Bindings requests about skija

[tonsky]

Ok thanks, I’ll get back to it approx in two weeks, after some vacation time :)

[tonsky]

Right now we publish jar with native macOS dylib at https://bintray.com/beta/#/jetbrains/skija/skija?tab=overview. If you are on a mac, you can depend on those. Those are published per every commit. E.g. 0.4.35 contains your request on gradient points and saveLayer with Rect.

In the future we are going to split single jar into separate skija and skija-natives-mac and introduce other platforms.

[tonsky]

Re: drawOnPath. It seems that it was at one point in Skia, but has been removed since. The solution would be to reimplement it with the existing primitives.

[tonsky]

Ok, I have now pushed all the necessary primitives to implement text on path. Since it is no longer in Skia, I am not putting dedicated textOnPath method into Skija, but it is simple enough to implement. Please take a look:

skija/examples/lwjgl/src/main/java/org/jetbrains/skija/examples/lwjgl/TextBlobScene.java

Lines 64 to 97 in dfa6084

	public void drawRSXform(Canvas canvas) {
	short[] glyphs = font.getStringGlyphIds("Circular Text");
	float[] widths = font.getWidths(glyphs);
	RSXform[] xforms = new RSXform[glyphs.length];
	float radius = 50;
	int period = 3000;
	try (Path path = new Path().addCircle(0, 0, radius);
	PathMeasure measure = new PathMeasure(path);
	Paint fill = new Paint().setColor(0xffffba08);
	Paint stroke = new Paint().setColor(0xff3a86ff).setMode(PaintMode.STROKE).setStrokeWidth(1f);)
	{
	float length = measure.getLength();
	float relativeOffset = System.currentTimeMillis() % period / (float) period;
	float distance = relativeOffset * length;
	for (int i=0; i < xforms.length; ++i) {
	float w = widths[i];
	distance += w / 2;
	while (distance > length)
	distance -= length;
	Point p = measure.getPosition(distance);
	Point t = measure.getTangent(distance);
	xforms[i] = new RSXform(t.getX(), t.getY(), p.getX() - w / 2f * t.getX(), p.getY() - w / 2f * t.getY());
	distance += w / 2;
	}
	canvas.save();
	canvas.translate(radius + gap, radius + gap);
	canvas.drawPath(path, stroke);
	canvas.drawTextBlob(TextBlob.makeFromRSXform(glyphs, xforms, font), 0, 0, font, fill);
	canvas.restore();
	}

This is what I am getting:

[tonsky]

Oh, and the repo changed to. We now host it in JetBrains Space https://packages.jetbrains.team/maven/p/skija/maven instead of bintray.

[tonsky]

Hi @Solido, I have couple of questions:

Canvas drawTextOnPath

Canvas does not seem to have drawTextOnPath. Seems like it could be implemented with PathMeasure (which I just added) and TextBlob::MakeFromRSXform (which I will add soon) should be enough. Unless I am missing something?

color4f OK on gradient but UnsatisfiedLinkError on Paint

Seems to work in my example:

skija/examples/lwjgl/src/main/java/org/jetbrains/skija/examples/lwjgl/ShadersScene.java

Lines 16 to 55 in b0ae840

	private void drawColors(Canvas canvas) {
	canvas.save();
	try (Paint fill = new Paint()) {
	fill.setColor(0xFFFF0000);
	canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
	fill.setColor(0xFF00FF00);
	canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
	fill.setColor(0xFF0000FF);
	canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
	canvas.translate(70, 0);
	fill.setColor4f(new Color4f(1, 0, 0, 1));
	canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
	fill.setColor4f(new Color4f(0, 1, 0, 1));
	canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
	fill.setColor4f(new Color4f(0, 0, 1, 1));
	canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
	canvas.translate(70, 0);
	fill.setColor4f(new Color4f(1, 0, 0, 1), ColorSpace.getSRGB());
	canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
	fill.setColor4f(new Color4f(0, 1, 0, 1), ColorSpace.getSRGB());
	canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
	fill.setColor4f(new Color4f(0, 0, 1, 1), ColorSpace.getSRGB());
	canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
	canvas.translate(70, 0);
	fill.setColor4f(new Color4f(1, 0, 0, 1), ColorSpace.getDisplayP3());
	canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
	fill.setColor4f(new Color4f(0, 1, 0, 1), ColorSpace.getDisplayP3());
	canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
	fill.setColor4f(new Color4f(0, 0, 1, 1), ColorSpace.getDisplayP3());
	canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
	canvas.translate(70, 0);
	}
	canvas.restore();
	canvas.translate(0, 70);
	}

. Can you still reproduce it? Can you share a code example?

[Solido]

Hi @tonsky
Hope you had good holidays !

More info drawOnPath
https://skia.org/user/api/bmh_SkPath?cl=9919
mono/SkiaSharp#1183

If color4f works on your code then it's on my side !
Currently I compile libskija.dylib and put it in my resources folder.

For the lib I also to local maven then

api "org.jetbrains.skija:skija:0.0.0-local"
api "org.jetbrains.skija:skija:0.0.0-local-natives-mac-x64"

Done the full process but color4f is not even found while on the ide ...

How can I better follow your coming updates ?
Is it possible to have it linked by using a common maven repo ?

So far it's working great, Thanks

[Solido]

That was fast ! :D

[tonsky]

JFYI @Solido artifacts coordinates changed a little. Published versions now look like this:

org.jetbrains.skija:skija-macos:0.4.48

And local ones (installed via ./script/install.sh) are:

org.jetbrains.skija:skija-platform:0.0.0-SNAPSHOT

See README for more details.

[Solido]

Thanks @tonsky !
All updated with the new repo