diff options
Diffstat (limited to 'grub-core/font/font.c')
| -rw-r--r-- | grub-core/font/font.c | 1611 |
1 files changed, 1611 insertions, 0 deletions
diff --git a/grub-core/font/font.c b/grub-core/font/font.c new file mode 100644 index 0000000..d09bb38 --- /dev/null +++ b/grub-core/font/font.c @@ -0,0 +1,1611 @@ +/* font.c - Font API and font file loader. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2003,2005,2006,2007,2008,2009,2010 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/>. + */ + +#include <grub/bufio.h> +#include <grub/dl.h> +#include <grub/file.h> +#include <grub/font.h> +#include <grub/misc.h> +#include <grub/mm.h> +#include <grub/types.h> +#include <grub/video.h> +#include <grub/bitmap.h> +#include <grub/charset.h> +#include <grub/unicode.h> +#include <grub/fontformat.h> +#include <grub/env.h> +#include <grub/safemath.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#if HAVE_FONT_SOURCE +#include "ascii.h" +#endif + +#ifndef FONT_DEBUG +#define FONT_DEBUG 0 +#endif + +struct char_index_entry +{ + grub_uint32_t code; + grub_uint8_t storage_flags; + grub_uint32_t offset; + + /* Glyph if loaded, or NULL otherwise. */ + struct grub_font_glyph *glyph; +}; + +#define FONT_WEIGHT_NORMAL 100 +#define FONT_WEIGHT_BOLD 200 +#define ASCII_BITMAP_SIZE 16 + +/* Definition of font registry. */ +struct grub_font_node *grub_font_list; + +static int register_font (grub_font_t font); +static void font_init (grub_font_t font); +static void free_font (grub_font_t font); +static void remove_font (grub_font_t font); + +struct font_file_section +{ + /* The file this section is in. */ + grub_file_t file; + + /* FOURCC name of the section. */ + char name[4]; + + /* Length of the section contents. */ + grub_uint32_t length; + + /* Set by open_section() on EOF. */ + int eof; +}; + +/* Replace unknown glyphs with a rounded question mark. */ +static grub_uint8_t unknown_glyph_bitmap[] = { + /* 76543210 */ + 0x7C, /* ooooo */ + 0x82, /* o o */ + 0xBA, /* o ooo o */ + 0xAA, /* o o o o */ + 0xAA, /* o o o o */ + 0x8A, /* o o o */ + 0x9A, /* o oo o */ + 0x92, /* o o o */ + 0x92, /* o o o */ + 0x92, /* o o o */ + 0x92, /* o o o */ + 0x82, /* o o */ + 0x92, /* o o o */ + 0x82, /* o o */ + 0x7C, /* ooooo */ + 0x00 /* */ +}; + +/* The "unknown glyph" glyph, used as a last resort. */ +static struct grub_font_glyph *unknown_glyph; + +/* The font structure used when no other font is loaded. This functions + as a "Null Object" pattern, so that code everywhere does not have to + check for a NULL grub_font_t to avoid dereferencing a null pointer. */ +static struct grub_font null_font; + +/* Flag to ensure module is initialized only once. */ +static grub_uint8_t font_loader_initialized; + +#if HAVE_FONT_SOURCE +static struct grub_font_glyph *ascii_font_glyph[0x80]; +#endif + +static struct grub_font_glyph * +ascii_glyph_lookup (grub_uint32_t code) +{ +#if HAVE_FONT_SOURCE + static int ascii_failback_initialized = 0; + + if (code >= 0x80) + return NULL; + + if (ascii_failback_initialized == 0) + { + int current; + for (current = 0; current < 0x80; current++) + { + ascii_font_glyph[current] = + grub_malloc (sizeof (struct grub_font_glyph) + ASCII_BITMAP_SIZE); + + ascii_font_glyph[current]->width = 8; + ascii_font_glyph[current]->height = 16; + ascii_font_glyph[current]->offset_x = 0; + ascii_font_glyph[current]->offset_y = -2; + ascii_font_glyph[current]->device_width = 8; + ascii_font_glyph[current]->font = NULL; + + grub_memcpy (ascii_font_glyph[current]->bitmap, + &ascii_bitmaps[current * ASCII_BITMAP_SIZE], + ASCII_BITMAP_SIZE); + } + + ascii_failback_initialized = 1; + } + + return ascii_font_glyph[code]; +#else + (void) code; + return NULL; +#endif +} + +void +grub_font_loader_init (void) +{ + /* Only initialize font loader once. */ + if (font_loader_initialized) + return; + + /* Make glyph for unknown glyph. */ + unknown_glyph = grub_malloc (sizeof (struct grub_font_glyph) + + sizeof (unknown_glyph_bitmap)); + if (!unknown_glyph) + return; + + unknown_glyph->width = 8; + unknown_glyph->height = 16; + unknown_glyph->offset_x = 0; + unknown_glyph->offset_y = -3; + unknown_glyph->device_width = 8; + grub_memcpy (unknown_glyph->bitmap, + unknown_glyph_bitmap, sizeof (unknown_glyph_bitmap)); + + /* Initialize the null font. */ + font_init (&null_font); + /* FIXME: Fix this slightly improper cast. */ + null_font.name = (char *) "<No Font>"; + null_font.ascent = unknown_glyph->height - 3; + null_font.descent = 3; + null_font.max_char_width = unknown_glyph->width; + null_font.max_char_height = unknown_glyph->height; + + font_loader_initialized = 1; +} + +/* Initialize the font object with initial default values. */ +static void +font_init (grub_font_t font) +{ + font->name = 0; + font->file = 0; + font->family = 0; + font->point_size = 0; + font->weight = 0; + + /* Default leading value, not in font file yet. */ + font->leading = 1; + + font->max_char_width = 0; + font->max_char_height = 0; + font->ascent = 0; + font->descent = 0; + font->num_chars = 0; + font->char_index = 0; + font->bmp_idx = 0; +} + +/* Open the next section in the file. + + On success, the section name is stored in section->name and the length in + section->length, and 0 is returned. On failure, 1 is returned and + grub_errno is set appropriately with an error message. + + If 1 is returned due to being at the end of the file, then section->eof is + set to 1; otherwise, section->eof is set to 0. */ +static int +open_section (grub_file_t file, struct font_file_section *section) +{ + grub_ssize_t retval; + grub_uint32_t raw_length; + + section->file = file; + section->eof = 0; + + /* Read the FOURCC section name. */ + retval = grub_file_read (file, section->name, 4); + if (retval >= 0 && retval < 4) + { + /* EOF encountered. */ + section->eof = 1; + return 1; + } + else if (retval < 0) + { + /* Read error. */ + return 1; + } + + /* Read the big-endian 32-bit section length. */ + retval = grub_file_read (file, &raw_length, 4); + if (retval >= 0 && retval < 4) + { + /* EOF encountered. */ + section->eof = 1; + return 1; + } + else if (retval < 0) + { + /* Read error. */ + return 1; + } + + /* Convert byte-order and store in *length. */ + section->length = grub_be_to_cpu32 (raw_length); + + return 0; +} + +/* Size in bytes of each character index (CHIX section) + entry in the font file. */ +#define FONT_CHAR_INDEX_ENTRY_SIZE (4 + 1 + 4) + +/* Load the character index (CHIX) section contents from the font file. This + presumes that the position of FILE is positioned immediately after the + section length for the CHIX section (i.e., at the start of the section + contents). Returns 0 upon success, nonzero for failure (in which case + grub_errno is set appropriately). */ +static int +load_font_index (grub_file_t file, grub_uint32_t sect_length, struct + grub_font *font) +{ + unsigned i; + grub_uint32_t last_code; + +#if FONT_DEBUG >= 2 + grub_dprintf ("font", "load_font_index(sect_length=%d)\n", sect_length); +#endif + + /* Sanity check: ensure section length is divisible by the entry size. */ + if ((sect_length % FONT_CHAR_INDEX_ENTRY_SIZE) != 0) + { + grub_error (GRUB_ERR_BAD_FONT, + "font file format error: character index length %d " + "is not a multiple of the entry size %d", + sect_length, FONT_CHAR_INDEX_ENTRY_SIZE); + return 1; + } + + /* Calculate the number of characters. */ + font->num_chars = sect_length / FONT_CHAR_INDEX_ENTRY_SIZE; + + /* Allocate the character index array. */ + font->char_index = grub_calloc (font->num_chars, sizeof (struct char_index_entry)); + if (!font->char_index) + return 1; + font->bmp_idx = grub_malloc (0x10000 * sizeof (grub_uint16_t)); + if (!font->bmp_idx) + return 1; + grub_memset (font->bmp_idx, 0xff, 0x10000 * sizeof (grub_uint16_t)); + + +#if FONT_DEBUG >= 2 + grub_dprintf ("font", "num_chars=%d)\n", font->num_chars); +#endif + + last_code = 0; + + /* Load the character index data from the file. */ + for (i = 0; i < font->num_chars; i++) + { + struct char_index_entry *entry = &font->char_index[i]; + + /* Read code point value; convert to native byte order. */ + if (grub_file_read (file, &entry->code, 4) != 4) + return 1; + entry->code = grub_be_to_cpu32 (entry->code); + + /* Verify that characters are in ascending order. */ + if (i != 0 && entry->code <= last_code) + { + grub_error (GRUB_ERR_BAD_FONT, + "font characters not in ascending order: %u <= %u", + entry->code, last_code); + return 1; + } + + if (entry->code < 0x10000) + font->bmp_idx[entry->code] = i; + + last_code = entry->code; + + /* Read storage flags byte. */ + if (grub_file_read (file, &entry->storage_flags, 1) != 1) + return 1; + + /* Read glyph data offset; convert to native byte order. */ + if (grub_file_read (file, &entry->offset, 4) != 4) + return 1; + entry->offset = grub_be_to_cpu32 (entry->offset); + + /* No glyph loaded. Will be loaded on demand and cached thereafter. */ + entry->glyph = 0; + +#if FONT_DEBUG >= 5 + /* Print the 1st 10 characters. */ + if (i < 10) + grub_dprintf ("font", "c=%d o=%d\n", entry->code, entry->offset); +#endif + } + + return 0; +} + +/* Read the contents of the specified section as a string, which is + allocated on the heap. Returns 0 if there is an error. */ +static char * +read_section_as_string (struct font_file_section *section) +{ + char *str; + grub_size_t sz; + grub_ssize_t ret; + + if (grub_add (section->length, 1, &sz)) + return NULL; + + str = grub_malloc (sz); + if (!str) + return 0; + + ret = grub_file_read (section->file, str, section->length); + if (ret < 0 || ret != (grub_ssize_t) section->length) + { + grub_free (str); + return 0; + } + + str[section->length] = '\0'; + return str; +} + +/* Read the contents of the current section as a 16-bit integer value, + which is stored into *VALUE. + Returns 0 upon success, nonzero upon failure. */ +static int +read_section_as_short (struct font_file_section *section, + grub_int16_t * value) +{ + grub_uint16_t raw_value; + + if (section->length != 2) + { + grub_error (GRUB_ERR_BAD_FONT, + "font file format error: section %c%c%c%c length " + "is %d but should be 2", + section->name[0], section->name[1], + section->name[2], section->name[3], section->length); + return 1; + } + if (grub_file_read (section->file, &raw_value, 2) != 2) + return 1; + + *value = grub_be_to_cpu16 (raw_value); + return 0; +} + +/* Load a font and add it to the beginning of the global font list. + Returns 0 upon success, nonzero upon failure. */ +grub_font_t +grub_font_load (const char *filename) +{ + grub_file_t file = 0; + struct font_file_section section; + char magic[4]; + grub_font_t font = 0; + +#if FONT_DEBUG >= 1 + grub_dprintf ("font", "add_font(%s)\n", filename); +#endif + + if (filename[0] == '(' || filename[0] == '/' || filename[0] == '+') + file = grub_buffile_open (filename, GRUB_FILE_TYPE_FONT, 1024); + else + { + const char *prefix = grub_env_get ("prefix"); + char *fullname, *ptr; + if (!prefix) + { + grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("variable `%s' isn't set"), + "prefix"); + goto fail; + } + fullname = grub_malloc (grub_strlen (prefix) + grub_strlen (filename) + 1 + + sizeof ("/fonts/") + sizeof (".pf2")); + if (!fullname) + goto fail; + ptr = grub_stpcpy (fullname, prefix); + ptr = grub_stpcpy (ptr, "/fonts/"); + ptr = grub_stpcpy (ptr, filename); + ptr = grub_stpcpy (ptr, ".pf2"); + *ptr = 0; + file = grub_buffile_open (fullname, GRUB_FILE_TYPE_FONT, 1024); + grub_free (fullname); + } + if (!file) + goto fail; + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "file opened\n"); +#endif + + /* Read the FILE section. It indicates the file format. */ + if (open_section (file, §ion) != 0) + goto fail; + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "opened FILE section\n"); +#endif + if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_FILE, + sizeof (FONT_FORMAT_SECTION_NAMES_FILE) - 1) != 0) + { + grub_error (GRUB_ERR_BAD_FONT, + "font file format error: 1st section must be FILE"); + goto fail; + } + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "section name ok\n"); +#endif + if (section.length != 4) + { + grub_error (GRUB_ERR_BAD_FONT, + "font file format error (file type ID length is %d " + "but should be 4)", section.length); + goto fail; + } + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "section length ok\n"); +#endif + /* Check the file format type code. */ + if (grub_file_read (file, magic, 4) != 4) + goto fail; + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "read magic ok\n"); +#endif + + if (grub_memcmp (magic, FONT_FORMAT_PFF2_MAGIC, 4) != 0) + { + grub_error (GRUB_ERR_BAD_FONT, "invalid font magic %x %x %x %x", + magic[0], magic[1], magic[2], magic[3]); + goto fail; + } + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "compare magic ok\n"); +#endif + + /* Allocate the font object. */ + font = (grub_font_t) grub_zalloc (sizeof (struct grub_font)); + if (!font) + goto fail; + + font_init (font); + font->file = file; + +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "allocate font ok; loading font info\n"); +#endif + + /* Load the font information. */ + while (1) + { + if (open_section (file, §ion) != 0) + { + if (section.eof) + break; /* Done reading the font file. */ + else + goto fail; + } + +#if FONT_DEBUG >= 2 + grub_dprintf ("font", "opened section %c%c%c%c ok\n", + section.name[0], section.name[1], + section.name[2], section.name[3]); +#endif + + if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_FONT_NAME, + sizeof (FONT_FORMAT_SECTION_NAMES_FONT_NAME) - 1) == 0) + { + if (font->name != NULL) + { + grub_error (GRUB_ERR_BAD_FONT, "invalid font file: too many NAME sections"); + goto fail; + } + + font->name = read_section_as_string (§ion); + if (!font->name) + goto fail; + } + else if (grub_memcmp (section.name, + FONT_FORMAT_SECTION_NAMES_POINT_SIZE, + sizeof (FONT_FORMAT_SECTION_NAMES_POINT_SIZE) - + 1) == 0) + { + if (read_section_as_short (§ion, &font->point_size) != 0) + goto fail; + } + else if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_WEIGHT, + sizeof (FONT_FORMAT_SECTION_NAMES_WEIGHT) - 1) + == 0) + { + char *wt; + wt = read_section_as_string (§ion); + if (!wt) + continue; + /* Convert the weight string 'normal' or 'bold' into a number. */ + if (grub_strcmp (wt, "normal") == 0) + font->weight = FONT_WEIGHT_NORMAL; + else if (grub_strcmp (wt, "bold") == 0) + font->weight = FONT_WEIGHT_BOLD; + grub_free (wt); + } + else if (grub_memcmp (section.name, + FONT_FORMAT_SECTION_NAMES_MAX_CHAR_WIDTH, + sizeof (FONT_FORMAT_SECTION_NAMES_MAX_CHAR_WIDTH) + - 1) == 0) + { + if (read_section_as_short (§ion, &font->max_char_width) != 0) + goto fail; + } + else if (grub_memcmp (section.name, + FONT_FORMAT_SECTION_NAMES_MAX_CHAR_HEIGHT, + sizeof (FONT_FORMAT_SECTION_NAMES_MAX_CHAR_HEIGHT) + - 1) == 0) + { + if (read_section_as_short (§ion, &font->max_char_height) != 0) + goto fail; + } + else if (grub_memcmp (section.name, + FONT_FORMAT_SECTION_NAMES_ASCENT, + sizeof (FONT_FORMAT_SECTION_NAMES_ASCENT) - 1) + == 0) + { + if (read_section_as_short (§ion, &font->ascent) != 0) + goto fail; + } + else if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_DESCENT, + sizeof (FONT_FORMAT_SECTION_NAMES_DESCENT) - 1) + == 0) + { + if (read_section_as_short (§ion, &font->descent) != 0) + goto fail; + } + else if (grub_memcmp (section.name, + FONT_FORMAT_SECTION_NAMES_CHAR_INDEX, + sizeof (FONT_FORMAT_SECTION_NAMES_CHAR_INDEX) - + 1) == 0) + { + if (load_font_index (file, section.length, font) != 0) + goto fail; + } + else if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_DATA, + sizeof (FONT_FORMAT_SECTION_NAMES_DATA) - 1) == 0) + { + /* When the DATA section marker is reached, we stop reading. */ + break; + } + else + { + /* Unhandled section type, simply skip past it. */ +#if FONT_DEBUG >= 3 + grub_dprintf ("font", "Unhandled section type, skipping.\n"); +#endif + grub_off_t section_end = grub_file_tell (file) + section.length; + if ((int) grub_file_seek (file, section_end) == -1) + goto fail; + } + } + + if (!font->name) + { + grub_dprintf ("font", "Font has no name.\n"); + font->name = grub_strdup ("Unknown"); + } + +#if FONT_DEBUG >= 1 + grub_dprintf ("font", "Loaded font `%s'.\n" + "Ascent=%d Descent=%d MaxW=%d MaxH=%d Number of characters=%d.\n", + font->name, + font->ascent, font->descent, + font->max_char_width, font->max_char_height, font->num_chars); +#endif + + if (font->max_char_width == 0 + || font->max_char_height == 0 + || font->num_chars == 0 + || font->char_index == 0 || font->ascent == 0 || font->descent == 0) + { + grub_error (GRUB_ERR_BAD_FONT, + "invalid font file: missing some required data"); + goto fail; + } + + /* Add the font to the global font registry. */ + if (register_font (font) != 0) + goto fail; + + return font; + +fail: + if (file) + grub_file_close (file); + if (font) + font->file = 0; + + free_font (font); + return 0; +} + +/* Read a 16-bit big-endian integer from FILE, convert it to native byte + order, and store it in *VALUE. + Returns 0 on success, 1 on failure. */ +static int +read_be_uint16 (grub_file_t file, grub_uint16_t * value) +{ + if (grub_file_read (file, value, 2) != 2) + return 1; + *value = grub_be_to_cpu16 (*value); + return 0; +} + +static int +read_be_int16 (grub_file_t file, grub_int16_t * value) +{ + /* For the signed integer version, use the same code as for unsigned. */ + return read_be_uint16 (file, (grub_uint16_t *) value); +} + +/* Return a pointer to the character index entry for the glyph corresponding to + the codepoint CODE in the font FONT. If not found, return zero. */ +static inline struct char_index_entry * +find_glyph (const grub_font_t font, grub_uint32_t code) +{ + struct char_index_entry *table; + grub_size_t lo; + grub_size_t hi; + grub_size_t mid; + + table = font->char_index; + + /* Use BMP index if possible. */ + if (code < 0x10000 && font->bmp_idx) + { + if (font->bmp_idx[code] == 0xffff) + return 0; + return &table[font->bmp_idx[code]]; + } + + /* Do a binary search in `char_index', which is ordered by code point. */ + lo = 0; + hi = font->num_chars - 1; + + if (!table) + return 0; + + while (lo <= hi) + { + mid = lo + (hi - lo) / 2; + if (code < table[mid].code) + hi = mid - 1; + else if (code > table[mid].code) + lo = mid + 1; + else + return &table[mid]; + } + + return 0; +} + +/* Get a glyph for the Unicode character CODE in FONT. The glyph is loaded + from the font file if has not been loaded yet. + Returns a pointer to the glyph if found, or 0 if it is not found. */ +static struct grub_font_glyph * +grub_font_get_glyph_internal (grub_font_t font, grub_uint32_t code) +{ + struct char_index_entry *index_entry; + + index_entry = find_glyph (font, code); + if (index_entry) + { + struct grub_font_glyph *glyph = 0; + grub_uint16_t width; + grub_uint16_t height; + grub_int16_t xoff; + grub_int16_t yoff; + grub_int16_t dwidth; + int len; + + if (index_entry->glyph) + /* Return cached glyph. */ + return index_entry->glyph; + + if (!font->file) + /* No open file, can't load any glyphs. */ + return 0; + + /* Make sure we can find glyphs for error messages. Push active + error message to error stack and reset error message. */ + grub_error_push (); + + grub_file_seek (font->file, index_entry->offset); + + /* Read the glyph width, height, and baseline. */ + if (read_be_uint16 (font->file, &width) != 0 + || read_be_uint16 (font->file, &height) != 0 + || read_be_int16 (font->file, &xoff) != 0 + || read_be_int16 (font->file, &yoff) != 0 + || read_be_int16 (font->file, &dwidth) != 0) + { + remove_font (font); + return 0; + } + + len = (width * height + 7) / 8; + glyph = grub_malloc (sizeof (struct grub_font_glyph) + len); + if (!glyph) + { + remove_font (font); + return 0; + } + + glyph->font = font; + glyph->width = width; + glyph->height = height; + glyph->offset_x = xoff; + glyph->offset_y = yoff; + glyph->device_width = dwidth; + + /* Don't try to read empty bitmaps (e.g., space characters). */ + if (len != 0) + { + if (grub_file_read (font->file, glyph->bitmap, len) != len) + { + remove_font (font); + grub_free (glyph); + return 0; + } + } + + /* Restore old error message. */ + grub_error_pop (); + + /* Cache the glyph. */ + index_entry->glyph = glyph; + + return glyph; + } + + return 0; +} + +/* Free the memory used by FONT. + This should not be called if the font has been made available to + users (once it is added to the global font list), since there would + be the possibility of a dangling pointer. */ +static void +free_font (grub_font_t font) +{ + if (font) + { + if (font->file) + grub_file_close (font->file); + grub_free (font->name); + grub_free (font->family); + grub_free (font->char_index); + grub_free (font->bmp_idx); + grub_free (font); + } +} + +/* Add FONT to the global font registry. + Returns 0 upon success, nonzero on failure + (the font was not registered). */ +static int +register_font (grub_font_t font) +{ + struct grub_font_node *node = 0; + + node = grub_malloc (sizeof (struct grub_font_node)); + if (!node) + return 1; + + node->value = font; + node->next = grub_font_list; + grub_font_list = node; + + return 0; +} + +/* Remove the font from the global font list. We don't actually free the + font's memory since users could be holding references to the font. */ +static void +remove_font (grub_font_t font) +{ + struct grub_font_node **nextp, *cur; + + for (nextp = &grub_font_list, cur = *nextp; + cur; nextp = &cur->next, cur = cur->next) + { + if (cur->value == font) + { + *nextp = cur->next; + + /* Free the node, but not the font itself. */ + grub_free (cur); + + return; + } + } +} + +/* Get a font from the list of loaded fonts. This function will return + another font if the requested font is not available. If no fonts are + loaded, then a special 'null font' is returned, which contains no glyphs, + but is not a null pointer so the caller may omit checks for NULL. */ +grub_font_t +grub_font_get (const char *font_name) +{ + struct grub_font_node *node; + + for (node = grub_font_list; node; node = node->next) + { + grub_font_t font = node->value; + if (grub_strcmp (font->name, font_name) == 0) + return font; + } + + /* If no font by that name is found, return the first font in the list + as a fallback. */ + if (grub_font_list && grub_font_list->value) + return grub_font_list->value; + else + /* The null_font is a last resort. */ + return &null_font; +} + +/* Get the full name of the font. */ +const char * +grub_font_get_name (grub_font_t font) +{ + return font->name; +} + +/* Get the maximum width of any character in the font in pixels. */ +int +grub_font_get_max_char_width (grub_font_t font) +{ + return font->max_char_width; +} + +/* Get the distance in pixels from the baseline to the lowest descenders + (for instance, in a lowercase 'y', 'g', etc.). */ +int +grub_font_get_descent (grub_font_t font) +{ + return font->descent; +} + +/* FIXME: not correct for all fonts. */ +int +grub_font_get_xheight (grub_font_t font) +{ + return font->ascent / 2; +} + +/* Get the *standard leading* of the font in pixel, which is the spacing + between two lines of text. Specifically, it is the space between the + descent of one line and the ascent of the next line. This is included + in the *height* metric. */ +int +grub_font_get_leading (grub_font_t font) +{ + return font->leading; +} + +/* Get the distance in pixels between baselines of adjacent lines of text. */ +int +grub_font_get_height (grub_font_t font) +{ + return font->ascent + font->descent + font->leading; +} + +/* Get the glyph for FONT corresponding to the Unicode code point CODE. + Returns the ASCII glyph for the code if no other fonts are available. + The glyphs are cached once loaded. */ +struct grub_font_glyph * +grub_font_get_glyph (grub_font_t font, grub_uint32_t code) +{ + struct grub_font_glyph *glyph = 0; + if (font) + glyph = grub_font_get_glyph_internal (font, code); + if (glyph == 0) + { + glyph = ascii_glyph_lookup (code); + } + return glyph; +} + + +/* Calculate a subject value representing "how similar" two fonts are. + This is used to prioritize the order that fonts are scanned for missing + glyphs. The object is to select glyphs from the most similar font + possible, for the best appearance. + The heuristic is crude, but it helps greatly when fonts of similar + sizes are used so that tiny 8 point glyphs are not mixed into a string + of 24 point text unless there is no other choice. */ +static int +get_font_diversity (grub_font_t a, grub_font_t b) +{ + int d; + + d = 0; + + if (a->ascent && b->ascent) + d += grub_abs (a->ascent - b->ascent) * 8; + else + /* Penalty for missing attributes. */ + d += 50; + + if (a->max_char_height && b->max_char_height) + d += grub_abs (a->max_char_height - b->max_char_height) * 8; + else + /* Penalty for missing attributes. */ + d += 50; + + /* Weight is a minor factor. */ + d += (a->weight != b->weight) ? 5 : 0; + + return d; +} + +/* Get a glyph corresponding to the codepoint CODE. If FONT contains the + specified glyph, then it is returned. Otherwise, all other loaded fonts + are searched until one is found that contains a glyph for CODE. + If no glyph is available for CODE in the loaded fonts, then a glyph + representing an unknown character is returned. + This function never returns NULL. + The returned glyph is owned by the font manager and should not be freed + by the caller. The glyphs are cached. */ +struct grub_font_glyph * +grub_font_get_glyph_with_fallback (grub_font_t font, grub_uint32_t code) +{ + struct grub_font_glyph *glyph; + struct grub_font_node *node; + /* Keep track of next node, in case there's an I/O error in + grub_font_get_glyph_internal() and the font is removed from the list. */ + struct grub_font_node *next; + /* Information on the best glyph found so far, to help find the glyph in + the best matching to the requested one. */ + int best_diversity; + struct grub_font_glyph *best_glyph; + + if (font) + { + /* First try to get the glyph from the specified font. */ + glyph = grub_font_get_glyph_internal (font, code); + if (glyph) + return glyph; + } + + /* Otherwise, search all loaded fonts for the glyph and use the one from + the font that best matches the requested font. */ + best_diversity = 10000; + best_glyph = 0; + + for (node = grub_font_list; node; node = next) + { + grub_font_t curfont; + + curfont = node->value; + next = node->next; + + glyph = grub_font_get_glyph_internal (curfont, code); + if (glyph && !font) + return glyph; + if (glyph) + { + int d; + + d = get_font_diversity (curfont, font); + if (d < best_diversity) + { + best_diversity = d; + best_glyph = glyph; + } + } + } + + return best_glyph; +} + +#if 0 +static struct grub_font_glyph * +grub_font_dup_glyph (struct grub_font_glyph *glyph) +{ + static struct grub_font_glyph *ret; + ret = grub_malloc (sizeof (*ret) + (glyph->width * glyph->height + 7) / 8); + if (!ret) + return NULL; + grub_memcpy (ret, glyph, sizeof (*ret) + + (glyph->width * glyph->height + 7) / 8); + return ret; +} +#endif + +/* FIXME: suboptimal. */ +static void +grub_font_blit_glyph (struct grub_font_glyph *target, + struct grub_font_glyph *src, unsigned dx, unsigned dy) +{ + unsigned src_bit, tgt_bit, src_byte, tgt_byte; + unsigned i, j; + for (i = 0; i < src->height; i++) + { + src_bit = (src->width * i) % 8; + src_byte = (src->width * i) / 8; + tgt_bit = (target->width * (dy + i) + dx) % 8; + tgt_byte = (target->width * (dy + i) + dx) / 8; + for (j = 0; j < src->width; j++) + { + target->bitmap[tgt_byte] |= ((src->bitmap[src_byte] << src_bit) + & 0x80) >> tgt_bit; + src_bit++; + tgt_bit++; + if (src_bit == 8) + { + src_byte++; + src_bit = 0; + } + if (tgt_bit == 8) + { + tgt_byte++; + tgt_bit = 0; + } + } + } +} + +static void +grub_font_blit_glyph_mirror (struct grub_font_glyph *target, + struct grub_font_glyph *src, + unsigned dx, unsigned dy) +{ + unsigned tgt_bit, src_byte, tgt_byte; + signed src_bit; + unsigned i, j; + for (i = 0; i < src->height; i++) + { + src_bit = (src->width * i + src->width - 1) % 8; + src_byte = (src->width * i + src->width - 1) / 8; + tgt_bit = (target->width * (dy + i) + dx) % 8; + tgt_byte = (target->width * (dy + i) + dx) / 8; + for (j = 0; j < src->width; j++) + { + target->bitmap[tgt_byte] |= ((src->bitmap[src_byte] << src_bit) + & 0x80) >> tgt_bit; + src_bit--; + tgt_bit++; + if (src_bit == -1) + { + src_byte--; + src_bit = 7; + } + if (tgt_bit == 8) + { + tgt_byte++; + tgt_bit = 0; + } + } + } +} + +/* Context for blit_comb. */ +struct blit_comb_ctx +{ + struct grub_font_glyph *glyph; + int *device_width; + struct grub_video_signed_rect bounds; +}; + +/* Helper for blit_comb. */ +static void +do_blit (struct grub_font_glyph *src, signed dx, signed dy, + struct blit_comb_ctx *ctx) +{ + if (ctx->glyph) + grub_font_blit_glyph (ctx->glyph, src, dx - ctx->glyph->offset_x, + (ctx->glyph->height + ctx->glyph->offset_y) + dy); + if (dx < ctx->bounds.x) + { + ctx->bounds.width += ctx->bounds.x - dx; + ctx->bounds.x = dx; + } + if (ctx->bounds.y > -src->height - dy) + { + ctx->bounds.height += ctx->bounds.y - (-src->height - dy); + ctx->bounds.y = (-src->height - dy); + } + if (dx + src->width - ctx->bounds.x >= (signed) ctx->bounds.width) + ctx->bounds.width = dx + src->width - ctx->bounds.x + 1; + if ((signed) ctx->bounds.height < src->height + (-src->height - dy) + - ctx->bounds.y) + ctx->bounds.height = src->height + (-src->height - dy) - ctx->bounds.y; +} + +/* Helper for blit_comb. */ +static inline void +add_device_width (int val, struct blit_comb_ctx *ctx) +{ + if (ctx->glyph) + ctx->glyph->device_width += val; + if (ctx->device_width) + *ctx->device_width += val; +} + +static void +blit_comb (const struct grub_unicode_glyph *glyph_id, + struct grub_font_glyph *glyph, + struct grub_video_signed_rect *bounds_out, + struct grub_font_glyph *main_glyph, + struct grub_font_glyph **combining_glyphs, int *device_width) +{ + struct blit_comb_ctx ctx = { + .glyph = glyph, + .device_width = device_width + }; + unsigned i; + signed above_rightx, above_righty; + signed above_leftx, above_lefty; + signed below_rightx, below_righty; + signed min_devwidth = 0; + const struct grub_unicode_combining *comb; + + if (glyph) + glyph->device_width = main_glyph->device_width; + if (device_width) + *device_width = main_glyph->device_width; + + ctx.bounds.x = main_glyph->offset_x; + ctx.bounds.y = main_glyph->offset_y; + ctx.bounds.width = main_glyph->width; + ctx.bounds.height = main_glyph->height; + + above_rightx = main_glyph->offset_x + main_glyph->width; + above_righty = ctx.bounds.y + ctx.bounds.height; + + above_leftx = main_glyph->offset_x; + above_lefty = ctx.bounds.y + ctx.bounds.height; + + below_rightx = ctx.bounds.x + ctx.bounds.width; + below_righty = ctx.bounds.y; + + comb = grub_unicode_get_comb (glyph_id); + + for (i = 0; i < glyph_id->ncomb; i++) + { + grub_int16_t space = 0; + /* Center by default. */ + grub_int16_t targetx; + + if (!combining_glyphs[i]) + continue; + targetx = (ctx.bounds.width - combining_glyphs[i]->width) / 2 + ctx.bounds.x; + /* CGJ is to avoid diacritics reordering. */ + if (comb[i].code + == GRUB_UNICODE_COMBINING_GRAPHEME_JOINER) + continue; + switch (comb[i].type) + { + case GRUB_UNICODE_COMB_OVERLAY: + do_blit (combining_glyphs[i], + targetx, + (ctx.bounds.height - combining_glyphs[i]->height) / 2 + - (ctx.bounds.height + ctx.bounds.y), &ctx); + if (min_devwidth < combining_glyphs[i]->width) + min_devwidth = combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_ATTACHED_ABOVE_RIGHT: + do_blit (combining_glyphs[i], above_rightx, -above_righty, &ctx); + above_rightx += combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_ABOVE_RIGHT: + do_blit (combining_glyphs[i], above_rightx, + -(above_righty + combining_glyphs[i]->height), &ctx); + above_rightx += combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_ABOVE_LEFT: + above_leftx -= combining_glyphs[i]->width; + do_blit (combining_glyphs[i], above_leftx, + -(above_lefty + combining_glyphs[i]->height), &ctx); + break; + + case GRUB_UNICODE_COMB_BELOW_RIGHT: + do_blit (combining_glyphs[i], below_rightx, below_righty, &ctx); + below_rightx += combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_HEBREW_HOLAM: + if (glyph_id->base != GRUB_UNICODE_HEBREW_WAW) + targetx = + main_glyph->offset_x - combining_glyphs[i]->width - + (combining_glyphs[i]->width + 3) / 4; + goto above_on_main; + + case GRUB_UNICODE_COMB_HEBREW_SIN_DOT: + targetx = main_glyph->offset_x + combining_glyphs[i]->width / 4; + goto above_on_main; + + case GRUB_UNICODE_COMB_HEBREW_SHIN_DOT: + targetx = + main_glyph->width + main_glyph->offset_x - + combining_glyphs[i]->width; + above_on_main: + space = combining_glyphs[i]->offset_y + - grub_font_get_xheight (combining_glyphs[i]->font) - 1; + if (space <= 0) + space = 1 + (grub_font_get_xheight (main_glyph->font)) / 8; + do_blit (combining_glyphs[i], targetx, + -(main_glyph->height + main_glyph->offset_y + space + + combining_glyphs[i]->height), &ctx); + if (min_devwidth < combining_glyphs[i]->width) + min_devwidth = combining_glyphs[i]->width; + break; + + /* TODO: Put dammah, fathah and alif nearer to shadda. */ + case GRUB_UNICODE_COMB_SYRIAC_SUPERSCRIPT_ALAPH: + case GRUB_UNICODE_COMB_ARABIC_DAMMAH: + case GRUB_UNICODE_COMB_ARABIC_DAMMATAN: + case GRUB_UNICODE_COMB_ARABIC_FATHATAN: + case GRUB_UNICODE_COMB_ARABIC_FATHAH: + case GRUB_UNICODE_COMB_ARABIC_SUPERSCRIPT_ALIF: + case GRUB_UNICODE_COMB_ARABIC_SUKUN: + case GRUB_UNICODE_COMB_ARABIC_SHADDA: + case GRUB_UNICODE_COMB_HEBREW_RAFE: + case GRUB_UNICODE_STACK_ABOVE: + stacked_above: + space = combining_glyphs[i]->offset_y + - grub_font_get_xheight (combining_glyphs[i]->font) - 1; + if (space <= 0) + space = 1 + (grub_font_get_xheight (main_glyph->font)) / 8; + /* Fallthrough. */ + case GRUB_UNICODE_STACK_ATTACHED_ABOVE: + do_blit (combining_glyphs[i], targetx, + -(ctx.bounds.height + ctx.bounds.y + space + + combining_glyphs[i]->height), &ctx); + if (min_devwidth < combining_glyphs[i]->width) + min_devwidth = combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_HEBREW_DAGESH: + do_blit (combining_glyphs[i], targetx, + -(ctx.bounds.height / 2 + ctx.bounds.y + + combining_glyphs[i]->height / 2), &ctx); + if (min_devwidth < combining_glyphs[i]->width) + min_devwidth = combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_HEBREW_SHEVA: + case GRUB_UNICODE_COMB_HEBREW_HIRIQ: + case GRUB_UNICODE_COMB_HEBREW_QAMATS: + case GRUB_UNICODE_COMB_HEBREW_TSERE: + case GRUB_UNICODE_COMB_HEBREW_SEGOL: + /* TODO: placement in final kaf and under reish. */ + + case GRUB_UNICODE_COMB_HEBREW_HATAF_SEGOL: + case GRUB_UNICODE_COMB_HEBREW_HATAF_PATAH: + case GRUB_UNICODE_COMB_HEBREW_HATAF_QAMATS: + case GRUB_UNICODE_COMB_HEBREW_PATAH: + case GRUB_UNICODE_COMB_HEBREW_QUBUTS: + case GRUB_UNICODE_COMB_HEBREW_METEG: + /* TODO: Put kasra and kasratan under shadda. */ + case GRUB_UNICODE_COMB_ARABIC_KASRA: + case GRUB_UNICODE_COMB_ARABIC_KASRATAN: + /* I don't know how ypogegrammeni differs from subscript. */ + case GRUB_UNICODE_COMB_YPOGEGRAMMENI: + case GRUB_UNICODE_STACK_BELOW: + stacked_below: + space = -(combining_glyphs[i]->offset_y + + combining_glyphs[i]->height); + if (space <= 0) + space = 1 + (grub_font_get_xheight (main_glyph->font)) / 8; + /* Fallthrough. */ + + case GRUB_UNICODE_STACK_ATTACHED_BELOW: + do_blit (combining_glyphs[i], targetx, -(ctx.bounds.y - space), + &ctx); + if (min_devwidth < combining_glyphs[i]->width) + min_devwidth = combining_glyphs[i]->width; + break; + + case GRUB_UNICODE_COMB_MN: + switch (comb[i].code) + { + case GRUB_UNICODE_THAANA_ABAFILI: + case GRUB_UNICODE_THAANA_AABAAFILI: + case GRUB_UNICODE_THAANA_UBUFILI: + case GRUB_UNICODE_THAANA_OOBOOFILI: + case GRUB_UNICODE_THAANA_EBEFILI: + case GRUB_UNICODE_THAANA_EYBEYFILI: + case GRUB_UNICODE_THAANA_OBOFILI: + case GRUB_UNICODE_THAANA_OABOAFILI: + case GRUB_UNICODE_THAANA_SUKUN: + goto stacked_above; + case GRUB_UNICODE_THAANA_IBIFILI: + case GRUB_UNICODE_THAANA_EEBEEFILI: + goto stacked_below; + } + /* Fall through. */ + default: + { + /* Default handling. Just draw combining character on top + of base character. + FIXME: support more unicode types correctly. + */ + do_blit (combining_glyphs[i], + main_glyph->device_width + + combining_glyphs[i]->offset_x, + -(combining_glyphs[i]->height + + combining_glyphs[i]->offset_y), &ctx); + add_device_width (combining_glyphs[i]->device_width, &ctx); + } + } + } + add_device_width ((above_rightx > + below_rightx ? above_rightx : below_rightx) - + (main_glyph->offset_x + main_glyph->width), &ctx); + add_device_width (above_leftx - main_glyph->offset_x, &ctx); + if (glyph && glyph->device_width < min_devwidth) + glyph->device_width = min_devwidth; + if (device_width && *device_width < min_devwidth) + *device_width = min_devwidth; + + if (bounds_out) + *bounds_out = ctx.bounds; +} + +static struct grub_font_glyph * +grub_font_construct_dry_run (grub_font_t hinted_font, + const struct grub_unicode_glyph *glyph_id, + struct grub_video_signed_rect *bounds, + struct grub_font_glyph **combining_glyphs, + int *device_width) +{ + struct grub_font_glyph *main_glyph = NULL; + grub_uint32_t desired_attributes = 0; + unsigned i; + grub_uint32_t base = glyph_id->base; + const struct grub_unicode_combining *comb; + + if (glyph_id->attributes & GRUB_UNICODE_GLYPH_ATTRIBUTE_RIGHT_JOINED) + desired_attributes |= GRUB_FONT_CODE_RIGHT_JOINED; + + if (glyph_id->attributes & GRUB_UNICODE_GLYPH_ATTRIBUTE_LEFT_JOINED) + desired_attributes |= GRUB_FONT_CODE_LEFT_JOINED; + + comb = grub_unicode_get_comb (glyph_id); + + if (base == 'i' || base == 'j') + { + for (i = 0; i < glyph_id->ncomb; i++) + if (comb[i].type == GRUB_UNICODE_STACK_ABOVE) + break; + if (i < glyph_id->ncomb && base == 'i') + base = GRUB_UNICODE_DOTLESS_LOWERCASE_I; + if (i < glyph_id->ncomb && base == 'j') + base = GRUB_UNICODE_DOTLESS_LOWERCASE_J; + } + + main_glyph = grub_font_get_glyph_with_fallback (hinted_font, base + | desired_attributes); + + if (!main_glyph) + main_glyph = grub_font_get_glyph_with_fallback (hinted_font, + base); + + /* Glyph not available in any font. Use ASCII fallback. */ + if (!main_glyph) + main_glyph = ascii_glyph_lookup (base); + + /* Glyph not available in any font. Return unknown glyph. */ + if (!main_glyph) + return NULL; + + if (device_width) + *device_width = main_glyph->device_width; + + if (!glyph_id->ncomb && !glyph_id->attributes) + return main_glyph; + + if (glyph_id->ncomb && !combining_glyphs) + { + grub_errno = GRUB_ERR_NONE; + return main_glyph; + } + + for (i = 0; i < glyph_id->ncomb; i++) + combining_glyphs[i] + = grub_font_get_glyph_with_fallback (main_glyph->font, + comb[i].code); + + blit_comb (glyph_id, NULL, bounds, main_glyph, combining_glyphs, + device_width); + + return main_glyph; +} + +static struct grub_font_glyph **render_combining_glyphs = 0; +static grub_size_t render_max_comb_glyphs = 0; + +static void +ensure_comb_space (const struct grub_unicode_glyph *glyph_id) +{ + if (glyph_id->ncomb <= render_max_comb_glyphs) + return; + + render_max_comb_glyphs = 2 * glyph_id->ncomb; + if (render_max_comb_glyphs < 8) + render_max_comb_glyphs = 8; + grub_free (render_combining_glyphs); + render_combining_glyphs = grub_malloc (render_max_comb_glyphs + * sizeof (render_combining_glyphs[0])); + if (!render_combining_glyphs) + grub_errno = 0; +} + +int +grub_font_get_constructed_device_width (grub_font_t hinted_font, + const struct grub_unicode_glyph + *glyph_id) +{ + int ret; + struct grub_font_glyph *main_glyph; + + ensure_comb_space (glyph_id); + + main_glyph = grub_font_construct_dry_run (hinted_font, glyph_id, NULL, + render_combining_glyphs, &ret); + if (!main_glyph) + return unknown_glyph->device_width; + return ret; +} + +struct grub_font_glyph * +grub_font_construct_glyph (grub_font_t hinted_font, + const struct grub_unicode_glyph *glyph_id) +{ + struct grub_font_glyph *main_glyph; + struct grub_video_signed_rect bounds; + static struct grub_font_glyph *glyph = 0; + static grub_size_t max_glyph_size = 0; + + ensure_comb_space (glyph_id); + + main_glyph = grub_font_construct_dry_run (hinted_font, glyph_id, + &bounds, render_combining_glyphs, + NULL); + + if (!main_glyph) + return unknown_glyph; + + if (!render_combining_glyphs && glyph_id->ncomb) + return main_glyph; + + if (!glyph_id->ncomb && !glyph_id->attributes) + return main_glyph; + + if (max_glyph_size < sizeof (*glyph) + (bounds.width * bounds.height + GRUB_CHAR_BIT - 1) / GRUB_CHAR_BIT) + { + grub_free (glyph); + max_glyph_size = (sizeof (*glyph) + (bounds.width * bounds.height + GRUB_CHAR_BIT - 1) / GRUB_CHAR_BIT) * 2; + if (max_glyph_size < 8) + max_glyph_size = 8; + glyph = grub_malloc (max_glyph_size); + } + if (!glyph) + { + grub_errno = GRUB_ERR_NONE; + return main_glyph; + } + + grub_memset (glyph, 0, sizeof (*glyph) + + (bounds.width * bounds.height + + GRUB_CHAR_BIT - 1) / GRUB_CHAR_BIT); + + glyph->font = main_glyph->font; + glyph->width = bounds.width; + glyph->height = bounds.height; + glyph->offset_x = bounds.x; + glyph->offset_y = bounds.y; + + if (glyph_id->attributes & GRUB_UNICODE_GLYPH_ATTRIBUTE_MIRROR) + grub_font_blit_glyph_mirror (glyph, main_glyph, + main_glyph->offset_x - glyph->offset_x, + (glyph->height + glyph->offset_y) + - (main_glyph->height + + main_glyph->offset_y)); + else + grub_font_blit_glyph (glyph, main_glyph, + main_glyph->offset_x - glyph->offset_x, + (glyph->height + glyph->offset_y) + - (main_glyph->height + main_glyph->offset_y)); + + blit_comb (glyph_id, glyph, NULL, main_glyph, render_combining_glyphs, NULL); + + return glyph; +} + +/* Draw the specified glyph at (x, y). The y coordinate designates the + baseline of the character, while the x coordinate designates the left + side location of the character. */ +grub_err_t +grub_font_draw_glyph (struct grub_font_glyph * glyph, + grub_video_color_t color, int left_x, int baseline_y) +{ + struct grub_video_bitmap glyph_bitmap; + + /* Don't try to draw empty glyphs (U+0020, etc.). */ + if (glyph->width == 0 || glyph->height == 0) + return GRUB_ERR_NONE; + + glyph_bitmap.mode_info.width = glyph->width; + glyph_bitmap.mode_info.height = glyph->height; + glyph_bitmap.mode_info.mode_type + = (1 << GRUB_VIDEO_MODE_TYPE_DEPTH_POS) | GRUB_VIDEO_MODE_TYPE_1BIT_BITMAP; + glyph_bitmap.mode_info.blit_format = GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED; + glyph_bitmap.mode_info.bpp = 1; + + /* Really 1 bit per pixel. */ + glyph_bitmap.mode_info.bytes_per_pixel = 0; + + /* Packed densely as bits. */ + glyph_bitmap.mode_info.pitch = glyph->width; + + glyph_bitmap.mode_info.number_of_colors = 2; + glyph_bitmap.mode_info.bg_red = 0; + glyph_bitmap.mode_info.bg_green = 0; + glyph_bitmap.mode_info.bg_blue = 0; + glyph_bitmap.mode_info.bg_alpha = 0; + grub_video_unmap_color (color, + &glyph_bitmap.mode_info.fg_red, + &glyph_bitmap.mode_info.fg_green, + &glyph_bitmap.mode_info.fg_blue, + &glyph_bitmap.mode_info.fg_alpha); + glyph_bitmap.data = glyph->bitmap; + + int bitmap_left = left_x + glyph->offset_x; + int bitmap_bottom = baseline_y - glyph->offset_y; + int bitmap_top = bitmap_bottom - glyph->height; + + return grub_video_blit_bitmap (&glyph_bitmap, GRUB_VIDEO_BLIT_BLEND, + bitmap_left, bitmap_top, + 0, 0, glyph->width, glyph->height); +} |