/**
* takes a utf16 string and runs Harfbuzz to create a list of glyphs
*
* @param aContext void context
* @param aUtf16String the utf16 string
* @param aHarfBuzz structure containing Harfbuzz stuff
* @return error
*/
static int Utf16_To_Harfbuzz( void *aContext,
uint16_t *aUtf16String,
int nChars,
HarfBuzz_t *aHarfBuzz ) {
ft_Context_t *ftContext = FT_CONTEXT( aContext );
HB_FontRec hbFont;
HB_Face hbFace = NULL;
HB_ShaperItem hbShaperItem;
memset( aHarfBuzz->str, 0, sizeof( aHarfBuzz->str ) );
memset( aHarfBuzz->out_glyphs, 0, sizeof( aHarfBuzz->out_glyphs ) );
memset( aHarfBuzz->out_attrs, 0, sizeof( aHarfBuzz->out_attrs ) );
memset( aHarfBuzz->out_advs, 0, sizeof( aHarfBuzz->out_advs ) );
memset( aHarfBuzz->out_offsets, 0, sizeof( aHarfBuzz->out_offsets ) );
memset( aHarfBuzz->out_logClusters, 0, sizeof( aHarfBuzz->out_logClusters ) );
memset( &hbFont, 0, sizeof( HB_FontRec ) );
memset( &hbFace, 0, sizeof( HB_Face ) );
hbFace = HB_NewFace( ftContext->m_face, hb_freetype_table_sfnt_get );
memcpy( aHarfBuzz->str, aUtf16String, nChars * sizeof( uint16_t ) );
aHarfBuzz->n_Chars = nChars;
assert( ftContext->m_face != NULL );
hbFont.klass = &hb_freetype_class;
hbFont.userData = ftContext->m_face;
hbFont.x_ppem = ftContext->m_face->size->metrics.x_ppem;
hbFont.y_ppem = ftContext->m_face->size->metrics.y_ppem;
hbFont.x_scale = ftContext->m_face->size->metrics.x_scale;
hbFont.y_scale = ftContext->m_face->size->metrics.y_scale;
memset( &hbShaperItem, 0, sizeof( HB_ShaperItem ) );
hbShaperItem.kerning_applied = FALSE;
hbShaperItem.string = ( HB_UChar16 * )aHarfBuzz->str;
hbShaperItem.stringLength = nChars;
hbShaperItem.item.bidiLevel = 0;
hbShaperItem.item.script = HB_Script_Arabic;
hbShaperItem.item.pos = 0;
hbShaperItem.item.length = hbShaperItem.stringLength;
hbShaperItem.shaperFlags = 0;
hbShaperItem.font = &hbFont;
hbShaperItem.face = hbFace;
hbShaperItem.glyphIndicesPresent = FALSE;
hbShaperItem.initialGlyphCount = 0;
hbShaperItem.glyphs = aHarfBuzz->out_glyphs;
hbShaperItem.attributes = aHarfBuzz->out_attrs;
hbShaperItem.advances = aHarfBuzz->out_advs;
hbShaperItem.offsets = aHarfBuzz->out_offsets;
hbShaperItem.log_clusters = aHarfBuzz->out_logClusters;
hbShaperItem.num_glyphs = MAX_CHARS;
HB_ShapeItem( &hbShaperItem );
HB_FreeFace( hbFace );
return 0;
}
~TextRunWalker()
{
fastFree(m_item.font);
deleteGlyphArrays();
delete[] m_item.log_clusters;
if (m_item.face)
HB_FreeFace(m_item.face);
}
void setupFontForScriptRun()
{
const FontData* fontData = m_font->fontDataAt(0);
if (!fontData->containsCharacters(m_item.string + m_item.item.pos, m_item.item.length))
fontData = m_font->fontDataForCharacters(m_item.string + m_item.item.pos, m_item.item.length);
const FontPlatformData& platformData = fontData->fontDataForCharacter(' ')->platformData();
void* opaquePlatformData = const_cast<FontPlatformData*>(&platformData);
m_item.font->userData = opaquePlatformData;
if (m_item.face)
HB_FreeFace(m_item.face);
m_item.face = HB_NewFace(opaquePlatformData, harfbuzzSkiaGetTable);
}
Shaper::Shaper(FT_Face face, HB_Script script, const QString &str)
{
HB_Face hbFace = HB_NewFace(face, hb_getSFntTable);
hbFont.klass = &hb_fontClass;
hbFont.userData = face;
hbFont.x_ppem = face->size->metrics.x_ppem;
hbFont.y_ppem = face->size->metrics.y_ppem;
hbFont.x_scale = face->size->metrics.x_scale;
hbFont.y_scale = face->size->metrics.y_scale;
shaper_item.kerning_applied = false;
shaper_item.string = reinterpret_cast<const HB_UChar16 *>(str.constData());
shaper_item.stringLength = str.length();
shaper_item.item.script = script;
shaper_item.item.pos = 0;
shaper_item.item.length = shaper_item.stringLength;
shaper_item.item.bidiLevel = 0; // ###
shaper_item.shaperFlags = 0;
shaper_item.font = &hbFont;
shaper_item.face = hbFace;
shaper_item.num_glyphs = shaper_item.item.length;
shaper_item.glyphIndicesPresent = false;
shaper_item.initialGlyphCount = 0;
while (1) {
hb_glyphs.resize(shaper_item.num_glyphs);
hb_attributes.resize(shaper_item.num_glyphs);
hb_advances.resize(shaper_item.num_glyphs);
hb_offsets.resize(shaper_item.num_glyphs);
hb_logClusters.resize(shaper_item.num_glyphs);
memset(hb_glyphs.data(), 0, hb_glyphs.size() * sizeof(HB_Glyph));
memset(hb_attributes.data(), 0, hb_attributes.size() * sizeof(HB_GlyphAttributes));
memset(hb_advances.data(), 0, hb_advances.size() * sizeof(HB_Fixed));
memset(hb_offsets.data(), 0, hb_offsets.size() * sizeof(HB_FixedPoint));
shaper_item.glyphs = hb_glyphs.data();
shaper_item.attributes = hb_attributes.data();
shaper_item.advances = hb_advances.data();
shaper_item.offsets = hb_offsets.data();
shaper_item.log_clusters = hb_logClusters.data();
if (HB_ShapeItem(&shaper_item))
break;
}
HB_FreeFace(hbFace);
}
FMShaper::~ FMShaper()
{
qDebug() << "FMShaper "<< this <<" destructor";
if (faceisset)
{
if(m.font)
{
qDebug() << "Freeing m.font at "<< m.font;
delete m.font;
}
if(m.face)
{
qDebug() << "Freeing m.face at "<< m.face;
HB_FreeFace(m.face);
}
}
qDebug() << "FMShaper "<< this <<" destroyed";
}
void qHBFreeFace(HB_Face face)
{
HB_FreeFace(face);
}
FontPlatformData::RefCountedHarfbuzzFace::~RefCountedHarfbuzzFace()
{
HB_FreeFace(m_harfbuzzFace);
}
FontPlatformData::RefCountedHarfbuzzFace::~RefCountedHarfbuzzFace()
{
#ifdef SUPPORT_COMPLEX_SCRIPTS
HB_FreeFace(m_harfbuzzFace);
#endif
}
