| // Copyright 2019 Google LLC. |
| #include "modules/skparagraph/src/ParagraphImpl.h" |
| #include <unicode/brkiter.h> |
| #include <unicode/ubidi.h> |
| #include <unicode/unistr.h> |
| #include <unicode/urename.h> |
| #include "include/core/SkBlurTypes.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkFontMgr.h" |
| #include "include/core/SkPictureRecorder.h" |
| #include "modules/skparagraph/src/Iterators.h" |
| #include "modules/skparagraph/src/Run.h" |
| #include "modules/skparagraph/src/TextWrapper.h" |
| #include "src/core/SkSpan.h" |
| #include "src/utils/SkUTF.h" |
| |
| namespace { |
| |
| SkUnichar utf8_next(const char** ptr, const char* end) { |
| SkUnichar val = SkUTF::NextUTF8(ptr, end); |
| return val < 0 ? 0xFFFD : val; |
| } |
| |
| class TextBreaker { |
| public: |
| TextBreaker() : fPos(-1) {} |
| |
| bool initialize(SkSpan<const char> text, UBreakIteratorType type) { |
| UErrorCode status = U_ZERO_ERROR; |
| fIterator = nullptr; |
| fSize = text.size(); |
| UText utf8UText = UTEXT_INITIALIZER; |
| utext_openUTF8(&utf8UText, text.begin(), text.size(), &status); |
| fAutoClose = |
| std::unique_ptr<UText, SkFunctionWrapper<UText*, UText, utext_close>>(&utf8UText); |
| if (U_FAILURE(status)) { |
| SkDebugf("Could not create utf8UText: %s", u_errorName(status)); |
| return false; |
| } |
| fIterator.reset(ubrk_open(type, "en", nullptr, 0, &status)); |
| if (U_FAILURE(status)) { |
| SkDebugf("Could not create line break iterator: %s", u_errorName(status)); |
| SK_ABORT(""); |
| } |
| |
| ubrk_setUText(fIterator.get(), &utf8UText, &status); |
| if (U_FAILURE(status)) { |
| SkDebugf("Could not setText on break iterator: %s", u_errorName(status)); |
| return false; |
| } |
| |
| fPos = 0; |
| return true; |
| } |
| |
| size_t first() { |
| fPos = ubrk_first(fIterator.get()); |
| return eof() ? fSize : fPos; |
| } |
| |
| size_t next() { |
| fPos = ubrk_next(fIterator.get()); |
| return eof() ? fSize : fPos; |
| } |
| |
| int32_t status() { return ubrk_getRuleStatus(fIterator.get()); } |
| |
| bool eof() { return fPos == icu::BreakIterator::DONE; } |
| |
| private: |
| std::unique_ptr<UText, SkFunctionWrapper<UText*, UText, utext_close>> fAutoClose; |
| std::unique_ptr<UBreakIterator, SkFunctionWrapper<void, UBreakIterator, ubrk_close>> fIterator; |
| int32_t fPos; |
| size_t fSize; |
| }; |
| } // namespace |
| |
| namespace skia { |
| namespace textlayout { |
| |
| TextRange operator*(const TextRange& a, const TextRange& b) { |
| if (a.start == b.start && a.end == b.end) return a; |
| auto begin = SkTMax(a.start, b.start); |
| auto end = SkTMin(a.end, b.end); |
| return end > begin ? TextRange(begin, end) : EMPTY_TEXT; |
| } |
| |
| ParagraphImpl::ParagraphImpl(const SkString& text, |
| ParagraphStyle style, |
| SkTArray<Block, true> blocks, |
| sk_sp<FontCollection> fonts) |
| : Paragraph(std::move(style), std::move(fonts)) |
| , fTextStyles(std::move(blocks)) |
| , fText(text) |
| , fTextSpan(fText.c_str(), fText.size()) |
| , fState(kUnknown) |
| , fPicture(nullptr) |
| , fStrutMetrics(false) |
| , fOldWidth(0) |
| , fOldHeight(0) { |
| // TODO: extractStyles(); |
| } |
| |
| ParagraphImpl::ParagraphImpl(const std::u16string& utf16text, |
| ParagraphStyle style, |
| SkTArray<Block, true> blocks, |
| sk_sp<FontCollection> fonts) |
| : Paragraph(std::move(style), std::move(fonts)) |
| , fTextStyles(std::move(blocks)) |
| , fState(kUnknown) |
| , fPicture(nullptr) |
| , fStrutMetrics(false) |
| , fOldWidth(0) |
| , fOldHeight(0) { |
| icu::UnicodeString unicode((UChar*)utf16text.data(), SkToS32(utf16text.size())); |
| std::string str; |
| unicode.toUTF8String(str); |
| fText = SkString(str.data(), str.size()); |
| fTextSpan = SkSpan<const char>(fText.c_str(), fText.size()); |
| // TODO: extractStyles(); |
| } |
| |
| ParagraphImpl::~ParagraphImpl() = default; |
| |
| void ParagraphImpl::layout(SkScalar width) { |
| |
| if (fState < kShaped) { |
| // Layout marked as dirty for performance/testing reasons |
| this->fRuns.reset(); |
| this->fClusters.reset(); |
| } else if (fState >= kLineBroken && (fOldWidth != width || fOldHeight != fHeight)) { |
| // We can use the results from SkShaper but have to break lines again |
| fState = kShaped; |
| } |
| |
| if (fState < kShaped) { |
| fClusters.reset(); |
| |
| if (!this->shapeTextIntoEndlessLine()) { |
| // Apply the last style to the empty text |
| FontIterator font(SkMakeSpan(" "), &fFontResolver); |
| // Get the font metrics |
| font.consume(); |
| LineMetrics lineMetrics(font.currentFont(), paragraphStyle().getStrutStyle().getForceStrutHeight()); |
| // Set the important values that are not zero |
| fHeight = lineMetrics.height(); |
| fAlphabeticBaseline = lineMetrics.alphabeticBaseline(); |
| fIdeographicBaseline = lineMetrics.ideographicBaseline(); |
| } |
| if (fState < kShaped) { |
| fState = kShaped; |
| } else { |
| layout(width); |
| return; |
| } |
| |
| if (fState < kMarked) { |
| this->buildClusterTable(); |
| fState = kClusterized; |
| this->markLineBreaks(); |
| fState = kMarked; |
| |
| // Add the paragraph to the cache |
| fFontCollection->getParagraphCache()->updateParagraph(this); |
| } |
| } |
| |
| if (fState >= kLineBroken) { |
| if (fOldWidth != width || fOldHeight != fHeight) { |
| fState = kMarked; |
| } |
| } |
| |
| if (fState < kLineBroken) { |
| this->resetContext(); |
| this->resolveStrut(); |
| this->fLines.reset(); |
| this->breakShapedTextIntoLines(width); |
| fState = kLineBroken; |
| |
| } |
| |
| if (fState < kFormatted) { |
| // Build the picture lazily not until we actually have to paint (or never) |
| this->formatLines(fWidth); |
| fState = kFormatted; |
| } |
| |
| this->fOldWidth = width; |
| this->fOldHeight = this->fHeight; |
| } |
| |
| void ParagraphImpl::paint(SkCanvas* canvas, SkScalar x, SkScalar y) { |
| |
| if (fState < kDrawn) { |
| // Record the picture anyway (but if we have some pieces in the cache they will be used) |
| this->paintLinesIntoPicture(); |
| fState = kDrawn; |
| } |
| |
| SkMatrix matrix = SkMatrix::MakeTrans(x, y); |
| canvas->drawPicture(fPicture, &matrix, nullptr); |
| } |
| |
| void ParagraphImpl::resetContext() { |
| fAlphabeticBaseline = 0; |
| fHeight = 0; |
| fWidth = 0; |
| fIdeographicBaseline = 0; |
| fMaxIntrinsicWidth = 0; |
| fMinIntrinsicWidth = 0; |
| } |
| |
| // Clusters in the order of the input text |
| void ParagraphImpl::buildClusterTable() { |
| |
| // Walk through all the run in the direction of input text |
| for (RunIndex runIndex = 0; runIndex < fRuns.size(); ++runIndex) { |
| auto& run = fRuns[runIndex]; |
| auto runStart = fClusters.size(); |
| fClusters.reserve(fClusters.size() + fRuns.size()); |
| // Walk through the glyph in the direction of input text |
| run.iterateThroughClustersInTextOrder([runIndex, this]( |
| size_t glyphStart, |
| size_t glyphEnd, |
| size_t charStart, |
| size_t charEnd, |
| SkScalar width, |
| SkScalar height) { |
| SkASSERT(charEnd >= charStart); |
| SkSpan<const char> text(fTextSpan.begin() + charStart, charEnd - charStart); |
| |
| auto& cluster = fClusters.emplace_back(this, runIndex, glyphStart, glyphEnd, text, width, height); |
| cluster.setIsWhiteSpaces(); |
| }); |
| |
| run.setClusterRange(runStart, fClusters.size()); |
| fMaxIntrinsicWidth += run.advance().fX; |
| } |
| } |
| |
| // TODO: we need soft line breaks before for word spacing |
| void ParagraphImpl::markLineBreaks() { |
| |
| // Find all possible (soft) line breaks |
| TextBreaker breaker; |
| if (!breaker.initialize(fTextSpan, UBRK_LINE)) { |
| return; |
| } |
| |
| Cluster* current = fClusters.begin(); |
| while (!breaker.eof() && current < fClusters.end()) { |
| size_t currentPos = breaker.next(); |
| while (current < fClusters.end()) { |
| if (current->textRange().end > currentPos) { |
| break; |
| } else if (current->textRange().end == currentPos) { |
| current->setBreakType(breaker.status() == UBRK_LINE_HARD |
| ? Cluster::BreakType::HardLineBreak |
| : Cluster::BreakType::SoftLineBreak); |
| ++current; |
| break; |
| } |
| ++current; |
| } |
| } |
| |
| |
| // Walk through all the clusters in the direction of shaped text |
| Block* currentStyle = this->fTextStyles.begin(); |
| SkScalar shift = 0; |
| for (auto& run : fRuns) { |
| |
| bool soFarWhitespacesOnly = true; |
| for (size_t index = 0; index != run.clusterRange().width(); ++index) { |
| auto correctIndex = run.leftToRight() |
| ? index + run.clusterRange().start |
| : run.clusterRange().end - index - 1; |
| const auto cluster = &this->cluster(correctIndex); |
| |
| // Shift the cluster (shift collected from the previous clusters) |
| run.shift(cluster, shift); |
| |
| // Synchronize styles (one cluster can be covered by few styles) |
| while (!cluster->startsIn(currentStyle->fRange)) { |
| currentStyle++; |
| SkASSERT(currentStyle != this->fTextStyles.end()); |
| } |
| |
| // Process word spacing |
| if (currentStyle->fStyle.getWordSpacing() != 0/* && |
| fParagraphStyle.getTextAlign() != TextAlign::kJustify*/) { |
| if (cluster->isWhitespaces() && cluster->isSoftBreak()) { |
| if (!soFarWhitespacesOnly) { |
| shift += run.addSpacesAtTheEnd(currentStyle->fStyle.getWordSpacing(), cluster); |
| } |
| } |
| } |
| // Process letter spacing |
| if (currentStyle->fStyle.getLetterSpacing() != 0) { |
| shift += run.addSpacesEvenly(currentStyle->fStyle.getLetterSpacing(), cluster); |
| } |
| |
| if (soFarWhitespacesOnly && !cluster->isWhitespaces()) { |
| soFarWhitespacesOnly = false; |
| } |
| } |
| } |
| |
| fClusters.emplace_back(this, EMPTY_RUN, 0, 0, SkSpan<const char>(), 0, 0); |
| } |
| |
| bool ParagraphImpl::shapeTextIntoEndlessLine() { |
| |
| class ShapeHandler final : public SkShaper::RunHandler { |
| public: |
| explicit ShapeHandler(ParagraphImpl& paragraph, FontIterator* fontIterator) |
| : fParagraph(¶graph) |
| , fFontIterator(fontIterator) |
| , fAdvance(SkVector::Make(0, 0)) {} |
| |
| SkVector advance() const { return fAdvance; } |
| |
| private: |
| void beginLine() override {} |
| |
| void runInfo(const RunInfo&) override {} |
| |
| void commitRunInfo() override {} |
| |
| Buffer runBuffer(const RunInfo& info) override { |
| auto& run = fParagraph->fRuns.emplace_back(fParagraph, |
| info, |
| fFontIterator->currentLineHeight(), |
| fParagraph->fRuns.count(), |
| fAdvance.fX); |
| return run.newRunBuffer(); |
| } |
| |
| void commitRunBuffer(const RunInfo&) override { |
| auto& run = fParagraph->fRuns.back(); |
| if (run.size() == 0) { |
| fParagraph->fRuns.pop_back(); |
| return; |
| } |
| // Carve out the line text out of the entire run text |
| fAdvance.fX += run.advance().fX; |
| fAdvance.fY = SkMaxScalar(fAdvance.fY, run.descent() - run.ascent()); |
| } |
| |
| void commitLine() override {} |
| |
| ParagraphImpl* fParagraph; |
| FontIterator* fFontIterator; |
| SkVector fAdvance; |
| }; |
| |
| if (fTextSpan.empty()) { |
| return false; |
| } |
| |
| // This is a pretty big step - resolving all characters against all given fonts |
| fFontResolver.findAllFontsForAllStyledBlocks(this); |
| |
| // Check the font-resolved text against the cache |
| if (!fFontCollection->getParagraphCache()->findParagraph(this)) { |
| LangIterator lang(fTextSpan, styles(), paragraphStyle().getTextStyle()); |
| FontIterator font(fTextSpan, &fFontResolver); |
| ShapeHandler handler(*this, &font); |
| std::unique_ptr<SkShaper> shaper = SkShaper::MakeShapeDontWrapOrReorder(); |
| SkASSERT_RELEASE(shaper != nullptr); |
| auto bidi = SkShaper::MakeIcuBiDiRunIterator( |
| fTextSpan.begin(), fTextSpan.size(), |
| fParagraphStyle.getTextDirection() == TextDirection::kLtr ? (uint8_t)2 |
| : (uint8_t)1); |
| if (bidi == nullptr) { |
| return false; |
| } |
| auto script = SkShaper::MakeHbIcuScriptRunIterator(fTextSpan.begin(), fTextSpan.size()); |
| |
| shaper->shape(fTextSpan.begin(), fTextSpan.size(), font, *bidi, *script, lang, |
| std::numeric_limits<SkScalar>::max(), &handler); |
| } |
| |
| if (fParagraphStyle.getTextAlign() == TextAlign::kJustify) { |
| fRunShifts.reset(); |
| fRunShifts.push_back_n(fRuns.size(), RunShifts()); |
| for (size_t i = 0; i < fRuns.size(); ++i) { |
| fRunShifts[i].fShifts.push_back_n(fRuns[i].size() + 1, 0.0); |
| } |
| } |
| |
| return true; |
| } |
| |
| void ParagraphImpl::breakShapedTextIntoLines(SkScalar maxWidth) { |
| |
| TextWrapper textWrapper; |
| textWrapper.breakTextIntoLines( |
| this, |
| maxWidth, |
| [&](TextRange text, |
| TextRange textWithSpaces, |
| ClusterRange clusters, |
| ClusterRange clustersWithGhosts, |
| SkScalar widthWithSpaces, |
| size_t startPos, |
| size_t endPos, |
| SkVector offset, |
| SkVector advance, |
| LineMetrics metrics, |
| bool addEllipsis) { |
| // Add the line |
| // TODO: Take in account clipped edges |
| auto& line = this->addLine(offset, advance, text, textWithSpaces, clusters, clustersWithGhosts, widthWithSpaces, metrics); |
| if (addEllipsis) { |
| line.createEllipsis(maxWidth, fParagraphStyle.getEllipsis(), true); |
| } |
| }); |
| fHeight = textWrapper.height(); |
| fWidth = maxWidth; // fTextWrapper.width(); |
| fMinIntrinsicWidth = textWrapper.minIntrinsicWidth(); |
| fMaxIntrinsicWidth = textWrapper.maxIntrinsicWidth(); |
| fAlphabeticBaseline = fLines.empty() ? 0 : fLines.front().alphabeticBaseline(); |
| fIdeographicBaseline = fLines.empty() ? 0 : fLines.front().ideographicBaseline(); |
| } |
| |
| void ParagraphImpl::formatLines(SkScalar maxWidth) { |
| auto effectiveAlign = fParagraphStyle.effective_align(); |
| for (auto& line : fLines) { |
| if (&line == &fLines.back() && effectiveAlign == TextAlign::kJustify) { |
| effectiveAlign = line.assumedTextAlign(); |
| } |
| line.format(effectiveAlign, maxWidth); |
| } |
| } |
| |
| void ParagraphImpl::paintLinesIntoPicture() { |
| SkPictureRecorder recorder; |
| SkCanvas* textCanvas = recorder.beginRecording(fWidth, fHeight, nullptr, 0); |
| |
| for (auto& line : fLines) { |
| line.paint(textCanvas); |
| } |
| |
| fPicture = recorder.finishRecordingAsPicture(); |
| } |
| |
| void ParagraphImpl::resolveStrut() { |
| auto strutStyle = this->paragraphStyle().getStrutStyle(); |
| if (!strutStyle.getStrutEnabled() || strutStyle.getFontSize() < 0) { |
| return; |
| } |
| |
| sk_sp<SkTypeface> typeface; |
| for (auto& fontFamily : strutStyle.getFontFamilies()) { |
| typeface = fFontCollection->matchTypeface(fontFamily.c_str(), strutStyle.getFontStyle()); |
| if (typeface.get() != nullptr) { |
| break; |
| } |
| } |
| if (typeface.get() == nullptr) { |
| return; |
| } |
| |
| SkFont font(typeface, strutStyle.getFontSize()); |
| SkFontMetrics metrics; |
| font.getMetrics(&metrics); |
| |
| if (strutStyle.getHeightOverride()) { |
| auto strutHeight = metrics.fDescent - metrics.fAscent + metrics.fLeading; |
| auto strutMultiplier = strutStyle.getHeight() * strutStyle.getFontSize(); |
| fStrutMetrics = LineMetrics( |
| metrics.fAscent / strutHeight * strutMultiplier, |
| metrics.fDescent / strutHeight * strutMultiplier, |
| strutStyle.getLeading() < 0 ? 0 : strutStyle.getLeading() * strutStyle.getFontSize()); |
| } else { |
| fStrutMetrics = LineMetrics( |
| metrics.fAscent, |
| metrics.fDescent, |
| strutStyle.getLeading() < 0 ? 0 : strutStyle.getLeading() * strutStyle.getFontSize()); |
| } |
| } |
| |
| BlockRange ParagraphImpl::findAllBlocks(TextRange textRange) { |
| BlockIndex begin = EMPTY_BLOCK; |
| BlockIndex end = EMPTY_BLOCK; |
| for (size_t index = 0; index < fTextStyles.size(); ++index) { |
| auto& block = fTextStyles[index]; |
| if (block.fRange.end <= textRange.start) { |
| continue; |
| } |
| if (block.fRange.start >= textRange.end) { |
| break; |
| } |
| if (begin == EMPTY_BLOCK) { |
| begin = index; |
| } |
| end = index; |
| } |
| |
| return { begin, end + 1 }; |
| } |
| |
| TextLine& ParagraphImpl::addLine(SkVector offset, |
| SkVector advance, |
| TextRange text, |
| TextRange textWithSpaces, |
| ClusterRange clusters, |
| ClusterRange clustersWithGhosts, |
| SkScalar widthWithSpaces, |
| LineMetrics sizes) { |
| // Define a list of styles that covers the line |
| auto blocks = findAllBlocks(text); |
| |
| return fLines.emplace_back(this, offset, advance, blocks, text, textWithSpaces, clusters, clustersWithGhosts, widthWithSpaces, sizes); |
| } |
| |
| // Returns a vector of bounding boxes that enclose all text between |
| // start and end glyph indexes, including start and excluding end |
| std::vector<TextBox> ParagraphImpl::getRectsForRange(unsigned start, |
| unsigned end, |
| RectHeightStyle rectHeightStyle, |
| RectWidthStyle rectWidthStyle) { |
| std::vector<TextBox> results; |
| if (start >= end || start > fTextSpan.size() || end == 0) { |
| return results; |
| } |
| |
| // Make sure the edges are set on the glyph edges |
| TextRange text; |
| const char* first = fTextSpan.begin(); |
| size_t startPos = 0; |
| while (startPos < start) { |
| ++startPos; |
| utf8_next(&first, fTextSpan.end()); |
| } |
| text.start = first - fTextSpan.begin(); |
| size_t endPos = startPos; |
| while (endPos < end) { |
| ++endPos; |
| utf8_next(&first, fTextSpan.end()); |
| } |
| text.end = first - fTextSpan.begin(); |
| |
| for (auto& line : fLines) { |
| auto lineText = line.textWithSpaces(); |
| auto intersect = lineText * text; |
| if (intersect.empty() && lineText.start != text.start) { |
| continue; |
| } |
| |
| SkScalar runOffset = 0; |
| if (lineText.start != intersect.start) { |
| TextRange before(lineText.start, intersect.start); |
| runOffset = line.iterateThroughRuns( |
| before, 0, true, |
| [](Run*, size_t, size_t, SkRect, SkScalar, bool) { return true; }); |
| } |
| auto firstBoxOnTheLine = results.size(); |
| auto paragraphTextDirection = paragraphStyle().getTextDirection(); |
| line.iterateThroughRuns( |
| intersect, |
| runOffset, |
| paragraphStyle().getTextAlign() != TextAlign::kJustify || &line == &fLines.back(), |
| [&results, &line, rectHeightStyle, this, paragraphTextDirection](Run* run, size_t pos, size_t size, SkRect clip, |
| SkScalar shift, bool clippingNeeded) { |
| |
| SkRect trailingSpaces = SkRect::MakeEmpty(); |
| auto spaces = clip.left() >= line.width() ? 0 : clip.right() - line.width(); |
| if (spaces > 0) { |
| // There are trailing spaces; let's make a special box for them |
| if (paragraphTextDirection == TextDirection::kRtl) { |
| trailingSpaces.fLeft = clip.fLeft - spaces; |
| trailingSpaces.fRight = clip.fLeft; |
| clip.fRight = line.width(); |
| } else if (clip.fRight < line.widthWithSpaces()){ |
| trailingSpaces.fLeft = line.width(); |
| trailingSpaces.fRight = clip.fRight; |
| clip.fRight = line.width(); |
| } |
| trailingSpaces.fTop = clip.fTop; |
| trailingSpaces.fBottom = clip.fBottom; |
| trailingSpaces.offset(line.offset()); |
| } |
| |
| clip.offset(line.offset()); |
| |
| if (rectHeightStyle == RectHeightStyle::kMax) { |
| // Mimicking TxtLib: clip.fTop = line.offset().fY + line.roundingDelta(); |
| clip.fBottom = line.offset().fY + line.height(); |
| |
| } else if (rectHeightStyle == RectHeightStyle::kIncludeLineSpacingTop) { |
| if (&line != &fLines.front()) { |
| clip.fTop -= line.sizes().runTop(run); |
| } |
| clip.fBottom -= line.sizes().runTop(run); |
| } else if (rectHeightStyle == RectHeightStyle::kIncludeLineSpacingMiddle) { |
| if (&line != &fLines.front()) { |
| clip.fTop -= line.sizes().runTop(run) / 2; |
| } |
| if (&line == &fLines.back()) { |
| clip.fBottom -= line.sizes().runTop(run); |
| } else { |
| clip.fBottom -= line.sizes().runTop(run) / 2; |
| } |
| } else if (rectHeightStyle == RectHeightStyle::kIncludeLineSpacingBottom) { |
| if (&line == &fLines.back()) { |
| clip.fBottom -= line.sizes().runTop(run); |
| } |
| } |
| |
| results.emplace_back( |
| clip, run->leftToRight() ? TextDirection::kLtr : TextDirection::kRtl); |
| |
| if (trailingSpaces.width() > 0) { |
| results.emplace_back(trailingSpaces, paragraphTextDirection); |
| } |
| |
| return true; |
| }); |
| |
| if (rectWidthStyle == RectWidthStyle::kMax) { |
| // Align the very left/right box horizontally |
| auto lineStart = line.offset().fX; |
| auto lineEnd = line.offset().fX + line.width(); |
| auto left = results.front(); |
| auto right = results.back(); |
| if (left.rect.fLeft > lineStart && left.direction == TextDirection::kRtl) { |
| left.rect.fRight = left.rect.fLeft; |
| left.rect.fLeft = 0; |
| results.insert(results.begin() + firstBoxOnTheLine + 1, left); |
| } |
| if (right.direction == TextDirection::kLtr && |
| right.rect.fRight >= lineEnd && right.rect.fRight < this->fMaxWidthWithTrailingSpaces) { |
| right.rect.fLeft = right.rect.fRight; |
| right.rect.fRight = this->fMaxWidthWithTrailingSpaces; |
| results.emplace_back(right); |
| } |
| } |
| } |
| |
| return results; |
| } |
| // TODO: Deal with RTL here |
| PositionWithAffinity ParagraphImpl::getGlyphPositionAtCoordinate(SkScalar dx, SkScalar dy) { |
| PositionWithAffinity result(0, Affinity::kDownstream); |
| for (auto& line : fLines) { |
| // This is so far the the line vertically closest to our coordinates |
| // (or the first one, or the only one - all the same) |
| line.iterateThroughRuns( |
| line.textWithSpaces(), |
| 0, |
| true, |
| [dx, &result](Run* run, size_t pos, size_t size, SkRect clip, SkScalar shift, |
| bool clippingNeeded) { |
| if (dx < clip.fLeft) { |
| // All the other runs are placed right of this one |
| result = {SkToS32(run->fClusterIndexes[pos]), kDownstream}; |
| return false; |
| } |
| |
| if (dx >= clip.fRight) { |
| // We have to keep looking but just in case keep the last one as the closes |
| // so far |
| result = {SkToS32(run->fClusterIndexes[pos + size - 1]) + 1, kUpstream}; |
| return true; |
| } |
| |
| // So we found the run that contains our coordinates |
| size_t found = pos; |
| for (size_t i = pos; i < pos + size; ++i) { |
| if (run->positionX(i) + shift > dx) { |
| break; |
| } |
| found = i; |
| } |
| |
| if (found == pos + size - 1) { |
| result = {SkToS32(run->fClusterIndexes[found]), kUpstream}; |
| } else { |
| auto center = (run->positionX(found + 1) + run->positionX(found)) / 2; |
| if ((dx <= center + shift) == run->leftToRight()) { |
| result = {SkToS32(run->fClusterIndexes[found]), kDownstream}; |
| } else { |
| result = {SkToS32(run->fClusterIndexes[found + 1]), kUpstream}; |
| } |
| } |
| // No need to continue |
| return false; |
| }); |
| |
| // Let's figure out if we can stop looking |
| auto offsetY = line.offset().fY; |
| if (dy < offsetY) { |
| // The closest position on this line; next line is going to be even lower |
| break; |
| } |
| if (dy >= offsetY + line.height()) { |
| // We have the closest position on the lowest line so far, but we have to continue |
| continue; |
| } |
| |
| // We hit the line; nothing else to do |
| break; |
| } |
| |
| // SkDebugf("getGlyphPositionAtCoordinate(%f,%f) = %d\n", dx, dy, result.position); |
| return result; |
| } |
| |
| // Finds the first and last glyphs that define a word containing |
| // the glyph at index offset. |
| // By "glyph" they mean a character index - indicated by Minikin's code |
| SkRange<size_t> ParagraphImpl::getWordBoundary(unsigned offset) { |
| TextBreaker breaker; |
| if (!breaker.initialize(fTextSpan, UBRK_WORD)) { |
| return {0, 0}; |
| } |
| |
| size_t currentPos = breaker.first(); |
| while (true) { |
| auto start = currentPos; |
| currentPos = breaker.next(); |
| if (breaker.eof()) { |
| break; |
| } |
| if (start <= offset && currentPos > offset) { |
| return {start, currentPos}; |
| } |
| } |
| return {0, 0}; |
| } |
| |
| SkSpan<const char> ParagraphImpl::text(TextRange textRange) { |
| SkASSERT(textRange.start < fText.size() && textRange.end <= fText.size()); |
| return SkSpan<const char>(&fText[textRange.start], textRange.width()); |
| } |
| |
| SkSpan<Cluster> ParagraphImpl::clusters(ClusterRange clusterRange) { |
| SkASSERT(clusterRange.start < fClusters.size() && clusterRange.end <= fClusters.size()); |
| return SkSpan<Cluster>(&fClusters[clusterRange.start], clusterRange.width()); |
| } |
| |
| Cluster& ParagraphImpl::cluster(ClusterIndex clusterIndex) { |
| SkASSERT(clusterIndex < fClusters.size()); |
| return fClusters[clusterIndex]; |
| } |
| |
| Run& ParagraphImpl::run(RunIndex runIndex) { |
| SkASSERT(runIndex < fRuns.size()); |
| return fRuns[runIndex]; |
| } |
| |
| SkSpan<Block> ParagraphImpl::blocks(BlockRange blockRange) { |
| SkASSERT(blockRange.start < fTextStyles.size() && blockRange.end <= fTextStyles.size()); |
| return SkSpan<Block>(&fTextStyles[blockRange.start], blockRange.width()); |
| } |
| |
| Block& ParagraphImpl::block(BlockIndex blockIndex) { |
| SkASSERT(blockIndex < fTextStyles.size()); |
| return fTextStyles[blockIndex]; |
| } |
| |
| void ParagraphImpl::resetRunShifts() { |
| fRunShifts.reset(); |
| fRunShifts.push_back_n(fRuns.size(), RunShifts()); |
| for (size_t i = 0; i < fRuns.size(); ++i) { |
| fRunShifts[i].fShifts.push_back_n(fRuns[i].size() + 1, 0.0); |
| } |
| } |
| |
| void ParagraphImpl::setState(InternalState state) { |
| if (fState <= state) { |
| fState = state; |
| return; |
| } |
| |
| fState = state; |
| switch (fState) { |
| case kUnknown: |
| fRuns.reset(); |
| case kShaped: |
| fClusters.reset(); |
| case kClusterized: |
| case kMarked: |
| case kLineBroken: |
| this->resetContext(); |
| this->resolveStrut(); |
| this->resetRunShifts(); |
| fLines.reset(); |
| case kFormatted: |
| fPicture = nullptr; |
| case kDrawn: |
| break; |
| default: |
| break; |
| } |
| |
| } |
| |
| } // namespace textlayout |
| } // namespace skia |