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      1 /*
      2  * Copyright 2013 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 #include "SkColorMatrixFilter.h"
     10 #include "SkColorFilterImageFilter.h"
     11 #include "SkTileImageFilter.h"
     12 #include "SkBitmapSource.h"
     13 
     14 #define WIDTH 400
     15 #define HEIGHT 100
     16 #define MARGIN 12
     17 
     18 namespace skiagm {
     19 
     20 class TileImageFilterGM : public GM {
     21 public:
     22     TileImageFilterGM() : fInitialized(false) {
     23         this->setBGColor(0xFF000000);
     24     }
     25 
     26 protected:
     27     virtual SkString onShortName() {
     28         return SkString("tileimagefilter");
     29     }
     30 
     31     void make_bitmap() {
     32         fBitmap.allocN32Pixels(50, 50);
     33         SkCanvas canvas(fBitmap);
     34         canvas.clear(0xFF000000);
     35         SkPaint paint;
     36         paint.setAntiAlias(true);
     37         sk_tool_utils::set_portable_typeface(&paint);
     38         paint.setColor(0xD000D000);
     39         paint.setTextSize(SkIntToScalar(50));
     40         const char* str = "e";
     41         canvas.drawText(str, strlen(str), SkIntToScalar(10), SkIntToScalar(45), paint);
     42     }
     43 
     44     void make_checkerboard() {
     45         fCheckerboard.allocN32Pixels(80, 80);
     46         SkCanvas canvas(fCheckerboard);
     47         canvas.clear(0x00000000);
     48         SkPaint darkPaint;
     49         darkPaint.setColor(0xFF404040);
     50         SkPaint lightPaint;
     51         lightPaint.setColor(0xFFA0A0A0);
     52         for (int y = 0; y < 80; y += 16) {
     53           for (int x = 0; x < 80; x += 16) {
     54             canvas.save();
     55             canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
     56             canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
     57             canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
     58             canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
     59             canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
     60             canvas.restore();
     61           }
     62         }
     63     }
     64 
     65     virtual SkISize onISize() {
     66         return SkISize::Make(WIDTH, HEIGHT);
     67     }
     68 
     69     virtual void onDraw(SkCanvas* canvas) {
     70         if (!fInitialized) {
     71             make_bitmap();
     72             make_checkerboard();
     73             fInitialized = true;
     74         }
     75         canvas->clear(0x00000000);
     76 
     77         int x = 0, y = 0;
     78         for (size_t i = 0; i < 4; i++) {
     79             SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
     80             SkRect srcRect = SkRect::MakeXYWH(SkIntToScalar(bitmap->width()/4),
     81                                               SkIntToScalar(bitmap->height()/4),
     82                                               SkIntToScalar(bitmap->width()/(i+1)),
     83                                               SkIntToScalar(bitmap->height()/(i+1)));
     84             SkRect dstRect = SkRect::MakeXYWH(SkIntToScalar(i * 8),
     85                                               SkIntToScalar(i * 4),
     86                                               SkIntToScalar(bitmap->width() - i * 12),
     87                                               SkIntToScalar(bitmap->height()) - i * 12);
     88             SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
     89             SkAutoTUnref<SkImageFilter> filter(
     90                 SkTileImageFilter::Create(srcRect, dstRect, tileInput));
     91             canvas->save();
     92             canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
     93             SkPaint paint;
     94             paint.setImageFilter(filter);
     95             canvas->drawBitmap(fBitmap, 0, 0, &paint);
     96             canvas->restore();
     97             x += bitmap->width() + MARGIN;
     98             if (x + bitmap->width() > WIDTH) {
     99                 x = 0;
    100                 y += bitmap->height() + MARGIN;
    101             }
    102         }
    103 
    104         SkScalar matrix[20] = { SK_Scalar1, 0, 0, 0, 0,
    105                                 0, SK_Scalar1, 0, 0, 0,
    106                                 0, 0, SK_Scalar1, 0, 0,
    107                                 0, 0, 0, SK_Scalar1, 0 };
    108 
    109         SkRect srcRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width()),
    110                                         SkIntToScalar(fBitmap.height()));
    111         SkRect dstRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() * 2),
    112                                         SkIntToScalar(fBitmap.height() * 2));
    113         SkAutoTUnref<SkImageFilter> tile(SkTileImageFilter::Create(srcRect, dstRect, NULL));
    114         SkAutoTUnref<SkColorFilter> cf(SkColorMatrixFilter::Create(matrix));
    115 
    116         SkAutoTUnref<SkImageFilter> cfif(SkColorFilterImageFilter::Create(cf, tile.get()));
    117         SkPaint paint;
    118         paint.setImageFilter(cfif);
    119         canvas->save();
    120         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
    121         canvas->clipRect(dstRect);
    122         canvas->saveLayer(&dstRect, &paint);
    123         canvas->drawBitmap(fBitmap, 0, 0);
    124         canvas->restore();
    125         canvas->restore();
    126     }
    127 private:
    128     typedef GM INHERITED;
    129     SkBitmap fBitmap, fCheckerboard;
    130     bool fInitialized;
    131 };
    132 
    133 //////////////////////////////////////////////////////////////////////////////
    134 
    135 static GM* MyFactory(void*) { return new TileImageFilterGM; }
    136 static GMRegistry reg(MyFactory);
    137 
    138 }
    139