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Bug 727125 - Lazily compute LineBaselineOffset when needed so it is present after a dynamic change of 'text-decoration'. r=dbaron
This fixes the positioning of underlines set on a block or its ancestor when drawn on children of a block that have a vertical-align != baseline. The lazy computation is done all at once for all children of a block to avoid O(N^2) searches for the line containing a frame.
This commit is contained in:
Susanna Bowen
parent
0decbd2563
commit
ab5183111a
@ -731,6 +731,16 @@ nsLineLayout::ReflowFrame(nsIFrame* aFrame,
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printf("\n");
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#endif
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if (mCurrentSpan == mRootSpan) {
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pfd->mFrame->Properties().Remove(nsIFrame::LineBaselineOffset());
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} else {
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#ifdef DEBUG
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bool hasLineOffset;
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pfd->mFrame->Properties().Get(nsIFrame::LineBaselineOffset(), &hasLineOffset);
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NS_ASSERTION(!hasLineOffset, "LineBaselineOffset was set but was not expected");
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#endif
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}
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mTextJustificationNumSpaces = 0;
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mTextJustificationNumLetters = 0;
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@ -1452,22 +1462,6 @@ nsLineLayout::BlockDirAlignLine()
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}
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PlaceStartEndFrames(psd, -mBStartEdge, lineBSize);
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// If the frame being reflowed has text decorations, we simulate the
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// propagation of those decorations to a line-level element by storing the
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// offset in a frame property on any child frames that are aligned in the
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// block direction somewhere other than the baseline. This property is then
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// used by nsTextFrame::GetTextDecorations when the same conditions are met.
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if (rootPFD.mFrame->StyleContext()->HasTextDecorationLines()) {
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for (const PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
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const nsIFrame *const f = pfd->mFrame;
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if (f->VerticalAlignEnum() != NS_STYLE_VERTICAL_ALIGN_BASELINE) {
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const nscoord offset = baselineBCoord - pfd->mBounds.BStart(lineWM);
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f->Properties().Set(nsIFrame::LineBaselineOffset(),
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NS_INT32_TO_PTR(offset));
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}
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}
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}
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// Fill in returned line-box and max-element-width data
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mLineBox->SetBounds(lineWM,
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psd->mIStart, mBStartEdge,
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@ -4620,6 +4620,40 @@ PaintSelectionBackground(gfxContext* aCtx, nsPresContext* aPresContext,
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}
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}
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// Attempt to get the LineBaselineOffset property of aChildFrame
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// If not set, calculate this value for all child frames of aBlockFrame
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static nscoord
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LazyGetLineBaselineOffset(nsIFrame* aChildFrame, nsBlockFrame* aBlockFrame)
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{
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bool offsetFound;
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nscoord offset = NS_PTR_TO_INT32(
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aChildFrame->Properties().Get(nsIFrame::LineBaselineOffset(), &offsetFound)
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);
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if (!offsetFound) {
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for (nsBlockFrame::line_iterator line = aBlockFrame->begin_lines(),
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line_end = aBlockFrame->end_lines();
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line != line_end; line++) {
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if (line->IsInline()) {
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int32_t n = line->GetChildCount();
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nscoord lineBaseline = line->BStart() + line->GetAscent();
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for (nsIFrame* lineFrame = line->mFirstChild;
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n > 0; lineFrame = lineFrame->GetNextSibling(), --n) {
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offset = lineBaseline - lineFrame->GetNormalPosition().y;
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lineFrame->Properties().Set(nsIFrame::LineBaselineOffset(),
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NS_INT32_TO_PTR(offset));
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}
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}
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}
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return NS_PTR_TO_INT32(
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aChildFrame->Properties().Get(nsIFrame::LineBaselineOffset(), &offsetFound)
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);
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} else {
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return offset;
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}
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}
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void
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nsTextFrame::GetTextDecorations(
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nsPresContext* aPresContext,
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@ -4663,7 +4697,8 @@ nsTextFrame::GetTextDecorations(
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nsLayoutUtils::GetColor(f, eCSSProperty_text_decoration_color);
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}
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const bool firstBlock = !nearestBlockFound && nsLayoutUtils::GetAsBlock(f);
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nsBlockFrame* fBlock = nsLayoutUtils::GetAsBlock(f);
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const bool firstBlock = !nearestBlockFound && fBlock;
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// Not updating positions once we hit a parent block is equivalent to
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// the CSS 2.1 spec that blocks should propagate decorations down to their
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@ -4674,13 +4709,15 @@ nsTextFrame::GetTextDecorations(
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if (firstBlock) {
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// At this point, fChild can't be null since TextFrames can't be blocks
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if (fChild->VerticalAlignEnum() != NS_STYLE_VERTICAL_ALIGN_BASELINE) {
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// Since offset is the offset in the child's coordinate space, we have
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// to undo the accumulation to bring the transform out of the block's
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// coordinate space
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const nscoord lineBaselineOffset = LazyGetLineBaselineOffset(fChild,
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fBlock);
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baselineOffset =
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frameTopOffset - fChild->GetNormalPosition().y
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- NS_PTR_TO_INT32(
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fChild->Properties().Get(nsIFrame::LineBaselineOffset()));
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frameTopOffset - fChild->GetNormalPosition().y - lineBaselineOffset;
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}
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}
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else if (!nearestBlockFound) {
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@ -0,0 +1,21 @@
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<html>
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<head>
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<style>
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.underline {
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text-decoration: underline;
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}
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p class="underline">
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<span class="align-bottom">This</span> line has a bottom vertical align span. <br />
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<span class="align-top">This</span> line has a top vertical align span.
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</p>
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</body>
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</html>
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@ -0,0 +1,26 @@
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<html class="reftest-wait">
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<head>
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<script type="text/javascript">
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function addUnderline() {
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var element = document.getElementById("dynamicUnderline");
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element.style.textDecoration = "underline";
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document.documentElement.removeAttribute("class");
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}
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document.addEventListener('MozReftestInvalidate', addUnderline, false);
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</script>
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<style>
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p id="dynamicUnderline">
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<span class="align-bottom">This</span> line has a bottom vertical align span. <br />
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<span class="align-top">This</span> line has a top vertical align span.
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</p>
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</body>
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</html>
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@ -0,0 +1,21 @@
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<html>
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<head>
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<style>
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.underline {
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text-decoration: underline;
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}
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p class="underline">
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<span class="align-bottom">This line has only a bottom vertical align span.</span> <br />
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<span class="align-top">This line has a top vertical align span.</span>
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</p>
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</body>
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</html>
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@ -0,0 +1,26 @@
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<html class="reftest-wait">
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<head>
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<script type="text/javascript">
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function addUnderline() {
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var element = document.getElementById("dynamicUnderline");
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element.style.textDecoration = "underline";
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document.documentElement.removeAttribute("class");
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}
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document.addEventListener('MozReftestInvalidate', addUnderline, false);
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</script>
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<style>
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p id="dynamicUnderline">
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<span class="align-bottom">This line has only a bottom vertical align span.</span> <br />
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<span class="align-top">This line has a top vertical align span.</span>
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</p>
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</body>
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</html>
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@ -0,0 +1,22 @@
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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.underline {
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text-decoration: underline;
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}
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p class="underline">
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<span class="align-bottom">This</span> line has a bottom vertical align span. <br />
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<span class="align-top">This</span> line has a top vertical align span.
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</p>
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</body>
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</html>
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@ -0,0 +1,27 @@
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<!DOCTYPE html>
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<html class="reftest-wait">
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<head>
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<script type="text/javascript">
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function addUnderline() {
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var element = document.getElementById("dynamicUnderline");
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element.style.textDecoration = "underline";
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document.documentElement.removeAttribute("class");
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}
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document.addEventListener('MozReftestInvalidate', addUnderline, false);
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</script>
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<style>
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p id="dynamicUnderline">
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<span class="align-bottom">This</span> line has a bottom vertical align span. <br />
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<span class="align-top">This</span> line has a top vertical align span.
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</p>
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</body>
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</html>
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@ -0,0 +1,22 @@
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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.underline {
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text-decoration: underline;
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}
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p class="underline">
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<span class="align-bottom">This line has only a bottom vertical align span.</span> <br />
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<span class="align-top">This line has a top vertical align span.</span>
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</p>
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</body>
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</html>
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@ -0,0 +1,27 @@
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<!DOCTYPE html>
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<html class="reftest-wait">
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<head>
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<script type="text/javascript">
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function addUnderline() {
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var element = document.getElementById("dynamicUnderline");
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element.style.textDecoration = "underline";
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document.documentElement.removeAttribute("class");
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}
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document.addEventListener('MozReftestInvalidate', addUnderline, false);
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</script>
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<style>
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.align-bottom {
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vertical-align: bottom;
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}
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.align-top {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<p id="dynamicUnderline">
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<span class="align-bottom">This line has only a bottom vertical align span.</span> <br />
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<span class="align-top">This line has a top vertical align span.</span>
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</p>
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</body>
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</html>
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@ -4,6 +4,10 @@ skip-if(B2G) == complex-decoration-style-standards.html complex-decoration-style
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== decoration-color-standards.html decoration-color-standards-ref.html
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== decoration-style-quirks.html decoration-style-quirks-ref.html
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== decoration-style-standards.html decoration-style-standards-ref.html
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== dynamic-underline-vertical-align-quirks-1.html dynamic-underline-vertical-align-quirks-1-ref.html
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== dynamic-underline-vertical-align-standards-1.html dynamic-underline-vertical-align-standards-1-ref.html
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fails == dynamic-underline-vertical-align-quirks-2.html dynamic-underline-vertical-align-quirks-2-ref.html # Bug 750917
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== dynamic-underline-vertical-align-standards-2.html dynamic-underline-vertical-align-standards-2-ref.html
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== line-through-style-block-solid-quirks.html line-through-style-block-quirks-ref.html
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!= line-through-style-block-dotted-quirks.html line-through-style-block-quirks-ref.html
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!= line-through-style-block-dashed-quirks.html line-through-style-block-quirks-ref.html
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