pangocairo-render.c

GTK+-2.0源码之pango-1.15.6.tar.gz

					   int            width,
					   int            height)
{
  PangoCairoRenderer *crenderer = (PangoCairoRenderer *) (renderer);
  cairo_t *cr = crenderer->cr;

  if (!crenderer->do_path)
    {
      cairo_save (cr);

      set_color (crenderer, PANGO_RENDER_PART_UNDERLINE);

      cairo_new_path (cr);
    }

  draw_error_underline (cr,
			crenderer->x_offset + (double)x / PANGO_SCALE,
			crenderer->y_offset + (double)y / PANGO_SCALE,
			(double)width / PANGO_SCALE, (double)height / PANGO_SCALE);

  if (!crenderer->do_path)
    {
      cairo_fill (cr);

      cairo_restore (cr);
    }
}

static void
pango_cairo_renderer_init (PangoCairoRenderer *renderer)
{
}

static void
pango_cairo_renderer_class_init (PangoCairoRendererClass *klass)
{
  PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);

  renderer_class->draw_glyphs = pango_cairo_renderer_draw_glyphs;
  renderer_class->draw_rectangle = pango_cairo_renderer_draw_rectangle;
  renderer_class->draw_error_underline = pango_cairo_renderer_draw_error_underline;
}

static PangoCairoRenderer *cached_renderer = NULL;
G_LOCK_DEFINE_STATIC (cached_renderer);

static PangoCairoRenderer *
acquire_renderer (gboolean *free_renderer)
{
  PangoCairoRenderer *renderer;

  /* renderer = _pango_cairo_font_map_get_renderer (PANGO_CAIRO_FONT_MAP (fontmap)); */

  if (G_LIKELY (G_TRYLOCK (cached_renderer)))
    {
      if (G_UNLIKELY (!cached_renderer))
	cached_renderer = g_object_new (PANGO_TYPE_CAIRO_RENDERER, NULL);

      renderer = cached_renderer;
      *free_renderer = FALSE;
    }
  else
    {
      renderer = g_object_new (PANGO_TYPE_CAIRO_RENDERER, NULL);
      *free_renderer = TRUE;
    }

  return renderer;
}

static void
release_renderer (PangoCairoRenderer *renderer, gboolean free_renderer)
{
  if (G_LIKELY (!free_renderer))
    {
      renderer->cr = NULL;
      renderer->do_path = FALSE;
      renderer->x_offset = 0.;
      renderer->y_offset = 0.;

      G_UNLOCK (cached_renderer);
    }
  else
    g_object_unref (renderer);
}


/* convenience wrappers using the default renderer */


static void
_pango_cairo_do_glyph_string (cairo_t          *cr,
			      PangoFont        *font,
			      PangoGlyphString *glyphs,
			      gboolean          do_path)
{
  gboolean free_renderer;
  PangoCairoRenderer *crenderer = acquire_renderer (&free_renderer);
  PangoRenderer *renderer = (PangoRenderer *) crenderer;

  crenderer->cr = cr;
  crenderer->do_path = do_path;
  cairo_get_current_point (cr, &crenderer->x_offset, &crenderer->y_offset);

  if (!do_path)
    {
      /* unset all part colors, since when drawing just a glyph string,
       * prepare_run() isn't called.
       */

      pango_renderer_activate (renderer);

      pango_renderer_set_color (renderer, PANGO_RENDER_PART_FOREGROUND, NULL);
      pango_renderer_set_color (renderer, PANGO_RENDER_PART_BACKGROUND, NULL);
      pango_renderer_set_color (renderer, PANGO_RENDER_PART_UNDERLINE, NULL);
      pango_renderer_set_color (renderer, PANGO_RENDER_PART_STRIKETHROUGH, NULL);
    }

  pango_renderer_draw_glyphs (renderer, font, glyphs, 0, 0);

  if (!do_path)
    {
      pango_renderer_deactivate (renderer);
    }

  release_renderer (crenderer, free_renderer);
}

static void
_pango_cairo_do_layout_line (cairo_t          *cr,
			     PangoLayoutLine  *line,
			     gboolean          do_path)
{
  gboolean free_renderer;
  PangoCairoRenderer *crenderer = acquire_renderer (&free_renderer);
  PangoRenderer *renderer = (PangoRenderer *) crenderer;

  crenderer->cr = cr;
  crenderer->do_path = do_path;
  cairo_get_current_point (cr, &crenderer->x_offset, &crenderer->y_offset);

  pango_renderer_draw_layout_line (renderer, line, 0, 0);

  release_renderer (crenderer, free_renderer);
}

static void
_pango_cairo_do_layout (cairo_t     *cr,
			PangoLayout *layout,
			gboolean     do_path)
{
  gboolean free_renderer;
  PangoCairoRenderer *crenderer = acquire_renderer (&free_renderer);
  PangoRenderer *renderer = (PangoRenderer *) crenderer;

  crenderer->cr = cr;
  crenderer->do_path = do_path;
  cairo_get_current_point (cr, &crenderer->x_offset, &crenderer->y_offset);

  pango_renderer_draw_layout (renderer, layout, 0, 0);

  release_renderer (crenderer, free_renderer);
}

static void
_pango_cairo_do_error_underline (cairo_t *cr,
				 double   x,
				 double   y,
				 double   width,
				 double   height,
				 gboolean do_path)
{
  /* We don't use a renderer here, for a simple reason:
   * the only renderer we can get is the default renderer, that
   * is all implemented here, so we shortcircuit and make our
   * life way easier.
   */

  if (!do_path)
    cairo_new_path (cr);

  draw_error_underline (cr, x, y, width, height);

  if (!do_path)
    cairo_fill (cr);
}


/* public wrapper of above to show or append path */


/**
 * pango_cairo_show_glyph_string:
 * @cr: a Cairo context
 * @font: a #PangoFont
 * @glyphs: a #PangoGlyphString
 *
 * Draws the glyphs in @glyphs in the specified cairo context.
 * The origin of the glyphs (the left edge of the baseline) will
 * be drawn at the current point of the cairo context.
 *
 * Since: 1.10
 **/
void
pango_cairo_show_glyph_string (cairo_t          *cr,
			       PangoFont        *font,
			       PangoGlyphString *glyphs)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail (glyphs != NULL);

  _pango_cairo_do_glyph_string (cr, font, glyphs, FALSE);
}

/**
 * pango_cairo_show_layout_line:
 * @cr: a Cairo context
 * @line: a #PangoLayoutLine
 *
 * Draws a #PangoLayoutLine in the specified cairo context.
 * The origin of the glyphs (the left edge of the line) will
 * be drawn at the current point of the cairo context.
 *
 * Since: 1.10
 **/
void
pango_cairo_show_layout_line (cairo_t          *cr,
			      PangoLayoutLine  *line)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail (line != NULL);

  _pango_cairo_do_layout_line (cr, line, FALSE);
}

/**
 * pango_cairo_show_layout:
 * @cr: a Cairo context
 * @layout: a Pango layout
 *
 * Draws a #PangoLayoutLine in the specified cairo context.
 * The top-left corner of the #PangoLayout will be drawn
 * at the current point of the cairo context.
 *
 * Since: 1.10
 **/
void
pango_cairo_show_layout (cairo_t     *cr,
			 PangoLayout *layout)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail (PANGO_IS_LAYOUT (layout));

  _pango_cairo_do_layout (cr, layout, FALSE);
}

/**
 * pango_cairo_show_error_underline:
 * @cr: a Cairo context
 * @x: The X coordinate of one corner of the rectangle
 * @y: The Y coordinate of one corner of the rectangle
 * @width: Non-negative width of the rectangle
 * @height: Non-negative height of the rectangle
 *
 * Draw a squiggly line in the specified cairo context that approximately
 * covers the given rectangle in the style of an underline used to indicate a
 * spelling error.  (The width of the underline is rounded to an integer
 * number of up/down segments and the resulting rectangle is centered in the
 * original rectangle)
 *
 * Since: 1.14
 **/
void
pango_cairo_show_error_underline (cairo_t *cr,
				  double  x,
				  double  y,
				  double  width,
				  double  height)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail ((width >= 0) && (height >= 0));

  _pango_cairo_do_error_underline (cr, x, y, width, height, FALSE);
}

/**
 * pango_cairo_glyph_string_path
 * @cr: a Cairo context
 * @font: a #PangoFont
 * @glyphs: a #PangoGlyphString
 *
 * Adds the glyphs in @glyphs to the current path in the specified
 * cairo context. The origin of the glyphs (the left edge of the baseline)
 * will be at the current point of the cairo context.
 *
 * Since: 1.10
 **/
void
pango_cairo_glyph_string_path (cairo_t          *cr,
			       PangoFont        *font,
			       PangoGlyphString *glyphs)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail (glyphs != NULL);

  _pango_cairo_do_glyph_string (cr, font, glyphs, TRUE);
}

/**
 * pango_cairo_layout_line_path:
 * @cr: a Cairo context
 * @line: a #PangoLayoutLine
 *
 * Adds the text in #PangoLayoutLine to the current path in the
 * specified cairo context.  The origin of the glyphs (the left edge
 * of the line) will be at the current point of the cairo context.
 *
 * Since: 1.10
 **/
void
pango_cairo_layout_line_path (cairo_t          *cr,
			      PangoLayoutLine  *line)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail (line != NULL);

  _pango_cairo_do_layout_line (cr, line, TRUE);
}

/**
 * pango_cairo_layout_path:
 * @cr: a Cairo context
 * @layout: a Pango layout
 *
 * Adds the text in a #PangoLayout to the current path in the
 * specified cairo context.  The top-left corner of the #PangoLayout
 * will be at the current point of the cairo context.
 *
 * Since: 1.10
 **/
void
pango_cairo_layout_path (cairo_t     *cr,
			 PangoLayout *layout)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail (PANGO_IS_LAYOUT (layout));

  _pango_cairo_do_layout (cr, layout, TRUE);
}

/**
 * pango_cairo_error_underline_path:
 * @cr: a Cairo context
 * @x: The X coordinate of one corner of the rectangle
 * @y: The Y coordinate of one corner of the rectangle
 * @width: Non-negative width of the rectangle
 * @height: Non-negative height of the rectangle
 *
 * Add a squiggly line to the current path in the specified cairo context that
 * approximately covers the given rectangle in the style of an underline used
 * to indicate a spelling error.  (The width of the underline is rounded to an
 * integer number of up/down segments and the resulting rectangle is centered
 * in the original rectangle)
 *
 * Since: 1.14
 **/
void
pango_cairo_error_underline_path (cairo_t *cr,
				  double   x,
				  double   y,
				  double   width,
				  double   height)
{
  g_return_if_fail (cr != NULL);
  g_return_if_fail ((width >= 0) && (height >= 0));

  _pango_cairo_do_error_underline (cr, x, y, width, height, TRUE);
}