#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.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"

Classes
class	skiagm::HairModesGM

Namespaces
namespace	skiagm

Functions
static SkScalar	drawCell (SkCanvas *canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1)

static sk_sp< SkShader >	make_bg_shader ()

Variables
constexpr SkBlendMode	gModes []

const int	gWidth = 64

const int	gHeight = 64

const SkScalar	W = SkIntToScalar(gWidth)

const SkScalar	H = SkIntToScalar(gHeight)

Function Documentation

◆ drawCell()

static SkScalar drawCell	(	SkCanvas *	canvas,
		SkBlendMode	mode,
		SkAlpha	a0,
		SkAlpha	a1
	)

static

Definition at line 45 of file hairmodes.cpp.

                                                                                     {
 
    SkPaint paint;
    paint.setAntiAlias(true);
 
    SkRect r = SkRect::MakeWH(W, H);
    r.inset(W/10, H/10);
 
    paint.setColor(SK_ColorBLUE);
    paint.setAlpha(a0);
    canvas->drawOval(r, paint);
 
    paint.setColor(SK_ColorRED);
    paint.setAlpha(a1);
    paint.setBlendMode(mode);
    for (int angle = 0; angle < 24; ++angle) {
        SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
        SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
        paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
        canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
    }
 
    return H;
}

◆ make_bg_shader()

static sk_sp< SkShader > make_bg_shader ( )

static

Definition at line 70 of file hairmodes.cpp.

                                        {
    SkBitmap bm;
    bm.allocN32Pixels(2, 2);
    *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
    *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE, 0xCF, 0xCE);
 
    SkMatrix m;
    m.setScale(SkIntToScalar(6), SkIntToScalar(6));
    return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions(), m);
}

Variable Documentation

◆ gHeight

const int gHeight = 64

Definition at line 41 of file hairmodes.cpp.

◆ gModes

constexpr SkBlendMode gModes[]

constexpr

Initial value:

= {
    SkBlendMode::kClear,
    SkBlendMode::kSrc,
    SkBlendMode::kDst,
    SkBlendMode::kSrcOver,
    SkBlendMode::kDstOver,
    SkBlendMode::kSrcIn,
    SkBlendMode::kDstIn,
    SkBlendMode::kSrcOut,
    SkBlendMode::kDstOut,
    SkBlendMode::kSrcATop,
    SkBlendMode::kDstATop,
    SkBlendMode::kXor,
}