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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 "gm.h"
      9 
     10 #include "Resources.h"
     11 #include "SampleCode.h"
     12 #include "SkBlurMaskFilter.h"
     13 #include "SkCanvas.h"
     14 #include "SkColorPriv.h"
     15 #include "SkImageDecoder.h"
     16 #include "SkPath.h"
     17 #include "SkRandom.h"
     18 #include "SkStream.h"
     19 #include "SkTime.h"
     20 
     21 // Intended to exercise pixel snapping observed with scaled images (and
     22 // with non-scaled images, but for a different reason):  Bug 1145
     23 
     24 class IdentityScaleView : public SampleView {
     25 public:
     26     IdentityScaleView(const char imageFilename[]) {
     27       SkString resourcePath = GetResourcePath(imageFilename);
     28       SkImageDecoder* codec = nullptr;
     29       SkFILEStream stream(resourcePath.c_str());
     30       if (stream.isValid()) {
     31           codec = SkImageDecoder::Factory(&stream);
     32       }
     33       if (codec) {
     34           stream.rewind();
     35           codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
     36           delete codec;
     37       } else {
     38           fBM.allocN32Pixels(1, 1);
     39           *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
     40       }
     41     }
     42 
     43 protected:
     44     SkBitmap fBM;
     45 
     46     // overrides from SkEventSink
     47     bool onQuery(SkEvent* evt) override {
     48         if (SampleCode::TitleQ(*evt)) {
     49             SampleCode::TitleR(evt, "IdentityScale");
     50             return true;
     51         }
     52         return this->INHERITED::onQuery(evt);
     53     }
     54 
     55     void onDrawContent(SkCanvas* canvas) override {
     56 
     57         SkPaint paint;
     58 
     59         paint.setAntiAlias(true);
     60         paint.setTextSize(48);
     61         paint.setFilterQuality(kHigh_SkFilterQuality);
     62 
     63         SkTime::DateTime time;
     64         SkTime::GetDateTime(&time);
     65 
     66         bool use_scale = (time.fSecond % 2 == 1);
     67         const char *text;
     68 
     69         canvas->save();
     70         if (use_scale) {
     71           text = "Scaled = 1";
     72         } else {
     73 
     74           SkRect r = { 100, 100, 356, 356 };
     75           SkPath clipPath;
     76           clipPath.addRoundRect(r, SkIntToScalar(5), SkIntToScalar(5));
     77           canvas->clipPath(clipPath, SkRegion::kIntersect_Op, SkToBool(1));
     78           text = "Scaled = 0";
     79         }
     80         canvas->drawBitmap( fBM, 100, 100, &paint );
     81         canvas->restore();
     82         canvas->drawText( text, strlen(text), 100, 400, paint );
     83         this->inval(nullptr);
     84     }
     85 
     86 private:
     87     typedef SampleView INHERITED;
     88 };
     89 
     90 //////////////////////////////////////////////////////////////////////////////
     91 
     92 static SkView* MyFactory() { return new IdentityScaleView("mandrill_256.png"); }
     93 static SkViewRegister reg(MyFactory);
     94