third_party/WebKit/Source/core/css/CSSFontFaceSource.cpp

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#include "core/css/CSSFontFaceSource.h"

#include "core/css/CSSFontFace.h"
#include "platform/fonts/FontCacheKey.h"
#include "platform/fonts/FontDescription.h"
#include "platform/fonts/FontFaceCreationParams.h"
#include "platform/fonts/SimpleFontData.h"

namespace blink {

CSSFontFaceSource::CSSFontFaceSource() : m_face(nullptr) {}

CSSFontFaceSource::~CSSFontFaceSource() {}

PassRefPtr<SimpleFontData> CSSFontFaceSource::getFontData(
    const FontDescription& fontDescription) {
  // If the font hasn't loaded or an error occurred, then we've got nothing.
  if (!isValid())
    return nullptr;

  if (isLocal()) {
    // We're local. Just return a SimpleFontData from the normal cache.
    return createFontData(fontDescription);
  }

  // See if we have a mapping in our FontData cache.
  // TODO(drott): Check whether losing traits information here is problematic.
  // crbug.com/516677
  FontCacheKey key = fontDescription.cacheKey(FontFaceCreationParams());

  RefPtr<SimpleFontData>& fontData =
      m_fontDataTable.add(key, nullptr).storedValue->value;
  if (!fontData)
    fontData = createFontData(fontDescription);
  // No release, because fontData is a reference to a RefPtr that is held in the
  // m_fontDataTable.
  return fontData;
}

DEFINE_TRACE(CSSFontFaceSource) {
  visitor->trace(m_face);
}

}  // namespace blink