Commit 96f47d61 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven
Browse files

fbdev: c2p/atafb - Add support for Atari interleaved bitplanes 



The c2p() for normal bitplanes is not suitable for interleaved bitplanes with
2 bytes of interleave, causing a garbled penguin logo. Add c2p_iplan2().

Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
parent 2cd1de0a

drivers/video/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -72,7 +72,7 @@ obj-$(CONFIG_FB_TCX) += tcx.o sbuslib.o 
obj-$(CONFIG_FB_LEO)              += leo.o sbuslib.o

obj-$(CONFIG_FB_SGIVW)            += sgivwfb.o

obj-$(CONFIG_FB_ACORN)            += acornfb.o

obj-$(CONFIG_FB_ATARI)            += atafb.o c2p.o atafb_mfb.o \

obj-$(CONFIG_FB_ATARI)            += atafb.o c2p_iplan2.o atafb_mfb.o \

                                     atafb_iplan2p2.o atafb_iplan2p4.o atafb_iplan2p8.o

obj-$(CONFIG_FB_MAC)              += macfb.o

obj-$(CONFIG_FB_HECUBA)           += hecubafb.o

drivers/video/atafb.c

+3 −12
Original line number Diff line number Diff line
@@ -122,7 +122,6 @@ static struct atafb_par { 
	void *screen_base;

	int yres_virtual;

	u_long next_line;

	u_long next_plane;

#if defined ATAFB_TT || defined ATAFB_STE

	union {

		struct {
@@ -1392,14 +1391,7 @@ set_screen_base: 
	par->screen_base = screen_base + var->yoffset * linelen;

	par->hw.falcon.xoffset = 0;



	// FIXME!!! sort of works, no crash

	//par->next_line = linelen;

	//par->next_plane = yres_virtual * linelen;

	par->next_line = linelen;

	par->next_plane = 2;

	// crashes

	//par->next_plane = linelen;

	//par->next_line  = yres_virtual * linelen;



	return 0;

}
@@ -2662,9 +2654,8 @@ static void atafb_imageblit(struct fb_info *info, const struct fb_image *image) 
			src += pitch;

		}

	} else {

		// only used for logo; broken

		c2p(info->screen_base, image->data, dx, dy, width, height,

		    par->next_line, par->next_plane, image->width,

		c2p_iplan2(info->screen_base, image->data, dx, dy, width,

			   height, par->next_line, image->width,

			   info->var.bits_per_pixel);

	}

}

drivers/video/c2p.h

+4 −1
Original line number Diff line number Diff line 
/*

 *  Fast C2P (Chunky-to-Planar) Conversion

 *

 *  Copyright (C) 2003 Geert Uytterhoeven

 *  Copyright (C) 2003-2008 Geert Uytterhoeven

 *

 *  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
@@ -14,3 +14,6 @@ extern void c2p(void *dst, const void *src, u32 dx, u32 dy, u32 width, 
		u32 height, u32 dst_nextline, u32 dst_nextplane,

		u32 src_nextline, u32 bpp);



extern void c2p_iplan2(void *dst, const void *src, u32 dx, u32 dy, u32 width,

		       u32 height, u32 dst_nextline, u32 src_nextline,

		       u32 bpp);

drivers/video/c2p_core.h

+47 −0
Original line number Diff line number Diff line
@@ -95,6 +95,53 @@ static inline void transp8(u32 d[], unsigned int n, unsigned int m) 
}





    /*

     *  Transpose operations on 4 32-bit words

     */



static inline void transp4(u32 d[], unsigned int n, unsigned int m)

{

	u32 mask = get_mask(n);



	switch (m) {

	case 1:

		/* First n x 1 block */

		_transp(d, 0, 1, n, mask);

		/* Second n x 1 block */

		_transp(d, 2, 3, n, mask);

		return;



	case 2:

		/* Single n x 2 block */

		_transp(d, 0, 2, n, mask);

		_transp(d, 1, 3, n, mask);

		return;

	}



	c2p_unsupported();

}





    /*

     *  Transpose operations on 4 32-bit words (reverse order)

     */



static inline void transp4x(u32 d[], unsigned int n, unsigned int m)

{

	u32 mask = get_mask(n);



	switch (m) {

	case 2:

		/* Single n x 2 block */

		_transp(d, 2, 0, n, mask);

		_transp(d, 3, 1, n, mask);

		return;

	}



	c2p_unsupported();

}





    /*

     *  Compose two values, using a bitmask as decision value

     *  This is equivalent to (a & mask) | (b & ~mask)

drivers/video/c2p_iplan2.c

0 → 100644
+153 −0
Original line number Diff line number Diff line 
/*

 *  Fast C2P (Chunky-to-Planar) Conversion

 *

 *  Copyright (C) 2003-2008 Geert Uytterhoeven

 *

 *  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 <asm/unaligned.h>



#include "c2p.h"

#include "c2p_core.h"





    /*

     *  Perform a full C2P step on 16 8-bit pixels, stored in 4 32-bit words

     *  containing

     *    - 16 8-bit chunky pixels on input

     *    - permutated planar data (2 planes per 32-bit word) on output

     */



static void c2p_16x8(u32 d[4])

{

	transp4(d, 8, 2);

	transp4(d, 1, 2);

	transp4x(d, 16, 2);

	transp4x(d, 2, 2);

	transp4(d, 4, 1);

}





    /*

     *  Array containing the permutation indices of the planar data after c2p

     */



static const int perm_c2p_16x8[4] = { 1, 3, 0, 2 };





    /*

     *  Store a full block of iplan2 data after c2p conversion

     */



static inline void store_iplan2(void *dst, u32 bpp, u32 d[4])

{

	int i;



	for (i = 0; i < bpp/2; i++, dst += 4)

		put_unaligned_be32(d[perm_c2p_16x8[i]], dst);

}





    /*

     *  Store a partial block of iplan2 data after c2p conversion

     */



static inline void store_iplan2_masked(void *dst, u32 bpp, u32 d[4], u32 mask)

{

	int i;



	for (i = 0; i < bpp/2; i++, dst += 4)

		put_unaligned_be32(comp(d[perm_c2p_16x8[i]],

					get_unaligned_be32(dst), mask),

				   dst);

}





    /*

     *  c2p_iplan2 - Copy 8-bit chunky image data to an interleaved planar

     *  frame buffer with 2 bytes of interleave

     *  @dst: Starting address of the planar frame buffer

     *  @dx: Horizontal destination offset (in pixels)

     *  @dy: Vertical destination offset (in pixels)

     *  @width: Image width (in pixels)

     *  @height: Image height (in pixels)

     *  @dst_nextline: Frame buffer offset to the next line (in bytes)

     *  @src_nextline: Image offset to the next line (in bytes)

     *  @bpp: Bits per pixel of the planar frame buffer (2, 4, or 8)

     */



void c2p_iplan2(void *dst, const void *src, u32 dx, u32 dy, u32 width,

		u32 height, u32 dst_nextline, u32 src_nextline, u32 bpp)

{

	union {

		u8 pixels[16];

		u32 words[4];

	} d;

	u32 dst_idx, first, last, w;

	const u8 *c;

	void *p;



	dst += dy*dst_nextline+(dx & ~15)*bpp;

	dst_idx = dx % 16;

	first = 0xffffU >> dst_idx;

	first |= first << 16;

	last = 0xffffU ^ (0xffffU >> ((dst_idx+width) % 16));

	last |= last << 16;

	while (height--) {

		c = src;

		p = dst;

		w = width;

		if (dst_idx+width <= 16) {

			/* Single destination word */

			first &= last;

			memset(d.pixels, 0, sizeof(d));

			memcpy(d.pixels+dst_idx, c, width);

			c += width;

			c2p_16x8(d.words);

			store_iplan2_masked(p, bpp, d.words, first);

			p += bpp*2;

		} else {

			/* Multiple destination words */

			w = width;

			/* Leading bits */

			if (dst_idx) {

				w = 16 - dst_idx;

				memset(d.pixels, 0, dst_idx);

				memcpy(d.pixels+dst_idx, c, w);

				c += w;

				c2p_16x8(d.words);

				store_iplan2_masked(p, bpp, d.words, first);

				p += bpp*2;

				w = width-w;

			}

			/* Main chunk */

			while (w >= 16) {

				memcpy(d.pixels, c, 16);

				c += 16;

				c2p_16x8(d.words);

				store_iplan2(p, bpp, d.words);

				p += bpp*2;

				w -= 16;

			}

			/* Trailing bits */

			w %= 16;

			if (w > 0) {

				memcpy(d.pixels, c, w);

				memset(d.pixels+w, 0, 16-w);

				c2p_16x8(d.words);

				store_iplan2_masked(p, bpp, d.words, last);

			}

		}

		src += src_nextline;

		dst += dst_nextline;

	}

}

EXPORT_SYMBOL_GPL(c2p_iplan2);



MODULE_LICENSE("GPL");

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