third_party/WebKit/Source/platform/fonts/FontCustomPlatformData.cpp

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#include "platform/fonts/FontCustomPlatformData.h"

#include "platform/LayoutTestSupport.h"
#include "platform/SharedBuffer.h"
#include "platform/fonts/FontCache.h"
#include "platform/fonts/FontPlatformData.h"
#include "platform/fonts/WebFontDecoder.h"
#include "platform/fonts/opentype/FontSettings.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkTypeface.h"
#include "wtf/PtrUtil.h"

namespace blink {

FontCustomPlatformData::FontCustomPlatformData(sk_sp<SkTypeface> typeface,
                                               size_t dataSize)
    : m_baseTypeface(typeface), m_dataSize(dataSize) {}

FontCustomPlatformData::~FontCustomPlatformData() {}

FontPlatformData FontCustomPlatformData::fontPlatformData(
    float size,
    bool bold,
    bool italic,
    FontOrientation orientation,
    const FontVariationSettings* variationSettings) {
  DCHECK(m_baseTypeface);

  sk_sp<SkTypeface> returnTypeface = m_baseTypeface;

  // Maximum axis count is maximum value for the OpenType USHORT, which is a
  // 16bit unsigned.  https://www.microsoft.com/typography/otspec/fvar.htm
  // Variation settings coming from CSS can have duplicate assignments and the
  // list can be longer than UINT16_MAX, but ignoring this for now, going with a
  // reasonable upper limit and leaving the deduplication for TODO(drott),
  // crbug.com/674878 second duplicate value should supersede first..
  if (variationSettings && variationSettings->size() < UINT16_MAX) {
    sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
    Vector<SkFontMgr::FontParameters::Axis, 0> axes;
    axes.reserveCapacity(variationSettings->size());
    for (size_t i = 0; i < variationSettings->size(); ++i) {
      SkFontMgr::FontParameters::Axis axis = {
          atomicStringToFourByteTag(variationSettings->at(i).tag()),
          SkFloatToScalar(variationSettings->at(i).value())};
      axes.push_back(axis);
    }

    sk_sp<SkTypeface> skVariationFont(fm->createFromStream(
        m_baseTypeface->openStream(nullptr)->duplicate(),
        SkFontMgr::FontParameters().setAxes(axes.data(), axes.size())));

    if (skVariationFont) {
      returnTypeface = skVariationFont;
    } else {
      SkString familyName;
      m_baseTypeface->getFamilyName(&familyName);
      // TODO: Surface this as a console message?
      LOG(ERROR) << "Unable for apply variation axis properties for font: "
                 << familyName.c_str();
    }
  }

  return FontPlatformData(returnTypeface, "", size,
                          bold && !m_baseTypeface->isBold(),
                          italic && !m_baseTypeface->isItalic(), orientation);
}

PassRefPtr<FontCustomPlatformData> FontCustomPlatformData::create(
    SharedBuffer* buffer,
    String& otsParseMessage) {
  DCHECK(buffer);
  WebFontDecoder decoder;
  sk_sp<SkTypeface> typeface = decoder.decode(buffer);
  if (!typeface) {
    otsParseMessage = decoder.getErrorString();
    return nullptr;
  }
  return adoptRef(
      new FontCustomPlatformData(std::move(typeface), decoder.decodedSize()));
}

bool FontCustomPlatformData::supportsFormat(const String& format) {
  return equalIgnoringCase(format, "truetype") ||
         equalIgnoringCase(format, "opentype") ||
         WebFontDecoder::supportsFormat(format);
}

}  // namespace blink