[webkit-dev] Font Name

Sat May 21 10:55:37 PDT 2011

Hi,

When you are drawing  some text, you create a RenderText(RenderObject) which
has all the rendering info & the m_style of RenderText has the style info
required to render the text.

Let's consider the following style data I have in my html page
<style type="text/css">
body.rahaman{
font:30px courier;
}
</style>
<body class="rahaman"> Rahaman </body>

Once the HTMLTreeBuilder parses the token, it creates HTMLStyleElement &
CSSStyleSheet & then asks the CSSParser to parse the StyleSheet. From there
it comes to CSSParser::parseValue()=>CSSParser::parseFont() as the I have
only used font property

We create a FontValue (which contain all the attribute a font property can
have like style, size, variant, family etc=> in this font_family, you can
actually see the font name you have used ). In CSSParser::parseFont, we
populate the FontValue structure (you can find the font family name in
font->family), calls CSSParser::addProperty() where we create a CSSProperty
with the FontValue/CSSValue being passed & this property is being stored in
CSSParser::m_parsedProperties.

Then we call CSSParser::createStyleRule where we used the m_parsedProperties
mentioned before to create a CSSMutableStyleDeclaration & set this
declaration for the CSSRule.

We then create CSSStyleSelector and call CSSStyleSelector::styleForElement
for the root element. Here somehow (I don't have much details what happens
in berween but figured out that we retrieve the same
CSSMutableStyleDeclaration mentioned above) & call
CSSStyleSelector::applyProperty(). Here each StyleSelector has its
RenderStyle (m_style), where from we retrieve the FontDescription & add the
properties accordingly. On the other hand, each RenderObject (the
corresponding node in the RenderTree for a node in DOM tree) has
RenderStyle, which gets the value we retrieved above.

Finally we call GraphicsContext::drawText() passing the Font which we have
retrieved from the RenderStyle we dsicussed above.

I am not sure if this is what you were looking for, I just shared whatever I
knew of the related area. Please let me know if you need anything else.

Thanks,
Rahaman

On Fri, May 20, 2011 at 12:22 AM, Soheil Servati Beiragh <sservati at yahoo.com
> wrote:

> Hi
> I want to know after webkit parses the html file where does it save the
> font that is used for text? It definitely won't save a name for the font but
> there should be some kind of index or sth to tell the rendering engine which
> font is being used.
>
> Thanks in advance
>
> *Soheil Servati Beiragh*
> *PhD Candidate, ECE Department,
> *
> *Research Center for Integrated Microsystems,*
> *University of Windsor.*
> Room 268 Essex Hall
> 401 Sunset Avenue
> Windsor, Ontario
> Canada, N9B 3P4
> Phone: 519-253-3000 Ext 3396
> Email: servati at uwindsor.ca
>
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>
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