Finally ,??configure the framebuffer ok.But after
several experiments ,I found the speed of yuv overlay
had droped greatly.
the following is my debug output.From it ,you can see,
when I have no fb support , I get a very fast speed.
but when I compile a new kernel with fb support, the
speed becomes slower.
Morever,on framebuffer console ,the first time I run
my program ,It must get very slow .but the second ,the
third …,you can see the speed will get a great
improvement though it is still slower than on xwindow
btw,my video card is nvidia tnt2
/////////////////
xwindow without framebuffer
/////////////////
over display size is 352x240
time consume is 605.000000 milliseconds
frame rate is 247.933884 ///the first time run
over display size is 352x240
time consume is 599.000000 milliseconds //second
frame rate is 250.417362
over display size is 352x240
time consume is 602.000000 milliseconds//third
frame rate is 249.169435
/////////////////////
framebuffer console
/////////////////
over display size is 352x240
time consume is 7533.000000 milliseconds
frame rate is 19.912386 ///the first time run
over display size is 352x240
time consume is 1313.000000 milliseconds//2nd
frame rate is 114.242193
over display size is 352x240
time consume is 1311.000000 milliseconds//3rd
frame rate is 114.416476__________________________________________________
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