cluster_t *GraphiteLayoutShaper::getCluster(gr_segment *segment, size_t numCodePoints) {
const gr_slot *is;
int ic, ci = 0;
cluster_t *clusters = (cluster_t *) malloc(numCodePoints * sizeof(cluster_t));
memset(clusters, 0, numCodePoints * sizeof(cluster_t));
for (is = gr_seg_first_slot(segment), ic = 0; is; is = gr_slot_next_in_segment(is), ic++) {
unsigned int before = gr_slot_before(is);
unsigned int after = gr_slot_after(is);
while (clusters[ci].base_char > before && ci) {
clusters[ci - 1].num_chars += clusters[ci].num_chars;
clusters[ci - 1].num_glyphs += clusters[ci].num_glyphs;
--ci;
}
if (gr_slot_can_insert_before(is) && clusters[ci].num_chars
&& before >= clusters[ci].base_char + clusters[ci].num_chars) {
cluster_t *c = clusters + ci + 1;
c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
c->num_chars = before - c->base_char;
c->base_glyph = ic;
c->num_glyphs = 0;
++ci;
}
++clusters[ci].num_glyphs;
if (clusters[ci].base_char + clusters[ci].num_chars < after + 1) {
clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
}
}
return clusters;
}
bool
initGraphiteBreaking(XeTeXLayoutEngine engine, const uint16_t* txtPtr, int txtLen)
{
hb_face_t* hbFace = hb_font_get_face(engine->font->getHbFont());
gr_face* grFace = hb_graphite2_face_get_gr_face(hbFace);
gr_font* grFont = hb_graphite2_font_get_gr_font(engine->font->getHbFont());
if (grFace != NULL && grFont != NULL) {
if (grSegment != NULL) {
gr_seg_destroy(grSegment);
grSegment = NULL;
grPrevSlot = NULL;
}
gr_feature_val *grFeatureValues = gr_face_featureval_for_lang (grFace, tag_from_lang(engine->language));
int nFeatures = engine->nFeatures;
hb_feature_t *features = engine->features;
while (nFeatures--) {
const gr_feature_ref *fref = gr_face_find_fref (grFace, features->tag);
if (fref)
gr_fref_set_feature_value (fref, features->value, grFeatureValues);
features++;
}
grSegment = gr_make_seg(grFont, grFace, engine->script, grFeatureValues, gr_utf16, txtPtr, txtLen, 0);
grPrevSlot = gr_seg_first_slot(grSegment);
grTextLen = txtLen;
return true;
}
return false;
}
jfloat GraphiteLayoutShaper::shapeScriptRun(const SkPaint* paint, const UChar* chars,
size_t count, bool isRTL, Vector<jfloat>* const outAdvances,
Vector<jchar>* const outGlyphs, Vector<jfloat>* const outPos,
jfloat startXPosition, uint32_t startScriptRun, size_t glyphBaseCount) {
ALOGD("Shape Scrit Run with Graphite");
SkTypeface *typeface = paint->getTypeface();
mShapingGrFace = getCachedGrFace(typeface);
unsigned int x_ppem;
unsigned int y_ppem;
int x_scale;
int y_scale;
getConversionFactor(x_ppem, y_ppem, x_scale, y_scale, paint);
mShapingGrFont = gr_make_font_with_ops(x_ppem, paint, &GraphiteFontOps, mShapingGrFace);
const uint16_t *charsScriptStart = chars ;
const uint16_t *charsScriptEnd = chars + count;
size_t numCP;
char *pError;
numCP = gr_count_unicode_characters(gr_utf16, charsScriptStart, charsScriptEnd, (const void **)(&pError));
#if DEBUG_GLYPHS
ALOGD("Myanmar shape with Graphite, numCP = %d, grFont = %p, grFace = %p, pError = %p",
numCP, mShapingGrFont, mShapingGrFace, pError);
#endif
if(!mShapingGrFont || !mShapingGrFace || pError) {
ALOGD("Invalid grFont is NULL, grFace is NULL or parse string error.");
return 0.0;
}
mShapingSegment = gr_make_seg(mShapingGrFont, mShapingGrFace, 0, 0,
gr_utf16, charsScriptStart, numCP, isRTL);
cluster_t *clusters = getCluster(mShapingSegment, numCP);
#if DEBUG_GLYPHS
ALOGD("Got from Graphite");
#endif
const gr_slot *slot;
size_t glyphIndex, clusterIndex = 0;
jfloat totalFontRunAdvance = 0;
for (slot = gr_seg_first_slot(mShapingSegment), glyphIndex = 0; slot;
slot = gr_slot_next_in_segment(slot), ++ glyphIndex) {
#if DEBUG_GLYPHS
ALOGD(" -- Glyph = %d, origin = (%f, %f), advance = (%f, %f)\n",
gr_slot_gid(slot), gr_slot_origin_X(slot),
gr_slot_origin_Y(slot),
gr_slot_advance_X(slot, mShapingGrFace, mShapingGrFont),
gr_slot_advance_Y(slot, mShapingGrFace, mShapingGrFont));
#endif
if(glyphIndex == clusters[clusterIndex].base_glyph + clusters[clusterIndex].num_glyphs) {
uint32_t clusterStart = clusters[clusterIndex].base_char + startScriptRun;
jfloat startOrigin = outAdvances->itemAt(clusterStart);
jfloat advance = gr_slot_origin_X(slot) - startOrigin;
outAdvances->replaceAt(advance, clusterStart);
++ clusterIndex;
clusterStart = clusters[clusterIndex].base_char + startScriptRun;
outAdvances->replaceAt(gr_slot_origin_X(slot), clusterStart);
}
jfloat charRight = gr_slot_origin_X(slot) + gr_slot_advance_X(slot, mShapingGrFace, mShapingGrFont);
if (charRight > totalFontRunAdvance) {
totalFontRunAdvance = charRight;
}
jchar glyph = glyphBaseCount + gr_slot_gid(slot);
outGlyphs->add(glyph);
outPos->add(startXPosition + gr_slot_origin_X(slot));
outPos->add(gr_slot_origin_Y(slot));
}
uint32_t clusterStart = clusters[clusterIndex].base_char + startScriptRun;
jfloat startOrigin = outAdvances->itemAt(clusterStart);
jfloat advance = totalFontRunAdvance - startOrigin;
outAdvances->replaceAt(advance, clusterStart);
if(mShapingSegment) {
gr_seg_destroy(mShapingSegment);
mShapingSegment = NULL;
}
if(mShapingGrFont) {
gr_font_destroy(mShapingGrFont);
mShapingGrFont = NULL;
}
#if DEBUG_GLYPHS
ALOGD(" -- totalFontRunAdvance = %f", totalFontRunAdvance);
#endif
return totalFontRunAdvance;
}