779121e9f1
Allow generic frame-buffer code to correctly write texts and blit images for 1, 2 and 4 bit per pixel frame-buffer organizations when pixels in bytes are organized to in opposite order than bytes in long type. Overhead should be reasonable. If option is not selected, than compiler should eliminate completely all overhead. The feature is disabled at compile time if CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set. [adaplas] Convert helper functions to macros if feature is not enabled. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> 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>
394 lines
10 KiB
C
394 lines
10 KiB
C
/*
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* Generic function for frame buffer with packed pixels of any depth.
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*
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* Copyright (C) 1999-2005 James Simmons <jsimmons@www.infradead.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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* This is for cfb packed pixels. Iplan and such are incorporated in the
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* drivers that need them.
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*
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* FIXME
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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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* The two functions or copying forward and backward could be split up like
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* the ones for filling, i.e. in aligned and unaligned versions. This would
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* help moving some redundant computations and branches out of the loop, too.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/fb.h>
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#include <linux/slab.h>
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#include <asm/types.h>
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#include <asm/io.h>
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#include "fb_draw.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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* Generic bitwise copy algorithm
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*/
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static void
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bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
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int src_idx, int bits, unsigned n, u32 bswapmask)
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{
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unsigned long first, last;
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int const shift = dst_idx-src_idx;
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int left, right;
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first = fb_shifted_pixels_mask_long(dst_idx, bswapmask);
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last = ~fb_shifted_pixels_mask_long((dst_idx+n) % bits, bswapmask);
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if (!shift) {
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// Same alignment for source and dest
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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( FB_READL(src), 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( FB_READL(src), FB_READL(dst), first), dst);
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dst++;
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src++;
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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(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), 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(src++), dst++);
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// Trailing bits
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if (last)
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
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}
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} else {
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unsigned long d0, d1;
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int m;
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// Different alignment for source and dest
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right = shift & (bits - 1);
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left = -shift & (bits - 1);
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if (dst_idx+n <= bits) {
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// Single destination word
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if (last)
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first &= last;
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if (shift > 0) {
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// Single source word
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FB_WRITEL( comp( FB_READL(src) >> right, FB_READL(dst), first), dst);
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} else if (src_idx+n <= bits) {
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// Single source word
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FB_WRITEL( comp(FB_READL(src) << left, FB_READL(dst), first), dst);
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} else {
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// 2 source words
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d0 = FB_READL(src++);
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d1 = FB_READL(src);
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FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
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}
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} else {
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// Multiple destination words
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/** We must always remember the last value read, because in case
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SRC and DST overlap bitwise (e.g. when moving just one pixel in
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1bpp), we always collect one full long for DST and that might
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overlap with the current long from SRC. We store this value in
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'd0'. */
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d0 = FB_READL(src++);
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// Leading bits
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if (shift > 0) {
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// Single source word
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FB_WRITEL( comp(d0 >> right, FB_READL(dst), first), dst);
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dst++;
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n -= bits - dst_idx;
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} else {
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// 2 source words
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d1 = FB_READL(src++);
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FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
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d0 = d1;
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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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m = n % bits;
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n /= bits;
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while (n >= 4) {
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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n -= 4;
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}
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while (n--) {
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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}
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// Trailing bits
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if (last) {
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if (m <= right) {
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// Single source word
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FB_WRITEL( comp(d0 << left, FB_READL(dst), last), dst);
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} else {
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// 2 source words
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d1 = FB_READL(src);
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FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), last), dst);
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}
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}
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}
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}
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}
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/*
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* Generic bitwise copy algorithm, operating backward
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*/
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static void
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bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
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int src_idx, int bits, unsigned n, u32 bswapmask)
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{
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unsigned long first, last;
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int shift;
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dst += (n-1)/bits;
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src += (n-1)/bits;
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if ((n-1) % bits) {
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dst_idx += (n-1) % bits;
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= bits - 1;
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src_idx += (n-1) % bits;
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src += src_idx >> (ffs(bits) - 1);
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src_idx &= bits - 1;
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}
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shift = dst_idx-src_idx;
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first = fb_shifted_pixels_mask_long(bits - 1 - dst_idx, bswapmask);
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last = ~fb_shifted_pixels_mask_long(bits - 1 - ((dst_idx-n) % bits), bswapmask);
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if (!shift) {
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// Same alignment for source and dest
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if ((unsigned long)dst_idx+1 >= n) {
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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( FB_READL(src), 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( FB_READL(src), FB_READL(dst), first), dst);
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dst--;
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src--;
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n -= dst_idx+1;
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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(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), 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(src--), dst--);
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// Trailing bits
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if (last)
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
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}
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} else {
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// Different alignment for source and dest
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int const left = -shift & (bits-1);
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int const right = shift & (bits-1);
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if ((unsigned long)dst_idx+1 >= n) {
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// Single destination word
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if (last)
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first &= last;
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if (shift < 0) {
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// Single source word
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FB_WRITEL( comp( FB_READL(src)<<left, FB_READL(dst), first), dst);
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} else if (1+(unsigned long)src_idx >= n) {
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// Single source word
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FB_WRITEL( comp( FB_READL(src)>>right, FB_READL(dst), first), dst);
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} else {
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// 2 source words
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FB_WRITEL( comp( (FB_READL(src)>>right | FB_READL(src-1)<<left), FB_READL(dst), first), dst);
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}
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} else {
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// Multiple destination words
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/** We must always remember the last value read, because in case
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SRC and DST overlap bitwise (e.g. when moving just one pixel in
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1bpp), we always collect one full long for DST and that might
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overlap with the current long from SRC. We store this value in
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'd0'. */
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unsigned long d0, d1;
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int m;
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d0 = FB_READL(src--);
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// Leading bits
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if (shift < 0) {
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// Single source word
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FB_WRITEL( comp( (d0 << left), FB_READL(dst), first), dst);
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} else {
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// 2 source words
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d1 = FB_READL(src--);
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FB_WRITEL( comp( (d0>>right | d1<<left), FB_READL(dst), first), dst);
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d0 = d1;
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}
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dst--;
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n -= dst_idx+1;
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// Main chunk
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m = n % bits;
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n /= bits;
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while (n >= 4) {
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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n -= 4;
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}
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while (n--) {
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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}
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// Trailing bits
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if (last) {
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if (m <= left) {
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// Single source word
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FB_WRITEL( comp(d0 >> right, FB_READL(dst), last), dst);
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} else {
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// 2 source words
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d1 = FB_READL(src);
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FB_WRITEL( comp(d0>>right | d1<<left, FB_READL(dst), last), dst);
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}
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}
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}
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}
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}
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void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
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{
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u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
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u32 height = area->height, width = area->width;
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unsigned long const bits_per_line = p->fix.line_length*8u;
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unsigned long __iomem *dst = NULL, *src = NULL;
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int bits = BITS_PER_LONG, bytes = bits >> 3;
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int dst_idx = 0, src_idx = 0, rev_copy = 0;
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u32 bswapmask = fb_compute_bswapmask(p);
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if (p->state != FBINFO_STATE_RUNNING)
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return;
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/* if the beginning of the target area might overlap with the end of
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the source area, be have to copy the area reverse. */
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if ((dy == sy && dx > sx) || (dy > sy)) {
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dy += height;
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sy += height;
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rev_copy = 1;
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}
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// split the base of the framebuffer into a long-aligned address and the
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// index of the first bit
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dst = src = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
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dst_idx = src_idx = 8*((unsigned long)p->screen_base & (bytes-1));
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// add offset of source and target area
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dst_idx += dy*bits_per_line + dx*p->var.bits_per_pixel;
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src_idx += sy*bits_per_line + sx*p->var.bits_per_pixel;
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if (p->fbops->fb_sync)
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p->fbops->fb_sync(p);
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if (rev_copy) {
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while (height--) {
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dst_idx -= bits_per_line;
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src_idx -= bits_per_line;
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= (bytes - 1);
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src += src_idx >> (ffs(bits) - 1);
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src_idx &= (bytes - 1);
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bitcpy_rev(dst, dst_idx, src, src_idx, bits,
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width*p->var.bits_per_pixel, bswapmask);
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}
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} else {
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while (height--) {
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= (bytes - 1);
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src += src_idx >> (ffs(bits) - 1);
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src_idx &= (bytes - 1);
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bitcpy(dst, dst_idx, src, src_idx, bits,
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width*p->var.bits_per_pixel, bswapmask);
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dst_idx += bits_per_line;
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src_idx += bits_per_line;
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}
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}
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}
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EXPORT_SYMBOL(cfb_copyarea);
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MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
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MODULE_DESCRIPTION("Generic software accelerated copyarea");
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MODULE_LICENSE("GPL");
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