sceJpeg: improved conversion to YUV420: store U and V in blocks of 2x2 pixels, take mean value of these 4 pixels when storing UV.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3370 4ab978e6-3352-0410-996c-0b42db0051c8
Improve video command TRXKICK when performing a transfer to the GE.
Added a WARNing when using a texture from the swizzled VRAM address space. Not sure if some application is using this address space.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3371 4ab978e6-3352-0410-996c-0b42db0051c8
Added a log message when a thread owning a mutex is deleted. I've not yet tested this case on a PSP.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3372 4ab978e6-3352-0410-996c-0b42db0051c8