Function requestFrame

packages/node/src/backend/nodeBackendInline.ts:667–750

(drawlist: Uint8Array)

    },

    requestFrame(drawlist: Uint8Array): Promise<void> {
      if (disposed) return Promise.reject(new Error("NodeBackend(inline): disposed"));
      if (fatal !== null) return Promise.reject(fatal);
      if (stopRequested) return Promise.reject(new Error("NodeBackend(inline): stopped"));
      if (!started) {
        return backend.start().then(() => backend.requestFrame(drawlist));
      }
      if (native === null || engineId === null) {
        return Promise.reject(new Error("NodeBackend(inline): engine not started"));
      }

      try {
        const frameSeq = nextFrameSeq++;
        const fp = frameAudit.enabled ? drawlistFingerprint(drawlist) : null;
        maybeDumpDrawlistBytes("backend-inline", "requestFrame", frameSeq, drawlist);
        if (fp !== null) {
          frameAudit.emit("frame.submitted", {
            frameSeq,
            submitPath: "requestFrame",
            transport: "inline-v1",
            ...fp,
          });
          frameAudit.emit("frame.submit.payload", {
            frameSeq,
            transport: "inline-v1",
            ...fp,
          });
        }
        const submitRc = native.engineSubmitDrawlist(engineId, drawlist);
        if (frameAudit.enabled) {
          frameAudit.emit("frame.submit.result", {
            frameSeq,
            submitResult: submitRc,
          });
        }
        if (submitRc < 0) {
          if (frameAudit.enabled) {
            frameAudit.emit("frame.completed", {
              frameSeq,
              completedResult: submitRc,
            });
          }
          return Promise.reject(
            new ZrUiError(
              "ZRUI_BACKEND_ERROR",
              `engine_submit_drawlist failed: code=${String(submitRc)}`,
            ),
          );
        }
        if (frameAudit.enabled) {
          frameAudit.emit("frame.accepted", { frameSeq });
        }
        const presentRc = native.enginePresent(engineId);
        if (frameAudit.enabled) {
          frameAudit.emit("frame.present.result", {
            frameSeq,
            presentResult: presentRc,
          });