511 lines
13 KiB
C
511 lines
13 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/bitmap.h>
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#include <grub/types.h>
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/bufio.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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/* Uncomment following define to enable TGA debug. */
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//#define TGA_DEBUG
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#define dump_int_field(x) grub_dprintf ("tga", #x " = %d (0x%04x)\n", x, x);
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#if defined(TGA_DEBUG)
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static grub_command_t cmd;
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#endif
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enum
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{
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GRUB_TGA_IMAGE_TYPE_NONE = 0,
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GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR = 1,
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GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR = 2,
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GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE = 3,
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GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR = 9,
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GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR = 10,
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GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE = 11,
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};
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enum
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{
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GRUB_TGA_COLOR_MAP_TYPE_NONE = 0,
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GRUB_TGA_COLOR_MAP_TYPE_INCLUDED = 1
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};
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enum
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{
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GRUB_TGA_IMAGE_ORIGIN_RIGHT = 0x10,
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GRUB_TGA_IMAGE_ORIGIN_TOP = 0x20
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};
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struct grub_tga_header
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{
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grub_uint8_t id_length;
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grub_uint8_t color_map_type;
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grub_uint8_t image_type;
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/* Color Map Specification. */
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grub_uint16_t color_map_first_index;
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grub_uint16_t color_map_length;
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grub_uint8_t color_map_bpp;
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/* Image Specification. */
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grub_uint16_t image_x_origin;
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grub_uint16_t image_y_origin;
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grub_uint16_t image_width;
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grub_uint16_t image_height;
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grub_uint8_t image_bpp;
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grub_uint8_t image_descriptor;
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} GRUB_PACKED;
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struct tga_data
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{
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struct grub_tga_header hdr;
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int uses_rle;
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int pktlen;
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int bpp;
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int is_rle;
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grub_uint8_t pixel[4];
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grub_uint8_t palette[256][3];
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struct grub_video_bitmap *bitmap;
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grub_file_t file;
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unsigned image_width;
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unsigned image_height;
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};
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static grub_err_t
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fetch_pixel (struct tga_data *data)
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{
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if (!data->uses_rle)
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{
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if (grub_file_read (data->file, &data->pixel[0], data->bpp)
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!= data->bpp)
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return grub_errno;
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return GRUB_ERR_NONE;
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}
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if (!data->pktlen)
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{
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grub_uint8_t type;
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if (grub_file_read (data->file, &type, sizeof (type)) != sizeof(type))
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return grub_errno;
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data->is_rle = !!(type & 0x80);
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data->pktlen = (type & 0x7f) + 1;
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if (data->is_rle && grub_file_read (data->file, &data->pixel[0], data->bpp)
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!= data->bpp)
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return grub_errno;
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}
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if (!data->is_rle && grub_file_read (data->file, &data->pixel[0], data->bpp)
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!= data->bpp)
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return grub_errno;
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data->pktlen--;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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tga_load_palette (struct tga_data *data)
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{
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grub_size_t len = grub_le_to_cpu32 (data->hdr.color_map_length) * 3;
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if (len > sizeof (data->palette))
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len = sizeof (data->palette);
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if (grub_file_read (data->file, &data->palette, len)
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!= (grub_ssize_t) len)
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return grub_errno;
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#ifndef GRUB_CPU_WORDS_BIGENDIAN
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{
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grub_size_t i;
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for (i = 0; 3 * i < len; i++)
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{
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grub_uint8_t t;
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t = data->palette[i][0];
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data->palette[i][0] = data->palette[i][2];
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data->palette[i][2] = t;
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}
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}
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#endif
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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tga_load_index_color (struct tga_data *data)
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{
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unsigned int x;
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unsigned int y;
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grub_uint8_t *ptr;
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for (y = 0; y < data->image_height; y++)
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{
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ptr = data->bitmap->data;
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if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
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ptr += y * data->bitmap->mode_info.pitch;
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else
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ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
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for (x = 0; x < data->image_width; x++)
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{
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grub_err_t err;
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err = fetch_pixel (data);
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if (err)
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return err;
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ptr[0] = data->palette[data->pixel[0]][0];
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ptr[1] = data->palette[data->pixel[0]][1];
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ptr[2] = data->palette[data->pixel[0]][2];
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ptr += 3;
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}
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}
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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tga_load_grayscale (struct tga_data *data)
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{
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unsigned int x;
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unsigned int y;
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grub_uint8_t *ptr;
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for (y = 0; y < data->image_height; y++)
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{
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ptr = data->bitmap->data;
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if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
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ptr += y * data->bitmap->mode_info.pitch;
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else
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ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
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for (x = 0; x < data->image_width; x++)
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{
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grub_err_t err;
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err = fetch_pixel (data);
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if (err)
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return err;
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ptr[0] = data->pixel[0];
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ptr[1] = data->pixel[0];
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ptr[2] = data->pixel[0];
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ptr += 3;
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}
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}
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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tga_load_truecolor_R8G8B8 (struct tga_data *data)
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{
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unsigned int x;
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unsigned int y;
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grub_uint8_t *ptr;
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for (y = 0; y < data->image_height; y++)
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{
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ptr = data->bitmap->data;
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if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
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ptr += y * data->bitmap->mode_info.pitch;
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else
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ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
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for (x = 0; x < data->image_width; x++)
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{
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grub_err_t err;
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err = fetch_pixel (data);
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if (err)
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return err;
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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ptr[0] = data->pixel[0];
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ptr[1] = data->pixel[1];
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ptr[2] = data->pixel[2];
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#else
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ptr[0] = data->pixel[2];
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ptr[1] = data->pixel[1];
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ptr[2] = data->pixel[0];
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#endif
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ptr += 3;
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}
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}
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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tga_load_truecolor_R8G8B8A8 (struct tga_data *data)
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{
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unsigned int x;
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unsigned int y;
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grub_uint8_t *ptr;
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for (y = 0; y < data->image_height; y++)
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{
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ptr = data->bitmap->data;
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if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
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ptr += y * data->bitmap->mode_info.pitch;
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else
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ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
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for (x = 0; x < data->image_width; x++)
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{
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grub_err_t err;
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err = fetch_pixel (data);
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if (err)
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return err;
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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ptr[0] = data->pixel[0];
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ptr[1] = data->pixel[1];
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ptr[2] = data->pixel[2];
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ptr[3] = data->pixel[3];
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#else
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ptr[0] = data->pixel[2];
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ptr[1] = data->pixel[1];
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ptr[2] = data->pixel[0];
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ptr[3] = data->pixel[3];
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#endif
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ptr += 4;
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}
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}
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_video_reader_tga (struct grub_video_bitmap **bitmap,
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const char *filename)
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{
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grub_ssize_t pos;
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struct tga_data data;
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grub_memset (&data, 0, sizeof (data));
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data.file = grub_buffile_open (filename, 0);
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if (! data.file)
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return grub_errno;
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/* TGA Specification states that we SHOULD start by reading
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ID from end of file, but we really don't care about that as we are
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not going to support developer area & extensions at this point. */
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/* Read TGA header from beginning of file. */
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if (grub_file_read (data.file, &data.hdr, sizeof (data.hdr))
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!= sizeof (data.hdr))
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{
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grub_file_close (data.file);
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return grub_errno;
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}
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/* Skip ID field. */
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pos = grub_file_tell (data.file);
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pos += data.hdr.id_length;
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grub_file_seek (data.file, pos);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_file_close (data.file);
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return grub_errno;
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}
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grub_dprintf("tga", "tga: header\n");
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dump_int_field(data.hdr.id_length);
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dump_int_field(data.hdr.color_map_type);
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dump_int_field(data.hdr.image_type);
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dump_int_field(data.hdr.color_map_first_index);
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dump_int_field(data.hdr.color_map_length);
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dump_int_field(data.hdr.color_map_bpp);
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dump_int_field(data.hdr.image_x_origin);
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dump_int_field(data.hdr.image_y_origin);
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dump_int_field(data.hdr.image_width);
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dump_int_field(data.hdr.image_height);
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dump_int_field(data.hdr.image_bpp);
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dump_int_field(data.hdr.image_descriptor);
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data.image_width = grub_le_to_cpu16 (data.hdr.image_width);
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data.image_height = grub_le_to_cpu16 (data.hdr.image_height);
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/* Check that bitmap encoding is supported. */
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switch (data.hdr.image_type)
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{
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case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
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case GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE:
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case GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR:
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data.uses_rle = 1;
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break;
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case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
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case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE:
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case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR:
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data.uses_rle = 0;
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break;
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default:
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grub_file_close (data.file);
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"unsupported bitmap format (unknown encoding %d)", data.hdr.image_type);
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}
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data.bpp = data.hdr.image_bpp / 8;
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/* Check that bitmap depth is supported. */
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switch (data.hdr.image_type)
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{
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case GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE:
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case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE:
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if (data.hdr.image_bpp != 8)
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{
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grub_file_close (data.file);
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"unsupported bitmap format (bpp=%d)",
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data.hdr.image_bpp);
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}
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grub_video_bitmap_create (bitmap, data.image_width,
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data.image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGB_888);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_file_close (data.file);
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return grub_errno;
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}
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data.bitmap = *bitmap;
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/* Load bitmap data. */
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tga_load_grayscale (&data);
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break;
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case GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR:
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case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR:
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if (data.hdr.image_bpp != 8
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|| data.hdr.color_map_bpp != 24
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|| data.hdr.color_map_first_index != 0)
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{
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grub_file_close (data.file);
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"unsupported bitmap format (bpp=%d)",
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data.hdr.image_bpp);
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}
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grub_video_bitmap_create (bitmap, data.image_width,
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data.image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGB_888);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_file_close (data.file);
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return grub_errno;
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}
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data.bitmap = *bitmap;
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/* Load bitmap data. */
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tga_load_palette (&data);
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tga_load_index_color (&data);
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break;
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case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
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case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
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switch (data.hdr.image_bpp)
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{
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case 24:
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grub_video_bitmap_create (bitmap, data.image_width,
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data.image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGB_888);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_file_close (data.file);
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return grub_errno;
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}
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data.bitmap = *bitmap;
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/* Load bitmap data. */
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tga_load_truecolor_R8G8B8 (&data);
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break;
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case 32:
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grub_video_bitmap_create (bitmap, data.image_width,
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data.image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGBA_8888);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_file_close (data.file);
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return grub_errno;
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}
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data.bitmap = *bitmap;
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/* Load bitmap data. */
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tga_load_truecolor_R8G8B8A8 (&data);
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break;
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default:
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grub_file_close (data.file);
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"unsupported bitmap format (bpp=%d)",
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data.hdr.image_bpp);
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}
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}
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/* If there was a loading problem, destroy bitmap. */
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_video_bitmap_destroy (*bitmap);
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*bitmap = 0;
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}
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grub_file_close (data.file);
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return grub_errno;
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}
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#if defined(TGA_DEBUG)
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static grub_err_t
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grub_cmd_tgatest (grub_command_t cmd_d __attribute__ ((unused)),
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int argc, char **args)
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{
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struct grub_video_bitmap *bitmap = 0;
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
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grub_video_reader_tga (&bitmap, args[0]);
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if (grub_errno != GRUB_ERR_NONE)
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return grub_errno;
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grub_video_bitmap_destroy (bitmap);
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return GRUB_ERR_NONE;
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}
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#endif
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static struct grub_video_bitmap_reader tga_reader = {
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.extension = ".tga",
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.reader = grub_video_reader_tga,
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.next = 0
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};
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GRUB_MOD_INIT(tga)
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{
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grub_video_bitmap_reader_register (&tga_reader);
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#if defined(TGA_DEBUG)
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cmd = grub_register_command ("tgatest", grub_cmd_tgatest,
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"FILE", "Tests loading of TGA bitmap.");
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#endif
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}
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GRUB_MOD_FINI(tga)
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{
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#if defined(TGA_DEBUG)
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grub_unregister_command (cmd);
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#endif
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grub_video_bitmap_reader_unregister (&tga_reader);
|
|
}
|