SampleIdentityScale.cpp revision d3ebb48320cf1b7e969974673e4bd7743816985e 
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
24class IdentityScaleView : public SampleView {
25public:
26    IdentityScaleView(const char imageFilename[]) {
27      SkString resourcePath = GetResourcePath(imageFilename);
28      SkImageDecoder* codec = NULL;
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          SkDELETE(codec);
37      } else {
38          fBM.allocN32Pixels(1, 1);
39          *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
40      }
41    }
42
43protected:
44    SkBitmap fBM;
45
46    // overrides from SkEventSink
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
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(NULL);
84    }
85
86private:
87    typedef SampleView INHERITED;
88};
89
90//////////////////////////////////////////////////////////////////////////////
91
92static SkView* MyFactory() { return new IdentityScaleView("mandrill_256.png"); }
93static SkViewRegister reg(MyFactory);
94