[Mesa-dev] __DRIimage sub-image v2 series

[Kristian Høgsberg]

Here's the patch series with Erics suggestion and comments incorporated,
and I've also added support for the packed YUYV format in this version.

The changes since last series boils down to:

 - Use 	__DRI_IMAGE_FORMAT_NONE when we create a __DRIimage we don't intend
   to texture from, and don't expose YUV __DRIimage formats.

 - The RG88 format is really GR88, since the __DRIimage formats are native
   endian.

 - Document lifetime rules for sub-images.

 - Document that rendering to overlapping sub-images is undefined
   (for both __DRIimages and for EGLImages created this way using the
   wayland EGL extension).

 - Validate that a sub-image is contained in the buffer object.

 - Remember to set image->screen from parent image screen when creating
   sub-image.

Kristian