1 /* SPDX-License-Identifier: GPL-2.0 or MIT */ 2 3 #ifndef DRM_FORMAT_INTERNAL_H 4 #define DRM_FORMAT_INTERNAL_H 5 6 #include <linux/bits.h> 7 #include <linux/types.h> 8 #include <linux/swab.h> 9 10 /* 11 * Each pixel-format conversion helper takes a raw pixel in a 12 * specific input format and returns a raw pixel in a specific 13 * output format. All pixels are in little-endian byte order. 14 * 15 * Function names are 16 * 17 * drm_pixel_<input>_to_<output>_<algorithm>() 18 * 19 * where <input> and <output> refer to pixel formats. The 20 * <algorithm> is optional and hints to the method used for the 21 * conversion. Helpers with no algorithm given apply pixel-bit 22 * shifting. 23 * 24 * The argument type is u32. We expect this to be wide enough to 25 * hold all conversion input from 32-bit RGB to any output format. 26 * The Linux kernel should avoid format conversion for anything 27 * but XRGB8888 input data. Converting from other format can still 28 * be acceptable in some cases. 29 * 30 * The return type is u32. It is wide enough to hold all conversion 31 * output from XRGB8888. For output formats wider than 32 bit, a 32 * return type of u64 would be acceptable. 33 */ 34 35 /* 36 * Conversions from XRGB8888 37 */ 38 drm_pixel_xrgb8888_to_r8_bt601(u32 pix)39static inline u32 drm_pixel_xrgb8888_to_r8_bt601(u32 pix) 40 { 41 u32 r = (pix & 0x00ff0000) >> 16; 42 u32 g = (pix & 0x0000ff00) >> 8; 43 u32 b = pix & 0x000000ff; 44 45 /* ITU-R BT.601: Y = 0.299 R + 0.587 G + 0.114 B */ 46 return (77 * r + 150 * g + 29 * b) / 256; 47 } 48 drm_pixel_xrgb8888_to_rgb332(u32 pix)49static inline u32 drm_pixel_xrgb8888_to_rgb332(u32 pix) 50 { 51 return ((pix & 0x00e00000) >> 16) | 52 ((pix & 0x0000e000) >> 11) | 53 ((pix & 0x000000c0) >> 6); 54 } 55 drm_pixel_xrgb8888_to_rgb565(u32 pix)56static inline u32 drm_pixel_xrgb8888_to_rgb565(u32 pix) 57 { 58 return ((pix & 0x00f80000) >> 8) | 59 ((pix & 0x0000fc00) >> 5) | 60 ((pix & 0x000000f8) >> 3); 61 } 62 drm_pixel_xrgb8888_to_rgb565be(u32 pix)63static inline u32 drm_pixel_xrgb8888_to_rgb565be(u32 pix) 64 { 65 return swab16(drm_pixel_xrgb8888_to_rgb565(pix)); 66 } 67 drm_pixel_xrgb8888_to_rgbx5551(u32 pix)68static inline u32 drm_pixel_xrgb8888_to_rgbx5551(u32 pix) 69 { 70 return ((pix & 0x00f80000) >> 8) | 71 ((pix & 0x0000f800) >> 5) | 72 ((pix & 0x000000f8) >> 2); 73 } 74 drm_pixel_xrgb8888_to_rgba5551(u32 pix)75static inline u32 drm_pixel_xrgb8888_to_rgba5551(u32 pix) 76 { 77 return drm_pixel_xrgb8888_to_rgbx5551(pix) | 78 BIT(0); /* set alpha bit */ 79 } 80 drm_pixel_xrgb8888_to_xrgb1555(u32 pix)81static inline u32 drm_pixel_xrgb8888_to_xrgb1555(u32 pix) 82 { 83 return ((pix & 0x00f80000) >> 9) | 84 ((pix & 0x0000f800) >> 6) | 85 ((pix & 0x000000f8) >> 3); 86 } 87 drm_pixel_xrgb8888_to_argb1555(u32 pix)88static inline u32 drm_pixel_xrgb8888_to_argb1555(u32 pix) 89 { 90 return BIT(15) | /* set alpha bit */ 91 drm_pixel_xrgb8888_to_xrgb1555(pix); 92 } 93 drm_pixel_xrgb8888_to_rgb888(u32 pix)94static inline u32 drm_pixel_xrgb8888_to_rgb888(u32 pix) 95 { 96 return pix & GENMASK(23, 0); 97 } 98 drm_pixel_xrgb8888_to_bgr888(u32 pix)99static inline u32 drm_pixel_xrgb8888_to_bgr888(u32 pix) 100 { 101 return ((pix & 0x00ff0000) >> 16) | 102 ((pix & 0x0000ff00)) | 103 ((pix & 0x000000ff) << 16); 104 } 105 drm_pixel_xrgb8888_to_argb8888(u32 pix)106static inline u32 drm_pixel_xrgb8888_to_argb8888(u32 pix) 107 { 108 return GENMASK(31, 24) | /* fill alpha bits */ 109 pix; 110 } 111 drm_pixel_xrgb8888_to_xbgr8888(u32 pix)112static inline u32 drm_pixel_xrgb8888_to_xbgr8888(u32 pix) 113 { 114 return ((pix & 0xff000000)) | /* also copy filler bits */ 115 ((pix & 0x00ff0000) >> 16) | 116 ((pix & 0x0000ff00)) | 117 ((pix & 0x000000ff) << 16); 118 } 119 drm_pixel_xrgb8888_to_bgrx8888(u32 pix)120static inline u32 drm_pixel_xrgb8888_to_bgrx8888(u32 pix) 121 { 122 return ((pix & 0xff000000) >> 24) | /* also copy filler bits */ 123 ((pix & 0x00ff0000) >> 8) | 124 ((pix & 0x0000ff00) << 8) | 125 ((pix & 0x000000ff) << 24); 126 } 127 drm_pixel_xrgb8888_to_abgr8888(u32 pix)128static inline u32 drm_pixel_xrgb8888_to_abgr8888(u32 pix) 129 { 130 return GENMASK(31, 24) | /* fill alpha bits */ 131 drm_pixel_xrgb8888_to_xbgr8888(pix); 132 } 133 drm_pixel_xrgb8888_to_xrgb2101010(u32 pix)134static inline u32 drm_pixel_xrgb8888_to_xrgb2101010(u32 pix) 135 { 136 pix = ((pix & 0x000000ff) << 2) | 137 ((pix & 0x0000ff00) << 4) | 138 ((pix & 0x00ff0000) << 6); 139 return pix | ((pix >> 8) & 0x00300c03); 140 } 141 drm_pixel_xrgb8888_to_argb2101010(u32 pix)142static inline u32 drm_pixel_xrgb8888_to_argb2101010(u32 pix) 143 { 144 return GENMASK(31, 30) | /* set alpha bits */ 145 drm_pixel_xrgb8888_to_xrgb2101010(pix); 146 } 147 drm_pixel_xrgb8888_to_xbgr2101010(u32 pix)148static inline u32 drm_pixel_xrgb8888_to_xbgr2101010(u32 pix) 149 { 150 pix = ((pix & 0x00ff0000) >> 14) | 151 ((pix & 0x0000ff00) << 4) | 152 ((pix & 0x000000ff) << 22); 153 return pix | ((pix >> 8) & 0x00300c03); 154 } 155 drm_pixel_xrgb8888_to_abgr2101010(u32 pix)156static inline u32 drm_pixel_xrgb8888_to_abgr2101010(u32 pix) 157 { 158 return GENMASK(31, 30) | /* set alpha bits */ 159 drm_pixel_xrgb8888_to_xbgr2101010(pix); 160 } 161 162 /* 163 * Conversion from ARGB8888 164 */ 165 drm_pixel_argb8888_to_argb4444(u32 pix)166static inline u32 drm_pixel_argb8888_to_argb4444(u32 pix) 167 { 168 return ((pix & 0xf0000000) >> 16) | 169 ((pix & 0x00f00000) >> 12) | 170 ((pix & 0x0000f000) >> 8) | 171 ((pix & 0x000000f0) >> 4); 172 } 173 174 #endif 175