blurs.cpp File Reference

#include "gm/gm.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkFont.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPathBuilder.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkImageFilters.h"
#include "src/core/SkBlurMask.h"
#include "tools/DecodeUtils.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"

Go to the source code of this file.

Functions
	DEF_SIMPLE_GM_BG (blurs, canvas, 700, 500, 0xFFDDDDDD)
	DEF_SIMPLE_GM (blur2rects, canvas, 700, 500)
	DEF_SIMPLE_GM (blur2rectsnonninepatch, canvas, 700, 500)
	DEF_SIMPLE_GM (BlurDrawImage, canvas, 256, 256)
	DEF_SIMPLE_GM (BlurBigSigma, canvas, 1024, 1024)
	DEF_SIMPLE_GM (BlurSmallSigma, canvas, 512, 256)
	DEF_SIMPLE_GM (TiledBlurBigSigma, canvas, 1024, 768)

Function Documentation

DEF_SIMPLE_GM() [1/6]

DEF_SIMPLE_GM	(	blur2rects	,
		canvas	,
		700	,
		500
	)

Definition at line 87 of file blurs.cpp.

                                            {
    SkPaint paint;
 
    paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 2.3f));
 
    SkRect outer = SkRect::MakeXYWH(10.125f, 10.125f, 100.125f, 100);
    SkRect inner = SkRect::MakeXYWH(20.25f, 20.125f, 80, 80);
    SkPath path = SkPathBuilder().addRect(outer, SkPathDirection::kCW)
                                 .addRect(inner, SkPathDirection::kCCW)
                                 .detach();
 
    canvas->drawPath(path, paint);
    // important to translate by a factional amount to exercise a different "phase"
    // of the same path w.r.t. the pixel grid
    SkScalar dx = SkScalarRoundToScalar(path.getBounds().width()) + 14 + 0.25f;
    canvas->translate(dx, 0);
    canvas->drawPath(path, paint);
}

DEF_SIMPLE_GM() [2/6]

DEF_SIMPLE_GM	(	blur2rectsnonninepatch	,
		canvas	,
		700	,
		500
	)

Definition at line 106 of file blurs.cpp.

                                                        {
    SkPaint paint;
    paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 4.3f));
 
    SkRect outer = SkRect::MakeXYWH(10, 110, 100, 100);
    SkRect inner = SkRect::MakeXYWH(50, 150, 10, 10);
    SkPath path = SkPathBuilder().addRect(outer, SkPathDirection::kCW)
                                 .addRect(inner, SkPathDirection::kCW)
                                 .detach();
    canvas->drawPath(path, paint);
 
    SkScalar dx = SkScalarRoundToScalar(path.getBounds().width()) + 40 + 0.25f;
    canvas->translate(dx, 0);
    canvas->drawPath(path, paint);
 
    // Translate to outside of clip bounds.
    canvas->translate(-dx, 0);
    canvas->translate(-30, -150);
    canvas->drawPath(path, paint);
}

DEF_SIMPLE_GM() [3/6]

DEF_SIMPLE_GM	(	BlurBigSigma	,
		canvas	,
		1024	,
		1024
	)

Definition at line 137 of file blurs.cpp.

                                                {
    SkPaint layerPaint, p;
 
    p.setImageFilter(SkImageFilters::Blur(500, 500, nullptr));
 
    canvas->drawRect(SkRect::MakeWH(700, 800), p);
}

DEF_SIMPLE_GM() [4/6]

DEF_SIMPLE_GM	(	BlurDrawImage	,
		canvas	,
		256	,
		256
	)

Definition at line 127 of file blurs.cpp.

                                               {
    SkPaint paint;
    paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 10));
    canvas->clear(0xFF88FF88);
    if (auto image = ToolUtils::GetResourceAsImage("images/mandrill_512_q075.jpg")) {
        canvas->scale(0.25, 0.25);
        canvas->drawImage(image, 256, 256, SkSamplingOptions(), &paint);
    }
}

DEF_SIMPLE_GM() [5/6]

DEF_SIMPLE_GM	(	BlurSmallSigma	,
		canvas	,
		512	,
		256
	)

Definition at line 145 of file blurs.cpp.

                                                {
    {
        // Normal sigma on x-axis, a small but non-zero sigma on y-axis that should
        // be treated as identity.
        SkPaint paint;
        paint.setImageFilter(SkImageFilters::Blur(16.f, 1e-5f, nullptr));
        canvas->drawRect(SkRect::MakeLTRB(64, 64, 192, 192), paint);
    }
 
    {
        // Small sigma on both axes, should be treated as identity and no red should show
        SkPaint paint;
        paint.setColor(SK_ColorRED);
        SkRect rect = SkRect::MakeLTRB(320, 64, 448, 192);
        canvas->drawRect(rect, paint);
        paint.setColor(SK_ColorBLACK);
        paint.setImageFilter(SkImageFilters::Blur(1e-5f, 1e-5f, nullptr));
        canvas->drawRect(rect, paint);
    }
}

DEF_SIMPLE_GM() [6/6]

DEF_SIMPLE_GM	(	TiledBlurBigSigma	,
		canvas	,
		1024	,
		768
	)

Definition at line 168 of file blurs.cpp.

                                                    {
    static constexpr int kTileWidth = 342;
    static constexpr int kTileHeight = 256;
 
    SkM44 origCTM = canvas->getLocalToDevice();
 
    for (int y = 0; y < 3; ++y) {
        for (int x = 0; x < 3; ++x) {
            // Define tiled grid in the canvas pixel space
            canvas->save();
                canvas->resetMatrix();
 
                canvas->clipIRect(SkIRect::MakeXYWH(x*kTileWidth, y*kTileHeight,
                                                    kTileWidth, kTileHeight));
                canvas->setMatrix(origCTM);
 
                auto flood = SkImageFilters::ColorFilter(SkColorFilters::Blend(
                        SK_ColorBLACK, SkBlendMode::kSrc), nullptr);
                auto blend = SkImageFilters::Blend(SkBlendMode::kSrcOver,
                                                   std::move(flood), nullptr);
                auto blur = SkImageFilters::Blur(206.f, 206.f, std::move(blend));
 
                SkPaint p;
                p.setImageFilter(std::move(blur));
 
                canvas->clipRect({0, 0, 1970, 1223});
                canvas->saveLayer(nullptr, &p);
                    SkPaint fill;
                    fill.setColor(SK_ColorBLUE);
                    canvas->drawCircle(600, 150, 350, fill);
                canvas->restore();
            canvas->restore();
        }
    }
}

DEF_SIMPLE_GM_BG()

DEF_SIMPLE_GM_BG	(	blurs	,
		canvas	,
		700	,
		500	,
		0xFFDDDDDD
	)

Definition at line 29 of file blurs.cpp.

                                                      {
    SkBlurStyle NONE = SkBlurStyle(-999);
    const struct {
        SkBlurStyle fStyle;
        int         fCx, fCy;
    } gRecs[] = {
        { NONE,                 0,  0 },
        { kInner_SkBlurStyle,  -1,  0 },
        { kNormal_SkBlurStyle,  0,  1 },
        { kSolid_SkBlurStyle,   0, -1 },
        { kOuter_SkBlurStyle,   1,  0 },
    };
 
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setColor(SK_ColorBLUE);
 
    canvas->translate(SkIntToScalar(-40), SkIntToScalar(0));
 
    for (size_t i = 0; i < std::size(gRecs); i++) {
        if (gRecs[i].fStyle != NONE) {
            paint.setMaskFilter(SkMaskFilter::MakeBlur(gRecs[i].fStyle,
                                   SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(20))));
        } else {
            paint.setMaskFilter(nullptr);
        }
        canvas->drawCircle(SkIntToScalar(200 + gRecs[i].fCx*100),
                           SkIntToScalar(200 + gRecs[i].fCy*100),
                           SkIntToScalar(50),
                           paint);
    }
    // draw text
    {
        SkFont font(ToolUtils::DefaultPortableTypeface(), 25);
        paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
                                   SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(4))));
        SkScalar x = SkIntToScalar(70);
        SkScalar y = SkIntToScalar(400);
        paint.setColor(SK_ColorBLACK);
        canvas->drawString("Hamburgefons Style", x, y, font, paint);
        canvas->drawString("Hamburgefons Style",
                         x, y + SkIntToScalar(50), font, paint);
        paint.setMaskFilter(nullptr);
        paint.setColor(SK_ColorWHITE);
        x -= SkIntToScalar(2);
        y -= SkIntToScalar(2);
        canvas->drawString("Hamburgefons Style", x, y, font, paint);
    }
}