Put different UI density levels into a enumeration

src/anbox/graphics/density.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2016 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ANBOX_GRAPHICS_DENSITY_H_
+#define ANBOX_GRAPHICS_DENSITY_H_
+
+namespace anbox {
+namespace graphics {
+/**
+ * @brief Defines different types of density being used in an Android system. See the
+ *        documentation in frameworks/base/core/java/android/util/DisplayMetrics.java
+ *        of the Android source tree which defines the different types.
+ */
+enum class DensityType {
+    low = 120,
+    medium = 160,
+    tv = 213,
+    high = 240,
+    xhigh = 360,
+    xxhigh = 480,
+};
+} // namespace graphics
+} // namespace anbox
+
+#endif

src/anbox/qemu/boot_properties_message_processor.cpp

@@ -16,7 +16,8 @@
  */
 
 #include "anbox/qemu//boot_properties_message_processor.h"
-#include "anbox/logger.h"
+#include "anbox/graphics/density.h"
+#include "anbox/utils.h"
 
 namespace anbox {
 namespace qemu {
@@ -31,8 +32,6 @@ BootPropertiesMessageProcessor::~BootPropertiesMessageProcessor() {
 void BootPropertiesMessageProcessor::handle_command(const std::string &command) {
     if (command == "list")
         list_properties();
-    else
-        DEBUG("Unknown command '%s'", command);
 }
 
 void BootPropertiesMessageProcessor::list_properties() {
@@ -55,7 +54,7 @@ void BootPropertiesMessageProcessor::list_properties() {
 
         // TODO(morphis): Using HDPI here for now but should be adjusted to the device
         // we're running on.
-        "ro.sf.lcd_density=200",
+        utils::string_format("ro.sf.lcd_density=%d", static_cast<int>(graphics::DensityType::high)),
 
         // libhwui detects that we support certain GLESv3 extensions which
         // we don't yet support in our host channel so we have to disable
@@ -65,6 +64,10 @@ void BootPropertiesMessageProcessor::list_properties() {
         // This will give us a virtual on screen navigation area at the bottom
         // of the screen we really need to navigate through the system.
         "qemu.hw.mainkeys=0",
+
+        // To let surfaceflinger load our hwcomposer implementation we specify
+        // the correct subkey of the module here.
+        // "ro.hardware.hwcomposer=anbox",
     };
 
     for (const auto &prop : properties) {