Add font support to PageSerializer

Source/core/page/PageSerializer.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/page/PageSerializer.h"
 
 #include "HTMLNames.h"
+#include "core/css/CSSFontFaceRule.h"
+#include "core/css/CSSFontFaceSrcValue.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSImportRule.h"
+#include "core/css/CSSStyleDeclaration.h"
 #include "core/css/CSSStyleRule.h"
+#include "core/css/CSSValueList.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/Text.h"
 #include "core/editing/MarkupAccumulator.h"
+#include "core/fetch/FontResource.h"
 #include "core/fetch/ImageResource.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLinkElement.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/html/parser/HTMLMetaCharsetParser.h"
 #include "core/page/Frame.h"
 #include "core/page/Page.h"
 #include "core/platform/SerializedResource.h"
@@ skipping 208 matching lines @@
         }
         Document* document = styleSheet->ownerDocument();
         // Some rules have resources associated with them that we need to retrieve.
         if (rule->type() == CSSRule::IMPORT_RULE) {
             CSSImportRule* importRule = static_cast<CSSImportRule*>(rule);
             KURL importURL = document->completeURL(importRule->href());
             if (m_resourceURLs.contains(importURL))
                 continue;
             serializeCSSStyleSheet(importRule->styleSheet(), importURL);
         } else if (rule->type() == CSSRule::FONT_FACE_RULE) {
-            // FIXME: Add support for font face rule. It is not clear to me at this point if the actual otf/eot file can
-            // be retrieved from the CSSFontFaceRule object.
+            retrieveResourcesForProperties((static_cast<CSSFontFaceRule*>(rule)->styleRule())->properties(), document);

[Julien - ping for review, 2013/09/05 17:38:48]

Doing direct static_cast should be avoided. You should just expose the following
method in CSSFontFaceRule.h

inline CSSFontFaceRule* toCSSFontFaceRule(CSSRule* rule)
{
    ASSERT_WITH_SECURITY_IMPLICATION(rule->type() == CSSRule::FONT_FACE_RULE);
// Or whatever check to ensure that the cast is OK
    return static_cast<CSSFontFaceRule*>(rule);
}

         } else if (rule->type() == CSSRule::STYLE_RULE) {
-            retrieveResourcesForRule(static_cast<CSSStyleRule*>(rule)->styleRule(), document);
+            retrieveResourcesForProperties((static_cast<CSSStyleRule*>(rule)->styleRule())->properties(), document);

[Julien - ping for review, 2013/09/05 17:38:48]

I would apply the same pattern here too. I won't repeat this comment for the
other static casts.

         }
     }
 
     if (url.isValid() && !m_resourceURLs.contains(url)) {
         // FIXME: We should check whether a charset has been specified and if none was found add one.
         WTF::TextEncoding textEncoding(styleSheet->contents()->charset());
         ASSERT(textEncoding.isValid());
         String textString = cssText.toString();
         CString text = textEncoding.normalizeAndEncode(textString, WTF::EntitiesForUnencodables);
         m_resources->append(SerializedResource(url, String("text/css"), SharedBuffer::create(text.data(), text.length())));
         m_resourceURLs.add(url);
     }
 }
 
+bool PageSerializer::shouldAddURL(const KURL& url)
+{
+    return url.isValid() && !m_resourceURLs.contains(url) && !url.protocolIsData();
+}
+
+void PageSerializer::addToResources(Resource *resource, PassRefPtr<SharedBuffer> data, const KURL& url)

[Julien - ping for review, 2013/09/05 17:38:48]

Style violation, it should be: Resource* resource, ...

+{
+    if (!data) {
+        LOG_ERROR("No data for resource %s", url.string().utf8().data());
+        return;
+    }
+
+    String mimeType = resource->response().mimeType();
+    m_resources->append(SerializedResource(url, mimeType, data));
+    m_resourceURLs.add(url);
+}
+
 void PageSerializer::addImageToResources(ImageResource* image, RenderObject* imageRenderer, const KURL& url)
 {
-    if (!url.isValid() || m_resourceURLs.contains(url) || url.protocolIsData())
+    if (!shouldAddURL(url))
         return;
 
     if (!image || image->image() == Image::nullImage())
         return;
 
     RefPtr<SharedBuffer> data = imageRenderer ? image->imageForRenderer(imageRenderer)->data() : 0;
     if (!data)
         data = image->image()->data();
 
-    if (!data) {
-        LOG_ERROR("No data for image %s", url.string().utf8().data());
+    addToResources(image, data, url);
+}
+
+void PageSerializer::addFontToResources(FontResource* font)
+{
+    if (!font || !shouldAddURL(font->url()) || !font->isLoaded() || !font->resourceBuffer()) {
         return;
     }
+    RefPtr<SharedBuffer> data(font->resourceBuffer());
 
-    String mimeType = image->response().mimeType();
-    m_resources->append(SerializedResource(url, mimeType, data));
-    m_resourceURLs.add(url);
-}
-
-void PageSerializer::retrieveResourcesForRule(StyleRule* rule, Document* document)
-{
-    retrieveResourcesForProperties(rule->properties(), document);
+    addToResources(font, data, font->url());
 }
 
 void PageSerializer::retrieveResourcesForProperties(const StylePropertySet* styleDeclaration, Document* document)
 {
     if (!styleDeclaration)
         return;
 
     // The background-image and list-style-image (for ul or ol) are the CSS properties
     // that make use of images. We iterate to make sure we include any other
     // image properties there might be.
     unsigned propertyCount = styleDeclaration->propertyCount();
     for (unsigned i = 0; i < propertyCount; ++i) {
         RefPtr<CSSValue> cssValue = styleDeclaration->propertyAt(i).value();
-        if (!cssValue->isImageValue())
-            continue;
+        retrieveResourcesForCSSValue(cssValue.get(), document);
+    }
+}
 
-        CSSImageValue* imageValue = toCSSImageValue(cssValue.get());
+void PageSerializer::retrieveResourcesForCSSValue(CSSValue* cssValue, Document* document)
+{
+    if (cssValue->isImageValue()) {
+        CSSImageValue* imageValue = toCSSImageValue(cssValue);
         StyleImage* styleImage = imageValue->cachedOrPendingImage();
         // Non cached-images are just place-holders and do not contain data.
         if (!styleImage || !styleImage->isImageResource())
-            continue;
+            return;
 
         ImageResource* image = static_cast<StyleFetchedImage*>(styleImage)->cachedImage();
         addImageToResources(image, 0, image->url());
+    } else if (cssValue->isFontFaceSrcValue()) {
+        CSSFontFaceSrcValue* fontFaceSrcValue = static_cast<CSSFontFaceSrcValue*>(cssValue);
+        if (fontFaceSrcValue->isLocal()) {
+            return;
+        }
+
+        addFontToResources(fontFaceSrcValue->fetch(document));
+    } else if (cssValue->isValueList()) {
+        CSSValueList* cssValueList = static_cast<CSSValueList*>(cssValue);
+        for (unsigned i = 0; i < cssValueList->length(); i++) {

[Julien - ping for review, 2013/09/05 17:38:48]

One line statement don't need curly braces.

+            retrieveResourcesForCSSValue(cssValueList->item(i), document);
+        }
     }
 }
 
 KURL PageSerializer::urlForBlankFrame(Frame* frame)
 {
     HashMap<Frame*, KURL>::iterator iter = m_blankFrameURLs.find(frame);
     if (iter != m_blankFrameURLs.end())
         return iter->value;
     String url = "wyciwyg://frame/" + String::number(m_blankFrameCounter++);
     KURL fakeURL(ParsedURLString, url);
     m_blankFrameURLs.add(frame, fakeURL);
 
     return fakeURL;
 }
 
 }