IssueTracker

The project I work on contains sizable number of PNG assets. I noticed that it is possible for aapt to increase the size of PNGs which are packed in  apk (by examining apk as a zip archive) after I squished the images, but didn't see the difference in compiled apk size.

I created a small project to repro (see attached) and while the size increased just by a little bit there for the project I work on the difference is about 0.5M in total for all images (which is about 10% of all image size).

Looks like this should be a simple check for image growth in aapt/Images.cpp, preProcessImage function, which would keep the image untouched if the compressed size is larger than original size.

Repro:
1. build an attached project (zip actually includes the build I used)
2. get apk (I used TestAapt/app/build/outputs/apk/app-debug.apk) and unzip it
3. look at the size of an image in xhdpi folder:

ls -l TestAapt/app/build/outputs/apk/zip/res/drawable-xhdpi-v4/
-rw-r----- 1 14068 Jul 31 10:14 ic_launcher.png

4. compare with the PNG in res folder of an app:

ls -l TestAapt/app/src/main/res/drawable-xhdpi
-rw-r----- 1 14043 Jul 31 10:07 ic_launcher.png

Expected: size in apk same or smaller than in res/ folder
Observed: 14068 > 14043

Again, the difference is small for this particular image, but is much bigger (and adds up) for larger projects.