Is select_format() function called from gdk_x11_draw_pixbuf() is assuming the in memory data format as ABGR always??

[prudhvi raj <prudhviraj v gmail com>]

Hi,

Can any one explain why the select_format() function called from gdk_x11_draw_pixbuf() is always checking for ABGR XRenderPictFormat before checking for ARGB??

If i am not wrong, the select_format() function is supposed to return the XRenderPictFormat that matches with the color format of the source image supplied by GdkPixbuf.

When i am trying to analyze the format values returned by this select_format() function with different JPEG/PNG/TIFF images with various color formats (ARGB, ABGR, XBGR etc), irrespective of the format in which the actual image data is arranged, select_format() always checks for the ABGR format only and returns the GDK_X11_FORMAT_EXACT_MASK as format_type. In no case, it returns ARGB. 

I tried changing the image raw data from ABGR to ARGB at gdk_image_loader end, but still select_format() returns ABGR only.

Is this format selection order is implemented assuming the src_image format would always be ABGR only??

My requirement is to convert image with any color format to ARGB before it is supplied XRenderComposite() called from draw_with_images() in gdkdrawable-x11.c

But default behaviour in gtk+-2.18.9 the above mentioned function is always giving data in ABGR format only.

Can some one explain the reason behind this XRenderPictFormat selection??