/*
 *  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/slab.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 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_par *par = info->fbcon_par;
        struct fb_copyarea area;
        u32 vyres = GETVYRES(par->p, 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, int fg, int bg)
{
        struct fbcon_par *par = info->fbcon_par;
        struct fb_fillrect region;
        u32 vyres = GETVYRES(par->p, info);

        region.color = bg;
        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_par *par = 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 = par->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_par *par = 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(par->p, info);

        if (!par->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 color, 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;

        region.color = color;
        region.rop = ROP_COPY;

        if ((int) rw > 0 && !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 ((int) bh > 0) {
                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, bool enable,
                       int fg, int bg)
{
        struct fb_cursor cursor;
        struct fbcon_par *par = 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(par->p, vc->state.y);
        int attribute, use_sw = vc->vc_cursor_type & CUR_SW;
        int err = 1, dx, dy;
        char *src;
        u32 vyres = GETVYRES(par->p, info);

        if (!par->fontbuffer)
                return;

        cursor.set = 0;

        c = scr_readw((u16 *) vc->vc_pos);
        attribute = get_attribute(info, c);
        src = par->fontbuffer + ((c & charmask) * (w * vc->vc_font.width));

        if (par->cursor_state.image.data != src ||
            par->cursor_reset) {
                par->cursor_state.image.data = src;
                cursor.set |= FB_CUR_SETIMAGE;
        }

        if (attribute) {
                u8 *dst;

                dst = kmalloc_array(w, vc->vc_font.width, GFP_ATOMIC);
                if (!dst)
                        return;
                kfree(par->cursor_data);
                par->cursor_data = dst;
                ccw_update_attr(dst, src, attribute, vc);
                src = dst;
        }

        if (par->cursor_state.image.fg_color != fg ||
            par->cursor_state.image.bg_color != bg ||
            par->cursor_reset) {
                par->cursor_state.image.fg_color = fg;
                par->cursor_state.image.bg_color = bg;
                cursor.set |= FB_CUR_SETCMAP;
        }

        if (par->cursor_state.image.height != vc->vc_font.width ||
            par->cursor_state.image.width != vc->vc_font.height ||
            par->cursor_reset) {
                par->cursor_state.image.height = vc->vc_font.width;
                par->cursor_state.image.width = vc->vc_font.height;
                cursor.set |= FB_CUR_SETSIZE;
        }

        dx = y * vc->vc_font.height;
        dy = vyres - ((vc->state.x + 1) * vc->vc_font.width);

        if (par->cursor_state.image.dx != dx ||
            par->cursor_state.image.dy != dy ||
            par->cursor_reset) {
                par->cursor_state.image.dx = dx;
                par->cursor_state.image.dy = dy;
                cursor.set |= FB_CUR_SETPOS;
        }

        if (par->cursor_state.hot.x || par->cursor_state.hot.y ||
            par->cursor_reset) {
                par->cursor_state.hot.x = cursor.hot.y = 0;
                cursor.set |= FB_CUR_SETHOT;
        }

        if (cursor.set & FB_CUR_SETSIZE ||
            vc->vc_cursor_type != par->p->cursor_shape ||
            par->cursor_state.mask == NULL ||
            par->cursor_reset) {
                char *tmp, *mask = kmalloc_array(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_array(width, vc->vc_font.height, GFP_ATOMIC);

                if (!tmp) {
                        kfree(mask);
                        return;
                }

                kfree(par->cursor_state.mask);
                par->cursor_state.mask = mask;

                par->p->cursor_shape = vc->vc_cursor_type;
                cursor.set |= FB_CUR_SETSHAPE;

                switch (CUR_SIZE(par->p->cursor_shape)) {
                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);
        }

        par->cursor_state.enable = enable && !use_sw;

        cursor.image.data = src;
        cursor.image.fg_color = par->cursor_state.image.fg_color;
        cursor.image.bg_color = par->cursor_state.image.bg_color;
        cursor.image.dx = par->cursor_state.image.dx;
        cursor.image.dy = par->cursor_state.image.dy;
        cursor.image.height = par->cursor_state.image.height;
        cursor.image.width = par->cursor_state.image.width;
        cursor.hot.x = par->cursor_state.hot.x;
        cursor.hot.y = par->cursor_state.hot.y;
        cursor.mask = par->cursor_state.mask;
        cursor.enable = par->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);

        par->cursor_reset = 0;
}

static int ccw_update_start(struct fb_info *info)
{
        struct fbcon_par *par = info->fbcon_par;
        u32 yoffset;
        u32 vyres = GETVYRES(par->p, info);
        int err;

        yoffset = (vyres - info->var.yres) - par->var.xoffset;
        par->var.xoffset = par->var.yoffset;
        par->var.yoffset = yoffset;
        err = fb_pan_display(info, &par->var);
        par->var.xoffset = info->var.xoffset;
        par->var.yoffset = info->var.yoffset;
        par->var.vmode = info->var.vmode;
        return err;
}

static const struct fbcon_bitops ccw_fbcon_bitops = {
        .bmove = ccw_bmove,
        .clear = ccw_clear,
        .putcs = ccw_putcs,
        .clear_margins = ccw_clear_margins,
        .cursor = ccw_cursor,
        .update_start = ccw_update_start,
        .rotate_font = fbcon_rotate_font,
};

void fbcon_set_bitops_ccw(struct fbcon_par *par)
{
        par->bitops = &ccw_fbcon_bitops;
}