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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkGradientShader.h"
#include "SkUtils.h"
#include "SkView.h"
static SkBitmap make_bitmap() {
SkPMColor c[256];
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(255 - i, 0, 0, 0);
}
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(c, 256);
bm.allocPixels(SkImageInfo::Make(256, 256, kIndex_8_SkColorType,
kPremul_SkAlphaType),
nullptr, ctable);
ctable->unref();
bm.lockPixels();
const float cx = bm.width() * 0.5f;
const float cy = bm.height() * 0.5f;
for (int y = 0; y < bm.height(); y++) {
float dy = y - cy;
dy *= dy;
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
float dx = x - cx;
dx *= dx;
float d = (dx + dy) / (cx/2);
int id = (int)d;
if (id > 255) {
id = 255;
}
p[x] = id;
}
}
bm.unlockPixels();
return bm;
}
class BlurView : public SampleView {
SkBitmap fBM;
public:
BlurView() {
if (false) { // avoid bit rot, suppress warning
fBM = make_bitmap();
}
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Blur");
return true;
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFFDDDDDD);
}
virtual void onDrawContent(SkCanvas* canvas) {
drawBG(canvas);
SkBlurStyle NONE = SkBlurStyle(-999);
static 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.setTextSize(25);
canvas->translate(-40, 0);
SkBlurMaskFilter::BlurFlags flags = SkBlurMaskFilter::kNone_BlurFlag;
for (int j = 0; j < 2; j++) {
canvas->save();
paint.setColor(SK_ColorBLUE);
for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++) {
if (gRecs[i].fStyle != NONE) {
paint.setMaskFilter(SkBlurMaskFilter::Make(gRecs[i].fStyle,
SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(20)),
flags));
} else {
paint.setMaskFilter(nullptr);
}
canvas->drawCircle(200 + gRecs[i].fCx*100.f,
200 + gRecs[i].fCy*100.f, 50, paint);
}
// draw text
{
paint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(4),
flags));
SkScalar x = SkIntToScalar(70);
SkScalar y = SkIntToScalar(400);
paint.setColor(SK_ColorBLACK);
canvas->drawText("Hamburgefons Style", 18, x, y, paint);
canvas->drawText("Hamburgefons Style", 18, x, y + SkIntToScalar(50), paint);
paint.setMaskFilter(nullptr);
paint.setColor(SK_ColorWHITE);
x -= SkIntToScalar(2);
y -= SkIntToScalar(2);
canvas->drawText("Hamburgefons Style", 18, x, y, paint);
}
canvas->restore();
flags = SkBlurMaskFilter::kHighQuality_BlurFlag;
canvas->translate(350, 0);
}
}
private:
typedef SkView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new BlurView; }
static SkViewRegister reg(MyFactory);
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