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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 "DecodeFile.h"
      9 #include "gm.h"
     10 
     11 #include "Resources.h"
     12 #include "SampleCode.h"
     13 #include "SkBlurMaskFilter.h"
     14 #include "SkCanvas.h"
     15 #include "SkColorPriv.h"
     16 #include "SkPath.h"
     17 #include "SkRandom.h"
     18 #include "SkStream.h"
     19 #include "SkTime.h"
     20 #include "SkClipOpPriv.h"
     21 
     22 // Intended to exercise pixel snapping observed with scaled images (and
     23 // with non-scaled images, but for a different reason):  Bug 1145
     24 
     25 class IdentityScaleView : public SampleView {
     26 public:
     27     IdentityScaleView(const char imageFilename[]) {
     28       SkString resourcePath = GetResourcePath(imageFilename);
     29       if (!decode_file(resourcePath.c_str(), &fBM)) {
     30           fBM.allocN32Pixels(1, 1);
     31           *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
     32       }
     33     }
     34 
     35 protected:
     36     SkBitmap fBM;
     37 
     38     // overrides from SkEventSink
     39     bool onQuery(SkEvent* evt) override {
     40         if (SampleCode::TitleQ(*evt)) {
     41             SampleCode::TitleR(evt, "IdentityScale");
     42             return true;
     43         }
     44         return this->INHERITED::onQuery(evt);
     45     }
     46 
     47     void onDrawContent(SkCanvas* canvas) override {
     48 
     49         SkPaint paint;
     50 
     51         paint.setAntiAlias(true);
     52         paint.setTextSize(48);
     53         paint.setFilterQuality(kHigh_SkFilterQuality);
     54 
     55         SkTime::DateTime time;
     56         SkTime::GetDateTime(&time);
     57 
     58         bool use_scale = (time.fSecond % 2 == 1);
     59         const char *text;
     60 
     61         canvas->save();
     62         if (use_scale) {
     63           text = "Scaled = 1";
     64         } else {
     65 
     66           SkRect r = { 100, 100, 356, 356 };
     67           SkPath clipPath;
     68           clipPath.addRoundRect(r, SkIntToScalar(5), SkIntToScalar(5));
     69           canvas->clipPath(clipPath, kIntersect_SkClipOp, true);
     70           text = "Scaled = 0";
     71         }
     72         canvas->drawBitmap( fBM, 100, 100, &paint );
     73         canvas->restore();
     74         canvas->drawString(text, 100, 400, paint );
     75         this->inval(nullptr);
     76     }
     77 
     78 private:
     79     typedef SampleView INHERITED;
     80 };
     81 
     82 //////////////////////////////////////////////////////////////////////////////
     83 
     84 static SkView* MyFactory() { return new IdentityScaleView("mandrill_256.png"); }
     85 static SkViewRegister reg(MyFactory);
     86