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flutter_flutter/engine
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Jonah Williams 7e99b7f8b3
[Impeller] let drawImage nine use porter duff optimization. (#169611) 
Fixes https://github.com/flutter/flutter/issues/169492

Currently we apply a color filter nine times for the drawImageNine
calls, which is very expensive. We can do the same porterduff
optimization we did for flame for drawImage nine by allowing the porter
duff shader to specify a strict src rect.

### Before


![flutter_04](https://github.com/user-attachments/assets/006c89ad-14a6-4387-9bfb-f6be357f43d6)

### After


![flutter_03](https://github.com/user-attachments/assets/e058d86e-7f1a-4708-bb40-8746bb9199e4)
2025-05-29 22:08:29 +00:00
..
scripts
…
src
[Impeller] let drawImage nine use porter duff optimization. (#169611)
2025-05-29 22:08:29 +00:00
README.md
Add to Setup Path Example to Engine README (#162115)
2025-01-24 05:14:38 +00:00

README.md

Flutter Engine

Setting up the Engine development environment

See here

gclient bootstrap

Flutter engine uses gclient to manage dependencies.

If you've already cloned the flutter repository:

  1. Copy one of the engine/scripts/*.gclient to the root folder as .gclient:
    1. Googlers: copy rbe.gclient to enable faster builds with RBE
    2. Everyone else: copy standard.gclient
  2. run gclient sync from the root folder