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