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

[Gerdus van Zyl]

The stride is how many pieces of information make up a row of pixels. eg.
ARGB is 4xWidth.
Since cairo 1.6 you should use the cairo_format_stride_for_width function to
get the correct stride (which may differ with cairo optimizations).

~Gerdus

On Mon, Apr 14, 2008 at 4:19 PM, Rajeshwaran Paulchamy <
Rajeshwaran.Paulchamy at toshiba-tesi.com> wrote:

>  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.
>
>
>
> [image: *]
>
>
>
>
>
> 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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