Hi, copybit is just an abstraction for a basic 2D blitter with support for rotation, scaling and color/pixelformat conversions. These features can be supported in full or partially.
If the copybit module is present, then SurfaceFlinger will try to use it instead of using OpenGL ES. On the G1 copybit is used for all window compositions and video playback (CC and scaling), on this h/w copybit is very fast and provide very good up and down scaling. HOWEVER, on the release after Donut, the copybit module won't be used by SurfaceFlinger directly, instead it will be used as a back-end for our software OpenGL ES 1.x and SurfaceFlinger will only use the OpenGL ES API. Eventually, the copybit module will be phased out, instead, we will ask the ISV/OEMs to implement these features on their OpenGL ES drivers, if they think it is necessary. If your h/w doesn't have accelerated GL, but has some sort of decent 2D blitter, you can write a copybit HAL module for it, and it will be used automatically by SurfaceFlinger -- at least under cupcake and donut. Mathias On May 20, 8:57 pm, Wenlong Li <wenl...@gmail.com> wrote: > Should I send this message to this group? anyone can help answer my > question. thx very much > > On Wed, May 20, 2009 at 6:17 PM, Wenlong Li <wenl...@gmail.com> wrote: > > Hello, > > > Can anyone share some info about copybit? I saw there is a header file > > (copybit.h) under hardware directory, but don't know the detailed > > implementation. I guess the main operation is to copy image from > > source to destination, and scale image. Is my understanding correct? > > > Besides these, can it support image format conversion, such as from > > YUV to RGB. Seems camera capatures image in YUV format, and does > > conversion before showing it in screen. > > > The third question is which device is used for copybit? GPU or other > > devices? > > > thx, > > Wenlong --~--~---------~--~----~------------~-------~--~----~ unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting -~----------~----~----~----~------~----~------~--~---
