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153 行
5.9 KiB

using System.Collections.Generic;
using Unity.UIWidgets.async2;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.ui;
namespace Unity.UIWidgets.painting {
public abstract class ShaderWarmUp {
protected ShaderWarmUp() {
}
public virtual Size size => new Size(100.0f, 100.0f);
protected abstract Future warmUpOnCanvas(Canvas canvas);
public Future execute() {
PictureRecorder recorder = new PictureRecorder();
Canvas canvas = new Canvas(recorder);
return warmUpOnCanvas(canvas).then(_ => {
Picture picture = recorder.endRecording();
//TimelineTask shaderWarmUpTask = TimelineTask();
//shaderWarmUpTask.start('Warm-up shader');
picture.toImage(size.width.ceil(), size.height.ceil()).then(__ => {
//shaderWarmUpTask.finish();
return FutureOr.nil;
});
return FutureOr.nil;
});
}
}
public class DefaultShaderWarmUp : ShaderWarmUp {
public DefaultShaderWarmUp(
float drawCallSpacing = 0.0f,
Size canvasSize = null
) {
canvasSize = canvasSize ?? new Size(100.0f, 100.0f);
this.drawCallSpacing = drawCallSpacing;
this.canvasSize = canvasSize;
}
public readonly float drawCallSpacing;
public readonly Size canvasSize;
public override Size size => canvasSize;
/// Trigger common draw operations on a canvas to warm up GPU shader
/// compilation cache.
protected override Future warmUpOnCanvas(Canvas canvas) {
RRect rrect = RRect.fromLTRBXY(20.0f, 20.0f, 60.0f, 60.0f, 10.0f, 10.0f);
Path rrectPath = new Path();
rrectPath.addRRect(rrect);
Path circlePath = new Path();
circlePath.addOval(
Rect.fromCircle(center: new Offset(40.0f, 40.0f), radius: 20.0f)
);
// The following path is based on
// https://skia.org/user/api/SkCanvas_Reference#SkCanvas_drawPath
Path path = new Path();
path.moveTo(20.0f, 60.0f);
path.quadraticBezierTo(60.0f, 20.0f, 60.0f, 60.0f);
path.close();
path.moveTo(60.0f, 20.0f);
path.quadraticBezierTo(60.0f, 60.0f, 20.0f, 60.0f);
Path convexPath = new Path();
convexPath.moveTo(20.0f, 30.0f);
convexPath.lineTo(40.0f, 20.0f);
convexPath.lineTo(60.0f, 30.0f);
convexPath.lineTo(60.0f, 60.0f);
convexPath.lineTo(20.0f, 60.0f);
convexPath.close();
// Skia uses different shaders based on the kinds of paths being drawn and
// the associated paint configurations. According to our experience and
// tracing, drawing the following paths/paints generates various of
// shaders that are commonly used.
List<Path> paths = new List<Path> {rrectPath, circlePath, path, convexPath};
List<Paint> paints = new List<Paint> {
new Paint {
isAntiAlias = true,
style = PaintingStyle.fill
},
new Paint {
isAntiAlias = false,
style = PaintingStyle.fill
},
new Paint {
isAntiAlias = true,
style = PaintingStyle.stroke,
strokeWidth = 10
},
new Paint {
isAntiAlias = true,
style = PaintingStyle.stroke,
strokeWidth = 0.1f, // hairline
}
};
// Warm up path stroke and fill shaders.
for (int i = 0; i < paths.Count; i += 1) {
canvas.save();
foreach (var paint in paints) {
canvas.drawPath(paths[i], paint);
canvas.translate(drawCallSpacing, 0.0f);
}
canvas.restore();
canvas.translate(0.0f, drawCallSpacing);
}
// Warm up shadow shaders.
Color black = new Color(0xFF000000);
canvas.save();
canvas.drawShadow(rrectPath, black, 10.0f, true);
canvas.translate(drawCallSpacing, 0.0f);
canvas.drawShadow(rrectPath, black, 10.0f, false);
canvas.restore();
// Warm up text shaders.
canvas.translate(0.0f, drawCallSpacing);
// final ui.ParagraphBuilder paragraphBuilder = ui.ParagraphBuilder(
// ui.ParagraphStyle(textDirection: ui.TextDirection.ltr),
// )..pushStyle(ui.TextStyle(color: black))..addText('_');
// final ui.Paragraph paragraph = paragraphBuilder.build()
// ..layout(const ui.ParagraphConstraints (width: 60.0));
// canvas.drawParagraph(paragraph, const ui.Offset (20.0, 20.0));
// Draw a rect inside a rrect with a non-trivial intersection. If the
// intersection is trivial (e.g., equals the rrect clip), Skia will optimize
// the clip out.
//
// Add an integral or fractional translation to trigger Skia's non-AA or AA
// optimizations (as did before in normal FillRectOp in rrect clip cases).
foreach (var fraction in new[] {0.0f, 0.5f}) {
canvas.save();
canvas.translate(fraction, fraction);
canvas.clipRRect(RRect.fromLTRBR(8, 8, 328, 248, Radius.circular(16)));
canvas.drawRect(Rect.fromLTRB(10, 10, 320, 240), new Paint());
canvas.restore();
canvas.translate(drawCallSpacing, 0.0f);
}
canvas.translate(0.0f, drawCallSpacing);
return Future.value();
}
}
}