Audio,Text,Trade: accept void ArrayViews in importer plugins.

This makes it much less annoying to pass arbitrarily typed data, such as
std::uint8_t or char8_t and what not. It was already done like this for
the new shader converter plugins, where the input is often 32-bit ints
for SPIR-V.

OTOH the internal virtual API is kept with ArrayView<const char>, as
that makes it easier to operate on by the implementations.

doc/changelog.dox

@@ -2305,7 +2305,7 @@ Released 2019-10-24, tagged as
 -   @cpp Text::AbstractFont::openSingleData() @ce and
     @cpp Text::AbstractFont::openData() @ce taking a list of files are
     deprecated in favor of
-    @ref Text::AbstractFont::openData(Containers::ArrayView<const char>, Float)
+    @ref Text::AbstractFont::openData(Containers::ArrayView<const void>, Float)
     and @ref Text::AbstractFont::setFileCallback()
 -   @ref GL::Buffer::setData() and @ref GL::Buffer::setSubData() no longer has
     overloads taking @ref std::vector / @ref std::array, but instead relies on

src/Magnum/Audio/AbstractImporter.cpp

@@ -73,12 +73,12 @@ AbstractImporter::AbstractImporter(PluginManager::Manager<AbstractImporter>& man
 
 AbstractImporter::AbstractImporter(PluginManager::AbstractManager& manager, const std::string& plugin): PluginManager::AbstractManagingPlugin<AbstractImporter>{manager, plugin} {}
 
-bool AbstractImporter::openData(Containers::ArrayView<const char> data) {
+bool AbstractImporter::openData(Containers::ArrayView<const void> data) {
     CORRADE_ASSERT(features() & ImporterFeature::OpenData,
         "Audio::AbstractImporter::openData(): feature not supported", {});
 
     close();
-    doOpenData(data);
+    doOpenData(Containers::arrayCast<const char>(data));
     return isOpened();
 }
 

src/Magnum/Audio/AbstractImporter.h

@@ -167,7 +167,7 @@ class MAGNUM_AUDIO_EXPORT AbstractImporter: public PluginManager::AbstractManagi
          * Returns @cpp true @ce on success, @cpp false @ce otherwise.
          * @see @ref features(), @ref openFile()
          */
-        bool openData(Containers::ArrayView<const char> data);
+        bool openData(Containers::ArrayView<const void> data);
 
         /**
          * @brief Open file

src/Magnum/Text/AbstractFont.cpp

@@ -87,7 +87,7 @@ void AbstractFont::setFileCallback(Containers::Optional<Containers::ArrayView<co
 
 void AbstractFont::doSetFileCallback(Containers::Optional<Containers::ArrayView<const char>>(*)(const std::string&, InputFileCallbackPolicy, void*), void*) {}
 
-bool AbstractFont::openData(Containers::ArrayView<const char> data, const Float size) {
+bool AbstractFont::openData(Containers::ArrayView<const void> data, const Float size) {
     CORRADE_ASSERT(features() & FontFeature::OpenData,
         "Text::AbstractFont::openData(): feature not supported", false);
 
@@ -95,7 +95,7 @@ bool AbstractFont::openData(Containers::ArrayView<const char> data, const Float
        the check doesn't be done on the plugin side) because for some file
        formats it could be valid (MagnumFont in particular). */
     close();
-    const Metrics metrics = doOpenData(data, size);
+    const Metrics metrics = doOpenData(Containers::arrayCast<const char>(data), size);
     _size = metrics.size;
     _ascent = metrics.ascent;
     _descent = metrics.descent;

src/Magnum/Text/AbstractFont.h

@@ -318,20 +318,20 @@ class MAGNUM_TEXT_EXPORT AbstractFont: public PluginManager::AbstractPlugin {
          * Returns @cpp true @ce on success, @cpp false @ce otherwise.
          * @see @ref features(), @ref openFile()
          */
-        bool openData(Containers::ArrayView<const char> data, Float size);
+        bool openData(Containers::ArrayView<const void> data, Float size);
 
         #ifdef MAGNUM_BUILD_DEPRECATED
-        /** @brief @copybrief openData(Containers::ArrayView<const char>, Float)
+        /** @brief @copybrief openData(Containers::ArrayView<const void>, Float)
          * @m_deprecated_since{2019,10} Use @ref openFile() with
          *      @ref setFileCallback() for opening multi-file fonts instead.
          */
         CORRADE_DEPRECATED("use openFile() with setFileCallback() for opening multi-file fonts instead") bool openData(const std::vector<std::pair<std::string, Containers::ArrayView<const char>>>& data, Float size);
 
-        /** @brief @copybrief openData(Containers::ArrayView<const char>, Float)
+        /** @brief @copybrief openData(Containers::ArrayView<const void>, Float)
-         * @m_deprecated_since{2019,10} Use @ref openData(Containers::ArrayView<const char>, Float)
+         * @m_deprecated_since{2019,10} Use @ref openData(Containers::ArrayView<const void>, Float)
          *      instead.
          */
-        CORRADE_DEPRECATED("use openData(Containers::ArrayView<const char>, Float) instead") bool openSingleData(Containers::ArrayView<const char> data, Float size);
+        CORRADE_DEPRECATED("use openData(Containers::ArrayView<const void>, Float) instead") bool openSingleData(Containers::ArrayView<const char> data, Float size);
         #endif
 
         /**

src/Magnum/Trade/AbstractImporter.cpp

@@ -123,7 +123,7 @@ void AbstractImporter::setFileCallback(Containers::Optional<Containers::ArrayVie
 
 void AbstractImporter::doSetFileCallback(Containers::Optional<Containers::ArrayView<const char>>(*)(const std::string&, InputFileCallbackPolicy, void*), void*) {}
 
-bool AbstractImporter::openData(Containers::ArrayView<const char> data) {
+bool AbstractImporter::openData(Containers::ArrayView<const void> data) {
     CORRADE_ASSERT(features() & ImporterFeature::OpenData,
         "Trade::AbstractImporter::openData(): feature not supported", {});
 
@@ -131,7 +131,7 @@ bool AbstractImporter::openData(Containers::ArrayView<const char> data) {
        the check doesn't be done on the plugin side) because for some file
        formats it could be valid (e.g. OBJ or JSON-based formats). */
     close();
-    doOpenData(Containers::Array<char>{const_cast<char*>(data.data()), data.size(), Implementation::nonOwnedArrayDeleter}, {});
+    doOpenData(Containers::Array<char>{const_cast<char*>(static_cast<const char*>(data.data())), data.size(), Implementation::nonOwnedArrayDeleter}, {});
     return isOpened();
 }
 

src/Magnum/Trade/AbstractImporter.h

@@ -633,7 +633,7 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
          * @p data is not expected to be alive after the function exits.
          * @see @ref features(), @ref openFile()
          */
-        bool openData(Containers::ArrayView<const char> data);
+        bool openData(Containers::ArrayView<const void> data);
 
         /**
          * @brief Open already loaded state