Re: Image missdisplayed using GdkPixmap

["Jim George" <jimgeorge gmail com>]

On 9/24/06, Sebastien Roy <morgan sebastien gmail com> wrote:
> Image is not well written ...
> lines seems to be mixed ... Alignement is incorrect ..
> I suppose this is due to a wrong usage of dithering/depth parameters ...
> data is pointing to a rgb buffer ...
> the same call was working fine when writing directly to a windows instead of
> a newly created
> pixmap.
> Image may not be loaded from a file as it is received from network, that's
> while it's stored in a buffer.
>
> cnx->pixmap is a GtkPixmap*
> cnx->window is a TOPLEVEL window GtkWidget*
>
>
>    1.   cnx->pixmap = gdk_pixmap_new(0, cnx->data.header.width,
>    2.                                cnx->data.header.height, 16);
>    3.
>    4.
>    5.   gdk_draw_rgb_image(cnx->pixmap,
>    6.                      cnx->window->style->fg_gc[GTK_STATE_NORMAL],
>    7.                      0, 0,
>    8.                      cnx->data.header.width,
>    9.                      cnx->data.header.height,
>    10.                      GDK_RGB_DITHER_NORMAL, cnx->data.data,
>    11.                      cnx->data.header.width * 3);
>    12.
>    13.   cnx->draw_area = gtk_image_new_from_pixmap(cnx->pixmap, NULL);
>
>
> libgtk2.0-dev  2.8.20-1
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If the goal is to create an offscreen buffer to later be blitted to a
window, you can modify line 1 & 2 to read

   1.   cnx->pixmap = gdk_pixmap_new(GDK_DRAWABLE(cnx->window->window),
   2.                                cnx->data.header.width,
cnx->data.header.height, -1);

PS, this also shows that cnx->window is a confusing name, perhaps
cnx->widget would work better.

-Jim