| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "config.h" |
| #include "core/paint/InlineTextBoxPainter.h" |
| |
| #include "core/editing/CompositionUnderline.h" |
| #include "core/editing/Editor.h" |
| #include "core/editing/markers/DocumentMarkerController.h" |
| #include "core/editing/markers/RenderedDocumentMarker.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/layout/LayoutBlock.h" |
| #include "core/layout/LayoutTextCombine.h" |
| #include "core/layout/LayoutTheme.h" |
| #include "core/layout/api/LineLayoutBox.h" |
| #include "core/layout/api/LineLayoutText.h" |
| #include "core/layout/line/InlineTextBox.h" |
| #include "core/paint/BoxPainter.h" |
| #include "core/paint/LineLayoutPaintShim.h" |
| #include "core/paint/PaintInfo.h" |
| #include "core/paint/TextPainter.h" |
| #include "platform/graphics/GraphicsContextStateSaver.h" |
| #include "platform/graphics/paint/DrawingRecorder.h" |
| #include "wtf/Optional.h" |
| |
| namespace blink { |
| |
| typedef WTF::HashMap<const InlineTextBox*, TextBlobPtr> InlineTextBoxBlobCacheMap; |
| static InlineTextBoxBlobCacheMap* gTextBlobCache; |
| |
| static const int misspellingLineThickness = 3; |
| |
| void InlineTextBoxPainter::removeFromTextBlobCache(const InlineTextBox& inlineTextBox) |
| { |
| if (gTextBlobCache) |
| gTextBlobCache->remove(&inlineTextBox); |
| } |
| |
| static TextBlobPtr* addToTextBlobCache(const InlineTextBox& inlineTextBox) |
| { |
| if (!gTextBlobCache) |
| gTextBlobCache = new InlineTextBoxBlobCacheMap; |
| return &gTextBlobCache->add(&inlineTextBox, nullptr).storedValue->value; |
| } |
| |
| static bool paintsMarkerHighlights(const LayoutObject& layoutObject) |
| { |
| return layoutObject.node() && layoutObject.document().markers().hasMarkers(layoutObject.node()); |
| } |
| |
| static bool paintsCompositionMarkers(const LayoutObject& layoutObject) |
| { |
| return layoutObject.node() && layoutObject.document().markers().markersFor(layoutObject.node(), DocumentMarker::Composition).size() > 0; |
| } |
| |
| void InlineTextBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
| { |
| if (!shouldPaintTextBox(paintInfo)) |
| return; |
| |
| ASSERT(paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines); |
| |
| LayoutRect logicalVisualOverflow = m_inlineTextBox.logicalOverflowRect(); |
| LayoutUnit logicalStart = logicalVisualOverflow.x() + (m_inlineTextBox.isHorizontal() ? paintOffset.x() : paintOffset.y()); |
| LayoutUnit logicalExtent = logicalVisualOverflow.width(); |
| |
| // We round the y-axis to ensure consistent line heights. |
| LayoutPoint adjustedPaintOffset = LayoutPoint(paintOffset.x(), paintOffset.y().round()); |
| |
| if (m_inlineTextBox.isHorizontal()) { |
| if (!paintInfo.cullRect().intersectsHorizontalRange(logicalStart, logicalStart + logicalExtent)) |
| return; |
| } else { |
| if (!paintInfo.cullRect().intersectsVerticalRange(logicalStart, logicalStart + logicalExtent)) |
| return; |
| } |
| |
| bool isPrinting = paintInfo.isPrinting(); |
| |
| // Determine whether or not we're selected. |
| bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && m_inlineTextBox.selectionState() != SelectionNone; |
| if (!haveSelection && paintInfo.phase == PaintPhaseSelection) { |
| // When only painting the selection, don't bother to paint if there is none. |
| return; |
| } |
| |
| // The text clip phase already has a LayoutObjectDrawingRecorder. Text clips are initiated only in BoxPainter::paintLayerExtended, |
| // which is already within a LayoutObjectDrawingRecorder. |
| Optional<DrawingRecorder> drawingRecorder; |
| if (paintInfo.phase != PaintPhaseTextClip) { |
| if (DrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_inlineTextBox, DisplayItem::paintPhaseToDrawingType(paintInfo.phase))) |
| return; |
| LayoutRect paintRect(logicalVisualOverflow); |
| m_inlineTextBox.logicalRectToPhysicalRect(paintRect); |
| if (paintInfo.phase != PaintPhaseSelection && (haveSelection || paintsMarkerHighlights(*LineLayoutPaintShim::layoutObjectFrom(m_inlineTextBox.lineLayoutItem())))) |
| paintRect.unite(m_inlineTextBox.localSelectionRect(m_inlineTextBox.start(), m_inlineTextBox.start() + m_inlineTextBox.len())); |
| paintRect.moveBy(adjustedPaintOffset); |
| drawingRecorder.emplace(*paintInfo.context, m_inlineTextBox, DisplayItem::paintPhaseToDrawingType(paintInfo.phase), FloatRect(paintRect)); |
| } |
| |
| if (m_inlineTextBox.truncation() != cNoTruncation) { |
| if (m_inlineTextBox.lineLayoutItem().containingBlock().style()->isLeftToRightDirection() != m_inlineTextBox.isLeftToRightDirection()) { |
| // Make the visible fragment of text hug the edge closest to the rest of the run by moving the origin |
| // at which we start drawing text. |
| // e.g. In the case of LTR text truncated in an RTL Context, the correct behavior is: |
| // |Hello|CBA| -> |...He|CBA| |
| // In order to draw the fragment "He" aligned to the right edge of it's box, we need to start drawing |
| // farther to the right. |
| // NOTE: WebKit's behavior differs from that of IE which appears to just overlay the ellipsis on top of the |
| // truncated string i.e. |Hello|CBA| -> |...lo|CBA| |
| LayoutUnit widthOfVisibleText = m_inlineTextBox.lineLayoutItem().width(m_inlineTextBox.start(), m_inlineTextBox.truncation(), m_inlineTextBox.textPos(), m_inlineTextBox.isLeftToRightDirection() ? LTR : RTL, m_inlineTextBox.isFirstLineStyle()); |
| LayoutUnit widthOfHiddenText = m_inlineTextBox.logicalWidth() - widthOfVisibleText; |
| // FIXME: The hit testing logic also needs to take this translation into account. |
| LayoutSize truncationOffset(m_inlineTextBox.isLeftToRightDirection() ? widthOfHiddenText : -widthOfHiddenText, 0); |
| adjustedPaintOffset.move(m_inlineTextBox.isHorizontal() ? truncationOffset : truncationOffset.transposedSize()); |
| } |
| } |
| |
| GraphicsContext* context = paintInfo.context; |
| const ComputedStyle& styleToUse = m_inlineTextBox.lineLayoutItem().styleRef(m_inlineTextBox.isFirstLineStyle()); |
| |
| LayoutPoint boxOrigin(m_inlineTextBox.locationIncludingFlipping()); |
| boxOrigin.move(adjustedPaintOffset.x(), adjustedPaintOffset.y()); |
| LayoutRect boxRect(boxOrigin, LayoutSize(m_inlineTextBox.logicalWidth(), m_inlineTextBox.logicalHeight())); |
| |
| bool shouldRotate = false; |
| LayoutTextCombine* combinedText = nullptr; |
| if (!m_inlineTextBox.isHorizontal()) { |
| if (styleToUse.hasTextCombine() && m_inlineTextBox.lineLayoutItem().isCombineText()) { |
| combinedText = &toLayoutTextCombine(*LineLayoutPaintShim::layoutObjectFrom(m_inlineTextBox.lineLayoutItem())); |
| if (!combinedText->isCombined()) |
| combinedText = nullptr; |
| } |
| if (combinedText) { |
| combinedText->updateFont(); |
| boxRect.setWidth(combinedText->inlineWidthForLayout()); |
| } else { |
| shouldRotate = true; |
| context->concatCTM(TextPainter::rotation(boxRect, TextPainter::Clockwise)); |
| } |
| } |
| |
| // Determine text colors. |
| const LayoutObject& textBoxLayoutObject = *LineLayoutPaintShim::layoutObjectFrom(m_inlineTextBox.lineLayoutItem()); |
| TextPainter::Style textStyle = TextPainter::textPaintingStyle(textBoxLayoutObject, styleToUse, paintInfo); |
| TextPainter::Style selectionStyle = TextPainter::selectionPaintingStyle(textBoxLayoutObject, haveSelection, paintInfo, textStyle); |
| bool paintSelectedTextOnly = (paintInfo.phase == PaintPhaseSelection); |
| bool paintSelectedTextSeparately = !paintSelectedTextOnly && textStyle != selectionStyle; |
| |
| // Set our font. |
| const Font& font = styleToUse.font(); |
| |
| LayoutPoint textOrigin(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent()); |
| |
| // 1. Paint backgrounds behind text if needed. Examples of such backgrounds include selection |
| // and composition highlights. |
| if (paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && !isPrinting) { |
| paintDocumentMarkers(context, boxOrigin, styleToUse, font, true); |
| |
| if (haveSelection && !paintsCompositionMarkers(textBoxLayoutObject)) { |
| if (combinedText) |
| paintSelection<InlineTextBoxPainter::PaintOptions::CombinedText>(context, boxRect, styleToUse, font, selectionStyle.fillColor, combinedText); |
| else |
| paintSelection<InlineTextBoxPainter::PaintOptions::Normal>(context, boxRect, styleToUse, font, selectionStyle.fillColor); |
| } |
| } |
| |
| // 2. Now paint the foreground, including text and decorations like underline/overline (in quirks mode only). |
| int length = m_inlineTextBox.len(); |
| StringView string = m_inlineTextBox.lineLayoutItem().text().createView(); |
| ASSERT(m_inlineTextBox.start() + length <= string.length()); |
| if (static_cast<unsigned>(length) != string.length() || m_inlineTextBox.start()) |
| string.narrow(m_inlineTextBox.start(), length); |
| int maximumLength = m_inlineTextBox.lineLayoutItem().textLength() - m_inlineTextBox.start(); |
| |
| StringBuilder charactersWithHyphen; |
| TextRun textRun = m_inlineTextBox.constructTextRun(styleToUse, font, string, maximumLength, m_inlineTextBox.hasHyphen() ? &charactersWithHyphen : 0); |
| if (m_inlineTextBox.hasHyphen()) |
| length = textRun.length(); |
| |
| int selectionStart = 0; |
| int selectionEnd = 0; |
| if (paintSelectedTextOnly || paintSelectedTextSeparately) |
| m_inlineTextBox.selectionStartEnd(selectionStart, selectionEnd); |
| |
| bool respectHyphen = selectionEnd == static_cast<int>(m_inlineTextBox.len()) && m_inlineTextBox.hasHyphen(); |
| if (respectHyphen) |
| selectionEnd = textRun.length(); |
| |
| if (m_inlineTextBox.truncation() != cNoTruncation) { |
| selectionStart = std::min<int>(selectionStart, m_inlineTextBox.truncation()); |
| selectionEnd = std::min<int>(selectionEnd, m_inlineTextBox.truncation()); |
| length = m_inlineTextBox.truncation(); |
| } |
| |
| TextPainter textPainter(context, font, textRun, textOrigin, boxRect, m_inlineTextBox.isHorizontal()); |
| TextEmphasisPosition emphasisMarkPosition; |
| bool hasTextEmphasis = m_inlineTextBox.getEmphasisMarkPosition(styleToUse, emphasisMarkPosition); |
| if (hasTextEmphasis) |
| textPainter.setEmphasisMark(styleToUse.textEmphasisMarkString(), emphasisMarkPosition); |
| if (combinedText) |
| textPainter.setCombinedText(combinedText); |
| |
| if (!paintSelectedTextOnly) { |
| // FIXME: Truncate right-to-left text correctly. |
| int startOffset = 0; |
| int endOffset = length; |
| if (paintSelectedTextSeparately && selectionStart < selectionEnd) { |
| startOffset = selectionEnd; |
| endOffset = selectionStart; |
| } |
| |
| // FIXME: This cache should probably ultimately be held somewhere else. |
| // A hashmap is convenient to avoid a memory hit when the |
| // RuntimeEnabledFeature is off. |
| bool textBlobIsCacheable = startOffset == 0 && endOffset == length; |
| TextBlobPtr* cachedTextBlob = 0; |
| if (textBlobIsCacheable) |
| cachedTextBlob = addToTextBlobCache(m_inlineTextBox); |
| textPainter.paint(startOffset, endOffset, length, textStyle, cachedTextBlob); |
| } |
| |
| if ((paintSelectedTextOnly || paintSelectedTextSeparately) && selectionStart < selectionEnd) { |
| // paint only the text that is selected |
| bool textBlobIsCacheable = selectionStart == 0 && selectionEnd == length; |
| TextBlobPtr* cachedTextBlob = 0; |
| if (textBlobIsCacheable) |
| cachedTextBlob = addToTextBlobCache(m_inlineTextBox); |
| textPainter.paint(selectionStart, selectionEnd, length, selectionStyle, cachedTextBlob); |
| } |
| |
| // Paint decorations |
| TextDecoration textDecorations = styleToUse.textDecorationsInEffect(); |
| if (textDecorations != TextDecorationNone && !paintSelectedTextOnly) { |
| GraphicsContextStateSaver stateSaver(*context, false); |
| TextPainter::updateGraphicsContext(context, textStyle, m_inlineTextBox.isHorizontal(), stateSaver); |
| if (combinedText) |
| context->concatCTM(TextPainter::rotation(boxRect, TextPainter::Clockwise)); |
| paintDecoration(paintInfo, boxOrigin, textDecorations); |
| if (combinedText) |
| context->concatCTM(TextPainter::rotation(boxRect, TextPainter::Counterclockwise)); |
| } |
| |
| if (paintInfo.phase == PaintPhaseForeground) |
| paintDocumentMarkers(context, boxOrigin, styleToUse, font, false); |
| |
| if (shouldRotate) |
| context->concatCTM(TextPainter::rotation(boxRect, TextPainter::Counterclockwise)); |
| } |
| |
| bool InlineTextBoxPainter::shouldPaintTextBox(const PaintInfo& paintInfo) |
| { |
| // When painting selection, we want to include a highlight when the |
| // selection spans line breaks. In other cases such as invisible elements |
| // or those with no text that are not line breaks, we can skip painting |
| // wholesale. |
| // TODO(wkorman): Constrain line break painting to appropriate paint phase. |
| // This code path is only called in PaintPhaseForeground whereas we would |
| // expect PaintPhaseSelection. The existing haveSelection logic in paint() |
| // tests for != PaintPhaseTextClip. |
| bool paintLineBreaks = RuntimeEnabledFeatures::selectionPaintingWithoutSelectionGapsEnabled(); |
| if ((!paintLineBreaks && m_inlineTextBox.isLineBreak()) |
| || !paintInfo.shouldPaintWithinRoot(LineLayoutPaintShim::layoutObjectFrom(m_inlineTextBox.lineLayoutItem())) |
| || m_inlineTextBox.lineLayoutItem().style()->visibility() != VISIBLE |
| || m_inlineTextBox.truncation() == cFullTruncation |
| || !m_inlineTextBox.len()) |
| return false; |
| return true; |
| } |
| |
| unsigned InlineTextBoxPainter::underlinePaintStart(const CompositionUnderline& underline) |
| { |
| return std::max(static_cast<unsigned>(m_inlineTextBox.start()), underline.startOffset); |
| } |
| |
| unsigned InlineTextBoxPainter::underlinePaintEnd(const CompositionUnderline& underline) |
| { |
| unsigned paintEnd = std::min(m_inlineTextBox.end() + 1, underline.endOffset); // end() points at the last char, not past it. |
| if (m_inlineTextBox.truncation() != cNoTruncation) |
| paintEnd = std::min(paintEnd, static_cast<unsigned>(m_inlineTextBox.start() + m_inlineTextBox.truncation())); |
| return paintEnd; |
| } |
| |
| void InlineTextBoxPainter::paintSingleCompositionBackgroundRun(GraphicsContext* context, const LayoutPoint& boxOrigin, const ComputedStyle& style, const Font& font, Color backgroundColor, int startPos, int endPos) |
| { |
| if (backgroundColor == Color::transparent) |
| return; |
| |
| int sPos = std::max(startPos - static_cast<int>(m_inlineTextBox.start()), 0); |
| int ePos = std::min(endPos - static_cast<int>(m_inlineTextBox.start()), static_cast<int>(m_inlineTextBox.len())); |
| if (sPos >= ePos) |
| return; |
| |
| int deltaY = m_inlineTextBox.lineLayoutItem().style()->isFlippedLinesWritingMode() ? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom() : m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
| int selHeight = m_inlineTextBox.root().selectionHeight(); |
| FloatPoint localOrigin(boxOrigin.x().toFloat(), boxOrigin.y().toFloat() - deltaY); |
| context->drawHighlightForText(font, m_inlineTextBox.constructTextRun(style, font), localOrigin, selHeight, backgroundColor, sPos, ePos); |
| } |
| |
| void InlineTextBoxPainter::paintDocumentMarkers(GraphicsContext* pt, const LayoutPoint& boxOrigin, const ComputedStyle& style, const Font& font, bool background) |
| { |
| if (!m_inlineTextBox.lineLayoutItem().node()) |
| return; |
| |
| DocumentMarkerVector markers = m_inlineTextBox.lineLayoutItem().document().markers().markersFor(m_inlineTextBox.lineLayoutItem().node()); |
| DocumentMarkerVector::const_iterator markerIt = markers.begin(); |
| |
| // Give any document markers that touch this run a chance to draw before the text has been drawn. |
| // Note end() points at the last char, not one past it like endOffset and ranges do. |
| for ( ; markerIt != markers.end(); ++markerIt) { |
| DocumentMarker* marker = *markerIt; |
| |
| // Paint either the background markers or the foreground markers, but not both |
| switch (marker->type()) { |
| case DocumentMarker::Grammar: |
| case DocumentMarker::Spelling: |
| if (background) |
| continue; |
| break; |
| case DocumentMarker::TextMatch: |
| if (!background) |
| continue; |
| break; |
| case DocumentMarker::Composition: |
| break; |
| default: |
| continue; |
| } |
| |
| if (marker->endOffset() <= m_inlineTextBox.start()) { |
| // marker is completely before this run. This might be a marker that sits before the |
| // first run we draw, or markers that were within runs we skipped due to truncation. |
| continue; |
| } |
| if (marker->startOffset() > m_inlineTextBox.end()) { |
| // marker is completely after this run, bail. A later run will paint it. |
| break; |
| } |
| |
| // marker intersects this run. Paint it. |
| switch (marker->type()) { |
| case DocumentMarker::Spelling: |
| m_inlineTextBox.paintDocumentMarker(pt, boxOrigin, marker, style, font, false); |
| break; |
| case DocumentMarker::Grammar: |
| m_inlineTextBox.paintDocumentMarker(pt, boxOrigin, marker, style, font, true); |
| break; |
| case DocumentMarker::TextMatch: |
| m_inlineTextBox.paintTextMatchMarker(pt, boxOrigin, marker, style, font); |
| break; |
| case DocumentMarker::Composition: |
| { |
| CompositionUnderline underline(marker->startOffset(), marker->endOffset(), marker->underlineColor(), marker->thick(), marker->backgroundColor()); |
| if (background) |
| paintSingleCompositionBackgroundRun(pt, boxOrigin, style, font, underline.backgroundColor, underlinePaintStart(underline), underlinePaintEnd(underline)); |
| else |
| paintCompositionUnderline(pt, boxOrigin, underline); |
| } |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| } |
| |
| static GraphicsContext::DocumentMarkerLineStyle lineStyleForMarkerType(DocumentMarker::MarkerType markerType) |
| { |
| switch (markerType) { |
| case DocumentMarker::Spelling: |
| return GraphicsContext::DocumentMarkerSpellingLineStyle; |
| case DocumentMarker::Grammar: |
| return GraphicsContext::DocumentMarkerGrammarLineStyle; |
| default: |
| ASSERT_NOT_REACHED(); |
| return GraphicsContext::DocumentMarkerSpellingLineStyle; |
| } |
| } |
| |
| void InlineTextBoxPainter::paintDocumentMarker(GraphicsContext* pt, const LayoutPoint& boxOrigin, DocumentMarker* marker, const ComputedStyle& style, const Font& font, bool grammar) |
| { |
| // Never print spelling/grammar markers (5327887) |
| if (m_inlineTextBox.lineLayoutItem().document().printing()) |
| return; |
| |
| if (m_inlineTextBox.truncation() == cFullTruncation) |
| return; |
| |
| LayoutUnit start = 0; // start of line to draw, relative to tx |
| LayoutUnit width = m_inlineTextBox.logicalWidth(); // how much line to draw |
| |
| // Determine whether we need to measure text |
| bool markerSpansWholeBox = true; |
| if (m_inlineTextBox.start() <= marker->startOffset()) |
| markerSpansWholeBox = false; |
| if ((m_inlineTextBox.end() + 1) != marker->endOffset()) // end points at the last char, not past it |
| markerSpansWholeBox = false; |
| if (m_inlineTextBox.truncation() != cNoTruncation) |
| markerSpansWholeBox = false; |
| |
| if (!markerSpansWholeBox || grammar) { |
| int startPosition = std::max<int>(marker->startOffset() - m_inlineTextBox.start(), 0); |
| int endPosition = std::min<int>(marker->endOffset() - static_cast<int>(m_inlineTextBox.start()), m_inlineTextBox.len()); |
| |
| if (m_inlineTextBox.truncation() != cNoTruncation) |
| endPosition = std::min<int>(endPosition, m_inlineTextBox.truncation()); |
| |
| // Calculate start & width |
| int deltaY = m_inlineTextBox.lineLayoutItem().style()->isFlippedLinesWritingMode() ? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom() : m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
| int selHeight = m_inlineTextBox.root().selectionHeight(); |
| LayoutPoint startPoint(boxOrigin.x(), boxOrigin.y() - deltaY); |
| TextRun run = m_inlineTextBox.constructTextRun(style, font); |
| |
| // FIXME: Convert the document markers to float rects. |
| IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, FloatPoint(startPoint), selHeight, startPosition, endPosition)); |
| start = markerRect.x() - startPoint.x(); |
| width = markerRect.width(); |
| } |
| |
| // IMPORTANT: The misspelling underline is not considered when calculating the text bounds, so we have to |
| // make sure to fit within those bounds. This means the top pixel(s) of the underline will overlap the |
| // bottom pixel(s) of the glyphs in smaller font sizes. The alternatives are to increase the line spacing (bad!!) |
| // or decrease the underline thickness. The overlap is actually the most useful, and matches what AppKit does. |
| // So, we generally place the underline at the bottom of the text, but in larger fonts that's not so good so |
| // we pin to two pixels under the baseline. |
| int lineThickness = misspellingLineThickness; |
| int baseline = m_inlineTextBox.lineLayoutItem().style(m_inlineTextBox.isFirstLineStyle())->fontMetrics().ascent(); |
| int descent = m_inlineTextBox.logicalHeight() - baseline; |
| int underlineOffset; |
| if (descent <= (lineThickness + 2)) { |
| // Place the underline at the very bottom of the text in small/medium fonts. |
| underlineOffset = m_inlineTextBox.logicalHeight() - lineThickness; |
| } else { |
| // In larger fonts, though, place the underline up near the baseline to prevent a big gap. |
| underlineOffset = baseline + 2; |
| } |
| pt->drawLineForDocumentMarker(FloatPoint((boxOrigin.x() + start).toFloat(), (boxOrigin.y() + underlineOffset).toFloat()), width.toFloat(), lineStyleForMarkerType(marker->type())); |
| } |
| |
| template <InlineTextBoxPainter::PaintOptions options> |
| void InlineTextBoxPainter::paintSelection(GraphicsContext* context, const LayoutRect& boxRect, const ComputedStyle& style, const Font& font, Color textColor, LayoutTextCombine* combinedText) |
| { |
| // See if we have a selection to paint at all. |
| int sPos, ePos; |
| m_inlineTextBox.selectionStartEnd(sPos, ePos); |
| if (sPos >= ePos) |
| return; |
| |
| Color c = m_inlineTextBox.lineLayoutItem().selectionBackgroundColor(); |
| if (!c.alpha()) |
| return; |
| |
| // If the text color ends up being the same as the selection background, invert the selection |
| // background. |
| if (textColor == c) |
| c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue()); |
| |
| // If the text is truncated, let the thing being painted in the truncation |
| // draw its own highlight. |
| int length = m_inlineTextBox.truncation() != cNoTruncation ? m_inlineTextBox.truncation() : m_inlineTextBox.len(); |
| StringView string = m_inlineTextBox.lineLayoutItem().text().createView(); |
| |
| if (string.length() != static_cast<unsigned>(length) || m_inlineTextBox.start()) |
| string.narrow(m_inlineTextBox.start(), length); |
| |
| StringBuilder charactersWithHyphen; |
| bool respectHyphen = ePos == length && m_inlineTextBox.hasHyphen(); |
| TextRun textRun = m_inlineTextBox.constructTextRun(style, font, string, m_inlineTextBox.lineLayoutItem().textLength() - m_inlineTextBox.start(), respectHyphen ? &charactersWithHyphen : 0); |
| if (respectHyphen) |
| ePos = textRun.length(); |
| |
| GraphicsContextStateSaver stateSaver(*context); |
| |
| if (options == InlineTextBoxPainter::PaintOptions::CombinedText) { |
| ASSERT(combinedText); |
| // We can't use the height of m_inlineTextBox because LayoutTextCombine's inlineTextBox is horizontal within vertical flow |
| LayoutRect clipRect(boxRect); |
| combinedText->transformLayoutRect(clipRect); |
| context->clip(FloatRect(clipRect)); |
| combinedText->transformToInlineCoordinates(*context, boxRect); |
| context->drawHighlightForText(font, textRun, FloatPoint(boxRect.location()), boxRect.height(), c, sPos, ePos); |
| return; |
| } |
| |
| LayoutUnit selectionBottom = m_inlineTextBox.root().selectionBottom(); |
| LayoutUnit selectionTop = m_inlineTextBox.root().selectionTopAdjustedForPrecedingBlock(); |
| |
| int deltaY = roundToInt(m_inlineTextBox.lineLayoutItem().style()->isFlippedLinesWritingMode() ? selectionBottom - m_inlineTextBox.logicalBottom() : m_inlineTextBox.logicalTop() - selectionTop); |
| int selHeight = std::max(0, roundToInt(selectionBottom - selectionTop)); |
| |
| FloatPoint localOrigin(boxRect.x().toFloat(), (boxRect.y() - deltaY).toFloat()); |
| LayoutRect selectionRect = LayoutRect(font.selectionRectForText(textRun, localOrigin, selHeight, sPos, ePos)); |
| if (m_inlineTextBox.hasWrappedSelectionNewline() |
| // For line breaks, just painting a selection where the line break itself is rendered is sufficient. |
| && !m_inlineTextBox.isLineBreak()) |
| expandToIncludeNewlineForSelection(selectionRect); |
| |
| // Line breaks report themselves as having zero width for layout purposes, |
| // and so will end up positioned at (0, 0), even though we paint their |
| // selection highlight with character width. For RTL then, we have to |
| // explicitly shift the selection rect over to paint in the right location. |
| if (!m_inlineTextBox.isLeftToRightDirection() && m_inlineTextBox.isLineBreak()) |
| selectionRect.move(-selectionRect.width(), 0); |
| |
| context->fillRect(FloatRect(selectionRect), c); |
| } |
| |
| void InlineTextBoxPainter::expandToIncludeNewlineForSelection(LayoutRect& rect) |
| { |
| FloatRectOutsets outsets = FloatRectOutsets(); |
| float spaceWidth = m_inlineTextBox.newlineSpaceWidth(); |
| if (m_inlineTextBox.isLeftToRightDirection()) |
| outsets.setRight(spaceWidth); |
| else |
| outsets.setLeft(spaceWidth); |
| rect.expand(outsets); |
| } |
| |
| static int computeUnderlineOffset(const TextUnderlinePosition underlinePosition, const FontMetrics& fontMetrics, const InlineTextBox* inlineTextBox, const float textDecorationThickness) |
| { |
| // Compute the gap between the font and the underline. Use at least one |
| // pixel gap, if underline is thick then use a bigger gap. |
| int gap = 0; |
| |
| // Underline position of zero means draw underline on Baseline Position, |
| // in Blink we need at least 1-pixel gap to adding following check. |
| // Positive underline Position means underline should be drawn above baselin e |
| // and negative value means drawing below baseline, negating the value as in Blink |
| // downward Y-increases. |
| |
| if (fontMetrics.underlinePosition()) |
| gap = -fontMetrics.underlinePosition(); |
| else |
| gap = std::max<int>(1, ceilf(textDecorationThickness / 2.f)); |
| |
| // FIXME: We support only horizontal text for now. |
| switch (underlinePosition) { |
| case TextUnderlinePositionAuto: |
| return fontMetrics.ascent() + gap; // Position underline near the alphabetic baseline. |
| case TextUnderlinePositionUnder: { |
| // Position underline relative to the under edge of the lowest element's content box. |
| const LayoutUnit offset = inlineTextBox->root().maxLogicalTop() - inlineTextBox->logicalTop(); |
| if (offset > 0) |
| return inlineTextBox->logicalHeight() + gap + offset; |
| return inlineTextBox->logicalHeight() + gap; |
| } |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return fontMetrics.ascent() + gap; |
| } |
| |
| static bool shouldSetDecorationAntialias(TextDecorationStyle decorationStyle) |
| { |
| return decorationStyle == TextDecorationStyleDotted || decorationStyle == TextDecorationStyleDashed; |
| } |
| |
| static bool shouldSetDecorationAntialias(TextDecorationStyle underline, TextDecorationStyle overline, TextDecorationStyle linethrough) |
| { |
| return shouldSetDecorationAntialias(underline) || shouldSetDecorationAntialias(overline) || shouldSetDecorationAntialias(linethrough); |
| } |
| |
| static StrokeStyle textDecorationStyleToStrokeStyle(TextDecorationStyle decorationStyle) |
| { |
| StrokeStyle strokeStyle = SolidStroke; |
| switch (decorationStyle) { |
| case TextDecorationStyleSolid: |
| strokeStyle = SolidStroke; |
| break; |
| case TextDecorationStyleDouble: |
| strokeStyle = DoubleStroke; |
| break; |
| case TextDecorationStyleDotted: |
| strokeStyle = DottedStroke; |
| break; |
| case TextDecorationStyleDashed: |
| strokeStyle = DashedStroke; |
| break; |
| case TextDecorationStyleWavy: |
| strokeStyle = WavyStroke; |
| break; |
| } |
| |
| return strokeStyle; |
| } |
| |
| static void adjustStepToDecorationLength(float& step, float& controlPointDistance, float length) |
| { |
| ASSERT(step > 0); |
| |
| if (length <= 0) |
| return; |
| |
| unsigned stepCount = static_cast<unsigned>(length / step); |
| |
| // Each Bezier curve starts at the same pixel that the previous one |
| // ended. We need to subtract (stepCount - 1) pixels when calculating the |
| // length covered to account for that. |
| float uncoveredLength = length - (stepCount * step - (stepCount - 1)); |
| float adjustment = uncoveredLength / stepCount; |
| step += adjustment; |
| controlPointDistance += adjustment; |
| } |
| |
| /* |
| * Draw one cubic Bezier curve and repeat the same pattern long the the decoration's axis. |
| * The start point (p1), controlPoint1, controlPoint2 and end point (p2) of the Bezier curve |
| * form a diamond shape: |
| * |
| * step |
| * |-----------| |
| * |
| * controlPoint1 |
| * + |
| * |
| * |
| * . . |
| * . . |
| * . . |
| * (x1, y1) p1 + . + p2 (x2, y2) - <--- Decoration's axis |
| * . . | |
| * . . | |
| * . . | controlPointDistance |
| * | |
| * | |
| * + - |
| * controlPoint2 |
| * |
| * |-----------| |
| * step |
| */ |
| static void strokeWavyTextDecoration(GraphicsContext* context, FloatPoint p1, FloatPoint p2, float strokeThickness) |
| { |
| context->adjustLineToPixelBoundaries(p1, p2, strokeThickness, context->strokeStyle()); |
| |
| Path path; |
| path.moveTo(p1); |
| |
| // Distance between decoration's axis and Bezier curve's control points. |
| // The height of the curve is based on this distance. Use a minimum of 6 pixels distance since |
| // the actual curve passes approximately at half of that distance, that is 3 pixels. |
| // The minimum height of the curve is also approximately 3 pixels. Increases the curve's height |
| // as strockThickness increases to make the curve looks better. |
| float controlPointDistance = 3 * std::max<float>(2, strokeThickness); |
| |
| // Increment used to form the diamond shape between start point (p1), control |
| // points and end point (p2) along the axis of the decoration. Makes the |
| // curve wider as strockThickness increases to make the curve looks better. |
| float step = 2 * std::max<float>(2, strokeThickness); |
| |
| bool isVerticalLine = (p1.x() == p2.x()); |
| |
| if (isVerticalLine) { |
| ASSERT(p1.x() == p2.x()); |
| |
| float xAxis = p1.x(); |
| float y1; |
| float y2; |
| |
| if (p1.y() < p2.y()) { |
| y1 = p1.y(); |
| y2 = p2.y(); |
| } else { |
| y1 = p2.y(); |
| y2 = p1.y(); |
| } |
| |
| adjustStepToDecorationLength(step, controlPointDistance, y2 - y1); |
| FloatPoint controlPoint1(xAxis + controlPointDistance, 0); |
| FloatPoint controlPoint2(xAxis - controlPointDistance, 0); |
| |
| for (float y = y1; y + 2 * step <= y2;) { |
| controlPoint1.setY(y + step); |
| controlPoint2.setY(y + step); |
| y += 2 * step; |
| path.addBezierCurveTo(controlPoint1, controlPoint2, FloatPoint(xAxis, y)); |
| } |
| } else { |
| ASSERT(p1.y() == p2.y()); |
| |
| float yAxis = p1.y(); |
| float x1; |
| float x2; |
| |
| if (p1.x() < p2.x()) { |
| x1 = p1.x(); |
| x2 = p2.x(); |
| } else { |
| x1 = p2.x(); |
| x2 = p1.x(); |
| } |
| |
| adjustStepToDecorationLength(step, controlPointDistance, x2 - x1); |
| FloatPoint controlPoint1(0, yAxis + controlPointDistance); |
| FloatPoint controlPoint2(0, yAxis - controlPointDistance); |
| |
| for (float x = x1; x + 2 * step <= x2;) { |
| controlPoint1.setX(x + step); |
| controlPoint2.setX(x + step); |
| x += 2 * step; |
| path.addBezierCurveTo(controlPoint1, controlPoint2, FloatPoint(x, yAxis)); |
| } |
| } |
| |
| context->setShouldAntialias(true); |
| context->strokePath(path); |
| } |
| |
| static void paintAppliedDecoration(GraphicsContext* context, FloatPoint start, float width, float doubleOffset, int wavyOffsetFactor, |
| LayoutObject::AppliedTextDecoration decoration, float thickness, bool antialiasDecoration, bool isPrinting) |
| { |
| context->setStrokeStyle(textDecorationStyleToStrokeStyle(decoration.style)); |
| context->setStrokeColor(decoration.color); |
| |
| switch (decoration.style) { |
| case TextDecorationStyleWavy: |
| strokeWavyTextDecoration(context, start + FloatPoint(0, doubleOffset * wavyOffsetFactor), start + FloatPoint(width, doubleOffset * wavyOffsetFactor), thickness); |
| break; |
| case TextDecorationStyleDotted: |
| case TextDecorationStyleDashed: |
| context->setShouldAntialias(antialiasDecoration); |
| // Fall through |
| default: |
| context->drawLineForText(FloatPoint(start), width, isPrinting); |
| |
| if (decoration.style == TextDecorationStyleDouble) |
| context->drawLineForText(start + FloatPoint(0, doubleOffset), width, isPrinting); |
| } |
| } |
| |
| void InlineTextBoxPainter::paintDecoration(const PaintInfo& paintInfo, const LayoutPoint& boxOrigin, TextDecoration deco) |
| { |
| if (m_inlineTextBox.truncation() == cFullTruncation) |
| return; |
| |
| GraphicsContext* context = paintInfo.context; |
| GraphicsContextStateSaver stateSaver(*context); |
| |
| LayoutPoint localOrigin(boxOrigin); |
| |
| LayoutUnit width = m_inlineTextBox.logicalWidth(); |
| if (m_inlineTextBox.truncation() != cNoTruncation) { |
| width = m_inlineTextBox.lineLayoutItem().width(m_inlineTextBox.start(), m_inlineTextBox.truncation(), m_inlineTextBox.textPos(), m_inlineTextBox.isLeftToRightDirection() ? LTR : RTL, m_inlineTextBox.isFirstLineStyle()); |
| if (!m_inlineTextBox.isLeftToRightDirection()) |
| localOrigin.move(m_inlineTextBox.logicalWidth() - width, 0); |
| } |
| |
| // Get the text decoration colors. |
| LayoutObject::AppliedTextDecoration underline, overline, linethrough; |
| LayoutObject& textBoxLayoutObject = *LineLayoutPaintShim::layoutObjectFrom(m_inlineTextBox.lineLayoutItem()); |
| textBoxLayoutObject.getTextDecorations(deco, underline, overline, linethrough, true); |
| if (m_inlineTextBox.isFirstLineStyle()) |
| textBoxLayoutObject.getTextDecorations(deco, underline, overline, linethrough, true, true); |
| |
| // Use a special function for underlines to get the positioning exactly right. |
| bool isPrinting = paintInfo.isPrinting(); |
| |
| const ComputedStyle& styleToUse = textBoxLayoutObject.styleRef(m_inlineTextBox.isFirstLineStyle()); |
| float baseline = styleToUse.fontMetrics().ascent(); |
| |
| // Set the thick of the line to be 10% (or something else ?)of the computed font size and not less than 1px. |
| // Using computedFontSize should take care of zoom as well. |
| |
| // Update Underline thickness, in case we have Faulty Font Metrics calculating underline thickness by old method. |
| float textDecorationThickness = styleToUse.fontMetrics().underlineThickness(); |
| int fontHeightInt = (int)(styleToUse.fontMetrics().floatHeight() + 0.5); |
| if ((textDecorationThickness == 0.f) || (textDecorationThickness >= (fontHeightInt >> 1))) |
| textDecorationThickness = std::max(1.f, styleToUse.computedFontSize() / 10.f); |
| |
| context->setStrokeThickness(textDecorationThickness); |
| |
| bool antialiasDecoration = shouldSetDecorationAntialias(overline.style, underline.style, linethrough.style); |
| |
| // Offset between lines - always non-zero, so lines never cross each other. |
| float doubleOffset = textDecorationThickness + 1.f; |
| |
| if (deco & TextDecorationUnderline) { |
| const int underlineOffset = computeUnderlineOffset(styleToUse.textUnderlinePosition(), styleToUse.fontMetrics(), &m_inlineTextBox, textDecorationThickness); |
| paintAppliedDecoration(context, FloatPoint(localOrigin) + FloatPoint(0, underlineOffset), width.toFloat(), doubleOffset, 1, underline, textDecorationThickness, antialiasDecoration, isPrinting); |
| } |
| if (deco & TextDecorationOverline) { |
| paintAppliedDecoration(context, FloatPoint(localOrigin), width.toFloat(), -doubleOffset, 1, overline, textDecorationThickness, antialiasDecoration, isPrinting); |
| } |
| if (deco & TextDecorationLineThrough) { |
| const float lineThroughOffset = 2 * baseline / 3; |
| paintAppliedDecoration(context, FloatPoint(localOrigin) + FloatPoint(0, lineThroughOffset), width.toFloat(), doubleOffset, 0, linethrough, textDecorationThickness, antialiasDecoration, isPrinting); |
| } |
| } |
| |
| void InlineTextBoxPainter::paintCompositionUnderline(GraphicsContext* ctx, const LayoutPoint& boxOrigin, const CompositionUnderline& underline) |
| { |
| if (underline.color == Color::transparent) |
| return; |
| |
| if (m_inlineTextBox.truncation() == cFullTruncation) |
| return; |
| |
| unsigned paintStart = underlinePaintStart(underline); |
| unsigned paintEnd = underlinePaintEnd(underline); |
| |
| // start of line to draw, relative to paintOffset. |
| float start = paintStart == static_cast<unsigned>(m_inlineTextBox.start()) ? 0 : |
| m_inlineTextBox.lineLayoutItem().width(m_inlineTextBox.start(), paintStart - m_inlineTextBox.start(), m_inlineTextBox.textPos(), m_inlineTextBox.isLeftToRightDirection() ? LTR : RTL, m_inlineTextBox.isFirstLineStyle()); |
| // how much line to draw |
| float width = (paintStart == static_cast<unsigned>(m_inlineTextBox.start()) && paintEnd == static_cast<unsigned>(m_inlineTextBox.end()) + 1) ? m_inlineTextBox.logicalWidth().toFloat() : |
| m_inlineTextBox.lineLayoutItem().width(paintStart, paintEnd - paintStart, m_inlineTextBox.textPos() + start, m_inlineTextBox.isLeftToRightDirection() ? LTR : RTL, m_inlineTextBox.isFirstLineStyle()); |
| |
| // Thick marked text underlines are 2px thick as long as there is room for the 2px line under the baseline. |
| // All other marked text underlines are 1px thick. |
| // If there's not enough space the underline will touch or overlap characters. |
| int lineThickness = 1; |
| int baseline = m_inlineTextBox.lineLayoutItem().style(m_inlineTextBox.isFirstLineStyle())->fontMetrics().ascent(); |
| if (underline.thick && m_inlineTextBox.logicalHeight() - baseline >= 2) |
| lineThickness = 2; |
| |
| // We need to have some space between underlines of subsequent clauses, because some input methods do not use different underline styles for those. |
| // We make each line shorter, which has a harmless side effect of shortening the first and last clauses, too. |
| start += 1; |
| width -= 2; |
| |
| ctx->setStrokeColor(underline.color); |
| ctx->setStrokeThickness(lineThickness); |
| ctx->drawLineForText(FloatPoint(boxOrigin.x() + start, (boxOrigin.y() + m_inlineTextBox.logicalHeight() - lineThickness).toFloat()), width, m_inlineTextBox.lineLayoutItem().document().printing()); |
| } |
| |
| void InlineTextBoxPainter::paintTextMatchMarker(GraphicsContext* pt, const LayoutPoint& boxOrigin, DocumentMarker* marker, const ComputedStyle& style, const Font& font) |
| { |
| // Use same y positioning and height as for selection, so that when the selection and this highlight are on |
| // the same word there are no pieces sticking out. |
| int deltaY = m_inlineTextBox.lineLayoutItem().style()->isFlippedLinesWritingMode() ? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom() : m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
| int selHeight = m_inlineTextBox.root().selectionHeight(); |
| |
| int sPos = std::max(marker->startOffset() - m_inlineTextBox.start(), (unsigned)0); |
| int ePos = std::min(marker->endOffset() - m_inlineTextBox.start(), m_inlineTextBox.len()); |
| TextRun run = m_inlineTextBox.constructTextRun(style, font); |
| |
| // Optionally highlight the text |
| if (LineLayoutPaintShim::layoutObjectFrom(m_inlineTextBox.lineLayoutItem())->frame()->editor().markedTextMatchesAreHighlighted()) { |
| Color color = marker->activeMatch() ? |
| LayoutTheme::theme().platformActiveTextSearchHighlightColor() : |
| LayoutTheme::theme().platformInactiveTextSearchHighlightColor(); |
| GraphicsContextStateSaver stateSaver(*pt); |
| pt->clip(FloatRect(boxOrigin.x().toFloat(), (boxOrigin.y() - deltaY).toFloat(), m_inlineTextBox.logicalWidth().toFloat(), selHeight)); |
| pt->drawHighlightForText(font, run, FloatPoint(boxOrigin.x().toFloat(), (boxOrigin.y() - deltaY).toFloat()), selHeight, color, sPos, ePos); |
| |
| // Also Highlight the text with color:transparent |
| if (style.visitedDependentColor(CSSPropertyColor) == Color::transparent) { |
| int length = m_inlineTextBox.len(); |
| TextPainter::Style textStyle; |
| // When we use the text as a clip, we only care about the alpha, thus we make all the colors black. |
| textStyle.currentColor = textStyle.fillColor = textStyle.strokeColor = textStyle.emphasisMarkColor = Color::black; |
| textStyle.strokeWidth = style.textStrokeWidth(); |
| textStyle.shadow = 0; |
| |
| LayoutRect boxRect(boxOrigin, LayoutSize(m_inlineTextBox.logicalWidth(), m_inlineTextBox.logicalHeight())); |
| LayoutPoint textOrigin(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent()); |
| TextPainter textPainter(pt, font, run, textOrigin, boxRect, m_inlineTextBox.isHorizontal()); |
| |
| textPainter.paint(sPos, ePos, length, textStyle, 0); |
| } |
| } |
| } |
| |
| |
| } // namespace blink |
