linux/include/drm/drm_fourcc.h
Maxime Ripard 4cc4e1b40f
drm/fourcc: Add a alpha field to drm_format_info
There's a bunch of drivers that duplicate the same function to know if a
particular format embeds an alpha component or not.

Let's create a field in the drm_format_info to avoid duplicating that logic
and looking up formats all the time.

Cc: Eric Anholt <eric@anholt.net>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/9cd9951d147ff810c1f6f68d79e7983361ed6b68.1516617243.git-series.maxime.ripard@free-electrons.com
2018-01-29 12:07:47 +01:00

76 lines
2.9 KiB
C

/*
* Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef __DRM_FOURCC_H__
#define __DRM_FOURCC_H__
#include <linux/types.h>
#include <uapi/drm/drm_fourcc.h>
struct drm_device;
struct drm_mode_fb_cmd2;
/**
* struct drm_format_info - information about a DRM format
* @format: 4CC format identifier (DRM_FORMAT_*)
* @depth: Color depth (number of bits per pixel excluding padding bits),
* valid for a subset of RGB formats only. This is a legacy field, do not
* use in new code and set to 0 for new formats.
* @num_planes: Number of color planes (1 to 3)
* @cpp: Number of bytes per pixel (per plane)
* @hsub: Horizontal chroma subsampling factor
* @vsub: Vertical chroma subsampling factor
* @has_alpha: Does the format embeds an alpha component?
*/
struct drm_format_info {
u32 format;
u8 depth;
u8 num_planes;
u8 cpp[3];
u8 hsub;
u8 vsub;
bool has_alpha;
};
/**
* struct drm_format_name_buf - name of a DRM format
* @str: string buffer containing the format name
*/
struct drm_format_name_buf {
char str[32];
};
const struct drm_format_info *__drm_format_info(u32 format);
const struct drm_format_info *drm_format_info(u32 format);
const struct drm_format_info *
drm_get_format_info(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode_cmd);
uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
int drm_format_num_planes(uint32_t format);
int drm_format_plane_cpp(uint32_t format, int plane);
int drm_format_horz_chroma_subsampling(uint32_t format);
int drm_format_vert_chroma_subsampling(uint32_t format);
int drm_format_plane_width(int width, uint32_t format, int plane);
int drm_format_plane_height(int height, uint32_t format, int plane);
const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
#endif /* __DRM_FOURCC_H__ */