| // Copyright 2019 Google LLC. |
| |
| #include "modules/skparagraph/src/Iterators.h" |
| #include "modules/skparagraph/src/OneLineShaper.h" |
| #include "src/utils/SkUTF.h" |
| #include <algorithm> |
| #include <unordered_set> |
| |
| static inline SkUnichar nextUtf8Unit(const char** ptr, const char* end) { |
| SkUnichar val = SkUTF::NextUTF8(ptr, end); |
| return val < 0 ? 0xFFFD : val; |
| } |
| |
| namespace skia { |
| namespace textlayout { |
| |
| void OneLineShaper::commitRunBuffer(const RunInfo&) { |
| |
| fCurrentRun->commit(); |
| |
| auto oldUnresolvedCount = fUnresolvedBlocks.size(); |
| /* |
| SkDebugf("Run [%d:%d)\n", fCurrentRun->fTextRange.start, fCurrentRun->fTextRange.end); |
| for (size_t i = 0; i < fCurrentRun->size(); ++i) { |
| SkDebugf("[%d] %d %d %f\n", i, fCurrentRun->fGlyphs[i], fCurrentRun->fClusterIndexes[i], fCurrentRun->fPositions[i].fX); |
| } |
| */ |
| // Find all unresolved blocks |
| sortOutGlyphs([&](GlyphRange block){ |
| if (block.width() == 0) { |
| return; |
| } |
| addUnresolvedWithRun(block); |
| }); |
| |
| // Fill all the gaps between unresolved blocks with resolved ones |
| if (oldUnresolvedCount == fUnresolvedBlocks.size()) { |
| // No unresolved blocks added - we resolved the block with one run entirely |
| addFullyResolved(); |
| return; |
| } else if (oldUnresolvedCount == fUnresolvedBlocks.size() - 1) { |
| auto& unresolved = fUnresolvedBlocks.back(); |
| if (fCurrentRun->textRange() == unresolved.fText) { |
| // Nothing was resolved; preserve the initial run if it makes sense |
| auto& front = fUnresolvedBlocks.front(); |
| if (front.fRun != nullptr) { |
| unresolved.fRun = front.fRun; |
| unresolved.fGlyphs = front.fGlyphs; |
| } |
| return; |
| } |
| } |
| |
| fillGaps(oldUnresolvedCount); |
| } |
| |
| #ifdef SK_DEBUG |
| void OneLineShaper::printState() { |
| SkDebugf("Resolved: %d\n", fResolvedBlocks.size()); |
| for (auto& resolved : fResolvedBlocks) { |
| if (resolved.fRun == nullptr) { |
| SkDebugf("[%d:%d) unresolved\n", |
| resolved.fText.start, resolved.fText.end); |
| continue; |
| } |
| SkString name("???"); |
| if (resolved.fRun->fFont.getTypeface() != nullptr) { |
| resolved.fRun->fFont.getTypeface()->getFamilyName(&name); |
| } |
| SkDebugf("[%d:%d) ", resolved.fGlyphs.start, resolved.fGlyphs.end); |
| SkDebugf("[%d:%d) with %s\n", |
| resolved.fText.start, resolved.fText.end, |
| name.c_str()); |
| } |
| |
| auto size = fUnresolvedBlocks.size(); |
| SkDebugf("Unresolved: %d\n", size); |
| for (const auto& unresolved : fUnresolvedBlocks) { |
| SkDebugf("[%d:%d)\n", unresolved.fText.start, unresolved.fText.end); |
| } |
| } |
| #endif |
| |
| void OneLineShaper::fillGaps(size_t startingCount) { |
| // Fill out gaps between all unresolved blocks |
| TextRange resolvedTextLimits = fCurrentRun->fTextRange; |
| if (!fCurrentRun->leftToRight()) { |
| std::swap(resolvedTextLimits.start, resolvedTextLimits.end); |
| } |
| TextIndex resolvedTextStart = resolvedTextLimits.start; |
| GlyphIndex resolvedGlyphsStart = 0; |
| |
| auto begin = fUnresolvedBlocks.begin(); |
| auto end = fUnresolvedBlocks.end(); |
| begin += startingCount; // Skip the old ones, do the new ones |
| TextRange prevText = EMPTY_TEXT; |
| for (; begin != end; ++begin) { |
| auto& unresolved = *begin; |
| |
| if (unresolved.fText == prevText) { |
| // Clean up repetitive blocks that appear inside the same grapheme block |
| unresolved.fText = EMPTY_TEXT; |
| continue; |
| } else { |
| prevText = unresolved.fText; |
| } |
| |
| TextRange resolvedText(resolvedTextStart, fCurrentRun->leftToRight() ? unresolved.fText.start : unresolved.fText.end); |
| if (resolvedText.width() > 0) { |
| if (!fCurrentRun->leftToRight()) { |
| std::swap(resolvedText.start, resolvedText.end); |
| } |
| |
| GlyphRange resolvedGlyphs(resolvedGlyphsStart, unresolved.fGlyphs.start); |
| RunBlock resolved(fCurrentRun, resolvedText, resolvedGlyphs, resolvedGlyphs.width()); |
| |
| if (resolvedGlyphs.width() == 0) { |
| // Extend the unresolved block with an empty resolved |
| if (unresolved.fText.end <= resolved.fText.start) { |
| unresolved.fText.end = resolved.fText.end; |
| } |
| if (unresolved.fText.start >= resolved.fText.end) { |
| unresolved.fText.start = resolved.fText.start; |
| } |
| } else { |
| fResolvedBlocks.emplace_back(resolved); |
| } |
| } |
| resolvedGlyphsStart = unresolved.fGlyphs.end; |
| resolvedTextStart = fCurrentRun->leftToRight() |
| ? unresolved.fText.end |
| : unresolved.fText.start; |
| } |
| |
| TextRange resolvedText(resolvedTextStart,resolvedTextLimits.end); |
| if (resolvedText.width() > 0) { |
| if (!fCurrentRun->leftToRight()) { |
| std::swap(resolvedText.start, resolvedText.end); |
| } |
| |
| GlyphRange resolvedGlyphs(resolvedGlyphsStart, fCurrentRun->size()); |
| RunBlock resolved(fCurrentRun, resolvedText, resolvedGlyphs, resolvedGlyphs.width()); |
| fResolvedBlocks.emplace_back(resolved); |
| } |
| } |
| |
| void OneLineShaper::finish(const Block& block, SkScalar height, SkScalar& advanceX) { |
| auto blockText = block.fRange; |
| |
| // Add all unresolved blocks to resolved blocks |
| while (!fUnresolvedBlocks.empty()) { |
| auto unresolved = fUnresolvedBlocks.front(); |
| fUnresolvedBlocks.pop_front(); |
| if (unresolved.fText.width() == 0) { |
| continue; |
| } |
| fResolvedBlocks.emplace_back(unresolved); |
| fUnresolvedGlyphs += unresolved.fGlyphs.width(); |
| } |
| |
| // Sort all pieces by text |
| std::sort(fResolvedBlocks.begin(), fResolvedBlocks.end(), |
| [](const RunBlock& a, const RunBlock& b) { |
| return a.fText.start < b.fText.start; |
| }); |
| |
| // Go through all of them |
| size_t lastTextEnd = blockText.start; |
| for (auto& resolvedBlock : fResolvedBlocks) { |
| |
| if (resolvedBlock.fText.end <= blockText.start) { |
| continue; |
| } |
| |
| if (resolvedBlock.fRun != nullptr) { |
| fParagraph->fFontSwitches.emplace_back(resolvedBlock.fText.start, resolvedBlock.fRun->fFont); |
| } |
| |
| auto run = resolvedBlock.fRun; |
| auto glyphs = resolvedBlock.fGlyphs; |
| auto text = resolvedBlock.fText; |
| if (lastTextEnd != text.start) { |
| SkDEBUGF("Text ranges mismatch: ...:%d] - [%d:%d] (%d-%d)\n", lastTextEnd, text.start, text.end, glyphs.start, glyphs.end); |
| SkASSERT(false); |
| } |
| lastTextEnd = text.end; |
| |
| if (resolvedBlock.isFullyResolved()) { |
| // Just move the entire run |
| resolvedBlock.fRun->fIndex = this->fParagraph->fRuns.size(); |
| this->fParagraph->fRuns.emplace_back(*resolvedBlock.fRun); |
| resolvedBlock.fRun.reset(); |
| continue; |
| } else if (run == nullptr) { |
| continue; |
| } |
| |
| auto runAdvance = SkVector::Make(run->posX(glyphs.end) - run->posX(glyphs.start), run->fAdvance.fY); |
| const SkShaper::RunHandler::RunInfo info = { |
| run->fFont, |
| run->fBidiLevel, |
| runAdvance, |
| glyphs.width(), |
| SkShaper::RunHandler::Range(text.start - run->fClusterStart, text.width()) |
| }; |
| this->fParagraph->fRuns.emplace_back( |
| this->fParagraph, |
| info, |
| run->fClusterStart, |
| height, |
| block.fStyle.getHalfLeading(), |
| this->fParagraph->fRuns.count(), |
| advanceX |
| ); |
| auto piece = &this->fParagraph->fRuns.back(); |
| |
| // TODO: Optimize copying |
| auto zero = run->fPositions[glyphs.start]; |
| for (size_t i = glyphs.start; i <= glyphs.end; ++i) { |
| |
| auto index = i - glyphs.start; |
| if (i < glyphs.end) { |
| piece->fGlyphs[index] = run->fGlyphs[i]; |
| piece->fBounds[index] = run->fBounds[i]; |
| } |
| piece->fClusterIndexes[index] = run->fClusterIndexes[i]; |
| piece->fPositions[index] = run->fPositions[i] - zero; |
| piece->addX(index, advanceX); |
| } |
| |
| // Carve out the line text out of the entire run text |
| fAdvance.fX += runAdvance.fX; |
| fAdvance.fY = std::max(fAdvance.fY, runAdvance.fY); |
| } |
| |
| advanceX = fAdvance.fX; |
| if (lastTextEnd != blockText.end) { |
| SkDEBUGF("Last range mismatch: %d - %d\n", lastTextEnd, blockText.end); |
| SkASSERT(false); |
| } |
| } |
| |
| // Make it [left:right) regardless of a text direction |
| TextRange OneLineShaper::normalizeTextRange(GlyphRange glyphRange) { |
| |
| if (fCurrentRun->leftToRight()) { |
| return TextRange(clusterIndex(glyphRange.start), clusterIndex(glyphRange.end)); |
| } else { |
| return TextRange(clusterIndex(glyphRange.end - 1), |
| glyphRange.start > 0 |
| ? clusterIndex(glyphRange.start - 1) |
| : fCurrentRun->fTextRange.end); |
| } |
| } |
| |
| void OneLineShaper::addFullyResolved() { |
| if (this->fCurrentRun->size() == 0) { |
| return; |
| } |
| RunBlock resolved(fCurrentRun, |
| this->fCurrentRun->fTextRange, |
| GlyphRange(0, this->fCurrentRun->size()), |
| this->fCurrentRun->size()); |
| fResolvedBlocks.emplace_back(resolved); |
| } |
| |
| void OneLineShaper::addUnresolvedWithRun(GlyphRange glyphRange) { |
| RunBlock unresolved(fCurrentRun, clusteredText(glyphRange), glyphRange, 0); |
| if (unresolved.fGlyphs.width() == fCurrentRun->size()) { |
| SkASSERT(unresolved.fText.width() == fCurrentRun->fTextRange.width()); |
| } else if (fUnresolvedBlocks.size() > 0) { |
| auto& lastUnresolved = fUnresolvedBlocks.back(); |
| if (lastUnresolved.fRun != nullptr && |
| lastUnresolved.fRun->fIndex == fCurrentRun->fIndex) { |
| |
| if (lastUnresolved.fText.end == unresolved.fText.start) { |
| // Two pieces next to each other - can join them |
| lastUnresolved.fText.end = unresolved.fText.end; |
| lastUnresolved.fGlyphs.end = glyphRange.end; |
| return; |
| } else if(lastUnresolved.fText == unresolved.fText) { |
| // Nothing was resolved; ignore it |
| return; |
| } else if (lastUnresolved.fText.contains(unresolved.fText)) { |
| // We get here for the very first unresolved piece |
| return; |
| } else if (lastUnresolved.fText.intersects(unresolved.fText)) { |
| // Few pieces of the same unresolved text block can ignore the second one |
| lastUnresolved.fGlyphs.start = std::min(lastUnresolved.fGlyphs.start, glyphRange.start); |
| lastUnresolved.fGlyphs.end = std::max(lastUnresolved.fGlyphs.end, glyphRange.end); |
| lastUnresolved.fText = clusteredText(lastUnresolved.fGlyphs); |
| return; |
| } |
| } |
| } |
| fUnresolvedBlocks.emplace_back(unresolved); |
| } |
| |
| // Glue whitespaces to the next/prev unresolved blocks |
| // (so we don't have chinese text with english whitespaces broken into millions of tiny runs) |
| #ifndef SK_PARAGRAPH_GRAPHEME_EDGES |
| void OneLineShaper::sortOutGlyphs(std::function<void(GlyphRange)>&& sortOutUnresolvedBLock) { |
| |
| auto text = fCurrentRun->fOwner->text(); |
| size_t unresolvedGlyphs = 0; |
| |
| GlyphRange block = EMPTY_RANGE; |
| bool graphemeResolved = false; |
| TextIndex graphemeStart = EMPTY_INDEX; |
| for (size_t i = 0; i < fCurrentRun->size(); ++i) { |
| |
| ClusterIndex ci = clusterIndex(i); |
| // Removing all pretty optimizations for whitespaces |
| // because they get in a way of grapheme rounding |
| // Inspect the glyph |
| auto glyph = fCurrentRun->fGlyphs[i]; |
| |
| GraphemeIndex gi = fParagraph->findPreviousGraphemeBoundary(ci); |
| if ((fCurrentRun->leftToRight() ? gi > graphemeStart : gi < graphemeStart) || graphemeStart == EMPTY_INDEX) { |
| // This is the Flutter change |
| // Do not count control codepoints as unresolved |
| const char* cluster = text.begin() + ci; |
| SkUnichar codepoint = nextUtf8Unit(&cluster, text.end()); |
| bool isControl8 = fParagraph->getUnicode()->isControl(codepoint); |
| // We only count glyph resolved if all the glyphs in its grapheme are resolved |
| graphemeResolved = glyph != 0 || isControl8; |
| graphemeStart = gi; |
| } else if (glyph == 0) { |
| // Found unresolved glyph - the entire grapheme is unresolved now |
| graphemeResolved = false; |
| } |
| |
| if (!graphemeResolved) { // Unresolved glyph and not control codepoint |
| ++unresolvedGlyphs; |
| if (block.start == EMPTY_INDEX) { |
| // Start new unresolved block |
| block.start = i; |
| block.end = EMPTY_INDEX; |
| } else { |
| // Keep skipping unresolved block |
| } |
| } else { // Resolved glyph or control codepoint |
| if (block.start == EMPTY_INDEX) { |
| // Keep skipping resolved code points |
| } else { |
| // This is the end of unresolved block |
| block.end = i; |
| sortOutUnresolvedBLock(block); |
| block = EMPTY_RANGE; |
| } |
| } |
| } |
| |
| // One last block could have been left |
| if (block.start != EMPTY_INDEX) { |
| block.end = fCurrentRun->size(); |
| sortOutUnresolvedBLock(block); |
| } |
| } |
| #else |
| void OneLineShaper::sortOutGlyphs(std::function<void(GlyphRange)>&& sortOutUnresolvedBLock) { |
| |
| auto text = fCurrentRun->fOwner->text(); |
| size_t unresolvedGlyphs = 0; |
| |
| TextIndex whitespacesStart = EMPTY_INDEX; |
| GlyphRange block = EMPTY_RANGE; |
| for (size_t i = 0; i < fCurrentRun->size(); ++i) { |
| |
| const char* cluster = text.begin() + clusterIndex(i); |
| SkUnichar codepoint = nextUtf8Unit(&cluster, text.end()); |
| bool isControl8 = fParagraph->getUnicode()->isControl(codepoint); |
| // TODO: This is a temp change to match space handiling in LibTxt |
| // (all spaces are resolved with the main font) |
| #ifdef SK_PARAGRAPH_LIBTXT_SPACES_RESOLUTION |
| bool isWhitespace8 = false; // fParagraph->getUnicode()->isWhitespace(codepoint); |
| #else |
| bool isWhitespace8 = fParagraph->getUnicode()->isWhitespace(codepoint); |
| #endif |
| // Inspect the glyph |
| auto glyph = fCurrentRun->fGlyphs[i]; |
| if (glyph == 0 && !isControl8) { // Unresolved glyph and not control codepoint |
| ++unresolvedGlyphs; |
| if (block.start == EMPTY_INDEX) { |
| // Start new unresolved block |
| // (all leading whitespaces glued to the resolved part if it's not empty) |
| block.start = whitespacesStart == 0 ? 0 : i; |
| block.end = EMPTY_INDEX; |
| } else { |
| // Keep skipping unresolved block |
| } |
| } else { // Resolved glyph or control codepoint |
| if (block.start == EMPTY_INDEX) { |
| // Keep skipping resolved code points |
| } else if (isWhitespace8) { |
| // Glue whitespaces after to the unresolved block |
| ++unresolvedGlyphs; |
| } else { |
| // This is the end of unresolved block (all trailing whitespaces glued to the resolved part) |
| block.end = whitespacesStart == EMPTY_INDEX ? i : whitespacesStart; |
| sortOutUnresolvedBLock(block); |
| block = EMPTY_RANGE; |
| whitespacesStart = EMPTY_INDEX; |
| } |
| } |
| |
| // Keep updated the start of the latest whitespaces patch |
| if (isWhitespace8) { |
| if (whitespacesStart == EMPTY_INDEX) { |
| whitespacesStart = i; |
| } |
| } else { |
| whitespacesStart = EMPTY_INDEX; |
| } |
| } |
| |
| // One last block could have been left |
| if (block.start != EMPTY_INDEX) { |
| block.end = fCurrentRun->size(); |
| sortOutUnresolvedBLock(block); |
| } |
| } |
| #endif |
| |
| void OneLineShaper::iterateThroughFontStyles(TextRange textRange, |
| SkSpan<Block> styleSpan, |
| const ShapeSingleFontVisitor& visitor) { |
| Block combinedBlock; |
| SkTArray<SkShaper::Feature> features; |
| |
| auto addFeatures = [&features](const Block& block) { |
| for (auto& ff : block.fStyle.getFontFeatures()) { |
| if (ff.fName.size() != 4) { |
| SkDEBUGF("Incorrect font feature: %s=%d\n", ff.fName.c_str(), ff.fValue); |
| continue; |
| } |
| SkShaper::Feature feature = { |
| SkSetFourByteTag(ff.fName[0], ff.fName[1], ff.fName[2], ff.fName[3]), |
| SkToU32(ff.fValue), |
| block.fRange.start, |
| block.fRange.end |
| }; |
| features.emplace_back(feature); |
| } |
| }; |
| |
| for (auto& block : styleSpan) { |
| BlockRange blockRange(std::max(block.fRange.start, textRange.start), std::min(block.fRange.end, textRange.end)); |
| if (blockRange.empty()) { |
| continue; |
| } |
| SkASSERT(combinedBlock.fRange.width() == 0 || combinedBlock.fRange.end == block.fRange.start); |
| |
| if (!combinedBlock.fRange.empty()) { |
| if (block.fStyle.matchOneAttribute(StyleType::kFont, combinedBlock.fStyle)) { |
| combinedBlock.add(blockRange); |
| addFeatures(block); |
| continue; |
| } |
| // Resolve all characters in the block for this style |
| visitor(combinedBlock, features); |
| } |
| |
| combinedBlock.fRange = blockRange; |
| combinedBlock.fStyle = block.fStyle; |
| features.reset(); |
| addFeatures(block); |
| } |
| |
| visitor(combinedBlock, features); |
| #ifdef SK_DEBUG |
| //printState(); |
| #endif |
| } |
| |
| void OneLineShaper::matchResolvedFonts(const TextStyle& textStyle, |
| const TypefaceVisitor& visitor) { |
| std::vector<sk_sp<SkTypeface>> typefaces = fParagraph->fFontCollection->findTypefaces(textStyle.getFontFamilies(), textStyle.getFontStyle()); |
| |
| for (const auto& typeface : typefaces) { |
| if (visitor(typeface) == Resolved::Everything) { |
| // Resolved everything |
| return; |
| } |
| } |
| |
| if (fParagraph->fFontCollection->fontFallbackEnabled()) { |
| // Give fallback a clue |
| // Some unresolved subblocks might be resolved with different fallback fonts |
| while (!fUnresolvedBlocks.empty()) { |
| auto unresolvedRange = fUnresolvedBlocks.front().fText; |
| auto unresolvedText = fParagraph->text(unresolvedRange); |
| const char* ch = unresolvedText.begin(); |
| // We have the global cache for all already found typefaces for SkUnichar |
| // but we still need to keep track of all SkUnichars used in this unresolved block |
| SkTHashSet<SkUnichar> alreadyTried; |
| SkUnichar unicode = nextUtf8Unit(&ch, unresolvedText.end()); |
| while (true) { |
| |
| sk_sp<SkTypeface> typeface; |
| |
| // First try to find in in a cache |
| FontKey fontKey(unicode, textStyle.getFontStyle(), textStyle.getLocale()); |
| auto found = fFallbackFonts.find(fontKey); |
| if (found != nullptr) { |
| typeface = *found; |
| } else { |
| typeface = fParagraph->fFontCollection->defaultFallback( |
| unicode, textStyle.getFontStyle(), textStyle.getLocale()); |
| |
| if (typeface == nullptr) { |
| return; |
| } |
| fFallbackFonts.set(fontKey, typeface); |
| } |
| |
| auto resolved = visitor(typeface); |
| if (resolved == Resolved::Everything) { |
| // Resolved everything, no need to try another font |
| return; |
| } |
| |
| if (resolved == Resolved::Something) { |
| // Resolved something, no need to try another codepoint |
| break; |
| } |
| |
| if (ch == unresolvedText.end()) { |
| // Not a single codepoint could be resolved but we finished the block |
| break; |
| } |
| |
| // We can stop here or we can switch to another DIFFERENT codepoint |
| while (ch != unresolvedText.end()) { |
| unicode = nextUtf8Unit(&ch, unresolvedText.end()); |
| auto found = alreadyTried.find(unicode); |
| if (found == nullptr) { |
| alreadyTried.add(unicode); |
| break; |
| } |
| } |
| } |
| |
| } |
| } |
| } |
| |
| bool OneLineShaper::iterateThroughShapingRegions(const ShapeVisitor& shape) { |
| |
| size_t bidiIndex = 0; |
| |
| SkScalar advanceX = 0; |
| for (auto& placeholder : fParagraph->fPlaceholders) { |
| |
| if (placeholder.fTextBefore.width() > 0) { |
| // Shape the text by bidi regions |
| while (bidiIndex < fParagraph->fBidiRegions.size()) { |
| SkUnicode::BidiRegion& bidiRegion = fParagraph->fBidiRegions[bidiIndex]; |
| auto start = std::max(bidiRegion.start, placeholder.fTextBefore.start); |
| auto end = std::min(bidiRegion.end, placeholder.fTextBefore.end); |
| |
| // Set up the iterators (the style iterator points to a bigger region that it could |
| TextRange textRange(start, end); |
| auto blockRange = fParagraph->findAllBlocks(textRange); |
| SkSpan<Block> styleSpan(fParagraph->blocks(blockRange)); |
| |
| // Shape the text between placeholders |
| if (!shape(textRange, styleSpan, advanceX, start, bidiRegion.level)) { |
| return false; |
| } |
| |
| if (end == bidiRegion.end) { |
| ++bidiIndex; |
| } else /*if (end == placeholder.fTextBefore.end)*/ { |
| break; |
| } |
| } |
| } |
| |
| if (placeholder.fRange.width() == 0) { |
| continue; |
| } |
| |
| // Get the placeholder font |
| std::vector<sk_sp<SkTypeface>> typefaces = fParagraph->fFontCollection->findTypefaces( |
| placeholder.fTextStyle.getFontFamilies(), |
| placeholder.fTextStyle.getFontStyle()); |
| sk_sp<SkTypeface> typeface = typefaces.size() ? typefaces.front() : nullptr; |
| SkFont font(typeface, placeholder.fTextStyle.getFontSize()); |
| |
| // "Shape" the placeholder |
| const SkShaper::RunHandler::RunInfo runInfo = { |
| font, |
| (uint8_t)2, |
| SkPoint::Make(placeholder.fStyle.fWidth, placeholder.fStyle.fHeight), |
| 1, |
| SkShaper::RunHandler::Range(placeholder.fRange.start, placeholder.fRange.width()) |
| }; |
| auto& run = fParagraph->fRuns.emplace_back(this->fParagraph, |
| runInfo, |
| 0, |
| 0.0f, |
| false, |
| fParagraph->fRuns.count(), |
| advanceX); |
| |
| run.fPositions[0] = { advanceX, 0 }; |
| run.fClusterIndexes[0] = 0; |
| run.fPlaceholderIndex = &placeholder - fParagraph->fPlaceholders.begin(); |
| advanceX += placeholder.fStyle.fWidth; |
| } |
| return true; |
| } |
| |
| bool OneLineShaper::shape() { |
| |
| // The text can be broken into many shaping sequences |
| // (by place holders, possibly, by hard line breaks or tabs, too) |
| auto limitlessWidth = std::numeric_limits<SkScalar>::max(); |
| |
| auto result = iterateThroughShapingRegions( |
| [this, limitlessWidth] |
| (TextRange textRange, SkSpan<Block> styleSpan, SkScalar& advanceX, TextIndex textStart, uint8_t defaultBidiLevel) { |
| |
| // Set up the shaper and shape the next |
| auto shaper = SkShaper::MakeShapeDontWrapOrReorder(); |
| if (shaper == nullptr) { |
| // For instance, loadICU does not work. We have to stop the process |
| return false; |
| } |
| |
| iterateThroughFontStyles(textRange, styleSpan, |
| [this, &shaper, defaultBidiLevel, limitlessWidth, &advanceX] |
| (Block block, SkTArray<SkShaper::Feature> features) { |
| auto blockSpan = SkSpan<Block>(&block, 1); |
| |
| // Start from the beginning (hoping that it's a simple case one block - one run) |
| fHeight = block.fStyle.getHeightOverride() ? block.fStyle.getHeight() : 0; |
| fUseHalfLeading = block.fStyle.getHalfLeading(); |
| fAdvance = SkVector::Make(advanceX, 0); |
| fCurrentText = block.fRange; |
| fUnresolvedBlocks.emplace_back(RunBlock(block.fRange)); |
| |
| matchResolvedFonts(block.fStyle, [&](sk_sp<SkTypeface> typeface) { |
| |
| // Create one more font to try |
| SkFont font(std::move(typeface), block.fStyle.getFontSize()); |
| font.setEdging(SkFont::Edging::kAntiAlias); |
| font.setHinting(SkFontHinting::kSlight); |
| font.setSubpixel(true); |
| |
| // Apply fake bold and/or italic settings to the font if the |
| // typeface's attributes do not match the intended font style. |
| int wantedWeight = block.fStyle.getFontStyle().weight(); |
| bool fakeBold = |
| wantedWeight >= SkFontStyle::kSemiBold_Weight && |
| wantedWeight - font.getTypeface()->fontStyle().weight() >= 200; |
| bool fakeItalic = |
| block.fStyle.getFontStyle().slant() == SkFontStyle::kItalic_Slant && |
| font.getTypeface()->fontStyle().slant() != SkFontStyle::kItalic_Slant; |
| font.setEmbolden(fakeBold); |
| font.setSkewX(fakeItalic ? -SK_Scalar1 / 4 : 0); |
| |
| // Walk through all the currently unresolved blocks |
| // (ignoring those that appear later) |
| auto resolvedCount = fResolvedBlocks.size(); |
| auto unresolvedCount = fUnresolvedBlocks.size(); |
| while (unresolvedCount-- > 0) { |
| auto unresolvedRange = fUnresolvedBlocks.front().fText; |
| if (unresolvedRange == EMPTY_TEXT) { |
| // Duplicate blocks should be ignored |
| fUnresolvedBlocks.pop_front(); |
| continue; |
| } |
| auto unresolvedText = fParagraph->text(unresolvedRange); |
| |
| SkShaper::TrivialFontRunIterator fontIter(font, unresolvedText.size()); |
| LangIterator langIter(unresolvedText, blockSpan, |
| fParagraph->paragraphStyle().getTextStyle()); |
| SkShaper::TrivialBiDiRunIterator bidiIter(defaultBidiLevel, unresolvedText.size()); |
| auto scriptIter = SkShaper::MakeSkUnicodeHbScriptRunIterator |
| (fParagraph->getUnicode(), unresolvedText.begin(), unresolvedText.size()); |
| fCurrentText = unresolvedRange; |
| shaper->shape(unresolvedText.begin(), unresolvedText.size(), |
| fontIter, bidiIter,*scriptIter, langIter, |
| features.data(), features.size(), |
| limitlessWidth, this); |
| |
| // Take off the queue the block we tried to resolved - |
| // whatever happened, we have now smaller pieces of it to deal with |
| fUnresolvedBlocks.pop_front(); |
| } |
| |
| if (fUnresolvedBlocks.empty()) { |
| return Resolved::Everything; |
| } else if (resolvedCount < fResolvedBlocks.size()) { |
| return Resolved::Something; |
| } else { |
| return Resolved::Nothing; |
| } |
| }); |
| |
| this->finish(block, fHeight, advanceX); |
| }); |
| |
| return true; |
| }); |
| |
| return result; |
| } |
| |
| // When we extend TextRange to the grapheme edges, we also extend glyphs range |
| TextRange OneLineShaper::clusteredText(GlyphRange& glyphs) { |
| |
| enum class Dir { left, right }; |
| enum class Pos { inclusive, exclusive }; |
| |
| // [left: right) |
| auto findBaseChar = [&](TextIndex index, Dir dir) -> TextIndex { |
| |
| if (dir == Dir::right) { |
| while (index < fCurrentRun->fTextRange.end) { |
| if (this->fParagraph->codeUnitHasProperty(index, |
| CodeUnitFlags::kGraphemeStart)) { |
| return index; |
| } |
| ++index; |
| } |
| return fCurrentRun->fTextRange.end; |
| } else { |
| while (index > fCurrentRun->fTextRange.start) { |
| if (this->fParagraph->codeUnitHasProperty(index, |
| CodeUnitFlags::kGraphemeStart)) { |
| return index; |
| } |
| --index; |
| } |
| return fCurrentRun->fTextRange.start; |
| } |
| }; |
| |
| TextRange textRange(normalizeTextRange(glyphs)); |
| textRange.start = findBaseChar(textRange.start, Dir::left); |
| textRange.end = findBaseChar(textRange.end, Dir::right); |
| |
| // Correct the glyphRange in case we extended the text to the grapheme edges |
| // TODO: code it without if (as a part of LTR/RTL refactoring) |
| if (fCurrentRun->leftToRight()) { |
| while (glyphs.start > 0 && clusterIndex(glyphs.start) > textRange.start) { |
| glyphs.start--; |
| } |
| while (glyphs.end < fCurrentRun->size() && clusterIndex(glyphs.end) < textRange.end) { |
| glyphs.end++; |
| } |
| } else { |
| while (glyphs.start > 0 && clusterIndex(glyphs.start - 1) < textRange.end) { |
| glyphs.start--; |
| } |
| while (glyphs.end < fCurrentRun->size() && clusterIndex(glyphs.end) > textRange.start) { |
| glyphs.end++; |
| } |
| } |
| |
| return { textRange.start, textRange.end }; |
| } |
| |
| bool OneLineShaper::FontKey::operator==(const OneLineShaper::FontKey& other) const { |
| return fUnicode == other.fUnicode && fFontStyle == other.fFontStyle && fLocale == other.fLocale; |
| } |
| |
| size_t OneLineShaper::FontKey::Hasher::operator()(const OneLineShaper::FontKey& key) const { |
| |
| return SkGoodHash()(key.fUnicode) ^ |
| SkGoodHash()(key.fFontStyle) ^ |
| SkGoodHash()(key.fLocale.c_str()); |
| } |
| |
| } // namespace textlayout |
| } // namespace skia |
