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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 "SkCanvas.h"
     11 #include "SkGradientShader.h"
     12 #include "SkPath.h"
     13 #include "SkRegion.h"
     14 #include "SkShader.h"
     15 #include "SkUtils.h"
     16 #include "Sk1DPathEffect.h"
     17 #include "SkCornerPathEffect.h"
     18 #include "SkPathMeasure.h"
     19 #include "SkRandom.h"
     20 #include "SkColorPriv.h"
     21 #include "SkColorFilter.h"
     22 #include "SkDither.h"
     23 
     24 // exercise scale/linear/devkern
     25 struct Setting {
     26     bool        fLinearText;
     27     bool        fDevKernText;
     28 };
     29 
     30 static const Setting gSettings[] = {
     31     { false,  false   },
     32     { false,  true    },
     33     { true,   false   },
     34     { true,   true    },
     35 };
     36 
     37 static void doMeasure(SkCanvas* canvas, const SkPaint& paint, const char text[]) {
     38     SkScalar    dy = paint.getFontMetrics(NULL);
     39 
     40     size_t      len = strlen(text);
     41     SkAutoTMalloc<SkScalar> autoWidths(len);
     42     SkScalar*   widths = autoWidths.get();
     43     SkAutoTMalloc<SkRect> autoRects(len);
     44     SkRect*     rects = autoRects.get();
     45     SkRect      bounds;
     46 
     47     SkPaint p(paint);
     48     for (size_t i = 0; i < SK_ARRAY_COUNT(gSettings); i++) {
     49         p.setLinearText(gSettings[i].fLinearText);
     50         p.setDevKernText(gSettings[i].fDevKernText);
     51 
     52         int n = p.getTextWidths(text, len, widths, rects);
     53         SkScalar w = p.measureText(text, len, &bounds);
     54 
     55         p.setStyle(SkPaint::kFill_Style);
     56         p.setColor(0x8888FF88);
     57         canvas->drawRect(bounds, p);
     58         p.setColor(0xFF000000);
     59         canvas->drawText(text, len, 0, 0, p);
     60 
     61         p.setStyle(SkPaint::kStroke_Style);
     62         p.setStrokeWidth(0);
     63         p.setColor(0xFFFF0000);
     64         SkScalar x = 0;
     65         for (int j = 0; j < n; j++) {
     66             SkRect r = rects[j];
     67             r.offset(x, 0);
     68             canvas->drawRect(r, p);
     69             x += widths[j];
     70         }
     71 
     72         p.setColor(0xFF0000FF);
     73         canvas->drawLine(0, 0, w, 0, p);
     74         p.setStrokeWidth(SkIntToScalar(4));
     75         canvas->drawPoint(x, 0, p);
     76 
     77         canvas->translate(0, dy);
     78     }
     79 }
     80 
     81 class MeasureView : public SampleView {
     82 public:
     83     SkPaint fPaint;
     84 
     85     MeasureView() {
     86         fPaint.setAntiAlias(true);
     87         fPaint.setTextSize(SkIntToScalar(64));
     88         this->setBGColor(0xFFDDDDDD);
     89     }
     90 
     91 protected:
     92     // overrides from SkEventSink
     93     virtual bool onQuery(SkEvent* evt) {
     94         if (SampleCode::TitleQ(*evt)) {
     95             SampleCode::TitleR(evt, "Measure");
     96             return true;
     97         }
     98         return this->INHERITED::onQuery(evt);
     99     }
    100 
    101     virtual void onDrawContent(SkCanvas* canvas) {
    102         canvas->translate(fPaint.getTextSize(), fPaint.getTextSize());
    103         doMeasure(canvas, fPaint, "Hamburgefons");
    104     }
    105 
    106 private:
    107     typedef SampleView INHERITED;
    108 };
    109 
    110 //////////////////////////////////////////////////////////////////////////////
    111 
    112 static SkView* MyFactory() { return new MeasureView; }
    113 static SkViewRegister reg(MyFactory);
    114