| // Copyright 2019 Google LLC. |
| #include "modules/skparagraph/src/TextLine.h" |
| #include <unicode/brkiter.h> |
| #include <unicode/ubidi.h> |
| #include "modules/skparagraph/src/ParagraphImpl.h" |
| |
| #include "include/core/SkMaskFilter.h" |
| #include "include/effects/SkDashPathEffect.h" |
| #include "include/effects/SkDiscretePathEffect.h" |
| #include "src/core/SkMakeUnique.h" |
| |
| namespace skia { |
| namespace textlayout { |
| // TODO: deal with all the intersection functionality |
| int32_t intersectedSize(TextRange a, TextRange b) { |
| if (a.empty() || b.empty()) { |
| return -1; |
| } |
| auto begin = SkTMax(a.start, b.start); |
| auto end = SkTMin(a.end, b.end); |
| return begin <= end ? SkToS32(end - begin) : -1; |
| } |
| |
| TextRange intersected(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; |
| } |
| |
| TextLine::TextLine(ParagraphImpl* master, |
| SkVector offset, |
| SkVector advance, |
| BlockRange blocks, |
| TextRange text, |
| TextRange textWithSpaces, |
| ClusterRange clusters, |
| ClusterRange clustersWithGhosts, |
| SkScalar widthWithSpaces, |
| LineMetrics sizes) |
| : fMaster(master) |
| , fBlockRange(blocks) |
| , fTextRange(text) |
| , fTextWithWhitespacesRange(textWithSpaces) |
| , fClusterRange(clusters) |
| , fGhostClusterRange(clustersWithGhosts) |
| , fLogical() |
| , fAdvance(advance) |
| , fOffset(offset) |
| , fShift(0.0) |
| , fWidthWithSpaces(widthWithSpaces) |
| , fEllipsis(nullptr) |
| , fSizes(sizes) |
| , fHasBackground(false) |
| , fHasShadows(false) |
| , fHasDecorations(false) { |
| // Reorder visual runs |
| auto& start = master->cluster(fGhostClusterRange.start); |
| auto& end = master->cluster(fGhostClusterRange.end - 1); |
| size_t numRuns = end.runIndex() - start.runIndex() + 1; |
| |
| for (BlockIndex index = fBlockRange.start; index < fBlockRange.end; ++index) { |
| auto b = fMaster->styles().begin() + index; |
| if (b->fStyle.isPlaceholder()) { |
| continue; |
| } |
| if (b->fStyle.hasBackground()) { |
| fHasBackground = true; |
| } |
| if (b->fStyle.getDecorationType() != TextDecoration::kNoDecoration) { |
| fHasDecorations = true; |
| } |
| if (b->fStyle.getShadowNumber() > 0) { |
| fHasShadows = true; |
| } |
| } |
| |
| // Get the logical order |
| std::vector<UBiDiLevel> runLevels; |
| for (auto runIndex = start.runIndex(); runIndex <= end.runIndex(); ++runIndex) { |
| auto& run = fMaster->run(runIndex); |
| runLevels.emplace_back(run.fBidiLevel); |
| } |
| |
| std::vector<int32_t> logicalOrder(numRuns); |
| ubidi_reorderVisual(runLevels.data(), SkToU32(numRuns), logicalOrder.data()); |
| |
| auto firstRunIndex = start.runIndex(); |
| for (auto index : logicalOrder) { |
| fLogical.push_back(firstRunIndex + index); |
| } |
| } |
| |
| void TextLine::paint(SkCanvas* textCanvas) { |
| if (this->empty()) { |
| return; |
| } |
| |
| textCanvas->save(); |
| textCanvas->translate(this->offset().fX, this->offset().fY); |
| |
| if (fHasBackground) { |
| this->iterateThroughStylesInTextOrder( |
| StyleType::kBackground, |
| [this, textCanvas](TextRange textRange, const TextStyle& style, SkScalar offsetX) { |
| return this->paintBackground(textCanvas, textRange, style, offsetX); |
| }); |
| } |
| |
| if (fHasShadows) { |
| this->iterateThroughStylesInTextOrder( |
| StyleType::kShadow, |
| [textCanvas, this](TextRange textRange, const TextStyle& style, SkScalar offsetX) { |
| return this->paintShadow(textCanvas, textRange, style, offsetX); |
| }); |
| } |
| |
| this->iterateThroughStylesInTextOrder( |
| StyleType::kForeground, |
| [textCanvas, this](TextRange textRange, const TextStyle& style, SkScalar offsetX) { |
| return this->paintText(textCanvas, textRange, style, offsetX); |
| }); |
| |
| if (fHasDecorations) { |
| this->iterateThroughStylesInTextOrder( |
| StyleType::kDecorations, |
| [textCanvas, this](TextRange textRange, const TextStyle& style, SkScalar offsetX) { |
| return this->paintDecorations(textCanvas, textRange, style, offsetX); |
| }); |
| } |
| |
| textCanvas->restore(); |
| } |
| |
| void TextLine::format(TextAlign effectiveAlign, SkScalar maxWidth) { |
| SkScalar delta = maxWidth - this->width(); |
| if (delta <= 0) { |
| return; |
| } |
| |
| if (effectiveAlign == TextAlign::kJustify) { |
| this->justify(maxWidth); |
| } else if (effectiveAlign == TextAlign::kRight) { |
| fShift = delta; |
| } else if (effectiveAlign == TextAlign::kCenter) { |
| fShift = delta / 2; |
| } |
| } |
| |
| TextAlign TextLine::assumedTextAlign() const { |
| if (this->fMaster->paragraphStyle().getTextAlign() != TextAlign::kJustify) { |
| return this->fMaster->paragraphStyle().effective_align(); |
| } |
| |
| if (fClusterRange.empty()) { |
| return TextAlign::kLeft; |
| } else { |
| auto run = this->fMaster->cluster(fClusterRange.end - 1).run(); |
| return run->leftToRight() ? TextAlign::kLeft : TextAlign::kRight; |
| } |
| } |
| |
| void TextLine::scanStyles(StyleType style, const StyleVisitor& visitor) { |
| if (this->empty()) { |
| return; |
| } |
| |
| this->iterateThroughStylesInTextOrder( |
| style, [this, visitor](TextRange textRange, const TextStyle& style, SkScalar offsetX) { |
| visitor(textRange, style, offsetX); |
| return this->iterateThroughRuns( |
| textRange, offsetX, false, |
| [](Run*, int32_t, size_t, TextRange, SkRect, SkScalar, bool) { return true; }); |
| }); |
| } |
| |
| void TextLine::scanRuns(const RunVisitor& visitor) { |
| this->iterateThroughRuns( |
| fTextRange, 0, false, |
| [visitor](Run* run, int32_t pos, size_t size, TextRange text, SkRect clip, SkScalar sc, bool b) { |
| visitor(run, pos, size, text, clip, sc, b); |
| return true; |
| }); |
| } |
| |
| SkScalar TextLine::paintText(SkCanvas* canvas, TextRange textRange, const TextStyle& style, |
| SkScalar offsetX) const { |
| SkPaint paint; |
| if (style.hasForeground()) { |
| paint = style.getForeground(); |
| } else { |
| paint.setColor(style.getColor()); |
| } |
| |
| auto shiftDown = this->baseline(); |
| return this->iterateThroughRuns( |
| textRange, offsetX, false, |
| [canvas, paint, shiftDown](Run* run, int32_t pos, size_t size, TextRange, SkRect clip, SkScalar shift, bool clippingNeeded) { |
| if (run->placeholder() != nullptr) { |
| return true; |
| } |
| SkTextBlobBuilder builder; |
| run->copyTo(builder, SkToU32(pos), size, SkVector::Make(0, shiftDown)); |
| canvas->save(); |
| if (clippingNeeded) { |
| canvas->clipRect(clip); |
| } |
| canvas->translate(shift, 0); |
| canvas->drawTextBlob(builder.make(), 0, 0, paint); |
| canvas->restore(); |
| return true; |
| }); |
| } |
| |
| SkScalar TextLine::paintBackground(SkCanvas* canvas, TextRange textRange, |
| const TextStyle& style, SkScalar offsetX) const { |
| return this->iterateThroughRuns(textRange, offsetX, false, |
| [canvas, &style](Run* run, int32_t pos, size_t size, TextRange, SkRect clip, |
| SkScalar shift, bool clippingNeeded) { |
| if (style.hasBackground()) { |
| canvas->drawRect(clip, style.getBackground()); |
| } |
| return true; |
| }); |
| } |
| |
| SkScalar TextLine::paintShadow(SkCanvas* canvas, TextRange textRange, const TextStyle& style, |
| SkScalar offsetX) const { |
| auto shiftDown = this->baseline(); |
| auto result = this->iterateThroughRuns( |
| textRange, offsetX, false, |
| [canvas, shiftDown, &style](Run* run, size_t pos, size_t size, TextRange, SkRect clip, |
| SkScalar shift, bool clippingNeeded) { |
| for (TextShadow shadow : style.getShadows()) { |
| if (!shadow.hasShadow()) continue; |
| |
| SkPaint paint; |
| paint.setColor(shadow.fColor); |
| if (shadow.fBlurRadius != 0.0) { |
| auto filter = SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, |
| SkDoubleToScalar(shadow.fBlurRadius), false); |
| paint.setMaskFilter(filter); |
| } |
| |
| SkTextBlobBuilder builder; |
| run->copyTo(builder, pos, size, SkVector::Make(0, shiftDown)); |
| canvas->save(); |
| clip.offset(shadow.fOffset); |
| if (clippingNeeded) { |
| canvas->clipRect(clip); |
| } |
| canvas->translate(shift, 0); |
| canvas->drawTextBlob(builder.make(), shadow.fOffset.x(), shadow.fOffset.y(), |
| paint); |
| canvas->restore(); |
| } |
| return true; |
| }); |
| |
| return result; |
| } |
| |
| SkScalar TextLine::paintDecorations(SkCanvas* canvas, TextRange textRange, |
| const TextStyle& style, SkScalar offsetX) const { |
| return this->iterateThroughRuns( |
| textRange, offsetX, false, |
| [this, canvas, &style](Run* run, int32_t pos, size_t size, TextRange, SkRect clip, SkScalar shift, |
| bool clippingNeeded) { |
| if (style.getDecorationType() == TextDecoration::kNoDecoration) { |
| return true; |
| } |
| |
| for (auto decoration : AllTextDecorations) { |
| if ((style.getDecorationType() & decoration) == 0) { |
| continue; |
| } |
| |
| SkScalar thickness = computeDecorationThickness(style); |
| SkScalar position = computeDecorationPosition(style); |
| switch (decoration) { |
| case TextDecoration::kUnderline: |
| position = -run->correctAscent() + thickness; |
| break; |
| case TextDecoration::kOverline: |
| position = 0; |
| break; |
| case TextDecoration::kLineThrough: { |
| position = (run->correctDescent() - run->correctAscent() - thickness) / 2; |
| break; |
| } |
| default: |
| SkASSERT(false); |
| break; |
| } |
| |
| auto width = clip.width(); |
| SkScalar x = clip.left(); |
| SkScalar y = clip.top() + position; |
| |
| // Decoration paint (for now) and/or path |
| SkPaint paint; |
| SkPath path; |
| this->computeDecorationPaint(paint, clip, style, path); |
| paint.setStrokeWidth(thickness * style.getDecorationThicknessMultiplier()); |
| |
| switch (style.getDecorationStyle()) { |
| case TextDecorationStyle::kWavy: |
| path.offset(x, y); |
| canvas->drawPath(path, paint); |
| break; |
| case TextDecorationStyle::kDouble: { |
| canvas->drawLine(x, y, x + width, y, paint); |
| SkScalar bottom = y + thickness * 2; |
| canvas->drawLine(x, bottom, x + width, bottom, paint); |
| break; |
| } |
| case TextDecorationStyle::kDashed: |
| case TextDecorationStyle::kDotted: |
| case TextDecorationStyle::kSolid: |
| canvas->drawLine(x, y, x + width, y, paint); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| return true; |
| }); |
| } |
| |
| SkScalar TextLine::computeDecorationThickness(const TextStyle& style) const { |
| SkFontMetrics fontMetrics; |
| style.getFontMetrics(&fontMetrics); |
| if ((fontMetrics.fFlags & SkFontMetrics::FontMetricsFlags::kUnderlineThicknessIsValid_Flag) && |
| fontMetrics.fUnderlineThickness > 0) { |
| return fontMetrics.fUnderlineThickness; |
| } else { |
| return style.getFontSize() / 14.0f; |
| } |
| } |
| |
| SkScalar TextLine::computeDecorationPosition(const TextStyle& style) const { |
| SkFontMetrics fontMetrics; |
| style.getFontMetrics(&fontMetrics); |
| if ((fontMetrics.fFlags & SkFontMetrics::FontMetricsFlags::kUnderlinePositionIsValid_Flag) && |
| fontMetrics.fUnderlinePosition > 0) { |
| return fontMetrics.fUnderlinePosition; |
| } else { |
| return style.getFontSize() / 14.0f; |
| } |
| } |
| |
| void TextLine::computeDecorationPaint(SkPaint& paint, |
| SkRect clip, |
| const TextStyle& style, |
| SkPath& path) const { |
| paint.setStyle(SkPaint::kStroke_Style); |
| if (style.getDecorationColor() == SK_ColorTRANSPARENT) { |
| paint.setColor(style.getColor()); |
| } else { |
| paint.setColor(style.getDecorationColor()); |
| } |
| |
| SkScalar scaleFactor = style.getFontSize() / 14.f; |
| |
| switch (style.getDecorationStyle()) { |
| case TextDecorationStyle::kSolid: |
| break; |
| |
| case TextDecorationStyle::kDouble: |
| break; |
| |
| // Note: the intervals are scaled by the thickness of the line, so it is |
| // possible to change spacing by changing the decoration_thickness |
| // property of TextStyle. |
| case TextDecorationStyle::kDotted: { |
| const SkScalar intervals[] = {1.0f * scaleFactor, 1.5f * scaleFactor, |
| 1.0f * scaleFactor, 1.5f * scaleFactor}; |
| size_t count = sizeof(intervals) / sizeof(intervals[0]); |
| paint.setPathEffect(SkPathEffect::MakeCompose( |
| SkDashPathEffect::Make(intervals, (int32_t)count, 0.0f), |
| SkDiscretePathEffect::Make(0, 0))); |
| break; |
| } |
| // Note: the intervals are scaled by the thickness of the line, so it is |
| // possible to change spacing by changing the decoration_thickness |
| // property of TextStyle. |
| case TextDecorationStyle::kDashed: { |
| const SkScalar intervals[] = {4.0f * scaleFactor, 2.0f * scaleFactor, |
| 4.0f * scaleFactor, 2.0f * scaleFactor}; |
| size_t count = sizeof(intervals) / sizeof(intervals[0]); |
| paint.setPathEffect(SkPathEffect::MakeCompose( |
| SkDashPathEffect::Make(intervals, (int32_t)count, 0.0f), |
| SkDiscretePathEffect::Make(0, 0))); |
| break; |
| } |
| case TextDecorationStyle::kWavy: { |
| int wave_count = 0; |
| SkScalar x_start = 0; |
| SkScalar wavelength = scaleFactor * style.getDecorationThicknessMultiplier(); |
| auto width = clip.width(); |
| path.moveTo(0, 0); |
| while (x_start + wavelength * 2 < width) { |
| path.rQuadTo(wavelength, |
| wave_count % 2 != 0 ? wavelength : -wavelength, |
| wavelength * 2, |
| 0); |
| x_start += wavelength * 2; |
| ++wave_count; |
| } |
| break; |
| } |
| } |
| } |
| |
| void TextLine::justify(SkScalar maxWidth) { |
| // Count words and the extra spaces to spread across the line |
| // TODO: do it at the line breaking?.. |
| size_t whitespacePatches = 0; |
| SkScalar textLen = 0; |
| bool whitespacePatch = false; |
| this->iterateThroughClustersInGlyphsOrder(false, false, |
| [&whitespacePatches, &textLen, &whitespacePatch](const Cluster* cluster, ClusterIndex index, bool leftToRight, bool ghost) { |
| if (cluster->isWhitespaces()) { |
| if (!whitespacePatch) { |
| whitespacePatch = true; |
| ++whitespacePatches; |
| } |
| } else { |
| whitespacePatch = false; |
| } |
| textLen += cluster->width(); |
| return true; |
| }); |
| |
| if (whitespacePatches == 0) { |
| return; |
| } |
| |
| SkScalar step = (maxWidth - textLen) / whitespacePatches; |
| SkScalar shift = 0; |
| |
| // Deal with the ghost spaces |
| auto ghostShift = maxWidth - this->fAdvance.fX; |
| // Spread the extra whitespaces |
| whitespacePatch = false; |
| this->iterateThroughClustersInGlyphsOrder(false, true, [&](const Cluster* cluster, ClusterIndex index, bool leftToRight, bool ghost) { |
| |
| if (ghost) { |
| if (leftToRight) { |
| fMaster->shiftCluster(index, ghostShift); |
| } |
| return true; |
| } |
| |
| if (cluster->isWhitespaces()) { |
| if (!whitespacePatch) { |
| shift += step; |
| whitespacePatch = true; |
| --whitespacePatches; |
| } |
| } else { |
| whitespacePatch = false; |
| } |
| fMaster->shiftCluster(index, shift); |
| return true; |
| }); |
| |
| SkAssertResult(SkScalarNearlyEqual(shift, maxWidth - textLen)); |
| SkASSERT(whitespacePatches == 0); |
| |
| this->fWidthWithSpaces += ghostShift; |
| this->fAdvance.fX = maxWidth; |
| } |
| |
| void TextLine::createEllipsis(SkScalar maxWidth, const SkString& ellipsis, bool) { |
| // Replace some clusters with the ellipsis |
| // Go through the clusters in the reverse logical order |
| // taking off cluster by cluster until the ellipsis fits |
| SkScalar width = fAdvance.fX; |
| iterateThroughClustersInGlyphsOrder( |
| true, false, [this, &width, ellipsis, maxWidth](const Cluster* cluster, ClusterIndex index, bool leftToRight, bool ghost) { |
| if (cluster->isWhitespaces()) { |
| width -= cluster->width(); |
| return true; |
| } |
| |
| // Shape the ellipsis |
| Run* run = shapeEllipsis(ellipsis, cluster->run()); |
| run->setMaster(fMaster); |
| fEllipsis = std::make_shared<Run>(*run); |
| |
| // See if it fits |
| if (width + fEllipsis->advance().fX > maxWidth) { |
| width -= cluster->width(); |
| // Continue if it's not |
| return true; |
| } |
| |
| fEllipsis->shift(width, 0); |
| fAdvance.fX = width; |
| return false; |
| }); |
| } |
| |
| Run* TextLine::shapeEllipsis(const SkString& ellipsis, Run* run) { |
| |
| class ShapeHandler final : public SkShaper::RunHandler { |
| public: |
| ShapeHandler(SkScalar lineHeight, const SkString& ellipsis) |
| : fRun(nullptr), fLineHeight(lineHeight), fEllipsis(ellipsis) {} |
| Run* run() { return fRun; } |
| |
| private: |
| void beginLine() override {} |
| |
| void runInfo(const RunInfo&) override {} |
| |
| void commitRunInfo() override {} |
| |
| Buffer runBuffer(const RunInfo& info) override { |
| fRun = new Run(nullptr, info, 0, fLineHeight, 0, 0); |
| return fRun->newRunBuffer(); |
| } |
| |
| void commitRunBuffer(const RunInfo& info) override { |
| fRun->fAdvance.fX = info.fAdvance.fX; |
| fRun->fAdvance.fY = fRun->advance().fY; |
| fRun->fPlaceholder = nullptr; |
| } |
| |
| void commitLine() override {} |
| |
| Run* fRun; |
| SkScalar fLineHeight; |
| SkString fEllipsis; |
| }; |
| |
| ShapeHandler handler(run->lineHeight(), ellipsis); |
| std::unique_ptr<SkShaper> shaper = SkShaper::MakeShapeDontWrapOrReorder(); |
| SkASSERT_RELEASE(shaper != nullptr); |
| shaper->shape(ellipsis.c_str(), ellipsis.size(), run->font(), true, |
| std::numeric_limits<SkScalar>::max(), &handler); |
| handler.run()->fTextRange = TextRange(0, ellipsis.size()); |
| handler.run()->fMaster = fMaster; |
| return handler.run(); |
| } |
| |
| SkRect TextLine::measureTextInsideOneRun( |
| TextRange textRange, Run* run, size_t& pos, size_t& size, bool includeGhostSpaces, bool& clippingNeeded) const { |
| |
| SkASSERT(intersectedSize(run->textRange(), textRange) >= 0); |
| |
| if (run->placeholder() != nullptr) { |
| SkASSERT(textRange == run->textRange()); |
| pos = 0; |
| size = 1; |
| clippingNeeded = false; |
| return SkRect::MakeXYWH( |
| 0, sizes().runTop(run), run->calculateWidth(0, 1, false), run->calculateHeight()); |
| } |
| |
| // Find [start:end] clusters for the text |
| bool found; |
| ClusterIndex startIndex; |
| ClusterIndex endIndex; |
| std::tie(found, startIndex, endIndex) = run->findLimitingClusters(textRange); |
| if (!found) { |
| SkASSERT(textRange.empty()); |
| return SkRect::MakeEmpty(); |
| } |
| |
| auto start = fMaster->clusters().begin() + startIndex; |
| auto end = fMaster->clusters().begin() + endIndex; |
| pos = start->startPos(); |
| size = end->endPos() - start->startPos(); |
| |
| // Calculate the clipping rectangle for the text with cluster edges |
| // There are 2 cases: |
| // EOL (when we expect the last cluster clipped without any spaces) |
| // Anything else (when we want the cluster width contain all the spaces - |
| // coming from letter spacing or word spacing or justification) |
| auto range = includeGhostSpaces ? fGhostClusterRange : fClusterRange; |
| bool needsClipping = (run->leftToRight() ? endIndex == range.end - 1 : startIndex == range.end - 1); |
| SkRect clip = |
| SkRect::MakeXYWH(run->positionX(start->startPos()) - run->positionX(0), |
| sizes().runTop(run), |
| run->calculateWidth(start->startPos(), end->endPos(), needsClipping), |
| run->calculateHeight()); |
| |
| // Correct the width in case the text edges don't match clusters |
| // TODO: This is where we get smart about selecting a part of a cluster |
| // by shaping each grapheme separately and then use the result sizes |
| // to calculate the proportions |
| auto leftCorrection = start->sizeToChar(textRange.start); |
| auto rightCorrection = end->sizeFromChar(textRange.end - 1); |
| clip.fLeft += leftCorrection; |
| clip.fRight -= rightCorrection; |
| clippingNeeded = leftCorrection != 0 || rightCorrection != 0; |
| |
| return clip; |
| } |
| |
| void TextLine::iterateThroughClustersInGlyphsOrder(bool reverse, |
| bool includeGhosts, |
| const ClustersVisitor& visitor) const { |
| // Walk through the clusters in the logical order (or reverse) |
| for (size_t r = 0; r != fLogical.size(); ++r) { |
| auto& runIndex = fLogical[reverse ? fLogical.size() - r - 1 : r]; |
| auto run = this->fMaster->runs().begin() + runIndex; |
| auto start = SkTMax(run->clusterRange().start, fClusterRange.start); |
| auto end = SkTMin(run->clusterRange().end, fClusterRange.end); |
| auto ghosts = SkTMin(run->clusterRange().end, fGhostClusterRange.end); |
| |
| if (run->leftToRight() != reverse) { |
| for (auto index = start; index < ghosts; ++index) { |
| if (index >= end && !includeGhosts) { |
| break; |
| } |
| const auto& cluster = &fMaster->cluster(index); |
| if (!visitor(cluster, index, run->leftToRight(), index >= end)) { |
| return; |
| } |
| } |
| } else { |
| for (auto index = ghosts; index > start; --index) { |
| if (index > end && !includeGhosts) { |
| continue; |
| } |
| const auto& cluster = &fMaster->cluster(index - 1); |
| if (!visitor(cluster, index - 1, run->leftToRight(), index > end)) { |
| return; |
| } |
| } |
| } |
| } |
| } |
| |
| SkScalar TextLine::calculateLeftVisualOffset(TextRange textRange) const { |
| SkScalar partOfTheCurrentRun = 0; |
| return this->iterateThroughRuns(this->textWithSpaces(), 0, true, |
| [textRange, &partOfTheCurrentRun, this]( |
| Run* run, size_t pos, size_t size, TextRange text, |
| SkRect clip, SkScalar shift, bool clippingNeeded) { |
| if (text.start > textRange.start || text.end <= textRange.start) { |
| // This run does not even touch the text start |
| } else { |
| // This is the run |
| TextRange part; |
| if (run->leftToRight()) { |
| part = {text.start, textRange.start}; |
| } else if (textRange.end < text.end) { |
| part = {textRange.end, text.end}; |
| } |
| if (part.width() == 0) { |
| return false; |
| } |
| size_t pos; |
| size_t size; |
| bool clippingNeeded; |
| SkRect partClip = this->measureTextInsideOneRun(part, run, pos, size, true, clippingNeeded); |
| partOfTheCurrentRun = partClip.width(); |
| return false; |
| } |
| |
| return true; |
| }) + |
| partOfTheCurrentRun; |
| } |
| |
| // Walk through the runs in the logical order |
| SkScalar TextLine::iterateThroughRuns(TextRange textRange, |
| SkScalar runOffset, |
| bool includeGhostWhitespaces, |
| const RunVisitor& visitor) const { |
| TRACE_EVENT0("skia", TRACE_FUNC); |
| |
| SkScalar width = 0; |
| for (auto& runIndex : fLogical) { |
| const auto run = &this->fMaster->run(runIndex); |
| // Only skip the text if it does not even touch the run |
| auto intersection = intersectedSize(run->textRange(), textRange); |
| if (intersection < 0 || (intersection == 0 && textRange.end != run->textRange().end)) { |
| continue; |
| } |
| |
| auto intersect = intersected(run->textRange(), textRange); |
| if (run->textRange().empty() || intersect.empty()) { |
| continue; |
| } |
| |
| // Measure the text |
| size_t pos; |
| size_t size; |
| bool clippingNeeded; |
| SkRect clip = this->measureTextInsideOneRun(intersect, run, pos, size, includeGhostWhitespaces, clippingNeeded); |
| if (clip.height() == 0) { |
| continue; |
| } |
| |
| // Clip the text |
| auto shift = runOffset - clip.fLeft; |
| clip.offset(shift, 0); |
| if (includeGhostWhitespaces) { |
| clippingNeeded = false; |
| } else { |
| clippingNeeded = true; |
| if (clip.fRight > fAdvance.fX) { |
| clip.fRight = fAdvance.fX; |
| } |
| } |
| |
| if (!visitor(run, pos, size, intersect, clip, shift - run->positionX(0), clippingNeeded)) { |
| return width; |
| } |
| |
| if (run->leftToRight() || &runIndex == &fLogical.back()) { |
| width += clip.width(); |
| runOffset += clip.width(); |
| } else { |
| width += run->advance().fX; |
| runOffset += run->advance().fX; |
| } |
| |
| } |
| |
| if (this->ellipsis() != nullptr) { |
| auto ellipsis = this->ellipsis(); |
| if (!visitor(ellipsis, 0, ellipsis->size(), ellipsis->textRange(), ellipsis->clip(), ellipsis->clip().fLeft, |
| false)) { |
| return width; |
| } |
| width += ellipsis->clip().width(); |
| } |
| |
| return width; |
| } |
| |
| void TextLine::iterateThroughStylesInTextOrder(StyleType styleType, |
| const StyleVisitor& visitor) const { |
| |
| TextIndex start = EMPTY_INDEX; |
| size_t size = 0; |
| const TextStyle* prevStyle = nullptr; |
| |
| SkScalar offsetX = 0; |
| for (BlockIndex index = fBlockRange.start; index < fBlockRange.end; ++index) { |
| auto block = fMaster->styles().begin() + index; |
| auto intersect = intersected(block->fRange, this->trimmedText()); |
| if (intersect.empty()) { |
| if (start == EMPTY_INDEX) { |
| // This style is not applicable to the line |
| continue; |
| } else { |
| // We have found all the good styles already |
| break; |
| } |
| } |
| |
| auto& style = block->fStyle; |
| if (start != EMPTY_INDEX && style.matchOneAttribute(styleType, *prevStyle)) { |
| size += intersect.width(); |
| continue; |
| } else if (start == EMPTY_INDEX ) { |
| // First time only |
| prevStyle = &style; |
| size = intersect.width(); |
| start = intersect.start; |
| continue; |
| } |
| |
| auto width = visitor(TextRange(start, start + size), *prevStyle, offsetX); |
| offsetX += width; |
| |
| // Start all over again |
| prevStyle = &style; |
| start = intersect.start; |
| size = intersect.width(); |
| } |
| |
| if (prevStyle == nullptr) return; |
| |
| // The very last style |
| auto width = visitor(TextRange(start, start + size), *prevStyle, offsetX); |
| offsetX += width; |
| |
| // This is a very important assert! |
| // It asserts that 2 different ways of calculation come with the same results |
| if (!SkScalarNearlyEqual(offsetX, this->width())) { |
| SkDebugf("ASSERT: %f != %f\n", offsetX, this->width()); |
| } |
| SkASSERT(SkScalarNearlyEqual(offsetX, this->width())); |
| } |
| |
| SkVector TextLine::offset() const { |
| return fOffset + SkVector::Make(fShift, 0); |
| } |
| } // namespace textlayout |
| } // namespace skia |