[cairo] About CAIRO API

[lixuanzhao]

Cairo：
hello，
I have a question and hope to receive it. 
It is found that there is a function  
cairo_public cairo_surface_t *
cairo_image_surface_create_from_png (const char *filename);
 If the read PNG background color is non transparent, the read data is 0xff.
 Can this function only read the data of transparent background color?
 I hope to get a reply and answer. Thank you.




lixuanzhao
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