2000x slower drawImage

[gc]

drawImage appears to be 2000x slower than other canvas libraries.

The benchmark is drawing lots of parts of a big image (i.e sprites/spritesheets)

NAPI Canvas Average: 2413.62 ms, Min: 2338.18 ms, Max: 2525.64 ms
Node Canvas Average: 0.69 ms, Min: 0.58 ms, Max: 1.05 ms
Skia Canvas Average: 0.72 ms, Min: 0.52 ms, Max: 1.40 ms

Benchmark code https://github.com/gc/canvas-drawimage-benchmark

git clone https://github.com/gc/canvas-drawimage-benchmark.git
cd // yarn // npm install
node index.js

[rambo-panda]

I temporarily added a console.time, and it shows that @napi-rs/canvas takes a long time on drawImage. I suspect it is related to the pixel copying used in drawImage.

[rambo-panda]

In the comparison of the three, the time consumption of drawImage differs the most, with nap-rs/canvas taking as long as 3 seconds. I suspect that the synchronous method is causing "queueing" in the main process.

[gc]

@Brooooooklyn Are you able to publish a new version so I can test? or is there a way I can test without a new version. thanks

[gc]

A big improvement. Thank you

NAPI Canvas Average: 10.68 ms, Min: 8.92 ms, Max: 20.96 ms
Node Canvas Average: 6.31 ms, Min: 5.30 ms, Max: 11.60 ms
Skia Canvas Average: 1.54 ms, Min: 1.35 ms, Max: 19.92 ms

[rambo-panda]

@gc @Brooooooklyn
I found a serious risk of memory leakage during testing.

[129175840.177388] Killed process 11372 (node) total-vm:10889092kB, anon-rss:8374996kB, file-rss:28316kB, shmem-rss:0kB

this is my global env variable NODE_OPTIONS=--max-old-space-size=8192

The memory hasn't been released for a long time, even though I regularly execute clearAllCache or global.gc().