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 #include "SkAtomics.h" 9 #include "SkCanvas.h" 10 #include "SkDrawable.h" 11 12 static int32_t next_generation_id() { 13 static int32_t gCanvasDrawableGenerationID; 14 15 // do a loop in case our global wraps around, as we never want to 16 // return a 0 17 int32_t genID; 18 do { 19 genID = sk_atomic_inc(&gCanvasDrawableGenerationID) + 1; 20 } while (0 == genID); 21 return genID; 22 } 23 24 SkDrawable::SkDrawable() : fGenerationID(0) {} 25 26 static void draw_bbox(SkCanvas* canvas, const SkRect& r) { 27 SkPaint paint; 28 paint.setStyle(SkPaint::kStroke_Style); 29 paint.setColor(0xFFFF7088); 30 canvas->drawRect(r, paint); 31 canvas->drawLine(r.left(), r.top(), r.right(), r.bottom(), paint); 32 canvas->drawLine(r.left(), r.bottom(), r.right(), r.top(), paint); 33 } 34 35 void SkDrawable::draw(SkCanvas* canvas, const SkMatrix* matrix) { 36 SkAutoCanvasRestore acr(canvas, true); 37 if (matrix) { 38 canvas->concat(*matrix); 39 } 40 this->onDraw(canvas); 41 42 if (false) { 43 draw_bbox(canvas, this->getBounds()); 44 } 45 } 46 47 void SkDrawable::draw(SkCanvas* canvas, SkScalar x, SkScalar y) { 48 SkMatrix matrix = SkMatrix::MakeTrans(x, y); 49 this->draw(canvas, &matrix); 50 } 51 52 SkPicture* SkDrawable::newPictureSnapshot() { 53 return this->onNewPictureSnapshot(); 54 } 55 56 uint32_t SkDrawable::getGenerationID() { 57 if (0 == fGenerationID) { 58 fGenerationID = next_generation_id(); 59 } 60 return fGenerationID; 61 } 62 63 SkRect SkDrawable::getBounds() { 64 return this->onGetBounds(); 65 } 66 67 void SkDrawable::notifyDrawingChanged() { 68 fGenerationID = 0; 69 } 70 71 ///////////////////////////////////////////////////////////////////////////////////////// 72 73 #include "SkPictureRecorder.h" 74 75 SkPicture* SkDrawable::onNewPictureSnapshot() { 76 SkPictureRecorder recorder; 77 78 const SkRect bounds = this->getBounds(); 79 SkCanvas* canvas = recorder.beginRecording(bounds, nullptr, 0); 80 this->draw(canvas); 81 if (false) { 82 draw_bbox(canvas, bounds); 83 } 84 return recorder.endRecording(); 85 } 86
