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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 "SkView.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkCanvas.h"
     12 #include "SkGradientShader.h"
     13 #include "SkGraphics.h"
     14 #include "SkImageDecoder.h"
     15 #include "SkPath.h"
     16 #include "SkRandom.h"
     17 #include "SkRegion.h"
     18 #include "SkShader.h"
     19 #include "SkUtils.h"
     20 #include "SkXfermode.h"
     21 #include "SkColorPriv.h"
     22 #include "SkColorFilter.h"
     23 #include "SkTime.h"
     24 #include "SkTypeface.h"
     25 
     26 #include "SkOSFile.h"
     27 #include "SkStream.h"
     28 
     29 static void check_for_nonwhite(const SkBitmap& bm, int alpha) {
     30     if (bm.config() != SkBitmap::kRGB_565_Config) {
     31         return;
     32     }
     33 
     34     for (int y = 0; y < bm.height(); y++) {
     35         for (int x = 0; x < bm.width(); x++) {
     36             uint16_t c = *bm.getAddr16(x, y);
     37             if (c != 0xFFFF) {
     38                 SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
     39                 return;
     40             }
     41         }
     42     }
     43 }
     44 
     45 class TextAlphaView : public SampleView {
     46 public:
     47 	TextAlphaView() {
     48         fByte = 0xFF;
     49     }
     50 
     51 protected:
     52     // overrides from SkEventSink
     53     virtual bool onQuery(SkEvent* evt)  {
     54         if (SampleCode::TitleQ(*evt)) {
     55             SkString str("TextAlpha");
     56             SampleCode::TitleR(evt, str.c_str());
     57             return true;
     58         }
     59         return this->INHERITED::onQuery(evt);
     60     }
     61 
     62     virtual void onDrawContent(SkCanvas* canvas) {
     63         const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     64         SkPaint paint;
     65         SkScalar    x = SkIntToScalar(10);
     66         SkScalar    y = SkIntToScalar(20);
     67 
     68         paint.setFlags(0x105);
     69 
     70         paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
     71 
     72         paint.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(3),
     73                                         SkBlurMaskFilter::kNormal_BlurStyle));
     74         paint.getMaskFilter()->unref();
     75 
     76         SkRandom rand;
     77 
     78         for (int ps = 6; ps <= 35; ps++) {
     79             paint.setColor(rand.nextU() | (0xFF << 24));
     80             paint.setTextSize(SkIntToScalar(ps));
     81             paint.setTextSize(SkIntToScalar(24));
     82             canvas->drawText(str, strlen(str), x, y, paint);
     83             y += paint.getFontMetrics(NULL);
     84         }
     85         //check_for_nonwhite(canvas->getDevice()->accessBitmap(), fByte);
     86         //SkDebugf("------ byte %x\n", fByte);
     87 
     88         if (false) {
     89             fByte += 1;
     90             fByte &= 0xFF;
     91             this->inval(NULL);
     92         }
     93     }
     94 
     95     virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
     96         return new Click(this);
     97     }
     98 
     99     virtual bool onClick(Click* click) {
    100         int y = click->fICurr.fY;
    101         if (y < 0) {
    102             y = 0;
    103         } else if (y > 255) {
    104             y = 255;
    105         }
    106         fByte = y;
    107         this->inval(NULL);
    108         return true;
    109     }
    110 
    111 private:
    112     int fByte;
    113 
    114     typedef SampleView INHERITED;
    115 };
    116 
    117 //////////////////////////////////////////////////////////////////////////////
    118 
    119 static SkView* MyFactory() { return new TextAlphaView; }
    120 static SkViewRegister reg(MyFactory);
    121 
    122