Add initial implementation of an Android icon engine

Try to use the Downloadable Font APIs from AndroidX to download the
Material Symbols font. This would ideally allow us to add the official
icon variations dynamically to the device's font cache.

This works for several fonts from Google Fonts, but not for the fonts
we need. So, for the time being, add a path where we consult the
resource system for an embedded font file as well. Then an application
can add e.g. the font file for the desired icons variation, and Qt will
use those glyphs to render icons. Do this in the manual test, using
cmake's FetchContent feature to download the font from Googlei's github
repository.

The incomplete mapping is based on the standard Material icons
documentation at https://fonts.google.com/icons. We could in theory use
the `codepoints` file that comes with the font files to create the
mapping, but then we'd end up with platform specific icon names.

Task-number: QTBUG-102346
Change-Id: Ibff3fe6d310a388e6111d983815ef0ddffb684c8
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

2 files changed, 39 insertions, 0 deletions

diff --git a/tests/manual/iconbrowser/CMakeLists.txt b/tests/manual/iconbrowser/CMakeLists.txt
index 4bd22f7eff..eb304d25a2 100644
--- a/tests/manual/iconbrowser/CMakeLists.txt
+++ b/tests/manual/iconbrowser/CMakeLists.txt
@@ -13,3 +13,38 @@ qt_internal_add_manual_test(iconbrowser
         Qt::Widgets
         Qt::WidgetsPrivate
 )
+
+if (ANDROID)
+    set(font_filename "MaterialIcons-Regular.ttf")
+    if (QT_ALLOW_DOWNLOAD)
+        include(FetchContent)
+
+        FetchContent_Declare(
+            MaterialIcons
+            URL
+                "https://github.com/google/material-design-icons/raw/master/font/${font_filename}"
+            DOWNLOAD_DIR        ${CMAKE_CURRENT_BINARY_DIR}
+            DOWNLOAD_NAME       "${font_filename}"
+            DOWNLOAD_NO_EXTRACT TRUE
+        )
+
+        FetchContent_MakeAvailable(MaterialIcons)
+    endif()
+
+    if (EXISTS "${CMAKE_CURRENT_BINARY_DIR}/${font_filename}")
+        set_source_files_properties("${CMAKE_CURRENT_BINARY_DIR}/${font_filename}"
+                                    PROPERTIES QT_RESOURCE_ALIAS ${font_filename})
+        target_compile_definitions(iconbrowser PRIVATE "ICONBROWSER_RESOURCE")
+        qt_add_resources(iconbrowser "icons"
+            PREFIX
+                "/qt-project.org/icons"
+            FILES
+                "${CMAKE_CURRENT_BINARY_DIR}/${font_filename}"
+        )
+    else()
+        message(WARNING "Font file ${font_filename} not found and not downloaded!\n"
+                        "Make sure the font file ${font_filename} is available in ${CMAKE_CURRENT_BINARY_DIR}.\n"
+                        "Consider configuring with -DQT_ALLOW_DOWNLOAD=ON to download the font automatically.")
+    endif()
+endif()
+
diff --git a/tests/manual/iconbrowser/main.cpp b/tests/manual/iconbrowser/main.cpp
index f145485329..8acff69fa2 100644
--- a/tests/manual/iconbrowser/main.cpp
+++ b/tests/manual/iconbrowser/main.cpp
@@ -534,6 +534,10 @@ int main(int argc, char* argv[])
 
     QApplication app(argc, argv);
 
+#ifdef ICONBROWSER_RESOURCE
+    Q_INIT_RESOURCE(icons);
+#endif
+
     IconModel model;
 
     QTabWidget widget;