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      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.finishRecordingAsPicture().release();
     85 }
     86