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      1 /*
      2  * Copyright 2013 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 
      8 #include "SampleCode.h"
      9 
     10 #include "SkCanvas.h"
     11 #include "SkCornerPathEffect.h"
     12 #include "SkDashPathEffect.h"
     13 #include "SkPathUtils.h"
     14 #include "SkRandom.h"
     15 #include "SkView.h"
     16 
     17 typedef void (*BitsToPath)(SkPath*, const char*, int, int, int);
     18 
     19 static const BitsToPath gBitsToPath_fns[] = {
     20     SkPathUtils::BitsToPath_Path,
     21     SkPathUtils::BitsToPath_Region,
     22 };
     23 
     24 // hardcoded bitmap patterns
     25 static const uint8_t gBits[][16] = {
     26     { 0x18, 0x00, 0x3c, 0x00, 0x7e, 0x00, 0xdb, 0x00,
     27       0xff, 0x00, 0x24, 0x00, 0x5a, 0x00, 0xa5, 0x00 },
     28 
     29     { 0x20, 0x80, 0x91, 0x20, 0xbf, 0xa0, 0xee, 0xe0,
     30       0xff, 0xe0, 0x7f, 0xc0, 0x20, 0x80, 0x40, 0x40 },
     31 
     32     { 0x0f, 0x00, 0x7f, 0xe0, 0xff, 0xf0, 0xe6, 0x70,
     33       0xff, 0xf0, 0x19, 0x80, 0x36, 0xc0, 0xc0, 0x30 }
     34 };
     35 
     36 
     37 class SamplePathUtils : public SampleView {
     38 public:
     39     static const int fNumBits = 3;
     40     static const int fH = 8, fW = 12;
     41     static const size_t fRowBytes = 2;
     42     static const int fNumChars = fH * fRowBytes;
     43 
     44     SkPaint fBmpPaint;
     45     SkScalar fPhase;
     46 
     47     SamplePathUtils() {
     48         fBmpPaint.setAntiAlias(true);  // Black paint for bitmap
     49         fBmpPaint.setStyle(SkPaint::kFill_Style);
     50 
     51         fPhase = 0.0f; // to animate the dashed path
     52     }
     53 
     54 protected:
     55     // overrides from SkEventSink
     56     virtual bool onQuery(SkEvent* evt) {
     57         if (SampleCode::TitleQ(*evt)) {
     58             SampleCode::TitleR(evt, "PathUtils");
     59             return true;
     60         }
     61         return this->INHERITED::onQuery(evt);
     62     }
     63 
     64     /////////////////////////////////////////////////////////////
     65 
     66     virtual void onDrawContent(SkCanvas* canvas) {
     67         SkScalar intervals[8] = { .5f, .3f, .5f, .3f, .5f, .3f, .5f, .3f };
     68         SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, fPhase));
     69         SkAutoTUnref<SkCornerPathEffect> corner(SkCornerPathEffect::Create(.25f));
     70         SkAutoTUnref<SkComposePathEffect> compose(SkComposePathEffect::Create(dash, corner));
     71 
     72         SkPaint outlinePaint;
     73         outlinePaint.setAntiAlias(true);  // dashed paint for bitmap
     74         outlinePaint.setStyle(SkPaint::kStroke_Style);
     75         outlinePaint.setPathEffect(compose);
     76 
     77         canvas->scale(10.0f, 10.0f);  // scales up
     78 
     79         for (int i = 0; i < fNumBits; ++i) {
     80             canvas->save();
     81             for (size_t j = 0; j < SK_ARRAY_COUNT(gBitsToPath_fns); ++j) {
     82                 SkPath path;
     83                 gBitsToPath_fns[j](&path, (char*) &gBits[i], fW, fH, fRowBytes);
     84 
     85                 //draw skPath and outline
     86                 canvas->drawPath(path, fBmpPaint);
     87                 canvas->translate(1.5f * fW, 0); // translates past previous bitmap
     88                 canvas->drawPath(path, outlinePaint);
     89                 canvas->translate(1.5f * fW, 0); // translates past previous bitmap
     90             }
     91             canvas->restore();
     92             canvas->translate(0, 1.5f * fH); //translate to next row
     93         }
     94 
     95         // for animated pathEffect
     96         fPhase += .01f;
     97         this->inval(NULL);
     98     }
     99 
    100 private:
    101     typedef SkView INHERITED;
    102 };
    103 
    104 //////////////////////////////////////////////////////////////////////////////
    105 
    106 static SkView* MyFactory() { return new SamplePathUtils; }
    107 static SkViewRegister reg(MyFactory)
    108 ;
    109