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Issue #146 - Part 3: Create nsDisplayTableFixedPosition to avoid display

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list collisions when processing the background image of a table.
This commit is contained in:
wolfbeast 2019-11-03 15:12:34 +01:00 • committed by Roy Tam
commit c8aaad0428
3 changed files with 108 additions and 8 deletions
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63
layout/base/nsDisplayList.cpp
View file

@ -80,6 +80,8 @@
#include "nsPluginFrame.h"
#include "DisplayItemScrollClip.h"
#include "nsSVGMaskFrame.h"
#include "nsTableCellFrame.h"
#include "nsTableColFrame.h"
// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
// GetTickCount().
@ -2632,7 +2634,8 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
nsDisplayList* aList,
bool aAllowWillPaintBorderOptimization,
nsStyleContext* aStyleContext,
const nsRect& aBackgroundOriginRect)
const nsRect& aBackgroundOriginRect,
nsIFrame* aSecondaryReferenceFrame)
{
nsStyleContext* bgSC = aStyleContext;
const nsStyleBackground* bg = nullptr;
@ -2752,8 +2755,17 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bgOriginRect, bg);
if (bgItem->ShouldFixToViewport(aBuilder)) {
thisItemList.AppendNewToTop(
nsDisplayFixedPosition::CreateForFixedBackground(aBuilder, aFrame, bgItem, i));
if (aSecondaryReferenceFrame) {
thisItemList.AppendNewToTop(
nsDisplayTableFixedPosition::CreateForFixedBackground(aBuilder,
aSecondaryReferenceFrame,
bgItem,
i,
aFrame));
} else {
thisItemList.AppendNewToTop(
nsDisplayFixedPosition::CreateForFixedBackground(aBuilder, aFrame, bgItem, i));
}
} else {
thisItemList.AppendNewToTop(bgItem);
}
@ -5277,6 +5289,51 @@ bool nsDisplayFixedPosition::TryMerge(nsDisplayItem* aItem) {
return true;
}
TableType
GetTableTypeFromFrame(nsIFrame* aFrame)
{
nsIAtom* type = aFrame->GetType();
if (type == nsGkAtoms::tableFrame) {
return TableType::TABLE;
} else if (type == nsGkAtoms::tableColFrame) {
return TableType::TABLE_COL;
} else if (type == nsGkAtoms::tableColGroupFrame) {
return TableType::TABLE_COL_GROUP;
} else if (type == nsGkAtoms::tableRowFrame) {
return TableType::TABLE_ROW;
} else if (type == nsGkAtoms::tableRowGroupFrame) {
return TableType::TABLE_ROW_GROUP;
} else if (type == nsGkAtoms::tableCellFrame) {
return TableType::TABLE_CELL;
} else {
MOZ_ASSERT_UNREACHABLE("Invalid frame.");
return TableType::TABLE;
}
}
nsDisplayTableFixedPosition::nsDisplayTableFixedPosition(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList,
uint32_t aIndex,
nsIFrame* aAncestorFrame)
: nsDisplayFixedPosition(aBuilder, aFrame, aList, aIndex)
, mTableType(GetTableTypeFromFrame(aAncestorFrame))
{
}
/* static */ nsDisplayTableFixedPosition*
nsDisplayTableFixedPosition::CreateForFixedBackground(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayBackgroundImage* aImage,
uint32_t aIndex,
nsIFrame* aAncestorFrame)
{
nsDisplayList temp;
temp.AppendToTop(aImage);
return new (aBuilder) nsDisplayTableFixedPosition(aBuilder, aFrame, &temp, aIndex + 1, aAncestorFrame);
}
nsDisplayStickyPosition::nsDisplayStickyPosition(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)