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 "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 : fFilename(imageFilename),
28 fHorizontalVelocity(horizontalVelocity),
29 fVerticalVelocity(verticalVelocity) {
30 SkString resourcePath = GetResourcePath();
31 resourcePath.append("/");
32 resourcePath.append(fFilename);
33
34 SkImageDecoder* codec = NULL;
35 SkFILEStream stream(resourcePath.c_str());
36 if (stream.isValid()) {
37 codec = SkImageDecoder::Factory(&stream);
38 }
39 if (codec) {
40 stream.rewind();
41 codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
42 SkDELETE(codec);
43 } else {
44 fBM.allocN32Pixels(1, 1);
45 *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
46 }
47 fCurPos = SkPoint::Make(0,0);
48 fSize = 200;
49 }
50
51 protected:
52 SkBitmap fBM;
53 SkString fFilename;
54 SkScalar fSize;
55 float fHorizontalVelocity, fVerticalVelocity;
56
57 SkPoint fCurPos;
58
59 // overrides from SkEventSink
onQuery(SkEvent * evt)60 virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
61 if (SampleCode::TitleQ(*evt)) {
62 SampleCode::TitleR(evt, "SubpixelTranslate");
63 return true;
64 }
65 return this->INHERITED::onQuery(evt);
66 }
67
onDrawContent(SkCanvas * canvas)68 virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
69
70 static const SkPaint::FilterLevel gLevels[] = {
71 SkPaint::kNone_FilterLevel,
72 SkPaint::kLow_FilterLevel,
73 SkPaint::kMedium_FilterLevel,
74 SkPaint::kHigh_FilterLevel
75 };
76
77 SkPaint paint;
78 paint.setTextSize(48);
79
80 paint.setAntiAlias(true);
81 for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
82 paint.setFilterLevel(gLevels[i]);
83 SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY, fSize, fSize );
84 canvas->drawBitmapRect( fBM, r, &paint );
85 }
86
87 canvas->drawText( "AA Scaled", strlen("AA Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fSize + 10), fCurPos.fY + fSize/2, paint );
88
89 paint.setAntiAlias(false);
90 for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
91 paint.setFilterLevel(gLevels[i]);
92 SkRect r = SkRect::MakeXYWH( fCurPos.fX + i * (fSize + 10), fCurPos.fY + fSize + 10, fSize, fSize );
93 canvas->drawBitmapRect( fBM, r, &paint );
94 }
95 canvas->drawText( "Scaled", strlen("Scaled"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fSize + 10), fCurPos.fY + fSize + 10 + fSize/2, paint );
96
97 paint.setAntiAlias(true);
98 for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
99 paint.setFilterLevel(gLevels[i]);
100 canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10), &paint );
101 }
102
103 canvas->drawText( "AA No Scale", strlen("AA No Scale"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fSize/2, paint );
104
105 paint.setAntiAlias(false);
106 for (size_t i = 0; i < SK_ARRAY_COUNT(gLevels); ++i) {
107 paint.setFilterLevel(gLevels[i]);
108 canvas->drawBitmap( fBM, fCurPos.fX + i * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10, &paint );
109 }
110
111 canvas->drawText( "No Scale", strlen("No Scale"), fCurPos.fX + SK_ARRAY_COUNT(gLevels) * (fBM.width() + 10), fCurPos.fY + 2*(fSize + 10) + fBM.height() + 10 + fSize/2, paint );
112
113
114 fCurPos.fX += fHorizontalVelocity;
115 fCurPos.fY += fVerticalVelocity;
116 this->inval(NULL);
117 }
118
119 private:
120 typedef SampleView INHERITED;
121 };
122
123 //////////////////////////////////////////////////////////////////////////////
124
MyFactory()125 static SkView* MyFactory() { return new SubpixelTranslateView("mandrill_256.png", .05f, .05f); }
126 static SkViewRegister reg(MyFactory);
127