Add very basic compressed texture support

Allow direct loading of pkm texture files into Image. This can
be extended to additional texture types, and then eventually
turned into a full plugin architexture.

[ChangeLog][Qt Quick] Allow direct loading of pkm texture files
into Image. For example: Image { source: "myImage.pkm" }

Change-Id: I1baed6c3e85a15752da8adc675482d874c9355ab
Task-number: QTBUG-59872
Task-number: QTBUG-29451
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/examples/quick/textureprovider/main.cpp b/examples/quick/textureprovider/main.cpp
index ea4f73127d..f92d34ada5 100644
--- a/examples/quick/textureprovider/main.cpp
+++ b/examples/quick/textureprovider/main.cpp
@@ -48,6 +48,10 @@ int main(int argc, char* argv[])
     QGuiApplication app(argc,argv);
     QQuickView view;
 
+    /*
+          NOTE: ETC compressed textures in PKM files are supported out-of-the-box since Qt 5.10.
+          However, we retain this example to show how custom texture providers can be integrated.
+    */
     EtcProvider *provider = new EtcProvider();
     provider->setBaseUrl(QUrl("qrc:///textureprovider/"));
     view.engine()->addImageProvider("etc", provider);