fbcon_ud.c

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/*
 *  linux/drivers/video/console/fbcon_ud.c -- Software Rotation - 180 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 180 degrees
 */

static void ud_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 = 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 ud_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);
    u32 vxres = GETVXRES(ops->p->scrollmode, info);

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

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

static void ud_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);
    u32 vxres = GETVXRES(ops->p->scrollmode, info);

    region.color = attr_bgcol_ec(bgshift,vc,info);
    region.dy = vyres - ((sy + height) * vc->vc_font.height);
    region.dx = vxres - ((sx + width) *  vc->vc_font.width);
    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 ud_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.width >> 3;
    u8 *src;

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

        if (attr) {
            ud_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 ud_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)
{
    struct fbcon_ops *ops = info->fbcon_par;
    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 = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;

        if (attr) {
            ud_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 ud_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.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;
    u32 vyres = GETVYRES(ops->p->scrollmode, info);
    u32 vxres = GETVXRES(ops->p->scrollmode, info);

    if (!ops->fontbuffer)
        return;

    image.fg_color = fg;
    image.bg_color = bg;
    image.dy = vyres - ((yy * vc->vc_font.height) + vc->vc_font.height);
    image.dx = vxres - ((xx + count) * vc->vc_font.width);
    image.height = 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.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)
            ud_putcs_aligned(vc, info, s, attribute, cnt, pitch,
                     width, cellsize, &image, buf, dst);
        else
            ud_putcs_unaligned(vc, info, s, attribute, cnt, pitch,
                       width, cellsize, &image,
                       buf, dst);

        image.dx += image.width;
        count -= cnt;
        s -= cnt;
        xx += 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 ud_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.xres - (vc->vc_cols*cw);
    unsigned int bh = info->var.yres - (vc->vc_rows*ch);
    struct fb_fillrect region;
    int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;

    region.color = attr_bgcol_ec(bgshift,vc,info);
    region.rop = ROP_COPY;

    if (rw && !bottom_only) {
        region.dy = 0;
        region.dx = info->var.xoffset;
        region.width  = rw;
        region.height = info->var.yres_virtual;
        info->fbops->fb_fillrect(info, &region);
    }

    if (bh) {
        region.dy = info->var.yoffset;
        region.dx = info->var.xoffset;
                region.height  = bh;
                region.width = info->var.xres;
        info->fbops->fb_fillrect(info, &region);
    }
}

static void ud_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, dx, dy;
    char *src;
    u32 vyres = GETVYRES(ops->p->scrollmode, info);
    u32 vxres = GETVXRES(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.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;
        ud_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.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;
    }

    dy = vyres - ((y * vc->vc_font.height) + vc->vc_font.height);
    dx = vxres - ((vc->vc_x * vc->vc_font.width) + 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 *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 = cur_height * w;

        while (size--)
            mask[i++] = msk;

        size = (vc->vc_font.height - 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 ud_update_start(struct fb_info *info)
{
    struct fbcon_ops *ops = info->fbcon_par;
    int xoffset, yoffset;
    u32 vyres = GETVYRES(ops->p->scrollmode, info);
    u32 vxres = GETVXRES(ops->p->scrollmode, info);
    int err;

    xoffset = vxres - info->var.xres - ops->var.xoffset;
    yoffset = vyres - info->var.yres - ops->var.yoffset;
    if (yoffset < 0)
        yoffset += vyres;
    ops->var.xoffset = xoffset;
    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_ud(struct fbcon_ops *ops)
{
    ops->bmove = ud_bmove;
    ops->clear = ud_clear;
    ops->putcs = ud_putcs;
    ops->clear_margins = ud_clear_margins;
    ops->cursor = ud_cursor;
    ops->update_start = ud_update_start;
}
EXPORT_SYMBOL(fbcon_rotate_ud);

MODULE_AUTHOR("Antonino Daplas <[email protected]>");
MODULE_DESCRIPTION("Console Rotation (180 degrees) Support");
MODULE_LICENSE("GPL");