Guard Xft backend agains crashes too.

2006-02-02  Behdad Esfahbod  <behdad@gnome.org>

        * pango/pangoxft-font.c, pango/pangoxft-render.c: Guard Xft
        backend agains crashes too.

3 files changed, 67 insertions, 22 deletions

diff --git a/pango/pangoxft-font.c b/pango/pangoxft-font.c
index c7004c0c..f67d7b5b 100644
--- a/pango/pangoxft-font.c
+++ b/pango/pangoxft-font.c
@@ -27,6 +27,8 @@
 #include "pangoxft-private.h"
 #include "pangofc-private.h"
 
+PangoXftWarningHistory _pango_xft_warning_history = { FALSE };
+
 #define PANGO_XFT_FONT_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_XFT_FONT, PangoXftFontClass))
 #define PANGO_XFT_IS_FONT_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_XFT_FONT))
 #define PANGO_XFT_FONT_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_XFT_FONT, PangoXftFontClass))
@@ -121,7 +123,8 @@ _pango_xft_font_get_mini_font (PangoXftFont *xfont)
 {
   PangoFcFont *fcfont = (PangoFcFont *)xfont;
 
-  g_assert (fcfont->fontmap);
+  if (!fcfont || !fcfont->fontmap)
+    return NULL;
 
   if (!xfont->mini_font)
     {
@@ -150,6 +153,8 @@ _pango_xft_font_get_mini_font (PangoXftFont *xfont)
 	pango_font_description_set_size (desc, new_size);
 
       xfont->mini_font = pango_font_map_load_font (fcfont->fontmap, context, desc);
+      if (!xfont->mini_font)
+        return NULL;
 
       pango_font_description_free (desc);
       g_object_unref (context);
@@ -474,7 +479,15 @@ pango_xft_font_real_shutdown (PangoFcFont *fcfont)
 XftFont *
 pango_xft_font_get_font (PangoFont *font)
 {
-  g_return_val_if_fail (PANGO_XFT_IS_FONT (font), NULL);
+  if (G_UNLIKELY (!PANGO_XFT_IS_FONT (font)))
+    {
+      if (!_pango_xft_warning_history.get_font)
+        {
+	  _pango_xft_warning_history.get_font = TRUE;
+	  g_critical ("pango_xft_font_get_font called with font == NULL, expect ugly output");
+	}
+      return NULL;
+    }
   
   return xft_font_get_font (font);
 }
diff --git a/pango/pangoxft-private.h b/pango/pangoxft-private.h
index 1a00860a..82e57da7 100644
--- a/pango/pangoxft-private.h
+++ b/pango/pangoxft-private.h
@@ -55,6 +55,14 @@ PangoRenderer *_pango_xft_font_map_get_renderer (PangoXftFontMap *xftfontmap);
 
 PangoFont *_pango_xft_font_get_mini_font (PangoXftFont *xfont);
 
+typedef struct _PangoXftWarningHistory PangoXftWarningHistory;
+
+struct _PangoXftWarningHistory {
+  guint get_font		: 1;
+}; 
+
+extern PangoXftWarningHistory _pango_xft_warning_history;
+
 G_END_DECLS
 
 #endif /* __PANGOXFT_PRIVATE_H__ */
diff --git a/pango/pangoxft-render.c b/pango/pangoxft-render.c
index 3e089bdd..d95bce65 100644
--- a/pango/pangoxft-render.c
+++ b/pango/pangoxft-render.c
@@ -22,6 +22,7 @@
 #include <config.h>
 #include <math.h>
 
+#include "pango-engine-private.h"
 #include "pangoxft-render.h"
 #include "pangoxft-private.h"
 
@@ -297,20 +298,20 @@ box_in_bounds (PangoRenderer *renderer,
 
 static void
 draw_box (PangoRenderer *renderer,
-	  PangoXftFont  *xfont,
+	  gint           line_width,
 	  gint           x,
 	  gint           y,
 	  gint           width,
 	  gint           height)
 {
   pango_renderer_draw_rectangle (renderer, PANGO_RENDER_PART_FOREGROUND,
-				 x, y, width, xfont->mini_pad);
+				 x, y, width, line_width);
   pango_renderer_draw_rectangle (renderer, PANGO_RENDER_PART_FOREGROUND,
-				 x, y + xfont->mini_pad, xfont->mini_pad, height - xfont->mini_pad * 2);
+				 x, y + line_width, line_width, height - line_width * 2);
   pango_renderer_draw_rectangle (renderer, PANGO_RENDER_PART_FOREGROUND,
-				 x + width - xfont->mini_pad, y + xfont->mini_pad, xfont->mini_pad, height - xfont->mini_pad * 2);
+				 x + width - line_width, y + line_width, line_width, height - line_width * 2);
   pango_renderer_draw_rectangle (renderer, PANGO_RENDER_PART_FOREGROUND,
-				 x, y + height - xfont->mini_pad, width, xfont->mini_pad);
+				 x, y + height - line_width, width, line_width);
 }
 
 static void
@@ -326,7 +327,31 @@ pango_xft_renderer_draw_glyphs (PangoRenderer    *renderer,
   int i;
   int x_off = 0;
 
-  if (!fcfont->fontmap)		/* Display closed */
+  if (!fcfont)
+    {
+      for (i=0; i<glyphs->num_glyphs; i++)
+	{
+	  PangoGlyph glyph = glyphs->glyphs[i].glyph;
+	  int glyph_x = x + x_off + glyphs->glyphs[i].geometry.x_offset;
+	  int glyph_y = y + glyphs->glyphs[i].geometry.y_offset;
+
+	  if (glyph != PANGO_GLYPH_NULL && glyph & PANGO_GLYPH_UNKNOWN_FLAG)
+	    {
+	      int x = glyph_x + PANGO_SCALE;
+	      int y = glyph_y + PANGO_SCALE;
+	      int width = PANGO_SCALE * (PANGO_UNKNOWN_GLYPH_WIDTH - 2);
+	      int height = PANGO_SCALE * (PANGO_UNKNOWN_GLYPH_HEIGHT - 2);
+
+	      if (box_in_bounds (renderer, x, y, width, height))
+		draw_box (renderer, PANGO_SCALE, x, y, width, height);
+	    }
+
+          x_off += glyphs->glyphs[i].geometry.width;
+	}
+      return;
+    }
+
+  if (!fcfont->fontmap)	/* Display closed */
     return;
 
   for (i=0; i<glyphs->num_glyphs; i++)
@@ -359,23 +384,23 @@ pango_xft_renderer_draw_glyphs (PangoRenderer    *renderer,
 	      xs[2] = xs[1] + xfont->mini_width + xfont->mini_pad;
 	      xs[3] = xs[2] + xfont->mini_width + xfont->mini_pad;
 
-              if (glyph > 0xffff)
-                {
-                  cols = 3;
-                  g_snprintf (buf, sizeof(buf), "%06X", glyph);
-                }
-              else
-                {
-                  cols = 2;
-                  g_snprintf (buf, sizeof(buf), "%04X", glyph);
-                }
+	      if (glyph > 0xffff)
+		{
+		  cols = 3;
+		  g_snprintf (buf, sizeof(buf), "%06X", glyph);
+		}
+	      else
+		{
+		  cols = 2;
+		  g_snprintf (buf, sizeof(buf), "%04X", glyph);
+		}
 
 	      if (box_in_bounds (renderer,
 				 xs[0], ys[0],
 				 xfont->mini_width * cols + xfont->mini_pad * (2 * cols + 1),
 				 xfont->mini_height * 2 + xfont->mini_pad * 5))
 		{
-		  draw_box (renderer, xfont,
+		  draw_box (renderer, xfont->mini_pad,
 			    xs[0], ys[0],
 			    xfont->mini_width * cols + xfont->mini_pad * (2 * cols + 1),
 			    xfont->mini_height * 2 + xfont->mini_pad * 5);
@@ -391,10 +416,9 @@ pango_xft_renderer_draw_glyphs (PangoRenderer    *renderer,
 		      }
 		}
 	    }
-	  else if (glyph)
+	  else
 	    {
-	      draw_glyph (renderer, font,
-			  glyph, glyph_x, glyph_y);
+	      draw_glyph (renderer, font, glyph, glyph_x, glyph_y);
 	    }
 	}