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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 static void check_for_nonwhite(const SkBitmap& bm, int alpha) {
     32     if (bm.colorType() != kRGB_565_SkColorType) {
     33         return;
     34     }
     35 
     36     for (int y = 0; y < bm.height(); y++) {
     37         for (int x = 0; x < bm.width(); x++) {
     38             uint16_t c = *bm.getAddr16(x, y);
     39             if (c != 0xFFFF) {
     40                 SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
     41                 return;
     42             }
     43         }
     44     }
     45 }
     46 
     47 class TextAlphaView : public SampleView {
     48 public:
     49     TextAlphaView() {
     50         fByte = 0xFF;
     51     }
     52 
     53 protected:
     54     // overrides from SkEventSink
     55     virtual bool onQuery(SkEvent* evt)  {
     56         if (SampleCode::TitleQ(*evt)) {
     57             SampleCode::TitleR(evt, "TextAlpha");
     58             return true;
     59         }
     60         return this->INHERITED::onQuery(evt);
     61     }
     62 
     63     virtual void onDrawContent(SkCanvas* canvas) {
     64         const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     65         SkPaint paint;
     66         SkScalar    x = SkIntToScalar(10);
     67         SkScalar    y = SkIntToScalar(20);
     68 
     69         paint.setFlags(0x105);
     70 
     71         paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
     72 
     73         paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
     74                                     SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))));
     75         paint.getMaskFilter()->unref();
     76 
     77         SkRandom rand;
     78 
     79         for (int ps = 6; ps <= 35; ps++) {
     80             paint.setColor(rand.nextU() | (0xFF << 24));
     81             paint.setTextSize(SkIntToScalar(ps));
     82             paint.setTextSize(SkIntToScalar(24));
     83             canvas->drawText(str, strlen(str), x, y, paint);
     84             y += paint.getFontMetrics(NULL);
     85         }
     86         if (false) { // avoid bit rot, suppress warning
     87             check_for_nonwhite(canvas->getDevice()->accessBitmap(false), fByte);
     88             SkDebugf("------ byte %x\n", fByte);
     89         }
     90 
     91         if (false) {
     92             fByte += 1;
     93             fByte &= 0xFF;
     94             this->inval(NULL);
     95         }
     96     }
     97 
     98     virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) SK_OVERRIDE {
     99         return new Click(this);
    100     }
    101 
    102     virtual bool onClick(Click* click) {
    103         int y = click->fICurr.fY;
    104         if (y < 0) {
    105             y = 0;
    106         } else if (y > 255) {
    107             y = 255;
    108         }
    109         fByte = y;
    110         this->inval(NULL);
    111         return true;
    112     }
    113 
    114 private:
    115     int fByte;
    116 
    117     typedef SampleView INHERITED;
    118 };
    119 
    120 //////////////////////////////////////////////////////////////////////////////
    121 
    122 static SkView* MyFactory() { return new TextAlphaView; }
    123 static SkViewRegister reg(MyFactory);
    124