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      1 /*
      2  * Copyright 2014 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 "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkGradientShader.h"
     11 #include "SkPath.h"
     12 #include "SkRandom.h"
     13 
     14 int make_bm(SkBitmap* bm, int height) {
     15     constexpr int kRadius = 22;
     16     constexpr int kMargin = 8;
     17     constexpr SkScalar kStartAngle = 0;
     18     constexpr SkScalar kDAngle = 25;
     19     constexpr SkScalar kSweep = 320;
     20     constexpr SkScalar kThickness = 8;
     21 
     22     int count = (height / (2 * kRadius + kMargin));
     23     height = count * (2 * kRadius + kMargin);
     24 
     25     bm->allocN32Pixels(2 * (kRadius + kMargin), height);
     26     SkRandom random;
     27 
     28     SkCanvas wholeCanvas(*bm);
     29     wholeCanvas.clear(0x00000000);
     30 
     31     SkScalar angle = kStartAngle;
     32     for (int i = 0; i < count; ++i) {
     33         SkPaint paint;
     34         // The sw rasterizer disables AA for large canvii. So we make a small canvas for each draw.
     35         SkBitmap smallBM;
     36         SkIRect subRect = SkIRect::MakeXYWH(0, i * (kMargin + 2 * kRadius),
     37                                             2 * kRadius + kMargin, 2 * kRadius + kMargin);
     38         bm->extractSubset(&smallBM, subRect);
     39         SkCanvas canvas(smallBM);
     40         canvas.translate(kMargin + kRadius, kMargin + kRadius);
     41 
     42         paint.setAntiAlias(true);
     43         paint.setColor(random.nextU() | 0xFF000000);
     44         paint.setStyle(SkPaint::kStroke_Style);
     45         paint.setStrokeWidth(kThickness);
     46         paint.setStrokeCap(SkPaint::kRound_Cap);
     47         SkScalar radius = kRadius - kThickness / 2;
     48         SkRect bounds = SkRect::MakeLTRB(-radius, -radius, radius, radius);
     49 
     50         canvas.drawArc(bounds, angle, kSweep, false, paint);
     51         angle += kDAngle;
     52     }
     53     bm->setImmutable();
     54     return count;
     55 }
     56 
     57 class TallStretchedBitmapsGM : public skiagm::GM {
     58 public:
     59     TallStretchedBitmapsGM() {}
     60 
     61 protected:
     62     SkString onShortName() override {
     63         return SkString("tall_stretched_bitmaps");
     64     }
     65 
     66     SkISize onISize() override {
     67         return SkISize::Make(730, 690);
     68     }
     69 
     70     void onOnceBeforeDraw() override {
     71         for (size_t i = 0; i < SK_ARRAY_COUNT(fTallBmps); ++i) {
     72             int h = SkToInt((4 + i) * 1024);
     73 
     74             fTallBmps[i].fItemCnt = make_bm(&fTallBmps[i].fBmp, h);
     75         }
     76     }
     77 
     78     void onDraw(SkCanvas* canvas) override {
     79         canvas->scale(1.3f, 1.3f);
     80         for (size_t i = 0; i < SK_ARRAY_COUNT(fTallBmps); ++i) {
     81             SkASSERT(fTallBmps[i].fItemCnt > 10);
     82             SkBitmap bmp = fTallBmps[i].fBmp;
     83             // Draw the last 10 elements of the bitmap.
     84             int startItem = fTallBmps[i].fItemCnt - 10;
     85             int itemHeight = bmp.height() / fTallBmps[i].fItemCnt;
     86             SkIRect subRect = SkIRect::MakeLTRB(0, startItem * itemHeight,
     87                                                bmp.width(), bmp.height());
     88             SkRect dstRect = SkRect::MakeWH(SkIntToScalar(bmp.width()), 10.f * itemHeight);
     89             SkPaint paint;
     90             paint.setFilterQuality(kLow_SkFilterQuality);
     91             canvas->drawBitmapRect(bmp, subRect, dstRect, &paint);
     92             canvas->translate(SkIntToScalar(bmp.width() + 10), 0);
     93         }
     94     }
     95 
     96 private:
     97     struct {
     98         SkBitmap fBmp;
     99         int      fItemCnt;
    100     } fTallBmps[8];
    101     typedef skiagm::GM INHERITED;
    102 };
    103 
    104 //////////////////////////////////////////////////////////////////////////////
    105 
    106 DEF_GM(return new TallStretchedBitmapsGM;)
    107