skia2/gm/blurroundrect.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 "gm/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRRect.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "src/core/SkBlurMask.h"

/*
 * Spits out a dummy gradient to test blur with shader on paint
 */
static sk_sp<SkShader> MakeRadial() {
    SkPoint pts[2] = {
        { 0, 0 },
        { SkIntToScalar(100), SkIntToScalar(100) }
    };
    SkTileMode tm = SkTileMode::kClamp;
    const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, };
    const SkScalar pos[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
    SkMatrix scale;
    scale.setScale(0.5f, 0.5f);
    scale.postTranslate(5.f, 5.f);
    SkPoint center0, center1;
    center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
    center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
                SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
    return SkGradientShader::MakeTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7,
                                                 center0, (pts[1].fX - pts[0].fX) / 2,
                                                 colors, pos, SK_ARRAY_COUNT(colors), tm,
                                                 0, &scale);
}

// Simpler blurred RR test cases where all the radii are the same.
class SimpleBlurRoundRectGM : public skiagm::GM {
    SkString onShortName() override { return SkString("simpleblurroundrect"); }

    SkISize onISize() override { return {1000, 500}; }

    void onDraw(SkCanvas* canvas) override {
        canvas->scale(1.5f, 1.5f);
        canvas->translate(50,50);

        const float blurRadii[] = { 1,5,10,20 };
        const int cornerRadii[] = { 1,5,10,20 };
        const SkRect r = SkRect::MakeWH(SkIntToScalar(25), SkIntToScalar(25));
        for (size_t i = 0; i < SK_ARRAY_COUNT(blurRadii); ++i) {
            SkAutoCanvasRestore autoRestore(canvas, true);
            canvas->translate(0, (r.height() + SkIntToScalar(50)) * i);
            for (size_t j = 0; j < SK_ARRAY_COUNT(cornerRadii); ++j) {
                for (int k = 0; k <= 1; k++) {
                    SkPaint paint;
                    paint.setColor(SK_ColorBLACK);
                    paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
                                   SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(blurRadii[i]))));

                    bool useRadial = SkToBool(k);
                    if (useRadial) {
                        paint.setShader(MakeRadial());
                    }

                    SkRRect rrect;
                    rrect.setRectXY(r, SkIntToScalar(cornerRadii[j]),
                                    SkIntToScalar(cornerRadii[j]));
                    canvas->drawRRect(rrect, paint);
                    canvas->translate(r.width() + SkIntToScalar(50), 0);
                }
            }
        }
    }
};

// Create one with dimensions/rounded corners based on the skp
//
// TODO(scroggo): Disabled in an attempt to rememdy
// https://code.google.com/p/skia/issues/detail?id=1801 ('Win7 Test bots all failing GenerateGMs:
// ran wrong number of tests')
//DEF_GM(return new BlurRoundRectGM(600, 5514, 6);)

DEF_GM(return new SimpleBlurRoundRectGM();)