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