pangoxft-font.c

GTK+-2.0源码之pango-1.15.6.tar.gz

  if (ink_rect)
    *ink_rect = extents->ink_rect;

  if (logical_rect)
    *logical_rect = extents->logical_rect;
}

static void
pango_xft_font_get_glyph_extents (PangoFont        *font,
				  PangoGlyph        glyph,
				  PangoRectangle   *ink_rect,
				  PangoRectangle   *logical_rect)
{
  PangoXftFont *xfont = (PangoXftFont *)font;
  PangoFcFont *fcfont = PANGO_FC_FONT (font);

  if (!fcfont->fontmap)		/* Display closed */
    goto fallback;

  if (glyph == PANGO_GLYPH_EMPTY)
    {
    fallback:
      if (ink_rect)
	ink_rect->x = ink_rect->width = ink_rect->y = ink_rect->height = 0;
      if (logical_rect)
	logical_rect->x = logical_rect->width = logical_rect->y = logical_rect->height = 0;
      return;
    }
  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
    {
      get_glyph_extents_missing (xfont, glyph, ink_rect, logical_rect);
    }
  else
    {
      if (!fcfont->is_transformed)
	get_glyph_extents_xft (fcfont, glyph, ink_rect, logical_rect);
      else
	get_glyph_extents_raw (xfont, glyph, ink_rect, logical_rect);
    }
}

static void
load_fallback_font (PangoXftFont *xfont)
{
  PangoFcFont *fcfont = PANGO_FC_FONT (xfont);
  Display *display;
  int screen;
  XftFont *xft_font;
  gboolean size_is_absolute;
  double size;

  _pango_xft_font_map_get_info (fcfont->fontmap, &display, &screen);

  size_is_absolute = pango_font_description_get_size_is_absolute (fcfont->description);
  size = pango_font_description_get_size (fcfont->description) / PANGO_SCALE;

  xft_font = XftFontOpen (display,  screen,
			  FC_FAMILY, FcTypeString, "sans",
			  size_is_absolute ? FC_PIXEL_SIZE : FC_SIZE, FcTypeDouble, size,
			  NULL);

  if (!xft_font)
    {
      g_warning ("Cannot open fallback font, nothing to do");
      exit (1);
    }

  xfont->xft_font = xft_font;
}

static XftFont *
xft_font_get_font (PangoFont *font)
{
  PangoXftFont *xfont;
  PangoFcFont *fcfont;
  Display *display;
  int screen;

  xfont = (PangoXftFont *)font;
  fcfont = (PangoFcFont *)font;

  if (G_UNLIKELY (xfont->xft_font == NULL))
    {
      FcPattern *pattern = FcPatternDuplicate (fcfont->font_pattern);
      FcPatternDel (pattern, FC_SPACING);

      _pango_xft_font_map_get_info (fcfont->fontmap, &display, &screen);

      xfont->xft_font = XftFontOpenPattern (display, pattern);
      if (!xfont->xft_font)
	{
	  gchar *name = pango_font_description_to_string (fcfont->description);
	  g_warning ("Cannot open font file for font %s", name);
	  g_free (name);

	  load_fallback_font (xfont);
	}
    }

  return xfont->xft_font;
}

static FT_Face
pango_xft_font_real_lock_face (PangoFcFont *font)
{
  XftFont *xft_font = xft_font_get_font ((PangoFont *)font);

  return XftLockFace (xft_font);
}

static void
pango_xft_font_real_unlock_face (PangoFcFont *font)
{
  XftFont *xft_font = xft_font_get_font ((PangoFont *)font);

  XftUnlockFace (xft_font);
}

static gboolean
pango_xft_font_real_has_char (PangoFcFont *font,
			      gunichar     wc)
{
  XftFont *xft_font = xft_font_get_font ((PangoFont *)font);

  return XftCharExists (NULL, xft_font, wc);
}

static guint
pango_xft_font_real_get_glyph (PangoFcFont *font,
			       gunichar     wc)
{
  XftFont *xft_font = xft_font_get_font ((PangoFont *)font);

  return XftCharIndex (NULL, xft_font, wc);
}

static void
pango_xft_font_real_shutdown (PangoFcFont *fcfont)
{
  PangoXftFont *xfont = PANGO_XFT_FONT (fcfont);

  if (xfont->xft_font)
    {
      Display *display;

      _pango_xft_font_map_get_info (fcfont->fontmap, &display, NULL);
      XftFontClose (display, xfont->xft_font);
      xfont->xft_font = NULL;
    }
}

/**
 * pango_xft_font_get_font:
 * @font: a #PangoFont.
 *
 * Returns the XftFont of a font.
 *
 * Return value: the XftFont associated to @font.
 **/
XftFont *
pango_xft_font_get_font (PangoFont *font)
{
  if (G_UNLIKELY (!PANGO_XFT_IS_FONT (font)))
    {
      if (!_pango_xft_warning_history.get_font)
	{
	  _pango_xft_warning_history.get_font = TRUE;
	  g_warning ("pango_xft_font_get_font called with bad font, expect ugly output");
	}
      return NULL;
    }

  return xft_font_get_font (font);
}

/**
 * pango_xft_font_get_display:
 * @font: a #PangoFont.
 *
 * Returns the X display of the XftFont of a font.
 *
 * Return value: the X display of the XftFont associated to @font.
 **/
Display *
pango_xft_font_get_display (PangoFont *font)
{
  PangoFcFont *fcfont;
  Display *display;

  g_return_val_if_fail (PANGO_XFT_IS_FONT (font), NULL);

  fcfont = PANGO_FC_FONT (font);
  _pango_xft_font_map_get_info (fcfont->fontmap, &display, NULL);

  return display;
}

/**
 * pango_xft_font_get_unknown_glyph:
 * @font: a #PangoFont.
 * @wc: the Unicode character for which a glyph is needed.
 *
 * Returns the index of a glyph suitable for drawing @wc as an
 * unknown character.
 *
 * Use PANGO_GET_UNKNOWN_GLYPH() instead.
 *
 * Return value: a glyph index into @font.
 **/
PangoGlyph
pango_xft_font_get_unknown_glyph (PangoFont *font,
				  gunichar   wc)
{
  g_return_val_if_fail (PANGO_XFT_IS_FONT (font), PANGO_GLYPH_EMPTY);

  return pango_fc_font_get_unknown_glyph (PANGO_FC_FONT (font), wc);
}

/**
 * pango_xft_font_lock_face:
 * @font: a #PangoFont.
 *
 * Gets the FreeType <type>FT_Face</type> associated with a font,
 * This face will be kept around until you call
 * pango_xft_font_unlock_face().
 *
 * Use pango_fc_font_lock_face() instead.
 *
 * Return value: the FreeType <type>FT_Face</type> associated with @font.
 *
 * Since: 1.2
 **/
FT_Face
pango_xft_font_lock_face (PangoFont *font)
{
  g_return_val_if_fail (PANGO_XFT_IS_FONT (font), NULL);

  return pango_fc_font_lock_face (PANGO_FC_FONT (font));
}

/**
 * pango_xft_font_unlock_face:
 * @font: a #PangoFont.
 *
 * Releases a font previously obtained with
 * pango_xft_font_lock_face().
 *
 * Use pango_fc_font_unlock_face() instead.
 *
 * Since: 1.2
 **/
void
pango_xft_font_unlock_face (PangoFont *font)
{
  g_return_if_fail (PANGO_XFT_IS_FONT (font));

  pango_fc_font_unlock_face (PANGO_FC_FONT (font));
}

/**
 * pango_xft_font_get_glyph:
 * @font: a #PangoFont for the Xft backend
 * @wc: Unicode codepoint to look up
 *
 * Gets the glyph index for a given Unicode character
 * for @font. If you only want to determine
 * whether the font has the glyph, use pango_xft_font_has_char().
 *
 * Use pango_fc_font_get_glyph() instead.
 *
 * Return value: the glyph index, or 0, if the Unicode
 *  character does not exist in the font.
 *
 * Since: 1.2
 **/
guint
pango_xft_font_get_glyph (PangoFont *font,
			  gunichar   wc)
{
  g_return_val_if_fail (PANGO_XFT_IS_FONT (font), 0);

  return pango_fc_font_get_glyph (PANGO_FC_FONT (font), wc);
}

/**
 * pango_xft_font_has_char:
 * @font: a #PangoFont for the Xft backend
 * @wc: Unicode codepoint to look up
 *
 * Determines whether @font has a glyph for the codepoint @wc.
 *
 * Use pango_fc_font_has_char() instead.
 *
 * Return value: %TRUE if @font has the requested codepoint.
 *
 * Since: 1.2
 **/
gboolean
pango_xft_font_has_char (PangoFont *font,
			 gunichar   wc)
{
  g_return_val_if_fail (PANGO_XFT_IS_FONT (font), 0);

  return pango_fc_font_has_char (PANGO_FC_FONT (font), wc);
}