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 #include "SkDrawLooper.h" 9 #include "SkCanvas.h" 10 #include "SkMatrix.h" 11 #include "SkPaint.h" 12 #include "SkRect.h" 13 #include "SkSmallAllocator.h" 14 15 bool SkDrawLooper::canComputeFastBounds(const SkPaint& paint) const { 16 SkCanvas canvas; 17 SkSmallAllocator<1, 32> allocator; 18 void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize()); 19 20 SkDrawLooper::Context* context = this->createContext(&canvas, buffer); 21 for (;;) { 22 SkPaint p(paint); 23 if (context->next(&canvas, &p)) { 24 p.setLooper(NULL); 25 if (!p.canComputeFastBounds()) { 26 return false; 27 } 28 } else { 29 break; 30 } 31 } 32 return true; 33 } 34 35 void SkDrawLooper::computeFastBounds(const SkPaint& paint, const SkRect& src, 36 SkRect* dst) const { 37 SkCanvas canvas; 38 SkSmallAllocator<1, 32> allocator; 39 void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize()); 40 41 *dst = src; // catch case where there are no loops 42 SkDrawLooper::Context* context = this->createContext(&canvas, buffer); 43 for (bool firstTime = true;; firstTime = false) { 44 SkPaint p(paint); 45 if (context->next(&canvas, &p)) { 46 SkRect r(src); 47 48 p.setLooper(NULL); 49 p.computeFastBounds(r, &r); 50 canvas.getTotalMatrix().mapRect(&r); 51 52 if (firstTime) { 53 *dst = r; 54 } else { 55 dst->join(r); 56 } 57 } else { 58 break; 59 } 60 } 61 } 62 63 bool SkDrawLooper::asABlurShadow(BlurShadowRec*) const { 64 return false; 65 } 66
