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