android: Introduce --enable-android-lok configure switch to fix RGB vs. BGR.

This indicates that the build targets the Online-based Android app, for
which we need to avoid various tweaks that are needed for the 'old'
Android app present in the android/ subdir of core.git.

In particular, the switch used in this patch fixes a RGBA vs. BGRA
confusion that caused yellow <-> cyan switch in the Online-based Android
app.

Change-Id: I5f394868f51ce87013677834cfafb967b9bb333e
Reviewed-on: https://gerrit.libreoffice.org/83342
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
(cherry picked from commit 49002a143a4534df5f6139e07fefd06174621c59)
Reviewed-on: https://gerrit.libreoffice.org/83718
Tested-by: Jenkins

config_host.mk.in

@@ -118,6 +118,7 @@ export DO_FETCH_TARBALLS=@DO_FETCH_TARBALLS@
 export DPKG=@DPKG@
 export EBOOK_CFLAGS=$(gb_SPACE)@EBOOK_CFLAGS@
 export EBOOK_LIBS=$(gb_SPACE)@EBOOK_LIBS@
+export ENABLE_ANDROID_LOK=@ENABLE_ANDROID_LOK@
 export ENABLE_ANDROID_EDITING=@ENABLE_ANDROID_EDITING@
 export ENABLE_AVAHI=@ENABLE_AVAHI@
 export ENABLE_BREAKPAD=@ENABLE_BREAKPAD@

config_host/config_features.h.in

@@ -151,4 +151,10 @@
  */
 #define HAVE_FEATURE_UPDATE_MAR 0
 
+/*
+ * Whether we are avoiding the tweaks needed for the Android app from the
+ * android/ subdir.
+ */
+#define HAVE_FEATURE_ANDROID_LOK 0
+
 #endif

configure.ac

@@ -544,6 +544,25 @@ if test -n "$with_android_sdk"; then
 fi
 AC_SUBST(ANDROID_SDK_HOME)
 
+AC_ARG_ENABLE([android-lok],
+    AS_HELP_STRING([--enable-android-lok],
+        [The Android app from the android/ subdir needs several tweaks all
+         over the place that break the LOK when used in the Online-based
+         Android app.  This switch indicates that the intent of this build is
+         actually the Online-based, non-modified LOK.])
+)
+ENABLE_ANDROID_LOK=
+if test -n "$ANDROID_NDK_HOME" ; then
+    if test "$enable_android_lok" = yes; then
+        ENABLE_ANDROID_LOK=TRUE
+        AC_DEFINE(HAVE_FEATURE_ANDROID_LOK)
+        AC_MSG_NOTICE([building the Android version... for the Online-based Android app])
+    else
+        AC_MSG_NOTICE([building the Android version... for the app from the android/ subdir])
+    fi
+fi
+AC_SUBST([ENABLE_ANDROID_LOK])
+
 libo_FUZZ_ARG_ENABLE([android-editing],
     AS_HELP_STRING([--enable-android-editing],
         [Enable the experimental editing feature on Android.])

external/cairo/UnpackedTarball_cairo.mk

@@ -23,7 +23,8 @@ $(eval $(call gb_UnpackedTarball_add_patches,cairo,\
 ))
 endif
 
-ifeq ($(OS),ANDROID)
+# To be applied only when ENABLE_ANDROID_LOK is not defined
+ifeq ($(OS)$(ENABLE_ANDROID_LOK),ANDROID)
 $(eval $(call gb_UnpackedTarball_add_patches,cairo,\
 	external/cairo/cairo/cairo.GL_RGBA.patch \
 ))

vcl/headless/svpgdi.cxx

@@ -17,6 +17,8 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include <config_features.h>
+
 #include <memory>
 #ifndef IOS
 #include <headless/svpgdi.hxx>
@@ -216,7 +218,7 @@ namespace
             sal_uInt8* pD = pDst->mpBits + y * pDst->mnScanlineSize;
             for (long x = 0; x < nWidth; ++x)
             {
-#if defined ANDROID
+#if defined(ANDROID) && !HAVE_FEATURE_ANDROID_LOK
                 static_assert((SVP_CAIRO_FORMAT & ~ScanlineFormat::TopDown) == ScanlineFormat::N32BitTcRgba, "Expected SVP_CAIRO_FORMAT set to N32BitTcBgra");
                 static_assert((SVP_24BIT_FORMAT & ~ScanlineFormat::TopDown) == ScanlineFormat::N24BitTcRgb, "Expected SVP_24BIT_FORMAT set to N24BitTcRgb");
                 pD[0] = pS[0];

vcl/inc/headless/svpgdi.hxx

@@ -24,6 +24,8 @@
 #error This file is not for iOS
 #endif
 
+#include <config_features.h>
+
 #include <osl/endian.h>
 #include <vcl/sysdata.hxx>
 #include <config_cairo_canvas.h>
@@ -40,7 +42,7 @@
 //cairo then matches the OpenGL GL_RGBA format so we can use it there
 //where we don't have GL_BGRA support.
 // SVP_24BIT_FORMAT is used to store 24-bit images in 3-byte pixels to conserve memory.
-#if defined ANDROID
+#if defined(ANDROID) && !HAVE_FEATURE_ANDROID_LOK
 #   define SVP_24BIT_FORMAT (ScanlineFormat::N24BitTcRgb | ScanlineFormat::TopDown)
 #   define SVP_CAIRO_FORMAT (ScanlineFormat::N32BitTcRgba | ScanlineFormat::TopDown)
 #   define SVP_CAIRO_BLUE 1