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opt: reduce copy and malloc times for both of flutter and rust

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Kingtous
2023-02-12 01:52:11 +08:00
parent f521b1665a
commit 01d30bce9e
7 changed files with 105 additions and 38 deletions
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30
flutter/lib/models/model.dart
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@@ -1,10 +1,12 @@
import 'dart:async';
import 'dart:convert';
import 'dart:ffi' hide Size;
import 'dart:io';
import 'dart:math';
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:ffi/ffi.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_hbb/consts.dart';
@@ -1367,6 +1369,9 @@ class FFI {
final stream = bind.sessionStart(id: id);
final cb = ffiModel.startEventListener(id);
() async {
// Preserved for the rgba data.
Pointer<Uint8>? buffer;
int? bufferSize;
await for (final message in stream) {
if (message is EventToUI_Event) {
try {
@@ -1377,13 +1382,30 @@ class FFI {
}
} else if (message is EventToUI_Rgba) {
// Fetch the image buffer from rust codes.
bind.sessionGetRgba(id: id).then((rgba) {
if (rgba != null) {
imageModel.onRgba(rgba);
final sz = platformFFI.getRgbaSize(id);
if (sz == null) {
return;
}
// The buffer does not exists or the bufferSize is not
// equal to the required size.
if (buffer == null || bufferSize != sz) {
// reallocate buffer
if (buffer != null) {
malloc.free(buffer);
}
});
buffer = malloc.allocate(sz);
bufferSize = sz;
}
final rgba = platformFFI.getRgba(id, buffer, bufferSize!);
if (rgba != null) {
imageModel.onRgba(rgba);
}
}
}
// Free the buffer allocated on the heap.
if (buffer != null) {
malloc.free(buffer);
}
}();
// every instance will bind a stream
this.id = id;