Adjust the background text image width to reduce its size

We can adjust the image width with respect to the maximum width of the
wrapped text. This will remove some black margins and reduce the final
size of the images, especially for those with short strings, e.g.
"recovery_error".

Also, add an option to centrally align the text; and fix a boundary
check in the recovery resource test.

Bug: 74397117
Test: Generate and check the image
Change-Id: Ib6cf61a9c99c4aeede16751dc0adfa23ce3f5424
diff --git a/tests/component/resources_test.cpp b/tests/component/resources_test.cpp
index 54329db..d7fdb8f 100644
--- a/tests/component/resources_test.cpp
+++ b/tests/component/resources_test.cpp
@@ -101,7 +101,7 @@
     EXPECT_LT(0, len) << "Locale string should be non-empty.";
     EXPECT_NE(0, row[5]) << "Locale string is missing.";
 
-    ASSERT_GT(png_->height(), y + 1 + h) << "Locale: " << kLocale << " is not found in the file.";
+    ASSERT_GE(png_->height(), y + 1 + h) << "Locale: " << kLocale << " is not found in the file.";
     char* loc = reinterpret_cast<char*>(&row[5]);
     if (matches_locale(loc, kLocale.c_str())) {
       EXPECT_TRUE(android::base::StartsWith(loc, kLocale));