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      1 
      2 
      3 /*
      4  * Copyright 2012 Google Inc.
      5  *
      6  * Use of this source code is governed by a BSD-style license that can be
      7  * found in the LICENSE file.
      8  */
      9 
     10 #include "gm.h"
     11 #include "SkCanvas.h"
     12 #include "SkPicture.h"
     13 
     14 namespace skiagm {
     15 
     16 class DistantClipGM : public GM {
     17 public:
     18     DistantClipGM() { }
     19 
     20 protected:
     21 
     22     SkString onShortName() {
     23         return SkString("distantclip");
     24     }
     25 
     26     SkISize onISize() { return make_isize(100, 100); }
     27 
     28     virtual void onDraw(SkCanvas* canvas) {
     29         int offset = 35000;
     30         int extents = 1000;
     31 
     32         // We record a picture of huge vertical extents in which we clear the canvas to red, create
     33         // a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
     34         // green into that.
     35         SkPicture pict;
     36         SkCanvas* rec = pict.beginRecording(100, offset + extents);
     37         rec->drawColor(0xffff0000);
     38         rec->save();
     39         SkRect r = {
     40             SkIntToScalar(-extents),
     41             SkIntToScalar(offset - extents),
     42             SkIntToScalar(extents),
     43             SkIntToScalar(offset + extents)
     44         };
     45         SkPath p;
     46         p.addRoundRect(r, 5, 5);
     47         rec->clipPath(p, SkRegion::kIntersect_Op, true);
     48         rec->drawColor(0xff00ff00);
     49         rec->restore();
     50         pict.endRecording();
     51 
     52         // Next we play that picture into another picture of the same size.
     53         SkPicture pict2;
     54         pict.draw(pict2.beginRecording(100, offset + extents));
     55         pict2.endRecording();
     56 
     57         // Finally we play the part of that second picture that should be green into the canvas.
     58         canvas->save();
     59         canvas->translate(SkIntToScalar(extents / 2),
     60                           SkIntToScalar(-(offset - extents / 2)));
     61         pict2.draw(canvas);
     62         canvas->restore();
     63 
     64         // If the image is red, we erroneously decided the clipPath was empty and didn't record
     65         // the green drawColor, if it's green we're all good.
     66     }
     67 
     68 private:
     69     typedef GM INHERITED;
     70 };
     71 
     72 ///////////////////////////////////////////////////////////////////////////////
     73 
     74 static GM* MyFactory(void*) { return new DistantClipGM; }
     75 static GMRegistry reg(MyFactory);
     76 
     77 }
     78