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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "SampleCode.h"
      9 #include "SkBlurMask.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkCanvas.h"
     12 #include "SkDevice.h"
     13 #include "SkGradientShader.h"
     14 #include "SkGraphics.h"
     15 #include "SkImageDecoder.h"
     16 #include "SkPath.h"
     17 #include "SkRandom.h"
     18 #include "SkRegion.h"
     19 #include "SkShader.h"
     20 #include "SkUtils.h"
     21 #include "SkXfermode.h"
     22 #include "SkColorPriv.h"
     23 #include "SkColorFilter.h"
     24 #include "SkTime.h"
     25 #include "SkTypeface.h"
     26 #include "SkView.h"
     27 
     28 #include "SkOSFile.h"
     29 #include "SkStream.h"
     30 
     31 class TextAlphaView : public SampleView {
     32 public:
     33     TextAlphaView() {
     34         fByte = 0xFF;
     35     }
     36 
     37 protected:
     38     // overrides from SkEventSink
     39     bool onQuery(SkEvent* evt) override {
     40         if (SampleCode::TitleQ(*evt)) {
     41             SampleCode::TitleR(evt, "TextAlpha");
     42             return true;
     43         }
     44         return this->INHERITED::onQuery(evt);
     45     }
     46 
     47     void onDrawContent(SkCanvas* canvas) override {
     48         const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     49         SkPaint paint;
     50         SkScalar    x = SkIntToScalar(10);
     51         SkScalar    y = SkIntToScalar(20);
     52 
     53         paint.setFlags(0x105);
     54 
     55         paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
     56 
     57         paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
     58                                     SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))));
     59         paint.getMaskFilter()->unref();
     60 
     61         SkRandom rand;
     62 
     63         for (int ps = 6; ps <= 35; ps++) {
     64             paint.setColor(rand.nextU() | (0xFF << 24));
     65             paint.setTextSize(SkIntToScalar(ps));
     66             paint.setTextSize(SkIntToScalar(24));
     67             canvas->drawText(str, strlen(str), x, y, paint);
     68             y += paint.getFontMetrics(nullptr);
     69         }
     70     }
     71 
     72     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
     73         return new Click(this);
     74     }
     75 
     76     bool onClick(Click* click) override {
     77         int y = click->fICurr.fY;
     78         if (y < 0) {
     79             y = 0;
     80         } else if (y > 255) {
     81             y = 255;
     82         }
     83         fByte = y;
     84         this->inval(nullptr);
     85         return true;
     86     }
     87 
     88 private:
     89     int fByte;
     90 
     91     typedef SampleView INHERITED;
     92 };
     93 
     94 //////////////////////////////////////////////////////////////////////////////
     95 
     96 static SkView* MyFactory() { return new TextAlphaView; }
     97 static SkViewRegister reg(MyFactory);
     98