| /* |
| * 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 "HarfBuzzShaper.h" |
| |
| #include "Font.h" |
| #include "HarfBuzzFace.h" |
| #include "SurrogatePairAwareTextIterator.h" |
| #include "TextRun.h" |
| #include "hb-icu.h" |
| #include <unicode/normlzr.h> |
| #include <unicode/uchar.h> |
| #include <wtf/MathExtras.h> |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/Vector.h> |
| #include <wtf/unicode/Unicode.h> |
| |
| namespace WebCore { |
| |
| template<typename T> |
| class HarfBuzzScopedPtr { |
| public: |
| typedef void (*DestroyFunction)(T*); |
| |
| HarfBuzzScopedPtr(T* ptr, DestroyFunction destroy) |
| : m_ptr(ptr) |
| , m_destroy(destroy) |
| { |
| ASSERT(m_destroy); |
| } |
| ~HarfBuzzScopedPtr() |
| { |
| if (m_ptr) |
| (*m_destroy)(m_ptr); |
| } |
| |
| T* get() { return m_ptr; } |
| private: |
| T* m_ptr; |
| DestroyFunction m_destroy; |
| }; |
| |
| static inline float harfBuzzPositionToFloat(hb_position_t value) |
| { |
| return static_cast<float>(value) / (1 << 16); |
| } |
| |
| HarfBuzzShaper::HarfBuzzRun::HarfBuzzRun(const SimpleFontData* fontData, unsigned startIndex, unsigned numCharacters, TextDirection direction, hb_script_t script) |
| : m_fontData(fontData) |
| , m_startIndex(startIndex) |
| , m_numCharacters(numCharacters) |
| , m_direction(direction) |
| , m_script(script) |
| { |
| } |
| |
| void HarfBuzzShaper::HarfBuzzRun::applyShapeResult(hb_buffer_t* harfBuzzBuffer) |
| { |
| m_numGlyphs = hb_buffer_get_length(harfBuzzBuffer); |
| m_glyphs.resize(m_numGlyphs); |
| m_advances.resize(m_numGlyphs); |
| m_glyphToCharacterIndexes.resize(m_numGlyphs); |
| m_offsets.resize(m_numGlyphs); |
| } |
| |
| void HarfBuzzShaper::HarfBuzzRun::setGlyphAndPositions(unsigned index, uint16_t glyphId, float advance, float offsetX, float offsetY) |
| { |
| m_glyphs[index] = glyphId; |
| m_advances[index] = advance; |
| m_offsets[index] = FloatPoint(offsetX, offsetY); |
| } |
| |
| int HarfBuzzShaper::HarfBuzzRun::characterIndexForXPosition(float targetX) |
| { |
| ASSERT(targetX <= m_width); |
| float currentX = 0; |
| float currentAdvance = m_advances[0]; |
| unsigned glyphIndex = 0; |
| |
| // Sum up advances that belong to a character. |
| while (glyphIndex < m_numGlyphs - 1 && m_glyphToCharacterIndexes[glyphIndex] == m_glyphToCharacterIndexes[glyphIndex + 1]) |
| currentAdvance += m_advances[++glyphIndex]; |
| currentAdvance = currentAdvance / 2.0; |
| if (targetX <= currentAdvance) |
| return rtl() ? m_numCharacters : 0; |
| |
| ++glyphIndex; |
| while (glyphIndex < m_numGlyphs) { |
| unsigned prevCharacterIndex = m_glyphToCharacterIndexes[glyphIndex - 1]; |
| float prevAdvance = currentAdvance; |
| currentAdvance = m_advances[glyphIndex]; |
| while (glyphIndex < m_numGlyphs - 1 && m_glyphToCharacterIndexes[glyphIndex] == m_glyphToCharacterIndexes[glyphIndex + 1]) |
| currentAdvance += m_advances[++glyphIndex]; |
| currentAdvance = currentAdvance / 2.0; |
| float nextX = currentX + prevAdvance + currentAdvance; |
| if (currentX <= targetX && targetX <= nextX) |
| return rtl() ? prevCharacterIndex : m_glyphToCharacterIndexes[glyphIndex]; |
| currentX = nextX; |
| prevAdvance = currentAdvance; |
| ++glyphIndex; |
| } |
| |
| return rtl() ? 0 : m_numCharacters; |
| } |
| |
| float HarfBuzzShaper::HarfBuzzRun::xPositionForOffset(unsigned offset) |
| { |
| ASSERT(offset < m_numCharacters); |
| unsigned glyphIndex = 0; |
| float position = 0; |
| if (rtl()) { |
| while (glyphIndex < m_numGlyphs && m_glyphToCharacterIndexes[glyphIndex] > offset) { |
| position += m_advances[glyphIndex]; |
| ++glyphIndex; |
| } |
| // For RTL, we need to return the right side boundary of the character. |
| // Add advance of glyphs which are part of the character. |
| while (glyphIndex < m_numGlyphs - 1 && m_glyphToCharacterIndexes[glyphIndex] == m_glyphToCharacterIndexes[glyphIndex + 1]) { |
| position += m_advances[glyphIndex]; |
| ++glyphIndex; |
| } |
| position += m_advances[glyphIndex]; |
| } else { |
| while (glyphIndex < m_numGlyphs && m_glyphToCharacterIndexes[glyphIndex] < offset) { |
| position += m_advances[glyphIndex]; |
| ++glyphIndex; |
| } |
| } |
| return position; |
| } |
| |
| static void normalizeCharacters(const TextRun& run, UChar* destination, int length) |
| { |
| int position = 0; |
| bool error = false; |
| const UChar* source; |
| String stringFor8BitRun; |
| if (run.is8Bit()) { |
| stringFor8BitRun = String::make16BitFrom8BitSource(run.characters8(), run.length()); |
| source = stringFor8BitRun.characters16(); |
| } else |
| source = run.characters16(); |
| |
| while (position < length) { |
| UChar32 character; |
| int nextPosition = position; |
| U16_NEXT(source, nextPosition, length, character); |
| // Don't normalize tabs as they are not treated as spaces for word-end. |
| if (Font::treatAsSpace(character) && character != '\t') |
| character = ' '; |
| else if (Font::treatAsZeroWidthSpaceInComplexScript(character)) |
| character = zeroWidthSpace; |
| U16_APPEND(destination, position, length, character, error); |
| ASSERT_UNUSED(error, !error); |
| position = nextPosition; |
| } |
| } |
| |
| HarfBuzzShaper::HarfBuzzShaper(const Font* font, const TextRun& run) |
| : m_font(font) |
| , m_normalizedBufferLength(0) |
| , m_run(run) |
| , m_wordSpacingAdjustment(font->wordSpacing()) |
| , m_padding(0) |
| , m_padPerWordBreak(0) |
| , m_padError(0) |
| , m_letterSpacing(font->letterSpacing()) |
| , m_fromIndex(0) |
| , m_toIndex(m_run.length()) |
| { |
| m_normalizedBuffer = std::make_unique<UChar[]>(m_run.length() + 1); |
| m_normalizedBufferLength = m_run.length(); |
| normalizeCharacters(m_run, m_normalizedBuffer.get(), m_normalizedBufferLength); |
| setPadding(m_run.expansion()); |
| setFontFeatures(); |
| } |
| |
| HarfBuzzShaper::~HarfBuzzShaper() |
| { |
| } |
| |
| static void normalizeSpacesAndMirrorChars(const UChar* source, UChar* destination, int length, HarfBuzzShaper::NormalizeMode normalizeMode) |
| { |
| int position = 0; |
| bool error = false; |
| // Iterate characters in source and mirror character if needed. |
| while (position < length) { |
| UChar32 character; |
| int nextPosition = position; |
| U16_NEXT(source, nextPosition, length, character); |
| // Don't normalize tabs as they are not treated as spaces for word-end |
| if (Font::treatAsSpace(character) && character != '\t') |
| character = ' '; |
| else if (Font::treatAsZeroWidthSpace(character)) |
| character = zeroWidthSpace; |
| else if (normalizeMode == HarfBuzzShaper::NormalizeMirrorChars) |
| character = u_charMirror(character); |
| U16_APPEND(destination, position, length, character, error); |
| ASSERT_UNUSED(error, !error); |
| position = nextPosition; |
| } |
| } |
| |
| void HarfBuzzShaper::setNormalizedBuffer(NormalizeMode normalizeMode) |
| { |
| // Normalize the text run in three ways: |
| // 1) Convert the |originalRun| to NFC normalized form if combining diacritical marks |
| // (U+0300..) are used in the run. This conversion is necessary since most OpenType |
| // fonts (e.g., Arial) don't have substitution rules for the diacritical marks in |
| // their GSUB tables. |
| // |
| // Note that we don't use the icu::Normalizer::isNormalized(UNORM_NFC) API here since |
| // the API returns FALSE (= not normalized) for complex runs that don't require NFC |
| // normalization (e.g., Arabic text). Unless the run contains the diacritical marks, |
| // HarfBuzz will do the same thing for us using the GSUB table. |
| // 2) Convert spacing characters into plain spaces, as some fonts will provide glyphs |
| // for characters like '\n' otherwise. |
| // 3) Convert mirrored characters such as parenthesis for rtl text. |
| |
| // Convert to NFC form if the text has diacritical marks. |
| icu::UnicodeString normalizedString; |
| UErrorCode error = U_ZERO_ERROR; |
| |
| const UChar* runCharacters; |
| String stringFor8BitRun; |
| if (m_run.is8Bit()) { |
| stringFor8BitRun = String::make16BitFrom8BitSource(m_run.characters8(), m_run.length()); |
| runCharacters = stringFor8BitRun.characters16(); |
| } else |
| runCharacters = m_run.characters16(); |
| |
| for (int i = 0; i < m_run.length(); ++i) { |
| UChar ch = runCharacters[i]; |
| if (::ublock_getCode(ch) == UBLOCK_COMBINING_DIACRITICAL_MARKS) { |
| icu::Normalizer::normalize(icu::UnicodeString(runCharacters, |
| m_run.length()), UNORM_NFC, 0 /* no options */, |
| normalizedString, error); |
| if (U_FAILURE(error)) |
| normalizedString.remove(); |
| break; |
| } |
| } |
| |
| const UChar* sourceText; |
| if (normalizedString.isEmpty()) { |
| m_normalizedBufferLength = m_run.length(); |
| sourceText = runCharacters; |
| } else { |
| m_normalizedBufferLength = normalizedString.length(); |
| sourceText = normalizedString.getBuffer(); |
| } |
| |
| m_normalizedBuffer = std::make_unique<UChar[]>(m_normalizedBufferLength + 1); |
| normalizeSpacesAndMirrorChars(sourceText, m_normalizedBuffer.get(), m_normalizedBufferLength, normalizeMode); |
| } |
| |
| bool HarfBuzzShaper::isWordEnd(unsigned index) |
| { |
| // This could refer a high-surrogate, but should work. |
| return index && isCodepointSpace(m_normalizedBuffer[index]); |
| } |
| |
| int HarfBuzzShaper::determineWordBreakSpacing() |
| { |
| int wordBreakSpacing = m_wordSpacingAdjustment; |
| |
| if (m_padding > 0) { |
| int toPad = roundf(m_padPerWordBreak + m_padError); |
| m_padError += m_padPerWordBreak - toPad; |
| |
| if (m_padding < toPad) |
| toPad = m_padding; |
| m_padding -= toPad; |
| wordBreakSpacing += toPad; |
| } |
| return wordBreakSpacing; |
| } |
| |
| // setPadding sets a number of pixels to be distributed across the TextRun. |
| // WebKit uses this to justify text. |
| void HarfBuzzShaper::setPadding(int padding) |
| { |
| m_padding = padding; |
| m_padError = 0; |
| if (!m_padding) |
| return; |
| |
| // If we have padding to distribute, then we try to give an equal |
| // amount to each space. The last space gets the smaller amount, if |
| // any. |
| unsigned numWordEnds = 0; |
| |
| for (unsigned i = 0; i < m_normalizedBufferLength; i++) { |
| if (isWordEnd(i)) |
| numWordEnds++; |
| } |
| |
| if (numWordEnds) |
| m_padPerWordBreak = m_padding / numWordEnds; |
| else |
| m_padPerWordBreak = 0; |
| } |
| |
| |
| void HarfBuzzShaper::setDrawRange(int from, int to) |
| { |
| ASSERT_WITH_SECURITY_IMPLICATION(from >= 0); |
| ASSERT_WITH_SECURITY_IMPLICATION(to <= m_run.length()); |
| m_fromIndex = from; |
| m_toIndex = to; |
| } |
| |
| void HarfBuzzShaper::setFontFeatures() |
| { |
| const FontDescription& description = m_font->fontDescription(); |
| if (description.orientation() == Vertical) { |
| static hb_feature_t vert = { HarfBuzzFace::vertTag, 1, 0, static_cast<unsigned>(-1) }; |
| static hb_feature_t vrt2 = { HarfBuzzFace::vrt2Tag, 1, 0, static_cast<unsigned>(-1) }; |
| m_features.append(vert); |
| m_features.append(vrt2); |
| } |
| |
| hb_feature_t kerning = { HarfBuzzFace::kernTag, 0, 0, static_cast<unsigned>(-1) }; |
| switch (description.kerning()) { |
| case FontDescription::NormalKerning: |
| kerning.value = 1; |
| m_features.append(kerning); |
| break; |
| case FontDescription::NoneKerning: |
| kerning.value = 0; |
| m_features.append(kerning); |
| break; |
| case FontDescription::AutoKerning: |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| |
| FontFeatureSettings* settings = description.featureSettings(); |
| if (!settings) |
| return; |
| |
| unsigned numFeatures = settings->size(); |
| for (unsigned i = 0; i < numFeatures; ++i) { |
| hb_feature_t feature; |
| const UChar* tag = settings->at(i).tag().characters(); |
| feature.tag = HB_TAG(tag[0], tag[1], tag[2], tag[3]); |
| feature.value = settings->at(i).value(); |
| feature.start = 0; |
| feature.end = static_cast<unsigned>(-1); |
| m_features.append(feature); |
| } |
| } |
| |
| bool HarfBuzzShaper::shape(GlyphBuffer* glyphBuffer) |
| { |
| if (!collectHarfBuzzRuns()) |
| return false; |
| |
| m_totalWidth = 0; |
| // WebKit doesn't set direction when calulating widths. Leave the direction setting to |
| // HarfBuzz when we are calculating widths (except when directionalOverride() is set). |
| if (!shapeHarfBuzzRuns(glyphBuffer || m_run.directionalOverride())) |
| return false; |
| m_totalWidth = roundf(m_totalWidth); |
| |
| if (glyphBuffer && !fillGlyphBuffer(glyphBuffer)) |
| return false; |
| |
| return true; |
| } |
| |
| FloatPoint HarfBuzzShaper::adjustStartPoint(const FloatPoint& point) |
| { |
| return point + m_startOffset; |
| } |
| |
| bool HarfBuzzShaper::collectHarfBuzzRuns() |
| { |
| const UChar* normalizedBufferEnd = m_normalizedBuffer.get() + m_normalizedBufferLength; |
| SurrogatePairAwareTextIterator iterator(m_normalizedBuffer.get(), 0, m_normalizedBufferLength, m_normalizedBufferLength); |
| UChar32 character; |
| unsigned clusterLength = 0; |
| unsigned startIndexOfCurrentRun = 0; |
| if (!iterator.consume(character, clusterLength)) |
| return false; |
| |
| const SimpleFontData* nextFontData = m_font->glyphDataForCharacter(character, false).fontData; |
| UErrorCode errorCode = U_ZERO_ERROR; |
| UScriptCode nextScript = uscript_getScript(character, &errorCode); |
| if (U_FAILURE(errorCode)) |
| return false; |
| |
| do { |
| const UChar* currentCharacterPosition = iterator.characters(); |
| const SimpleFontData* currentFontData = nextFontData; |
| UScriptCode currentScript = nextScript; |
| |
| for (iterator.advance(clusterLength); iterator.consume(character, clusterLength); iterator.advance(clusterLength)) { |
| if (Font::treatAsZeroWidthSpace(character)) |
| continue; |
| |
| if (U_GET_GC_MASK(character) & U_GC_M_MASK) { |
| int markLength = clusterLength; |
| const UChar* markCharactersEnd = iterator.characters() + clusterLength; |
| while (markCharactersEnd < normalizedBufferEnd) { |
| UChar32 nextCharacter; |
| int nextCharacterLength = 0; |
| U16_NEXT(markCharactersEnd, nextCharacterLength, normalizedBufferEnd - markCharactersEnd, nextCharacter); |
| if (!(U_GET_GC_MASK(nextCharacter) & U_GC_M_MASK)) |
| break; |
| markLength += nextCharacterLength; |
| markCharactersEnd += nextCharacterLength; |
| } |
| |
| if (currentFontData->canRenderCombiningCharacterSequence(currentCharacterPosition, markCharactersEnd - currentCharacterPosition)) { |
| clusterLength = markLength; |
| continue; |
| } |
| nextFontData = m_font->glyphDataForCharacter(character, false).fontData; |
| } else |
| nextFontData = m_font->glyphDataForCharacter(character, false).fontData; |
| |
| nextScript = uscript_getScript(character, &errorCode); |
| if (U_FAILURE(errorCode)) |
| return false; |
| if ((nextFontData != currentFontData) || ((currentScript != nextScript) && (nextScript != USCRIPT_INHERITED) && (!uscript_hasScript(character, currentScript)))) |
| break; |
| if (nextScript == USCRIPT_INHERITED) |
| nextScript = currentScript; |
| currentCharacterPosition = iterator.characters(); |
| } |
| unsigned numCharactersOfCurrentRun = iterator.currentCharacter() - startIndexOfCurrentRun; |
| hb_script_t script = hb_icu_script_to_script(currentScript); |
| m_harfBuzzRuns.append(HarfBuzzRun::create(currentFontData, startIndexOfCurrentRun, numCharactersOfCurrentRun, m_run.direction(), script)); |
| currentFontData = nextFontData; |
| startIndexOfCurrentRun = iterator.currentCharacter(); |
| } while (iterator.consume(character, clusterLength)); |
| |
| return !m_harfBuzzRuns.isEmpty(); |
| } |
| |
| bool HarfBuzzShaper::shapeHarfBuzzRuns(bool shouldSetDirection) |
| { |
| HarfBuzzScopedPtr<hb_buffer_t> harfBuzzBuffer(hb_buffer_create(), hb_buffer_destroy); |
| |
| hb_buffer_set_unicode_funcs(harfBuzzBuffer.get(), hb_icu_get_unicode_funcs()); |
| |
| for (unsigned i = 0; i < m_harfBuzzRuns.size(); ++i) { |
| unsigned runIndex = m_run.rtl() ? m_harfBuzzRuns.size() - i - 1 : i; |
| HarfBuzzRun* currentRun = m_harfBuzzRuns[runIndex].get(); |
| const SimpleFontData* currentFontData = currentRun->fontData(); |
| if (currentFontData->isSVGFont()) |
| return false; |
| |
| hb_buffer_set_script(harfBuzzBuffer.get(), currentRun->script()); |
| if (shouldSetDirection) |
| hb_buffer_set_direction(harfBuzzBuffer.get(), currentRun->rtl() ? HB_DIRECTION_RTL : HB_DIRECTION_LTR); |
| else |
| // Leaving direction to HarfBuzz to guess is *really* bad, but will do for now. |
| hb_buffer_guess_segment_properties(harfBuzzBuffer.get()); |
| |
| // Add a space as pre-context to the buffer. This prevents showing dotted-circle |
| // for combining marks at the beginning of runs. |
| static const uint16_t preContext = ' '; |
| hb_buffer_add_utf16(harfBuzzBuffer.get(), &preContext, 1, 1, 0); |
| |
| if (m_font->isSmallCaps() && u_islower(m_normalizedBuffer[currentRun->startIndex()])) { |
| String upperText = String(m_normalizedBuffer.get() + currentRun->startIndex(), currentRun->numCharacters()).upper(); |
| currentFontData = m_font->glyphDataForCharacter(upperText[0], false, SmallCapsVariant).fontData; |
| hb_buffer_add_utf16(harfBuzzBuffer.get(), reinterpret_cast<const uint16_t*>(upperText.characters()), currentRun->numCharacters(), 0, currentRun->numCharacters()); |
| } else |
| hb_buffer_add_utf16(harfBuzzBuffer.get(), reinterpret_cast<const uint16_t*>(m_normalizedBuffer.get() + currentRun->startIndex()), currentRun->numCharacters(), 0, currentRun->numCharacters()); |
| |
| FontPlatformData* platformData = const_cast<FontPlatformData*>(¤tFontData->platformData()); |
| HarfBuzzFace* face = platformData->harfBuzzFace(); |
| if (!face) |
| return false; |
| |
| if (m_font->fontDescription().orientation() == Vertical) |
| face->setScriptForVerticalGlyphSubstitution(harfBuzzBuffer.get()); |
| |
| HarfBuzzScopedPtr<hb_font_t> harfBuzzFont(face->createFont(), hb_font_destroy); |
| |
| hb_shape(harfBuzzFont.get(), harfBuzzBuffer.get(), m_features.isEmpty() ? 0 : m_features.data(), m_features.size()); |
| |
| currentRun->applyShapeResult(harfBuzzBuffer.get()); |
| setGlyphPositionsForHarfBuzzRun(currentRun, harfBuzzBuffer.get()); |
| |
| hb_buffer_reset(harfBuzzBuffer.get()); |
| } |
| |
| return true; |
| } |
| |
| 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(); |
| } |
| |
| void HarfBuzzShaper::fillGlyphBufferFromHarfBuzzRun(GlyphBuffer* glyphBuffer, HarfBuzzRun* currentRun, FloatPoint& firstOffsetOfNextRun) |
| { |
| FloatPoint* offsets = currentRun->offsets(); |
| uint16_t* glyphs = currentRun->glyphs(); |
| float* advances = currentRun->advances(); |
| unsigned numGlyphs = currentRun->numGlyphs(); |
| uint16_t* glyphToCharacterIndexes = currentRun->glyphToCharacterIndexes(); |
| |
| for (unsigned i = 0; i < numGlyphs; ++i) { |
| uint16_t currentCharacterIndex = currentRun->startIndex() + glyphToCharacterIndexes[i]; |
| FloatPoint& currentOffset = offsets[i]; |
| FloatPoint& nextOffset = (i == numGlyphs - 1) ? firstOffsetOfNextRun : offsets[i + 1]; |
| float glyphAdvanceX = advances[i] + nextOffset.x() - currentOffset.x(); |
| float glyphAdvanceY = nextOffset.y() - currentOffset.y(); |
| if (m_run.rtl()) { |
| if (currentCharacterIndex > m_toIndex) |
| m_startOffset.move(glyphAdvanceX, glyphAdvanceY); |
| else if (currentCharacterIndex >= m_fromIndex) |
| glyphBuffer->add(glyphs[i], currentRun->fontData(), createGlyphBufferAdvance(glyphAdvanceX, glyphAdvanceY)); |
| } else { |
| if (currentCharacterIndex < m_fromIndex) |
| m_startOffset.move(glyphAdvanceX, glyphAdvanceY); |
| else if (currentCharacterIndex < m_toIndex) |
| glyphBuffer->add(glyphs[i], currentRun->fontData(), createGlyphBufferAdvance(glyphAdvanceX, glyphAdvanceY)); |
| } |
| } |
| } |
| |
| bool HarfBuzzShaper::fillGlyphBuffer(GlyphBuffer* glyphBuffer) |
| { |
| unsigned numRuns = m_harfBuzzRuns.size(); |
| if (m_run.rtl()) { |
| m_startOffset = m_harfBuzzRuns.last()->offsets()[0]; |
| for (int runIndex = numRuns - 1; runIndex >= 0; --runIndex) { |
| HarfBuzzRun* currentRun = m_harfBuzzRuns[runIndex].get(); |
| FloatPoint firstOffsetOfNextRun = !runIndex ? FloatPoint() : m_harfBuzzRuns[runIndex - 1]->offsets()[0]; |
| fillGlyphBufferFromHarfBuzzRun(glyphBuffer, currentRun, firstOffsetOfNextRun); |
| } |
| } else { |
| m_startOffset = m_harfBuzzRuns.first()->offsets()[0]; |
| for (unsigned runIndex = 0; runIndex < numRuns; ++runIndex) { |
| HarfBuzzRun* currentRun = m_harfBuzzRuns[runIndex].get(); |
| FloatPoint firstOffsetOfNextRun = runIndex == numRuns - 1 ? FloatPoint() : m_harfBuzzRuns[runIndex + 1]->offsets()[0]; |
| fillGlyphBufferFromHarfBuzzRun(glyphBuffer, currentRun, firstOffsetOfNextRun); |
| } |
| } |
| return glyphBuffer->size(); |
| } |
| |
| int HarfBuzzShaper::offsetForPosition(float targetX) |
| { |
| int charactersSoFar = 0; |
| float currentX = 0; |
| |
| if (m_run.rtl()) { |
| charactersSoFar = m_normalizedBufferLength; |
| for (int i = m_harfBuzzRuns.size() - 1; i >= 0; --i) { |
| charactersSoFar -= m_harfBuzzRuns[i]->numCharacters(); |
| float nextX = currentX + m_harfBuzzRuns[i]->width(); |
| float offsetForRun = targetX - currentX; |
| if (offsetForRun >= 0 && offsetForRun <= m_harfBuzzRuns[i]->width()) { |
| // The x value in question is within this script run. |
| const unsigned index = m_harfBuzzRuns[i]->characterIndexForXPosition(offsetForRun); |
| return charactersSoFar + index; |
| } |
| currentX = nextX; |
| } |
| } else { |
| for (unsigned i = 0; i < m_harfBuzzRuns.size(); ++i) { |
| float nextX = currentX + m_harfBuzzRuns[i]->width(); |
| float offsetForRun = targetX - currentX; |
| if (offsetForRun >= 0 && offsetForRun <= m_harfBuzzRuns[i]->width()) { |
| const unsigned index = m_harfBuzzRuns[i]->characterIndexForXPosition(offsetForRun); |
| return charactersSoFar + index; |
| } |
| charactersSoFar += m_harfBuzzRuns[i]->numCharacters(); |
| currentX = nextX; |
| } |
| } |
| |
| return charactersSoFar; |
| } |
| |
| FloatRect HarfBuzzShaper::selectionRect(const FloatPoint& point, int height, int from, int to) |
| { |
| float currentX = 0; |
| float fromX = 0; |
| float toX = 0; |
| bool foundFromX = false; |
| bool foundToX = false; |
| |
| if (m_run.rtl()) |
| currentX = m_totalWidth; |
| for (unsigned i = 0; i < m_harfBuzzRuns.size(); ++i) { |
| if (m_run.rtl()) |
| currentX -= m_harfBuzzRuns[i]->width(); |
| int numCharacters = m_harfBuzzRuns[i]->numCharacters(); |
| if (!foundFromX && from >= 0 && from < numCharacters) { |
| fromX = m_harfBuzzRuns[i]->xPositionForOffset(from) + currentX; |
| foundFromX = true; |
| } else |
| from -= numCharacters; |
| |
| if (!foundToX && to >= 0 && to < numCharacters) { |
| toX = m_harfBuzzRuns[i]->xPositionForOffset(to) + currentX; |
| foundToX = true; |
| } else |
| to -= numCharacters; |
| |
| if (foundFromX && foundToX) |
| break; |
| if (!m_run.rtl()) |
| currentX += m_harfBuzzRuns[i]->width(); |
| } |
| |
| // The position in question might be just after the text. |
| if (!foundFromX) |
| fromX = 0; |
| if (!foundToX) |
| toX = m_run.rtl() ? 0 : m_totalWidth; |
| |
| // Using floorf() and roundf() as the same as mac port. |
| if (fromX < toX) |
| return FloatRect(floorf(point.x() + fromX), point.y(), roundf(toX - fromX), height); |
| return FloatRect(floorf(point.x() + toX), point.y(), roundf(fromX - toX), height); |
| } |
| |
| } // namespace WebCore |
