Some QML components are not rendered and/or appear as black in 10-bit per channel mode (30-bit color)

Some QML components are not rendered and/or appear as black in 10-bit per channel mode (30-bit color).

To replicate:
On a Linux system in 30-bit color mode, launch Qt Creator and note that the welcome page contains nothing but black. (See first attached screenshot)

Workaround:
Apply the attached patch and rebuild Qt and Qt Creator. On a Linux system in 30-bit color mode, launch Qt Creator. Note that the welcome page is rendered correctly. (See second attached screenshot)

Comments:

• The attached patch is adapted from https://bugreports.qt.io/browse/QTBUG-45858 .
• It would be great if the scene graph and quick2 gained built-in support for more or even every texture and framebuffer channel arrangement and data type. To get some immediate relief from the itch, I made a scene graph plugin that adds support for float32-per-channel formats: https://github.com/erikhvatum/StackStream