1 /*
2 * Copyright 2011 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 "SampleCode.h"
9 #include "SkCanvas.h"
10 #include "SkColorPriv.h"
11 #include "SkGradientShader.h"
12 #include "SkPath.h"
13 #include "SkUtils.h"
14 #include "SkView.h"
15
draw_rect(SkCanvas * canvas,const SkRect & r,const SkPaint & p)16 static void draw_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
17 canvas->drawRect(r, p);
18
19 SkPaint frame(p);
20 frame.setShader(nullptr);
21 frame.setStyle(SkPaint::kStroke_Style);
22 canvas->drawRect(r, frame);
23 }
24
draw_gradient(SkCanvas * canvas)25 static void draw_gradient(SkCanvas* canvas) {
26 SkRect r = { 0, 0, SkIntToScalar(256), SkIntToScalar(32) };
27 SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fTop } };
28 SkColor colors[] = { 0xFF000000, 0xFFFF0000 };
29 SkShader* s = SkGradientShader::CreateLinear(pts, colors, nullptr, 2,
30 SkShader::kClamp_TileMode);
31
32 SkPaint p;
33 p.setShader(s)->unref();
34 draw_rect(canvas, r, p);
35
36 canvas->translate(0, SkIntToScalar(40));
37 p.setDither(true);
38 draw_rect(canvas, r, p);
39 }
40
test_pathregion()41 static bool test_pathregion() {
42 SkPath path;
43 SkRegion region;
44 path.moveTo(25071800.f, -141823808.f);
45 path.lineTo(25075500.f, -141824000.f);
46 path.lineTo(25075400.f, -141827712.f);
47 path.lineTo(25071810.f, -141827600.f);
48 path.close();
49
50 SkIRect bounds;
51 path.getBounds().round(&bounds);
52 SkRegion clip(bounds);
53 return region.setPath(path, clip); // <-- !! DOWN !!
54 }
55
make_bitmap()56 static SkBitmap make_bitmap() {
57 SkPMColor c[256];
58 for (int i = 0; i < 256; i++) {
59 c[i] = SkPackARGB32(0xFF, i, 0, 0);
60 }
61 SkColorTable* ctable = new SkColorTable(c, 256);
62
63 SkBitmap bm;
64 bm.allocPixels(SkImageInfo::Make(256, 32, kIndex_8_SkColorType, kPremul_SkAlphaType),
65 nullptr, ctable);
66 ctable->unref();
67
68 bm.lockPixels();
69 for (int y = 0; y < bm.height(); y++) {
70 uint8_t* p = bm.getAddr8(0, y);
71 for (int x = 0; x < 256; x++) {
72 p[x] = x;
73 }
74 }
75 bm.unlockPixels();
76 return bm;
77 }
78
79 class DitherBitmapView : public SampleView {
80 SkBitmap fBM8;
81 SkBitmap fBM32;
82 bool fResult;
83 public:
DitherBitmapView()84 DitherBitmapView() {
85 fResult = test_pathregion();
86 fBM8 = make_bitmap();
87 fBM8.copyTo(&fBM32, kN32_SkColorType);
88
89 this->setBGColor(0xFFDDDDDD);
90 }
91
92 protected:
93 // overrides from SkEventSink
onQuery(SkEvent * evt)94 virtual bool onQuery(SkEvent* evt) {
95 if (SampleCode::TitleQ(*evt)) {
96 SampleCode::TitleR(evt, "DitherBitmap");
97 return true;
98 }
99 return this->INHERITED::onQuery(evt);
100 }
101
setBitmapOpaque(SkBitmap * bm,bool isOpaque)102 static void setBitmapOpaque(SkBitmap* bm, bool isOpaque) {
103 SkAutoLockPixels alp(*bm); // needed for ctable
104 bm->setAlphaType(isOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
105 }
106
draw2(SkCanvas * canvas,const SkBitmap & bm)107 static void draw2(SkCanvas* canvas, const SkBitmap& bm) {
108 SkPaint paint;
109 SkBitmap bitmap(bm);
110
111 setBitmapOpaque(&bitmap, false);
112 paint.setDither(false);
113 canvas->drawBitmap(bitmap, 0, 0, &paint);
114 paint.setDither(true);
115 canvas->drawBitmap(bitmap, 0, SkIntToScalar(bm.height() + 10), &paint);
116
117 setBitmapOpaque(&bitmap, true);
118 SkScalar x = SkIntToScalar(bm.width() + 10);
119 paint.setDither(false);
120 canvas->drawBitmap(bitmap, x, 0, &paint);
121 paint.setDither(true);
122 canvas->drawBitmap(bitmap, x, SkIntToScalar(bm.height() + 10), &paint);
123 }
124
onDrawContent(SkCanvas * canvas)125 virtual void onDrawContent(SkCanvas* canvas) {
126 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
127
128 draw2(canvas, fBM8);
129 canvas->translate(0, SkIntToScalar(fBM8.height() *3));
130 draw2(canvas, fBM32);
131
132 canvas->translate(0, SkIntToScalar(fBM8.height() *3));
133 draw_gradient(canvas);
134
135 char resultTrue[] = "SkRegion::setPath returned true";
136 char resultFalse[] = "SkRegion::setPath returned false";
137 SkPaint p;
138 if (fResult)
139 canvas->drawText(resultTrue, sizeof(resultTrue) - 1, 0, 50, p);
140 else
141 canvas->drawText(resultFalse, sizeof(resultFalse) - 1, 0, 50, p);
142 }
143
144 private:
145 typedef SampleView INHERITED;
146 };
147
148 //////////////////////////////////////////////////////////////////////////////
149
MyFactory()150 static SkView* MyFactory() { return new DitherBitmapView; }
151 static SkViewRegister reg(MyFactory);
152