gm/tileimagefilter.cpp

/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "sk_tool_utils.h"
#include "SkBitmapSource.h"
#include "SkColorFilterImageFilter.h"
#include "SkColorMatrixFilter.h"
#include "SkTileImageFilter.h"
#include "gm.h"

#define WIDTH 400
#define HEIGHT 100
#define MARGIN 12

namespace skiagm {

class TileImageFilterGM : public GM {
public:
    TileImageFilterGM() {
        this->setBGColor(0xFF000000);
    }

protected:
    SkString onShortName() override {
        return SkString("tileimagefilter");
    }

    SkISize onISize() override{
        return SkISize::Make(WIDTH, HEIGHT);
    }

    void onOnceBeforeDraw() override {
        fBitmap = sk_tool_utils::create_string_bitmap(50, 50, 0xD000D000, 10, 45, 50, "e");

        fCheckerboard = sk_tool_utils::create_checkerboard_bitmap(
                                                        80, 80,
                                                        sk_tool_utils::color_to_565(0xFFA0A0A0),
                                                        sk_tool_utils::color_to_565(0xFF404040),
                                                        8);
    }

    void onDraw(SkCanvas* canvas) override {
        canvas->clear(SK_ColorBLACK);

        int x = 0, y = 0;
        for (size_t i = 0; i < 4; i++) {
            SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
            SkRect srcRect = SkRect::MakeXYWH(SkIntToScalar(bitmap->width()/4),
                                              SkIntToScalar(bitmap->height()/4),
                                              SkIntToScalar(bitmap->width()/(i+1)),
                                              SkIntToScalar(bitmap->height()/(i+1)));
            SkRect dstRect = SkRect::MakeXYWH(SkIntToScalar(i * 8),
                                              SkIntToScalar(i * 4),
                                              SkIntToScalar(bitmap->width() - i * 12),
                                              SkIntToScalar(bitmap->height()) - i * 12);
            SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
            SkAutoTUnref<SkImageFilter> filter(
                SkTileImageFilter::Create(srcRect, dstRect, tileInput));
            canvas->save();
            canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
            SkPaint paint;
            paint.setImageFilter(filter);
            canvas->drawBitmap(fBitmap, 0, 0, &paint);
            canvas->restore();
            x += bitmap->width() + MARGIN;
            if (x + bitmap->width() > WIDTH) {
                x = 0;
                y += bitmap->height() + MARGIN;
            }
        }

        SkScalar matrix[20] = { SK_Scalar1, 0, 0, 0, 0,
                                0, SK_Scalar1, 0, 0, 0,
                                0, 0, SK_Scalar1, 0, 0,
                                0, 0, 0, SK_Scalar1, 0 };

        SkRect srcRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width()),
                                        SkIntToScalar(fBitmap.height()));
        SkRect dstRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() * 2),
                                        SkIntToScalar(fBitmap.height() * 2));
        SkAutoTUnref<SkImageFilter> tile(SkTileImageFilter::Create(srcRect, dstRect, nullptr));
        SkAutoTUnref<SkColorFilter> cf(SkColorMatrixFilter::Create(matrix));

        SkAutoTUnref<SkImageFilter> cfif(SkColorFilterImageFilter::Create(cf, tile.get()));
        SkPaint paint;
        paint.setImageFilter(cfif);
        canvas->save();
        canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
        canvas->clipRect(dstRect);
        canvas->saveLayer(&dstRect, &paint);
        canvas->drawBitmap(fBitmap, 0, 0);
        canvas->restore();
        canvas->restore();
    }
private:
    SkBitmap fBitmap;
    SkBitmap fCheckerboard;

    typedef GM INHERITED;
};

//////////////////////////////////////////////////////////////////////////////

DEF_GM(return new TileImageFilterGM;)
}