clip_sierpinski_region.cpp File Reference

#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRegion.h"

Go to the source code of this file.

Functions
	DEF_SIMPLE_GM (clip_sierpinski_region, canvas, 2 *kTrans+kSize, 2 *kTrans+kSize)

Variables
static constexpr int	kSize = 3*3*3*3*3
static constexpr int	kTrans = 10

Function Documentation

DEF_SIMPLE_GM()

DEF_SIMPLE_GM	(	clip_sierpinski_region	,
		canvas	,
		2 *kTrans+	kSize,
		2 *kTrans+	kSize
	)

Definition at line 17 of file clip_sierpinski_region.cpp.

                                                                                  {
    SkRegion region;
    static constexpr int kSteps = 4;
    int n = 1;
    SkScalar s = kSize/3.f;
    for (int i = 0; i < kSteps; ++i, n*=3, s/=3.f) {
        for (int x = 0; x < n; ++x) {
            for (int y = 0; y < n; ++y) {
                region.op(SkIRect::MakeXYWH((3*x + 1)*s, (3*y + 1)*s, s, s), SkRegion::kUnion_Op);
            }
        }
    }
    // Test that a save layer with an offset works as expected.
    region.translate(kTrans, kTrans);
    canvas->saveLayer(SkRect::MakeXYWH(kTrans, kTrans, 1000, 1000), nullptr);
    // Make sure the clip call ignores the CTM.
    canvas->rotate(25.f, 50.f, 50.f);
    canvas->clipRegion(region);
    SkPaint red;
    red.setColor(SK_ColorRED);
    canvas->drawPaint(red);
    canvas->restore();
}

Variable Documentation

kSize

constexpr int kSize = 3*3*3*3*3

staticconstexpr

Definition at line 14 of file clip_sierpinski_region.cpp.

kTrans

constexpr int kTrans = 10

staticconstexpr

Definition at line 15 of file clip_sierpinski_region.cpp.