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 "DecodeFile.h"
9 #include "gm.h"
10
11 #include "Resources.h"
12 #include "SampleCode.h"
13 #include "SkBlurMaskFilter.h"
14 #include "SkCanvas.h"
15 #include "SkColorPriv.h"
16 #include "SkRandom.h"
17 #include "SkStream.h"
18
19 // Intended to exercise pixel snapping observed with scaled images (and
20 // with non-scaled images, but for a different reason): Bug 1145
21
22 class SubpixelTranslateView : public SampleView {
23 public:
SubpixelTranslateView(const char imageFilename[],float horizontalVelocity,float verticalVelocity)24 SubpixelTranslateView(const char imageFilename[],
25 float horizontalVelocity,
26 float verticalVelocity)
27 : fHorizontalVelocity(horizontalVelocity),
28 fVerticalVelocity(verticalVelocity) {
29 SkString resourcePath = GetResourcePath(imageFilename);
30 if (!decode_file(resourcePath.c_str(), &fBM)) {
31 fBM.allocN32Pixels(1, 1);
32 *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
33 }
34 fCurPos = SkPoint::Make(0,0);
35 fSize = 200;
36 }
37
38 protected:
39 SkBitmap fBM;
40 SkScalar fSize;
41 float fHorizontalVelocity, fVerticalVelocity;
42
43 SkPoint fCurPos;
44
45 // overrides from SkEventSink
onQuery(SkEvent * evt)46 bool onQuery(SkEvent* evt) override {
47 if (SampleCode::TitleQ(*evt)) {
48 SampleCode::TitleR(evt, "SubpixelTranslate");
49 return true;
50 }
51 return this->INHERITED::onQuery(evt);
52 }
53
onDrawContent(SkCanvas * canvas)54 void onDrawContent(SkCanvas* canvas) override {
55
56 static const SkFilterQuality gQualitys[] = {
57 kNone_SkFilterQuality,
58 kLow_SkFilterQuality,
59 kMedium_SkFilterQuality,
60 kHigh_SkFilterQuality
61 };
62
63 SkPaint paint;
64 paint.setTextSize(48);
65 paint.setSubpixelText(true);
66
67 paint.setAntiAlias(true);
68 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
69 paint.setFilterQuality(gQualitys[i]);
70 SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize );
71 canvas->drawBitmapRect( fBM, r, &paint );
72 }
73
74 canvas->drawText( "AA Scaled", strlen("AA Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10), fCurPos.fY + fSize/2, paint );
75
76 paint.setAntiAlias(false);
77 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
78 paint.setFilterQuality(gQualitys[i]);
79 SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY + fSize + 10, fSize, fSize );
80 canvas->drawBitmapRect( fBM, r, &paint );
81 }
82 canvas->drawText( "Scaled", strlen("Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fSize + 10), fCurPos.fY + fSize + 10 + fSize/2, paint );
83
84 paint.setAntiAlias(true);
85 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
86 paint.setFilterQuality(gQualitys[i]);
87 canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10), &paint );
88 }
89
90 canvas->drawText( "AA No Scale", strlen("AA No Scale"), fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fSize/2, paint );
91
92 paint.setAntiAlias(false);
93 for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
94 paint.setFilterQuality(gQualitys[i]);
95 canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10, &paint );
96 }
97
98 canvas->drawText( "No Scale", strlen("No Scale"), fCurPos.fX + SK_ARRAY_COUNT(gQualitys) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10 + fSize/2, paint );
99
100
101 fCurPos.fX += fHorizontalVelocity;
102 fCurPos.fY += fVerticalVelocity;
103 this->inval(nullptr);
104 }
105
106 private:
107 typedef SampleView INHERITED;
108 };
109
110 //////////////////////////////////////////////////////////////////////////////
111
MyFactory()112 static SkView* MyFactory() { return new SubpixelTranslateView("mandrill_256.png", .05f, .05f); }
113 static SkViewRegister reg(MyFactory);
114