Documentation/fb/api.rst

11 This document describes the frame buffer API used by applications to interact
17 the recommended API implementation, but applications should be prepared to
148 Screen information are queried by applications using the FBIOGET_FSCREENINFO
154 be directly modified by applications, but can be changed by the driver when an
222 To modify variable information, applications call the FBIOPUT_VSCREENINFO
227 applications should call the FBIOGET_VSCREENINFO ioctl and modify only the
240 for applications when using RGB and grayscale formats, as well as legacy
243 To select a format, applications set the fb_var_screeninfo bits_per_pixel field
247 - For grayscale formats, applications set the grayscale field to one. The red,
248   blue, green and transp fields must be set to 0 by applications and ignored by
252 - For pseudocolor formats, applications set the grayscale field to zero. The
253   red, blue, green and transp fields must be set to 0 by applications and
257 - For truecolor and directcolor formats, applications set the grayscale field
295 To select a format, applications set the grayscale field to the desired FOURCC.
301 For forward compatibility reasons applications must zero those fields, and