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-rw-r--r--app/text/gimptext-xlfd.c301
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diff --git a/app/text/gimptext-xlfd.c b/app/text/gimptext-xlfd.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * GimpText
+ * Copyright (C) 2002-2004 Sven Neumann <sven@gimp.org>
+ *
+ * Some of this code was copied from Pango (pangox-fontmap.c)
+ * and was originally written by Owen Taylor <otaylor@redhat.com>.
+ *
+ * This program 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.
+ *
+ * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <gio/gio.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "text-types.h"
+
+#include "gimptext.h"
+#include "gimptext-xlfd.h"
+
+
+#define XLFD_MAX_FIELD_LEN 64
+
+/* These are the field numbers in the X Logical Font Description fontnames,
+ e.g. -adobe-courier-bold-o-normal--25-180-100-100-m-150-iso8859-1 */
+enum
+{
+ XLFD_FOUNDRY = 0,
+ XLFD_FAMILY = 1,
+ XLFD_WEIGHT = 2,
+ XLFD_SLANT = 3,
+ XLFD_SET_WIDTH = 4,
+ XLFD_ADD_STYLE = 5,
+ XLFD_PIXELS = 6,
+ XLFD_POINTS = 7,
+ XLFD_RESOLUTION_X = 8,
+ XLFD_RESOLUTION_Y = 9,
+ XLFD_SPACING = 10,
+ XLFD_AVERAGE_WIDTH = 11,
+ XLFD_CHARSET = 12,
+ XLFD_NUM_FIELDS
+};
+
+static gchar * gimp_text_get_xlfd_field (const gchar *fontname,
+ gint field_num,
+ gchar *buffer);
+static gchar * launder_font_name (gchar *name);
+
+
+/**
+ * gimp_text_font_name_from_xlfd:
+ * @xlfd: X Logical Font Description
+ *
+ * Attempts to extract a meaningful font name from the "family",
+ * "weight", "slant" and "stretch" fields of an X Logical Font
+ * Description.
+ *
+ * Return value: a newly allocated string.
+ **/
+gchar *
+gimp_text_font_name_from_xlfd (const gchar *xlfd)
+{
+ gchar *fields[4];
+ gchar buffers[4][XLFD_MAX_FIELD_LEN];
+ gint i = 0;
+
+ /* family */
+ fields[i] = gimp_text_get_xlfd_field (xlfd, XLFD_FAMILY, buffers[i]);
+ if (fields[i])
+ i++;
+
+ /* weight */
+ fields[i] = gimp_text_get_xlfd_field (xlfd, XLFD_WEIGHT, buffers[i]);
+ if (fields[i] && strcmp (fields[i], "medium"))
+ i++;
+
+ /* slant */
+ fields[i] = gimp_text_get_xlfd_field (xlfd, XLFD_SLANT, buffers[i]);
+ if (fields[i])
+ {
+ switch (*fields[i])
+ {
+ case 'i':
+ strcpy (buffers[i], "italic");
+ i++;
+ break;
+ case 'o':
+ strcpy (buffers[i], "oblique");
+ i++;
+ break;
+ case 'r':
+ break;
+ }
+ }
+
+ /* stretch */
+ fields[i] = gimp_text_get_xlfd_field (xlfd, XLFD_SET_WIDTH, buffers[i]);
+ if (fields[i] && strcmp (fields[i], "normal"))
+ i++;
+
+ if (i < 4)
+ fields[i] = NULL;
+
+ return launder_font_name (g_strconcat (fields[0], " ",
+ fields[1], " ",
+ fields[2], " ",
+ fields[3], NULL));
+}
+
+/**
+ * gimp_text_font_size_from_xlfd:
+ * @xlfd: X Logical Font Description
+ * @size: return location for the font size
+ * @size_unit: return location for the font size unit
+ *
+ * Attempts to extract the font size from an X Logical Font
+ * Description.
+ *
+ * Return value: %TRUE on success, %FALSE otherwise.
+ **/
+gboolean
+gimp_text_font_size_from_xlfd (const gchar *xlfd,
+ gdouble *size,
+ GimpUnit *size_unit)
+{
+ gchar buffer[XLFD_MAX_FIELD_LEN];
+ gchar *field;
+
+ if (!xlfd)
+ return FALSE;
+
+ field = gimp_text_get_xlfd_field (xlfd, XLFD_PIXELS, buffer);
+ if (field)
+ {
+ *size = atoi (field);
+ *size_unit = GIMP_UNIT_PIXEL;
+ return TRUE;
+ }
+
+ field = gimp_text_get_xlfd_field (xlfd, XLFD_POINTS, buffer);
+ if (field)
+ {
+ *size = atoi (field) / 10.0;
+ *size_unit = GIMP_UNIT_POINT;
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/**
+ * gimp_text_set_font_from_xlfd:
+ * @text: a #GimpText object
+ * @xlfd: X Logical Font Description
+ *
+ * Attempts to extract font name and font size from @xlfd and sets
+ * them on the #GimpText object.
+ **/
+void
+gimp_text_set_font_from_xlfd (GimpText *text,
+ const gchar *xlfd)
+{
+ gchar *font;
+ gdouble size;
+ GimpUnit size_unit;
+
+ g_return_if_fail (GIMP_IS_TEXT (text));
+
+ if (!xlfd)
+ return;
+
+ font = gimp_text_font_name_from_xlfd (xlfd);
+
+#if GIMP_TEXT_DEBUG
+ g_printerr ("XLFD: %s font: %s\n", xlfd, font ? font : "(null)");
+#endif
+
+ if (gimp_text_font_size_from_xlfd (xlfd, &size, &size_unit))
+ {
+ g_object_set (text,
+ "font-size", size,
+ "font-size-unit", size_unit,
+ font ? "font" : NULL, font,
+ NULL);
+ }
+ else if (font)
+ {
+ g_object_set (text,
+ "font", font,
+ NULL);
+ }
+
+ g_free (font);
+}
+
+/**
+ * gimp_text_get_xlfd_field:
+ * @fontname: an XLFD fontname
+ * @field_num: field index
+ * @buffer: buffer of at least XLFD_MAX_FIELD_LEN chars
+ *
+ * Fills the buffer with the specified field from the X Logical Font
+ * Description name, and returns it. Note: For the charset field, we
+ * also return the encoding, e.g. 'iso8859-1'.
+ *
+ * This function is basically copied from pangox-fontmap.c.
+ *
+ * Returns: a pointer to the filled buffer or %NULL if fontname is
+ * %NULL, the field is longer than XFLD_MAX_FIELD_LEN or it contains
+ * just an asterisk.
+ **/
+static gchar *
+gimp_text_get_xlfd_field (const gchar *fontname,
+ gint field_num,
+ gchar *buffer)
+{
+ const gchar *t1, *t2;
+ gchar *p;
+ gint countdown, num_dashes;
+ gsize len;
+
+ if (!fontname)
+ return NULL;
+
+ /* we assume this is a valid fontname...that is, it has 14 fields */
+
+ for (t1 = fontname, countdown = field_num; *t1 && (countdown >= 0); t1++)
+ if (*t1 == '-')
+ countdown--;
+
+ num_dashes = (field_num == XLFD_CHARSET) ? 2 : 1;
+
+ for (t2 = t1; *t2; t2++)
+ {
+ if (*t2 == '-' && --num_dashes == 0)
+ break;
+ }
+
+ if (t2 > t1)
+ {
+ /* Check we don't overflow the buffer */
+ len = (gsize) t2 - (gsize) t1;
+ if (len > XLFD_MAX_FIELD_LEN - 1)
+ return NULL;
+
+ if (*t1 == '*')
+ return NULL;
+
+ strncpy (buffer, t1, len);
+ buffer[len] = 0;
+
+ /* Convert to lower case. */
+ for (p = buffer; *p; p++)
+ *p = g_ascii_tolower (*p);
+ }
+ else
+ {
+ return NULL;
+ }
+
+ return buffer;
+}
+
+/* Guard against font names that end in numbers being interpreted as a
+ * font size in pango font descriptions
+ */
+static gchar *
+launder_font_name (gchar *name)
+{
+ gchar *laundered_name;
+ gchar last_char;
+
+ last_char = name[strlen (name) - 1];
+
+ if (g_ascii_isdigit (last_char) || last_char == '.')
+ {
+ laundered_name = g_strconcat (name, ",", NULL);
+ g_free (name);
+
+ return laundered_name;
+ }
+ else
+ return name;
+}
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