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bdca0f9b1e
The software fillrect routines do not work properly when the number of pixels per machine word is not an integer. To see that, run the following command on a fbdev console with a 24bpp video mode, using a non-accelerated driver such as (u)vesafb: reset ; echo -e '\e[41mtest\e[K' The expected result is 'test' displayed on a line with red background. Instead of that, 'test' has a red background, but the rest of the line (rendered using fillrect()) contains a distored colorful pattern. This patch fixes the problem by correctly computing rotation shifts. It has been tested in a 24bpp mode on 32- and 64-bit little-endian machines. Signed-off-by: Michal Januszewski <spock@gentoo.org> Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
336 lines
7.5 KiB
C
336 lines
7.5 KiB
C
/*
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* Generic fillrect for frame buffers in system RAM with packed pixels of
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* any depth.
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*
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* Based almost entirely from cfbfillrect.c (which is based almost entirely
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* on Geert Uytterhoeven's fillrect routine)
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*
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* Copyright (C) 2007 Antonino Daplas <adaplas@pol.net>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fb.h>
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#include <asm/types.h>
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#include "fb_draw.h"
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/*
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* Aligned pattern fill using 32/64-bit memory accesses
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*/
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static void
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bitfill_aligned(struct fb_info *p, unsigned long *dst, int dst_idx,
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unsigned long pat, unsigned n, int bits)
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{
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unsigned long first, last;
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if (!n)
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return;
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first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
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if (dst_idx+n <= bits) {
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/* Single word */
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if (last)
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first &= last;
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*dst = comp(pat, *dst, first);
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} else {
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/* Multiple destination words */
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/* Leading bits */
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if (first!= ~0UL) {
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*dst = comp(pat, *dst, first);
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dst++;
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n -= bits - dst_idx;
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}
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/* Main chunk */
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n /= bits;
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while (n >= 8) {
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*dst++ = pat;
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*dst++ = pat;
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*dst++ = pat;
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*dst++ = pat;
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*dst++ = pat;
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*dst++ = pat;
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*dst++ = pat;
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*dst++ = pat;
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n -= 8;
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}
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while (n--)
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*dst++ = pat;
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/* Trailing bits */
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if (last)
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*dst = comp(pat, *dst, last);
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}
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}
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/*
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* Unaligned generic pattern fill using 32/64-bit memory accesses
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* The pattern must have been expanded to a full 32/64-bit value
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* Left/right are the appropriate shifts to convert to the pattern to be
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* used for the next 32/64-bit word
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*/
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static void
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bitfill_unaligned(struct fb_info *p, unsigned long *dst, int dst_idx,
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unsigned long pat, int left, int right, unsigned n, int bits)
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{
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unsigned long first, last;
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if (!n)
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return;
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first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
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if (dst_idx+n <= bits) {
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/* Single word */
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if (last)
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first &= last;
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*dst = comp(pat, *dst, first);
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} else {
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/* Multiple destination words */
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/* Leading bits */
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if (first) {
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*dst = comp(pat, *dst, first);
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dst++;
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pat = pat << left | pat >> right;
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n -= bits - dst_idx;
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}
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/* Main chunk */
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n /= bits;
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while (n >= 4) {
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*dst++ = pat;
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pat = pat << left | pat >> right;
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*dst++ = pat;
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pat = pat << left | pat >> right;
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*dst++ = pat;
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pat = pat << left | pat >> right;
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*dst++ = pat;
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pat = pat << left | pat >> right;
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n -= 4;
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}
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while (n--) {
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*dst++ = pat;
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pat = pat << left | pat >> right;
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}
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/* Trailing bits */
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if (last)
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*dst = comp(pat, *dst, last);
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}
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}
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/*
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* Aligned pattern invert using 32/64-bit memory accesses
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*/
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static void
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bitfill_aligned_rev(struct fb_info *p, unsigned long *dst, int dst_idx,
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unsigned long pat, unsigned n, int bits)
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{
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unsigned long val = pat;
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unsigned long first, last;
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if (!n)
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return;
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first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
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if (dst_idx+n <= bits) {
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/* Single word */
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if (last)
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first &= last;
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*dst = comp(*dst ^ val, *dst, first);
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} else {
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/* Multiple destination words */
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/* Leading bits */
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if (first!=0UL) {
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*dst = comp(*dst ^ val, *dst, first);
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dst++;
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n -= bits - dst_idx;
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}
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/* Main chunk */
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n /= bits;
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while (n >= 8) {
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*dst++ ^= val;
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*dst++ ^= val;
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*dst++ ^= val;
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*dst++ ^= val;
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*dst++ ^= val;
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*dst++ ^= val;
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*dst++ ^= val;
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*dst++ ^= val;
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n -= 8;
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}
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while (n--)
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*dst++ ^= val;
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/* Trailing bits */
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if (last)
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*dst = comp(*dst ^ val, *dst, last);
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}
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}
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/*
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* Unaligned generic pattern invert using 32/64-bit memory accesses
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* The pattern must have been expanded to a full 32/64-bit value
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* Left/right are the appropriate shifts to convert to the pattern to be
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* used for the next 32/64-bit word
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*/
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static void
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bitfill_unaligned_rev(struct fb_info *p, unsigned long *dst, int dst_idx,
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unsigned long pat, int left, int right, unsigned n,
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int bits)
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{
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unsigned long first, last;
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if (!n)
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return;
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first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
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if (dst_idx+n <= bits) {
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/* Single word */
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if (last)
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first &= last;
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*dst = comp(*dst ^ pat, *dst, first);
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} else {
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/* Multiple destination words */
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/* Leading bits */
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if (first != 0UL) {
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*dst = comp(*dst ^ pat, *dst, first);
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dst++;
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pat = pat << left | pat >> right;
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n -= bits - dst_idx;
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}
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/* Main chunk */
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n /= bits;
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while (n >= 4) {
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*dst++ ^= pat;
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pat = pat << left | pat >> right;
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*dst++ ^= pat;
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pat = pat << left | pat >> right;
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*dst++ ^= pat;
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pat = pat << left | pat >> right;
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*dst++ ^= pat;
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pat = pat << left | pat >> right;
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n -= 4;
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}
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while (n--) {
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*dst ^= pat;
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pat = pat << left | pat >> right;
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}
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/* Trailing bits */
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if (last)
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*dst = comp(*dst ^ pat, *dst, last);
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}
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}
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void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
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{
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unsigned long pat, pat2, fg;
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unsigned long width = rect->width, height = rect->height;
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int bits = BITS_PER_LONG, bytes = bits >> 3;
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u32 bpp = p->var.bits_per_pixel;
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unsigned long *dst;
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int dst_idx, left;
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if (p->state != FBINFO_STATE_RUNNING)
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return;
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if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
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p->fix.visual == FB_VISUAL_DIRECTCOLOR )
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fg = ((u32 *) (p->pseudo_palette))[rect->color];
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else
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fg = rect->color;
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pat = pixel_to_pat( bpp, fg);
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dst = (unsigned long *)((unsigned long)p->screen_base & ~(bytes-1));
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dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
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dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
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/* FIXME For now we support 1-32 bpp only */
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left = bits % bpp;
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if (p->fbops->fb_sync)
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p->fbops->fb_sync(p);
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if (!left) {
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void (*fill_op32)(struct fb_info *p, unsigned long *dst,
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int dst_idx, unsigned long pat, unsigned n,
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int bits) = NULL;
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switch (rect->rop) {
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case ROP_XOR:
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fill_op32 = bitfill_aligned_rev;
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break;
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case ROP_COPY:
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fill_op32 = bitfill_aligned;
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break;
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default:
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printk( KERN_ERR "cfb_fillrect(): unknown rop, "
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"defaulting to ROP_COPY\n");
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fill_op32 = bitfill_aligned;
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break;
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}
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while (height--) {
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= (bits - 1);
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fill_op32(p, dst, dst_idx, pat, width*bpp, bits);
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dst_idx += p->fix.line_length*8;
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}
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} else {
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int right, r;
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void (*fill_op)(struct fb_info *p, unsigned long *dst,
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int dst_idx, unsigned long pat, int left,
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int right, unsigned n, int bits) = NULL;
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#ifdef __LITTLE_ENDIAN
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right = left;
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left = bpp - right;
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#else
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right = bpp - left;
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#endif
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switch (rect->rop) {
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case ROP_XOR:
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fill_op = bitfill_unaligned_rev;
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break;
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case ROP_COPY:
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fill_op = bitfill_unaligned;
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break;
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default:
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printk(KERN_ERR "sys_fillrect(): unknown rop, "
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"defaulting to ROP_COPY\n");
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fill_op = bitfill_unaligned;
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break;
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}
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while (height--) {
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dst += dst_idx / bits;
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dst_idx &= (bits - 1);
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r = dst_idx % bpp;
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/* rotate pattern to the correct start position */
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pat2 = le_long_to_cpu(rolx(cpu_to_le_long(pat), r, bpp));
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fill_op(p, dst, dst_idx, pat2, left, right,
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width*bpp, bits);
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dst_idx += p->fix.line_length*8;
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}
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}
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}
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EXPORT_SYMBOL(sys_fillrect);
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MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
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MODULE_DESCRIPTION("Generic fill rectangle (sys-to-sys)");
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MODULE_LICENSE("GPL");
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