321 lines
7.8 KiB
C
321 lines
7.8 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_get_format_name - return a string for drm fourcc format
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* @format: format to compute name of
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*
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* Note that the buffer used by this function is globally shared and owned by
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* the function itself.
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*
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* FIXME: This isn't really multithreading safe.
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*/
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const char *drm_get_format_name(uint32_t format)
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{
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static char buf[32];
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snprintf(buf, sizeof(buf),
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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;
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}
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EXPORT_SYMBOL(drm_get_format_name);
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/**
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* drm_fb_get_bpp_depth - get the bpp/depth values for format
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* @format: pixel format (DRM_FORMAT_*)
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* @depth: storage for the depth value
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* @bpp: storage for the bpp value
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*
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* This only supports RGB formats here for compat with code that doesn't use
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* pixel formats directly yet.
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*/
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void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
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int *bpp)
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{
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switch (format) {
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case DRM_FORMAT_C8:
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case DRM_FORMAT_RGB332:
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case DRM_FORMAT_BGR233:
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*depth = 8;
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*bpp = 8;
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break;
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case DRM_FORMAT_XRGB1555:
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case DRM_FORMAT_XBGR1555:
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case DRM_FORMAT_RGBX5551:
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case DRM_FORMAT_BGRX5551:
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case DRM_FORMAT_ARGB1555:
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case DRM_FORMAT_ABGR1555:
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case DRM_FORMAT_RGBA5551:
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case DRM_FORMAT_BGRA5551:
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*depth = 15;
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*bpp = 16;
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break;
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case DRM_FORMAT_RGB565:
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case DRM_FORMAT_BGR565:
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*depth = 16;
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*bpp = 16;
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break;
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case DRM_FORMAT_RGB888:
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case DRM_FORMAT_BGR888:
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*depth = 24;
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*bpp = 24;
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break;
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case DRM_FORMAT_XRGB8888:
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case DRM_FORMAT_XBGR8888:
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case DRM_FORMAT_RGBX8888:
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case DRM_FORMAT_BGRX8888:
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*depth = 24;
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*bpp = 32;
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break;
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case DRM_FORMAT_XRGB2101010:
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case DRM_FORMAT_XBGR2101010:
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case DRM_FORMAT_RGBX1010102:
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case DRM_FORMAT_BGRX1010102:
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case DRM_FORMAT_ARGB2101010:
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case DRM_FORMAT_ABGR2101010:
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case DRM_FORMAT_RGBA1010102:
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case DRM_FORMAT_BGRA1010102:
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*depth = 30;
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*bpp = 32;
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break;
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case DRM_FORMAT_ARGB8888:
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case DRM_FORMAT_ABGR8888:
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case DRM_FORMAT_RGBA8888:
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case DRM_FORMAT_BGRA8888:
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*depth = 32;
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*bpp = 32;
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break;
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default:
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DRM_DEBUG_KMS("unsupported pixel format %s\n",
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drm_get_format_name(format));
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*depth = 0;
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*bpp = 0;
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break;
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}
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}
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EXPORT_SYMBOL(drm_fb_get_bpp_depth);
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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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switch (format) {
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case DRM_FORMAT_YUV410:
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case DRM_FORMAT_YVU410:
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case DRM_FORMAT_YUV411:
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case DRM_FORMAT_YVU411:
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case DRM_FORMAT_YUV420:
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case DRM_FORMAT_YVU420:
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case DRM_FORMAT_YUV422:
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case DRM_FORMAT_YVU422:
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case DRM_FORMAT_YUV444:
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case DRM_FORMAT_YVU444:
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return 3;
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case DRM_FORMAT_NV12:
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case DRM_FORMAT_NV21:
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case DRM_FORMAT_NV16:
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case DRM_FORMAT_NV61:
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case DRM_FORMAT_NV24:
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case DRM_FORMAT_NV42:
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return 2;
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default:
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return 1;
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}
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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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unsigned int depth;
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int bpp;
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if (plane >= drm_format_num_planes(format))
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return 0;
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switch (format) {
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case DRM_FORMAT_YUYV:
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case DRM_FORMAT_YVYU:
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case DRM_FORMAT_UYVY:
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case DRM_FORMAT_VYUY:
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return 2;
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case DRM_FORMAT_NV12:
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case DRM_FORMAT_NV21:
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case DRM_FORMAT_NV16:
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case DRM_FORMAT_NV61:
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case DRM_FORMAT_NV24:
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case DRM_FORMAT_NV42:
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return plane ? 2 : 1;
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case DRM_FORMAT_YUV410:
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case DRM_FORMAT_YVU410:
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case DRM_FORMAT_YUV411:
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case DRM_FORMAT_YVU411:
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case DRM_FORMAT_YUV420:
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case DRM_FORMAT_YVU420:
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case DRM_FORMAT_YUV422:
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case DRM_FORMAT_YVU422:
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case DRM_FORMAT_YUV444:
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case DRM_FORMAT_YVU444:
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return 1;
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default:
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drm_fb_get_bpp_depth(format, &depth, &bpp);
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return bpp >> 3;
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}
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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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switch (format) {
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case DRM_FORMAT_YUV411:
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case DRM_FORMAT_YVU411:
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case DRM_FORMAT_YUV410:
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case DRM_FORMAT_YVU410:
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return 4;
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case DRM_FORMAT_YUYV:
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case DRM_FORMAT_YVYU:
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case DRM_FORMAT_UYVY:
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case DRM_FORMAT_VYUY:
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case DRM_FORMAT_NV12:
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case DRM_FORMAT_NV21:
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case DRM_FORMAT_NV16:
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case DRM_FORMAT_NV61:
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case DRM_FORMAT_YUV422:
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case DRM_FORMAT_YVU422:
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case DRM_FORMAT_YUV420:
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case DRM_FORMAT_YVU420:
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return 2;
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default:
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return 1;
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}
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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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switch (format) {
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case DRM_FORMAT_YUV410:
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case DRM_FORMAT_YVU410:
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return 4;
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case DRM_FORMAT_YUV420:
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case DRM_FORMAT_YVU420:
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case DRM_FORMAT_NV12:
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case DRM_FORMAT_NV21:
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return 2;
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default:
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return 1;
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}
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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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if (plane >= drm_format_num_planes(format))
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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 / drm_format_horz_chroma_subsampling(format);
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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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if (plane >= drm_format_num_planes(format))
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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 / drm_format_vert_chroma_subsampling(format);
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}
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EXPORT_SYMBOL(drm_format_plane_height);
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