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      1 
      2 /*
      3  * Copyright 2013 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 
      9 #include "gm.h"
     10 #include "SkBlurMask.h"
     11 #include "SkBlurMaskFilter.h"
     12 
     13 namespace skiagm {
     14 
     15 // This GM exercises the blurred rect nine-patching special cases when the
     16 // blurred rect is very large and/or very far from the origin.
     17 // It creates a large blurred rect/rectori then renders the 4 corners and the
     18 // middle.
     19 class BigBlursGM : public GM {
     20 public:
     21     BigBlursGM() {
     22         this->setBGColor(0xFFDDDDDD);
     23     }
     24 
     25 protected:
     26     SkString onShortName() override {
     27         return SkString("bigblurs");
     28     }
     29 
     30     SkISize onISize() override {
     31         return SkISize::Make(kWidth, kHeight);
     32     }
     33 
     34     void onDraw(SkCanvas* canvas) override {
     35         static const int kBig = 65536;
     36         static const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(4));
     37 
     38         const SkRect bigRect = SkRect::MakeWH(SkIntToScalar(kBig), SkIntToScalar(kBig));
     39         SkRect insetRect = bigRect;
     40         insetRect.inset(20, 20);
     41 
     42         SkPath rectori;
     43 
     44         rectori.addRect(bigRect);
     45         rectori.addRect(insetRect, SkPath::kCCW_Direction);
     46 
     47         // The blur extends 3*kSigma out from the big rect.
     48         // Offset the close-up windows so we get the entire blur
     49         static const SkScalar kLeftTopPad  = 3*kSigma;   // use on left & up of big rect
     50         static const SkScalar kRightBotPad = kCloseUpSize-3*kSigma; // use on right and bot sides
     51 
     52         // UL hand corners of the rendered closeups
     53         const SkPoint origins[] = {
     54             { -kLeftTopPad,          -kLeftTopPad           }, // UL
     55             {  kBig-kRightBotPad,    -kLeftTopPad           }, // UR
     56             {  kBig-kRightBotPad,     kBig-kRightBotPad     }, // LR
     57             { -kLeftTopPad,           kBig-kRightBotPad     }, // LL
     58             {  kBig/2-kCloseUpSize/2, kBig/2-kCloseUpSize/2 }, // center
     59         };
     60 
     61         SkPaint outlinePaint;
     62         outlinePaint.setColor(SK_ColorRED);
     63         outlinePaint.setStyle(SkPaint::kStroke_Style);
     64 
     65         SkPaint blurPaint;
     66         blurPaint.setAntiAlias(true);
     67         blurPaint.setColor(SK_ColorBLACK);
     68 
     69         int desiredX = 0, desiredY = 0;
     70 
     71         for (int i = 0; i < 2; ++i) {
     72             for (int j = 0; j <= kLastEnum_SkBlurStyle; ++j) {
     73                 SkMaskFilter* mf = SkBlurMaskFilter::Create((SkBlurStyle)j, kSigma);
     74                 blurPaint.setMaskFilter(mf)->unref();
     75 
     76                 for (int k = 0; k < (int)SK_ARRAY_COUNT(origins); ++k) {
     77                     canvas->save();
     78 
     79                     SkRect clipRect = SkRect::MakeXYWH(SkIntToScalar(desiredX),
     80                                                        SkIntToScalar(desiredY),
     81                                                        SkIntToScalar(kCloseUpSize),
     82                                                        SkIntToScalar(kCloseUpSize));
     83 
     84                     canvas->clipRect(clipRect, SkRegion::kReplace_Op, false);
     85 
     86                     canvas->translate(desiredX-origins[k].fX,
     87                                       desiredY-origins[k].fY);
     88 
     89                     if (0 == i) {
     90                         canvas->drawRect(bigRect, blurPaint);
     91                     } else {
     92                         canvas->drawPath(rectori, blurPaint);
     93                     }
     94                     canvas->restore();
     95                     canvas->drawRect(clipRect, outlinePaint);
     96 
     97                     desiredX += kCloseUpSize;
     98                 }
     99 
    100                 desiredX = 0;
    101                 desiredY += kCloseUpSize;
    102             }
    103         }
    104     }
    105 
    106 private:
    107     static const int kCloseUpSize = 64;
    108     static const int kWidth = 5 * kCloseUpSize;
    109     static const int kHeight = 2 * (kLastEnum_SkBlurStyle + 1) * kCloseUpSize;
    110 
    111     typedef GM INHERITED;
    112 };
    113 
    114 DEF_GM( return SkNEW(BigBlursGM); )
    115 
    116 }
    117