TgaImageConverter: expose file extension and MIME type interfaces.

src/MagnumPlugins/TgaImageConverter/Test/TgaImageConverterTest.cpp

@@ -142,6 +142,9 @@ void TgaImageConverterTest::rgb() {
     setTestCaseDescription(data.name);
 
     Containers::Pointer<AbstractImageConverter> converter = _converterManager.instantiate("TgaImageConverter");
+    CORRADE_COMPARE(converter->extension(), "tga");
+    CORRADE_COMPARE(converter->mimeType(), "image/x-tga");
+
     converter->setFlags(data.flags);
 
     std::ostringstream out;

src/MagnumPlugins/TgaImageConverter/TgaImageConverter.cpp

@@ -29,6 +29,7 @@
 #include <tuple>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/Optional.h>
+#include <Corrade/Containers/String.h>
 #include <Corrade/Utility/Algorithms.h>
 #include <Corrade/Utility/Endianness.h>
 
@@ -40,12 +41,23 @@
 
 namespace Magnum { namespace Trade {
 
+using namespace Containers::Literals;
+
 TgaImageConverter::TgaImageConverter() = default;
 
 TgaImageConverter::TgaImageConverter(PluginManager::AbstractManager& manager, const Containers::StringView& plugin): AbstractImageConverter{manager, plugin} {}
 
 ImageConverterFeatures TgaImageConverter::doFeatures() const { return ImageConverterFeature::Convert2DToData; }
 
+Containers::String TgaImageConverter::doExtension() const { return "tga"_s; }
+
+Containers::String TgaImageConverter::doMimeType() const {
+    /* https://en.wikipedia.org/wiki/Truevision_TGA says there's no registered
+       MIME type. It probably never will be. Using `file --mime-type` on a TGA
+       file returns image/x-tga, so using that here as well. */
+    return "image/x-tga"_s;
+}
+
 Containers::Optional<Containers::Array<char>> TgaImageConverter::doConvertToData(const ImageView2D& image) {
     /* Warn about lost metadata */
     if(image.flags() & ImageFlag2D::Array) {
@@ -98,4 +110,4 @@ Containers::Optional<Containers::Array<char>> TgaImageConverter::doConvertToData
 }}
 
 CORRADE_PLUGIN_REGISTER(TgaImageConverter, Magnum::Trade::TgaImageConverter,
-    "cz.mosra.magnum.Trade.AbstractImageConverter/0.3.2")
+    "cz.mosra.magnum.Trade.AbstractImageConverter/0.3.3")

src/MagnumPlugins/TgaImageConverter/TgaImageConverter.h

@@ -97,6 +97,10 @@ and have the files smaller, use the @ref StbImageConverter plugin instead.
 The TGA file format doesn't have a way to distinguish between 2D and 1D array
 images. If an image has @ref ImageFlag2D::Array set, a warning is printed and
 the file is saved as a regular 2D image.
+
+While TGA files can have several extensions, @ref extension() always returns
+@cpp "tga" @ce as that's the most common one. As TGA doesn't have a registered
+MIME type, @ref mimeType() returns @cpp "image/x-tga" @ce.
 */
 class MAGNUM_TGAIMAGECONVERTER_EXPORT TgaImageConverter: public AbstractImageConverter {
     public:
@@ -108,6 +112,8 @@ class MAGNUM_TGAIMAGECONVERTER_EXPORT TgaImageConverter: public AbstractImageCon
 
     private:
         MAGNUM_TGAIMAGECONVERTER_LOCAL ImageConverterFeatures doFeatures() const override;
+        MAGNUM_TGAIMAGECONVERTER_LOCAL Containers::String doExtension() const override;
+        MAGNUM_TGAIMAGECONVERTER_LOCAL Containers::String doMimeType() const override;
         MAGNUM_TGAIMAGECONVERTER_LOCAL Containers::Optional<Containers::Array<char>> doConvertToData(const ImageView2D& image) override;
 };