--- /dev/null
+/* 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>
+
+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_malloc (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_ssize_t ret;
+
+ str = grub_malloc (section->length + 1);
+ 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 if (grub_strncmp(filename, "mem:", 4) == 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)
+ {
+ 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);
+}
projects / Ventoy.git / commitdiff