nanogui: Screenshots in Nano-X
Subject:
RE: [nanogui] Screenshots in Nano-X
From:
Steven Vahl ####@####.####
Date:
28 Jan 2010 18:38:41 -0000
Message-Id: <9F69FF8A3F0CF8449F231D4324DB1B3A1B22A2E554@EX1.asdi.com>
I discovered the problem with my corrupt bitmaps. The cross-compilier I'm using for my embedded system does not support the "#pragma pack()" directive that is used around the declaration of the BMPHEAD structure in the src/engine/devopen.c file. Consequently, byte-alignment was causing the bitmap header to be written incorrectly.
I fixed the problem by adding "__attribute__((packed))" to the BMPHEAD structure declaration, which is recognized by my compiler.
I also had to make some modifications to the GdCaptureScreen() code (swapping x and y coordinates) to resolve other problems caused by the fact that I am running the nano-X server in "rotated" mode. (with the -R option.)
Thanks to all who took the time to look into this.
Steven Vahl
Scientific Programmer
ASD Inc.
2555 55th St., Ste. 100
Boulder, CO 80301 USA
(303) 444-6522 ext. 127
####@####.####
www.asdi.com
-----Original Message-----
From: Greg Haerr ####@####.####
Sent: Thursday, January 28, 2010 10:42 AM
To: Steven Vahl; ####@####.####
Subject: Re: [nanogui] Screenshots in Nano-X
> I am using Nano-X on an embedded system with a 320 x 240 display and a
> four-button keypad.
Please describe the MWPF_TRUECOLOR specification for this device, the .bmp will vary depending upon it.
> However, no bitmap editor I've tried has been able to open any of the
> screen.bmp files that are created--they all say the file is corrupt.
Please forward a .bmp to me, along with the spec for the framebuffer color format.
Take a look at the source in src/engine/devopen.c::GdCaptureScreen()
for more information.
Regards,
Greg
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