AnyImageConverter: support KTX2 also in 3D and 2D/3D levels code paths.

And prefere to use it onver OpenEXR in most AnyImage{Converter,Importer}
tests, unless the test really needs something that only OpenEXR has
(such as the verbose output for threads or configuration that needs to
be set on both export and import to make the import succeed).

src/MagnumPlugins/AnyImageConverter/AnyImageConverter.cpp

@@ -144,6 +144,8 @@ bool AnyImageConverter::doConvertToFile(const ImageView3D& image, const Containe
     Containers::StringView plugin;
     if(normalized.hasSuffix(".exr"_s))
         plugin = "OpenExrImageConverter"_s;
+    else if(normalized.hasSuffix(".ktx2"_s))
+        plugin = "KtxImageConverter"_s;
     else {
         Error{} << "Trade::AnyImageConverter::convertToFile(): cannot determine the format of" << filename << "for a 3D image";
         return false;
@@ -223,6 +225,8 @@ bool AnyImageConverter::doConvertToFile(const Containers::ArrayView<const ImageV
     Containers::StringView plugin;
     if(normalized.hasSuffix(".exr"_s))
         plugin = "OpenExrImageConverter"_s;
+    else if(normalized.hasSuffix(".ktx2"_s))
+        plugin = "KtxImageConverter"_s;
     else {
         Error{} << "Trade::AnyImageConverter::convertToFile(): cannot determine the format of" << filename << "for a multi-level 2D image";
         return false;
@@ -266,6 +270,8 @@ bool AnyImageConverter::doConvertToFile(const Containers::ArrayView<const ImageV
     Containers::StringView plugin;
     if(normalized.hasSuffix(".exr"_s))
         plugin = "OpenExrImageConverter"_s;
+    else if(normalized.hasSuffix(".ktx2"_s))
+        plugin = "KtxImageConverter"_s;
     else {
         Error{} << "Trade::AnyImageConverter::convertToFile(): cannot determine the format of" << filename << "for a multi-level 3D image";
         return false;

src/MagnumPlugins/AnyImageConverter/Test/CMakeLists.txt

@@ -29,12 +29,12 @@ find_package(Threads REQUIRED)
 
 if(CORRADE_TARGET_EMSCRIPTEN OR CORRADE_TARGET_ANDROID)
     set(ANYIMAGECONVERTER_TEST_OUTPUT_DIR "write")
+    set(KTX_3D_FILE 3d.ktx2)
     set(EXR_FILE depth32f-custom-channels.exr)
-    set(EXR_CUBE_FILE cube.exr)
 else()
     set(ANYIMAGECONVERTER_TEST_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
+    set(KTX_3D_FILE ${PROJECT_SOURCE_DIR}/src/MagnumPlugins/AnyImageImporter/Test/3d.ktx2)
     set(EXR_FILE ${PROJECT_SOURCE_DIR}/src/MagnumPlugins/AnyImageImporter/Test/depth32f-custom-channels.exr)
-    set(EXR_CUBE_FILE ${PROJECT_SOURCE_DIR}/src/MagnumPlugins/AnyImageImporter/Test/cube.exr)
 endif()
 
 # CMake before 3.8 has broken $<TARGET_FILE*> expressions for iOS (see
@@ -62,7 +62,7 @@ corrade_add_test(AnyImageConverterTest AnyImageConverterTest.cpp
         # now
         Threads::Threads
     FILES
-        ../../AnyImageImporter/Test/cube.exr
+        ../../AnyImageImporter/Test/3d.ktx2
         ../../AnyImageImporter/Test/depth32f-custom-channels.exr)
 target_include_directories(AnyImageConverterTest PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>)
 if(MAGNUM_ANYIMAGECONVERTER_BUILD_STATIC)

src/MagnumPlugins/AnyImageConverter/Test/configure.h.cmake

@@ -26,8 +26,8 @@
 #cmakedefine ANYIMAGECONVERTER_PLUGIN_FILENAME "${ANYIMAGECONVERTER_PLUGIN_FILENAME}"
 #cmakedefine TGAIMAGECONVERTER_PLUGIN_FILENAME "${TGAIMAGECONVERTER_PLUGIN_FILENAME}"
 #define ANYIMAGECONVERTER_TEST_OUTPUT_DIR "${ANYIMAGECONVERTER_TEST_OUTPUT_DIR}"
+#define KTX_3D_FILE "${KTX_3D_FILE}"
 #define EXR_FILE "${EXR_FILE}"
-#define EXR_CUBE_FILE "${EXR_CUBE_FILE}"
 
 #ifdef CORRADE_TARGET_WINDOWS
 #ifdef CORRADE_IS_DEBUG_BUILD

src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp

@@ -86,8 +86,8 @@ constexpr struct {
     Containers::Optional<Containers::ArrayView<const char>>(*callback)(const std::string&, InputFileCallbackPolicy, Containers::Array<char>&);
     const char* messageFunctionName;
 } Load3DData[]{
-    {"EXR", EXR_CUBE_FILE, nullptr, "OpenExrImporter"},
-    {"EXR data", EXR_CUBE_FILE, fileCallback, "OpenExrImporter"},
+    {"KTX2", KTX_3D_FILE, nullptr, "KtxImporter"},
+    {"KTX2 data", KTX_3D_FILE, fileCallback, "KtxImporter"},
 };
 
 constexpr struct {
@@ -224,8 +224,8 @@ void AnyImageImporterTest::load3D() {
     CORRADE_VERIFY(manager.load(ANYIMAGEIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
     #endif
 
-    if(manager.loadState("OpenExrImporter") < PluginManager::LoadState::Loaded)
-        CORRADE_SKIP("OpenExrImporter plugin can't be loaded.");
+    if(manager.loadState("KtxImporter") < PluginManager::LoadState::Loaded)
+        CORRADE_SKIP("KtxImporter plugin can't be loaded.");
 
     Containers::Pointer<AbstractImporter> importer = manager.instantiate("AnyImageImporter");
 
@@ -238,7 +238,7 @@ void AnyImageImporterTest::load3D() {
     /* Check only size, as it is good enough proof that it is working */
     Containers::Optional<ImageData3D> image = importer->image3D(0);
     CORRADE_VERIFY(image);
-    CORRADE_COMPARE(image->size(), (Vector3i{1, 1, 6}));
+    CORRADE_COMPARE(image->size(), (Vector3i{2, 3, 2}));
 }
 
 void AnyImageImporterTest::detect() {

src/MagnumPlugins/AnyImageImporter/Test/CMakeLists.txt

@@ -26,13 +26,13 @@
 if(CORRADE_TARGET_EMSCRIPTEN OR CORRADE_TARGET_ANDROID)
     set(TEST_FILE_DIR .)
     set(TGA_FILE rgb.tga)
+    set(KTX_3D_FILE 3d.ktx2)
     set(EXR_FILE depth32f-custom-channels.exr)
-    set(EXR_CUBE_FILE cube.exr)
 else()
     set(TEST_FILE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
     set(TGA_FILE ${CMAKE_CURRENT_SOURCE_DIR}/rgb.tga)
+    set(KTX_3D_FILE ${CMAKE_CURRENT_SOURCE_DIR}/3d.ktx2)
     set(EXR_FILE ${CMAKE_CURRENT_SOURCE_DIR}/depth32f-custom-channels.exr)
-    set(EXR_CUBE_FILE ${CMAKE_CURRENT_SOURCE_DIR}/cube.exr)
 endif()
 
 # CMake before 3.8 has broken $<TARGET_FILE*> expressions for iOS (see
@@ -55,10 +55,10 @@ file(GENERATE OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/configure.h
 corrade_add_test(AnyImageImporterTest AnyImageImporterTest.cpp
     LIBRARIES MagnumTrade MagnumDebugTools
     FILES
-        # Taken from OpenExrImporter tests
+        # Generated by AnyImageConverterTest::propagateConfiguration2D()
         depth32f-custom-channels.exr
-        # Generated by AnyImageConverterTest::propagateConfiguration3D()
-        cube.exr
+        # Generated by AnyImageConverterTest::convert3D()
+        3d.ktx2
         gray.jpg
         image.exr
         image.tiff

src/MagnumPlugins/AnyImageImporter/Test/configure.h.cmake

@@ -27,8 +27,8 @@
 #cmakedefine TGAIMPORTER_PLUGIN_FILENAME "${TGAIMPORTER_PLUGIN_FILENAME}"
 #define TGA_FILE "${TGA_FILE}"
 #define TEST_FILE_DIR "${TEST_FILE_DIR}"
+#define KTX_3D_FILE "${KTX_3D_FILE}"
 #define EXR_FILE "${EXR_FILE}"
-#define EXR_CUBE_FILE "${EXR_CUBE_FILE}"
 
 #ifdef CORRADE_TARGET_WINDOWS
 #ifdef CORRADE_IS_DEBUG_BUILD