NVello.Gpu 0.11.0-main.22e4dabe

NVello

NVello is a C# binding for Vello.

Usage

using NVello;

using var renderer = new Renderer(256, 256);

renderer.Paint = new GradientPaint(Gradient.Linear(new(0, 0), new(256, 256),
    (0f, Color.FromRgb(0x1E294B)), (1f, Color.FromRgb(0xFF5D8F))));
renderer.FillRect(new Rect(0, 0, 256, 256));

renderer.Paint = Color.White.WithAlpha(0.8f);
renderer.FillPath(new NVello.Path().AddCircle(new Point(128, 128), 80));

renderer.Stroke = new Stroke(4).WithDashes(0, 12, 6);
renderer.Paint = Color.Black;
renderer.StrokeRect(new Rect(32, 32, 224, 224));

using var pixmap = new Pixmap(256, 256);
renderer.Render(pixmap);           // premultiplied RGBA8, pixmap.DataSpan
pixmap.SavePng("out.png");

// Or straight into your own buffer (width * height * 4 bytes).
var buffer = new byte[256 * 256 * 4];
renderer.Render(buffer, 256, 256);

Layers, masks, images, and text:

renderer.PushClipLayer(new NVello.Path().AddRoundedRect(new Rect(16, 16, 240, 240), 24));
renderer.PushBlendLayer(BlendMode.Multiply);
// ... draw ...
renderer.PopLayer();
renderer.PopLayer();

using var image = Pixmap.FromPngFile("texture.png");
var id = renderer.RegisterImage(image);
renderer.Paint = new ImagePaint(id, new ImageSampler(Extend.Repeat));

using var font = Font.FromFile("Roboto-Regular.ttf");
renderer.FillGlyphs(font, glyphs, new GlyphRunOptions(FontSize: 24));

renderer.PushFilterLayer(Filter.DropShadow(8, 8, 6, Color.Black.WithAlpha(0.5f)));
// ... draw ...
renderer.PopLayer();
renderer.FilterEffect = Filter.Blur(2);   // per subsequent draw; null clears

NVello.Gpu

using NVello;
using NVello.Gpu;

using var device = new GpuDevice();
using var scene = new GpuScene(512, 512);
using var renderer = new GpuRenderer(device, GpuTextureFormat.Rgba8Unorm);
using var target = new GpuTexture(device, 512, 512);

scene.Paint = Color.FromRgb(0x1E294B);
scene.PushFilterLayer(Filter.DropShadow(8, 8, 6, Color.Black.WithAlpha(0.5f)));
scene.Paint = Color.White;
scene.FillPath(new NVello.Path().AddCircle(new Point(256, 256), 120));
scene.PopLayer();

renderer.Render(scene, target);
using var pixmap = target.ReadToPixmap();
pixmap.SavePng("gpu.png");

var handle = SurfaceHandle.Xlib(display, windowId);       // or .Wayland(display, surface)
using var device = new GpuDevice(new() { CompatibleSurface = handle });
using var surface = new GpuSurface(device, handle, width, height);
using var renderer = surface.CreateRenderer();
using var scene = new GpuScene(width, height);
// per frame
scene.Reset();
Draw(scene);
surface.Present(renderer, scene);
// on resize
surface.Configure(newWidth, newHeight);
scene.ResetAndResize(newWidth, newHeight);

NVello.Pixman

using NVello.Pixman;
using Pixman;

using var canvas = PixmanImage.CreateBits(PixmanInterop.Format, 512, 512);
renderer.Render(canvas);                 // vello writes into pixman's memory
using var wrapped = pixmap.AsPixmanImage(); // pixman reads a vello pixmap in place