecords::DrawRect), 54 sizeof(SkRecords::DrawTextBlob)>::val>::val; 55 alignas(void*) alignas(double) char fBuffer[kInlineStorage]; 56 }; 57 58 #endif//SkMiniRecorder_DEFINED 59