Get border/padding from fragment when painting background. #46252
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Since @page border box layout objects aren't in the the layout tree, any code that wants to walk up the tree to find the containing block will be in for a surprise. This would happen if percentage-based @page padding was used [1]. Recomputing padding during painting when we have already done it during layout is rather pointless anyway. Read it out directly from the fragment. [1] #1 blink::LayoutBox::ContainingBlockLogicalWidthForContent() #2 blink::LayoutBoxModelObject::ComputedCSSPadding() #3 blink::LayoutBoxModelObject::PaddingTop() #4 blink::LayoutBoxModelObject::PaddingOutsets() #5 blink::BoxPainterBase::PaintFillLayer() #6 blink::BoxPainterBase::PaintFillLayers() #7 blink::BoxFragmentPainter::PaintBackground() Bug: 40286153 Change-Id: I1e6e92c2ce1d81aab2673ec9a877eac455534102 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5526469 Commit-Queue: Morten Stenshorne <[email protected]> Reviewed-by: Xianzhu Wang <[email protected]> Reviewed-by: Ian Kilpatrick <[email protected]> Cr-Commit-Position: refs/heads/main@{#1300711}
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Since @page border box layout objects aren't in the the layout tree, any
code that wants to walk up the tree to find the containing block will be
in for a surprise.
This would happen if percentage-based @page padding was used [1].
Recomputing padding during painting when we have already done it during
layout is rather pointless anyway. Read it out directly from the
fragment.
[1] #1 blink::LayoutBox::ContainingBlockLogicalWidthForContent()
#2 blink::LayoutBoxModelObject::ComputedCSSPadding()
#3 blink::LayoutBoxModelObject::PaddingTop()
#4 blink::LayoutBoxModelObject::PaddingOutsets()
#5 blink::BoxPainterBase::PaintFillLayer()
#6 blink::BoxPainterBase::PaintFillLayers()
#7 blink::BoxFragmentPainter::PaintBackground()
Bug: 40286153
Change-Id: I1e6e92c2ce1d81aab2673ec9a877eac455534102
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5526469
Commit-Queue: Morten Stenshorne <[email protected]>
Reviewed-by: Xianzhu Wang <[email protected]>
Reviewed-by: Ian Kilpatrick <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1300711}