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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 "SkColorPriv.h"
     13 #include "SkGradientShader.h"
     14 #include "SkUtils.h"
     15 #include "SkView.h"
     16 
     17 static SkBitmap make_bitmap() {
     18     SkPMColor c[256];
     19     for (int i = 0; i < 256; i++) {
     20         c[i] = SkPackARGB32(255 - i, 0, 0, 0);
     21     }
     22 
     23     SkBitmap bm;
     24     SkColorTable* ctable = new SkColorTable(c, 256);
     25 
     26     bm.allocPixels(SkImageInfo::Make(256, 256, kIndex_8_SkColorType,
     27                                      kPremul_SkAlphaType),
     28                    nullptr, ctable);
     29     ctable->unref();
     30 
     31     bm.lockPixels();
     32     const float cx = bm.width() * 0.5f;
     33     const float cy = bm.height() * 0.5f;
     34     for (int y = 0; y < bm.height(); y++) {
     35         float dy = y - cy;
     36         dy *= dy;
     37         uint8_t* p = bm.getAddr8(0, y);
     38         for (int x = 0; x < 256; x++) {
     39             float dx = x - cx;
     40             dx *= dx;
     41             float d = (dx + dy) / (cx/2);
     42             int id = (int)d;
     43             if (id > 255) {
     44                 id = 255;
     45             }
     46             p[x] = id;
     47         }
     48     }
     49     bm.unlockPixels();
     50     return bm;
     51 }
     52 
     53 class BlurView : public SampleView {
     54     SkBitmap    fBM;
     55 public:
     56     BlurView() {
     57         if (false) { // avoid bit rot, suppress warning
     58             fBM = make_bitmap();
     59         }
     60     }
     61 
     62 protected:
     63     // overrides from SkEventSink
     64     virtual bool onQuery(SkEvent* evt) {
     65         if (SampleCode::TitleQ(*evt)) {
     66             SampleCode::TitleR(evt, "Blur");
     67             return true;
     68         }
     69         return this->INHERITED::onQuery(evt);
     70     }
     71 
     72     void drawBG(SkCanvas* canvas) {
     73         canvas->drawColor(0xFFDDDDDD);
     74     }
     75 
     76     virtual void onDrawContent(SkCanvas* canvas) {
     77         drawBG(canvas);
     78 
     79         SkBlurStyle NONE = SkBlurStyle(-999);
     80         static const struct {
     81             SkBlurStyle fStyle;
     82             int         fCx, fCy;
     83         } gRecs[] = {
     84             { NONE,                                 0,  0 },
     85             { kInner_SkBlurStyle,  -1,  0 },
     86             { kNormal_SkBlurStyle,  0,  1 },
     87             { kSolid_SkBlurStyle,   0, -1 },
     88             { kOuter_SkBlurStyle,   1,  0 },
     89         };
     90 
     91         SkPaint paint;
     92         paint.setAntiAlias(true);
     93         paint.setTextSize(25);
     94         canvas->translate(-40, 0);
     95 
     96         SkBlurMaskFilter::BlurFlags flags = SkBlurMaskFilter::kNone_BlurFlag;
     97         for (int j = 0; j < 2; j++) {
     98             canvas->save();
     99             paint.setColor(SK_ColorBLUE);
    100             for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++) {
    101                 if (gRecs[i].fStyle != NONE) {
    102                     SkMaskFilter* mf = SkBlurMaskFilter::Create(gRecs[i].fStyle,
    103                                       SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(20)),
    104                                       flags);
    105                     paint.setMaskFilter(mf)->unref();
    106                 } else {
    107                     paint.setMaskFilter(nullptr);
    108                 }
    109                 canvas->drawCircle(200 + gRecs[i].fCx*100.f,
    110                                    200 + gRecs[i].fCy*100.f, 50, paint);
    111             }
    112             // draw text
    113             {
    114                 SkMaskFilter* mf = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
    115                                       SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(4)),
    116                                       flags);
    117                 paint.setMaskFilter(mf)->unref();
    118                 SkScalar x = SkIntToScalar(70);
    119                 SkScalar y = SkIntToScalar(400);
    120                 paint.setColor(SK_ColorBLACK);
    121                 canvas->drawText("Hamburgefons Style", 18, x, y, paint);
    122                 canvas->drawText("Hamburgefons Style", 18, x, y + SkIntToScalar(50), paint);
    123                 paint.setMaskFilter(nullptr);
    124                 paint.setColor(SK_ColorWHITE);
    125                 x -= SkIntToScalar(2);
    126                 y -= SkIntToScalar(2);
    127                 canvas->drawText("Hamburgefons Style", 18, x, y, paint);
    128             }
    129             canvas->restore();
    130             flags = SkBlurMaskFilter::kHighQuality_BlurFlag;
    131             canvas->translate(350, 0);
    132         }
    133     }
    134 
    135 private:
    136     typedef SkView INHERITED;
    137 };
    138 
    139 //////////////////////////////////////////////////////////////////////////////
    140 
    141 static SkView* MyFactory() { return new BlurView; }
    142 static SkViewRegister reg(MyFactory);
    143