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/*

 *  linux/drivers/video/console/bitblit.c -- BitBlitting Operation

 *

 *  Originally from the 'accel_*' routines in drivers/video/console/fbcon.c

 *

 *      Copyright (C) 2004 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 <linux/vt_kern.h>

#include <linux/console.h>

#include <asm/types.h>

#include "fbcon.h"

/*

 * Accelerated handlers.

 */

static inline void update_attr(u8 *dst, u8 *src, int attribute,

                               struct vc_data *vc)

{

        int i, offset = (vc->vc_font.height < 10) ? 1 : 2;

        int width = (vc->vc_font.width + 7) >> 3;

        unsigned int cellsize = vc->vc_font.height * width;

        u8 c;

        offset = cellsize - (offset * width);

        for (i = 0; i < cellsize; i++) {

                c = src[i];

                if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i >= offset)

                        c = 0xff;

                if (attribute & FBCON_ATTRIBUTE_BOLD)

                        c |= c >> 1;

                if (attribute & FBCON_ATTRIBUTE_REVERSE)

                        c = ~c;

                dst[i] = c;

        }

}

static void bit_bmove(struct vc_data *vc, struct fb_info *info, int sy,

                      int sx, int dy, int dx, int height, int width)

{

        struct fb_copyarea area;

        area.sx = sx * vc->vc_font.width;

        area.sy = sy * vc->vc_font.height;

        area.dx = dx * vc->vc_font.width;

        area.dy = dy * vc->vc_font.height;

        area.height = height * vc->vc_font.height;

        area.width = width * vc->vc_font.width;

        info->fbops->fb_copyarea(info, &area);

}

static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,

                      int sx, int height, int width)

{

        int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;

        struct fb_fillrect region;

        region.color = attr_bgcol_ec(bgshift, vc);

        region.dx = sx * vc->vc_font.width;

        region.dy = sy * vc->vc_font.height;

        region.width = width * vc->vc_font.width;

        region.height = height * vc->vc_font.height;

        region.rop = ROP_COPY;

        info->fbops->fb_fillrect(info, &region);

}

static inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info,

                                     const u16 *s, u32 attr, u32 cnt,

                                     u32 d_pitch, u32 s_pitch, u32 cellsize,

                                     struct fb_image *image, u8 *buf, u8 *dst)

{

        u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;

        u32 idx = vc->vc_font.width >> 3;

        u8 *src;

        while (cnt--) {

                src = vc->vc_font.data + (scr_readw(s++)&

                                          charmask)*cellsize;

                if (attr) {

                        update_attr(buf, src, attr, vc);

                        src = buf;

                }

                if (likely(idx == 1))

                        __fb_pad_aligned_buffer(dst, d_pitch, src, idx,

                                                image->height);

                else

                        fb_pad_aligned_buffer(dst, d_pitch, src, idx,

                                              image->height);

                dst += s_pitch;

        }

        info->fbops->fb_imageblit(info, image);

}

static inline void bit_putcs_unaligned(struct vc_data *vc,

                                       struct fb_info *info, const u16 *s,

                                       u32 attr, u32 cnt, u32 d_pitch,

                                       u32 s_pitch, u32 cellsize,

                                       struct fb_image *image, u8 *buf,

                                       u8 *dst)

{

        u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;

        u32 shift_low = 0, mod = vc->vc_font.width % 8;

        u32 shift_high = 8;

        u32 idx = vc->vc_font.width >> 3;

        u8 *src;

        while (cnt--) {

                src = vc->vc_font.data + (scr_readw(s++)&

                                          charmask)*cellsize;

                if (attr) {

                        update_attr(buf, src, attr, vc);

                        src = buf;

                }

                fb_pad_unaligned_buffer(dst, d_pitch, src, idx,

                                        image->height, shift_high,

                                        shift_low, mod);

                shift_low += mod;

                dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;

                shift_low &= 7;

                shift_high = 8 - shift_low;

        }

        info->fbops->fb_imageblit(info, image);

}

static void bit_putcs(struct vc_data *vc, struct fb_info *info,

                      const unsigned short *s, int count, int yy, int xx,

                      int fg, int bg)

{

        struct fb_image image;

        u32 width = (vc->vc_font.width + 7)/8;

        u32 cellsize = width * vc->vc_font.height;

        u32 maxcnt = info->pixmap.size/cellsize;

        u32 scan_align = info->pixmap.scan_align - 1;

        u32 buf_align = info->pixmap.buf_align - 1;

        u32 mod = vc->vc_font.width % 8, cnt, pitch, size;

        u32 attribute = get_attribute(info, scr_readw(s));

        u8 *dst, *buf = NULL;

        image.fg_color = fg;

        image.bg_color = bg;

        image.dx = xx * vc->vc_font.width;

        image.dy = yy * vc->vc_font.height;

        image.height = vc->vc_font.height;

        image.depth = 1;

        if (attribute) {

                buf = kmalloc(cellsize, GFP_KERNEL);

                if (!buf)

                        return;

        }

        while (count) {

                if (count > maxcnt)

                        cnt = maxcnt;

                else

                        cnt = count;

                image.width = vc->vc_font.width * cnt;

                pitch = ((image.width + 7) >> 3) + scan_align;

                pitch &= ~scan_align;

                size = pitch * image.height + buf_align;

                size &= ~buf_align;

                dst = fb_get_buffer_offset(info, &info->pixmap, size);

                image.data = dst;

                if (!mod)

                        bit_putcs_aligned(vc, info, s, attribute, cnt, pitch,

                                          width, cellsize, &image, buf, dst);

                else

                        bit_putcs_unaligned(vc, info, s, attribute, cnt,

                                            pitch, width, cellsize, &image,

                                            buf, dst);

                image.dx += cnt * vc->vc_font.width;

                count -= cnt;

                s += cnt;

        }

        /* buf is always NULL except when in monochrome mode, so in this case

           it's a gain to check buf against NULL even though kfree() handles

           NULL pointers just fine */

        if (unlikely(buf))

                kfree(buf);

}

static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,

                              int bottom_only)

{

        int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;

        unsigned int cw = vc->vc_font.width;

        unsigned int ch = vc->vc_font.height;

        unsigned int rw = info->var.xres - (vc->vc_cols*cw);

        unsigned int bh = info->var.yres - (vc->vc_rows*ch);

        unsigned int rs = info->var.xres - rw;

        unsigned int bs = info->var.yres - bh;

        struct fb_fillrect region;

        region.color = attr_bgcol_ec(bgshift, vc);

        region.rop = ROP_COPY;

        if (rw && !bottom_only) {

                region.dx = info->var.xoffset + rs;

                region.dy = 0;

                region.width = rw;

                region.height = info->var.yres_virtual;

                info->fbops->fb_fillrect(info, &region);

        }

        if (bh) {

                region.dx = info->var.xoffset;

                region.dy = info->var.yoffset + bs;

                region.width = rs;

                region.height = bh;

                info->fbops->fb_fillrect(info, &region);

        }

}

static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,

                       int softback_lines, int fg, int bg)

{

        struct fb_cursor cursor;

        struct fbcon_ops *ops = info->fbcon_par;

        unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;

        int w = (vc->vc_font.width + 7) >> 3, c;

        int y = real_y(ops->p, vc->vc_y);

        int attribute, use_sw = (vc->vc_cursor_type & 0x10);

        int err = 1;

        char *src;

        cursor.set = 0;

        if (softback_lines) {

                if (y + softback_lines >= vc->vc_rows) {

                        mode = CM_ERASE;

                        ops->cursor_flash = 0;

                        return;

                } else

                        y += softback_lines;

        }

        c = scr_readw((u16 *) vc->vc_pos);

        attribute = get_attribute(info, c);

        src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));

        if (ops->cursor_state.image.data != src ||

            ops->cursor_reset) {

            ops->cursor_state.image.data = src;

            cursor.set |= FB_CUR_SETIMAGE;

        }

        if (attribute) {

                u8 *dst;

                dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);

                if (!dst)

                        return;

                kfree(ops->cursor_data);

                ops->cursor_data = dst;

                update_attr(dst, src, attribute, vc);

                src = dst;

        }

        if (ops->cursor_state.image.fg_color != fg ||

            ops->cursor_state.image.bg_color != bg ||

            ops->cursor_reset) {

                ops->cursor_state.image.fg_color = fg;

                ops->cursor_state.image.bg_color = bg;

                cursor.set |= FB_CUR_SETCMAP;

        }

        if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||

            (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||

            ops->cursor_reset) {

                ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;

                ops->cursor_state.image.dy = vc->vc_font.height * y;

                cursor.set |= FB_CUR_SETPOS;

        }

        if (ops->cursor_state.image.height != vc->vc_font.height ||

            ops->cursor_state.image.width != vc->vc_font.width ||

            ops->cursor_reset) {

                ops->cursor_state.image.height = vc->vc_font.height;

                ops->cursor_state.image.width = vc->vc_font.width;

                cursor.set |= FB_CUR_SETSIZE;

        }

        if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||

            ops->cursor_reset) {

                ops->cursor_state.hot.x = cursor.hot.y = 0;

                cursor.set |= FB_CUR_SETHOT;

        }

        if (cursor.set & FB_CUR_SETSIZE ||

            vc->vc_cursor_type != ops->p->cursor_shape ||

            ops->cursor_state.mask == NULL ||

            ops->cursor_reset) {

                char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);

                int cur_height, size, i = 0;

                u8 msk = 0xff;

                if (!mask)

                        return;

                kfree(ops->cursor_state.mask);

                ops->cursor_state.mask = mask;

                ops->p->cursor_shape = vc->vc_cursor_type;

                cursor.set |= FB_CUR_SETSHAPE;

                switch (ops->p->cursor_shape & CUR_HWMASK) {

                case CUR_NONE:

                        cur_height = 0;

                        break;

                case CUR_UNDERLINE:

                        cur_height = (vc->vc_font.height < 10) ? 1 : 2;

                        break;

                case CUR_LOWER_THIRD:

                        cur_height = vc->vc_font.height/3;

                        break;

                case CUR_LOWER_HALF:

                        cur_height = vc->vc_font.height >> 1;

                        break;

                case CUR_TWO_THIRDS:

                        cur_height = (vc->vc_font.height << 1)/3;

                        break;

                case CUR_BLOCK:

                default:

                        cur_height = vc->vc_font.height;

                        break;

                }

                size = (vc->vc_font.height - cur_height) * w;

                while (size--)

                        mask[i++] = ~msk;

                size = cur_height * w;

                while (size--)

                        mask[i++] = msk;

        }

        switch (mode) {

        case CM_ERASE:

                ops->cursor_state.enable = 0;

                break;

        case CM_DRAW:

        case CM_MOVE:

        default:

                ops->cursor_state.enable = (use_sw) ? 0 : 1;

                break;

        }

        cursor.image.data = src;

        cursor.image.fg_color = ops->cursor_state.image.fg_color;

        cursor.image.bg_color = ops->cursor_state.image.bg_color;

        cursor.image.dx = ops->cursor_state.image.dx;

        cursor.image.dy = ops->cursor_state.image.dy;

        cursor.image.height = ops->cursor_state.image.height;

        cursor.image.width = ops->cursor_state.image.width;

        cursor.hot.x = ops->cursor_state.hot.x;

        cursor.hot.y = ops->cursor_state.hot.y;

        cursor.mask = ops->cursor_state.mask;

        cursor.enable = ops->cursor_state.enable;

        cursor.image.depth = 1;

        cursor.rop = ROP_XOR;

        if (info->fbops->fb_cursor)

                err = info->fbops->fb_cursor(info, &cursor);

        if (err)

                soft_cursor(info, &cursor);

        ops->cursor_reset = 0;

}

static int bit_update_start(struct fb_info *info)

{

        struct fbcon_ops *ops = info->fbcon_par;

        int err;

        err = fb_pan_display(info, &ops->var);

        ops->var.xoffset = info->var.xoffset;

        ops->var.yoffset = info->var.yoffset;

        ops->var.vmode = info->var.vmode;

        return err;

}

void fbcon_set_bitops(struct fbcon_ops *ops)

{

        ops->bmove = bit_bmove;

        ops->clear = bit_clear;

        ops->putcs = bit_putcs;

        ops->clear_margins = bit_clear_margins;

        ops->cursor = bit_cursor;

        ops->update_start = bit_update_start;

        ops->rotate_font = NULL;

        if (ops->rotate)

                fbcon_set_rotate(ops);

}

EXPORT_SYMBOL(fbcon_set_bitops);

MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");

MODULE_DESCRIPTION("Bit Blitting Operation");

MODULE_LICENSE("GPL");