Add FontRenderParamsQuery.

ui/gfx/font_render_params_linux.cc

Index: ui/gfx/font_render_params_linux.cc
diff --git a/ui/gfx/font_render_params_linux.cc b/ui/gfx/font_render_params_linux.cc
index bba66d43b5271806ab54c0b93e5b33552df5af90..e8e60e3e68ac7061e9ee5b4e4fc20c2eff196dab 100644
--- a/ui/gfx/font_render_params_linux.cc
+++ b/ui/gfx/font_render_params_linux.cc
@@ -38,12 +38,8 @@ FontRenderParams::SubpixelRendering ConvertFontconfigRgba(int rgba) {
 }
 
 // Queries Fontconfig for rendering settings and updates |params_out| and
-// |family_out| (if non-NULL). Returns false on failure. See
-// GetCustomFontRenderParams() for descriptions of arguments.
-bool QueryFontconfig(const std::vector<std::string>* family_list,
-                     const int* pixel_size,
-                     const int* point_size,
-                     const int* style,
+// |family_out| (if non-NULL). Returns false on failure.
+bool QueryFontconfig(const FontRenderParamsQuery& query,
                      FontRenderParams* params_out,
                      std::string* family_out) {
   FcPattern* pattern = FcPatternCreate();
@@ -51,22 +47,20 @@ bool QueryFontconfig(const std::vector<std::string>* family_list,
 
   FcPatternAddBool(pattern, FC_SCALABLE, FcTrue);
 
-  if (family_list) {
-    for (std::vector<std::string>::const_iterator it = family_list->begin();
-         it != family_list->end(); ++it) {
-      FcPatternAddString(
-          pattern, FC_FAMILY, reinterpret_cast<const FcChar8*>(it->c_str()));
-    }
+  for (std::vector<std::string>::const_iterator it = query.families.begin();
+       it != query.families.end(); ++it) {
+    FcPatternAddString(
+        pattern, FC_FAMILY, reinterpret_cast<const FcChar8*>(it->c_str()));
   }
-  if (pixel_size)
-    FcPatternAddDouble(pattern, FC_PIXEL_SIZE, *pixel_size);
-  if (point_size)
-    FcPatternAddInteger(pattern, FC_SIZE, *point_size);
-  if (style) {
+  if (query.pixel_size > 0)
+    FcPatternAddDouble(pattern, FC_PIXEL_SIZE, query.pixel_size);
+  if (query.point_size > 0)
+    FcPatternAddInteger(pattern, FC_SIZE, query.point_size);
+  if (query.style >= 0) {
     FcPatternAddInteger(pattern, FC_SLANT,
-        (*style & Font::ITALIC) ? FC_SLANT_ITALIC : FC_SLANT_ROMAN);
+        (query.style & Font::ITALIC) ? FC_SLANT_ITALIC : FC_SLANT_ROMAN);
     FcPatternAddInteger(pattern, FC_WEIGHT,
-        (*style & Font::BOLD) ? FC_WEIGHT_BOLD : FC_WEIGHT_NORMAL);
+        (query.style & Font::BOLD) ? FC_WEIGHT_BOLD : FC_WEIGHT_NORMAL);
   }
 
   FcConfigSubstitute(NULL, pattern, FcMatchPattern);
@@ -120,31 +114,10 @@ bool QueryFontconfig(const std::vector<std::string>* family_list,
   return true;
 }
 
-// Returns the system's default settings.
-FontRenderParams LoadDefaults(bool for_web_contents) {
-  return GetCustomFontRenderParams(
-      for_web_contents, NULL, NULL, NULL, NULL, NULL);
-}
-
 }  // namespace
 
-const FontRenderParams& GetDefaultFontRenderParams() {
-  static FontRenderParams default_params = LoadDefaults(false);
-  return default_params;
-}
-
-const FontRenderParams& GetDefaultWebKitFontRenderParams() {
-  static FontRenderParams default_params = LoadDefaults(true);
-  return default_params;
-}
-
-FontRenderParams GetCustomFontRenderParams(
-    bool for_web_contents,
-    const std::vector<std::string>* family_list,
-    const int* pixel_size,
-    const int* point_size,
-    const int* style,
-    std::string* family_out) {
+FontRenderParams GetFontRenderParams(const FontRenderParamsQuery& query,
+                                     std::string* family_out) {
   if (family_out)
     family_out->clear();
 
@@ -153,12 +126,11 @@ FontRenderParams GetCustomFontRenderParams(
   const LinuxFontDelegate* delegate = LinuxFontDelegate::instance();
   if (delegate)
     params = delegate->GetDefaultFontRenderParams();
-  QueryFontconfig(
-      family_list, pixel_size, point_size, style, &params, family_out);
+  QueryFontconfig(query, &params, family_out);
 
   // Fontconfig doesn't support configuring subpixel positioning; check a flag.
   params.subpixel_positioning = CommandLine::ForCurrentProcess()->HasSwitch(
-      for_web_contents ?
+      query.for_web_contents ?
       switches::kEnableWebkitTextSubpixelPositioning :
       switches::kEnableBrowserTextSubpixelPositioning);
 
@@ -167,9 +139,8 @@ FontRenderParams GetCustomFontRenderParams(
     params.hinting = FontRenderParams::HINTING_NONE;
 
   // 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];
+  if (family_out && family_out->empty() && !query.families.empty())
+    *family_out = query.families[0];
 
   return params;
 }