linux/drivers/video/fbdev/core/fb_draw.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FB_DRAW_H
#define _FB_DRAW_H

#include <asm/types.h>
#include <linux/fb.h>
#include <linux/bug.h>

    /*
     *  Compose two values, using a bitmask as decision value
     *  This is equivalent to (a & mask) | (b & ~mask)
     */

static inline unsigned long
comp(unsigned long a, unsigned long b, unsigned long mask)
{ … }

    /*
     *  Create a pattern with the given pixel's color
     */

#if BITS_PER_LONG == 64
static inline unsigned long
pixel_to_pat( u32 bpp, u32 pixel)
{ … }
#else
static inline unsigned long
pixel_to_pat( u32 bpp, u32 pixel)
{
	switch (bpp) {
	case 1:
		return 0xfffffffful*pixel;
	case 2:
		return 0x55555555ul*pixel;
	case 4:
		return 0x11111111ul*pixel;
	case 8:
		return 0x01010101ul*pixel;
	case 12:
		return 0x01001001ul*pixel;
	case 16:
		return 0x00010001ul*pixel;
	case 24:
		return 0x01000001ul*pixel;
	case 32:
		return 0x00000001ul*pixel;
	default:
		WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
		return 0;
    }
}
#endif

#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
#if BITS_PER_LONG == 64
#define REV_PIXELS_MASK1 …
#define REV_PIXELS_MASK2 …
#define REV_PIXELS_MASK4 …
#else
#define REV_PIXELS_MASK1 …
#define REV_PIXELS_MASK2 …
#define REV_PIXELS_MASK4 …
#endif

static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
						  u32 bswapmask)
{ … }

static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
					     u32 bswapmask)
{ … }

static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
							u32 index,
							u32 bswapmask)
{ … }


static inline u32 fb_compute_bswapmask(struct fb_info *info)
{ … }

#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */

static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
						  u32 bswapmask)
{
	return val;
}

#define fb_shifted_pixels_mask_u32 …
#define fb_shifted_pixels_mask_long …
#define fb_compute_bswapmask …

#endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */

#define cpu_to_le_long …
#define _cpu_to_le_long(x) …
#define __cpu_to_le_long(x) …

#define le_long_to_cpu …
#define _le_long_to_cpu(x) …
#define __le_long_to_cpu(x) …

static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
{ … }

#endif /* FB_DRAW_H */