Index: Source/core/paint/InlineTextBoxPainter.cpp |
diff --git a/Source/core/paint/InlineTextBoxPainter.cpp b/Source/core/paint/InlineTextBoxPainter.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4a8540bc812838f73f63b47af585db4712b12a78 |
--- /dev/null |
+++ b/Source/core/paint/InlineTextBoxPainter.cpp |
@@ -0,0 +1,791 @@ |
+// 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/dom/DocumentMarkerController.h" |
+#include "core/dom/RenderedDocumentMarker.h" |
+#include "core/editing/CompositionUnderline.h" |
+#include "core/editing/CompositionUnderlineRangeFilter.h" |
+#include "core/editing/Editor.h" |
+#include "core/editing/InputMethodController.h" |
+#include "core/frame/LocalFrame.h" |
+#include "core/paint/BoxPainter.h" |
+#include "core/rendering/InlineTextBox.h" |
+#include "core/rendering/PaintInfo.h" |
+#include "core/rendering/RenderBlock.h" |
+#include "core/rendering/RenderCombineText.h" |
+#include "core/rendering/RenderTheme.h" |
+#include "core/rendering/TextPainter.h" |
+ |
+namespace blink { |
+ |
+typedef WTF::HashMap<const InlineTextBox*, TextBlobPtr> InlineTextBoxBlobCacheMap; |
+static InlineTextBoxBlobCacheMap* gTextBlobCache; |
+ |
+static const int misspellingLineThickness = 3; |
+ |
+void InlineTextBoxPainter::removeFromTextBlobCache(InlineTextBox& inlineTextBox) |
+{ |
+ if (gTextBlobCache) |
+ gTextBlobCache->remove(&inlineTextBox); |
+} |
+ |
+void InlineTextBoxPainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
+{ |
+ if (m_inlineTextBox.isLineBreak() || !paintInfo.shouldPaintWithinRoot(&m_inlineTextBox.renderer()) || m_inlineTextBox.renderer().style()->visibility() != VISIBLE |
+ || m_inlineTextBox.truncation() == cFullTruncation || paintInfo.phase == PaintPhaseOutline || !m_inlineTextBox.len()) |
+ return; |
+ |
+ ASSERT(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(); |
+ |
+ LayoutUnit paintEnd = m_inlineTextBox.isHorizontal() ? paintInfo.rect.maxX() : paintInfo.rect.maxY(); |
+ LayoutUnit paintStart = m_inlineTextBox.isHorizontal() ? paintInfo.rect.x() : paintInfo.rect.y(); |
+ |
+ // When subpixel font scaling is enabled text runs are positioned at |
+ // subpixel boundaries on the x-axis and thus there is no reason to |
+ // snap the x value. We still round the y-axis to ensure consistent |
+ // line heights. |
+ LayoutPoint adjustedPaintOffset = RuntimeEnabledFeatures::subpixelFontScalingEnabled() |
+ ? LayoutPoint(paintOffset.x(), paintOffset.y().round()) |
+ : roundedIntPoint(paintOffset); |
+ |
+ if (logicalStart >= paintEnd || logicalStart + logicalExtent <= paintStart) |
+ return; |
+ |
+ bool isPrinting = m_inlineTextBox.renderer().document().printing(); |
+ |
+ // Determine whether or not we're selected. |
+ bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && m_inlineTextBox.selectionState() != RenderObject::SelectionNone; |
+ if (!haveSelection && paintInfo.phase == PaintPhaseSelection) { |
+ // When only painting the selection, don't bother to paint if there is none. |
+ return; |
+ } |
+ |
+ if (m_inlineTextBox.truncation() != cNoTruncation) { |
+ if (m_inlineTextBox.renderer().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.renderer().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; |
+ RenderStyle* styleToUse = m_inlineTextBox.renderer().style(m_inlineTextBox.isFirstLineStyle()); |
+ |
+ adjustedPaintOffset.move(0, styleToUse->isHorizontalWritingMode() ? 0 : -m_inlineTextBox.logicalHeight()); |
+ |
+ FloatPoint boxOrigin = m_inlineTextBox.locationIncludingFlipping(); |
+ boxOrigin.move(adjustedPaintOffset.x().toFloat(), adjustedPaintOffset.y().toFloat()); |
+ FloatRect boxRect(boxOrigin, LayoutSize(m_inlineTextBox.logicalWidth(), m_inlineTextBox.logicalHeight())); |
+ |
+ RenderCombineText* combinedText = styleToUse->hasTextCombine() && m_inlineTextBox.renderer().isCombineText() && toRenderCombineText(m_inlineTextBox.renderer()).isCombined() ? &toRenderCombineText(m_inlineTextBox.renderer()) : 0; |
+ |
+ bool shouldRotate = !m_inlineTextBox.isHorizontal() && !combinedText; |
+ if (shouldRotate) |
+ context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Clockwise)); |
+ |
+ // Determine whether or not we have composition underlines to draw. |
+ bool containsComposition = m_inlineTextBox.renderer().node() && m_inlineTextBox.renderer().frame()->inputMethodController().compositionNode() == m_inlineTextBox.renderer().node(); |
+ bool useCustomUnderlines = containsComposition && m_inlineTextBox.renderer().frame()->inputMethodController().compositionUsesCustomUnderlines(); |
+ |
+ // Determine text colors. |
+ TextPainter::Style textStyle = TextPainter::textPaintingStyle(m_inlineTextBox.renderer(), styleToUse, paintInfo.forceBlackText(), isPrinting); |
+ TextPainter::Style selectionStyle = TextPainter::selectionPaintingStyle(m_inlineTextBox.renderer(), haveSelection, paintInfo.forceBlackText(), isPrinting, textStyle); |
+ bool paintSelectedTextOnly = (paintInfo.phase == PaintPhaseSelection); |
+ bool paintSelectedTextSeparately = !paintSelectedTextOnly && textStyle != selectionStyle; |
+ |
+ // Set our font. |
+ const Font& font = styleToUse->font(); |
+ |
+ FloatPoint textOrigin = FloatPoint(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent()); |
+ if (combinedText) |
+ combinedText->adjustTextOrigin(textOrigin, boxRect); |
+ |
+ // 1. Paint backgrounds behind text if needed. Examples of such backgrounds include selection |
+ // and composition highlights. |
+ if (paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && !isPrinting) { |
+ if (containsComposition) { |
+ paintCompositionBackgrounds(context, boxOrigin, styleToUse, font, useCustomUnderlines); |
+ } |
+ |
+ paintDocumentMarkers(context, boxOrigin, styleToUse, font, true); |
+ |
+ if (haveSelection && !useCustomUnderlines) |
+ paintSelection(context, boxOrigin, 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(); |
+ int maximumLength; |
+ StringView string; |
+ if (!combinedText) { |
+ string = m_inlineTextBox.renderer().text().createView(); |
+ if (static_cast<unsigned>(length) != string.length() || m_inlineTextBox.start()) |
+ string.narrow(m_inlineTextBox.start(), length); |
+ maximumLength = m_inlineTextBox.renderer().textLength() - m_inlineTextBox.start(); |
+ } else { |
+ combinedText->getStringToRender(m_inlineTextBox.start(), string, length); |
+ maximumLength = length; |
+ } |
+ |
+ 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 = RuntimeEnabledFeatures::textBlobEnabled() && startOffset == 0 && endOffset == length; |
+ TextBlobPtr* cachedTextBlob = 0; |
+ if (textBlobIsCacheable) { |
+ if (!gTextBlobCache) |
+ gTextBlobCache = new InlineTextBoxBlobCacheMap; |
+ cachedTextBlob = &gTextBlobCache->add(&m_inlineTextBox, nullptr).storedValue->value; |
+ } |
+ textPainter.paint(startOffset, endOffset, length, textStyle, cachedTextBlob); |
+ } |
+ |
+ if ((paintSelectedTextOnly || paintSelectedTextSeparately) && selectionStart < selectionEnd) { |
+ // paint only the text that is selected |
+ textPainter.paint(selectionStart, selectionEnd, length, selectionStyle); |
+ } |
+ |
+ // 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(InlineTextBox::rotation(boxRect, InlineTextBox::Clockwise)); |
+ paintDecoration(context, boxOrigin, textDecorations); |
+ if (combinedText) |
+ context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Counterclockwise)); |
+ } |
+ |
+ if (paintInfo.phase == PaintPhaseForeground) { |
+ paintDocumentMarkers(context, boxOrigin, styleToUse, font, false); |
+ |
+ // Paint custom underlines for compositions. |
+ if (useCustomUnderlines) { |
+ const Vector<CompositionUnderline>& underlines = m_inlineTextBox.renderer().frame()->inputMethodController().customCompositionUnderlines(); |
+ CompositionUnderlineRangeFilter filter(underlines, m_inlineTextBox.start(), m_inlineTextBox.end()); |
+ for (CompositionUnderlineRangeFilter::ConstIterator it = filter.begin(); it != filter.end(); ++it) { |
+ if (it->color == Color::transparent) |
+ continue; |
+ paintCompositionUnderline(context, boxOrigin, *it); |
+ } |
+ } |
+ } |
+ |
+ if (shouldRotate) |
+ context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Counterclockwise)); |
+} |
+ |
+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::paintCompositionBackgrounds(GraphicsContext* pt, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, bool useCustomUnderlines) |
+{ |
+ if (useCustomUnderlines) { |
+ // Paint custom background highlights for compositions. |
+ const Vector<CompositionUnderline>& underlines = m_inlineTextBox.renderer().frame()->inputMethodController().customCompositionUnderlines(); |
+ CompositionUnderlineRangeFilter filter(underlines, m_inlineTextBox.start(), m_inlineTextBox.end()); |
+ for (CompositionUnderlineRangeFilter::ConstIterator it = filter.begin(); it != filter.end(); ++it) { |
+ if (it->backgroundColor == Color::transparent) |
+ continue; |
+ paintSingleCompositionBackgroundRun(pt, boxOrigin, style, font, it->backgroundColor, underlinePaintStart(*it), underlinePaintEnd(*it)); |
+ } |
+ |
+ } else { |
+ paintSingleCompositionBackgroundRun(pt, boxOrigin, style, font, RenderTheme::theme().platformDefaultCompositionBackgroundColor(), |
+ m_inlineTextBox.renderer().frame()->inputMethodController().compositionStart(), |
+ m_inlineTextBox.renderer().frame()->inputMethodController().compositionEnd()); |
+ } |
+} |
+ |
+void InlineTextBoxPainter::paintSingleCompositionBackgroundRun(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, Color backgroundColor, int startPos, int endPos) |
+{ |
+ 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.renderer().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(), boxOrigin.y() - deltaY); |
+ context->drawHighlightForText(font, m_inlineTextBox.constructTextRun(style, font), localOrigin, selHeight, backgroundColor, sPos, ePos); |
+} |
+ |
+void InlineTextBoxPainter::paintDocumentMarkers(GraphicsContext* pt, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, bool background) |
+{ |
+ if (!m_inlineTextBox.renderer().node()) |
+ return; |
+ |
+ DocumentMarkerVector markers = m_inlineTextBox.renderer().document().markers().markersFor(m_inlineTextBox.renderer().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; |
+ 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; |
+ 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 FloatPoint& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font, bool grammar) |
+{ |
+ // Never print spelling/grammar markers (5327887) |
+ if (m_inlineTextBox.renderer().document().printing()) |
+ return; |
+ |
+ if (m_inlineTextBox.truncation() == cFullTruncation) |
+ return; |
+ |
+ float start = 0; // start of line to draw, relative to tx |
+ float 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.renderer().style()->isFlippedLinesWritingMode() ? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom() : m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
+ int selHeight = m_inlineTextBox.root().selectionHeight(); |
+ FloatPoint 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, startPoint, selHeight, startPosition, endPosition)); |
+ start = markerRect.x() - startPoint.x(); |
+ width = markerRect.width(); |
+ |
+ // Store rendered rects for bad grammar markers, so we can hit-test against it elsewhere in order to |
+ // display a toolTip. We don't do this for misspelling markers. |
+ if (grammar) { |
+ markerRect.move(-boxOrigin.x(), -boxOrigin.y()); |
+ markerRect = m_inlineTextBox.renderer().localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox(); |
+ toRenderedDocumentMarker(marker)->setRenderedRect(markerRect); |
+ } |
+ } |
+ |
+ // 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.renderer().style(m_inlineTextBox.isFirstLineStyle())->fontMetrics().ascent(); |
+ int descent = m_inlineTextBox.logicalHeight() - baseline; |
+ int underlineOffset; |
+ if (descent <= (2 + lineThickness)) { |
+ // 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, boxOrigin.y() + underlineOffset), width, lineStyleForMarkerType(marker->type())); |
+} |
+ |
+void InlineTextBoxPainter::paintSelection(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, Color textColor) |
+{ |
+ // 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.renderer().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.renderer().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.renderer().textLength() - m_inlineTextBox.start(), respectHyphen ? &charactersWithHyphen : 0); |
+ if (respectHyphen) |
+ ePos = textRun.length(); |
+ |
+ LayoutUnit selectionBottom = m_inlineTextBox.root().selectionBottom(); |
+ LayoutUnit selectionTop = m_inlineTextBox.root().selectionTopAdjustedForPrecedingBlock(); |
+ |
+ int deltaY = roundToInt(m_inlineTextBox.renderer().style()->isFlippedLinesWritingMode() ? selectionBottom - m_inlineTextBox.logicalBottom() : m_inlineTextBox.logicalTop() - selectionTop); |
+ int selHeight = std::max(0, roundToInt(selectionBottom - selectionTop)); |
+ |
+ FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY); |
+ FloatRect clipRect(localOrigin, FloatSize(m_inlineTextBox.logicalWidth(), selHeight)); |
+ |
+ GraphicsContextStateSaver stateSaver(*context); |
+ context->clip(clipRect); |
+ context->drawHighlightForText(font, textRun, localOrigin, selHeight, c, sPos, ePos); |
+} |
+ |
+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 float 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, |
+ RenderObject::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(start, width, isPrinting); |
+ |
+ if (decoration.style == TextDecorationStyleDouble) |
+ context->drawLineForText(start + FloatPoint(0, doubleOffset), width, isPrinting); |
+ } |
+} |
+ |
+void InlineTextBoxPainter::paintDecoration(GraphicsContext* context, const FloatPoint& boxOrigin, TextDecoration deco) |
+{ |
+ GraphicsContextStateSaver stateSaver(*context); |
+ |
+ if (m_inlineTextBox.truncation() == cFullTruncation) |
+ return; |
+ |
+ FloatPoint localOrigin = boxOrigin; |
+ |
+ float width = m_inlineTextBox.logicalWidth(); |
+ if (m_inlineTextBox.truncation() != cNoTruncation) { |
+ width = m_inlineTextBox.renderer().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. |
+ RenderObject::AppliedTextDecoration underline, overline, linethrough; |
+ m_inlineTextBox.renderer().getTextDecorations(deco, underline, overline, linethrough, true); |
+ if (m_inlineTextBox.isFirstLineStyle()) |
+ m_inlineTextBox.renderer().getTextDecorations(deco, underline, overline, linethrough, true, true); |
+ |
+ // Use a special function for underlines to get the positioning exactly right. |
+ bool isPrinting = m_inlineTextBox.renderer().document().printing(); |
+ |
+ RenderStyle* styleToUse = m_inlineTextBox.renderer().style(m_inlineTextBox.isFirstLineStyle()); |
+ int 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) |
+ && BoxPainter::shouldAntialiasLines(context); |
+ |
+ // 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, localOrigin + FloatPoint(0, underlineOffset), width, doubleOffset, 1, underline, textDecorationThickness, antialiasDecoration, isPrinting); |
+ } |
+ if (deco & TextDecorationOverline) { |
+ paintAppliedDecoration(context, localOrigin, width, -doubleOffset, 1, overline, textDecorationThickness, antialiasDecoration, isPrinting); |
+ } |
+ if (deco & TextDecorationLineThrough) { |
+ const float lineThroughOffset = 2 * baseline / 3; |
+ paintAppliedDecoration(context, localOrigin + FloatPoint(0, lineThroughOffset), width, doubleOffset, 0, linethrough, textDecorationThickness, antialiasDecoration, isPrinting); |
+ } |
+} |
+ |
+void InlineTextBoxPainter::paintCompositionUnderline(GraphicsContext* ctx, const FloatPoint& boxOrigin, const CompositionUnderline& underline) |
+{ |
+ 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.renderer().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() : |
+ m_inlineTextBox.renderer().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.renderer().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), width, m_inlineTextBox.renderer().document().printing()); |
+} |
+ |
+void InlineTextBoxPainter::paintTextMatchMarker(GraphicsContext* pt, const FloatPoint& boxOrigin, DocumentMarker* marker, RenderStyle* 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.renderer().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); |
+ |
+ // Always compute and store the rect associated with this marker. The computed rect is in absolute coordinates. |
+ IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, IntPoint(m_inlineTextBox.x(), m_inlineTextBox.root().selectionTop()), selHeight, sPos, ePos)); |
+ markerRect = m_inlineTextBox.renderer().localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox(); |
+ toRenderedDocumentMarker(marker)->setRenderedRect(markerRect); |
+ |
+ // Optionally highlight the text |
+ if (m_inlineTextBox.renderer().frame()->editor().markedTextMatchesAreHighlighted()) { |
+ Color color = marker->activeMatch() ? |
+ RenderTheme::theme().platformActiveTextSearchHighlightColor() : |
+ RenderTheme::theme().platformInactiveTextSearchHighlightColor(); |
+ GraphicsContextStateSaver stateSaver(*pt); |
+ pt->clip(FloatRect(boxOrigin.x(), boxOrigin.y() - deltaY, m_inlineTextBox.logicalWidth(), selHeight)); |
+ pt->drawHighlightForText(font, run, FloatPoint(boxOrigin.x(), boxOrigin.y() - deltaY), selHeight, color, sPos, ePos); |
+ } |
+} |
+ |
+ |
+} // namespace blink |