forked from AuroraMiddleware/gtk
351 lines
9.1 KiB
C
351 lines
9.1 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "gdkdisplay.h"
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#include "gdkfont.h"
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#include "gdkinternals.h"
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GType
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gdk_font_get_type (void)
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{
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static GType our_type = 0;
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if (our_type == 0)
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our_type = g_boxed_type_register_static ("GdkFont",
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(GBoxedCopyFunc)gdk_font_ref,
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(GBoxedFreeFunc)gdk_font_unref);
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return our_type;
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}
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/**
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* gdk_font_ref:
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* @font: a #GdkFont
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*
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* Increases the reference count of a font by one.
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*
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* Return value: @font
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**/
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GdkFont*
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gdk_font_ref (GdkFont *font)
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{
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GdkFontPrivate *private;
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g_return_val_if_fail (font != NULL, NULL);
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private = (GdkFontPrivate*) font;
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private->ref_count += 1;
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return font;
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}
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/**
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* gdk_font_unref:
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* @font: a #GdkFont
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*
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* Decreases the reference count of a font by one.
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* If the result is zero, destroys the font.
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**/
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void
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gdk_font_unref (GdkFont *font)
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{
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GdkFontPrivate *private;
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private = (GdkFontPrivate*) font;
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g_return_if_fail (font != NULL);
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g_return_if_fail (private->ref_count > 0);
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private->ref_count -= 1;
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if (private->ref_count == 0)
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_gdk_font_destroy (font);
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}
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/**
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* gdk_string_width:
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* @font: a #GdkFont
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* @string: the nul-terminated string to measure
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*
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* Determines the width of a nul-terminated string.
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* (The distance from the origin of the string to the
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* point where the next string in a sequence of strings
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* should be drawn)
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*
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* Return value: the width of the string in pixels.
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**/
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gint
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gdk_string_width (GdkFont *font,
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const gchar *string)
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{
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g_return_val_if_fail (font != NULL, -1);
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g_return_val_if_fail (string != NULL, -1);
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return gdk_text_width (font, string, _gdk_font_strlen (font, string));
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}
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/**
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* gdk_char_width:
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* @font: a #GdkFont
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* @character: the character to measure.
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*
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* Determines the width of a given character.
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*
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* Return value: the width of the character in pixels.
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**/
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gint
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gdk_char_width (GdkFont *font,
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gchar character)
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{
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g_return_val_if_fail (font != NULL, -1);
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return gdk_text_width (font, &character, 1);
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}
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/**
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* gdk_char_width_wc:
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* @font: a #GdkFont
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* @character: the character to measure.
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*
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* Determines the width of a given wide character. (Encoded
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* in the wide-character encoding of the current locale).
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*
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* Return value: the width of the character in pixels.
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**/
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gint
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gdk_char_width_wc (GdkFont *font,
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GdkWChar character)
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{
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g_return_val_if_fail (font != NULL, -1);
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return gdk_text_width_wc (font, &character, 1);
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}
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/**
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* gdk_string_measure:
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* @font: a #GdkFont
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* @string: the nul-terminated string to measure.
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*
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* Determines the distance from the origin to the rightmost
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* portion of a nul-terminated string when drawn. This is not the
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* correct value for determining the origin of the next
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* portion when drawing text in multiple pieces.
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* See gdk_string_width().
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*
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* Return value: the right bearing of the string in pixels.
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**/
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gint
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gdk_string_measure (GdkFont *font,
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const gchar *string)
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{
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g_return_val_if_fail (font != NULL, -1);
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g_return_val_if_fail (string != NULL, -1);
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return gdk_text_measure (font, string, _gdk_font_strlen (font, string));
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}
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/**
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* gdk_string_extents:
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* @font: a #GdkFont.
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* @string: the nul-terminated string to measure.
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* @lbearing: the left bearing of the string.
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* @rbearing: the right bearing of the string.
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* @width: the width of the string.
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* @ascent: the ascent of the string.
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* @descent: the descent of the string.
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*
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* Returns the metrics of a nul-terminated string.
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**/
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void
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gdk_string_extents (GdkFont *font,
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const gchar *string,
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gint *lbearing,
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gint *rbearing,
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gint *width,
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gint *ascent,
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gint *descent)
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{
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g_return_if_fail (font != NULL);
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g_return_if_fail (string != NULL);
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gdk_text_extents (font, string, _gdk_font_strlen (font, string),
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lbearing, rbearing, width, ascent, descent);
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}
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/**
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* gdk_text_measure:
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* @font: a #GdkFont
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* @text: the text to measure.
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* @text_length: the length of the text in bytes.
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*
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* Determines the distance from the origin to the rightmost
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* portion of a string when drawn. This is not the
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* correct value for determining the origin of the next
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* portion when drawing text in multiple pieces.
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* See gdk_text_width().
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*
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* Return value: the right bearing of the string in pixels.
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**/
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gint
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gdk_text_measure (GdkFont *font,
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const gchar *text,
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gint text_length)
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{
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gint rbearing;
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g_return_val_if_fail (font != NULL, -1);
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g_return_val_if_fail (text != NULL, -1);
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gdk_text_extents (font, text, text_length, NULL, &rbearing, NULL, NULL, NULL);
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return rbearing;
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}
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/**
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* gdk_char_measure:
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* @font: a #GdkFont
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* @character: the character to measure.
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*
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* Determines the distance from the origin to the rightmost
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* portion of a character when drawn. This is not the
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* correct value for determining the origin of the next
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* portion when drawing text in multiple pieces.
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*
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* Return value: the right bearing of the character in pixels.
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**/
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gint
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gdk_char_measure (GdkFont *font,
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gchar character)
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{
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g_return_val_if_fail (font != NULL, -1);
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return gdk_text_measure (font, &character, 1);
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}
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/**
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* gdk_string_height:
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* @font: a #GdkFont
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* @string: the nul-terminated string to measure.
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*
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* Determines the total height of a given nul-terminated
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* string. This value is not generally useful, because you
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* cannot determine how this total height will be drawn in
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* relation to the baseline. See gdk_string_extents().
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*
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* Return value: the height of the string in pixels.
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**/
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gint
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gdk_string_height (GdkFont *font,
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const gchar *string)
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{
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g_return_val_if_fail (font != NULL, -1);
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g_return_val_if_fail (string != NULL, -1);
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return gdk_text_height (font, string, _gdk_font_strlen (font, string));
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}
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/**
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* gdk_text_height:
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* @font: a #GdkFont
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* @text: the text to measure.
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* @text_length: the length of the text in bytes.
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*
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* Determines the total height of a given string.
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* This value is not generally useful, because you cannot
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* determine how this total height will be drawn in
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* relation to the baseline. See gdk_text_extents().
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*
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* Return value: the height of the string in pixels.
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**/
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gint
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gdk_text_height (GdkFont *font,
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const gchar *text,
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gint text_length)
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{
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gint ascent, descent;
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g_return_val_if_fail (font != NULL, -1);
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g_return_val_if_fail (text != NULL, -1);
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gdk_text_extents (font, text, text_length, NULL, NULL, NULL, &ascent, &descent);
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return ascent + descent;
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}
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/**
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* gdk_char_height:
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* @font: a #GdkFont
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* @character: the character to measure.
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*
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* Determines the total height of a given character.
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* This value is not generally useful, because you cannot
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* determine how this total height will be drawn in
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* relation to the baseline. See gdk_text_extents().
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*
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* Return value: the height of the character in pixels.
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**/
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gint
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gdk_char_height (GdkFont *font,
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gchar character)
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{
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g_return_val_if_fail (font != NULL, -1);
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return gdk_text_height (font, &character, 1);
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}
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/**
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* gdk_font_from_description:
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* @font_desc: a #PangoFontDescription.
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*
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* Load a #GdkFont based on a Pango font description. This font will
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* only be an approximation of the Pango font, and
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* internationalization will not be handled correctly. This function
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* should only be used for legacy code that cannot be easily converted
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* to use Pango. Using Pango directly will produce better results.
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*
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* Return value: the newly loaded font, or %NULL if the font
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* cannot be loaded.
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**/
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GdkFont*
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gdk_font_from_description (PangoFontDescription *font_desc)
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{
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return gdk_font_from_description_for_display (gdk_display_get_default (),font_desc);
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}
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/**
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* gdk_font_load:
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* @font_name: a XLFD describing the font to load.
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*
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* Loads a font.
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*
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* The font may be newly loaded or looked up the font in a cache.
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* You should make no assumptions about the initial reference count.
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*
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* Return value: a #GdkFont, or %NULL if the font could not be loaded.
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**/
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GdkFont*
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gdk_font_load (const gchar *font_name)
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{
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return gdk_font_load_for_display (gdk_display_get_default(), font_name);
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}
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