1、外阴影
外阴影Path：根据图形Path偏移量offsetX，offsetY获得；
描边外阴影，图片的透明没有阴影；
外阴影Paint : 高斯模糊值sigmaX，sigmaY， 填充颜色值
sigmaX,sigmaY，前端过来数据以后有2倍关系；？
透明度为0，外阴影没有；
link : https : //fiddle.skia.org/c/c64f77aa06a1634ef2f6833248e5bf86
void draw(SkCanvas *canvas){
//基础数据
const int offsetX = 10;
const int offsetY = 10;
const int sigmaX = 10;
const int sigmaY = 10;
SkPoint rectPts[] = {{64, 48}, {192, 160}};
SkRect rect;
rect.set(rectPts[0], rectPts[1]);
SkPath path;
path.addRect(rect);
//-----------------------------------------
//外阴影绘制
SkPath dropShadowPath = path;
SkPaint dropShadowPaint;
dropShadowPaint.setAntiAlias(true);
dropShadowPaint.setStyle(SkPaint::kStrokeAndFill_Style);
dropShadowPaint.setColor(SK_ColorBLUE);
dropShadowPaint.setImageFilter(SkImageFilters::Blur(sigmaX, sigmaY, nullptr, nullptr));
SkMatrix mat;
mat.postTranslate(offsetX, offsetY);
dropShadowPath.transform(mat);
canvas->drawPath(dropShadowPath, dropShadowPaint);
//---------------------------------------
//原始图形绘制
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setColor(SK_ColorRED);
canvas->drawPath(path, paint);
//---------------------------------------
}
外阴影效果
2.内阴影
内阴影Path：根据图形Path偏移量offsetX，offsetY获得一个偏移Path2，然后Path与Path2做kDifference_Op运算，求得内阴影innerShadowPath；
内阴影Paint : 高斯模糊值sigmaX，sigmaY， 填充颜色值；
link : https : //fiddle.skia.org/c/17b7d8076d7ef84c0f1a0fa494259388
void draw(SkCanvas *canvas){
//基础数据
const int offsetX = 10;
const int offsetY = 10;
const int sigmaX = 10;
const int sigmaY = 10;
const int gaussianSigma = 200;
SkPoint rectPts[] = {{64, 48}, {192, 160}};
SkRect rect;
rect.set(rectPts[0], rectPts[1]);
SkPath path;
path.addRect(rect);
//-----------------------------------------
canvas->clipPath(path, true);
//原始图形绘制
SkPictureRecorder recorder;
SkCanvas *recordingCanvas = recorder.beginRecording(rect);
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setColor(SK_ColorRED);
recordingCanvas->drawPath(path, paint);
sk_sp<SkPicture> playback = recorder.finishRecordingAsPicture();
canvas->drawPicture(playback);
//---------------------------------------
//内阴影绘制
SkPath offsetPath = path;
SkMatrix mat;
mat.postTranslate(offsetX, offsetY);
offsetPath.transform(mat);
SkPath innerShadowPath;
{
//OP(path, offsetPath, SkPathOp::kDifference_SkPathOp, &innerShadowPath);
SkRegion region;
SkRect pathBounds = path.computeTightBounds();
SkIRect iRect = SkIRect::MakeLTRB(pathBounds.fLeft, pathBounds.fTop, pathBounds.fRight,
pathBounds.fBottom);
SkRegion shapeRegion(iRect);
region.setPath(path, shapeRegion);
SkRegion _region;
SkRect pathBounds2 = offsetPath.computeTightBounds();
SkIRect iRect2 = SkIRect::MakeLTRB(pathBounds2.fLeft, pathBounds2.fTop, pathBounds2.fRight,
pathBounds2.fBottom);
SkRegion shapeRegion2(iRect2);
bool flag = _region.setPath(offsetPath, shapeRegion2);
region.op(_region, SkRegion::Op::kDifference_Op);
region.getBoundaryPath(&innerShadowPath);
}
SkPaint innerShadowPaint;
innerShadowPaint.setAntiAlias(true);
innerShadowPaint.setStyle(SkPaint::kStrokeAndFill_Style);
innerShadowPaint.setColor(SK_ColorBLUE);
innerShadowPaint.setImageFilter(SkImageFilters::Blur(sigmaX, sigmaY, nullptr, nullptr));
canvas->drawPath(innerShadowPath, innerShadowPaint);
//---------------------------------------
}
内阴影效果
3.高斯模糊
高斯模糊SkPicture：录制当前图层的Picture；
高斯模糊Paint : 高斯模糊值sigmaX，sigmaY；
link : https : //fiddle.skia.org/c/a62c64dc9afedeb0f5cf13bdebf68fdf
void draw(SkCanvas *canvas){
//基础数据
const int offsetX = 10;
const int offsetY = 10;
const int sigmaX = 10;
const int sigmaY = 10;
SkPoint rectPts[] = {{64, 48}, {192, 160}};
SkRect rect;
rect.set(rectPts[0], rectPts[1]);
SkPath path;
path.addRect(rect);
//-----------------------------------------
//原始图形绘制
SkPictureRecorder recorder;
SkCanvas *recordingCanvas = recorder.beginRecording(rect);
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setColor(SK_ColorRED);
recordingCanvas->drawPath(path, paint);
paint.setColor(SK_ColorBLUE);
SkMatrix mat;
mat.postTranslate(20, 20);
path.transform(mat);
recordingCanvas->drawPath(path, paint);
sk_sp<SkPicture> playback = recorder.finishRecordingAsPicture();
//---------------------------------------
//图层绘制
SkPaint layerPaint;
layerPaint.setAntiAlias(true);
layerPaint.setStyle(SkPaint::kStrokeAndFill_Style);
//layerPaint.setColor(SK_ColorBLUE);
layerPaint.setImageFilter(SkImageFilters::Blur(sigmaX, sigmaY, nullptr, nullptr));
canvas->drawPicture(playback, nullptr, &layerPaint);
//---------------------------------------
}
高斯模糊效果
4.背景模糊
依赖参数
图层的穿透混合模式
背景模糊SkPicture：录制当前图层的Picture；
背景模糊Paint: 高斯模糊值gaussianSigma；
背景模糊的透明度：Alpha；
link:https://fiddle.skia.org/c/68d1cf656fc6473146e7cb5d80426365
void draw(SkCanvas *canvas){
//基础数据
const int offsetX = 10;
const int offsetY = 10;
const int gaussianSigma = 200;
SkPoint rectPts[] = {{64, 48}, {192, 160}};
SkRect rect;
rect.set(rectPts[0], rectPts[1]);
SkPath path;
path.addRect(rect);
//底图绘制---------------------------------
{
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setColor(SK_ColorYELLOW);
canvas->drawCircle(100, 120, 30, paint);
}
//-----------------------------------------
//原始图形绘制
SkPictureRecorder recorder;
SkCanvas *recordingCanvas = recorder.beginRecording(rect);
SkPaint paint;
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setColor(SK_ColorRED);
recordingCanvas->drawPath(path, paint);
sk_sp<SkPicture> playback = recorder.finishRecordingAsPicture();
//---------------------------------------
//图层绘制
SkPaint layerPaint;
layerPaint.setAlpha(255 * 0.4);
//SkMaskFilter: https://fiddle.skia.org/c/a92b2945009a7d5045248a4fc24122f9
layerPaint.setMaskFilter(SkMaskFilter::MakeBlur(kInner_SkBlurStyle, gaussianSigma));
canvas->drawPicture(playback, nullptr, &layerPaint);
//---------------------------------------
}
背景模糊效果
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