void HarfBuzzShaper::setGlyphPositionsForHarfBuzzRun(HarfBuzzRun* currentRun, hb_buffer_t* harfBuzzBuffer)
{
const SimpleFontData* currentFontData = currentRun->fontData();
hb_glyph_info_t* glyphInfos = hb_buffer_get_glyph_infos(harfBuzzBuffer, 0);
hb_glyph_position_t* glyphPositions = hb_buffer_get_glyph_positions(harfBuzzBuffer, 0);
unsigned numGlyphs = currentRun->numGlyphs();
uint16_t* glyphToCharacterIndexes = currentRun->glyphToCharacterIndexes();
float totalAdvance = 0;
// HarfBuzz returns the shaping result in visual order. We need not to flip for RTL.
for (size_t i = 0; i < numGlyphs; ++i) {
bool runEnd = i + 1 == numGlyphs;
uint16_t glyph = glyphInfos[i].codepoint;
float offsetX = harfBuzzPositionToFloat(glyphPositions[i].x_offset);
float offsetY = -harfBuzzPositionToFloat(glyphPositions[i].y_offset);
float advance = harfBuzzPositionToFloat(glyphPositions[i].x_advance);
unsigned currentCharacterIndex = currentRun->startIndex() + glyphInfos[i].cluster;
bool isClusterEnd = runEnd || glyphInfos[i].cluster != glyphInfos[i + 1].cluster;
float spacing = 0;
glyphToCharacterIndexes[i] = glyphInfos[i].cluster;
if (isClusterEnd && !Font::treatAsZeroWidthSpace(m_normalizedBuffer[currentCharacterIndex]))
spacing += m_letterSpacing;
if (isClusterEnd && isWordEnd(currentCharacterIndex))
spacing += determineWordBreakSpacing();
if (currentFontData->isZeroWidthSpaceGlyph(glyph)) {
currentRun->setGlyphAndPositions(i, glyph, 0, 0, 0);
continue;
}
advance += spacing;
if (m_run.rtl()) {
// In RTL, spacing should be added to left side of glyphs.
offsetX += spacing;
if (!isClusterEnd)
offsetX += m_letterSpacing;
}
currentRun->setGlyphAndPositions(i, glyph, advance, offsetX, offsetY);
totalAdvance += advance;
}
currentRun->setWidth(totalAdvance > 0.0 ? totalAdvance : 0.0);
m_totalWidth += currentRun->width();
}
// TODO crbug.com/542701: This should be a method on ShapeResult.
void HarfBuzzShaper::insertRunIntoShapeResult(ShapeResult* result,
PassOwnPtr<ShapeResult::RunInfo> runToInsert, unsigned startGlyph, unsigned numGlyphs,
hb_buffer_t* harfBuzzBuffer)
{
ASSERT(numGlyphs > 0);
OwnPtr<ShapeResult::RunInfo> run(std::move(runToInsert));
ASSERT(numGlyphs == run->m_glyphData.size());
const SimpleFontData* currentFontData = run->m_fontData.get();
const hb_glyph_info_t* glyphInfos = hb_buffer_get_glyph_infos(harfBuzzBuffer, 0);
const hb_glyph_position_t* glyphPositions = hb_buffer_get_glyph_positions(harfBuzzBuffer, 0);
const unsigned startCluster = HB_DIRECTION_IS_FORWARD(hb_buffer_get_direction(harfBuzzBuffer))
? glyphInfos[startGlyph].cluster : glyphInfos[startGlyph + numGlyphs - 1].cluster;
float totalAdvance = 0.0f;
FloatPoint glyphOrigin;
bool hasVerticalOffsets = !HB_DIRECTION_IS_HORIZONTAL(run->m_direction);
// HarfBuzz returns result in visual order, no need to flip for RTL.
for (unsigned i = 0; i < numGlyphs; ++i) {
uint16_t glyph = glyphInfos[startGlyph + i].codepoint;
float offsetX = harfBuzzPositionToFloat(glyphPositions[startGlyph + i].x_offset);
float offsetY = -harfBuzzPositionToFloat(glyphPositions[startGlyph + i].y_offset);
// One out of x_advance and y_advance is zero, depending on
// whether the buffer direction is horizontal or vertical.
float advance = harfBuzzPositionToFloat(glyphPositions[startGlyph + i].x_advance - glyphPositions[startGlyph + i].y_advance);
RELEASE_ASSERT(m_normalizedBufferLength > glyphInfos[startGlyph + i].cluster);
// The characterIndex of one ShapeResult run is normalized to the run's
// startIndex and length. TODO crbug.com/542703: Consider changing that
// and instead pass the whole run to hb_buffer_t each time.
run->m_glyphData[i].characterIndex = glyphInfos[startGlyph + i].cluster - startCluster;
run->setGlyphAndPositions(i, glyph, advance, offsetX, offsetY);
totalAdvance += advance;
hasVerticalOffsets |= (offsetY != 0);
FloatRect glyphBounds = currentFontData->boundsForGlyph(glyph);
glyphBounds.move(glyphOrigin.x(), glyphOrigin.y());
result->m_glyphBoundingBox.unite(glyphBounds);
glyphOrigin += FloatSize(advance + offsetX, offsetY);
}
run->m_width = std::max(0.0f, totalAdvance);
result->m_width += run->m_width;
result->m_numGlyphs += numGlyphs;
ASSERT(result->m_numGlyphs >= numGlyphs); // no overflow
result->m_hasVerticalOffsets |= hasVerticalOffsets;
// The runs are stored in result->m_runs in visual order. For LTR, we place
// the run to be inserted before the next run with a bigger character
// start index. For RTL, we place the run before the next run with a lower
// character index. Otherwise, for both directions, at the end.
if (HB_DIRECTION_IS_FORWARD(run->m_direction)) {
for (size_t pos = 0; pos < result->m_runs.size(); ++pos) {
if (result->m_runs.at(pos)->m_startIndex > run->m_startIndex) {
result->m_runs.insert(pos, run.release());
break;
}
}
} else {
for (size_t pos = 0; pos < result->m_runs.size(); ++pos) {
if (result->m_runs.at(pos)->m_startIndex < run->m_startIndex) {
result->m_runs.insert(pos, run.release());
break;
}
}
}
// If we didn't find an existing slot to place it, append.
if (run) {
result->m_runs.append(run.release());
}
}
void ShapeResult::insertRun(std::unique_ptr<ShapeResult::RunInfo> runToInsert,
unsigned startGlyph,
unsigned numGlyphs,
hb_buffer_t* harfBuzzBuffer) {
ASSERT(numGlyphs > 0);
std::unique_ptr<ShapeResult::RunInfo> run(std::move(runToInsert));
ASSERT(numGlyphs == run->m_glyphData.size());
const SimpleFontData* currentFontData = run->m_fontData.get();
const hb_glyph_info_t* glyphInfos =
hb_buffer_get_glyph_infos(harfBuzzBuffer, 0);
const hb_glyph_position_t* glyphPositions =
hb_buffer_get_glyph_positions(harfBuzzBuffer, 0);
const unsigned startCluster =
HB_DIRECTION_IS_FORWARD(hb_buffer_get_direction(harfBuzzBuffer))
? glyphInfos[startGlyph].cluster
: glyphInfos[startGlyph + numGlyphs - 1].cluster;
float totalAdvance = 0.0f;
FloatPoint glyphOrigin;
bool hasVerticalOffsets = !HB_DIRECTION_IS_HORIZONTAL(run->m_direction);
// HarfBuzz returns result in visual order, no need to flip for RTL.
for (unsigned i = 0; i < numGlyphs; ++i) {
uint16_t glyph = glyphInfos[startGlyph + i].codepoint;
hb_glyph_position_t pos = glyphPositions[startGlyph + i];
float offsetX = harfBuzzPositionToFloat(pos.x_offset);
float offsetY = -harfBuzzPositionToFloat(pos.y_offset);
// One out of x_advance and y_advance is zero, depending on
// whether the buffer direction is horizontal or vertical.
// Convert to float and negate to avoid integer-overflow for ULONG_MAX.
float advance;
if (LIKELY(pos.x_advance))
advance = harfBuzzPositionToFloat(pos.x_advance);
else
advance = -harfBuzzPositionToFloat(pos.y_advance);
run->m_glyphData[i].characterIndex =
glyphInfos[startGlyph + i].cluster - startCluster;
run->setGlyphAndPositions(i, glyph, advance, offsetX, offsetY);
totalAdvance += advance;
hasVerticalOffsets |= (offsetY != 0);
FloatRect glyphBounds = currentFontData->boundsForGlyph(glyph);
glyphBounds.move(glyphOrigin.x(), glyphOrigin.y());
m_glyphBoundingBox.unite(glyphBounds);
glyphOrigin += FloatSize(advance + offsetX, offsetY);
}
run->m_width = std::max(0.0f, totalAdvance);
m_width += run->m_width;
m_numGlyphs += numGlyphs;
ASSERT(m_numGlyphs >= numGlyphs);
m_hasVerticalOffsets |= hasVerticalOffsets;
// The runs are stored in result->m_runs in visual order. For LTR, we place
// the run to be inserted before the next run with a bigger character
// start index. For RTL, we place the run before the next run with a lower
// character index. Otherwise, for both directions, at the end.
if (HB_DIRECTION_IS_FORWARD(run->m_direction)) {
for (size_t pos = 0; pos < m_runs.size(); ++pos) {
if (m_runs.at(pos)->m_startIndex > run->m_startIndex) {
m_runs.insert(pos, std::move(run));
break;
}
}
} else {
for (size_t pos = 0; pos < m_runs.size(); ++pos) {
if (m_runs.at(pos)->m_startIndex < run->m_startIndex) {
m_runs.insert(pos, std::move(run));
break;
}
}
}
// If we didn't find an existing slot to place it, append.
if (run)
m_runs.append(std::move(run));
}