static AvoidanceReasonFlags canUseForFontAndText(const RenderBlockFlow& flow, FallThrough fallthrough)
{
AvoidanceReasonFlags reasons = NoReason;
// We assume that all lines have metrics based purely on the primary font.
const auto& style = flow.style();
auto& primaryFont = style.fontCascade().primaryFont();
if (primaryFont.isLoading())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowIsMissingPrimaryFont, fallthrough);
if (primaryFont.isSVGFont())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowHasSVGFont, fallthrough);
for (const auto& textRenderer : childrenOfType<RenderText>(flow)) {
if (textRenderer.isCombineText())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowTextIsCombineText, fallthrough);
if (textRenderer.isCounter())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowTextIsRenderCounter, fallthrough);
if (textRenderer.isQuote())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowTextIsRenderQuote, fallthrough);
if (textRenderer.isTextFragment())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowTextIsTextFragment, fallthrough);
if (textRenderer.isSVGInlineText())
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowTextIsSVGInlineText, fallthrough);
if (style.fontCascade().codePath(TextRun(textRenderer.text())) != FontCascade::Simple)
SET_REASON_AND_RETURN_IF_NEEDED(reasons, FlowFontIsNotSimple, fallthrough);
auto textReasons = canUseForText(textRenderer, primaryFont, fallthrough);
if (textReasons != NoReason)
SET_REASON_AND_RETURN_IF_NEEDED(reasons, textReasons, fallthrough);
}
return reasons;
}
bool canUseFor(const RenderBlockFlow& flow)
{
if (!flow.frame().settings().simpleLineLayoutEnabled())
return false;
if (!flow.firstChild())
return false;
// This currently covers <blockflow>#text</blockflow> case.
// The <blockflow><inline>#text</inline></blockflow> case is also popular and should be relatively easy to cover.
if (flow.firstChild() != flow.lastChild())
return false;
if (!flow.firstChild()->isText())
return false;
if (!flow.isHorizontalWritingMode())
return false;
if (flow.flowThreadState() != RenderObject::NotInsideFlowThread)
return false;
if (flow.hasOutline())
return false;
if (flow.isRubyText() || flow.isRubyBase())
return false;
if (flow.parent()->isDeprecatedFlexibleBox())
return false;
// FIXME: Implementation of wrap=hard looks into lineboxes.
if (flow.parent()->isTextArea() && flow.parent()->element()->fastHasAttribute(HTMLNames::wrapAttr))
return false;
// FIXME: Placeholders do something strange.
if (flow.parent()->isTextControl() && toRenderTextControl(*flow.parent()).textFormControlElement().placeholderElement())
return false;
const RenderStyle& style = flow.style();
if (style.textDecorationsInEffect() != TextDecorationNone)
return false;
if (style.textAlign() == JUSTIFY)
return false;
// Non-visible overflow should be pretty easy to support.
if (style.overflowX() != OVISIBLE || style.overflowY() != OVISIBLE)
return false;
if (!style.textIndent().isZero())
return false;
if (!style.wordSpacing().isZero() || style.letterSpacing())
return false;
if (style.textTransform() != TTNONE)
return false;
if (!style.isLeftToRightDirection())
return false;
if (style.lineBoxContain() != RenderStyle::initialLineBoxContain())
return false;
if (style.writingMode() != TopToBottomWritingMode)
return false;
if (style.lineBreak() != LineBreakAuto)
return false;
if (style.wordBreak() != NormalWordBreak)
return false;
if (style.unicodeBidi() != UBNormal || style.rtlOrdering() != LogicalOrder)
return false;
if (style.lineAlign() != LineAlignNone || style.lineSnap() != LineSnapNone)
return false;
if (style.hyphens() == HyphensAuto)
return false;
if (style.textEmphasisFill() != TextEmphasisFillFilled || style.textEmphasisMark() != TextEmphasisMarkNone)
return false;
if (style.textShadow())
return false;
if (style.textOverflow() || (flow.isAnonymousBlock() && flow.parent()->style().textOverflow()))
return false;
if (style.hasPseudoStyle(FIRST_LINE) || style.hasPseudoStyle(FIRST_LETTER))
return false;
if (style.hasTextCombine())
return false;
if (style.backgroundClip() == TextFillBox)
return false;
if (style.borderFit() == BorderFitLines)
return false;
const RenderText& textRenderer = toRenderText(*flow.firstChild());
if (flow.containsFloats()) {
// We can't use the code path if any lines would need to be shifted below floats. This is because we don't keep per-line y coordinates.
float minimumWidthNeeded = textRenderer.minLogicalWidth();
for (auto& floatRenderer : *flow.floatingObjectSet()) {
ASSERT(floatRenderer);
float availableWidth = flow.availableLogicalWidthForLine(floatRenderer->y(), false);
if (availableWidth < minimumWidthNeeded)
return false;
}
}
if (textRenderer.isCombineText() || textRenderer.isCounter() || textRenderer.isQuote() || textRenderer.isTextFragment()
|| textRenderer.isSVGInlineText())
return false;
if (style.font().codePath(TextRun(textRenderer.text())) != Font::Simple)
return false;
if (style.font().isSVGFont())
return false;
// We assume that all lines have metrics based purely on the primary font.
auto& primaryFontData = *style.font().primaryFont();
if (primaryFontData.isLoading())
return false;
if (!canUseForText(textRenderer, primaryFontData))
return false;
return true;
}
static bool canUseForText(const RenderText& textRenderer, const SimpleFontData& fontData)
{
if (textRenderer.is8Bit())
return canUseForText(textRenderer.characters8(), textRenderer.textLength(), fontData);
return canUseForText(textRenderer.characters16(), textRenderer.textLength(), fontData);
}
static AvoidanceReasonFlags canUseForText(const RenderText& textRenderer, const Font& font, FallThrough fallthrough)
{
if (textRenderer.is8Bit())
return canUseForText(textRenderer.characters8(), textRenderer.textLength(), font, fallthrough);
return canUseForText(textRenderer.characters16(), textRenderer.textLength(), font, fallthrough);
}
bool canUseFor(const RenderBlockFlow& flow)
{
#if !PLATFORM(MAC) && !PLATFORM(GTK) && !PLATFORM(EFL)
// FIXME: Non-mac platforms are hitting ASSERT(run.charactersLength() >= run.length())
// https://bugs.webkit.org/show_bug.cgi?id=123338
return false;
#else
if (!flow.frame().settings().simpleLineLayoutEnabled())
return false;
if (!flow.firstChild())
return false;
// This currently covers <blockflow>#text</blockflow> case.
// The <blockflow><inline>#text</inline></blockflow> case is also popular and should be relatively easy to cover.
if (flow.firstChild() != flow.lastChild())
return false;
if (!flow.firstChild()->isText())
return false;
if (!flow.isHorizontalWritingMode())
return false;
if (flow.flowThreadState() != RenderObject::NotInsideFlowThread)
return false;
if (flow.hasOutline())
return false;
if (flow.isRubyText() || flow.isRubyBase())
return false;
if (flow.parent()->isDeprecatedFlexibleBox())
return false;
// FIXME: Implementation of wrap=hard looks into lineboxes.
if (flow.parent()->isTextArea() && flow.parent()->element()->fastHasAttribute(HTMLNames::wrapAttr))
return false;
// FIXME: Placeholders do something strange.
if (flow.parent()->isTextControl() && toRenderTextControl(*flow.parent()).textFormControlElement().placeholderElement())
return false;
// These tests only works during layout. Outside layout this function may give false positives.
if (flow.view().layoutState()) {
#if ENABLE(CSS_SHAPES)
if (flow.view().layoutState()->shapeInsideInfo())
return false;
#endif
if (flow.view().layoutState()->m_columnInfo)
return false;
}
const RenderStyle& style = flow.style();
if (style.textDecorationsInEffect() != TextDecorationNone)
return false;
if (style.textAlign() == JUSTIFY)
return false;
// Non-visible overflow should be pretty easy to support.
if (style.overflowX() != OVISIBLE || style.overflowY() != OVISIBLE)
return false;
if (!style.textIndent().isZero())
return false;
if (style.wordSpacing() || style.letterSpacing())
return false;
if (style.textTransform() != TTNONE)
return false;
if (!style.isLeftToRightDirection())
return false;
if (style.lineBoxContain() != RenderStyle::initialLineBoxContain())
return false;
if (style.writingMode() != TopToBottomWritingMode)
return false;
if (style.lineBreak() != LineBreakAuto)
return false;
if (style.wordBreak() != NormalWordBreak)
return false;
if (style.unicodeBidi() != UBNormal || style.rtlOrdering() != LogicalOrder)
return false;
if (style.lineAlign() != LineAlignNone || style.lineSnap() != LineSnapNone)
return false;
if (style.hyphens() == HyphensAuto)
return false;
if (style.textEmphasisFill() != TextEmphasisFillFilled || style.textEmphasisMark() != TextEmphasisMarkNone)
return false;
if (style.textShadow())
return false;
#if ENABLE(CSS_SHAPES)
if (style.resolvedShapeInside())
return true;
#endif
if (style.textOverflow() || (flow.isAnonymousBlock() && flow.parent()->style().textOverflow()))
return false;
if (style.hasPseudoStyle(FIRST_LINE) || style.hasPseudoStyle(FIRST_LETTER))
return false;
if (style.hasTextCombine())
return false;
if (style.backgroundClip() == TextFillBox)
return false;
if (style.borderFit() == BorderFitLines)
return false;
const RenderText& textRenderer = toRenderText(*flow.firstChild());
if (flow.containsFloats()) {
// We can't use the code path if any lines would need to be shifted below floats. This is because we don't keep per-line y coordinates.
// It is enough to test the first line width only as currently all floats must be overhanging.
if (textRenderer.minLogicalWidth() > LineWidth(const_cast<RenderBlockFlow&>(flow), false, DoNotIndentText).availableWidth())
return false;
}
if (textRenderer.isCombineText() || textRenderer.isCounter() || textRenderer.isQuote() || textRenderer.isTextFragment()
#if ENABLE(SVG)
|| textRenderer.isSVGInlineText()
#endif
)
return false;
if (style.font().codePath(TextRun(textRenderer.text())) != Font::Simple)
return false;
if (style.font().isSVGFont())
return false;
// We assume that all lines have metrics based purely on the primary font.
auto& primaryFontData = *style.font().primaryFont();
if (primaryFontData.isLoading())
return false;
if (!canUseForText(textRenderer, primaryFontData))
return false;
return true;
#endif
}
