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be0d9b6c7a
The drawing function cfbfillrect does not work correctly when access is not unsigned-long aligned. It manifests as extra lines of pixels that are not complete drawn. Reversing the shift operator solves the problem, so I would presume that this bug would manifest only on little endian machines. The function cfbcopyarea may also have this bug. Aligned access should present no problems. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
435 lines
9.9 KiB
C
435 lines
9.9 KiB
C
/*
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* Generic fillrect for frame buffers with packed pixels of any depth.
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*
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* Copyright (C) 2000 James Simmons (jsimmons@linux-fbdev.org)
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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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* NOTES:
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*
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* The code for depths like 24 that don't have integer number of pixels per
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* long is broken and needs to be fixed. For now I turned these types of
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* mode off.
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*
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* Also need to add code to deal with cards endians that are different than
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* the native cpu endians. I also need to deal with MSB position in the word.
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*
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*/
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#include <linux/config.h>
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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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#if BITS_PER_LONG == 32
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# define FB_WRITEL fb_writel
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# define FB_READL fb_readl
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#else
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# define FB_WRITEL fb_writeq
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# define FB_READL fb_readq
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#endif
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/*
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* Compose two values, using a bitmask as decision value
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* This is equivalent to (a & mask) | (b & ~mask)
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*/
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static inline unsigned long
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comp(unsigned long a, unsigned long b, unsigned long mask)
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{
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return ((a ^ b) & mask) ^ b;
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}
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/*
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* Create a pattern with the given pixel's color
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*/
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#if BITS_PER_LONG == 64
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static inline unsigned long
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pixel_to_pat( u32 bpp, u32 pixel)
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{
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switch (bpp) {
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case 1:
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return 0xfffffffffffffffful*pixel;
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case 2:
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return 0x5555555555555555ul*pixel;
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case 4:
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return 0x1111111111111111ul*pixel;
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case 8:
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return 0x0101010101010101ul*pixel;
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case 12:
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return 0x0001001001001001ul*pixel;
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case 16:
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return 0x0001000100010001ul*pixel;
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case 24:
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return 0x0000000001000001ul*pixel;
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case 32:
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return 0x0000000100000001ul*pixel;
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default:
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panic("pixel_to_pat(): unsupported pixelformat\n");
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}
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}
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#else
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static inline unsigned long
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pixel_to_pat( u32 bpp, u32 pixel)
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{
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switch (bpp) {
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case 1:
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return 0xfffffffful*pixel;
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case 2:
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return 0x55555555ul*pixel;
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case 4:
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return 0x11111111ul*pixel;
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case 8:
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return 0x01010101ul*pixel;
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case 12:
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return 0x00001001ul*pixel;
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case 16:
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return 0x00010001ul*pixel;
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case 24:
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return 0x00000001ul*pixel;
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case 32:
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return 0x00000001ul*pixel;
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default:
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panic("pixel_to_pat(): unsupported pixelformat\n");
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}
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}
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#endif
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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(unsigned long __iomem *dst, int dst_idx, 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(~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(~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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FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
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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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FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
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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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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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FB_WRITEL(pat, dst++);
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n -= 8;
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}
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while (n--)
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FB_WRITEL(pat, dst++);
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// Trailing bits
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if (last)
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FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
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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(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
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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(~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(~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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FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
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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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FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
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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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FB_WRITEL(pat, dst++);
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pat = pat << left | pat >> right;
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FB_WRITEL(pat, dst++);
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pat = pat << left | pat >> right;
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FB_WRITEL(pat, dst++);
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pat = pat << left | pat >> right;
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FB_WRITEL(pat, dst++);
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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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FB_WRITEL(pat, dst++);
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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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FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
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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(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsigned n, int bits)
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{
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unsigned long val = pat, dat;
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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(~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(~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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dat = FB_READL(dst);
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FB_WRITEL(comp(dat ^ val, dat, first), dst);
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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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dat = FB_READL(dst);
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FB_WRITEL(comp(dat ^ val, dat, first), dst);
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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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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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n -= 8;
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}
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while (n--) {
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FB_WRITEL(FB_READL(dst) ^ val, dst);
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dst++;
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}
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// Trailing bits
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if (last) {
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dat = FB_READL(dst);
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FB_WRITEL(comp(dat ^ val, dat, last), dst);
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}
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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(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
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int left, int right, unsigned n, int bits)
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{
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unsigned long first, last, dat;
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if (!n)
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return;
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first = FB_SHIFT_HIGH(~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(~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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dat = FB_READL(dst);
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FB_WRITEL(comp(dat ^ pat, dat, first), dst);
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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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dat = FB_READL(dst);
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FB_WRITEL(comp(dat ^ pat, dat, first), dst);
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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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FB_WRITEL(FB_READL(dst) ^ pat, dst);
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dst++;
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pat = pat << left | pat >> right;
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FB_WRITEL(FB_READL(dst) ^ pat, dst);
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dst++;
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pat = pat << left | pat >> right;
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FB_WRITEL(FB_READL(dst) ^ pat, dst);
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dst++;
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pat = pat << left | pat >> right;
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FB_WRITEL(FB_READL(dst) ^ pat, dst);
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dst++;
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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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FB_WRITEL(FB_READL(dst) ^ pat, dst);
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dst++;
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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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dat = FB_READL(dst);
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FB_WRITEL(comp(dat ^ pat, dat, last), dst);
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}
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}
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}
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void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
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{
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unsigned long pat, 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 __iomem *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 __iomem *)((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)(unsigned long __iomem *dst, int dst_idx,
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unsigned long pat, unsigned n, 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, 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(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;
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int r;
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int rot = (left-dst_idx) % bpp;
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void (*fill_op)(unsigned long __iomem *dst, int dst_idx,
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unsigned long pat, int left, int right,
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unsigned n, int bits) = NULL;
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/* rotate pattern to correct start position */
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pat = pat << rot | pat >> (bpp-rot);
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right = bpp-left;
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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 "cfb_fillrect(): unknown rop, 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 >> (ffs(bits) - 1);
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dst_idx &= (bits - 1);
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fill_op(dst, dst_idx, pat, left, right,
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width*bpp, bits);
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r = (p->fix.line_length*8) % bpp;
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pat = pat << (bpp-r) | pat >> r;
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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(cfb_fillrect);
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MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
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MODULE_DESCRIPTION("Generic software accelerated fill rectangle");
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MODULE_LICENSE("GPL");
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