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 "SkView.h"
10#include "SkCanvas.h"
11#include "SkGradientShader.h"
12#include "SkGraphics.h"
13#include "SkImageDecoder.h"
14#include "SkPath.h"
15#include "SkRegion.h"
16#include "SkShader.h"
17#include "SkUtils.h"
18#include "SkXfermode.h"
19#include "SkColorPriv.h"
20#include "SkColorFilter.h"
21#include "SkTime.h"
22
23static const char* gNames[] = {
24    "/skimages/background_01.png"
25};
26
27class Filter2View : public SampleView {
28public:
29    SkBitmap*   fBitmaps;
30    int         fBitmapCount;
31    int         fCurrIndex;
32
33    Filter2View() {
34        fBitmapCount = SK_ARRAY_COUNT(gNames)*2;
35        fBitmaps = new SkBitmap[fBitmapCount];
36
37        for (int i = 0; i < fBitmapCount/2; i++) {
38            SkImageDecoder::DecodeFile(gNames[i], &fBitmaps[i], kN32_SkColorType,
39                                       SkImageDecoder::kDecodePixels_Mode, NULL);
40        }
41        for (int i = fBitmapCount/2; i < fBitmapCount; i++) {
42            SkImageDecoder::DecodeFile(gNames[i-fBitmapCount/2], &fBitmaps[i], kRGB_565_SkColorType,
43                                       SkImageDecoder::kDecodePixels_Mode, NULL);
44        }
45        fCurrIndex = 0;
46
47        this->setBGColor(SK_ColorGRAY);
48    }
49
50    virtual ~Filter2View() {
51        delete[] fBitmaps;
52    }
53
54protected:
55    // overrides from SkEventSink
56    virtual bool onQuery(SkEvent* evt) {
57        if (SampleCode::TitleQ(*evt)) {
58            SkString str("Filter/Dither ");
59            str.append(gNames[fCurrIndex]);
60            SampleCode::TitleR(evt, str.c_str());
61            return true;
62        }
63        return this->INHERITED::onQuery(evt);
64    }
65
66    virtual void onDrawContent(SkCanvas* canvas) {
67        canvas->translate(SkIntToScalar(10), SkIntToScalar(50));
68
69        const SkScalar W = SkIntToScalar(fBitmaps[0].width() + 1);
70        const SkScalar H = SkIntToScalar(fBitmaps[0].height() + 1);
71        SkPaint paint;
72
73        const SkScalar scale = 0.897917f;
74        canvas->scale(SK_Scalar1, scale);
75
76        for (int k = 0; k < 2; k++) {
77            paint.setFilterLevel(k == 1 ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
78            for (int j = 0; j < 2; j++) {
79                paint.setDither(j == 1);
80                for (int i = 0; i < fBitmapCount; i++) {
81                    SkScalar x = (k * fBitmapCount + j) * W;
82                    SkScalar y = i * H;
83                    x = SkScalarRoundToScalar(x);
84                    y = SkScalarRoundToScalar(y);
85                    canvas->drawBitmap(fBitmaps[i], x, y, &paint);
86                    if (i == 0) {
87                        SkPaint p;
88                        p.setAntiAlias(true);
89                        p.setTextAlign(SkPaint::kCenter_Align);
90                        p.setTextSize(SkIntToScalar(18));
91                        SkString s("dither=");
92                        s.appendS32(paint.isDither());
93                        s.append(" filter=");
94                        s.appendS32(paint.getFilterLevel() != SkPaint::kNone_FilterLevel);
95                        canvas->drawText(s.c_str(), s.size(), x + W/2,
96                                         y - p.getTextSize(), p);
97                    }
98                    if (k+j == 2) {
99                        SkPaint p;
100                        p.setAntiAlias(true);
101                        p.setTextSize(SkIntToScalar(18));
102                        SkString s;
103                        s.append(" depth=");
104                        s.appendS32(fBitmaps[i].colorType() == kRGB_565_SkColorType ? 16 : 32);
105                        canvas->drawText(s.c_str(), s.size(), x + W + SkIntToScalar(4),
106                                         y + H/2, p);
107                    }
108                }
109            }
110        }
111    }
112
113private:
114    typedef SampleView INHERITED;
115};
116
117//////////////////////////////////////////////////////////////////////////////
118
119static SkView* MyFactory() { return new Filter2View; }
120static SkViewRegister reg(MyFactory);
121