少库imsetAlphaBit，undefined reference to `imsetAlphaBit(rga_buffer_t*, unsigned char, unsigned char)'

[caip1299920300]

按照给的librga进行编译，发现编译到samples/alpha_demo/src/rga_alpha_rgba5551_demo.cpp 报错： lpha_rgba5551_demo.dir/rga_alpha_rgba5551_demo.cpp.o: in function main': rga_alpha_rgba5551_demo.cpp:(.text.startup+0x360): undefined reference to imsetAlphaBit(rga_buffer_t*, unsigned char, unsigned char)'

缺少了imsetAlphaBit的库的导入，我查看了里面所有的文件，都没有这个函数