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/*

 *  linux/drivers/video/console/fbcon_ccw.c -- Software Rotation - 270 degrees

 *

 *      Copyright (C) 2005 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"

#include "fbcon_rotate.h"

/*

 * Rotation 270 degrees

 */

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

                                  struct vc_data *vc)

{

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

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

        int mod = vc->vc_font.height % 8;

        u8 c, msk = ~(0xff << offset), msk1 = 0;

        if (mod)

                msk <<= (8 - mod);

        if (offset > mod)

                msk1 |= 0x01;

        for (i = 0; i < vc->vc_font.width; i++) {

                for (j = 0; j < width; j++) {

                        c = *src;

                        if (attribute & FBCON_ATTRIBUTE_UNDERLINE) {

                                if (j == width - 1)

                                        c |= msk;

                                if (msk1 && j == width - 2)

                                        c |= msk1;

                        }

                        if (attribute & FBCON_ATTRIBUTE_BOLD && i)

                                *(dst - width) |= c;

                        if (attribute & FBCON_ATTRIBUTE_REVERSE)

                                c = ~c;

                        src++;

                        *dst++ = c;

                }

        }

}

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

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

{

        struct fbcon_ops *ops = info->fbcon_par;

        struct fb_copyarea area;

        u32 vyres = GETVYRES(ops->p->scrollmode, info);

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

        area.sy = vyres - ((sx + width) * vc->vc_font.width);

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

        area.dy = vyres - ((dx + width) * vc->vc_font.width);

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

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

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

}

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

                     int sx, int height, int width)

{

        struct fbcon_ops *ops = info->fbcon_par;

        struct fb_fillrect region;

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

        u32 vyres = GETVYRES(ops->p->scrollmode, info);

        region.color = attr_bgcol_ec(bgshift,vc);

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

        region.dy = vyres - ((sx + width) * vc->vc_font.width);

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

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

        region.rop = ROP_COPY;

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

}

static inline void ccw_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)

{

        struct fbcon_ops *ops = info->fbcon_par;

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

        u32 idx = (vc->vc_font.height + 7) >> 3;

        u8 *src;

        while (cnt--) {

                src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;

                if (attr) {

                        ccw_update_attr(buf, src, attr, vc);

                        src = buf;

                }

                if (likely(idx == 1))

                        __fb_pad_aligned_buffer(dst, d_pitch, src, idx,

                                                vc->vc_font.width);

                else

                        fb_pad_aligned_buffer(dst, d_pitch, src, idx,

                                              vc->vc_font.width);

                dst += d_pitch * vc->vc_font.width;

        }

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

}

static void ccw_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;

        struct fbcon_ops *ops = info->fbcon_par;

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

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

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

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

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

        u32 cnt, pitch, size;

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

        u8 *dst, *buf = NULL;

        u32 vyres = GETVYRES(ops->p->scrollmode, info);

        if (!ops->fontbuffer)

                return;

        image.fg_color = fg;

        image.bg_color = bg;

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

        image.dy = vyres - ((xx + count) * vc->vc_font.width);

        image.width = vc->vc_font.height;

        image.depth = 1;

        if (attribute) {

                buf = kmalloc(cellsize, GFP_KERNEL);

                if (!buf)

                        return;

        }

        s += count - 1;

        while (count) {

                if (count > maxcnt)

                        cnt = maxcnt;

                else

                        cnt = count;

                image.height = 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;

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

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

                image.dy += image.height;

                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 ccw_clear_margins(struct vc_data *vc, struct fb_info *info,

                             int bottom_only)

{

        unsigned int cw = vc->vc_font.width;

        unsigned int ch = vc->vc_font.height;

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

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

        unsigned int bs = vc->vc_rows*ch;

        struct fb_fillrect region;

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

        region.color = attr_bgcol_ec(bgshift,vc);

        region.rop = ROP_COPY;

        if (rw && !bottom_only) {

                region.dx = 0;

                region.dy = info->var.yoffset;

                region.height = rw;

                region.width = info->var.xres_virtual;

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

        }

        if (bh) {

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

                region.dy = 0;

                region.height = info->var.yres_virtual;

                region.width = bh;

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

        }

}

static void ccw_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.height + 7) >> 3, c;

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

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

        int err = 1, dx, dy;

        char *src;

        u32 vyres = GETVYRES(ops->p->scrollmode, info);

        if (!ops->fontbuffer)

                return;

        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 = ops->fontbuffer + ((c & charmask) * (w * vc->vc_font.width));

        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.width, GFP_ATOMIC);

                if (!dst)

                        return;

                kfree(ops->cursor_data);

                ops->cursor_data = dst;

                ccw_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.height != vc->vc_font.width ||

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

            ops->cursor_reset) {

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

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

                cursor.set |= FB_CUR_SETSIZE;

        }

        dx = y * vc->vc_font.height;

        dy = vyres - ((vc->vc_x + 1) * vc->vc_font.width);

        if (ops->cursor_state.image.dx != dx ||

            ops->cursor_state.image.dy != dy ||

            ops->cursor_reset) {

                ops->cursor_state.image.dx = dx;

                ops->cursor_state.image.dy = dy;

                cursor.set |= FB_CUR_SETPOS;

        }

        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 *tmp, *mask = kmalloc(w*vc->vc_font.width, GFP_ATOMIC);

                int cur_height, size, i = 0;

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

                if (!mask)

                        return;

                tmp = kmalloc(width * vc->vc_font.height, GFP_ATOMIC);

                if (!tmp) {

                        kfree(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) * width;

                while (size--)

                        tmp[i++] = 0;

                size = cur_height * width;

                while (size--)

                        tmp[i++] = 0xff;

                memset(mask, 0, w * vc->vc_font.width);

                rotate_ccw(tmp, mask, vc->vc_font.width, vc->vc_font.height);

                kfree(tmp);

        }

        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 ccw_update_start(struct fb_info *info)

{

        struct fbcon_ops *ops = info->fbcon_par;

        u32 yoffset;

        u32 vyres = GETVYRES(ops->p->scrollmode, info);

        int err;

        yoffset = (vyres - info->var.yres) - ops->var.xoffset;

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

        ops->var.yoffset = yoffset;

        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_rotate_ccw(struct fbcon_ops *ops)

{

        ops->bmove = ccw_bmove;

        ops->clear = ccw_clear;

        ops->putcs = ccw_putcs;

        ops->clear_margins = ccw_clear_margins;

        ops->cursor = ccw_cursor;

        ops->update_start = ccw_update_start;

}

EXPORT_SYMBOL(fbcon_rotate_ccw);

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

MODULE_DESCRIPTION("Console Rotation (270 degrees) Support");

MODULE_LICENSE("GPL");