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
10 #include "Resources.h"
11 #include "SampleCode.h"
12 #include "SkBlurMaskFilter.h"
13 #include "SkCanvas.h"
14 #include "SkColorPriv.h"
15 #include "SkImageDecoder.h"
16 #include "SkPath.h"
17 #include "SkRandom.h"
18 #include "SkStream.h"
19 #include "SkTime.h"
20
21 // Intended to exercise pixel snapping observed with scaled images (and
22 // with non-scaled images, but for a different reason): Bug 1145
23
24 class IdentityScaleView : public SampleView {
25 public:
IdentityScaleView(const char imageFilename[])26 IdentityScaleView(const char imageFilename[]) {
27 SkString resourcePath = GetResourcePath(imageFilename);
28 SkImageDecoder* codec = nullptr;
29 SkFILEStream stream(resourcePath.c_str());
30 if (stream.isValid()) {
31 codec = SkImageDecoder::Factory(&stream);
32 }
33 if (codec) {
34 stream.rewind();
35 codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
36 delete codec;
37 } else {
38 fBM.allocN32Pixels(1, 1);
39 *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
40 }
41 }
42
43 protected:
44 SkBitmap fBM;
45
46 // overrides from SkEventSink
onQuery(SkEvent * evt)47 bool onQuery(SkEvent* evt) override {
48 if (SampleCode::TitleQ(*evt)) {
49 SampleCode::TitleR(evt, "IdentityScale");
50 return true;
51 }
52 return this->INHERITED::onQuery(evt);
53 }
54
onDrawContent(SkCanvas * canvas)55 void onDrawContent(SkCanvas* canvas) override {
56
57 SkPaint paint;
58
59 paint.setAntiAlias(true);
60 paint.setTextSize(48);
61 paint.setFilterQuality(kHigh_SkFilterQuality);
62
63 SkTime::DateTime time;
64 SkTime::GetDateTime(&time);
65
66 bool use_scale = (time.fSecond % 2 == 1);
67 const char *text;
68
69 canvas->save();
70 if (use_scale) {
71 text = "Scaled = 1";
72 } else {
73
74 SkRect r = { 100, 100, 356, 356 };
75 SkPath clipPath;
76 clipPath.addRoundRect(r, SkIntToScalar(5), SkIntToScalar(5));
77 canvas->clipPath(clipPath, SkRegion::kIntersect_Op, SkToBool(1));
78 text = "Scaled = 0";
79 }
80 canvas->drawBitmap( fBM, 100, 100, &paint );
81 canvas->restore();
82 canvas->drawText( text, strlen(text), 100, 400, paint );
83 this->inval(nullptr);
84 }
85
86 private:
87 typedef SampleView INHERITED;
88 };
89
90 //////////////////////////////////////////////////////////////////////////////
91
MyFactory()92 static SkView* MyFactory() { return new IdentityScaleView("mandrill_256.png"); }
93 static SkViewRegister reg(MyFactory);
94