linux: Avoid using unset Fontconfig properties.

ui/gfx/font_render_params_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/font_render_params.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/linux_font_delegate.h"
@@ skipping 68 matching lines @@
 
   if (family_out) {
     FcChar8* family = NULL;
     FcPatternGetString(match, FC_FAMILY, 0, &family);
     if (family)
       family_out->assign(reinterpret_cast<const char*>(family));
   }
 
   if (params_out) {
     FcBool fc_antialias = 0;
-    FcPatternGetBool(match, FC_ANTIALIAS, 0, &fc_antialias);
-    params_out->antialiasing = fc_antialias;
+    if (FcPatternGetBool(match, FC_ANTIALIAS, 0, &fc_antialias) ==
+        FcResultMatch) {
+      params_out->antialiasing = fc_antialias;
+    }
 
     FcBool fc_autohint = 0;
-    FcPatternGetBool(match, FC_AUTOHINT, 0, &fc_autohint);
-    params_out->autohinter = fc_autohint;
+    if (FcPatternGetBool(match, FC_AUTOHINT, 0, &fc_autohint) ==
+        FcResultMatch) {
+      params_out->autohinter = fc_autohint;
+    }
 
     FcBool fc_bitmap = 0;
-    FcPatternGetBool(match, FC_EMBEDDED_BITMAP, 0, &fc_bitmap);
-    params_out->use_bitmaps = fc_bitmap;
+    if (FcPatternGetBool(match, FC_EMBEDDED_BITMAP, 0, &fc_bitmap) ==
+        FcResultMatch) {
+      params_out->use_bitmaps = fc_bitmap;
+    }
 
     FcBool fc_hinting = 0;
-    int fc_hint_style = FC_HINT_NONE;
-    FcPatternGetBool(match, FC_HINTING, 0, &fc_hinting);
-    if (fc_hinting)
-      FcPatternGetInteger(match, FC_HINT_STYLE, 0, &fc_hint_style);
-    params_out->hinting = ConvertFontconfigHintStyle(fc_hint_style);
+    if (FcPatternGetBool(match, FC_HINTING, 0, &fc_hinting) == FcResultMatch) {
+      int fc_hint_style = FC_HINT_NONE;
+      if (fc_hinting)
+        FcPatternGetInteger(match, FC_HINT_STYLE, 0, &fc_hint_style);
+      params_out->hinting = ConvertFontconfigHintStyle(fc_hint_style);
+    }
 
     int fc_rgba = FC_RGBA_NONE;
-    FcPatternGetInteger(match, FC_RGBA, 0, &fc_rgba);
-    params_out->subpixel_rendering = ConvertFontconfigRgba(fc_rgba);
+    if (FcPatternGetInteger(match, FC_RGBA, 0, &fc_rgba) == FcResultMatch)
+      params_out->subpixel_rendering = ConvertFontconfigRgba(fc_rgba);
   }
 
   FcPatternDestroy(match);
   return true;
 }
 
 // Returns the system's default settings.
 FontRenderParams LoadDefaults(bool for_web_contents) {
   return GetCustomFontRenderParams(
       for_web_contents, NULL, NULL, NULL, NULL, NULL);
@@ skipping 41 matching lines @@
 
   // Use the first family from the list if Fontconfig didn't suggest a family.
   if (family_out && family_out->empty() &&
       family_list && !family_list->empty())
     *family_out = (*family_list)[0];
 
   return params;
 }
 
 }  // namespace gfx