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
make_bm(SkBitmap * bm,int height)14 int 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
57 class TallStretchedBitmapsGM : public skiagm::GM {
58 public:
TallStretchedBitmapsGM()59 TallStretchedBitmapsGM() {}
60
61 protected:
onShortName()62 SkString onShortName() override {
63 return SkString("tall_stretched_bitmaps");
64 }
65
onISize()66 SkISize onISize() override {
67 return SkISize::Make(750, 750);
68 }
69
onOnceBeforeDraw()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
onDraw(SkCanvas * canvas)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 SkNEW(TallStretchedBitmapsGM);)
107
108