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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
/* SPECIAL NOTES!
Please note following when reading the code below:
- In this driver we assume that every memory can be accessed by same memory
bus. If there are different address spaces do not use this code as a base
code for other archs.
- Every function in this code assumes that bounds checking has been done in
previous phase and they are opted out in here. */
#include <grub/fbutil.h>
#include <grub/types.h>
#include <grub/video.h>
grub_video_color_t
get_pixel (struct grub_video_fbblit_info *source,
unsigned int x, unsigned int y)
{
grub_video_color_t color = 0;
switch (source->mode_info->bpp)
{
case 32:
color = *(grub_uint32_t *)grub_video_fb_get_video_ptr (source, x, y);
break;
case 24:
{
grub_uint8_t *ptr;
ptr = grub_video_fb_get_video_ptr (source, x, y);
#ifdef GRUB_CPU_WORDS_BIGENDIAN
color = ptr[2] | (ptr[1] << 8) | (ptr[0] << 16);
#else
color = ptr[0] | (ptr[1] << 8) | (ptr[2] << 16);
#endif
}
break;
case 16:
case 15:
color = *(grub_uint16_t *)grub_video_fb_get_video_ptr (source, x, y);
break;
case 8:
color = *(grub_uint8_t *)grub_video_fb_get_video_ptr (source, x, y);
break;
case 1:
if (source->mode_info->blit_format == GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED)
{
int bit_index = y * source->mode_info->width + x;
grub_uint8_t *ptr = source->data + bit_index / 8;
int bit_pos = 7 - bit_index % 8;
color = (*ptr >> bit_pos) & 0x01;
}
break;
default:
break;
}
return color;
}
void
set_pixel (struct grub_video_fbblit_info *source,
unsigned int x, unsigned int y, grub_video_color_t color)
{
switch (source->mode_info->bpp)
{
case 32:
{
grub_uint32_t *ptr;
ptr = (grub_uint32_t *)grub_video_fb_get_video_ptr (source, x, y);
*ptr = color;
}
break;
case 24:
{
grub_uint8_t *ptr;
#ifdef GRUB_CPU_WORDS_BIGENDIAN
grub_uint8_t *colorptr = ((grub_uint8_t *)&color) + 1;
#else
grub_uint8_t *colorptr = (grub_uint8_t *)&color;
#endif
ptr = grub_video_fb_get_video_ptr (source, x, y);
ptr[0] = colorptr[0];
ptr[1] = colorptr[1];
ptr[2] = colorptr[2];
}
break;
case 16:
case 15:
{
grub_uint16_t *ptr;
ptr = (grub_uint16_t *)grub_video_fb_get_video_ptr (source, x, y);
*ptr = (grub_uint16_t) (color & 0xFFFF);
}
break;
case 8:
{
grub_uint8_t *ptr;
ptr = (grub_uint8_t *)grub_video_fb_get_video_ptr (source, x, y);
*ptr = (grub_uint8_t) (color & 0xFF);
}
break;
case 1:
if (source->mode_info->blit_format == GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED)
{
int bit_index = y * source->mode_info->width + x;
grub_uint8_t *ptr = source->data + bit_index / 8;
int bit_pos = 7 - bit_index % 8;
*ptr = (*ptr & ~(1 << bit_pos)) | ((color & 0x01) << bit_pos);
}
break;
default:
break;
}
}
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