--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/InlineTextBox.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,1071 @@
+/*
+ * (C) 1999 Lars Knoll (knoll@kde.org)
+ * (C) 2000 Dirk Mueller (mueller@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 "config.h"
+#include "InlineTextBox.h"
+
+#include "Chrome.h"
+#include "ChromeClient.h"
+#include "Document.h"
+#include "Editor.h"
+#include "EllipsisBox.h"
+#include "Frame.h"
+#include "GraphicsContext.h"
+#include "HitTestResult.h"
+#include "Page.h"
+#include "RenderArena.h"
+#include "RenderBlock.h"
+#include "RenderTheme.h"
+#include "Text.h"
+#include "break_lines.h"
+#include <wtf/AlwaysInline.h>
+
+using namespace std;
+
+namespace WebCore {
+
+int InlineTextBox::selectionTop()
+{
+ return root()->selectionTop();
+}
+
+int InlineTextBox::selectionHeight()
+{
+ return root()->selectionHeight();
+}
+
+bool InlineTextBox::isSelected(int startPos, int endPos) const
+{
+ int sPos = max(startPos - m_start, 0);
+ int ePos = min(endPos - m_start, (int)m_len);
+ 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.
+ int lastSelectable = start() + len() - (isLineBreak() ? 1 : 0);
+
+ bool start = (state != RenderObject::SelectionEnd && startPos >= m_start && startPos < m_start + m_len);
+ 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;
+}
+
+typedef Vector<UChar, 256> BufferForAppendingHyphen;
+
+static void adjustCharactersAndLengthForHyphen(BufferForAppendingHyphen& charactersWithHyphen, RenderStyle* style, const UChar*& characters, int& length)
+{
+ const AtomicString& hyphenString = style->hyphenString();
+ charactersWithHyphen.reserveCapacity(length + hyphenString.length());
+ charactersWithHyphen.append(characters, length);
+ charactersWithHyphen.append(hyphenString.characters(), hyphenString.length());
+ characters = charactersWithHyphen.data();
+ length += hyphenString.length();
+}
+
+IntRect InlineTextBox::selectionRect(int tx, int ty, int startPos, int endPos)
+{
+ int sPos = max(startPos - m_start, 0);
+ int ePos = min(endPos - m_start, (int)m_len);
+
+ if (sPos > ePos)
+ return IntRect();
+
+ RenderText* textObj = textRenderer();
+ int selTop = selectionTop();
+ int selHeight = selectionHeight();
+ RenderStyle* styleToUse = textObj->style(m_firstLine);
+ const Font& f = styleToUse->font();
+
+ const UChar* characters = textObj->text()->characters() + m_start;
+ int len = m_len;
+ BufferForAppendingHyphen charactersWithHyphen;
+ if (ePos == len && hasHyphen()) {
+ adjustCharactersAndLengthForHyphen(charactersWithHyphen, styleToUse, characters, len);
+ ePos = len;
+ }
+
+ IntRect r = enclosingIntRect(f.selectionRectForText(TextRun(characters, len, textObj->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride),
+ IntPoint(tx + m_x, ty + selTop), selHeight, sPos, ePos));
+ if (r.x() > tx + m_x + m_width)
+ r.setWidth(0);
+ else if (r.right() - 1 > tx + m_x + m_width)
+ r.setWidth(tx + m_x + m_width - r.x());
+ return r;
+}
+
+void InlineTextBox::deleteLine(RenderArena* arena)
+{
+ toRenderText(renderer())->removeTextBox(this);
+ destroy(arena);
+}
+
+void InlineTextBox::extractLine()
+{
+ if (m_extracted)
+ return;
+
+ toRenderText(renderer())->extractTextBox(this);
+}
+
+void InlineTextBox::attachLine()
+{
+ if (!m_extracted)
+ return;
+
+ toRenderText(renderer())->attachTextBox(this);
+}
+
+int InlineTextBox::placeEllipsisBox(bool flowIsLTR, int visibleLeftEdge, int visibleRightEdge, int ellipsisWidth, 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.
+ int 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 <= m_x;
+ bool rtlFullTruncation = !flowIsLTR && ellipsisX >= (m_x + m_width);
+ 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 < m_x + m_width);
+ bool rtlEllipsisWithinBox = !flowIsLTR && (ellipsisX > m_x);
+ 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 = direction() == LTR;
+ if (ltr != flowIsLTR) {
+ // Width in pixels of the visible portion of the box, excluding the ellipsis.
+ int visibleBoxWidth = visibleRightEdge - visibleLeftEdge - ellipsisWidth;
+ ellipsisX = ltr ? m_x + visibleBoxWidth : m_x + m_width - 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;
+ return min(ellipsisX, m_x);
+ }
+
+ // 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.
+ int widthOfVisibleText = toRenderText(renderer())->width(m_start, offset, textPos(), m_firstLine);
+
+ // 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|
+ if (flowIsLTR)
+ return m_x + widthOfVisibleText;
+ else
+ return (m_x + m_width) - widthOfVisibleText - ellipsisWidth;
+ }
+ return -1;
+}
+
+Color correctedTextColor(Color textColor, Color backgroundColor)
+{
+ // Adjust the text color if it is too close to the background color,
+ // by darkening or lightening it to move it further away.
+
+ int d = differenceSquared(textColor, backgroundColor);
+ // semi-arbitrarily chose 65025 (255^2) value here after a few tests;
+ if (d > 65025) {
+ return textColor;
+ }
+
+ int distanceFromWhite = differenceSquared(textColor, Color::white);
+ int distanceFromBlack = differenceSquared(textColor, Color::black);
+
+ if (distanceFromWhite < distanceFromBlack) {
+ return textColor.dark();
+ }
+
+ return textColor.light();
+}
+
+void updateGraphicsContext(GraphicsContext* context, const Color& fillColor, const Color& strokeColor, float strokeThickness, ColorSpace colorSpace)
+{
+ int mode = context->textDrawingMode();
+ if (strokeThickness > 0) {
+ int newMode = mode | cTextStroke;
+ if (mode != newMode) {
+ context->setTextDrawingMode(newMode);
+ mode = newMode;
+ }
+ }
+
+ if (mode & cTextFill && (fillColor != context->fillColor() || colorSpace != context->fillColorSpace()))
+ context->setFillColor(fillColor, colorSpace);
+
+ if (mode & cTextStroke) {
+ if (strokeColor != context->strokeColor())
+ context->setStrokeColor(strokeColor, colorSpace);
+ if (strokeThickness != context->strokeThickness())
+ context->setStrokeThickness(strokeThickness);
+ }
+}
+
+bool InlineTextBox::isLineBreak() const
+{
+ return renderer()->isBR() || (renderer()->style()->preserveNewline() && len() == 1 && (*textRenderer()->text())[start()] == '\n');
+}
+
+bool InlineTextBox::nodeAtPoint(const HitTestRequest&, HitTestResult& result, int x, int y, int tx, int ty)
+{
+ if (isLineBreak())
+ return false;
+
+ IntRect rect(tx + m_x, ty + m_y, m_width, height());
+ if (m_truncation != cFullTruncation && visibleToHitTesting() && rect.intersects(result.rectFromPoint(x, y))) {
+ renderer()->updateHitTestResult(result, IntPoint(x - tx, y - ty));
+ if (!result.addNodeToRectBasedTestResult(renderer()->node(), x, y, rect))
+ return true;
+ }
+ return false;
+}
+
+FloatSize InlineTextBox::applyShadowToGraphicsContext(GraphicsContext* context, const ShadowData* shadow, const FloatRect& textRect, bool stroked, bool opaque)
+{
+ if (!shadow)
+ return FloatSize();
+
+ FloatSize extraOffset;
+ FloatSize shadowOffset(shadow->x(), shadow->y());
+ int shadowBlur = shadow->blur();
+ const Color& shadowColor = shadow->color();
+
+ if (shadow->next() || stroked || !opaque) {
+ FloatRect shadowRect(textRect);
+ shadowRect.inflate(shadowBlur);
+ shadowRect.move(shadowOffset);
+ context->save();
+ context->clip(shadowRect);
+
+ extraOffset = FloatSize(0, 2 * textRect.height() + max(0.0f, shadowOffset.height()) + shadowBlur);
+ shadowOffset -= extraOffset;
+ }
+
+ context->setShadow(shadowOffset, shadowBlur, shadowColor, context->fillColorSpace());
+ return extraOffset;
+}
+
+static void paintTextWithShadows(GraphicsContext* context, const Font& font, const TextRun& textRun, int startOffset, int endOffset, int truncationPoint, const IntPoint& textOrigin, int x, int y, int w, int h, const ShadowData* shadow, bool stroked)
+{
+ Color fillColor = context->fillColor();
+ ColorSpace fillColorSpace = context->fillColorSpace();
+ bool opaque = fillColor.alpha() == 255;
+ if (!opaque)
+ context->setFillColor(Color::black, fillColorSpace);
+
+ do {
+ IntSize extraOffset;
+ if (shadow)
+ extraOffset = roundedIntSize(InlineTextBox::applyShadowToGraphicsContext(context, shadow, FloatRect(x, y, w, h), stroked, opaque));
+ else if (!opaque)
+ context->setFillColor(fillColor, fillColorSpace);
+
+ if (startOffset <= endOffset)
+ context->drawText(font, textRun, textOrigin + extraOffset, startOffset, endOffset);
+ else {
+ if (endOffset > 0)
+ context->drawText(font, textRun, textOrigin + extraOffset, 0, endOffset);
+ if (startOffset < truncationPoint)
+ context->drawText(font, textRun, textOrigin + extraOffset, startOffset, truncationPoint);
+ }
+
+ if (!shadow)
+ break;
+
+ if (shadow->next() || stroked || !opaque)
+ context->restore();
+ else
+ context->clearShadow();
+
+ shadow = shadow->next();
+ } while (shadow || stroked || !opaque);
+}
+
+void InlineTextBox::paint(PaintInfo& paintInfo, int tx, int ty)
+{
+ if (isLineBreak() || !paintInfo.shouldPaintWithinRoot(renderer()) || renderer()->style()->visibility() != VISIBLE ||
+ m_truncation == cFullTruncation || paintInfo.phase == PaintPhaseOutline)
+ return;
+
+ ASSERT(paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines);
+
+ // FIXME: Technically we're potentially incorporating other visual overflow that had nothing to do with us.
+ // Would it be simpler to just check our own shadow and stroke overflow by hand here?
+ int leftOverflow = parent()->x() - parent()->leftVisualOverflow();
+ int rightOverflow = parent()->rightVisualOverflow() - (parent()->x() + parent()->width());
+ int xPos = tx + m_x - leftOverflow;
+ int w = width() + leftOverflow + rightOverflow;
+ if (xPos >= paintInfo.rect.right() || xPos + w <= paintInfo.rect.x())
+ return;
+
+ bool isPrinting = textRenderer()->document()->printing();
+
+ // Determine whether or not we're selected.
+ bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && 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_truncation != cNoTruncation) {
+ TextDirection flowDirection = renderer()->containingBlock()->style()->direction();
+ if (flowDirection != direction()) {
+ // 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|
+ int widthOfVisibleText = toRenderText(renderer())->width(m_start, m_truncation, textPos(), m_firstLine);
+ int widthOfHiddenText = m_width - widthOfVisibleText;
+ // FIXME: The hit testing logic also needs to take this translation int account.
+ tx += direction() == LTR ? widthOfHiddenText : -widthOfHiddenText;
+ }
+ }
+
+ GraphicsContext* context = paintInfo.context;
+
+ // Determine whether or not we have composition underlines to draw.
+ bool containsComposition = renderer()->node() && renderer()->frame()->editor()->compositionNode() == renderer()->node();
+ bool useCustomUnderlines = containsComposition && renderer()->frame()->editor()->compositionUsesCustomUnderlines();
+
+ // Set our font.
+ RenderStyle* styleToUse = renderer()->style(m_firstLine);
+ int d = styleToUse->textDecorationsInEffect();
+ const Font& font = styleToUse->font();
+
+ // 1. Paint backgrounds behind text if needed. Examples of such backgrounds include selection
+ // and composition underlines.
+ if (paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && !isPrinting) {
+#if PLATFORM(MAC)
+ // Custom highlighters go behind everything else.
+ if (styleToUse->highlight() != nullAtom && !context->paintingDisabled())
+ paintCustomHighlight(tx, ty, styleToUse->highlight());
+#endif
+
+ if (containsComposition && !useCustomUnderlines)
+ paintCompositionBackground(context, tx, ty, styleToUse, font,
+ renderer()->frame()->editor()->compositionStart(),
+ renderer()->frame()->editor()->compositionEnd());
+
+ paintDocumentMarkers(context, tx, ty, styleToUse, font, true);
+
+ if (haveSelection && !useCustomUnderlines)
+ paintSelection(context, tx, ty, styleToUse, font);
+ }
+
+ // 2. Now paint the foreground, including text and decorations like underline/overline (in quirks mode only).
+ if (m_len <= 0)
+ return;
+
+ Color textFillColor;
+ Color textStrokeColor;
+ float textStrokeWidth = styleToUse->textStrokeWidth();
+ const ShadowData* textShadow = paintInfo.forceBlackText ? 0 : styleToUse->textShadow();
+
+ if (paintInfo.forceBlackText) {
+ textFillColor = Color::black;
+ textStrokeColor = Color::black;
+ } else {
+ textFillColor = styleToUse->visitedDependentColor(CSSPropertyWebkitTextFillColor);
+
+ // Make the text fill color legible against a white background
+ if (styleToUse->forceBackgroundsToWhite())
+ textFillColor = correctedTextColor(textFillColor, Color::white);
+
+ textStrokeColor = styleToUse->visitedDependentColor(CSSPropertyWebkitTextStrokeColor);
+
+ // Make the text stroke color legible against a white background
+ if (styleToUse->forceBackgroundsToWhite())
+ textStrokeColor = correctedTextColor(textStrokeColor, Color::white);
+ }
+
+ bool paintSelectedTextOnly = (paintInfo.phase == PaintPhaseSelection);
+ bool paintSelectedTextSeparately = false;
+
+ Color selectionFillColor = textFillColor;
+ Color selectionStrokeColor = textStrokeColor;
+ float selectionStrokeWidth = textStrokeWidth;
+ const ShadowData* selectionShadow = textShadow;
+ if (haveSelection) {
+ // Check foreground color first.
+ Color foreground = paintInfo.forceBlackText ? Color::black : renderer()->selectionForegroundColor();
+ if (foreground.isValid() && foreground != selectionFillColor) {
+ if (!paintSelectedTextOnly)
+ paintSelectedTextSeparately = true;
+ selectionFillColor = foreground;
+ }
+
+ if (RenderStyle* pseudoStyle = renderer()->getCachedPseudoStyle(SELECTION)) {
+ const ShadowData* shadow = paintInfo.forceBlackText ? 0 : pseudoStyle->textShadow();
+ if (shadow != selectionShadow) {
+ if (!paintSelectedTextOnly)
+ paintSelectedTextSeparately = true;
+ selectionShadow = shadow;
+ }
+
+ float strokeWidth = pseudoStyle->textStrokeWidth();
+ if (strokeWidth != selectionStrokeWidth) {
+ if (!paintSelectedTextOnly)
+ paintSelectedTextSeparately = true;
+ selectionStrokeWidth = strokeWidth;
+ }
+
+ Color stroke = paintInfo.forceBlackText ? Color::black : pseudoStyle->visitedDependentColor(CSSPropertyWebkitTextStrokeColor);
+ if (stroke != selectionStrokeColor) {
+ if (!paintSelectedTextOnly)
+ paintSelectedTextSeparately = true;
+ selectionStrokeColor = stroke;
+ }
+ }
+ }
+
+ const UChar* characters = textRenderer()->text()->characters() + m_start;
+ int length = m_len;
+ BufferForAppendingHyphen charactersWithHyphen;
+ if (hasHyphen())
+ adjustCharactersAndLengthForHyphen(charactersWithHyphen, styleToUse, characters, length);
+
+ int baseline = renderer()->style(m_firstLine)->font().ascent();
+ IntPoint textOrigin(m_x + tx, m_y + ty + baseline);
+ TextRun textRun(characters, length, textRenderer()->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride || styleToUse->visuallyOrdered());
+
+ int sPos = 0;
+ int ePos = 0;
+ if (paintSelectedTextOnly || paintSelectedTextSeparately)
+ selectionStartEnd(sPos, ePos);
+
+ if (m_truncation != cNoTruncation) {
+ sPos = min<int>(sPos, m_truncation);
+ ePos = min<int>(ePos, m_truncation);
+ length = m_truncation;
+ }
+
+ if (!paintSelectedTextOnly) {
+ // For stroked painting, we have to change the text drawing mode. It's probably dangerous to leave that mutated as a side
+ // effect, so only when we know we're stroking, do a save/restore.
+ if (textStrokeWidth > 0)
+ context->save();
+
+ updateGraphicsContext(context, textFillColor, textStrokeColor, textStrokeWidth, styleToUse->colorSpace());
+ if (!paintSelectedTextSeparately || ePos <= sPos) {
+ // FIXME: Truncate right-to-left text correctly.
+ paintTextWithShadows(context, font, textRun, 0, length, length, textOrigin, m_x + tx, m_y + ty, width(), height(), textShadow, textStrokeWidth > 0);
+ } else
+ paintTextWithShadows(context, font, textRun, ePos, sPos, length, textOrigin, m_x + tx, m_y + ty, width(), height(), textShadow, textStrokeWidth > 0);
+
+ if (textStrokeWidth > 0)
+ context->restore();
+ }
+
+ if ((paintSelectedTextOnly || paintSelectedTextSeparately) && sPos < ePos) {
+ // paint only the text that is selected
+ if (selectionStrokeWidth > 0)
+ context->save();
+
+ updateGraphicsContext(context, selectionFillColor, selectionStrokeColor, selectionStrokeWidth, styleToUse->colorSpace());
+ paintTextWithShadows(context, font, textRun, sPos, ePos, length, textOrigin, m_x + tx, m_y + ty, width(), height(), selectionShadow, selectionStrokeWidth > 0);
+
+ if (selectionStrokeWidth > 0)
+ context->restore();
+ }
+
+ // Paint decorations
+ if (d != TDNONE && paintInfo.phase != PaintPhaseSelection && styleToUse->htmlHacks()) {
+ context->setStrokeColor(styleToUse->visitedDependentColor(CSSPropertyColor), styleToUse->colorSpace());
+ paintDecoration(context, tx, ty, d, textShadow);
+ }
+
+ if (paintInfo.phase == PaintPhaseForeground) {
+ paintDocumentMarkers(context, tx, ty, styleToUse, font, false);
+
+ if (useCustomUnderlines) {
+ const Vector<CompositionUnderline>& underlines = renderer()->frame()->editor()->customCompositionUnderlines();
+ size_t numUnderlines = underlines.size();
+
+ for (size_t index = 0; index < numUnderlines; ++index) {
+ const CompositionUnderline& underline = underlines[index];
+
+ if (underline.endOffset <= start())
+ // underline is completely before this run. This might be an underline that sits
+ // before the first run we draw, or underlines that were within runs we skipped
+ // due to truncation.
+ continue;
+
+ if (underline.startOffset <= end()) {
+ // underline intersects this run. Paint it.
+ paintCompositionUnderline(context, tx, ty, underline);
+ if (underline.endOffset > end() + 1)
+ // underline also runs into the next run. Bail now, no more marker advancement.
+ break;
+ } else
+ // underline is completely after this run, bail. A later run will paint it.
+ break;
+ }
+ }
+ }
+}
+
+void InlineTextBox::selectionStartEnd(int& sPos, int& ePos)
+{
+ int startPos, endPos;
+ if (renderer()->selectionState() == RenderObject::SelectionInside) {
+ startPos = 0;
+ endPos = textRenderer()->textLength();
+ } else {
+ textRenderer()->selectionStartEnd(startPos, endPos);
+ if (renderer()->selectionState() == RenderObject::SelectionStart)
+ endPos = textRenderer()->textLength();
+ else if (renderer()->selectionState() == RenderObject::SelectionEnd)
+ startPos = 0;
+ }
+
+ sPos = max(startPos - m_start, 0);
+ ePos = min(endPos - m_start, (int)m_len);
+}
+
+void InlineTextBox::paintSelection(GraphicsContext* context, int tx, int ty, RenderStyle* style, const Font& font)
+{
+ // See if we have a selection to paint at all.
+ int sPos, ePos;
+ selectionStartEnd(sPos, ePos);
+ if (sPos >= ePos)
+ return;
+
+ Color textColor = style->visitedDependentColor(CSSPropertyColor);
+ Color c = renderer()->selectionBackgroundColor();
+ if (!c.isValid() || c.alpha() == 0)
+ return;
+
+ // If the text color ends up being the same as the selection background, invert the selection
+ // background. This should basically never happen, since the selection has transparency.
+ if (textColor == c)
+ c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());
+
+ context->save();
+ updateGraphicsContext(context, c, c, 0, style->colorSpace()); // Don't draw text at all!
+ int y = selectionTop();
+ int h = selectionHeight();
+ // 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;
+ const UChar* characters = textRenderer()->text()->characters() + m_start;
+
+ BufferForAppendingHyphen charactersWithHyphen;
+ if (ePos == length && hasHyphen()) {
+ adjustCharactersAndLengthForHyphen(charactersWithHyphen, style, characters, length);
+ ePos = length;
+ }
+
+ context->clip(IntRect(m_x + tx, y + ty, m_width, h));
+ context->drawHighlightForText(font, TextRun(characters, length, textRenderer()->allowTabs(), textPos(), m_toAdd,
+ direction() == RTL, m_dirOverride || style->visuallyOrdered()),
+ IntPoint(m_x + tx, y + ty), h, c, style->colorSpace(), sPos, ePos);
+ context->restore();
+}
+
+void InlineTextBox::paintCompositionBackground(GraphicsContext* context, int tx, int ty, RenderStyle* style, const Font& font, int startPos, int endPos)
+{
+ int offset = m_start;
+ int sPos = max(startPos - offset, 0);
+ int ePos = min(endPos - offset, (int)m_len);
+
+ if (sPos >= ePos)
+ return;
+
+ context->save();
+
+ Color c = Color(225, 221, 85);
+
+ updateGraphicsContext(context, c, c, 0, style->colorSpace()); // Don't draw text at all!
+
+ int y = selectionTop();
+ int h = selectionHeight();
+ context->drawHighlightForText(font, TextRun(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd,
+ direction() == RTL, m_dirOverride || style->visuallyOrdered()),
+ IntPoint(m_x + tx, y + ty), h, c, style->colorSpace(), sPos, ePos);
+ context->restore();
+}
+
+#if PLATFORM(MAC)
+
+void InlineTextBox::paintCustomHighlight(int tx, int ty, const AtomicString& type)
+{
+ Frame* frame = renderer()->frame();
+ if (!frame)
+ return;
+ Page* page = frame->page();
+ if (!page)
+ return;
+
+ RootInlineBox* r = root();
+ FloatRect rootRect(tx + r->x(), ty + selectionTop(), r->width(), selectionHeight());
+ FloatRect textRect(tx + x(), rootRect.y(), width(), rootRect.height());
+
+ page->chrome()->client()->paintCustomHighlight(renderer()->node(), type, textRect, rootRect, true, false);
+}
+
+#endif
+
+void InlineTextBox::paintDecoration(GraphicsContext* context, int tx, int ty, int deco, const ShadowData* shadow)
+{
+ tx += m_x;
+ ty += m_y;
+
+ if (m_truncation == cFullTruncation)
+ return;
+
+ int width = m_width;
+ if (m_truncation != cNoTruncation) {
+ width = toRenderText(renderer())->width(m_start, m_truncation, textPos(), m_firstLine);
+ if (direction() == RTL)
+ tx += (m_width - width);
+ }
+
+ // Get the text decoration colors.
+ Color underline, overline, linethrough;
+ renderer()->getTextDecorationColors(deco, underline, overline, linethrough, true);
+
+ // Use a special function for underlines to get the positioning exactly right.
+ bool isPrinting = textRenderer()->document()->printing();
+ context->setStrokeThickness(1.0f); // FIXME: We should improve this rule and not always just assume 1.
+
+ bool linesAreOpaque = !isPrinting && (!(deco & UNDERLINE) || underline.alpha() == 255) && (!(deco & OVERLINE) || overline.alpha() == 255) && (!(deco & LINE_THROUGH) || linethrough.alpha() == 255);
+
+ int baseline = renderer()->style(m_firstLine)->font().ascent();
+
+ bool setClip = false;
+ int extraOffset = 0;
+ if (!linesAreOpaque && shadow && shadow->next()) {
+ context->save();
+ IntRect clipRect(tx, ty, width, baseline + 2);
+ for (const ShadowData* s = shadow; s; s = s->next()) {
+ IntRect shadowRect(tx, ty, width, baseline + 2);
+ shadowRect.inflate(s->blur());
+ shadowRect.move(s->x(), s->y());
+ clipRect.unite(shadowRect);
+ extraOffset = max(extraOffset, max(0, s->y()) + s->blur());
+ }
+ context->save();
+ context->clip(clipRect);
+ extraOffset += baseline + 2;
+ ty += extraOffset;
+ setClip = true;
+ }
+
+ ColorSpace colorSpace = renderer()->style()->colorSpace();
+ bool setShadow = false;
+
+ do {
+ if (shadow) {
+ if (!shadow->next()) {
+ // The last set of lines paints normally inside the clip.
+ ty -= extraOffset;
+ extraOffset = 0;
+ }
+ context->setShadow(IntSize(shadow->x(), shadow->y() - extraOffset), shadow->blur(), shadow->color(), colorSpace);
+ setShadow = true;
+ shadow = shadow->next();
+ }
+
+ if (deco & UNDERLINE) {
+ context->setStrokeColor(underline, colorSpace);
+ context->setStrokeStyle(SolidStroke);
+ // Leave one pixel of white between the baseline and the underline.
+ context->drawLineForText(IntPoint(tx, ty + baseline + 1), width, isPrinting);
+ }
+ if (deco & OVERLINE) {
+ context->setStrokeColor(overline, colorSpace);
+ context->setStrokeStyle(SolidStroke);
+ context->drawLineForText(IntPoint(tx, ty), width, isPrinting);
+ }
+ if (deco & LINE_THROUGH) {
+ context->setStrokeColor(linethrough, colorSpace);
+ context->setStrokeStyle(SolidStroke);
+ context->drawLineForText(IntPoint(tx, ty + 2 * baseline / 3), width, isPrinting);
+ }
+ } while (shadow);
+
+ if (setClip)
+ context->restore();
+ else if (setShadow)
+ context->clearShadow();
+}
+
+void InlineTextBox::paintSpellingOrGrammarMarker(GraphicsContext* pt, int tx, int ty, const DocumentMarker& marker, RenderStyle* style, const Font& font, bool grammar)
+{
+ // Never print spelling/grammar markers (5327887)
+ if (textRenderer()->document()->printing())
+ return;
+
+ if (m_truncation == cFullTruncation)
+ return;
+
+ int start = 0; // start of line to draw, relative to tx
+ int width = m_width; // 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 = max<int>(marker.startOffset - m_start, 0);
+ int endPosition = min<int>(marker.endOffset - m_start, m_len);
+
+ if (m_truncation != cNoTruncation)
+ endPosition = min<int>(endPosition, m_truncation);
+
+ // Calculate start & width
+ IntPoint startPoint(tx + m_x, ty + selectionTop());
+ TextRun run(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride || style->visuallyOrdered());
+ int h = selectionHeight();
+
+ IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, startPoint, h, 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(-tx, -ty);
+ markerRect = renderer()->localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox();
+ renderer()->document()->setRenderedRectForMarker(renderer()->node(), marker, 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 = cMisspellingLineThickness;
+ int baseline = renderer()->style(m_firstLine)->font().ascent();
+ int descent = height() - baseline;
+ int underlineOffset;
+ if (descent <= (2 + lineThickness)) {
+ // Place the underline at the very bottom of the text in small/medium fonts.
+ underlineOffset = height() - lineThickness;
+ } else {
+ // In larger fonts, though, place the underline up near the baseline to prevent a big gap.
+ underlineOffset = baseline + 2;
+ }
+ pt->drawLineForMisspellingOrBadGrammar(IntPoint(tx + m_x + start, ty + m_y + underlineOffset), width, grammar);
+}
+
+void InlineTextBox::paintTextMatchMarker(GraphicsContext* pt, int tx, int ty, const 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 y = selectionTop();
+ int h = selectionHeight();
+
+ int sPos = max(marker.startOffset - m_start, (unsigned)0);
+ int ePos = min(marker.endOffset - m_start, (unsigned)m_len);
+ TextRun run(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride || style->visuallyOrdered());
+
+ // 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_x, y), h, sPos, ePos));
+ markerRect = renderer()->localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox();
+ renderer()->document()->setRenderedRectForMarker(renderer()->node(), marker, markerRect);
+
+ // Optionally highlight the text
+ if (renderer()->frame()->markedTextMatchesAreHighlighted()) {
+ Color color = marker.activeMatch ?
+ renderer()->theme()->platformActiveTextSearchHighlightColor() :
+ renderer()->theme()->platformInactiveTextSearchHighlightColor();
+ pt->save();
+ updateGraphicsContext(pt, color, color, 0, style->colorSpace()); // Don't draw text at all!
+ pt->clip(IntRect(tx + m_x, ty + y, m_width, h));
+ pt->drawHighlightForText(font, run, IntPoint(m_x + tx, y + ty), h, color, style->colorSpace(), sPos, ePos);
+ pt->restore();
+ }
+}
+
+void InlineTextBox::computeRectForReplacementMarker(int /*tx*/, int /*ty*/, const DocumentMarker& marker, RenderStyle* style, const Font& font)
+{
+ // Replacement markers are not actually drawn, but their rects need to be computed for hit testing.
+ int y = selectionTop();
+ int h = selectionHeight();
+
+ int sPos = max(marker.startOffset - m_start, (unsigned)0);
+ int ePos = min(marker.endOffset - m_start, (unsigned)m_len);
+ TextRun run(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride || style->visuallyOrdered());
+ IntPoint startPoint = IntPoint(m_x, y);
+
+ // Compute and store the rect associated with this marker.
+ IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, startPoint, h, sPos, ePos));
+ markerRect = renderer()->localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox();
+ renderer()->document()->setRenderedRectForMarker(renderer()->node(), marker, markerRect);
+}
+
+void InlineTextBox::paintDocumentMarkers(GraphicsContext* pt, int tx, int ty, RenderStyle* style, const Font& font, bool background)
+{
+ if (!renderer()->node())
+ return;
+
+ Vector<DocumentMarker> markers = renderer()->document()->markersForNode(renderer()->node());
+ Vector<DocumentMarker>::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++) {
+ const DocumentMarker& marker = *markerIt;
+
+ // Paint either the background markers or the foreground markers, but not both
+ switch (marker.type) {
+ case DocumentMarker::Grammar:
+ case DocumentMarker::Spelling:
+ case DocumentMarker::Replacement:
+ if (background)
+ continue;
+ break;
+
+ case DocumentMarker::TextMatch:
+ if (!background)
+ continue;
+ break;
+
+ default:
+ ASSERT_NOT_REACHED();
+ }
+
+ 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:
+ paintSpellingOrGrammarMarker(pt, tx, ty, marker, style, font, false);
+ break;
+ case DocumentMarker::Grammar:
+ paintSpellingOrGrammarMarker(pt, tx, ty, marker, style, font, true);
+ break;
+ case DocumentMarker::TextMatch:
+ paintTextMatchMarker(pt, tx, ty, marker, style, font);
+ break;
+ case DocumentMarker::Replacement:
+ computeRectForReplacementMarker(tx, ty, marker, style, font);
+ break;
+ default:
+ ASSERT_NOT_REACHED();
+ }
+
+ }
+}
+
+
+void InlineTextBox::paintCompositionUnderline(GraphicsContext* ctx, int tx, int ty, const CompositionUnderline& underline)
+{
+ tx += m_x;
+ ty += m_y;
+
+ if (m_truncation == cFullTruncation)
+ return;
+
+ int start = 0; // start of line to draw, relative to tx
+ int width = m_width; // how much line to draw
+ bool useWholeWidth = true;
+ unsigned paintStart = m_start;
+ unsigned paintEnd = end() + 1; // end points at the last char, not past it
+ if (paintStart <= underline.startOffset) {
+ paintStart = underline.startOffset;
+ useWholeWidth = false;
+ start = toRenderText(renderer())->width(m_start, paintStart - m_start, textPos(), m_firstLine);
+ }
+ if (paintEnd != underline.endOffset) { // end points at the last char, not past it
+ paintEnd = min(paintEnd, (unsigned)underline.endOffset);
+ useWholeWidth = false;
+ }
+ if (m_truncation != cNoTruncation) {
+ paintEnd = min(paintEnd, (unsigned)m_start + m_truncation);
+ useWholeWidth = false;
+ }
+ if (!useWholeWidth) {
+ width = toRenderText(renderer())->width(paintStart, paintEnd - paintStart, textPos() + start, m_firstLine);
+ }
+
+ // 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(m_firstLine)->font().ascent();
+ if (underline.thick && height() - 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, renderer()->style()->colorSpace());
+ ctx->setStrokeThickness(lineThickness);
+ ctx->drawLineForText(IntPoint(tx + start, ty + height() - lineThickness), width, textRenderer()->document()->printing());
+}
+
+int InlineTextBox::caretMinOffset() const
+{
+ return m_start;
+}
+
+int InlineTextBox::caretMaxOffset() const
+{
+ return m_start + m_len;
+}
+
+unsigned InlineTextBox::caretMaxRenderedOffset() const
+{
+ return m_start + m_len;
+}
+
+int InlineTextBox::textPos() const
+{
+ if (x() == 0)
+ return 0;
+
+ RenderBlock* blockElement = renderer()->containingBlock();
+ return direction() == RTL ? x() - blockElement->borderRight() - blockElement->paddingRight()
+ : x() - blockElement->borderLeft() - blockElement->paddingLeft();
+}
+
+int InlineTextBox::offsetForPosition(int _x, bool includePartialGlyphs) const
+{
+ if (isLineBreak())
+ return 0;
+
+ RenderText* text = toRenderText(renderer());
+ RenderStyle* style = text->style(m_firstLine);
+ const Font* f = &style->font();
+ return f->offsetForPosition(TextRun(textRenderer()->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride || style->visuallyOrdered()),
+ _x - m_x, includePartialGlyphs);
+}
+
+int InlineTextBox::positionForOffset(int offset) const
+{
+ ASSERT(offset >= m_start);
+ ASSERT(offset <= m_start + m_len);
+
+ if (isLineBreak())
+ return m_x;
+
+ RenderText* text = toRenderText(renderer());
+ const Font& f = text->style(m_firstLine)->font();
+ int from = direction() == RTL ? offset - m_start : 0;
+ int to = direction() == RTL ? m_len : offset - m_start;
+ // FIXME: Do we need to add rightBearing here?
+ return enclosingIntRect(f.selectionRectForText(TextRun(text->text()->characters() + m_start, m_len, textRenderer()->allowTabs(), textPos(), m_toAdd, direction() == RTL, m_dirOverride),
+ IntPoint(m_x, 0), 0, from, to)).right();
+}
+
+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;
+}
+
+} // namespace WebCore