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