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import type { FrameRate } from "opencut-wasm";
import type { AnyBaseNode } from "./nodes/base-node";
import { createCanvasSurface } from "./canvas-utils";
import { buildFrameDescriptor } from "./compositor/frame-descriptor";
import { wasmCompositor } from "./compositor/wasm-compositor";
import { resolveRenderTree } from "./resolve";
import {
measureSpanAsync,
measureSpanSync,
onRenderPerfFrameComplete,
} from "@/diagnostics/render-perf";
export type CanvasRendererParams = {
width: number;
height: number;
fps: FrameRate;
};
export class CanvasRenderer {
canvas: OffscreenCanvas;
context: OffscreenCanvasRenderingContext2D;
width: number;
height: number;
fps: FrameRate;
constructor({ width, height, fps }: CanvasRendererParams) {
this.width = width;
this.height = height;
this.fps = fps;
const surface = createCanvasSurface({ width, height });
this.canvas = surface.canvas;
this.context = surface.context;
}
getOutputCanvas(): HTMLCanvasElement {
wasmCompositor.ensureInitialized({
width: this.width,
height: this.height,
});
return wasmCompositor.getCanvas();
}
setSize({ width, height }: { width: number; height: number }) {
this.width = width;
this.height = height;
const surface = createCanvasSurface({ width, height });
this.canvas = surface.canvas;
this.context = surface.context;
}
async render({ node, time }: { node: AnyBaseNode; time: number }) {
await measureSpanAsync({
name: "resolve",
fn: () => resolveRenderTree({ node, renderer: this, time }),
});
const { frame, textures } = await measureSpanAsync({
name: "buildFrame",
fn: () => buildFrameDescriptor({ node, renderer: this }),
});
wasmCompositor.ensureInitialized({
width: this.width,
height: this.height,
});
measureSpanSync({
name: "syncTextures",
fn: () => wasmCompositor.syncTextures(textures),
});
measureSpanSync({
name: "renderFrame",
fn: () => wasmCompositor.render(frame),
});
}
async renderToCanvas({
node,
time,
targetCanvas,
}: {
node: AnyBaseNode;
time: number;
targetCanvas: HTMLCanvasElement;
}) {
await this.render({ node, time });
const ctx = targetCanvas.getContext("2d");
if (!ctx) {
throw new Error("Failed to get target canvas context");
}
measureSpanSync({
name: "drawImage",
fn: () =>
ctx.drawImage(
wasmCompositor.getCanvas(),
0,
0,
targetCanvas.width,
targetCanvas.height,
),
});
onRenderPerfFrameComplete();
}
}
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