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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkImage.h"
12 #include "include/core/SkPaint.h"
13 #include "include/core/SkRect.h"
14 #include "include/core/SkScalar.h"
15 #include "include/core/SkSize.h"
16 #include "include/core/SkString.h"
17 #include "include/core/SkTiledImageUtils.h"
18 #include "include/core/SkTypes.h"
19 #include "include/private/base/SkTo.h"
20 #include "src/base/SkRandom.h"
21
make_bm(SkBitmap * bm,int height)22 int make_bm(SkBitmap* bm, int height) {
23 constexpr int kRadius = 22;
24 constexpr int kMargin = 8;
25 constexpr SkScalar kStartAngle = 0;
26 constexpr SkScalar kDAngle = 25;
27 constexpr SkScalar kSweep = 320;
28 constexpr SkScalar kThickness = 8;
29
30 int count = (height / (2 * kRadius + kMargin));
31 height = count * (2 * kRadius + kMargin);
32
33 bm->allocN32Pixels(2 * (kRadius + kMargin), height);
34 SkRandom random;
35
36 SkCanvas wholeCanvas(*bm);
37 wholeCanvas.clear(0x00000000);
38
39 SkScalar angle = kStartAngle;
40 for (int i = 0; i < count; ++i) {
41 SkPaint paint;
42 // The sw rasterizer disables AA for large canvii. So we make a small canvas for each draw.
43 SkBitmap smallBM;
44 SkIRect subRect = SkIRect::MakeXYWH(0, i * (kMargin + 2 * kRadius),
45 2 * kRadius + kMargin, 2 * kRadius + kMargin);
46 bm->extractSubset(&smallBM, subRect);
47 SkCanvas canvas(smallBM);
48 canvas.translate(kMargin + kRadius, kMargin + kRadius);
49
50 paint.setAntiAlias(true);
51 paint.setColor(random.nextU() | 0xFF000000);
52 paint.setStyle(SkPaint::kStroke_Style);
53 paint.setStrokeWidth(kThickness);
54 paint.setStrokeCap(SkPaint::kRound_Cap);
55 SkScalar radius = kRadius - kThickness / 2;
56 SkRect bounds = SkRect::MakeLTRB(-radius, -radius, radius, radius);
57
58 canvas.drawArc(bounds, angle, kSweep, false, paint);
59 angle += kDAngle;
60 }
61 bm->setImmutable();
62 return count;
63 }
64
65 class TallStretchedBitmapsGM : public skiagm::GM {
66 public:
TallStretchedBitmapsGM()67 TallStretchedBitmapsGM() {}
68
69 protected:
getName() const70 SkString getName() const override { return SkString("tall_stretched_bitmaps"); }
71
getISize()72 SkISize getISize() override { return SkISize::Make(730, 690); }
73
onOnceBeforeDraw()74 void onOnceBeforeDraw() override {
75 for (size_t i = 0; i < std::size(fTallBmps); ++i) {
76 int h = SkToInt((4 + i) * 1024);
77
78 fTallBmps[i].fItemCnt = make_bm(&fTallBmps[i].fBmp, h);
79 }
80 }
81
onDraw(SkCanvas * canvas)82 void onDraw(SkCanvas* canvas) override {
83 canvas->scale(1.3f, 1.3f);
84 for (size_t i = 0; i < std::size(fTallBmps); ++i) {
85 SkASSERT(fTallBmps[i].fItemCnt > 10);
86 SkBitmap bmp = fTallBmps[i].fBmp;
87 // Draw the last 10 elements of the bitmap.
88 int startItem = fTallBmps[i].fItemCnt - 10;
89 int itemHeight = bmp.height() / fTallBmps[i].fItemCnt;
90 SkIRect subRect = SkIRect::MakeLTRB(0, startItem * itemHeight,
91 bmp.width(), bmp.height());
92 SkRect dstRect = SkRect::MakeWH(SkIntToScalar(bmp.width()), 10.f * itemHeight);
93 SkTiledImageUtils::DrawImageRect(canvas, bmp.asImage(),
94 SkRect::Make(subRect), dstRect,
95 SkSamplingOptions(SkFilterMode::kLinear), nullptr,
96 SkCanvas::kStrict_SrcRectConstraint);
97 canvas->translate(SkIntToScalar(bmp.width() + 10), 0);
98 }
99 }
100
101 private:
102 struct {
103 SkBitmap fBmp;
104 int fItemCnt;
105 } fTallBmps[8];
106 using INHERITED = skiagm::GM;
107 };
108
109 //////////////////////////////////////////////////////////////////////////////
110
111 DEF_GM(return new TallStretchedBitmapsGM;)
112