Re: how to display a XImage with 16bits depth in a drawable with a depth of 24bits ?
Citēju hd h.dupon...@laposte.net: Glynn Clements a écrit : hd wrote: I my app, I receive a raw image in 16 bits depth. My defaut visual have a depth of 24 bits (and all other Visual have 24 or 32bits depth on my X server). To display the bitmap I try to create an XImage with XCreateImage() and display it with XPutImage(). But X displays a bad match error If I try to display a raw image with the same depth (24bits) as the visual (24bits), my app works. Question : XImage APIs (XCreateImage() / XPutImage() / ...) can convert 'on the fly' the depth of the bitmap to match the visual depth or must I convert myself the raw bitmap to match the visual depth ? (convert each pixel from 16bits to 24 bits) You must convert yourself, or use a higher-level interface. The core X protocol doesn't do format conversions. If you want the conversion to be done in hardware, look at OpenGL or XRender. It's implementation-dependent whether either of these supports a specific format (other than 24-bit RGB), so you still need to provide a software conversion. It is done in the xloadimage source: ftp://ftp.x.org/R5contrib/xloadimage.4.1.tar.gz Aivils thanks a lot for your help. regards ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: how to display a XImage with 16bits depth in a drawable with a depth of 24bits ?
Glynn Clements a écrit : hd wrote: I my app, I receive a raw image in 16 bits depth. My defaut visual have a depth of 24 bits (and all other Visual have 24 or 32bits depth on my X server). To display the bitmap I try to create an XImage with XCreateImage() and display it with XPutImage(). But X displays a bad match error If I try to display a raw image with the same depth (24bits) as the visual (24bits), my app works. Question : XImage APIs (XCreateImage() / XPutImage() / ...) can convert 'on the fly' the depth of the bitmap to match the visual depth or must I convert myself the raw bitmap to match the visual depth ? (convert each pixel from 16bits to 24 bits) You must convert yourself, or use a higher-level interface. The core X protocol doesn't do format conversions. If you want the conversion to be done in hardware, look at OpenGL or XRender. It's implementation-dependent whether either of these supports a specific format (other than 24-bit RGB), so you still need to provide a software conversion. thanks a lot for your help. regards ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: how to display a XImage with 16bits depth in a drawable with a depth of 24bits ?
hd wrote: I my app, I receive a raw image in 16 bits depth. My defaut visual have a depth of 24 bits (and all other Visual have 24 or 32bits depth on my X server). To display the bitmap I try to create an XImage with XCreateImage() and display it with XPutImage(). But X displays a bad match error If I try to display a raw image with the same depth (24bits) as the visual (24bits), my app works. Question : XImage APIs (XCreateImage() / XPutImage() / ...) can convert 'on the fly' the depth of the bitmap to match the visual depth or must I convert myself the raw bitmap to match the visual depth ? (convert each pixel from 16bits to 24 bits) You must convert yourself, or use a higher-level interface. The core X protocol doesn't do format conversions. If you want the conversion to be done in hardware, look at OpenGL or XRender. It's implementation-dependent whether either of these supports a specific format (other than 24-bit RGB), so you still need to provide a software conversion. -- Glynn Clements gl...@gclements.plus.com ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
