/* SPDX-License-Identifier: GPL-2.0 or MIT */ #ifndef DRM_FORMAT_INTERNAL_H#define DRM_FORMAT_INTERNAL_H #include <linux/bits.h>#include <linux/types.h>#include <linux/swab.h> /* * Each pixel-format conversion helper takes a raw pixel in a * specific input format and returns a raw pixel in a specific * output format. All pixels are in little-endian byte order. * * Function names are * *   drm_pixel_<input>_to_<output>_<algorithm>() * * where <input> and <output> refer to pixel formats. The * <algorithm> is optional and hints to the method used for the * conversion. Helpers with no algorithm given apply pixel-bit * shifting. * * The argument type is u32. We expect this to be wide enough to * hold all conversion input from 32-bit RGB to any output format. * The Linux kernel should avoid format conversion for anything * but XRGB8888 input data. Converting from other format can still * be acceptable in some cases. * * The return type is u32. It is wide enough to hold all conversion * output from XRGB8888. For output formats wider than 32 bit, a * return type of u64 would be acceptable. */ /* * Conversions from XRGB8888 */ static inline u32 drm_pixel_xrgb8888_to_r8_bt601(u32 pix){	u32 r = (pix & 0x00ff0000) >> 16;	u32 g = (pix & 0x0000ff00) >> 8;	u32 b =  pix & 0x000000ff; 	/* ITU-R BT.601: Y = 0.299 R + 0.587 G + 0.114 B */	return (77 * r + 150 * g + 29 * b) / 256;} static inline u32 drm_pixel_xrgb8888_to_rgb332(u32 pix){	return ((pix & 0x00e00000) >> 16) |	       ((pix & 0x0000e000) >> 11) |	       ((pix & 0x000000c0) >> 6);} static inline u32 drm_pixel_xrgb8888_to_rgb565(u32 pix){	return ((pix & 0x00f80000) >> 8) |	       ((pix & 0x0000fc00) >> 5) |	       ((pix & 0x000000f8) >> 3);} static inline u32 drm_pixel_xrgb8888_to_rgb565be(u32 pix){	return swab16(drm_pixel_xrgb8888_to_rgb565(pix));} static inline u32 drm_pixel_xrgb8888_to_rgbx5551(u32 pix){	return ((pix & 0x00f80000) >> 8) |	       ((pix & 0x0000f800) >> 5) |	       ((pix & 0x000000f8) >> 2);} static inline u32 drm_pixel_xrgb8888_to_rgba5551(u32 pix){	return drm_pixel_xrgb8888_to_rgbx5551(pix) |	       BIT(0); /* set alpha bit */} static inline u32 drm_pixel_xrgb8888_to_xrgb1555(u32 pix){	return ((pix & 0x00f80000) >> 9) |	       ((pix & 0x0000f800) >> 6) |	       ((pix & 0x000000f8) >> 3);} static inline u32 drm_pixel_xrgb8888_to_argb1555(u32 pix){	return BIT(15) | /* set alpha bit */	       drm_pixel_xrgb8888_to_xrgb1555(pix);} static inline u32 drm_pixel_xrgb8888_to_rgb888(u32 pix){	return pix & GENMASK(23, 0);} static inline u32 drm_pixel_xrgb8888_to_bgr888(u32 pix){	return ((pix & 0x00ff0000) >> 16) |	       ((pix & 0x0000ff00)) |	       ((pix & 0x000000ff) << 16);} static inline u32 drm_pixel_xrgb8888_to_argb8888(u32 pix){	return GENMASK(31, 24) | /* fill alpha bits */	       pix;} static inline u32 drm_pixel_xrgb8888_to_xbgr8888(u32 pix){	return ((pix & 0xff000000)) | /* also copy filler bits */	       ((pix & 0x00ff0000) >> 16) |	       ((pix & 0x0000ff00)) |	       ((pix & 0x000000ff) << 16);} static inline u32 drm_pixel_xrgb8888_to_bgrx8888(u32 pix){	return ((pix & 0xff000000) >> 24) | /* also copy filler bits */	       ((pix & 0x00ff0000) >> 8) |	       ((pix & 0x0000ff00) << 8) |	       ((pix & 0x000000ff) << 24);} static inline u32 drm_pixel_xrgb8888_to_abgr8888(u32 pix){	return GENMASK(31, 24) | /* fill alpha bits */	       drm_pixel_xrgb8888_to_xbgr8888(pix);} static inline u32 drm_pixel_xrgb8888_to_xrgb2101010(u32 pix){	pix = ((pix & 0x000000ff) << 2) |	      ((pix & 0x0000ff00) << 4) |	      ((pix & 0x00ff0000) << 6);	return pix | ((pix >> 8) & 0x00300c03);} static inline u32 drm_pixel_xrgb8888_to_argb2101010(u32 pix){	return GENMASK(31, 30) | /* set alpha bits */	       drm_pixel_xrgb8888_to_xrgb2101010(pix);} static inline u32 drm_pixel_xrgb8888_to_xbgr2101010(u32 pix){	pix = ((pix & 0x00ff0000) >> 14) |	      ((pix & 0x0000ff00) << 4) |	      ((pix & 0x000000ff) << 22);	return pix | ((pix >> 8) & 0x00300c03);} static inline u32 drm_pixel_xrgb8888_to_abgr2101010(u32 pix){	return GENMASK(31, 30) | /* set alpha bits */	       drm_pixel_xrgb8888_to_xbgr2101010(pix);} /* * Conversion from ARGB8888 */ static inline u32 drm_pixel_argb8888_to_argb4444(u32 pix){	return ((pix & 0xf0000000) >> 16) |	       ((pix & 0x00f00000) >> 12) |	       ((pix & 0x0000f000) >> 8) |	       ((pix & 0x000000f0) >> 4);} #endif