Documentation/fb/api.rst

9 ---------------
12 with frame buffer devices. In-kernel APIs between device drivers and the frame
22 ---------------
24 Device and driver capabilities are reported in the fixed screen information
36 - FB_CAP_FOURCC
40 specifying color components layout.
44 --------------------
46 Pixels are stored in memory in hardware-dependent formats. Applications need
58 - FB_TYPE_PACKED_PIXELS
64 Padding at end of lines may be present and is then reported through the fixed
67 - FB_TYPE_PLANES
75 - FB_TYPE_INTERLEAVED_PLANES
83 belonging to different planes, is stored in the fixed screen information
86 - FB_TYPE_FOURCC
91 - FB_VISUAL_MONO01
102 - FB_VISUAL_MONO10
113 - FB_VISUAL_TRUECOLOR
116 indexes a read-only lookup table for the corresponding value. Lookup tables
117 are device-dependent, and provide linear or non-linear ramps.
122 - FB_VISUAL_PSEUDOCOLOR and FB_VISUAL_STATIC_PSEUDOCOLOR
125 blue components. The colormap is read-only for FB_VISUAL_STATIC_PSEUDOCOLOR
126 and read-write for FB_VISUAL_PSEUDOCOLOR.
131 - FB_VISUAL_DIRECTCOLOR
139 - FB_VISUAL_FOURCC
146 ---------------------
218 	__u32 colorspace;		/* colorspace for FOURCC-based modes */
224 successful, the driver will update the fixed screen information accordingly.
232 -----------------------
235 legacy API and the FOURCC-based API.
241 non-standard formats.
247 - For grayscale formats, applications set the grayscale field to one. The red,
252 - For pseudocolor formats, applications set the grayscale field to zero. The
257 - For truecolor and directcolor formats, applications set the grayscale field
258   to zero, and the red, blue, green and transp fields to describe the layout of
268   Pixel values are bits_per_pixel wide and are split in non-overlapping red,
281 The FOURCC-based API replaces format descriptions by four character codes
284 formats. Drivers are also encouraged to implement the FOURCC-based API for RGB
287 Drivers that support the FOURCC-based API report this capability by setting
293 available in Documentation/userspace-api/media/v4l/pixfmt.rst.
298 documented in Documentation/userspace-api/media/v4l/colorspaces.rst.
300 The red, green, blue and transp fields are not used with the FOURCC-based API.