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author | Antonino A. Daplas <adaplas@gmail.com> | 2007-05-08 09:38:57 +0200 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 20:15:30 +0200 |
commit | 68648ed1f58d98b8e8d994022e5e25331fbfe42a (patch) | |
tree | 77c721d08b11aba58a30779e7b3294a96dd7fb29 /drivers/video/sysfillrect.c | |
parent | skeletonfb: documentation error fixes (diff) | |
download | linux-68648ed1f58d98b8e8d994022e5e25331fbfe42a.tar.xz linux-68648ed1f58d98b8e8d994022e5e25331fbfe42a.zip |
fbdev: add drawing functions for framebuffers in system RAM
The generic drawing functions (cfbimgblt, cfbcopyarea, cfbfillrect) assume
that the framebuffer is in IO memory. However, we have 3 drivers (hecubafb,
arcfb, and vfb) where the framebuffer is allocated from system RAM (via
vmalloc). Using _raw_read/write and family for these drivers (as used in
the cfb* functions) is illegal, especially in other platforms.
Create 3 new drawing functions, based almost entirely from the original
except that the framebuffer memory is assumed to be in system RAM.
These are named as sysimgblt, syscopyarea, and sysfillrect.
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>
Diffstat (limited to 'drivers/video/sysfillrect.c')
-rw-r--r-- | drivers/video/sysfillrect.c | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/drivers/video/sysfillrect.c b/drivers/video/sysfillrect.c new file mode 100644 index 000000000000..10de70779a50 --- /dev/null +++ b/drivers/video/sysfillrect.c @@ -0,0 +1,400 @@ +/* + * Generic fillrect for frame buffers in system RAM with packed pixels of + * any depth. + * + * Based almost entirely from cfbfillrect.c (which is based almost entirely + * on Geert Uytterhoeven's fillrect 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/string.h> +#include <linux/fb.h> +#include <asm/types.h> + + /* + * Compose two values, using a bitmask as decision value + * This is equivalent to (a & mask) | (b & ~mask) + */ + +static inline unsigned long +comp(unsigned long a, unsigned long b, unsigned long mask) +{ + return ((a ^ b) & mask) ^ b; +} + + /* + * Create a pattern with the given pixel's color + */ + +#if BITS_PER_LONG == 64 +static inline unsigned long +pixel_to_pat( u32 bpp, u32 pixel) +{ + switch (bpp) { + case 1: + return 0xfffffffffffffffful*pixel; + case 2: + return 0x5555555555555555ul*pixel; + case 4: + return 0x1111111111111111ul*pixel; + case 8: + return 0x0101010101010101ul*pixel; + case 12: + return 0x0001001001001001ul*pixel; + case 16: + return 0x0001000100010001ul*pixel; + case 24: + return 0x0000000001000001ul*pixel; + case 32: + return 0x0000000100000001ul*pixel; + default: + panic("pixel_to_pat(): unsupported pixelformat\n"); + } +} +#else +static inline unsigned long +pixel_to_pat( u32 bpp, u32 pixel) +{ + switch (bpp) { + case 1: + return 0xfffffffful*pixel; + case 2: + return 0x55555555ul*pixel; + case 4: + return 0x11111111ul*pixel; + case 8: + return 0x01010101ul*pixel; + case 12: + return 0x00001001ul*pixel; + case 16: + return 0x00010001ul*pixel; + case 24: + return 0x00000001ul*pixel; + case 32: + return 0x00000001ul*pixel; + default: + panic("pixel_to_pat(): unsupported pixelformat\n"); + } +} +#endif + + /* + * Aligned pattern fill using 32/64-bit memory accesses + */ + +static void +bitfill_aligned(unsigned long *dst, int dst_idx, unsigned long pat, + unsigned n, int bits) +{ + unsigned long first, last; + + if (!n) + return; + + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); + + if (dst_idx+n <= bits) { + /* Single word */ + if (last) + first &= last; + *dst = comp(pat, *dst, first); + } else { + /* Multiple destination words */ + + /* Leading bits */ + if (first!= ~0UL) { + *dst = comp(pat, *dst, first); + dst++; + n -= bits - dst_idx; + } + + /* Main chunk */ + n /= bits; + while (n >= 8) { + *dst++ = pat; + *dst++ = pat; + *dst++ = pat; + *dst++ = pat; + *dst++ = pat; + *dst++ = pat; + *dst++ = pat; + *dst++ = pat; + n -= 8; + } + while (n--) + *dst++ = pat; + /* Trailing bits */ + if (last) + *dst = comp(pat, *dst, last); + } +} + + + /* + * Unaligned generic pattern fill using 32/64-bit memory accesses + * The pattern must have been expanded to a full 32/64-bit value + * Left/right are the appropriate shifts to convert to the pattern to be + * used for the next 32/64-bit word + */ + +static void +bitfill_unaligned(unsigned long *dst, int dst_idx, unsigned long pat, + int left, int right, unsigned n, int bits) +{ + unsigned long first, last; + + if (!n) + return; + + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); + + if (dst_idx+n <= bits) { + /* Single word */ + if (last) + first &= last; + *dst = comp(pat, *dst, first); + } else { + /* Multiple destination words */ + /* Leading bits */ + if (first) { + *dst = comp(pat, *dst, first); + dst++; + pat = pat << left | pat >> right; + n -= bits - dst_idx; + } + + /* Main chunk */ + n /= bits; + while (n >= 4) { + *dst++ = pat; + pat = pat << left | pat >> right; + *dst++ = pat; + pat = pat << left | pat >> right; + *dst++ = pat; + pat = pat << left | pat >> right; + *dst++ = pat; + pat = pat << left | pat >> right; + n -= 4; + } + while (n--) { + *dst++ = pat; + pat = pat << left | pat >> right; + } + + /* Trailing bits */ + if (last) + *dst = comp(pat, *dst, first); + } +} + + /* + * Aligned pattern invert using 32/64-bit memory accesses + */ +static void +bitfill_aligned_rev(unsigned long *dst, int dst_idx, unsigned long pat, + unsigned n, int bits) +{ + unsigned long val = pat; + unsigned long first, last; + + if (!n) + return; + + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); + + if (dst_idx+n <= bits) { + /* Single word */ + if (last) + first &= last; + *dst = comp(*dst ^ val, *dst, first); + } else { + /* Multiple destination words */ + /* Leading bits */ + if (first!=0UL) { + *dst = comp(*dst ^ val, *dst, first); + dst++; + n -= bits - dst_idx; + } + + /* Main chunk */ + n /= bits; + while (n >= 8) { + *dst++ ^= val; + *dst++ ^= val; + *dst++ ^= val; + *dst++ ^= val; + *dst++ ^= val; + *dst++ ^= val; + *dst++ ^= val; + *dst++ ^= val; + n -= 8; + } + while (n--) + *dst++ ^= val; + /* Trailing bits */ + if (last) + *dst = comp(*dst ^ val, *dst, last); + } +} + + + /* + * Unaligned generic pattern invert using 32/64-bit memory accesses + * The pattern must have been expanded to a full 32/64-bit value + * Left/right are the appropriate shifts to convert to the pattern to be + * used for the next 32/64-bit word + */ + +static void +bitfill_unaligned_rev(unsigned long *dst, int dst_idx, unsigned long pat, + int left, int right, unsigned n, int bits) +{ + unsigned long first, last; + + if (!n) + return; + + first = FB_SHIFT_HIGH(~0UL, dst_idx); + last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits)); + + if (dst_idx+n <= bits) { + /* Single word */ + if (last) + first &= last; + *dst = comp(*dst ^ pat, *dst, first); + } else { + /* Multiple destination words */ + + /* Leading bits */ + if (first != 0UL) { + *dst = comp(*dst ^ pat, *dst, first); + dst++; + pat = pat << left | pat >> right; + n -= bits - dst_idx; + } + + /* Main chunk */ + n /= bits; + while (n >= 4) { + *dst++ ^= pat; + pat = pat << left | pat >> right; + *dst++ ^= pat; + pat = pat << left | pat >> right; + *dst++ ^= pat; + pat = pat << left | pat >> right; + *dst++ ^= pat; + pat = pat << left | pat >> right; + n -= 4; + } + while (n--) { + *dst ^= pat; + pat = pat << left | pat >> right; + } + + /* Trailing bits */ + if (last) + *dst = comp(*dst ^ pat, *dst, last); + } +} + +void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect) +{ + unsigned long pat, fg; + unsigned long width = rect->width, height = rect->height; + int bits = BITS_PER_LONG, bytes = bits >> 3; + u32 bpp = p->var.bits_per_pixel; + unsigned long *dst; + int dst_idx, left; + + if (p->state != FBINFO_STATE_RUNNING) + return; + + if (p->fix.visual == FB_VISUAL_TRUECOLOR || + p->fix.visual == FB_VISUAL_DIRECTCOLOR ) + fg = ((u32 *) (p->pseudo_palette))[rect->color]; + else + fg = rect->color; + + pat = pixel_to_pat( bpp, fg); + + dst = (unsigned long *)((unsigned long)p->screen_base & ~(bytes-1)); + dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8; + dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp; + /* FIXME For now we support 1-32 bpp only */ + left = bits % bpp; + if (p->fbops->fb_sync) + p->fbops->fb_sync(p); + if (!left) { + void (*fill_op32)(unsigned long *dst, int dst_idx, + unsigned long pat, unsigned n, int bits) = + NULL; + + switch (rect->rop) { + case ROP_XOR: + fill_op32 = bitfill_aligned_rev; + break; + case ROP_COPY: + fill_op32 = bitfill_aligned; + break; + default: + printk( KERN_ERR "cfb_fillrect(): unknown rop, " + "defaulting to ROP_COPY\n"); + fill_op32 = bitfill_aligned; + break; + } + while (height--) { + dst += dst_idx >> (ffs(bits) - 1); + dst_idx &= (bits - 1); + fill_op32(dst, dst_idx, pat, width*bpp, bits); + dst_idx += p->fix.line_length*8; + } + } else { + int right; + int r; + int rot = (left-dst_idx) % bpp; + void (*fill_op)(unsigned long *dst, int dst_idx, + unsigned long pat, int left, int right, + unsigned n, int bits) = NULL; + + /* rotate pattern to correct start position */ + pat = pat << rot | pat >> (bpp-rot); + + right = bpp-left; + switch (rect->rop) { + case ROP_XOR: + fill_op = bitfill_unaligned_rev; + break; + case ROP_COPY: + fill_op = bitfill_unaligned; + break; + default: + printk(KERN_ERR "cfb_fillrect(): unknown rop, " + "defaulting to ROP_COPY\n"); + fill_op = bitfill_unaligned; + break; + } + while (height--) { + dst += dst_idx >> (ffs(bits) - 1); + dst_idx &= (bits - 1); + fill_op(dst, dst_idx, pat, left, right, + width*bpp, bits); + r = (p->fix.line_length*8) % bpp; + pat = pat << (bpp-r) | pat >> r; + dst_idx += p->fix.line_length*8; + } + } +} + +EXPORT_SYMBOL(sys_fillrect); + +MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>"); +MODULE_DESCRIPTION("Generic fill rectangle (sys-to-sys)"); +MODULE_LICENSE("GPL"); |