[cairo] i am not clear about the STRIDE parameter present in cairo_image_surface_create_for_data ()...

[Rajeshwaran Paulchamy]

i have created a surface using the format CAIRO_FORMAT_A1

 

            surface           =
cairo_image_surface_create_for_data

 
(imgarray,

 
CAIRO_FORMAT_A1,

 
16,  /*width*/

 
18,  /*height*/

                                                2   /*stride*/   );

 

then i have rendered the image by using below.

 

                        cairo_mask_surface     (      cr,

 
surface,

 
20,

 
60);

 

the result i have received as below.

 

         

 

 

but the result should be come as below

 

 

 

please help me,  in the api cairo_image_surface_create_for_data () what
will be the value, i have to give to the STRIDE parameter to get  the
correct output,  

 

i am not clear about STRIDE parameter. what is the exact definition for
this? CAIRO document definition not able to understand by me.

 

cheers,

rajeshwaran paulchamy.

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