| /* |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "sky/engine/core/rendering/InlineTextBox.h" |
| |
| #include "gen/sky/platform/RuntimeEnabledFeatures.h" |
| #include "sky/engine/core/dom/Document.h" |
| #include "sky/engine/core/dom/DocumentMarkerController.h" |
| #include "sky/engine/core/dom/RenderedDocumentMarker.h" |
| #include "sky/engine/core/dom/Text.h" |
| #include "sky/engine/core/editing/CompositionUnderline.h" |
| #include "sky/engine/core/editing/CompositionUnderlineRangeFilter.h" |
| #include "sky/engine/core/frame/LocalFrame.h" |
| #include "sky/engine/core/frame/Settings.h" |
| #include "sky/engine/core/page/Page.h" |
| #include "sky/engine/core/rendering/EllipsisBox.h" |
| #include "sky/engine/core/rendering/HitTestResult.h" |
| #include "sky/engine/core/rendering/PaintInfo.h" |
| #include "sky/engine/core/rendering/RenderBlock.h" |
| #include "sky/engine/core/rendering/RenderTheme.h" |
| #include "sky/engine/core/rendering/style/ShadowList.h" |
| #include "sky/engine/platform/animation/UnitBezier.h" |
| #include "sky/engine/platform/fonts/FontCache.h" |
| #include "sky/engine/platform/fonts/GlyphBuffer.h" |
| #include "sky/engine/platform/fonts/WidthIterator.h" |
| #include "sky/engine/platform/graphics/GraphicsContextStateSaver.h" |
| #include "sky/engine/wtf/Vector.h" |
| #include "sky/engine/wtf/text/CString.h" |
| #include "sky/engine/wtf/text/StringBuilder.h" |
| |
| #include <algorithm> |
| |
| namespace blink { |
| |
| struct SameSizeAsInlineTextBox : public InlineBox { |
| unsigned variables[1]; |
| unsigned short variables2[2]; |
| void* pointers[3]; |
| }; |
| |
| COMPILE_ASSERT(sizeof(InlineTextBox) == sizeof(SameSizeAsInlineTextBox), InlineTextBox_should_stay_small); |
| |
| typedef WTF::HashMap<const InlineTextBox*, LayoutRect> InlineTextBoxOverflowMap; |
| static InlineTextBoxOverflowMap* gTextBoxesWithOverflow; |
| |
| static const int misspellingLineThickness = 3; |
| |
| void InlineTextBox::destroy() |
| { |
| if (!knownToHaveNoOverflow() && gTextBoxesWithOverflow) |
| gTextBoxesWithOverflow->remove(this); |
| InlineBox::destroy(); |
| } |
| |
| void InlineTextBox::markDirty() |
| { |
| m_len = 0; |
| m_start = 0; |
| InlineBox::markDirty(); |
| } |
| |
| LayoutRect InlineTextBox::logicalOverflowRect() const |
| { |
| if (knownToHaveNoOverflow() || !gTextBoxesWithOverflow) |
| return enclosingIntRect(logicalFrameRect()); |
| return gTextBoxesWithOverflow->get(this); |
| } |
| |
| void InlineTextBox::setLogicalOverflowRect(const LayoutRect& rect) |
| { |
| ASSERT(!knownToHaveNoOverflow()); |
| if (!gTextBoxesWithOverflow) |
| gTextBoxesWithOverflow = new InlineTextBoxOverflowMap; |
| gTextBoxesWithOverflow->add(this, rect); |
| } |
| |
| int InlineTextBox::baselinePosition(FontBaseline baselineType) const |
| { |
| if (!isText() || !parent()) |
| return 0; |
| if (parent()->renderer() == renderer().parent()) |
| return parent()->baselinePosition(baselineType); |
| return toRenderBoxModelObject(renderer().parent())->baselinePosition(baselineType, isFirstLineStyle(), HorizontalLine, PositionOnContainingLine); |
| } |
| |
| LayoutUnit InlineTextBox::lineHeight() const |
| { |
| if (!isText() || !renderer().parent()) |
| return 0; |
| if (parent()->renderer() == renderer().parent()) |
| return parent()->lineHeight(); |
| return toRenderBoxModelObject(renderer().parent())->lineHeight(isFirstLineStyle(), HorizontalLine, PositionOnContainingLine); |
| } |
| |
| LayoutUnit InlineTextBox::selectionTop() |
| { |
| return root().selectionTop(); |
| } |
| |
| LayoutUnit InlineTextBox::selectionBottom() |
| { |
| return root().selectionBottom(); |
| } |
| |
| LayoutUnit InlineTextBox::selectionHeight() |
| { |
| return root().selectionHeight(); |
| } |
| |
| bool InlineTextBox::isSelected(int startPos, int endPos) const |
| { |
| int sPos = std::max(startPos - m_start, 0); |
| // The position after a hard line break is considered to be past its end. |
| // See the corresponding code in InlineTextBox::selectionState. |
| int ePos = std::min(endPos - m_start, int(m_len) + (isLineBreak() ? 0 : 1)); |
| return (sPos < ePos); |
| } |
| |
| RenderObject::SelectionState InlineTextBox::selectionState() |
| { |
| RenderObject::SelectionState state = renderer().selectionState(); |
| if (state == RenderObject::SelectionStart || state == RenderObject::SelectionEnd || state == RenderObject::SelectionBoth) { |
| int startPos, endPos; |
| renderer().selectionStartEnd(startPos, endPos); |
| // The position after a hard line break is considered to be past its end. |
| // See the corresponding code in InlineTextBox::isSelected. |
| int lastSelectable = start() + len() - (isLineBreak() ? 1 : 0); |
| |
| // FIXME: Remove -webkit-line-break: LineBreakAfterWhiteSpace. |
| int endOfLineAdjustmentForCSSLineBreak = renderer().style()->lineBreak() == LineBreakAfterWhiteSpace ? -1 : 0; |
| bool start = (state != RenderObject::SelectionEnd && startPos >= m_start && startPos <= m_start + m_len + endOfLineAdjustmentForCSSLineBreak); |
| bool end = (state != RenderObject::SelectionStart && endPos > m_start && endPos <= lastSelectable); |
| if (start && end) |
| state = RenderObject::SelectionBoth; |
| else if (start) |
| state = RenderObject::SelectionStart; |
| else if (end) |
| state = RenderObject::SelectionEnd; |
| else if ((state == RenderObject::SelectionEnd || startPos < m_start) && |
| (state == RenderObject::SelectionStart || endPos > lastSelectable)) |
| state = RenderObject::SelectionInside; |
| else if (state == RenderObject::SelectionBoth) |
| state = RenderObject::SelectionNone; |
| } |
| |
| // If there are ellipsis following, make sure their selection is updated. |
| if (m_truncation != cNoTruncation && root().ellipsisBox()) { |
| EllipsisBox* ellipsis = root().ellipsisBox(); |
| if (state != RenderObject::SelectionNone) { |
| int start, end; |
| selectionStartEnd(start, end); |
| // The ellipsis should be considered to be selected if the end of |
| // the selection is past the beginning of the truncation and the |
| // beginning of the selection is before or at the beginning of the |
| // truncation. |
| ellipsis->setSelectionState(end >= m_truncation && start <= m_truncation ? |
| RenderObject::SelectionInside : RenderObject::SelectionNone); |
| } else |
| ellipsis->setSelectionState(RenderObject::SelectionNone); |
| } |
| |
| return state; |
| } |
| |
| LayoutRect InlineTextBox::localSelectionRect(int startPos, int endPos) |
| { |
| int sPos = std::max(startPos - m_start, 0); |
| int ePos = std::min(endPos - m_start, (int)m_len); |
| |
| if (sPos > ePos) |
| return LayoutRect(); |
| |
| FontCachePurgePreventer fontCachePurgePreventer; |
| |
| LayoutUnit selTop = selectionTop(); |
| LayoutUnit selHeight = selectionHeight(); |
| RenderStyle* styleToUse = renderer().style(isFirstLineStyle()); |
| const Font& font = styleToUse->font(); |
| |
| StringBuilder charactersWithHyphen; |
| bool respectHyphen = ePos == m_len && hasHyphen(); |
| TextRun textRun = constructTextRun(styleToUse, font, respectHyphen ? &charactersWithHyphen : 0); |
| |
| FloatPoint startingPoint = FloatPoint(logicalLeft(), selTop.toFloat()); |
| LayoutRect r; |
| if (sPos || ePos != static_cast<int>(m_len)) |
| r = enclosingIntRect(font.selectionRectForText(textRun, startingPoint, selHeight, sPos, ePos)); |
| else // Avoid computing the font width when the entire line box is selected as an optimization. |
| r = enclosingIntRect(FloatRect(startingPoint, FloatSize(m_logicalWidth, selHeight.toFloat()))); |
| |
| LayoutUnit logicalWidth = r.width(); |
| if (r.x() > logicalRight()) |
| logicalWidth = 0; |
| else if (r.maxX() > logicalRight()) |
| logicalWidth = logicalRight() - r.x(); |
| |
| LayoutPoint topPoint = LayoutPoint(r.x(), selTop); |
| return LayoutRect(topPoint, LayoutSize(logicalWidth, selHeight)); |
| } |
| |
| void InlineTextBox::deleteLine() |
| { |
| renderer().removeTextBox(this); |
| destroy(); |
| } |
| |
| void InlineTextBox::extractLine() |
| { |
| if (extracted()) |
| return; |
| |
| renderer().extractTextBox(this); |
| } |
| |
| void InlineTextBox::attachLine() |
| { |
| if (!extracted()) |
| return; |
| |
| renderer().attachTextBox(this); |
| } |
| |
| float InlineTextBox::placeEllipsisBox(bool flowIsLTR, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox) |
| { |
| if (foundBox) { |
| m_truncation = cFullTruncation; |
| return -1; |
| } |
| |
| // For LTR this is the left edge of the box, for RTL, the right edge in parent coordinates. |
| float ellipsisX = flowIsLTR ? visibleRightEdge - ellipsisWidth : visibleLeftEdge + ellipsisWidth; |
| |
| // Criteria for full truncation: |
| // LTR: the left edge of the ellipsis is to the left of our text run. |
| // RTL: the right edge of the ellipsis is to the right of our text run. |
| bool ltrFullTruncation = flowIsLTR && ellipsisX <= logicalLeft(); |
| bool rtlFullTruncation = !flowIsLTR && ellipsisX >= logicalLeft() + logicalWidth(); |
| if (ltrFullTruncation || rtlFullTruncation) { |
| // Too far. Just set full truncation, but return -1 and let the ellipsis just be placed at the edge of the box. |
| m_truncation = cFullTruncation; |
| foundBox = true; |
| return -1; |
| } |
| |
| bool ltrEllipsisWithinBox = flowIsLTR && (ellipsisX < logicalRight()); |
| bool rtlEllipsisWithinBox = !flowIsLTR && (ellipsisX > logicalLeft()); |
| if (ltrEllipsisWithinBox || rtlEllipsisWithinBox) { |
| foundBox = true; |
| |
| // The inline box may have different directionality than it's parent. Since truncation |
| // behavior depends both on both the parent and the inline block's directionality, we |
| // must keep track of these separately. |
| bool ltr = isLeftToRightDirection(); |
| if (ltr != flowIsLTR) { |
| // Width in pixels of the visible portion of the box, excluding the ellipsis. |
| int visibleBoxWidth = visibleRightEdge - visibleLeftEdge - ellipsisWidth; |
| ellipsisX = ltr ? logicalLeft() + visibleBoxWidth : logicalRight() - visibleBoxWidth; |
| } |
| |
| int offset = offsetForPosition(ellipsisX, false); |
| if (offset == 0) { |
| // No characters should be rendered. Set ourselves to full truncation and place the ellipsis at the min of our start |
| // and the ellipsis edge. |
| m_truncation = cFullTruncation; |
| truncatedWidth += ellipsisWidth; |
| return std::min(ellipsisX, logicalLeft()); |
| } |
| |
| // Set the truncation index on the text run. |
| m_truncation = offset; |
| |
| // If we got here that means that we were only partially truncated and we need to return the pixel offset at which |
| // to place the ellipsis. |
| float widthOfVisibleText = renderer().width(m_start, offset, textPos(), flowIsLTR ? LTR : RTL, isFirstLineStyle()); |
| |
| // The ellipsis needs to be placed just after the last visible character. |
| // Where "after" is defined by the flow directionality, not the inline |
| // box directionality. |
| // e.g. In the case of an LTR inline box truncated in an RTL flow then we can |
| // have a situation such as |Hello| -> |...He| |
| truncatedWidth += widthOfVisibleText + ellipsisWidth; |
| if (flowIsLTR) |
| return logicalLeft() + widthOfVisibleText; |
| else |
| return logicalRight() - widthOfVisibleText - ellipsisWidth; |
| } |
| truncatedWidth += logicalWidth(); |
| return -1; |
| } |
| |
| bool InlineTextBox::isLineBreak() const |
| { |
| return renderer().style()->preserveNewline() && len() == 1 && (*renderer().text().impl())[start()] == '\n'; |
| } |
| |
| bool InlineTextBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit /* lineTop */, LayoutUnit /*lineBottom*/) |
| { |
| if (isLineBreak()) |
| return false; |
| |
| FloatPoint boxOrigin = locationIncludingFlipping(); |
| boxOrigin.moveBy(accumulatedOffset); |
| FloatRect rect(boxOrigin, size()); |
| if (m_truncation != cFullTruncation && visibleToHitTestRequest(request) && locationInContainer.intersects(rect)) { |
| renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); |
| if (!result.addNodeToRectBasedTestResult(renderer().node(), request, locationInContainer, rect)) |
| return true; |
| } |
| return false; |
| } |
| |
| bool InlineTextBox::getEmphasisMarkPosition(RenderStyle* style, TextEmphasisPosition& emphasisPosition) const |
| { |
| if (style->textEmphasisMark() == TextEmphasisMarkNone) |
| return false; |
| // FIXME(sky): remove this function, it was for ruby. |
| emphasisPosition = style->textEmphasisPosition(); |
| return true; |
| } |
| |
| namespace { |
| |
| struct TextPaintingStyle { |
| Color fillColor; |
| Color strokeColor; |
| Color emphasisMarkColor; |
| float strokeWidth; |
| const ShadowList* shadow; |
| |
| bool operator==(const TextPaintingStyle& other) |
| { |
| return fillColor == other.fillColor |
| && strokeColor == other.strokeColor |
| && emphasisMarkColor == other.emphasisMarkColor |
| && strokeWidth == other.strokeWidth |
| && shadow == other.shadow; |
| } |
| bool operator!=(const TextPaintingStyle& other) { return !(*this == other); } |
| }; |
| |
| TextPaintingStyle textPaintingStyle(RenderText& renderer, RenderStyle* style) |
| { |
| TextPaintingStyle textStyle; |
| textStyle.fillColor = renderer.resolveColor(style, CSSPropertyWebkitTextFillColor); |
| textStyle.strokeColor = renderer.resolveColor(style, CSSPropertyWebkitTextStrokeColor); |
| textStyle.emphasisMarkColor = renderer.resolveColor(style, CSSPropertyWebkitTextEmphasisColor); |
| textStyle.strokeWidth = style->textStrokeWidth(); |
| textStyle.shadow = style->textShadow(); |
| return textStyle; |
| } |
| |
| TextPaintingStyle selectionPaintingStyle(RenderText& renderer, bool haveSelection, const TextPaintingStyle& textStyle) |
| { |
| TextPaintingStyle selectionStyle = textStyle; |
| |
| if (haveSelection) { |
| selectionStyle.fillColor = renderer.selectionForegroundColor(); |
| selectionStyle.emphasisMarkColor = renderer.selectionEmphasisMarkColor(); |
| } |
| |
| return selectionStyle; |
| } |
| |
| void updateGraphicsContext(GraphicsContext* context, const TextPaintingStyle& textStyle, GraphicsContextStateSaver& stateSaver) |
| { |
| TextDrawingModeFlags mode = context->textDrawingMode(); |
| if (textStyle.strokeWidth > 0) { |
| TextDrawingModeFlags newMode = mode | TextModeStroke; |
| if (mode != newMode) { |
| if (!stateSaver.saved()) |
| stateSaver.save(); |
| context->setTextDrawingMode(newMode); |
| mode = newMode; |
| } |
| } |
| |
| if (mode & TextModeFill && textStyle.fillColor != context->fillColor()) |
| context->setFillColor(textStyle.fillColor); |
| |
| if (mode & TextModeStroke) { |
| if (textStyle.strokeColor != context->strokeColor()) |
| context->setStrokeColor(textStyle.strokeColor); |
| if (textStyle.strokeWidth != context->strokeThickness()) |
| context->setStrokeThickness(textStyle.strokeWidth); |
| } |
| |
| if (textStyle.shadow) { |
| if (!stateSaver.saved()) |
| stateSaver.save(); |
| context->setDrawLooper(textStyle.shadow->createDrawLooper(DrawLooperBuilder::ShadowIgnoresAlpha)); |
| } |
| } |
| |
| void paintText(GraphicsContext* context, |
| const Font& font, const TextRun& textRun, |
| const AtomicString& emphasisMark, int emphasisMarkOffset, |
| int startOffset, int endOffset, int truncationPoint, |
| const FloatPoint& textOrigin, const FloatRect& boxRect, |
| TextBlobPtr* cachedTextBlob = 0) |
| { |
| TextRunPaintInfo textRunPaintInfo(textRun); |
| textRunPaintInfo.bounds = boxRect; |
| if (startOffset <= endOffset) { |
| textRunPaintInfo.from = startOffset; |
| textRunPaintInfo.to = endOffset; |
| // FIXME: We should be able to use cachedTextBlob in more cases. |
| textRunPaintInfo.cachedTextBlob = cachedTextBlob; |
| if (emphasisMark.isEmpty()) |
| context->drawText(font, textRunPaintInfo, textOrigin); |
| else |
| context->drawEmphasisMarks(font, textRunPaintInfo, emphasisMark, textOrigin + IntSize(0, emphasisMarkOffset)); |
| } else { |
| if (endOffset > 0) { |
| textRunPaintInfo.from = 0; |
| textRunPaintInfo.to = endOffset; |
| if (emphasisMark.isEmpty()) |
| context->drawText(font, textRunPaintInfo, textOrigin); |
| else |
| context->drawEmphasisMarks(font, textRunPaintInfo, emphasisMark, textOrigin + IntSize(0, emphasisMarkOffset)); |
| } |
| if (startOffset < truncationPoint) { |
| textRunPaintInfo.from = startOffset; |
| textRunPaintInfo.to = truncationPoint; |
| if (emphasisMark.isEmpty()) |
| context->drawText(font, textRunPaintInfo, textOrigin); |
| else |
| context->drawEmphasisMarks(font, textRunPaintInfo, emphasisMark, textOrigin + IntSize(0, emphasisMarkOffset)); |
| } |
| } |
| } |
| |
| inline void paintEmphasisMark(GraphicsContext* context, |
| const AtomicString& emphasisMark, int emphasisMarkOffset, |
| int startOffset, int endOffset, int paintRunLength, |
| const Font& font, const TextRun& textRun, |
| const FloatPoint& textOrigin, const FloatRect& boxRect) |
| { |
| ASSERT(!emphasisMark.isEmpty()); |
| paintText(context, font, textRun, emphasisMark, emphasisMarkOffset, startOffset, endOffset, paintRunLength, textOrigin, boxRect); |
| } |
| |
| void paintTextWithEmphasisMark( |
| GraphicsContext* context, const Font& font, const TextPaintingStyle& textStyle, const TextRun& textRun, |
| const AtomicString& emphasisMark, int emphasisMarkOffset, int startOffset, int endOffset, int length, |
| const FloatPoint& textOrigin, const FloatRect& boxRect, TextBlobPtr* cachedTextBlob = 0) |
| { |
| GraphicsContextStateSaver stateSaver(*context, false); |
| updateGraphicsContext(context, textStyle, stateSaver); |
| paintText(context, font, textRun, nullAtom, 0, startOffset, endOffset, length, textOrigin, boxRect, cachedTextBlob); |
| |
| if (!emphasisMark.isEmpty()) { |
| if (textStyle.emphasisMarkColor != textStyle.fillColor) |
| context->setFillColor(textStyle.emphasisMarkColor); |
| paintEmphasisMark(context, emphasisMark, emphasisMarkOffset, startOffset, endOffset, length, font, textRun, textOrigin, boxRect); |
| } |
| } |
| |
| } // namespace |
| |
| void InlineTextBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit /*lineTop*/, LayoutUnit /*lineBottom*/, Vector<RenderBox*>& layers) |
| { |
| if (isLineBreak() || m_truncation == cFullTruncation || !m_len) |
| return; |
| |
| LayoutRect logicalVisualOverflow = logicalOverflowRect(); |
| LayoutUnit logicalStart = logicalVisualOverflow.x() + paintOffset.x(); |
| LayoutUnit logicalExtent = logicalVisualOverflow.width(); |
| |
| LayoutUnit paintEnd = paintInfo.rect.maxX(); |
| LayoutUnit paintStart = paintInfo.rect.x(); |
| |
| // 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; |
| |
| if (m_truncation != cNoTruncation) { |
| if (renderer().containingBlock()->style()->isLeftToRightDirection() != 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 = renderer().width(m_start, m_truncation, textPos(), isLeftToRightDirection() ? LTR : RTL, isFirstLineStyle()); |
| LayoutUnit widthOfHiddenText = m_logicalWidth - widthOfVisibleText; |
| // FIXME: The hit testing logic also needs to take this translation into account. |
| LayoutSize truncationOffset(isLeftToRightDirection() ? widthOfHiddenText : -widthOfHiddenText, 0); |
| adjustedPaintOffset.move(truncationOffset); |
| } |
| } |
| |
| GraphicsContext* context = paintInfo.context; |
| RenderStyle* styleToUse = renderer().style(isFirstLineStyle()); |
| |
| FloatPoint boxOrigin = locationIncludingFlipping(); |
| boxOrigin.move(adjustedPaintOffset.x().toFloat(), adjustedPaintOffset.y().toFloat()); |
| FloatRect boxRect(boxOrigin, LayoutSize(logicalWidth(), logicalHeight())); |
| |
| bool haveSelection = selectionState() != RenderObject::SelectionNone; |
| |
| // Determine text colors. |
| TextPaintingStyle textStyle = textPaintingStyle(renderer(), styleToUse); |
| TextPaintingStyle selectionStyle = selectionPaintingStyle(renderer(), haveSelection, textStyle); |
| bool paintSelectedTextSeparately = textStyle != selectionStyle; |
| |
| // Set our font. |
| const Font& font = styleToUse->font(); |
| |
| FloatPoint textOrigin = FloatPoint(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent()); |
| |
| // 1. Paint backgrounds behind text if needed. Examples of such backgrounds include selection. |
| paintDocumentMarkers(context, boxOrigin, styleToUse, font, true); |
| if (haveSelection) |
| 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_len; |
| int maximumLength; |
| StringView string = renderer().text().createView(); |
| if (static_cast<unsigned>(length) != string.length() || m_start) |
| string.narrow(m_start, length); |
| maximumLength = renderer().textLength() - m_start; |
| |
| StringBuilder charactersWithHyphen; |
| TextRun textRun = constructTextRun(styleToUse, font, string, maximumLength, hasHyphen() ? &charactersWithHyphen : 0); |
| if (hasHyphen()) |
| length = textRun.length(); |
| |
| int sPos = 0; |
| int ePos = 0; |
| if (paintSelectedTextSeparately) |
| selectionStartEnd(sPos, ePos); |
| |
| bool respectHyphen = ePos == m_len && hasHyphen(); |
| if (respectHyphen) |
| ePos = textRun.length(); |
| |
| if (m_truncation != cNoTruncation) { |
| sPos = std::min<int>(sPos, m_truncation); |
| ePos = std::min<int>(ePos, m_truncation); |
| length = m_truncation; |
| } |
| |
| int emphasisMarkOffset = 0; |
| TextEmphasisPosition emphasisMarkPosition; |
| bool hasTextEmphasis = getEmphasisMarkPosition(styleToUse, emphasisMarkPosition); |
| const AtomicString& emphasisMark = hasTextEmphasis ? styleToUse->textEmphasisMarkString() : nullAtom; |
| if (!emphasisMark.isEmpty()) |
| emphasisMarkOffset = emphasisMarkPosition == TextEmphasisPositionOver ? -font.fontMetrics().ascent() - font.emphasisMarkDescent(emphasisMark) : font.fontMetrics().descent() + font.emphasisMarkAscent(emphasisMark); |
| |
| // FIXME: Truncate right-to-left text correctly. |
| int startOffset = 0; |
| int endOffset = length; |
| if (paintSelectedTextSeparately && ePos > sPos) { |
| startOffset = ePos; |
| endOffset = sPos; |
| } |
| // 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 = textBlobIsCacheable ? &m_cachedTextBlob : nullptr; |
| paintTextWithEmphasisMark(context, font, textStyle, textRun, emphasisMark, emphasisMarkOffset, startOffset, endOffset, length, textOrigin, boxRect, cachedTextBlob); |
| |
| if (paintSelectedTextSeparately && sPos < ePos) { |
| // paint only the text that is selected |
| bool textBlobIsCacheable = RuntimeEnabledFeatures::textBlobEnabled() && sPos == 0 && ePos == length; |
| TextBlobPtr* cachedTextBlob = textBlobIsCacheable ? &m_cachedTextBlob : nullptr; |
| paintTextWithEmphasisMark(context, font, selectionStyle, textRun, emphasisMark, emphasisMarkOffset, sPos, ePos, length, textOrigin, boxRect, cachedTextBlob); |
| } |
| |
| // Paint decorations |
| TextDecoration textDecorations = styleToUse->textDecorationsInEffect(); |
| if (textDecorations != TextDecorationNone) { |
| GraphicsContextStateSaver stateSaver(*context, false); |
| updateGraphicsContext(context, textStyle, stateSaver); |
| paintDecoration(context, boxOrigin, textDecorations); |
| } |
| |
| paintDocumentMarkers(context, boxOrigin, styleToUse, font, false); |
| |
| } |
| |
| void InlineTextBox::selectionStartEnd(int& sPos, int& ePos) |
| { |
| int startPos, endPos; |
| if (renderer().selectionState() == RenderObject::SelectionInside) { |
| startPos = 0; |
| endPos = renderer().textLength(); |
| } else { |
| renderer().selectionStartEnd(startPos, endPos); |
| if (renderer().selectionState() == RenderObject::SelectionStart) |
| endPos = renderer().textLength(); |
| else if (renderer().selectionState() == RenderObject::SelectionEnd) |
| startPos = 0; |
| } |
| |
| sPos = std::max(startPos - m_start, 0); |
| ePos = std::min(endPos - m_start, (int)m_len); |
| } |
| |
| void InlineTextBox::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; |
| selectionStartEnd(sPos, ePos); |
| if (sPos >= ePos) |
| return; |
| |
| Color c = 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_truncation != cNoTruncation ? m_truncation : m_len; |
| StringView string = renderer().text().createView(); |
| |
| if (string.length() != static_cast<unsigned>(length) || m_start) |
| string.narrow(m_start, length); |
| |
| StringBuilder charactersWithHyphen; |
| bool respectHyphen = ePos == length && hasHyphen(); |
| TextRun textRun = constructTextRun(style, font, string, renderer().textLength() - m_start, respectHyphen ? &charactersWithHyphen : 0); |
| if (respectHyphen) |
| ePos = textRun.length(); |
| |
| LayoutUnit selectionBottom = root().selectionBottom(); |
| LayoutUnit selectionTop = root().selectionTopAdjustedForPrecedingBlock(); |
| |
| int deltaY = roundToInt(logicalTop() - selectionTop); |
| int selHeight = std::max(0, roundToInt(selectionBottom - selectionTop)); |
| |
| FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY); |
| FloatRect clipRect(localOrigin, FloatSize(m_logicalWidth, selHeight)); |
| |
| GraphicsContextStateSaver stateSaver(*context); |
| context->clip(clipRect); |
| context->drawHighlightForText(font, textRun, localOrigin, selHeight, c, sPos, ePos); |
| } |
| |
| unsigned InlineTextBox::underlinePaintStart(const CompositionUnderline& underline) |
| { |
| return std::max(static_cast<unsigned>(m_start), underline.startOffset); |
| } |
| |
| unsigned InlineTextBox::underlinePaintEnd(const CompositionUnderline& underline) |
| { |
| unsigned paintEnd = std::min(end() + 1, underline.endOffset); // end() points at the last char, not past it. |
| if (m_truncation != cNoTruncation) |
| paintEnd = std::min(paintEnd, static_cast<unsigned>(m_start + m_truncation)); |
| return paintEnd; |
| } |
| |
| void InlineTextBox::paintSingleCompositionBackgroundRun(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, Color backgroundColor, int startPos, int endPos) |
| { |
| int sPos = std::max(startPos - m_start, 0); |
| int ePos = std::min(endPos - m_start, static_cast<int>(m_len)); |
| if (sPos >= ePos) |
| return; |
| |
| int deltaY = logicalTop() - selectionTop(); |
| int selHeight = selectionHeight(); |
| FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY); |
| context->drawHighlightForText(font, constructTextRun(style, font), localOrigin, selHeight, backgroundColor, sPos, ePos); |
| } |
| |
| 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 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; |
| } |
| |
| struct CurveAlongX { |
| static inline float x(const FloatPoint& p) { return p.x(); } |
| static inline float y(const FloatPoint& p) { return p.y(); } |
| static inline FloatPoint p(float x, float y) { return FloatPoint(x, y); } |
| static inline void setX(FloatPoint& p, double x) { p.setX(x); } |
| }; |
| |
| struct CurveAlongY { |
| static inline float x(const FloatPoint& p) { return p.y(); } |
| static inline float y(const FloatPoint& p) { return p.x(); } |
| static inline FloatPoint p(float x, float y) { return FloatPoint(y, x); } |
| static inline void setX(FloatPoint& p, double x) { p.setY(x); } |
| }; |
| |
| /* |
| * Draw one cubic Bezier curve and repeat the same pattern along the |
| * the decoration's axis. The start point (p1), controlPoint1, |
| * controlPoint2 and end point (p2) of the Bezier curve form a diamond |
| * shape, as follows (the four points marked +): |
| * |
| * step |
| * |-----------| |
| * |
| * controlPoint1 |
| * + |
| * |
| * |
| * . . |
| * . . |
| * . . |
| * (x1, y1) p1 + . + p2 (x2, y2) - <--- Decoration's axis |
| * . . | |
| * . . | |
| * . . | controlPointDistance |
| * | |
| * | |
| * + - |
| * controlPoint2 |
| * |
| * |-----------| |
| * step |
| * |
| * strokeWavyTextDecorationInternal() takes two points, p1 and p2. |
| * These must be axis-aligned. If they are horizontally-aligned, |
| * specialize it with CurveAlongX; if they are vertically aligned, |
| * specialize it with CurveAlongY. The function is written as if it |
| * was doing everything along the X axis; CurveAlongY just flips the |
| * coordinates around. |
| */ |
| template <class Curve> static void strokeWavyTextDecorationInternal(GraphicsContext* context, FloatPoint p1, FloatPoint p2, float strokeThickness) |
| { |
| ASSERT(Curve::y(p1) == Curve::y(p2)); // verify that this is indeed axis-aligned |
| |
| context->adjustLineToPixelBoundaries(p1, p2, strokeThickness, context->strokeStyle()); |
| |
| Path path; |
| path.moveTo(p1); |
| |
| float controlPointDistance = 2 * strokeThickness; |
| float step = controlPointDistance; |
| |
| float yAxis = Curve::y(p1); |
| float x1; |
| float x2; |
| |
| if (Curve::x(p1) < Curve::x(p2)) { |
| x1 = Curve::x(p1); |
| x2 = Curve::x(p2); |
| } else { |
| x1 = Curve::x(p2); |
| x2 = Curve::x(p1); |
| } |
| |
| FloatPoint controlPoint1 = Curve::p(0, yAxis + controlPointDistance); |
| FloatPoint controlPoint2 = Curve::p(0, yAxis - controlPointDistance); |
| |
| float x; |
| for (x = x1; x + 2 * step <= x2;) { |
| Curve::setX(controlPoint1, x + step); |
| Curve::setX(controlPoint2, x + step); |
| x += 2 * step; |
| path.addBezierCurveTo(controlPoint1, controlPoint2, Curve::p(x, yAxis)); |
| } |
| |
| if (x < x2) { |
| Curve::setX(controlPoint1, x + step); |
| Curve::setX(controlPoint2, x + step); |
| float xScale = 1.0 / (2 * step); |
| float yScale = 1.0 / (2 * controlPointDistance); |
| OwnPtr<UnitBezier> bezier = adoptPtr(new UnitBezier((Curve::x(controlPoint1) - x) * xScale, |
| (Curve::y(controlPoint1) - yAxis) * yScale, |
| (Curve::x(controlPoint2) - x) * xScale, |
| (Curve::y(controlPoint2) - yAxis) * yScale)); |
| float t = bezier->solveCurveX((x2 - x) / (2.0 * step), std::numeric_limits<double>::epsilon()); |
| // following math based on http://stackoverflow.com/a/879213 |
| float u1 = 1.0 - t; |
| float qxb = x * u1 * u1 + Curve::x(controlPoint1) * 2 * t * u1 + Curve::x(controlPoint2) * t * t; |
| float qxd = Curve::x(controlPoint1) * u1 * u1 + Curve::x(controlPoint2) * 2 * t * u1 + (x+step) * t * t; |
| float qyb = yAxis * u1 * u1 + Curve::y(controlPoint1) * 2 * t * u1 + Curve::y(controlPoint2) * t * t; |
| float qyd = Curve::y(controlPoint1) * u1 * u1 + Curve::y(controlPoint2) * 2 * t * u1 + yAxis * t * t; |
| float xb = x * u1 + Curve::x(controlPoint1) * t; |
| float yb = yAxis * u1 + Curve::y(controlPoint1) * t; |
| float xc = qxb; |
| float xd = qxb * u1 + qxd * t; |
| float yc = qyb; |
| float yd = qyb * u1 + qyd * t; |
| path.addBezierCurveTo(Curve::p(xb, yb), Curve::p(xc, yc), Curve::p(xd, yd)); |
| } |
| |
| context->setShouldAntialias(true); |
| context->strokePath(path); |
| } |
| |
| static void strokeWavyTextDecoration(GraphicsContext* context, FloatPoint p1, FloatPoint p2, float strokeThickness) |
| { |
| if (p1.y() == p2.y()) // horizontal line |
| strokeWavyTextDecorationInternal<CurveAlongX>(context, p1, p2, strokeThickness); |
| else // vertical line |
| strokeWavyTextDecorationInternal<CurveAlongY>(context, p1, p2, strokeThickness); |
| } |
| |
| 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 void paintAppliedDecoration(GraphicsContext* context, FloatPoint start, float width, float doubleOffset, int wavyOffsetFactor, |
| RenderObject::AppliedTextDecoration decoration, float thickness, bool antialiasDecoration) |
| { |
| 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); |
| |
| if (decoration.style == TextDecorationStyleDouble) |
| context->drawLineForText(start + FloatPoint(0, doubleOffset), width); |
| } |
| } |
| |
| void InlineTextBox::paintDecoration(GraphicsContext* context, const FloatPoint& boxOrigin, TextDecoration deco) |
| { |
| GraphicsContextStateSaver stateSaver(*context); |
| |
| if (m_truncation == cFullTruncation) |
| return; |
| |
| FloatPoint localOrigin = boxOrigin; |
| |
| float width = m_logicalWidth; |
| if (m_truncation != cNoTruncation) { |
| width = renderer().width(m_start, m_truncation, textPos(), isLeftToRightDirection() ? LTR : RTL, isFirstLineStyle()); |
| if (!isLeftToRightDirection()) |
| localOrigin.move(m_logicalWidth - width, 0); |
| } |
| |
| // Get the text decoration colors. |
| RenderObject::AppliedTextDecoration underline, overline, linethrough; |
| renderer().getTextDecorations(deco, underline, overline, linethrough, true); |
| if (isFirstLineStyle()) |
| renderer().getTextDecorations(deco, underline, overline, linethrough, true, true); |
| |
| // Use a special function for underlines to get the positioning exactly right. |
| |
| RenderStyle* styleToUse = renderer().style(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. |
| |
| // Update Underline thickness, in case we have Faulty Font Metrics calculating underline thickness by old method. |
| float textDecorationThickness = styleToUse->fontMetrics().underlineThickness(); // TODO(ianh): Make this author-controllable |
| 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) |
| && RenderBoxModelObject::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(), this, textDecorationThickness); |
| paintAppliedDecoration(context, localOrigin + FloatPoint(0, underlineOffset), width, doubleOffset, 1, underline, textDecorationThickness, antialiasDecoration); |
| } |
| if (deco & TextDecorationOverline) { |
| paintAppliedDecoration(context, localOrigin, width, -doubleOffset, 1, overline, textDecorationThickness, antialiasDecoration); |
| } |
| if (deco & TextDecorationLineThrough) { |
| const float lineThroughOffset = 2 * baseline / 3; |
| paintAppliedDecoration(context, localOrigin + FloatPoint(0, lineThroughOffset), width, doubleOffset, 0, linethrough, textDecorationThickness, antialiasDecoration); |
| } |
| } |
| |
| 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 InlineTextBox::paintDocumentMarker(GraphicsContext* pt, const FloatPoint& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font, bool grammar) |
| { |
| if (m_truncation == cFullTruncation) |
| return; |
| |
| float start = 0; // start of line to draw, relative to tx |
| float width = m_logicalWidth; // how much line to draw |
| |
| // Determine whether we need to measure text |
| bool markerSpansWholeBox = true; |
| if (m_start <= (int)marker->startOffset()) |
| markerSpansWholeBox = false; |
| if ((end() + 1) != marker->endOffset()) // end points at the last char, not past it |
| markerSpansWholeBox = false; |
| if (m_truncation != cNoTruncation) |
| markerSpansWholeBox = false; |
| |
| if (!markerSpansWholeBox || grammar) { |
| int startPosition = std::max<int>(marker->startOffset() - m_start, 0); |
| int endPosition = std::min<int>(marker->endOffset() - m_start, m_len); |
| |
| if (m_truncation != cNoTruncation) |
| endPosition = std::min<int>(endPosition, m_truncation); |
| |
| // Calculate start & width |
| int deltaY = logicalTop() - selectionTop(); |
| int selHeight = selectionHeight(); |
| FloatPoint startPoint(boxOrigin.x(), boxOrigin.y() - deltaY); |
| TextRun run = 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(); |
| } |
| |
| // 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 = renderer().style(isFirstLineStyle())->fontMetrics().ascent(); |
| int descent = logicalHeight() - baseline; |
| int underlineOffset; |
| if (descent <= (2 + lineThickness)) { |
| // Place the underline at the very bottom of the text in small/medium fonts. |
| underlineOffset = 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 InlineTextBox::paintTextMatchMarker(GraphicsContext* pt, const FloatPoint& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font) |
| { |
| // FIXME(sky): This function didn't seem to actually paint. |
| // Do we even have TextMatch markers in sky? What are they for? |
| } |
| |
| void InlineTextBox::paintCompositionBackgrounds(GraphicsContext* pt, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, bool useCustomUnderlines) |
| { |
| ASSERT_NOT_REACHED(); // TODO(ianh): this is unused right now, but we should probably expose it if it's useful |
| if (useCustomUnderlines) { |
| // Paint custom background highlights for compositions. |
| Vector<CompositionUnderline> underlines; // TODO(ianh): if we expose this function, provide a way to let authors set this |
| CompositionUnderlineRangeFilter filter(underlines, start(), 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 { |
| unsigned start = 0; // TODO(ianh): if we expose this function, provide a way to let authors set this |
| unsigned end = 0; // TODO(ianh): if we expose this function, provide a way to let authors set this |
| paintSingleCompositionBackgroundRun(pt, boxOrigin, style, font, RenderTheme::theme().platformDefaultCompositionBackgroundColor(), start, end); |
| } |
| } |
| |
| void InlineTextBox::paintDocumentMarkers(GraphicsContext* pt, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, bool background) |
| { |
| if (!renderer().node()) |
| return; |
| |
| DocumentMarkerVector markers = renderer().document().markers().markersFor(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() <= 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() > 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: |
| paintDocumentMarker(pt, boxOrigin, marker, style, font, false); |
| break; |
| case DocumentMarker::Grammar: |
| paintDocumentMarker(pt, boxOrigin, marker, style, font, true); |
| break; |
| case DocumentMarker::TextMatch: |
| paintTextMatchMarker(pt, boxOrigin, marker, style, font); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| |
| } |
| } |
| |
| void InlineTextBox::paintCompositionUnderline(GraphicsContext* ctx, const FloatPoint& boxOrigin, const CompositionUnderline& underline) |
| { |
| if (m_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_start) ? 0 : |
| renderer().width(m_start, paintStart - m_start, textPos(), isLeftToRightDirection() ? LTR : RTL, isFirstLineStyle()); |
| // how much line to draw |
| float width = (paintStart == static_cast<unsigned>(m_start) && paintEnd == static_cast<unsigned>(end()) + 1) ? m_logicalWidth : |
| renderer().width(paintStart, paintEnd - paintStart, textPos() + start, isLeftToRightDirection() ? LTR : RTL, 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 = renderer().style(isFirstLineStyle())->fontMetrics().ascent(); |
| if (underline.thick && 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() + logicalHeight() - lineThickness), width); |
| } |
| |
| int InlineTextBox::caretMinOffset() const |
| { |
| return m_start; |
| } |
| |
| int InlineTextBox::caretMaxOffset() const |
| { |
| return m_start + m_len; |
| } |
| |
| float InlineTextBox::textPos() const |
| { |
| // When computing the width of a text run, RenderParagraph::computeInlineDirectionPositionsForLine() doesn't include the actual offset |
| // from the containing block edge in its measurement. textPos() should be consistent so the text are rendered in the same width. |
| if (logicalLeft() == 0) |
| return 0; |
| return logicalLeft() - root().logicalLeft(); |
| } |
| |
| int InlineTextBox::offsetForPosition(float lineOffset, bool includePartialGlyphs) const |
| { |
| if (isLineBreak()) |
| return 0; |
| |
| if (lineOffset - logicalLeft() > logicalWidth()) |
| return isLeftToRightDirection() ? len() : 0; |
| if (lineOffset - logicalLeft() < 0) |
| return isLeftToRightDirection() ? 0 : len(); |
| |
| FontCachePurgePreventer fontCachePurgePreventer; |
| |
| RenderText& text = renderer(); |
| RenderStyle* style = text.style(isFirstLineStyle()); |
| const Font& font = style->font(); |
| return font.offsetForPosition(constructTextRun(style, font), lineOffset - logicalLeft(), includePartialGlyphs); |
| } |
| |
| float InlineTextBox::positionForOffset(int offset) const |
| { |
| ASSERT(offset >= m_start); |
| ASSERT(offset <= m_start + m_len); |
| |
| if (isLineBreak()) |
| return logicalLeft(); |
| |
| FontCachePurgePreventer fontCachePurgePreventer; |
| |
| RenderText& text = renderer(); |
| RenderStyle* styleToUse = text.style(isFirstLineStyle()); |
| ASSERT(styleToUse); |
| const Font& font = styleToUse->font(); |
| int from = !isLeftToRightDirection() ? offset - m_start : 0; |
| int to = !isLeftToRightDirection() ? m_len : offset - m_start; |
| // FIXME: Do we need to add rightBearing here? |
| return font.selectionRectForText(constructTextRun(styleToUse, font), IntPoint(logicalLeft(), 0), 0, from, to).maxX(); |
| } |
| |
| bool InlineTextBox::containsCaretOffset(int offset) const |
| { |
| // Offsets before the box are never "in". |
| if (offset < m_start) |
| return false; |
| |
| int pastEnd = m_start + m_len; |
| |
| // Offsets inside the box (not at either edge) are always "in". |
| if (offset < pastEnd) |
| return true; |
| |
| // Offsets outside the box are always "out". |
| if (offset > pastEnd) |
| return false; |
| |
| // Offsets at the end are "out" for line breaks (they are on the next line). |
| if (isLineBreak()) |
| return false; |
| |
| // Offsets at the end are "in" for normal boxes (but the caller has to check affinity). |
| return true; |
| } |
| |
| void InlineTextBox::characterWidths(Vector<float>& widths) const |
| { |
| FontCachePurgePreventer fontCachePurgePreventer; |
| |
| RenderStyle* styleToUse = renderer().style(isFirstLineStyle()); |
| const Font& font = styleToUse->font(); |
| |
| TextRun textRun = constructTextRun(styleToUse, font); |
| |
| GlyphBuffer glyphBuffer; |
| WidthIterator it(&font, textRun); |
| float lastWidth = 0; |
| widths.resize(m_len); |
| for (unsigned i = 0; i < m_len; i++) { |
| it.advance(i + 1, &glyphBuffer); |
| widths[i] = it.m_runWidthSoFar - lastWidth; |
| lastWidth = it.m_runWidthSoFar; |
| } |
| } |
| |
| TextRun InlineTextBox::constructTextRun(RenderStyle* style, const Font& font, StringBuilder* charactersWithHyphen) const |
| { |
| ASSERT(style); |
| ASSERT(renderer().text()); |
| |
| StringView string = renderer().text().createView(); |
| unsigned startPos = start(); |
| unsigned length = len(); |
| |
| if (string.length() != length || startPos) |
| string.narrow(startPos, length); |
| |
| return constructTextRun(style, font, string, renderer().textLength() - startPos, charactersWithHyphen); |
| } |
| |
| TextRun InlineTextBox::constructTextRun(RenderStyle* style, const Font& font, StringView string, int maximumLength, StringBuilder* charactersWithHyphen) const |
| { |
| ASSERT(style); |
| |
| if (charactersWithHyphen) { |
| const AtomicString& hyphenString = style->hyphenString(); |
| charactersWithHyphen->reserveCapacity(string.length() + hyphenString.length()); |
| charactersWithHyphen->append(string); |
| charactersWithHyphen->append(hyphenString); |
| string = charactersWithHyphen->toString().createView(); |
| maximumLength = string.length(); |
| } |
| |
| ASSERT(maximumLength >= static_cast<int>(string.length())); |
| |
| TextRun run(string, textPos(), expansion(), expansionBehavior(), direction(), dirOverride() || style->rtlOrdering() == VisualOrder, !renderer().canUseSimpleFontCodePath()); |
| run.setTabSize(!style->collapseWhiteSpace(), style->tabSize()); |
| run.setCharacterScanForCodePath(!renderer().canUseSimpleFontCodePath()); |
| // Propagate the maximum length of the characters buffer to the TextRun, even when we're only processing a substring. |
| run.setCharactersLength(maximumLength); |
| ASSERT(run.charactersLength() >= run.length()); |
| return run; |
| } |
| |
| TextRun InlineTextBox::constructTextRunForInspector(RenderStyle* style, const Font& font) const |
| { |
| return InlineTextBox::constructTextRun(style, font); |
| } |
| |
| #ifndef NDEBUG |
| |
| const char* InlineTextBox::boxName() const |
| { |
| return "InlineTextBox"; |
| } |
| |
| void InlineTextBox::showBox(int printedCharacters) const |
| { |
| const RenderText& obj = renderer(); |
| String value = obj.text(); |
| value = value.substring(start(), len()); |
| value.replaceWithLiteral('\\', "\\\\"); |
| value.replaceWithLiteral('\n', "\\n"); |
| printedCharacters += fprintf(stderr, "%s\t%p", boxName(), this); |
| for (; printedCharacters < showTreeCharacterOffset; printedCharacters++) |
| fputc(' ', stderr); |
| printedCharacters = fprintf(stderr, "\t%s %p", obj.renderName(), &obj); |
| const int rendererCharacterOffset = 24; |
| for (; printedCharacters < rendererCharacterOffset; printedCharacters++) |
| fputc(' ', stderr); |
| fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data()); |
| } |
| |
| #endif |
| |
| } // namespace blink |
