[Mesa-dev] Question in wsi_common_x11.c

[vivek pandya]

Hello,

In the following code why mage->base.row_pitches[0] is divided by 4 and
passed as width to xcb_put_function() ?

26 static VkResult
  25 x11_present_to_x11_sw(struct x11_swapchain *chain, uint32_t
image_index,
...
  15
  14    cookie = xcb_put_image(chain->conn, XCB_IMAGE_FORMAT_Z_PIXMAP,
  13                           chain->window,
  12                           chain->gc,
  11               image->base.row_pitches[0] / 4,
  10                           chain->extent.height,
   9                           0,0,0,24,
   8                           image->base.row_pitches[0] *
chain->extent.height,
   7                           myptr);

Thanks,
Vivek
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