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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007,2008 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/video_fb.h>
#include <grub/fbfill.h>
#include <grub/fbutil.h>
#include <grub/types.h>
#include <grub/safemath.h>
#include <grub/video.h>
/* Generic filler that works for every supported mode. */
static void
grub_video_fbfill (struct grub_video_fbblit_info *dst,
grub_video_color_t color, int x, int y,
unsigned int width, unsigned int height)
{
unsigned int i, j;
for (j = 0; j < height; j++)
for (i = 0; i < width; i++)
set_pixel (dst, x + i, y + j, color);
}
/* Optimized filler for direct color 32 bit modes. It is assumed that color
is already mapped to destination format. */
static void
grub_video_fbfill_direct32 (struct grub_video_fbblit_info *dst,
grub_video_color_t color, int x, int y,
unsigned int width, unsigned int height)
{
unsigned int i, j;
grub_uint32_t *dstptr;
grub_size_t rowskip;
/* Calculate the number of bytes to advance from the end of one line
to the beginning of the next line. */
if (grub_mul (dst->mode_info->bytes_per_pixel, width, &rowskip) ||
grub_sub (dst->mode_info->pitch, rowskip, &rowskip))
return;
/* Get the start address. */
dstptr = grub_video_fb_get_video_ptr (dst, x, y);
for (j = 0; j < height; j++)
{
for (i = 0; i < width; i++)
*dstptr++ = color;
/* Advance the dest pointer to the right location on the next line. */
GRUB_VIDEO_FB_ADVANCE_POINTER (dstptr, rowskip);
}
}
/* Optimized filler for direct color 24 bit modes. It is assumed that color
is already mapped to destination format. */
static void
grub_video_fbfill_direct24 (struct grub_video_fbblit_info *dst,
grub_video_color_t color, int x, int y,
unsigned int width, unsigned int height)
{
unsigned int i, j;
grub_size_t rowskip;
grub_uint8_t *dstptr;
#ifndef GRUB_CPU_WORDS_BIGENDIAN
grub_uint8_t fill0 = (grub_uint8_t)((color >> 0) & 0xFF);
grub_uint8_t fill1 = (grub_uint8_t)((color >> 8) & 0xFF);
grub_uint8_t fill2 = (grub_uint8_t)((color >> 16) & 0xFF);
#else
grub_uint8_t fill2 = (grub_uint8_t)((color >> 0) & 0xFF);
grub_uint8_t fill1 = (grub_uint8_t)((color >> 8) & 0xFF);
grub_uint8_t fill0 = (grub_uint8_t)((color >> 16) & 0xFF);
#endif
/* Calculate the number of bytes to advance from the end of one line
to the beginning of the next line. */
if (grub_mul (dst->mode_info->bytes_per_pixel, width, &rowskip) ||
grub_sub (dst->mode_info->pitch, rowskip, &rowskip))
return;
/* Get the start address. */
dstptr = grub_video_fb_get_video_ptr (dst, x, y);
for (j = 0; j < height; j++)
{
for (i = 0; i < width; i++)
{
*dstptr++ = fill0;
*dstptr++ = fill1;
*dstptr++ = fill2;
}
/* Advance the dest pointer to the right location on the next line. */
dstptr += rowskip;
}
}
/* Optimized filler for direct color 16 bit modes. It is assumed that color
is already mapped to destination format. */
static void
grub_video_fbfill_direct16 (struct grub_video_fbblit_info *dst,
grub_video_color_t color, int x, int y,
unsigned int width, unsigned int height)
{
unsigned int i, j;
grub_size_t rowskip;
grub_uint16_t *dstptr;
/* Calculate the number of bytes to advance from the end of one line
to the beginning of the next line. */
if (grub_mul (dst->mode_info->bytes_per_pixel, width, &rowskip) ||
grub_sub (dst->mode_info->pitch, rowskip, &rowskip))
return;
/* Get the start address. */
dstptr = grub_video_fb_get_video_ptr (dst, x, y);
for (j = 0; j < height; j++)
{
for (i = 0; i < width; i++)
*dstptr++ = color;
/* Advance the dest pointer to the right location on the next line. */
GRUB_VIDEO_FB_ADVANCE_POINTER (dstptr, rowskip);
}
}
/* Optimized filler for index color. It is assumed that color
is already mapped to destination format. */
static void
grub_video_fbfill_direct8 (struct grub_video_fbblit_info *dst,
grub_video_color_t color, int x, int y,
unsigned int width, unsigned int height)
{
unsigned int i, j;
grub_size_t rowskip;
grub_uint8_t *dstptr;
grub_uint8_t fill = (grub_uint8_t)color & 0xFF;
/* Calculate the number of bytes to advance from the end of one line
to the beginning of the next line. */
if (grub_mul (dst->mode_info->bytes_per_pixel, width, &rowskip) ||
grub_sub (dst->mode_info->pitch, rowskip, &rowskip))
return;
/* Get the start address. */
dstptr = grub_video_fb_get_video_ptr (dst, x, y);
for (j = 0; j < height; j++)
{
for (i = 0; i < width; i++)
*dstptr++ = fill;
/* Advance the dest pointer to the right location on the next line. */
dstptr += rowskip;
}
}
void
grub_video_fb_fill_dispatch (struct grub_video_fbblit_info *target,
grub_video_color_t color, int x, int y,
unsigned int width, unsigned int height)
{
/* Try to figure out more optimized version. Note that color is already
mapped to target format so we can make assumptions based on that. */
switch (target->mode_info->bytes_per_pixel)
{
case 4:
grub_video_fbfill_direct32 (target, color, x, y,
width, height);
return;
case 3:
grub_video_fbfill_direct24 (target, color, x, y,
width, height);
return;
case 2:
grub_video_fbfill_direct16 (target, color, x, y,
width, height);
return;
case 1:
grub_video_fbfill_direct8 (target, color, x, y,
width, height);
return;
}
/* No optimized version found, use default (slow) filler. */
grub_video_fbfill (target, color, x, y, width, height);
}
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