From 9a259772ccf1e9708baecc559323ac5b6229e954 Mon Sep 17 00:00:00 2001
From: Tianjie Xu <xunchang@google.com>
Date: Thu, 28 Jul 2016 14:15:00 -0700
Subject: Add docs on regeneration background text image

Also add a missing string in the recovery_l10n APP.

Bug: 30415666
Change-Id: Ice2a9f7cad4ebe332b427bc0c7a9adccb6cf3af3
---
 minui/minui.h                                      |  4 +--
 tools/recovery_l10n/README.md                      | 31 ++++++++++++++++++++++
 tools/recovery_l10n/res/values/strings.xml         |  1 +
 .../src/com/android/recovery_l10n/Main.java        |  1 +
 4 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 tools/recovery_l10n/README.md

diff --git a/minui/minui.h b/minui/minui.h
index b2648fb33..d572205f3 100644
--- a/minui/minui.h
+++ b/minui/minui.h
@@ -111,8 +111,8 @@ int res_create_alpha_surface(const char* name, GRSurface** pSurface);
 // given locale.  The image is expected to be a composite of multiple
 // translations of the same text, with special added rows that encode
 // the subimages' size and intended locale in the pixel data.  See
-// development/tools/recovery_l10n for an app that will generate these
-// specialized images from Android resources.
+// bootable/recovery/tools/recovery_l10n for an app that will generate
+// these specialized images from Android resources.
 int res_create_localized_alpha_surface(const char* name, const char* locale,
                                        GRSurface** pSurface);
 
diff --git a/tools/recovery_l10n/README.md b/tools/recovery_l10n/README.md
new file mode 100644
index 000000000..bf41ff241
--- /dev/null
+++ b/tools/recovery_l10n/README.md
@@ -0,0 +1,31 @@
+# Steps to regenerate background text images under res-*dpi/images/
+
+1.  Build the recovery_l10n app:
+
+    cd bootable/recovery && mma -j32
+
+2.  Install the app on the device (or emulator) with the intended dpi.
+
+    *   For example, we can use Nexus 5 to generate the text images under
+        res-xxhdpi.
+    *   When using the emulator, make sure the NDK version matches the current
+        repository. Otherwise, the app may not work properly.
+
+    adb install $PATH_TO_APP
+
+3.  Run the app, select the string to translate and press the 'go' button.
+
+4.  After the app goes through the strings for all locales, pull the output png
+    file from the device.
+
+    adb root && adb pull /data/data/com.android.recovery_l10n/files/text-out.png
+
+5.  Compress the output file put it under the corresponding directory.
+
+    *   "pngcrush -c 0 ..." converts "text-out.png" into a 1-channel image,
+        which is accepted by Recovery. This also compresses the image file by
+        ~60%.
+    *   If you're using other png compression tools, make sure the final text
+        image works by running graphic tests under the recovery mode.
+
+    pngcrush -c 0 text-out.png $OUTPUT_PNG
diff --git a/tools/recovery_l10n/res/values/strings.xml b/tools/recovery_l10n/res/values/strings.xml
index f6193ab17..48d18daca 100644
--- a/tools/recovery_l10n/res/values/strings.xml
+++ b/tools/recovery_l10n/res/values/strings.xml
@@ -9,6 +9,7 @@
     <item>erasing</item>
     <item>no_command</item>
     <item>error</item>
+    <item>installing_security</item>
   </string-array>
 
   <!-- Displayed on the screen beneath the animated android while the
diff --git a/tools/recovery_l10n/src/com/android/recovery_l10n/Main.java b/tools/recovery_l10n/src/com/android/recovery_l10n/Main.java
index 3f2bebe60..a974fa37a 100644
--- a/tools/recovery_l10n/src/com/android/recovery_l10n/Main.java
+++ b/tools/recovery_l10n/src/com/android/recovery_l10n/Main.java
@@ -139,6 +139,7 @@ public class Main extends Activity {
                     case 1: mStringId = R.string.recovery_erasing; break;
                     case 2: mStringId = R.string.recovery_no_command; break;
                     case 3: mStringId = R.string.recovery_error; break;
+                    case 4: mStringId = R.string.recovery_installing_security; break;
                 }
             }
             @Override public void onNothingSelected(AdapterView parent) { }
-- 
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