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Preventing image downscaling in the draw.io desktop app
By default, the draw.io app will shrink any image larger than 520 pixels wide. This is a problem when creating diagrams which need larger, pixel-perfect images.
If press the
Control key after starting to drag an image, draw.io will sometimes prompt if you'd like to resize or use the original image resolution:
The problem with this is:
- It doesn't consistently present the dialog (sometimes it just shrinks the image anyway)
- The "Remember this setting" appears to be completely broken
- Having to hold
Controlevery time to drag in a new image is a pain in the ass!
Download the latest version of the app here: https://github.com/jgraph/drawio-desktop/releases/
Note: because OS X verifies the integrity of applications upon first run, you need to run the app at least once before patching it, otherwise OS X will refuse to run the app:
Method 1: edit app.asar by hand
The file to edit is /Applications/draw.io.app/Contents/Resources/app.asar
In this file will be several copies of EditorUI.js, some of which are minified.
We want to change these constants:
Edit those constants to be a very large number:
Be sure to also edit all instances of those constants in the sections of minified js as well:
(Note: I initially tried to edit app.asar using VS Code, but it ended up blowing up the file by ~6MB (perhaps due to reformatting the minified JS blocks?). I instead edited the file using vim and all was well).
Method 2: change app.asar using a binary patch file
Rather than editing app.asar by hand, you can instead us the binary patch I've attached to this gist.
brew install bsdiff
cat app.asar.bsdiff.base64 | base64 --decode > app.asar.bsdiff
bspatch app.asar app.asar.new app.asar.bsdiff
mv app.asar.new app.asar
Hmm, in some cases it looks like it is still downscaling images anyway. Oh fiddle-sticks!