bitblit.c

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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/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"

/*
 * Accelerated handlers.
 */
static 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 = DIV_ROUND_UP(vc->vc_font.width, 8);
    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, info);
    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 = DIV_ROUND_UP(vc->vc_font.width, 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_ATOMIC);
        if (!buf)
            return;
    }

    while (count) {
        if (count > maxcnt)
            cnt = maxcnt;
        else
            cnt = count;

        image.width = vc->vc_font.width * cnt;
        pitch = DIV_ROUND_UP(image.width, 8) + 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, info);
    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 = DIV_ROUND_UP(vc->vc_font.width, 8), 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 <[email protected]>");
MODULE_DESCRIPTION("Bit Blitting Operation");
MODULE_LICENSE("GPL");