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/*
* Copyright (c) 2012 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
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* 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 "HarfBuzzNGFace.h"
#include "FontPlatformData.h"
#include "hb-ot.h"
#include "hb.h"
namespace WebCore {
const hb_tag_t HarfBuzzNGFace::vertTag = HB_TAG('v', 'e', 'r', 't');
const hb_tag_t HarfBuzzNGFace::vrt2Tag = HB_TAG('v', 'r', 't', '2');
// Though we have FontCache class, which provides the cache mechanism for
// WebKit's font objects, we also need additional caching layer for HarfBuzz
// to reduce the memory consumption because hb_face_t should be associated with
// underling font data (e.g. CTFontRef, FTFace).
class FaceCacheEntry : public RefCounted<FaceCacheEntry> {
public:
static PassRefPtr<FaceCacheEntry> create(hb_face_t* face)
{
ASSERT(face);
return adoptRef(new FaceCacheEntry(face));
}
~FaceCacheEntry()
{
hb_face_destroy(m_face);
}
hb_face_t* face() { return m_face; }
HashMap<uint32_t, uint16_t>* glyphCache() { return &m_glyphCache; }
private:
explicit FaceCacheEntry(hb_face_t* face)
: m_face(face)
{ }
hb_face_t* m_face;
HashMap<uint32_t, uint16_t> m_glyphCache;
};
typedef HashMap<uint64_t, RefPtr<FaceCacheEntry>, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t> > HarfBuzzNGFaceCache;
static HarfBuzzNGFaceCache* harfbuzzFaceCache()
{
DEFINE_STATIC_LOCAL(HarfBuzzNGFaceCache, s_harfbuzzFaceCache, ());
return &s_harfbuzzFaceCache;
}
HarfBuzzNGFace::HarfBuzzNGFace(FontPlatformData* platformData, uint64_t uniqueID)
: m_platformData(platformData)
, m_uniqueID(uniqueID)
, m_scriptForVerticalText(HB_SCRIPT_INVALID)
{
HarfBuzzNGFaceCache::AddResult result = harfbuzzFaceCache()->add(m_uniqueID, 0);
if (result.isNewEntry)
result.iterator->value = FaceCacheEntry::create(createFace());
result.iterator->value->ref();
m_face = result.iterator->value->face();
m_glyphCacheForFaceCacheEntry = result.iterator->value->glyphCache();
}
HarfBuzzNGFace::~HarfBuzzNGFace()
{
HarfBuzzNGFaceCache::iterator result = harfbuzzFaceCache()->find(m_uniqueID);
ASSERT(result != harfbuzzFaceCache()->end());
ASSERT(result.get()->value->refCount() > 1);
result.get()->value->deref();
if (result.get()->value->refCount() == 1)
harfbuzzFaceCache()->remove(m_uniqueID);
}
static hb_script_t findScriptForVerticalGlyphSubstitution(hb_face_t* face)
{
static const unsigned maxCount = 32;
unsigned scriptCount = maxCount;
hb_tag_t scriptTags[maxCount];
hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, 0, &scriptCount, scriptTags);
for (unsigned scriptIndex = 0; scriptIndex < scriptCount; ++scriptIndex) {
unsigned languageCount = maxCount;
hb_tag_t languageTags[maxCount];
hb_ot_layout_script_get_language_tags(face, HB_OT_TAG_GSUB, scriptIndex, 0, &languageCount, languageTags);
for (unsigned languageIndex = 0; languageIndex < languageCount; ++languageIndex) {
unsigned featureIndex;
if (hb_ot_layout_language_find_feature(face, HB_OT_TAG_GSUB, scriptIndex, languageIndex, HarfBuzzNGFace::vertTag, &featureIndex)
|| hb_ot_layout_language_find_feature(face, HB_OT_TAG_GSUB, scriptIndex, languageIndex, HarfBuzzNGFace::vrt2Tag, &featureIndex))
return hb_ot_tag_to_script(scriptTags[scriptIndex]);
}
}
return HB_SCRIPT_INVALID;
}
void HarfBuzzNGFace::setScriptForVerticalGlyphSubstitution(hb_buffer_t* buffer)
{
if (m_scriptForVerticalText == HB_SCRIPT_INVALID)
m_scriptForVerticalText = findScriptForVerticalGlyphSubstitution(m_face);
hb_buffer_set_script(buffer, m_scriptForVerticalText);
}
} // namespace WebCore
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