mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
dc0e6e0544
Consolidate common drawing functions into a single header file. Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
379 lines
8.7 KiB
C
379 lines
8.7 KiB
C
/*
|
|
* Generic Bit Block Transfer for frame buffers located in system RAM with
|
|
* packed pixels of any depth.
|
|
*
|
|
* Based almost entirely from cfbcopyarea.c (which is based almost entirely
|
|
* on Geert Uytterhoeven's copyarea routine)
|
|
*
|
|
* Copyright (C) 2007 Antonino Daplas <adaplas@pol.net>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive for
|
|
* more details.
|
|
*
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/types.h>
|
|
#include <asm/io.h>
|
|
#include "fb_draw.h"
|
|
|
|
/*
|
|
* Generic bitwise copy algorithm
|
|
*/
|
|
|
|
static void
|
|
bitcpy(unsigned long *dst, int dst_idx, const unsigned long *src,
|
|
int src_idx, int bits, unsigned n)
|
|
{
|
|
unsigned long first, last;
|
|
int const shift = dst_idx-src_idx;
|
|
int left, right;
|
|
|
|
first = FB_SHIFT_HIGH(~0UL, dst_idx);
|
|
last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
|
|
|
|
if (!shift) {
|
|
/* Same alignment for source and dest */
|
|
if (dst_idx+n <= bits) {
|
|
/* Single word */
|
|
if (last)
|
|
first &= last;
|
|
*dst = comp(*src, *dst, first);
|
|
} else {
|
|
/* Multiple destination words */
|
|
/* Leading bits */
|
|
if (first != ~0UL) {
|
|
*dst = comp(*src, *dst, first);
|
|
dst++;
|
|
src++;
|
|
n -= bits - dst_idx;
|
|
}
|
|
|
|
/* Main chunk */
|
|
n /= bits;
|
|
while (n >= 8) {
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
n -= 8;
|
|
}
|
|
while (n--)
|
|
*dst++ = *src++;
|
|
|
|
/* Trailing bits */
|
|
if (last)
|
|
*dst = comp(*src, *dst, last);
|
|
}
|
|
} else {
|
|
unsigned long d0, d1;
|
|
int m;
|
|
|
|
/* Different alignment for source and dest */
|
|
right = shift & (bits - 1);
|
|
left = -shift & (bits - 1);
|
|
|
|
if (dst_idx+n <= bits) {
|
|
/* Single destination word */
|
|
if (last)
|
|
first &= last;
|
|
if (shift > 0) {
|
|
/* Single source word */
|
|
*dst = comp(*src >> right, *dst, first);
|
|
} else if (src_idx+n <= bits) {
|
|
/* Single source word */
|
|
*dst = comp(*src << left, *dst, first);
|
|
} else {
|
|
/* 2 source words */
|
|
d0 = *src++;
|
|
d1 = *src;
|
|
*dst = comp(d0 << left | d1 >> right, *dst,
|
|
first);
|
|
}
|
|
} else {
|
|
/* Multiple destination words */
|
|
/** We must always remember the last value read,
|
|
because in case SRC and DST overlap bitwise (e.g.
|
|
when moving just one pixel in 1bpp), we always
|
|
collect one full long for DST and that might
|
|
overlap with the current long from SRC. We store
|
|
this value in 'd0'. */
|
|
d0 = *src++;
|
|
/* Leading bits */
|
|
if (shift > 0) {
|
|
/* Single source word */
|
|
*dst = comp(d0 >> right, *dst, first);
|
|
dst++;
|
|
n -= bits - dst_idx;
|
|
} else {
|
|
/* 2 source words */
|
|
d1 = *src++;
|
|
*dst = comp(d0 << left | *dst >> right, *dst, first);
|
|
d0 = d1;
|
|
dst++;
|
|
n -= bits - dst_idx;
|
|
}
|
|
|
|
/* Main chunk */
|
|
m = n % bits;
|
|
n /= bits;
|
|
while (n >= 4) {
|
|
d1 = *src++;
|
|
*dst++ = d0 << left | d1 >> right;
|
|
d0 = d1;
|
|
d1 = *src++;
|
|
*dst++ = d0 << left | d1 >> right;
|
|
d0 = d1;
|
|
d1 = *src++;
|
|
*dst++ = d0 << left | d1 >> right;
|
|
d0 = d1;
|
|
d1 = *src++;
|
|
*dst++ = d0 << left | d1 >> right;
|
|
d0 = d1;
|
|
n -= 4;
|
|
}
|
|
while (n--) {
|
|
d1 = *src++;
|
|
*dst++ = d0 << left | d1 >> right;
|
|
d0 = d1;
|
|
}
|
|
|
|
/* Trailing bits */
|
|
if (last) {
|
|
if (m <= right) {
|
|
/* Single source word */
|
|
*dst = comp(d0 << left, *dst, last);
|
|
} else {
|
|
/* 2 source words */
|
|
d1 = *src;
|
|
*dst = comp(d0 << left | d1 >> right,
|
|
*dst, last);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Generic bitwise copy algorithm, operating backward
|
|
*/
|
|
|
|
static void
|
|
bitcpy_rev(unsigned long *dst, int dst_idx, const unsigned long *src,
|
|
int src_idx, int bits, unsigned n)
|
|
{
|
|
unsigned long first, last;
|
|
int shift;
|
|
|
|
dst += (n-1)/bits;
|
|
src += (n-1)/bits;
|
|
if ((n-1) % bits) {
|
|
dst_idx += (n-1) % bits;
|
|
dst += dst_idx >> (ffs(bits) - 1);
|
|
dst_idx &= bits - 1;
|
|
src_idx += (n-1) % bits;
|
|
src += src_idx >> (ffs(bits) - 1);
|
|
src_idx &= bits - 1;
|
|
}
|
|
|
|
shift = dst_idx-src_idx;
|
|
|
|
first = FB_SHIFT_LOW(~0UL, bits - 1 - dst_idx);
|
|
last = ~(FB_SHIFT_LOW(~0UL, bits - 1 - ((dst_idx-n) % bits)));
|
|
|
|
if (!shift) {
|
|
/* Same alignment for source and dest */
|
|
if ((unsigned long)dst_idx+1 >= n) {
|
|
/* Single word */
|
|
if (last)
|
|
first &= last;
|
|
*dst = comp(*src, *dst, first);
|
|
} else {
|
|
/* Multiple destination words */
|
|
|
|
/* Leading bits */
|
|
if (first != ~0UL) {
|
|
*dst = comp(*src, *dst, first);
|
|
dst--;
|
|
src--;
|
|
n -= dst_idx+1;
|
|
}
|
|
|
|
/* Main chunk */
|
|
n /= bits;
|
|
while (n >= 8) {
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
*dst-- = *src--;
|
|
n -= 8;
|
|
}
|
|
while (n--)
|
|
*dst-- = *src--;
|
|
/* Trailing bits */
|
|
if (last)
|
|
*dst = comp(*src, *dst, last);
|
|
}
|
|
} else {
|
|
/* Different alignment for source and dest */
|
|
|
|
int const left = -shift & (bits-1);
|
|
int const right = shift & (bits-1);
|
|
|
|
if ((unsigned long)dst_idx+1 >= n) {
|
|
/* Single destination word */
|
|
if (last)
|
|
first &= last;
|
|
if (shift < 0) {
|
|
/* Single source word */
|
|
*dst = comp(*src << left, *dst, first);
|
|
} else if (1+(unsigned long)src_idx >= n) {
|
|
/* Single source word */
|
|
*dst = comp(*src >> right, *dst, first);
|
|
} else {
|
|
/* 2 source words */
|
|
*dst = comp(*src >> right | *(src-1) << left,
|
|
*dst, first);
|
|
}
|
|
} else {
|
|
/* Multiple destination words */
|
|
/** We must always remember the last value read,
|
|
because in case SRC and DST overlap bitwise (e.g.
|
|
when moving just one pixel in 1bpp), we always
|
|
collect one full long for DST and that might
|
|
overlap with the current long from SRC. We store
|
|
this value in 'd0'. */
|
|
unsigned long d0, d1;
|
|
int m;
|
|
|
|
d0 = *src--;
|
|
/* Leading bits */
|
|
if (shift < 0) {
|
|
/* Single source word */
|
|
*dst = comp(d0 << left, *dst, first);
|
|
} else {
|
|
/* 2 source words */
|
|
d1 = *src--;
|
|
*dst = comp(d0 >> right | d1 << left, *dst,
|
|
first);
|
|
d0 = d1;
|
|
}
|
|
dst--;
|
|
n -= dst_idx+1;
|
|
|
|
/* Main chunk */
|
|
m = n % bits;
|
|
n /= bits;
|
|
while (n >= 4) {
|
|
d1 = *src--;
|
|
*dst-- = d0 >> right | d1 << left;
|
|
d0 = d1;
|
|
d1 = *src--;
|
|
*dst-- = d0 >> right | d1 << left;
|
|
d0 = d1;
|
|
d1 = *src--;
|
|
*dst-- = d0 >> right | d1 << left;
|
|
d0 = d1;
|
|
d1 = *src--;
|
|
*dst-- = d0 >> right | d1 << left;
|
|
d0 = d1;
|
|
n -= 4;
|
|
}
|
|
while (n--) {
|
|
d1 = *src--;
|
|
*dst-- = d0 >> right | d1 << left;
|
|
d0 = d1;
|
|
}
|
|
|
|
/* Trailing bits */
|
|
if (last) {
|
|
if (m <= left) {
|
|
/* Single source word */
|
|
*dst = comp(d0 >> right, *dst, last);
|
|
} else {
|
|
/* 2 source words */
|
|
d1 = *src;
|
|
*dst = comp(d0 >> right | d1 << left,
|
|
*dst, last);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void sys_copyarea(struct fb_info *p, const struct fb_copyarea *area)
|
|
{
|
|
u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
|
|
u32 height = area->height, width = area->width;
|
|
unsigned long const bits_per_line = p->fix.line_length*8u;
|
|
unsigned long *dst = NULL, *src = NULL;
|
|
int bits = BITS_PER_LONG, bytes = bits >> 3;
|
|
int dst_idx = 0, src_idx = 0, rev_copy = 0;
|
|
|
|
if (p->state != FBINFO_STATE_RUNNING)
|
|
return;
|
|
|
|
/* if the beginning of the target area might overlap with the end of
|
|
the source area, be have to copy the area reverse. */
|
|
if ((dy == sy && dx > sx) || (dy > sy)) {
|
|
dy += height;
|
|
sy += height;
|
|
rev_copy = 1;
|
|
}
|
|
|
|
/* split the base of the framebuffer into a long-aligned address and
|
|
the index of the first bit */
|
|
dst = src = (unsigned long *)((unsigned long)p->screen_base &
|
|
~(bytes-1));
|
|
dst_idx = src_idx = 8*((unsigned long)p->screen_base & (bytes-1));
|
|
/* add offset of source and target area */
|
|
dst_idx += dy*bits_per_line + dx*p->var.bits_per_pixel;
|
|
src_idx += sy*bits_per_line + sx*p->var.bits_per_pixel;
|
|
|
|
if (p->fbops->fb_sync)
|
|
p->fbops->fb_sync(p);
|
|
|
|
if (rev_copy) {
|
|
while (height--) {
|
|
dst_idx -= bits_per_line;
|
|
src_idx -= bits_per_line;
|
|
dst += dst_idx >> (ffs(bits) - 1);
|
|
dst_idx &= (bytes - 1);
|
|
src += src_idx >> (ffs(bits) - 1);
|
|
src_idx &= (bytes - 1);
|
|
bitcpy_rev(dst, dst_idx, src, src_idx, bits,
|
|
width*p->var.bits_per_pixel);
|
|
}
|
|
} else {
|
|
while (height--) {
|
|
dst += dst_idx >> (ffs(bits) - 1);
|
|
dst_idx &= (bytes - 1);
|
|
src += src_idx >> (ffs(bits) - 1);
|
|
src_idx &= (bytes - 1);
|
|
bitcpy(dst, dst_idx, src, src_idx, bits,
|
|
width*p->var.bits_per_pixel);
|
|
dst_idx += bits_per_line;
|
|
src_idx += bits_per_line;
|
|
}
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(sys_copyarea);
|
|
|
|
MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
|
|
MODULE_DESCRIPTION("Generic copyarea (sys-to-sys)");
|
|
MODULE_LICENSE("GPL");
|
|
|