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(nullptr); 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& s, 36 SkRect* dst) const { 37 // src and dst rects may alias and we need to keep the original src, so copy it. 38 const SkRect src = s; 39 40 SkCanvas canvas; 41 SkSmallAllocator<1, 32> allocator; 42 void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize()); 43 44 *dst = src; // catch case where there are no loops 45 SkDrawLooper::Context* context = this->createContext(&canvas, buffer); 46 for (bool firstTime = true;; firstTime = false) { 47 SkPaint p(paint); 48 if (context->next(&canvas, &p)) { 49 SkRect r(src); 50 51 p.setLooper(nullptr); 52 p.computeFastBounds(r, &r); 53 canvas.getTotalMatrix().mapRect(&r); 54 55 if (firstTime) { 56 *dst = r; 57 } else { 58 dst->join(r); 59 } 60 } else { 61 break; 62 } 63 } 64 } 65 66 bool SkDrawLooper::asABlurShadow(BlurShadowRec*) const { 67 return false; 68 } 69
