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 drm_pixel_xrgb8888_to_rgb565(u32 pix)38static inline u32 drm_pixel_xrgb8888_to_rgb565(u32 pix) 39 { 40 return ((pix & 0x00f80000) >> 8) | 41 ((pix & 0x0000fc00) >> 5) | 42 ((pix & 0x000000f8) >> 3); 43 } 44 drm_pixel_xrgb8888_to_rgbx5551(u32 pix)45static inline u32 drm_pixel_xrgb8888_to_rgbx5551(u32 pix) 46 { 47 return ((pix & 0x00f80000) >> 8) | 48 ((pix & 0x0000f800) >> 5) | 49 ((pix & 0x000000f8) >> 2); 50 } 51 drm_pixel_xrgb8888_to_rgba5551(u32 pix)52static inline u32 drm_pixel_xrgb8888_to_rgba5551(u32 pix) 53 { 54 return drm_pixel_xrgb8888_to_rgbx5551(pix) | 55 BIT(0); /* set alpha bit */ 56 } 57 drm_pixel_xrgb8888_to_xrgb1555(u32 pix)58static inline u32 drm_pixel_xrgb8888_to_xrgb1555(u32 pix) 59 { 60 return ((pix & 0x00f80000) >> 9) | 61 ((pix & 0x0000f800) >> 6) | 62 ((pix & 0x000000f8) >> 3); 63 } 64 drm_pixel_xrgb8888_to_argb1555(u32 pix)65static inline u32 drm_pixel_xrgb8888_to_argb1555(u32 pix) 66 { 67 return BIT(15) | /* set alpha bit */ 68 drm_pixel_xrgb8888_to_xrgb1555(pix); 69 } 70 drm_pixel_xrgb8888_to_argb8888(u32 pix)71static inline u32 drm_pixel_xrgb8888_to_argb8888(u32 pix) 72 { 73 return GENMASK(31, 24) | /* fill alpha bits */ 74 pix; 75 } 76 drm_pixel_xrgb8888_to_xbgr8888(u32 pix)77static inline u32 drm_pixel_xrgb8888_to_xbgr8888(u32 pix) 78 { 79 return ((pix & 0xff000000)) | /* also copy filler bits */ 80 ((pix & 0x00ff0000) >> 16) | 81 ((pix & 0x0000ff00)) | 82 ((pix & 0x000000ff) << 16); 83 } 84 drm_pixel_xrgb8888_to_bgrx8888(u32 pix)85static inline u32 drm_pixel_xrgb8888_to_bgrx8888(u32 pix) 86 { 87 return ((pix & 0xff000000) >> 24) | /* also copy filler bits */ 88 ((pix & 0x00ff0000) >> 8) | 89 ((pix & 0x0000ff00) << 8) | 90 ((pix & 0x000000ff) << 24); 91 } 92 drm_pixel_xrgb8888_to_abgr8888(u32 pix)93static inline u32 drm_pixel_xrgb8888_to_abgr8888(u32 pix) 94 { 95 return GENMASK(31, 24) | /* fill alpha bits */ 96 drm_pixel_xrgb8888_to_xbgr8888(pix); 97 } 98 drm_pixel_xrgb8888_to_xrgb2101010(u32 pix)99static inline u32 drm_pixel_xrgb8888_to_xrgb2101010(u32 pix) 100 { 101 pix = ((pix & 0x000000ff) << 2) | 102 ((pix & 0x0000ff00) << 4) | 103 ((pix & 0x00ff0000) << 6); 104 return pix | ((pix >> 8) & 0x00300c03); 105 } 106 drm_pixel_xrgb8888_to_argb2101010(u32 pix)107static inline u32 drm_pixel_xrgb8888_to_argb2101010(u32 pix) 108 { 109 return GENMASK(31, 30) | /* set alpha bits */ 110 drm_pixel_xrgb8888_to_xrgb2101010(pix); 111 } 112 drm_pixel_xrgb8888_to_xbgr2101010(u32 pix)113static inline u32 drm_pixel_xrgb8888_to_xbgr2101010(u32 pix) 114 { 115 pix = ((pix & 0x00ff0000) >> 14) | 116 ((pix & 0x0000ff00) << 4) | 117 ((pix & 0x000000ff) << 22); 118 return pix | ((pix >> 8) & 0x00300c03); 119 } 120 drm_pixel_xrgb8888_to_abgr2101010(u32 pix)121static inline u32 drm_pixel_xrgb8888_to_abgr2101010(u32 pix) 122 { 123 return GENMASK(31, 30) | /* set alpha bits */ 124 drm_pixel_xrgb8888_to_xbgr2101010(pix); 125 } 126 127 #endif 128