Generate the recovery text images at build time

We used to manually generate the background text images for recovery. That
process requires opening various emulators and takes a long time. Now that
the host Java tool is ready to generate these images, we can embed the
generation step into the build of the recovery image.

Since there's currently no make variable that defines screen width of the
device, we put the commonly used values for pixels here, i.e. 1440 for
xxxhdpi and 1080 for xxhdpi. Devices with other dpi can still use this
feature if they define the screen width in their config files.

Test: build bootimage with screen with set/unset
Change-Id: Ic8389a527e6e7194de58a9c50763e841e886652b
1 file changed
tree: 1715f11d817f7d3ee553aefab0ddb20dfba038bc
  1. common/
  2. core/
  3. packaging/
  4. target/
  5. tests/
  6. tools/
  7. .gitignore
  8. Android.mk
  9. buildspec.mk.default
  10. Changes.md
  11. CleanSpec.mk
  12. envsetup.sh
  13. help.sh
  14. navbar.md
  15. OWNERS
  16. README.md
  17. tapasHelp.sh
  18. Usage.txt
README.md

Android Make Build System

This is the Makefile-based portion of the Android Build System.

For documentation on how to run a build, see Usage.txt

For a list of behavioral changes useful for Android.mk writers see Changes.md

For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.

This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.