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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "config.h" |
| 6 #include "core/paint/InlineTextBoxPainter.h" |
| 7 |
| 8 #include "core/dom/DocumentMarkerController.h" |
| 9 #include "core/dom/RenderedDocumentMarker.h" |
| 10 #include "core/editing/CompositionUnderline.h" |
| 11 #include "core/editing/CompositionUnderlineRangeFilter.h" |
| 12 #include "core/editing/Editor.h" |
| 13 #include "core/editing/InputMethodController.h" |
| 14 #include "core/frame/LocalFrame.h" |
| 15 #include "core/paint/BoxPainter.h" |
| 16 #include "core/rendering/InlineTextBox.h" |
| 17 #include "core/rendering/PaintInfo.h" |
| 18 #include "core/rendering/RenderBlock.h" |
| 19 #include "core/rendering/RenderCombineText.h" |
| 20 #include "core/rendering/RenderTheme.h" |
| 21 #include "core/rendering/TextPainter.h" |
| 22 |
| 23 namespace blink { |
| 24 |
| 25 typedef WTF::HashMap<const InlineTextBox*, TextBlobPtr> InlineTextBoxBlobCacheMa
p; |
| 26 static InlineTextBoxBlobCacheMap* gTextBlobCache; |
| 27 |
| 28 static const int misspellingLineThickness = 3; |
| 29 |
| 30 void InlineTextBoxPainter::removeFromTextBlobCache(InlineTextBox& inlineTextBox) |
| 31 { |
| 32 if (gTextBlobCache) |
| 33 gTextBlobCache->remove(&inlineTextBox); |
| 34 } |
| 35 |
| 36 void InlineTextBoxPainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintO
ffset) |
| 37 { |
| 38 if (m_inlineTextBox.isLineBreak() || !paintInfo.shouldPaintWithinRoot(&m_inl
ineTextBox.renderer()) || m_inlineTextBox.renderer().style()->visibility() != VI
SIBLE |
| 39 || m_inlineTextBox.truncation() == cFullTruncation || paintInfo.phase ==
PaintPhaseOutline || !m_inlineTextBox.len()) |
| 40 return; |
| 41 |
| 42 ASSERT(paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintP
haseChildOutlines); |
| 43 |
| 44 LayoutRect logicalVisualOverflow = m_inlineTextBox.logicalOverflowRect(); |
| 45 LayoutUnit logicalStart = logicalVisualOverflow.x() + (m_inlineTextBox.isHor
izontal() ? paintOffset.x() : paintOffset.y()); |
| 46 LayoutUnit logicalExtent = logicalVisualOverflow.width(); |
| 47 |
| 48 LayoutUnit paintEnd = m_inlineTextBox.isHorizontal() ? paintInfo.rect.maxX()
: paintInfo.rect.maxY(); |
| 49 LayoutUnit paintStart = m_inlineTextBox.isHorizontal() ? paintInfo.rect.x()
: paintInfo.rect.y(); |
| 50 |
| 51 // When subpixel font scaling is enabled text runs are positioned at |
| 52 // subpixel boundaries on the x-axis and thus there is no reason to |
| 53 // snap the x value. We still round the y-axis to ensure consistent |
| 54 // line heights. |
| 55 LayoutPoint adjustedPaintOffset = RuntimeEnabledFeatures::subpixelFontScalin
gEnabled() |
| 56 ? LayoutPoint(paintOffset.x(), paintOffset.y().round()) |
| 57 : roundedIntPoint(paintOffset); |
| 58 |
| 59 if (logicalStart >= paintEnd || logicalStart + logicalExtent <= paintStart) |
| 60 return; |
| 61 |
| 62 bool isPrinting = m_inlineTextBox.renderer().document().printing(); |
| 63 |
| 64 // Determine whether or not we're selected. |
| 65 bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip &&
m_inlineTextBox.selectionState() != RenderObject::SelectionNone; |
| 66 if (!haveSelection && paintInfo.phase == PaintPhaseSelection) { |
| 67 // When only painting the selection, don't bother to paint if there is n
one. |
| 68 return; |
| 69 } |
| 70 |
| 71 if (m_inlineTextBox.truncation() != cNoTruncation) { |
| 72 if (m_inlineTextBox.renderer().containingBlock()->style()->isLeftToRight
Direction() != m_inlineTextBox.isLeftToRightDirection()) { |
| 73 // Make the visible fragment of text hug the edge closest to the res
t of the run by moving the origin |
| 74 // at which we start drawing text. |
| 75 // e.g. In the case of LTR text truncated in an RTL Context, the cor
rect behavior is: |
| 76 // |Hello|CBA| -> |...He|CBA| |
| 77 // In order to draw the fragment "He" aligned to the right edge of i
t's box, we need to start drawing |
| 78 // farther to the right. |
| 79 // NOTE: WebKit's behavior differs from that of IE which appears to
just overlay the ellipsis on top of the |
| 80 // truncated string i.e. |Hello|CBA| -> |...lo|CBA| |
| 81 LayoutUnit widthOfVisibleText = m_inlineTextBox.renderer().width(m_i
nlineTextBox.start(), m_inlineTextBox.truncation(), m_inlineTextBox.textPos(), m
_inlineTextBox.isLeftToRightDirection() ? LTR : RTL, m_inlineTextBox.isFirstLine
Style()); |
| 82 LayoutUnit widthOfHiddenText = m_inlineTextBox.logicalWidth() - widt
hOfVisibleText; |
| 83 // FIXME: The hit testing logic also needs to take this translation
into account. |
| 84 LayoutSize truncationOffset(m_inlineTextBox.isLeftToRightDirection()
? widthOfHiddenText : -widthOfHiddenText, 0); |
| 85 adjustedPaintOffset.move(m_inlineTextBox.isHorizontal() ? truncation
Offset : truncationOffset.transposedSize()); |
| 86 } |
| 87 } |
| 88 |
| 89 GraphicsContext* context = paintInfo.context; |
| 90 RenderStyle* styleToUse = m_inlineTextBox.renderer().style(m_inlineTextBox.i
sFirstLineStyle()); |
| 91 |
| 92 adjustedPaintOffset.move(0, styleToUse->isHorizontalWritingMode() ? 0 : -m_i
nlineTextBox.logicalHeight()); |
| 93 |
| 94 FloatPoint boxOrigin = m_inlineTextBox.locationIncludingFlipping(); |
| 95 boxOrigin.move(adjustedPaintOffset.x().toFloat(), adjustedPaintOffset.y().to
Float()); |
| 96 FloatRect boxRect(boxOrigin, LayoutSize(m_inlineTextBox.logicalWidth(), m_in
lineTextBox.logicalHeight())); |
| 97 |
| 98 RenderCombineText* combinedText = styleToUse->hasTextCombine() && m_inlineTe
xtBox.renderer().isCombineText() && toRenderCombineText(m_inlineTextBox.renderer
()).isCombined() ? &toRenderCombineText(m_inlineTextBox.renderer()) : 0; |
| 99 |
| 100 bool shouldRotate = !m_inlineTextBox.isHorizontal() && !combinedText; |
| 101 if (shouldRotate) |
| 102 context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Clock
wise)); |
| 103 |
| 104 // Determine whether or not we have composition underlines to draw. |
| 105 bool containsComposition = m_inlineTextBox.renderer().node() && m_inlineText
Box.renderer().frame()->inputMethodController().compositionNode() == m_inlineTex
tBox.renderer().node(); |
| 106 bool useCustomUnderlines = containsComposition && m_inlineTextBox.renderer()
.frame()->inputMethodController().compositionUsesCustomUnderlines(); |
| 107 |
| 108 // Determine text colors. |
| 109 TextPainter::Style textStyle = TextPainter::textPaintingStyle(m_inlineTextBo
x.renderer(), styleToUse, paintInfo.forceBlackText(), isPrinting); |
| 110 TextPainter::Style selectionStyle = TextPainter::selectionPaintingStyle(m_in
lineTextBox.renderer(), haveSelection, paintInfo.forceBlackText(), isPrinting, t
extStyle); |
| 111 bool paintSelectedTextOnly = (paintInfo.phase == PaintPhaseSelection); |
| 112 bool paintSelectedTextSeparately = !paintSelectedTextOnly && textStyle != se
lectionStyle; |
| 113 |
| 114 // Set our font. |
| 115 const Font& font = styleToUse->font(); |
| 116 |
| 117 FloatPoint textOrigin = FloatPoint(boxOrigin.x(), boxOrigin.y() + font.fontM
etrics().ascent()); |
| 118 if (combinedText) |
| 119 combinedText->adjustTextOrigin(textOrigin, boxRect); |
| 120 |
| 121 // 1. Paint backgrounds behind text if needed. Examples of such backgrounds
include selection |
| 122 // and composition highlights. |
| 123 if (paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseT
extClip && !isPrinting) { |
| 124 if (containsComposition) { |
| 125 paintCompositionBackgrounds(context, boxOrigin, styleToUse, font, us
eCustomUnderlines); |
| 126 } |
| 127 |
| 128 paintDocumentMarkers(context, boxOrigin, styleToUse, font, true); |
| 129 |
| 130 if (haveSelection && !useCustomUnderlines) |
| 131 paintSelection(context, boxOrigin, styleToUse, font, selectionStyle.
fillColor); |
| 132 } |
| 133 |
| 134 // 2. Now paint the foreground, including text and decorations like underlin
e/overline (in quirks mode only). |
| 135 int length = m_inlineTextBox.len(); |
| 136 int maximumLength; |
| 137 StringView string; |
| 138 if (!combinedText) { |
| 139 string = m_inlineTextBox.renderer().text().createView(); |
| 140 if (static_cast<unsigned>(length) != string.length() || m_inlineTextBox.
start()) |
| 141 string.narrow(m_inlineTextBox.start(), length); |
| 142 maximumLength = m_inlineTextBox.renderer().textLength() - m_inlineTextBo
x.start(); |
| 143 } else { |
| 144 combinedText->getStringToRender(m_inlineTextBox.start(), string, length)
; |
| 145 maximumLength = length; |
| 146 } |
| 147 |
| 148 StringBuilder charactersWithHyphen; |
| 149 TextRun textRun = m_inlineTextBox.constructTextRun(styleToUse, font, string,
maximumLength, m_inlineTextBox.hasHyphen() ? &charactersWithHyphen : 0); |
| 150 if (m_inlineTextBox.hasHyphen()) |
| 151 length = textRun.length(); |
| 152 |
| 153 int selectionStart = 0; |
| 154 int selectionEnd = 0; |
| 155 if (paintSelectedTextOnly || paintSelectedTextSeparately) |
| 156 m_inlineTextBox.selectionStartEnd(selectionStart, selectionEnd); |
| 157 |
| 158 bool respectHyphen = selectionEnd == static_cast<int>(m_inlineTextBox.len())
&& m_inlineTextBox.hasHyphen(); |
| 159 if (respectHyphen) |
| 160 selectionEnd = textRun.length(); |
| 161 |
| 162 if (m_inlineTextBox.truncation() != cNoTruncation) { |
| 163 selectionStart = std::min<int>(selectionStart, m_inlineTextBox.truncatio
n()); |
| 164 selectionEnd = std::min<int>(selectionEnd, m_inlineTextBox.truncation())
; |
| 165 length = m_inlineTextBox.truncation(); |
| 166 } |
| 167 |
| 168 TextPainter textPainter(context, font, textRun, textOrigin, boxRect, m_inlin
eTextBox.isHorizontal()); |
| 169 TextEmphasisPosition emphasisMarkPosition; |
| 170 bool hasTextEmphasis = m_inlineTextBox.getEmphasisMarkPosition(styleToUse, e
mphasisMarkPosition); |
| 171 if (hasTextEmphasis) |
| 172 textPainter.setEmphasisMark(styleToUse->textEmphasisMarkString(), emphas
isMarkPosition); |
| 173 if (combinedText) |
| 174 textPainter.setCombinedText(combinedText); |
| 175 |
| 176 if (!paintSelectedTextOnly) { |
| 177 // FIXME: Truncate right-to-left text correctly. |
| 178 int startOffset = 0; |
| 179 int endOffset = length; |
| 180 if (paintSelectedTextSeparately && selectionStart < selectionEnd) { |
| 181 startOffset = selectionEnd; |
| 182 endOffset = selectionStart; |
| 183 } |
| 184 |
| 185 // FIXME: This cache should probably ultimately be held somewhere else. |
| 186 // A hashmap is convenient to avoid a memory hit when the |
| 187 // RuntimeEnabledFeature is off. |
| 188 bool textBlobIsCacheable = RuntimeEnabledFeatures::textBlobEnabled() &&
startOffset == 0 && endOffset == length; |
| 189 TextBlobPtr* cachedTextBlob = 0; |
| 190 if (textBlobIsCacheable) { |
| 191 if (!gTextBlobCache) |
| 192 gTextBlobCache = new InlineTextBoxBlobCacheMap; |
| 193 cachedTextBlob = &gTextBlobCache->add(&m_inlineTextBox, nullptr).sto
redValue->value; |
| 194 } |
| 195 textPainter.paint(startOffset, endOffset, length, textStyle, cachedTextB
lob); |
| 196 } |
| 197 |
| 198 if ((paintSelectedTextOnly || paintSelectedTextSeparately) && selectionStart
< selectionEnd) { |
| 199 // paint only the text that is selected |
| 200 textPainter.paint(selectionStart, selectionEnd, length, selectionStyle); |
| 201 } |
| 202 |
| 203 // Paint decorations |
| 204 TextDecoration textDecorations = styleToUse->textDecorationsInEffect(); |
| 205 if (textDecorations != TextDecorationNone && !paintSelectedTextOnly) { |
| 206 GraphicsContextStateSaver stateSaver(*context, false); |
| 207 TextPainter::updateGraphicsContext(context, textStyle, m_inlineTextBox.i
sHorizontal(), stateSaver); |
| 208 if (combinedText) |
| 209 context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::C
lockwise)); |
| 210 paintDecoration(context, boxOrigin, textDecorations); |
| 211 if (combinedText) |
| 212 context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::C
ounterclockwise)); |
| 213 } |
| 214 |
| 215 if (paintInfo.phase == PaintPhaseForeground) { |
| 216 paintDocumentMarkers(context, boxOrigin, styleToUse, font, false); |
| 217 |
| 218 // Paint custom underlines for compositions. |
| 219 if (useCustomUnderlines) { |
| 220 const Vector<CompositionUnderline>& underlines = m_inlineTextBox.ren
derer().frame()->inputMethodController().customCompositionUnderlines(); |
| 221 CompositionUnderlineRangeFilter filter(underlines, m_inlineTextBox.s
tart(), m_inlineTextBox.end()); |
| 222 for (CompositionUnderlineRangeFilter::ConstIterator it = filter.begi
n(); it != filter.end(); ++it) { |
| 223 if (it->color == Color::transparent) |
| 224 continue; |
| 225 paintCompositionUnderline(context, boxOrigin, *it); |
| 226 } |
| 227 } |
| 228 } |
| 229 |
| 230 if (shouldRotate) |
| 231 context->concatCTM(InlineTextBox::rotation(boxRect, InlineTextBox::Count
erclockwise)); |
| 232 } |
| 233 |
| 234 unsigned InlineTextBoxPainter::underlinePaintStart(const CompositionUnderline& u
nderline) |
| 235 { |
| 236 return std::max(static_cast<unsigned>(m_inlineTextBox.start()), underline.st
artOffset); |
| 237 } |
| 238 |
| 239 unsigned InlineTextBoxPainter::underlinePaintEnd(const CompositionUnderline& und
erline) |
| 240 { |
| 241 unsigned paintEnd = std::min(m_inlineTextBox.end() + 1, underline.endOffset)
; // end() points at the last char, not past it. |
| 242 if (m_inlineTextBox.truncation() != cNoTruncation) |
| 243 paintEnd = std::min(paintEnd, static_cast<unsigned>(m_inlineTextBox.star
t() + m_inlineTextBox.truncation())); |
| 244 return paintEnd; |
| 245 } |
| 246 |
| 247 void InlineTextBoxPainter::paintCompositionBackgrounds(GraphicsContext* pt, cons
t FloatPoint& boxOrigin, RenderStyle* style, const Font& font, bool useCustomUnd
erlines) |
| 248 { |
| 249 if (useCustomUnderlines) { |
| 250 // Paint custom background highlights for compositions. |
| 251 const Vector<CompositionUnderline>& underlines = m_inlineTextBox.rendere
r().frame()->inputMethodController().customCompositionUnderlines(); |
| 252 CompositionUnderlineRangeFilter filter(underlines, m_inlineTextBox.start
(), m_inlineTextBox.end()); |
| 253 for (CompositionUnderlineRangeFilter::ConstIterator it = filter.begin();
it != filter.end(); ++it) { |
| 254 if (it->backgroundColor == Color::transparent) |
| 255 continue; |
| 256 paintSingleCompositionBackgroundRun(pt, boxOrigin, style, font, it->
backgroundColor, underlinePaintStart(*it), underlinePaintEnd(*it)); |
| 257 } |
| 258 |
| 259 } else { |
| 260 paintSingleCompositionBackgroundRun(pt, boxOrigin, style, font, RenderTh
eme::theme().platformDefaultCompositionBackgroundColor(), |
| 261 m_inlineTextBox.renderer().frame()->inputMethodController().composit
ionStart(), |
| 262 m_inlineTextBox.renderer().frame()->inputMethodController().composit
ionEnd()); |
| 263 } |
| 264 } |
| 265 |
| 266 void InlineTextBoxPainter::paintSingleCompositionBackgroundRun(GraphicsContext*
context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, Colo
r backgroundColor, int startPos, int endPos) |
| 267 { |
| 268 int sPos = std::max(startPos - static_cast<int>(m_inlineTextBox.start()), 0)
; |
| 269 int ePos = std::min(endPos - static_cast<int>(m_inlineTextBox.start()), stat
ic_cast<int>(m_inlineTextBox.len())); |
| 270 if (sPos >= ePos) |
| 271 return; |
| 272 |
| 273 int deltaY = m_inlineTextBox.renderer().style()->isFlippedLinesWritingMode()
? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom() :
m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
| 274 int selHeight = m_inlineTextBox.root().selectionHeight(); |
| 275 FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY); |
| 276 context->drawHighlightForText(font, m_inlineTextBox.constructTextRun(style,
font), localOrigin, selHeight, backgroundColor, sPos, ePos); |
| 277 } |
| 278 |
| 279 void InlineTextBoxPainter::paintDocumentMarkers(GraphicsContext* pt, const Float
Point& boxOrigin, RenderStyle* style, const Font& font, bool background) |
| 280 { |
| 281 if (!m_inlineTextBox.renderer().node()) |
| 282 return; |
| 283 |
| 284 DocumentMarkerVector markers = m_inlineTextBox.renderer().document().markers
().markersFor(m_inlineTextBox.renderer().node()); |
| 285 DocumentMarkerVector::const_iterator markerIt = markers.begin(); |
| 286 |
| 287 // Give any document markers that touch this run a chance to draw before the
text has been drawn. |
| 288 // Note end() points at the last char, not one past it like endOffset and ra
nges do. |
| 289 for ( ; markerIt != markers.end(); ++markerIt) { |
| 290 DocumentMarker* marker = *markerIt; |
| 291 |
| 292 // Paint either the background markers or the foreground markers, but no
t both |
| 293 switch (marker->type()) { |
| 294 case DocumentMarker::Grammar: |
| 295 case DocumentMarker::Spelling: |
| 296 if (background) |
| 297 continue; |
| 298 break; |
| 299 case DocumentMarker::TextMatch: |
| 300 if (!background) |
| 301 continue; |
| 302 break; |
| 303 default: |
| 304 continue; |
| 305 } |
| 306 |
| 307 if (marker->endOffset() <= m_inlineTextBox.start()) { |
| 308 // marker is completely before this run. This might be a marker tha
t sits before the |
| 309 // first run we draw, or markers that were within runs we skipped du
e to truncation. |
| 310 continue; |
| 311 } |
| 312 if (marker->startOffset() > m_inlineTextBox.end()) { |
| 313 // marker is completely after this run, bail. A later run will pain
t it. |
| 314 break; |
| 315 } |
| 316 |
| 317 // marker intersects this run. Paint it. |
| 318 switch (marker->type()) { |
| 319 case DocumentMarker::Spelling: |
| 320 m_inlineTextBox.paintDocumentMarker(pt, boxOrigin, marker, style, fo
nt, false); |
| 321 break; |
| 322 case DocumentMarker::Grammar: |
| 323 m_inlineTextBox.paintDocumentMarker(pt, boxOrigin, marker, style, fo
nt, true); |
| 324 break; |
| 325 case DocumentMarker::TextMatch: |
| 326 m_inlineTextBox.paintTextMatchMarker(pt, boxOrigin, marker, style, f
ont); |
| 327 break; |
| 328 default: |
| 329 ASSERT_NOT_REACHED(); |
| 330 } |
| 331 } |
| 332 } |
| 333 |
| 334 static GraphicsContext::DocumentMarkerLineStyle lineStyleForMarkerType(DocumentM
arker::MarkerType markerType) |
| 335 { |
| 336 switch (markerType) { |
| 337 case DocumentMarker::Spelling: |
| 338 return GraphicsContext::DocumentMarkerSpellingLineStyle; |
| 339 case DocumentMarker::Grammar: |
| 340 return GraphicsContext::DocumentMarkerGrammarLineStyle; |
| 341 default: |
| 342 ASSERT_NOT_REACHED(); |
| 343 return GraphicsContext::DocumentMarkerSpellingLineStyle; |
| 344 } |
| 345 } |
| 346 |
| 347 void InlineTextBoxPainter::paintDocumentMarker(GraphicsContext* pt, const FloatP
oint& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font, b
ool grammar) |
| 348 { |
| 349 // Never print spelling/grammar markers (5327887) |
| 350 if (m_inlineTextBox.renderer().document().printing()) |
| 351 return; |
| 352 |
| 353 if (m_inlineTextBox.truncation() == cFullTruncation) |
| 354 return; |
| 355 |
| 356 float start = 0; // start of line to draw, relative to tx |
| 357 float width = m_inlineTextBox.logicalWidth(); // how much line to draw |
| 358 |
| 359 // Determine whether we need to measure text |
| 360 bool markerSpansWholeBox = true; |
| 361 if (m_inlineTextBox.start() <= marker->startOffset()) |
| 362 markerSpansWholeBox = false; |
| 363 if ((m_inlineTextBox.end() + 1) != marker->endOffset()) // end points at the
last char, not past it |
| 364 markerSpansWholeBox = false; |
| 365 if (m_inlineTextBox.truncation() != cNoTruncation) |
| 366 markerSpansWholeBox = false; |
| 367 |
| 368 if (!markerSpansWholeBox || grammar) { |
| 369 int startPosition = std::max<int>(marker->startOffset() - m_inlineTextBo
x.start(), 0); |
| 370 int endPosition = std::min<int>(marker->endOffset() - static_cast<int>(m
_inlineTextBox.start()), m_inlineTextBox.len()); |
| 371 |
| 372 if (m_inlineTextBox.truncation() != cNoTruncation) |
| 373 endPosition = std::min<int>(endPosition, m_inlineTextBox.truncation(
)); |
| 374 |
| 375 // Calculate start & width |
| 376 int deltaY = m_inlineTextBox.renderer().style()->isFlippedLinesWritingMo
de() ? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom(
) : m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
| 377 int selHeight = m_inlineTextBox.root().selectionHeight(); |
| 378 FloatPoint startPoint(boxOrigin.x(), boxOrigin.y() - deltaY); |
| 379 TextRun run = m_inlineTextBox.constructTextRun(style, font); |
| 380 |
| 381 // FIXME: Convert the document markers to float rects. |
| 382 IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, sta
rtPoint, selHeight, startPosition, endPosition)); |
| 383 start = markerRect.x() - startPoint.x(); |
| 384 width = markerRect.width(); |
| 385 |
| 386 // Store rendered rects for bad grammar markers, so we can hit-test agai
nst it elsewhere in order to |
| 387 // display a toolTip. We don't do this for misspelling markers. |
| 388 if (grammar) { |
| 389 markerRect.move(-boxOrigin.x(), -boxOrigin.y()); |
| 390 markerRect = m_inlineTextBox.renderer().localToAbsoluteQuad(FloatRec
t(markerRect)).enclosingBoundingBox(); |
| 391 toRenderedDocumentMarker(marker)->setRenderedRect(markerRect); |
| 392 } |
| 393 } |
| 394 |
| 395 // IMPORTANT: The misspelling underline is not considered when calculating t
he text bounds, so we have to |
| 396 // make sure to fit within those bounds. This means the top pixel(s) of the
underline will overlap the |
| 397 // bottom pixel(s) of the glyphs in smaller font sizes. The alternatives ar
e to increase the line spacing (bad!!) |
| 398 // or decrease the underline thickness. The overlap is actually the most us
eful, and matches what AppKit does. |
| 399 // So, we generally place the underline at the bottom of the text, but in la
rger fonts that's not so good so |
| 400 // we pin to two pixels under the baseline. |
| 401 int lineThickness = misspellingLineThickness; |
| 402 int baseline = m_inlineTextBox.renderer().style(m_inlineTextBox.isFirstLineS
tyle())->fontMetrics().ascent(); |
| 403 int descent = m_inlineTextBox.logicalHeight() - baseline; |
| 404 int underlineOffset; |
| 405 if (descent <= (2 + lineThickness)) { |
| 406 // Place the underline at the very bottom of the text in small/medium fo
nts. |
| 407 underlineOffset = m_inlineTextBox.logicalHeight() - lineThickness; |
| 408 } else { |
| 409 // In larger fonts, though, place the underline up near the baseline to
prevent a big gap. |
| 410 underlineOffset = baseline + 2; |
| 411 } |
| 412 pt->drawLineForDocumentMarker(FloatPoint(boxOrigin.x() + start, boxOrigin.y(
) + underlineOffset), width, lineStyleForMarkerType(marker->type())); |
| 413 } |
| 414 |
| 415 void InlineTextBoxPainter::paintSelection(GraphicsContext* context, const FloatP
oint& boxOrigin, RenderStyle* style, const Font& font, Color textColor) |
| 416 { |
| 417 // See if we have a selection to paint at all. |
| 418 int sPos, ePos; |
| 419 m_inlineTextBox.selectionStartEnd(sPos, ePos); |
| 420 if (sPos >= ePos) |
| 421 return; |
| 422 |
| 423 Color c = m_inlineTextBox.renderer().selectionBackgroundColor(); |
| 424 if (!c.alpha()) |
| 425 return; |
| 426 |
| 427 // If the text color ends up being the same as the selection background, inv
ert the selection |
| 428 // background. |
| 429 if (textColor == c) |
| 430 c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue()); |
| 431 |
| 432 // If the text is truncated, let the thing being painted in the truncation |
| 433 // draw its own highlight. |
| 434 int length = m_inlineTextBox.truncation() != cNoTruncation ? m_inlineTextBox
.truncation() : m_inlineTextBox.len(); |
| 435 StringView string = m_inlineTextBox.renderer().text().createView(); |
| 436 |
| 437 if (string.length() != static_cast<unsigned>(length) || m_inlineTextBox.star
t()) |
| 438 string.narrow(m_inlineTextBox.start(), length); |
| 439 |
| 440 StringBuilder charactersWithHyphen; |
| 441 bool respectHyphen = ePos == length && m_inlineTextBox.hasHyphen(); |
| 442 TextRun textRun = m_inlineTextBox.constructTextRun(style, font, string, m_in
lineTextBox.renderer().textLength() - m_inlineTextBox.start(), respectHyphen ? &
charactersWithHyphen : 0); |
| 443 if (respectHyphen) |
| 444 ePos = textRun.length(); |
| 445 |
| 446 LayoutUnit selectionBottom = m_inlineTextBox.root().selectionBottom(); |
| 447 LayoutUnit selectionTop = m_inlineTextBox.root().selectionTopAdjustedForPrec
edingBlock(); |
| 448 |
| 449 int deltaY = roundToInt(m_inlineTextBox.renderer().style()->isFlippedLinesWr
itingMode() ? selectionBottom - m_inlineTextBox.logicalBottom() : m_inlineTextBo
x.logicalTop() - selectionTop); |
| 450 int selHeight = std::max(0, roundToInt(selectionBottom - selectionTop)); |
| 451 |
| 452 FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY); |
| 453 FloatRect clipRect(localOrigin, FloatSize(m_inlineTextBox.logicalWidth(), se
lHeight)); |
| 454 |
| 455 GraphicsContextStateSaver stateSaver(*context); |
| 456 context->clip(clipRect); |
| 457 context->drawHighlightForText(font, textRun, localOrigin, selHeight, c, sPos
, ePos); |
| 458 } |
| 459 |
| 460 static int computeUnderlineOffset(const TextUnderlinePosition underlinePosition,
const FontMetrics& fontMetrics, const InlineTextBox* inlineTextBox, const float
textDecorationThickness) |
| 461 { |
| 462 // Compute the gap between the font and the underline. Use at least one |
| 463 // pixel gap, if underline is thick then use a bigger gap. |
| 464 int gap = 0; |
| 465 |
| 466 // Underline position of zero means draw underline on Baseline Position, |
| 467 // in Blink we need at least 1-pixel gap to adding following check. |
| 468 // Positive underline Position means underline should be drawn above baselin
e |
| 469 // and negative value means drawing below baseline, negating the value as in
Blink |
| 470 // downward Y-increases. |
| 471 |
| 472 if (fontMetrics.underlinePosition()) |
| 473 gap = -fontMetrics.underlinePosition(); |
| 474 else |
| 475 gap = std::max<int>(1, ceilf(textDecorationThickness / 2.f)); |
| 476 |
| 477 // FIXME: We support only horizontal text for now. |
| 478 switch (underlinePosition) { |
| 479 case TextUnderlinePositionAuto: |
| 480 return fontMetrics.ascent() + gap; // Position underline near the alphab
etic baseline. |
| 481 case TextUnderlinePositionUnder: { |
| 482 // Position underline relative to the under edge of the lowest element's
content box. |
| 483 const float offset = inlineTextBox->root().maxLogicalTop() - inlineTextB
ox->logicalTop(); |
| 484 if (offset > 0) |
| 485 return inlineTextBox->logicalHeight() + gap + offset; |
| 486 return inlineTextBox->logicalHeight() + gap; |
| 487 } |
| 488 } |
| 489 |
| 490 ASSERT_NOT_REACHED(); |
| 491 return fontMetrics.ascent() + gap; |
| 492 } |
| 493 |
| 494 static bool shouldSetDecorationAntialias(TextDecorationStyle decorationStyle) |
| 495 { |
| 496 return decorationStyle == TextDecorationStyleDotted || decorationStyle == Te
xtDecorationStyleDashed; |
| 497 } |
| 498 |
| 499 static bool shouldSetDecorationAntialias(TextDecorationStyle underline, TextDeco
rationStyle overline, TextDecorationStyle linethrough) |
| 500 { |
| 501 return shouldSetDecorationAntialias(underline) || shouldSetDecorationAntiali
as(overline) || shouldSetDecorationAntialias(linethrough); |
| 502 } |
| 503 |
| 504 static StrokeStyle textDecorationStyleToStrokeStyle(TextDecorationStyle decorati
onStyle) |
| 505 { |
| 506 StrokeStyle strokeStyle = SolidStroke; |
| 507 switch (decorationStyle) { |
| 508 case TextDecorationStyleSolid: |
| 509 strokeStyle = SolidStroke; |
| 510 break; |
| 511 case TextDecorationStyleDouble: |
| 512 strokeStyle = DoubleStroke; |
| 513 break; |
| 514 case TextDecorationStyleDotted: |
| 515 strokeStyle = DottedStroke; |
| 516 break; |
| 517 case TextDecorationStyleDashed: |
| 518 strokeStyle = DashedStroke; |
| 519 break; |
| 520 case TextDecorationStyleWavy: |
| 521 strokeStyle = WavyStroke; |
| 522 break; |
| 523 } |
| 524 |
| 525 return strokeStyle; |
| 526 } |
| 527 |
| 528 static void adjustStepToDecorationLength(float& step, float& controlPointDistanc
e, float length) |
| 529 { |
| 530 ASSERT(step > 0); |
| 531 |
| 532 if (length <= 0) |
| 533 return; |
| 534 |
| 535 unsigned stepCount = static_cast<unsigned>(length / step); |
| 536 |
| 537 // Each Bezier curve starts at the same pixel that the previous one |
| 538 // ended. We need to subtract (stepCount - 1) pixels when calculating the |
| 539 // length covered to account for that. |
| 540 float uncoveredLength = length - (stepCount * step - (stepCount - 1)); |
| 541 float adjustment = uncoveredLength / stepCount; |
| 542 step += adjustment; |
| 543 controlPointDistance += adjustment; |
| 544 } |
| 545 |
| 546 /* |
| 547 * Draw one cubic Bezier curve and repeat the same pattern long the the decorati
on's axis. |
| 548 * The start point (p1), controlPoint1, controlPoint2 and end point (p2) of the
Bezier curve |
| 549 * form a diamond shape: |
| 550 * |
| 551 * step |
| 552 * |-----------| |
| 553 * |
| 554 * controlPoint1 |
| 555 * + |
| 556 * |
| 557 * |
| 558 * . . |
| 559 * . . |
| 560 * . . |
| 561 * (x1, y1) p1 + . + p2 (x2, y2) - <--- Decoration's axis |
| 562 * . . | |
| 563 * . . | |
| 564 * . . | controlPointDistance |
| 565 * | |
| 566 * | |
| 567 * + - |
| 568 * controlPoint2 |
| 569 * |
| 570 * |-----------| |
| 571 * step |
| 572 */ |
| 573 static void strokeWavyTextDecoration(GraphicsContext* context, FloatPoint p1, Fl
oatPoint p2, float strokeThickness) |
| 574 { |
| 575 context->adjustLineToPixelBoundaries(p1, p2, strokeThickness, context->strok
eStyle()); |
| 576 |
| 577 Path path; |
| 578 path.moveTo(p1); |
| 579 |
| 580 // Distance between decoration's axis and Bezier curve's control points. |
| 581 // The height of the curve is based on this distance. Use a minimum of 6 pix
els distance since |
| 582 // the actual curve passes approximately at half of that distance, that is 3
pixels. |
| 583 // The minimum height of the curve is also approximately 3 pixels. Increases
the curve's height |
| 584 // as strockThickness increases to make the curve looks better. |
| 585 float controlPointDistance = 3 * std::max<float>(2, strokeThickness); |
| 586 |
| 587 // Increment used to form the diamond shape between start point (p1), contro
l |
| 588 // points and end point (p2) along the axis of the decoration. Makes the |
| 589 // curve wider as strockThickness increases to make the curve looks better. |
| 590 float step = 2 * std::max<float>(2, strokeThickness); |
| 591 |
| 592 bool isVerticalLine = (p1.x() == p2.x()); |
| 593 |
| 594 if (isVerticalLine) { |
| 595 ASSERT(p1.x() == p2.x()); |
| 596 |
| 597 float xAxis = p1.x(); |
| 598 float y1; |
| 599 float y2; |
| 600 |
| 601 if (p1.y() < p2.y()) { |
| 602 y1 = p1.y(); |
| 603 y2 = p2.y(); |
| 604 } else { |
| 605 y1 = p2.y(); |
| 606 y2 = p1.y(); |
| 607 } |
| 608 |
| 609 adjustStepToDecorationLength(step, controlPointDistance, y2 - y1); |
| 610 FloatPoint controlPoint1(xAxis + controlPointDistance, 0); |
| 611 FloatPoint controlPoint2(xAxis - controlPointDistance, 0); |
| 612 |
| 613 for (float y = y1; y + 2 * step <= y2;) { |
| 614 controlPoint1.setY(y + step); |
| 615 controlPoint2.setY(y + step); |
| 616 y += 2 * step; |
| 617 path.addBezierCurveTo(controlPoint1, controlPoint2, FloatPoint(xAxis
, y)); |
| 618 } |
| 619 } else { |
| 620 ASSERT(p1.y() == p2.y()); |
| 621 |
| 622 float yAxis = p1.y(); |
| 623 float x1; |
| 624 float x2; |
| 625 |
| 626 if (p1.x() < p2.x()) { |
| 627 x1 = p1.x(); |
| 628 x2 = p2.x(); |
| 629 } else { |
| 630 x1 = p2.x(); |
| 631 x2 = p1.x(); |
| 632 } |
| 633 |
| 634 adjustStepToDecorationLength(step, controlPointDistance, x2 - x1); |
| 635 FloatPoint controlPoint1(0, yAxis + controlPointDistance); |
| 636 FloatPoint controlPoint2(0, yAxis - controlPointDistance); |
| 637 |
| 638 for (float x = x1; x + 2 * step <= x2;) { |
| 639 controlPoint1.setX(x + step); |
| 640 controlPoint2.setX(x + step); |
| 641 x += 2 * step; |
| 642 path.addBezierCurveTo(controlPoint1, controlPoint2, FloatPoint(x, yA
xis)); |
| 643 } |
| 644 } |
| 645 |
| 646 context->setShouldAntialias(true); |
| 647 context->strokePath(path); |
| 648 } |
| 649 |
| 650 static void paintAppliedDecoration(GraphicsContext* context, FloatPoint start, f
loat width, float doubleOffset, int wavyOffsetFactor, |
| 651 RenderObject::AppliedTextDecoration decoration, float thickness, bool antial
iasDecoration, bool isPrinting) |
| 652 { |
| 653 context->setStrokeStyle(textDecorationStyleToStrokeStyle(decoration.style)); |
| 654 context->setStrokeColor(decoration.color); |
| 655 |
| 656 switch (decoration.style) { |
| 657 case TextDecorationStyleWavy: |
| 658 strokeWavyTextDecoration(context, start + FloatPoint(0, doubleOffset * w
avyOffsetFactor), start + FloatPoint(width, doubleOffset * wavyOffsetFactor), th
ickness); |
| 659 break; |
| 660 case TextDecorationStyleDotted: |
| 661 case TextDecorationStyleDashed: |
| 662 context->setShouldAntialias(antialiasDecoration); |
| 663 // Fall through |
| 664 default: |
| 665 context->drawLineForText(start, width, isPrinting); |
| 666 |
| 667 if (decoration.style == TextDecorationStyleDouble) |
| 668 context->drawLineForText(start + FloatPoint(0, doubleOffset), width,
isPrinting); |
| 669 } |
| 670 } |
| 671 |
| 672 void InlineTextBoxPainter::paintDecoration(GraphicsContext* context, const Float
Point& boxOrigin, TextDecoration deco) |
| 673 { |
| 674 GraphicsContextStateSaver stateSaver(*context); |
| 675 |
| 676 if (m_inlineTextBox.truncation() == cFullTruncation) |
| 677 return; |
| 678 |
| 679 FloatPoint localOrigin = boxOrigin; |
| 680 |
| 681 float width = m_inlineTextBox.logicalWidth(); |
| 682 if (m_inlineTextBox.truncation() != cNoTruncation) { |
| 683 width = m_inlineTextBox.renderer().width(m_inlineTextBox.start(), m_inli
neTextBox.truncation(), m_inlineTextBox.textPos(), m_inlineTextBox.isLeftToRight
Direction() ? LTR : RTL, m_inlineTextBox.isFirstLineStyle()); |
| 684 if (!m_inlineTextBox.isLeftToRightDirection()) |
| 685 localOrigin.move(m_inlineTextBox.logicalWidth() - width, 0); |
| 686 } |
| 687 |
| 688 // Get the text decoration colors. |
| 689 RenderObject::AppliedTextDecoration underline, overline, linethrough; |
| 690 m_inlineTextBox.renderer().getTextDecorations(deco, underline, overline, lin
ethrough, true); |
| 691 if (m_inlineTextBox.isFirstLineStyle()) |
| 692 m_inlineTextBox.renderer().getTextDecorations(deco, underline, overline,
linethrough, true, true); |
| 693 |
| 694 // Use a special function for underlines to get the positioning exactly righ
t. |
| 695 bool isPrinting = m_inlineTextBox.renderer().document().printing(); |
| 696 |
| 697 RenderStyle* styleToUse = m_inlineTextBox.renderer().style(m_inlineTextBox.i
sFirstLineStyle()); |
| 698 int baseline = styleToUse->fontMetrics().ascent(); |
| 699 |
| 700 // Set the thick of the line to be 10% (or something else ?)of the computed
font size and not less than 1px. |
| 701 // Using computedFontSize should take care of zoom as well. |
| 702 |
| 703 // Update Underline thickness, in case we have Faulty Font Metrics calculati
ng underline thickness by old method. |
| 704 float textDecorationThickness = styleToUse->fontMetrics().underlineThickness
(); |
| 705 int fontHeightInt = (int)(styleToUse->fontMetrics().floatHeight() + 0.5); |
| 706 if ((textDecorationThickness == 0.f) || (textDecorationThickness >= (fontHei
ghtInt >> 1))) |
| 707 textDecorationThickness = std::max(1.f, styleToUse->computedFontSize() /
10.f); |
| 708 |
| 709 context->setStrokeThickness(textDecorationThickness); |
| 710 |
| 711 bool antialiasDecoration = shouldSetDecorationAntialias(overline.style, unde
rline.style, linethrough.style) |
| 712 && BoxPainter::shouldAntialiasLines(context); |
| 713 |
| 714 // Offset between lines - always non-zero, so lines never cross each other. |
| 715 float doubleOffset = textDecorationThickness + 1.f; |
| 716 |
| 717 if (deco & TextDecorationUnderline) { |
| 718 const int underlineOffset = computeUnderlineOffset(styleToUse->textUnder
linePosition(), styleToUse->fontMetrics(), &m_inlineTextBox, textDecorationThick
ness); |
| 719 paintAppliedDecoration(context, localOrigin + FloatPoint(0, underlineOff
set), width, doubleOffset, 1, underline, textDecorationThickness, antialiasDecor
ation, isPrinting); |
| 720 } |
| 721 if (deco & TextDecorationOverline) { |
| 722 paintAppliedDecoration(context, localOrigin, width, -doubleOffset, 1, ov
erline, textDecorationThickness, antialiasDecoration, isPrinting); |
| 723 } |
| 724 if (deco & TextDecorationLineThrough) { |
| 725 const float lineThroughOffset = 2 * baseline / 3; |
| 726 paintAppliedDecoration(context, localOrigin + FloatPoint(0, lineThroughO
ffset), width, doubleOffset, 0, linethrough, textDecorationThickness, antialiasD
ecoration, isPrinting); |
| 727 } |
| 728 } |
| 729 |
| 730 void InlineTextBoxPainter::paintCompositionUnderline(GraphicsContext* ctx, const
FloatPoint& boxOrigin, const CompositionUnderline& underline) |
| 731 { |
| 732 if (m_inlineTextBox.truncation() == cFullTruncation) |
| 733 return; |
| 734 |
| 735 unsigned paintStart = underlinePaintStart(underline); |
| 736 unsigned paintEnd = underlinePaintEnd(underline); |
| 737 |
| 738 // start of line to draw, relative to paintOffset. |
| 739 float start = paintStart == static_cast<unsigned>(m_inlineTextBox.start()) ?
0 : |
| 740 m_inlineTextBox.renderer().width(m_inlineTextBox.start(), paintStart - m
_inlineTextBox.start(), m_inlineTextBox.textPos(), m_inlineTextBox.isLeftToRight
Direction() ? LTR : RTL, m_inlineTextBox.isFirstLineStyle()); |
| 741 // how much line to draw |
| 742 float width = (paintStart == static_cast<unsigned>(m_inlineTextBox.start())
&& paintEnd == static_cast<unsigned>(m_inlineTextBox.end()) + 1) ? m_inlineTextB
ox.logicalWidth() : |
| 743 m_inlineTextBox.renderer().width(paintStart, paintEnd - paintStart, m_in
lineTextBox.textPos() + start, m_inlineTextBox.isLeftToRightDirection() ? LTR :
RTL, m_inlineTextBox.isFirstLineStyle()); |
| 744 |
| 745 // Thick marked text underlines are 2px thick as long as there is room for t
he 2px line under the baseline. |
| 746 // All other marked text underlines are 1px thick. |
| 747 // If there's not enough space the underline will touch or overlap character
s. |
| 748 int lineThickness = 1; |
| 749 int baseline = m_inlineTextBox.renderer().style(m_inlineTextBox.isFirstLineS
tyle())->fontMetrics().ascent(); |
| 750 if (underline.thick && m_inlineTextBox.logicalHeight() - baseline >= 2) |
| 751 lineThickness = 2; |
| 752 |
| 753 // We need to have some space between underlines of subsequent clauses, beca
use some input methods do not use different underline styles for those. |
| 754 // We make each line shorter, which has a harmless side effect of shortening
the first and last clauses, too. |
| 755 start += 1; |
| 756 width -= 2; |
| 757 |
| 758 ctx->setStrokeColor(underline.color); |
| 759 ctx->setStrokeThickness(lineThickness); |
| 760 ctx->drawLineForText(FloatPoint(boxOrigin.x() + start, boxOrigin.y() + m_inl
ineTextBox.logicalHeight() - lineThickness), width, m_inlineTextBox.renderer().d
ocument().printing()); |
| 761 } |
| 762 |
| 763 void InlineTextBoxPainter::paintTextMatchMarker(GraphicsContext* pt, const Float
Point& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font) |
| 764 { |
| 765 // Use same y positioning and height as for selection, so that when the sele
ction and this highlight are on |
| 766 // the same word there are no pieces sticking out. |
| 767 int deltaY = m_inlineTextBox.renderer().style()->isFlippedLinesWritingMode()
? m_inlineTextBox.root().selectionBottom() - m_inlineTextBox.logicalBottom() :
m_inlineTextBox.logicalTop() - m_inlineTextBox.root().selectionTop(); |
| 768 int selHeight = m_inlineTextBox.root().selectionHeight(); |
| 769 |
| 770 int sPos = std::max(marker->startOffset() - m_inlineTextBox.start(), (unsign
ed)0); |
| 771 int ePos = std::min(marker->endOffset() - m_inlineTextBox.start(), m_inlineT
extBox.len()); |
| 772 TextRun run = m_inlineTextBox.constructTextRun(style, font); |
| 773 |
| 774 // Always compute and store the rect associated with this marker. The comput
ed rect is in absolute coordinates. |
| 775 IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, IntPoin
t(m_inlineTextBox.x(), m_inlineTextBox.root().selectionTop()), selHeight, sPos,
ePos)); |
| 776 markerRect = m_inlineTextBox.renderer().localToAbsoluteQuad(FloatRect(marker
Rect)).enclosingBoundingBox(); |
| 777 toRenderedDocumentMarker(marker)->setRenderedRect(markerRect); |
| 778 |
| 779 // Optionally highlight the text |
| 780 if (m_inlineTextBox.renderer().frame()->editor().markedTextMatchesAreHighlig
hted()) { |
| 781 Color color = marker->activeMatch() ? |
| 782 RenderTheme::theme().platformActiveTextSearchHighlightColor() : |
| 783 RenderTheme::theme().platformInactiveTextSearchHighlightColor(); |
| 784 GraphicsContextStateSaver stateSaver(*pt); |
| 785 pt->clip(FloatRect(boxOrigin.x(), boxOrigin.y() - deltaY, m_inlineTextBo
x.logicalWidth(), selHeight)); |
| 786 pt->drawHighlightForText(font, run, FloatPoint(boxOrigin.x(), boxOrigin.
y() - deltaY), selHeight, color, sPos, ePos); |
| 787 } |
| 788 } |
| 789 |
| 790 |
| 791 } // namespace blink |
OLD | NEW |