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
14int make_bm(SkBitmap* bm, int height) {
15    static const int kRadius = 22;
16    static const int kMargin = 8;
17    static const SkScalar kStartAngle = 0;
18    static const SkScalar kDAngle = 25;
19    static const SkScalar kSweep = 320;
20    static const 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
57class TallStretchedBitmapsGM : public skiagm::GM {
58public:
59    TallStretchedBitmapsGM() {}
60
61protected:
62    SkString onShortName() override {
63        return SkString("tall_stretched_bitmaps");
64    }
65
66    SkISize onISize() override {
67        return SkISize::Make(750, 750);
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
96private:
97    struct {
98        SkBitmap fBmp;
99        int      fItemCnt;
100    } fTallBmps[8];
101    typedef skiagm::GM INHERITED;
102};
103
104//////////////////////////////////////////////////////////////////////////////
105
106DEF_GM(return SkNEW(TallStretchedBitmapsGM);)
107
108