318 строки
13 KiB
C
318 строки
13 KiB
C
/*
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* Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* DRM core format related functions
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <linux/bug.h>
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#include <linux/ctype.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <drm/drmP.h>
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#include <drm/drm_fourcc.h>
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static char printable_char(int c)
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{
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return isascii(c) && isprint(c) ? c : '?';
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}
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/**
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* drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
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* @bpp: bits per pixels
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* @depth: bit depth per pixel
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*
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* Computes a drm fourcc pixel format code for the given @bpp/@depth values.
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* Useful in fbdev emulation code, since that deals in those values.
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*/
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uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
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{
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uint32_t fmt;
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switch (bpp) {
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case 8:
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fmt = DRM_FORMAT_C8;
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break;
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case 16:
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if (depth == 15)
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fmt = DRM_FORMAT_XRGB1555;
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else
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fmt = DRM_FORMAT_RGB565;
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break;
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case 24:
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fmt = DRM_FORMAT_RGB888;
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break;
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case 32:
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if (depth == 24)
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fmt = DRM_FORMAT_XRGB8888;
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else if (depth == 30)
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fmt = DRM_FORMAT_XRGB2101010;
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else
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fmt = DRM_FORMAT_ARGB8888;
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break;
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default:
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DRM_ERROR("bad bpp, assuming x8r8g8b8 pixel format\n");
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fmt = DRM_FORMAT_XRGB8888;
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break;
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}
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return fmt;
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}
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EXPORT_SYMBOL(drm_mode_legacy_fb_format);
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/**
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* drm_get_format_name - fill a string with a drm fourcc format's name
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* @format: format to compute name of
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* @buf: caller-supplied buffer
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*/
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const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
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{
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snprintf(buf->str, sizeof(buf->str),
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"%c%c%c%c %s-endian (0x%08x)",
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printable_char(format & 0xff),
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printable_char((format >> 8) & 0xff),
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printable_char((format >> 16) & 0xff),
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printable_char((format >> 24) & 0x7f),
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format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
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format);
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return buf->str;
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}
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EXPORT_SYMBOL(drm_get_format_name);
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/*
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* Internal function to query information for a given format. See
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* drm_format_info() for the public API.
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*/
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const struct drm_format_info *__drm_format_info(u32 format)
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{
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static const struct drm_format_info formats[] = {
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{ .format = DRM_FORMAT_C8, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGB332, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGR233, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XRGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XBGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ARGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ABGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XRGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XBGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ARGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ABGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGB565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGR565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGB888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGR888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XRGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_XBGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ARGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ABGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_RGBA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_BGRA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_YUV410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4 },
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{ .format = DRM_FORMAT_YVU410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4 },
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{ .format = DRM_FORMAT_YUV411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1 },
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{ .format = DRM_FORMAT_YVU411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1 },
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{ .format = DRM_FORMAT_YUV420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2 },
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{ .format = DRM_FORMAT_YVU420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2 },
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{ .format = DRM_FORMAT_YUV422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_YVU422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_YUV444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_YVU444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_NV12, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
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{ .format = DRM_FORMAT_NV21, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
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{ .format = DRM_FORMAT_NV16, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_NV61, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_NV24, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_NV42, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1 },
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{ .format = DRM_FORMAT_YUYV, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_YVYU, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_UYVY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_VYUY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
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{ .format = DRM_FORMAT_AYUV, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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};
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(formats); ++i) {
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if (formats[i].format == format)
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return &formats[i];
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}
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return NULL;
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}
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/**
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* drm_format_info - query information for a given format
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* @format: pixel format (DRM_FORMAT_*)
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*
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* The caller should only pass a supported pixel format to this function.
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* Unsupported pixel formats will generate a warning in the kernel log.
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*
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* Returns:
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* The instance of struct drm_format_info that describes the pixel format, or
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* NULL if the format is unsupported.
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*/
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const struct drm_format_info *drm_format_info(u32 format)
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{
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const struct drm_format_info *info;
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info = __drm_format_info(format);
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WARN_ON(!info);
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return info;
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}
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EXPORT_SYMBOL(drm_format_info);
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/**
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* drm_format_num_planes - get the number of planes for format
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* @format: pixel format (DRM_FORMAT_*)
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*
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* Returns:
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* The number of planes used by the specified pixel format.
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*/
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int drm_format_num_planes(uint32_t format)
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{
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const struct drm_format_info *info;
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info = drm_format_info(format);
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return info ? info->num_planes : 1;
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}
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EXPORT_SYMBOL(drm_format_num_planes);
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/**
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* drm_format_plane_cpp - determine the bytes per pixel value
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* @format: pixel format (DRM_FORMAT_*)
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* @plane: plane index
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*
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* Returns:
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* The bytes per pixel value for the specified plane.
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*/
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int drm_format_plane_cpp(uint32_t format, int plane)
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{
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const struct drm_format_info *info;
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info = drm_format_info(format);
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if (!info || plane >= info->num_planes)
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return 0;
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return info->cpp[plane];
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}
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EXPORT_SYMBOL(drm_format_plane_cpp);
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/**
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* drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
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* @format: pixel format (DRM_FORMAT_*)
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*
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* Returns:
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* The horizontal chroma subsampling factor for the
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* specified pixel format.
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*/
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int drm_format_horz_chroma_subsampling(uint32_t format)
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{
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const struct drm_format_info *info;
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info = drm_format_info(format);
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return info ? info->hsub : 1;
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}
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EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
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/**
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* drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
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* @format: pixel format (DRM_FORMAT_*)
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*
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* Returns:
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* The vertical chroma subsampling factor for the
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* specified pixel format.
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*/
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int drm_format_vert_chroma_subsampling(uint32_t format)
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{
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const struct drm_format_info *info;
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info = drm_format_info(format);
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return info ? info->vsub : 1;
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}
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EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
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/**
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* drm_format_plane_width - width of the plane given the first plane
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* @width: width of the first plane
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* @format: pixel format
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* @plane: plane index
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*
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* Returns:
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* The width of @plane, given that the width of the first plane is @width.
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*/
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int drm_format_plane_width(int width, uint32_t format, int plane)
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{
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const struct drm_format_info *info;
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info = drm_format_info(format);
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if (!info || plane >= info->num_planes)
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return 0;
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if (plane == 0)
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return width;
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return width / info->hsub;
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}
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EXPORT_SYMBOL(drm_format_plane_width);
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/**
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* drm_format_plane_height - height of the plane given the first plane
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* @height: height of the first plane
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* @format: pixel format
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* @plane: plane index
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*
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* Returns:
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* The height of @plane, given that the height of the first plane is @height.
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*/
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int drm_format_plane_height(int height, uint32_t format, int plane)
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{
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const struct drm_format_info *info;
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info = drm_format_info(format);
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if (!info || plane >= info->num_planes)
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return 0;
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if (plane == 0)
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return height;
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return height / info->vsub;
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}
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EXPORT_SYMBOL(drm_format_plane_height);
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