AnyImageImporter: Delegate .basis files to BasisImporter

Signed-off-by: Squareys <squareys@googlemail.com>

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp

@@ -57,7 +57,9 @@ void AnyImageImporter::doOpenFile(const std::string& filename) {
 
     /* Detect type from extension */
     std::string plugin;
-    if(Utility::String::endsWith(normalized, ".bmp"))
+    if(Utility::String::endsWith(normalized, ".basis"))
+        plugin = "BasisImporter";
+    else if(Utility::String::endsWith(normalized, ".bmp"))
         plugin = "BmpImporter";
     else if(Utility::String::endsWith(normalized, ".dds"))
         plugin = "DdsImporter";
@@ -128,8 +130,11 @@ void AnyImageImporter::doOpenData(Containers::ArrayView<const char> data) {
     CORRADE_INTERNAL_ASSERT(manager());
 
     std::string plugin;
+    /* https://github.com/BinomialLLC/basis_universal/blob/7d784c728844c007d8c95d63231f7adcc0f65364/transcoder/basisu_file_headers.h#L78 */
+    if(Utility::String::viewBeginsWith(data, "sB\0\x16"))
+        plugin = "BasisImporter";
     /* https://docs.microsoft.com/cs-cz/windows/desktop/direct3ddds/dx-graphics-dds-pguide */
-    if(Utility::String::viewBeginsWith(data, "DDS "))
+    else if(Utility::String::viewBeginsWith(data, "DDS "))
         plugin = "DdsImporter";
     /* http://www.openexr.com/openexrfilelayout.pdf */
     else if(Utility::String::viewBeginsWith(data, "\x76\x2f\x31\x01"))

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.h

@@ -66,6 +66,8 @@ of the `Magnum` package and link to the `Magnum::AnyImageImporter` target. See
 
 Supported formats:
 
+-   Basis Universal (`*.basis`), loaded @ref BasisImporter or any other plugin
+    that provides it
 -   Windows Bitmap (`*.bmp`), loaded with any plugin that provides `BmpImporter`
 -   DirectDraw Surface (`*.dds` or data with corresponding signature), loaded
     with @ref DdsImporter or any other plugin that provides it

src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp

@@ -87,7 +87,8 @@ constexpr struct {
     {"BMP", "image.bmp", nullptr, "BmpImporter"},
     {"GIF", "image.gif", nullptr, "GifImporter"},
     {"PSD", "image.psd", nullptr, "PsdImporter"},
-    {"TIFF", "image.tiff", nullptr, "TiffImporter"}
+    {"TIFF", "image.tiff", nullptr, "TiffImporter"},
+    {"Basis", "rgb.basis", nullptr, "BasisImporter"}
     /* Not testing everything, just the most important ones */
 };
 

src/MagnumPlugins/AnyImageImporter/Test/CMakeLists.txt

@@ -56,6 +56,7 @@ corrade_add_test(AnyImageImporterTest AnyImageImporterTest.cpp
     FILES
         gray.jpg
         image.exr
+        rgb.basis
         rgb.hdr
         rgb.png
         rgba_dxt1.dds