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