diff options
Diffstat (limited to 'grub-core/video/fb/fbfill.c')
| -rw-r--r-- | grub-core/video/fb/fbfill.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/grub-core/video/fb/fbfill.c b/grub-core/video/fb/fbfill.c new file mode 100644 index 0000000..49fa16b --- /dev/null +++ b/grub-core/video/fb/fbfill.c @@ -0,0 +1,212 @@ +/* + * 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); +} |