1 /* 2 * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com> 3 * 4 * Permission to use, copy, modify, distribute, and sell this software and its 5 * documentation for any purpose is hereby granted without fee, provided that 6 * the above copyright notice appear in all copies and that both that copyright 7 * notice and this permission notice appear in supporting documentation, and 8 * that the name of the copyright holders not be used in advertising or 9 * publicity pertaining to distribution of the software without specific, 10 * written prior permission. The copyright holders make no representations 11 * about the suitability of this software for any purpose. It is provided "as 12 * is" without express or implied warranty. 13 * 14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 20 * OF THIS SOFTWARE. 21 */ 22 #ifndef __DRM_FOURCC_H__ 23 #define __DRM_FOURCC_H__ 24 25 #include <linux/types.h> 26 #include <uapi/drm/drm_fourcc.h> 27 28 /* 29 * DRM formats are little endian. Define host endian variants for the 30 * most common formats here, to reduce the #ifdefs needed in drivers. 31 * 32 * Note that the DRM_FORMAT_BIG_ENDIAN flag should only be used in 33 * case the format can't be specified otherwise, so we don't end up 34 * with two values describing the same format. 35 */ 36 #ifdef __BIG_ENDIAN 37 # define DRM_FORMAT_HOST_XRGB1555 (DRM_FORMAT_XRGB1555 | \ 38 DRM_FORMAT_BIG_ENDIAN) 39 # define DRM_FORMAT_HOST_RGB565 (DRM_FORMAT_RGB565 | \ 40 DRM_FORMAT_BIG_ENDIAN) 41 # define DRM_FORMAT_HOST_XRGB8888 DRM_FORMAT_BGRX8888 42 # define DRM_FORMAT_HOST_ARGB8888 DRM_FORMAT_BGRA8888 43 #else 44 # define DRM_FORMAT_HOST_XRGB1555 DRM_FORMAT_XRGB1555 45 # define DRM_FORMAT_HOST_RGB565 DRM_FORMAT_RGB565 46 # define DRM_FORMAT_HOST_XRGB8888 DRM_FORMAT_XRGB8888 47 # define DRM_FORMAT_HOST_ARGB8888 DRM_FORMAT_ARGB8888 48 #endif 49 50 struct drm_device; 51 struct drm_mode_fb_cmd2; 52 53 /** 54 * struct drm_format_info - information about a DRM format 55 */ 56 struct drm_format_info { 57 /** @format: 4CC format identifier (DRM_FORMAT_*) */ 58 u32 format; 59 60 /** 61 * @depth: 62 * 63 * Color depth (number of bits per pixel excluding padding bits), 64 * valid for a subset of RGB formats only. This is a legacy field, do 65 * not use in new code and set to 0 for new formats. 66 */ 67 u8 depth; 68 69 /** @num_planes: Number of color planes (1 to 3) */ 70 u8 num_planes; 71 72 union { 73 /** 74 * @cpp: 75 * 76 * Number of bytes per pixel (per plane), this is aliased with 77 * @char_per_block. It is deprecated in favour of using the 78 * triplet @char_per_block, @block_w, @block_h for better 79 * describing the pixel format. 80 */ 81 u8 cpp[3]; 82 83 /** 84 * @char_per_block: 85 * 86 * Number of bytes per block (per plane), where blocks are 87 * defined as a rectangle of pixels which are stored next to 88 * each other in a byte aligned memory region. Together with 89 * @block_w and @block_h this is used to properly describe tiles 90 * in tiled formats or to describe groups of pixels in packed 91 * formats for which the memory needed for a single pixel is not 92 * byte aligned. 93 * 94 * @cpp has been kept for historical reasons because there are 95 * a lot of places in drivers where it's used. In drm core for 96 * generic code paths the preferred way is to use 97 * @char_per_block, drm_format_info_block_width() and 98 * drm_format_info_block_height() which allows handling both 99 * block and non-block formats in the same way. 100 * 101 * For formats that are intended to be used only with non-linear 102 * modifiers both @cpp and @char_per_block must be 0 in the 103 * generic format table. Drivers could supply accurate 104 * information from their drm_mode_config.get_format_info hook 105 * if they want the core to be validating the pitch. 106 */ 107 u8 char_per_block[3]; 108 }; 109 110 /** 111 * @block_w: 112 * 113 * Block width in pixels, this is intended to be accessed through 114 * drm_format_info_block_width() 115 */ 116 u8 block_w[3]; 117 118 /** 119 * @block_h: 120 * 121 * Block height in pixels, this is intended to be accessed through 122 * drm_format_info_block_height() 123 */ 124 u8 block_h[3]; 125 126 /** @hsub: Horizontal chroma subsampling factor */ 127 u8 hsub; 128 /** @vsub: Vertical chroma subsampling factor */ 129 u8 vsub; 130 131 /** @has_alpha: Does the format embeds an alpha component? */ 132 bool has_alpha; 133 134 /** @is_yuv: Is it a YUV format? */ 135 bool is_yuv; 136 }; 137 138 /** 139 * struct drm_format_name_buf - name of a DRM format 140 * @str: string buffer containing the format name 141 */ 142 struct drm_format_name_buf { 143 char str[32]; 144 }; 145 146 const struct drm_format_info *__drm_format_info(u32 format); 147 const struct drm_format_info *drm_format_info(u32 format); 148 const struct drm_format_info * 149 drm_get_format_info(struct drm_device *dev, 150 const struct drm_mode_fb_cmd2 *mode_cmd); 151 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth); 152 uint32_t drm_driver_legacy_fb_format(struct drm_device *dev, 153 uint32_t bpp, uint32_t depth); 154 int drm_format_num_planes(uint32_t format); 155 int drm_format_plane_cpp(uint32_t format, int plane); 156 int drm_format_horz_chroma_subsampling(uint32_t format); 157 int drm_format_vert_chroma_subsampling(uint32_t format); 158 int drm_format_plane_width(int width, uint32_t format, int plane); 159 int drm_format_plane_height(int height, uint32_t format, int plane); 160 unsigned int drm_format_info_block_width(const struct drm_format_info *info, 161 int plane); 162 unsigned int drm_format_info_block_height(const struct drm_format_info *info, 163 int plane); 164 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info, 165 int plane, unsigned int buffer_width); 166 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf); 167 168 #endif /* __DRM_FOURCC_H__ */ 169