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Diffstat (limited to 'layout/tables/nsTablePainter.cpp')
| -rw-r--r-- | layout/tables/nsTablePainter.cpp | 696 |
1 files changed, 0 insertions, 696 deletions
diff --git a/layout/tables/nsTablePainter.cpp b/layout/tables/nsTablePainter.cpp deleted file mode 100644 index bfe2a7d42..000000000 --- a/layout/tables/nsTablePainter.cpp +++ /dev/null @@ -1,696 +0,0 @@ -/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ -/* This Source Code Form is subject to the terms of the Mozilla Public - * License, v. 2.0. If a copy of the MPL was not distributed with this - * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ - -#include "nsTableFrame.h" -#include "nsTableRowGroupFrame.h" -#include "nsTableRowFrame.h" -#include "nsTableColGroupFrame.h" -#include "nsTableColFrame.h" -#include "nsTableCellFrame.h" -#include "nsTablePainter.h" -#include "nsCSSRendering.h" -#include "nsDisplayList.h" -#include "mozilla/WritingModes.h" - -/* ~*~ Table Background Painting ~*~ - - Mozilla's Table Background painting follows CSS2.1:17.5.1 - That section does not, however, describe the effect of - borders on background image positioning. What we do is: - - - in separate borders, the borders are passed in so that - their width figures in image positioning, even for rows/cols, which - don't have visible borders. This is done to allow authors - to position row backgrounds by, for example, aligning the - top left corner with the top left padding corner of the - top left table cell in the row in cases where all cells - have consistent border widths. If we didn't honor these - invisible borders, there would be no way to align - backgrounds with the padding edges, and designs would be - lost underneath the border. - - - in collapsing borders, because the borders collapse, we - use the -continuous border- width to synthesize a border - style and pass that in instead of using the element's - assigned style directly. - - The continuous border on a given edge of an element is - the collapse of all borders guaranteed to be continuous - along that edge. Cell borders are ignored (because, for - example, setting a thick border on the leftmost cell - should not shift the row background over; this way a - striped background set on <tr> will line up across rows - even if the cells are assigned arbitrary border widths. - - For example, the continuous border on the top edge of a - row group is the collapse of any row group, row, and - table borders involved. (The first row group's top would - be [table-top + row group top + first row top]. It's bottom - would be [row group bottom + last row bottom + next row - top + next row group top].) - The top edge of a column group likewise includes the - table top, row group top, and first row top borders. However, - it *also* includes its own top border, since that is guaranteed - to be continuous. It does not include column borders because - those are not guaranteed to be continuous: there may be two - columns with different borders in a single column group. - - An alternative would be to define the continuous border as - [table? + row group + row] for horizontal - [table? + col group + col] for vertical - This makes it easier to line up backgrounds across elements - despite varying border widths, but it does not give much - flexibility in aligning /to/ those border widths. -*/ - - -/* ~*~ TableBackgroundPainter ~*~ - - The TableBackgroundPainter is created and destroyed in one painting call. - Its principal function is PaintTable, which paints all table element - backgrounds. The initial code in that method sets up an array of column - data that caches the background styles and the border sizes for the - columns and colgroups in TableBackgroundData structs in mCols. Data for - BC borders are calculated and stashed in a synthesized border style struct - in the data struct since collapsed borders aren't the same width as style- - assigned borders. The data struct optimizes by only doing this if there's - an image background; otherwise we don't care. //XXX should also check background-origin - The class then loops through the row groups, rows, and cells. At the cell - level, it paints the backgrounds, one over the other, inside the cell rect. - - The exception to this pattern is when a table element creates a (pseudo) - stacking context. Elements with stacking contexts (e.g., 'opacity' applied) - are <dfn>passed through</dfn>, which means their data (and their - descendants' data) are not cached. The full loop is still executed, however, - so that underlying layers can get painted at the cell level. - - The TableBackgroundPainter is then destroyed. - - Elements with stacking contexts set up their own painter to finish the - painting process, since they were skipped. They call the appropriate - sub-part of the loop (e.g. PaintRow) which will paint the frame and - descendants. - - XXX views are going - */ - -using namespace mozilla; -using namespace mozilla::image; - -TableBackgroundPainter::TableBackgroundData::TableBackgroundData() - : mFrame(nullptr) - , mVisible(false) - , mUsesSynthBorder(false) -{ -} - -TableBackgroundPainter::TableBackgroundData::TableBackgroundData(nsIFrame* aFrame) - : mFrame(aFrame) - , mRect(aFrame->GetRect()) - , mVisible(mFrame->IsVisibleForPainting()) - , mUsesSynthBorder(false) -{ -} - -inline bool -TableBackgroundPainter::TableBackgroundData::ShouldSetBCBorder() const -{ - /* we only need accurate border data when positioning background images*/ - if (!mVisible) { - return false; - } - - const nsStyleImageLayers& layers = mFrame->StyleBackground()->mImage; - NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, layers) { - if (!layers.mLayers[i].mImage.IsEmpty()) - return true; - } - return false; -} - -void -TableBackgroundPainter::TableBackgroundData::SetBCBorder(const nsMargin& aBorder) -{ - mUsesSynthBorder = true; - mSynthBorderWidths = aBorder; -} - -nsStyleBorder -TableBackgroundPainter::TableBackgroundData::StyleBorder(const nsStyleBorder& aZeroBorder) const -{ - MOZ_ASSERT(mVisible, "Don't call StyleBorder on an invisible TableBackgroundData"); - - if (mUsesSynthBorder) { - nsStyleBorder result = aZeroBorder; - NS_FOR_CSS_SIDES(side) { - result.SetBorderWidth(side, mSynthBorderWidths.Side(side)); - } - return result; - } - - MOZ_ASSERT(mFrame); - - return *mFrame->StyleBorder(); -} - -TableBackgroundPainter::TableBackgroundPainter(nsTableFrame* aTableFrame, - Origin aOrigin, - nsPresContext* aPresContext, - nsRenderingContext& aRenderingContext, - const nsRect& aDirtyRect, - const nsPoint& aRenderPt, - uint32_t aBGPaintFlags) - : mPresContext(aPresContext), - mRenderingContext(aRenderingContext), - mRenderPt(aRenderPt), - mDirtyRect(aDirtyRect), - mOrigin(aOrigin), - mZeroBorder(aPresContext), - mBGPaintFlags(aBGPaintFlags) -{ - MOZ_COUNT_CTOR(TableBackgroundPainter); - - NS_FOR_CSS_SIDES(side) { - mZeroBorder.SetBorderStyle(side, NS_STYLE_BORDER_STYLE_SOLID); - mZeroBorder.SetBorderWidth(side, 0); - } - - mIsBorderCollapse = aTableFrame->IsBorderCollapse(); -#ifdef DEBUG - mCompatMode = mPresContext->CompatibilityMode(); -#endif - mNumCols = aTableFrame->GetColCount(); -} - -TableBackgroundPainter::~TableBackgroundPainter() -{ - MOZ_COUNT_DTOR(TableBackgroundPainter); -} - -DrawResult -TableBackgroundPainter::PaintTableFrame(nsTableFrame* aTableFrame, - nsTableRowGroupFrame* aFirstRowGroup, - nsTableRowGroupFrame* aLastRowGroup, - const nsMargin& aDeflate) -{ - MOZ_ASSERT(aTableFrame, "null frame"); - TableBackgroundData tableData(aTableFrame); - tableData.mRect.MoveTo(0,0); //using table's coords - tableData.mRect.Deflate(aDeflate); - WritingMode wm = aTableFrame->GetWritingMode(); - if (mIsBorderCollapse && tableData.ShouldSetBCBorder()) { - if (aFirstRowGroup && aLastRowGroup && mNumCols > 0) { - //only handle non-degenerate tables; we need a more robust BC model - //to make degenerate tables' borders reasonable to deal with - LogicalMargin border(wm); - LogicalMargin tempBorder(wm); - nsTableColFrame* colFrame = aTableFrame->GetColFrame(mNumCols - 1); - if (colFrame) { - colFrame->GetContinuousBCBorderWidth(wm, tempBorder); - } - border.IEnd(wm) = tempBorder.IEnd(wm); - - aLastRowGroup->GetContinuousBCBorderWidth(wm, tempBorder); - border.BEnd(wm) = tempBorder.BEnd(wm); - - nsTableRowFrame* rowFrame = aFirstRowGroup->GetFirstRow(); - if (rowFrame) { - rowFrame->GetContinuousBCBorderWidth(wm, tempBorder); - border.BStart(wm) = tempBorder.BStart(wm); - } - - border.IStart(wm) = aTableFrame->GetContinuousIStartBCBorderWidth(); - - tableData.SetBCBorder(border.GetPhysicalMargin(wm)); - } - } - - DrawResult result = DrawResult::SUCCESS; - - if (tableData.IsVisible()) { - nsCSSRendering::PaintBGParams params = - nsCSSRendering::PaintBGParams::ForAllLayers(*mPresContext, - mRenderingContext, - mDirtyRect, - tableData.mRect + mRenderPt, - tableData.mFrame, - mBGPaintFlags); - - result &= - nsCSSRendering::PaintBackgroundWithSC(params, - tableData.mFrame->StyleContext(), - tableData.StyleBorder(mZeroBorder)); - } - - return result; -} - -void -TableBackgroundPainter::TranslateContext(nscoord aDX, - nscoord aDY) -{ - mRenderPt += nsPoint(aDX, aDY); - for (auto& col : mCols) { - col.mCol.mRect.MoveBy(-aDX, -aDY); - } - for (auto& colGroup : mColGroups) { - colGroup.mRect.MoveBy(-aDX, -aDY); - } -} - -TableBackgroundPainter::ColData::ColData(nsIFrame* aFrame, TableBackgroundData& aColGroupBGData) - : mCol(aFrame) - , mColGroup(aColGroupBGData) -{ -} - -DrawResult -TableBackgroundPainter::PaintTable(nsTableFrame* aTableFrame, - const nsMargin& aDeflate, - bool aPaintTableBackground) -{ - NS_PRECONDITION(aTableFrame, "null table frame"); - - nsTableFrame::RowGroupArray rowGroups; - aTableFrame->OrderRowGroups(rowGroups); - WritingMode wm = aTableFrame->GetWritingMode(); - - DrawResult result = DrawResult::SUCCESS; - - if (rowGroups.Length() < 1) { //degenerate case - if (aPaintTableBackground) { - result &= PaintTableFrame(aTableFrame, nullptr, nullptr, nsMargin(0,0,0,0)); - } - /* No cells; nothing else to paint */ - return result; - } - - if (aPaintTableBackground) { - result &= - PaintTableFrame(aTableFrame, rowGroups[0], rowGroups[rowGroups.Length() - 1], - aDeflate); - } - - /*Set up column background/border data*/ - if (mNumCols > 0) { - nsFrameList& colGroupList = aTableFrame->GetColGroups(); - NS_ASSERTION(colGroupList.FirstChild(), "table should have at least one colgroup"); - - // Collect all col group frames first so that we know how many there are. - nsTArray<nsTableColGroupFrame*> colGroupFrames; - for (nsTableColGroupFrame* cgFrame = static_cast<nsTableColGroupFrame*>(colGroupList.FirstChild()); - cgFrame; cgFrame = static_cast<nsTableColGroupFrame*>(cgFrame->GetNextSibling())) { - - if (cgFrame->GetColCount() < 1) { - //No columns, no cells, so no need for data - continue; - } - colGroupFrames.AppendElement(cgFrame); - } - - // Ensure that mColGroups won't reallocate during the loop below, because - // we grab references to its contents and need those to stay valid until - // mColGroups is destroyed as part of TablePainter destruction. - mColGroups.SetCapacity(colGroupFrames.Length()); - - LogicalMargin border(wm); - /* BC iStart borders aren't stored on cols, but the previous column's - iEnd border is the next one's iStart border.*/ - //Start with table's iStart border. - nscoord lastIStartBorder = aTableFrame->GetContinuousIStartBCBorderWidth(); - - for (nsTableColGroupFrame* cgFrame : colGroupFrames) { - /*Create data struct for column group*/ - TableBackgroundData& cgData = *mColGroups.AppendElement(TableBackgroundData(cgFrame)); - if (mIsBorderCollapse && cgData.ShouldSetBCBorder()) { - border.IStart(wm) = lastIStartBorder; - cgFrame->GetContinuousBCBorderWidth(wm, border); - cgData.SetBCBorder(border.GetPhysicalMargin(wm)); - } - - /*Loop over columns in this colgroup*/ - for (nsTableColFrame* col = cgFrame->GetFirstColumn(); col; - col = static_cast<nsTableColFrame*>(col->GetNextSibling())) { - MOZ_ASSERT(size_t(col->GetColIndex()) == mCols.Length()); - // Store a reference to the colGroup in the ColData element. - ColData& colData = *mCols.AppendElement(ColData(col, cgData)); - //Bring column mRect into table's coord system - colData.mCol.mRect.MoveBy(cgData.mRect.x, cgData.mRect.y); - if (mIsBorderCollapse) { - border.IStart(wm) = lastIStartBorder; - lastIStartBorder = col->GetContinuousBCBorderWidth(wm, border); - if (colData.mCol.ShouldSetBCBorder()) { - colData.mCol.SetBCBorder(border.GetPhysicalMargin(wm)); - } - } - } - } - } - - for (uint32_t i = 0; i < rowGroups.Length(); i++) { - nsTableRowGroupFrame* rg = rowGroups[i]; - TableBackgroundData rowGroupBGData(rg); - // Need to compute the right rect via GetOffsetTo, since the row - // group may not be a child of the table. - rowGroupBGData.mRect.MoveTo(rg->GetOffsetTo(aTableFrame)); - - // We have to draw backgrounds not only within the overflow region of this - // row group, but also possibly (in the case of column / column group - // backgrounds) at its pre-relative-positioning location. - nsRect rgVisualOverflow = rg->GetVisualOverflowRectRelativeToSelf(); - nsRect rgOverflowRect = rgVisualOverflow + rg->GetPosition(); - nsRect rgNormalRect = rgVisualOverflow + rg->GetNormalPosition(); - - if (rgOverflowRect.Union(rgNormalRect).Intersects(mDirtyRect - mRenderPt)) { - result &= - PaintRowGroup(rg, rowGroupBGData, rg->IsPseudoStackingContextFromStyle()); - } - } - - return result; -} - -DrawResult -TableBackgroundPainter::PaintRowGroup(nsTableRowGroupFrame* aFrame) -{ - return PaintRowGroup(aFrame, TableBackgroundData(aFrame), false); -} - -DrawResult -TableBackgroundPainter::PaintRowGroup(nsTableRowGroupFrame* aFrame, - TableBackgroundData aRowGroupBGData, - bool aPassThrough) -{ - MOZ_ASSERT(aFrame, "null frame"); - - nsTableRowFrame* firstRow = aFrame->GetFirstRow(); - WritingMode wm = aFrame->GetWritingMode(); - - /* Load row group data */ - if (aPassThrough) { - aRowGroupBGData.MakeInvisible(); - } else { - if (mIsBorderCollapse && aRowGroupBGData.ShouldSetBCBorder()) { - LogicalMargin border(wm); - if (firstRow) { - //pick up first row's bstart border (= rg bstart border) - firstRow->GetContinuousBCBorderWidth(wm, border); - /* (row group doesn't store its bstart border) */ - } - //overwrite sides+bottom borders with rg's own - aFrame->GetContinuousBCBorderWidth(wm, border); - aRowGroupBGData.SetBCBorder(border.GetPhysicalMargin(wm)); - } - aPassThrough = !aRowGroupBGData.IsVisible(); - } - - /* translate everything into row group coord system*/ - if (eOrigin_TableRowGroup != mOrigin) { - TranslateContext(aRowGroupBGData.mRect.x, aRowGroupBGData.mRect.y); - } - nsRect rgRect = aRowGroupBGData.mRect; - aRowGroupBGData.mRect.MoveTo(0, 0); - - /* Find the right row to start with */ - - // Note that mDirtyRect - mRenderPt is guaranteed to be in the row - // group's coordinate system here, so passing its .y to - // GetFirstRowContaining is ok. - nscoord overflowAbove; - nsIFrame* cursor = aFrame->GetFirstRowContaining(mDirtyRect.y - mRenderPt.y, &overflowAbove); - - // Sadly, it seems like there may be non-row frames in there... or something? - // There are certainly null-checks in GetFirstRow() and GetNextRow(). :( - while (cursor && cursor->GetType() != nsGkAtoms::tableRowFrame) { - cursor = cursor->GetNextSibling(); - } - - // It's OK if cursor is null here. - nsTableRowFrame* row = static_cast<nsTableRowFrame*>(cursor); - if (!row) { - // No useful cursor; just start at the top. Don't bother to set up a - // cursor; if we've gotten this far then we've already built the display - // list for the rowgroup, so not having a cursor means that there's some - // good reason we don't have a cursor and we shouldn't create one here. - row = firstRow; - } - - DrawResult result = DrawResult::SUCCESS; - - /* Finally paint */ - for (; row; row = row->GetNextRow()) { - TableBackgroundData rowBackgroundData(row); - - // Be sure to consider our positions both pre- and post-relative - // positioning, since we potentially need to paint at both places. - nscoord rowY = std::min(rowBackgroundData.mRect.y, row->GetNormalPosition().y); - - // Intersect wouldn't handle rowspans. - if (cursor && - (mDirtyRect.YMost() - mRenderPt.y) <= (rowY - overflowAbove)) { - // All done; cells originating in later rows can't intersect mDirtyRect. - break; - } - - result &= - PaintRow(row, aRowGroupBGData, rowBackgroundData, - aPassThrough || row->IsPseudoStackingContextFromStyle()); - } - - /* translate back into table coord system */ - if (eOrigin_TableRowGroup != mOrigin) { - TranslateContext(-rgRect.x, -rgRect.y); - } - - return result; -} - -DrawResult -TableBackgroundPainter::PaintRow(nsTableRowFrame* aFrame) -{ - return PaintRow(aFrame, TableBackgroundData(), TableBackgroundData(aFrame), false); -} - -DrawResult -TableBackgroundPainter::PaintRow(nsTableRowFrame* aFrame, - const TableBackgroundData& aRowGroupBGData, - TableBackgroundData aRowBGData, - bool aPassThrough) -{ - MOZ_ASSERT(aFrame, "null frame"); - - /* Load row data */ - WritingMode wm = aFrame->GetWritingMode(); - if (aPassThrough) { - aRowBGData.MakeInvisible(); - } else { - if (mIsBorderCollapse && aRowBGData.ShouldSetBCBorder()) { - LogicalMargin border(wm); - nsTableRowFrame* nextRow = aFrame->GetNextRow(); - if (nextRow) { //outer bStart after us is inner bEnd for us - border.BEnd(wm) = nextRow->GetOuterBStartContBCBorderWidth(); - } - else { //acquire rg's bEnd border - nsTableRowGroupFrame* rowGroup = static_cast<nsTableRowGroupFrame*>(aFrame->GetParent()); - rowGroup->GetContinuousBCBorderWidth(wm, border); - } - //get the rest of the borders; will overwrite all but bEnd - aFrame->GetContinuousBCBorderWidth(wm, border); - - aRowBGData.SetBCBorder(border.GetPhysicalMargin(wm)); - } - aPassThrough = !aRowBGData.IsVisible(); - } - - /* Translate */ - if (eOrigin_TableRow == mOrigin) { - /* If we originate from the row, then make the row the origin. */ - aRowBGData.mRect.MoveTo(0, 0); - } - //else: Use row group's coord system -> no translation necessary - - DrawResult result = DrawResult::SUCCESS; - - for (nsTableCellFrame* cell = aFrame->GetFirstCell(); cell; cell = cell->GetNextCell()) { - nsRect cellBGRect, rowBGRect, rowGroupBGRect, colBGRect; - ComputeCellBackgrounds(cell, aRowGroupBGData, aRowBGData, - cellBGRect, rowBGRect, - rowGroupBGRect, colBGRect); - - // Find the union of all the cell background layers. - nsRect combinedRect(cellBGRect); - combinedRect.UnionRect(combinedRect, rowBGRect); - combinedRect.UnionRect(combinedRect, rowGroupBGRect); - combinedRect.UnionRect(combinedRect, colBGRect); - - if (combinedRect.Intersects(mDirtyRect)) { - bool passCell = aPassThrough || cell->IsPseudoStackingContextFromStyle(); - result &= - PaintCell(cell, aRowGroupBGData, aRowBGData, cellBGRect, rowBGRect, - rowGroupBGRect, colBGRect, passCell); - } - } - - return result; -} - -DrawResult -TableBackgroundPainter::PaintCell(nsTableCellFrame* aCell, - const TableBackgroundData& aRowGroupBGData, - const TableBackgroundData& aRowBGData, - nsRect& aCellBGRect, - nsRect& aRowBGRect, - nsRect& aRowGroupBGRect, - nsRect& aColBGRect, - bool aPassSelf) -{ - MOZ_ASSERT(aCell, "null frame"); - - const nsStyleTableBorder* cellTableStyle; - cellTableStyle = aCell->StyleTableBorder(); - if (NS_STYLE_TABLE_EMPTY_CELLS_SHOW != cellTableStyle->mEmptyCells && - aCell->GetContentEmpty() && !mIsBorderCollapse) { - return DrawResult::SUCCESS; - } - - int32_t colIndex; - aCell->GetColIndex(colIndex); - // We're checking mNumCols instead of mCols.Length() here because mCols can - // be empty even if mNumCols > 0. - NS_ASSERTION(size_t(colIndex) < mNumCols, "out-of-bounds column index"); - if (size_t(colIndex) >= mNumCols) { - return DrawResult::SUCCESS; - } - - // If callers call PaintRowGroup or PaintRow directly, we haven't processed - // our columns. Ignore column / col group backgrounds in that case. - bool haveColumns = !mCols.IsEmpty(); - - DrawResult result = DrawResult::SUCCESS; - - //Paint column group background - if (haveColumns && mCols[colIndex].mColGroup.IsVisible()) { - nsCSSRendering::PaintBGParams params = - nsCSSRendering::PaintBGParams::ForAllLayers(*mPresContext, mRenderingContext, - mDirtyRect, - mCols[colIndex].mColGroup.mRect + mRenderPt, - mCols[colIndex].mColGroup.mFrame, - mBGPaintFlags); - params.bgClipRect = &aColBGRect; - result &= - nsCSSRendering::PaintBackgroundWithSC(params, - mCols[colIndex].mColGroup.mFrame->StyleContext(), - mCols[colIndex].mColGroup.StyleBorder(mZeroBorder)); - } - - //Paint column background - if (haveColumns && mCols[colIndex].mCol.IsVisible()) { - nsCSSRendering::PaintBGParams params = - nsCSSRendering::PaintBGParams::ForAllLayers(*mPresContext, mRenderingContext, - mDirtyRect, - mCols[colIndex].mCol.mRect + mRenderPt, - mCols[colIndex].mCol.mFrame, - mBGPaintFlags); - params.bgClipRect = &aColBGRect; - result &= - nsCSSRendering::PaintBackgroundWithSC(params, - mCols[colIndex].mCol.mFrame->StyleContext(), - mCols[colIndex].mCol.StyleBorder(mZeroBorder)); - } - - //Paint row group background - if (aRowGroupBGData.IsVisible()) { - nsCSSRendering::PaintBGParams params = - nsCSSRendering::PaintBGParams::ForAllLayers(*mPresContext, mRenderingContext, - mDirtyRect, - aRowGroupBGData.mRect + mRenderPt, - aRowGroupBGData.mFrame, mBGPaintFlags); - params.bgClipRect = &aRowGroupBGRect; - result &= - nsCSSRendering::PaintBackgroundWithSC(params, - aRowGroupBGData.mFrame->StyleContext(), - aRowGroupBGData.StyleBorder(mZeroBorder)); - } - - //Paint row background - if (aRowBGData.IsVisible()) { - nsCSSRendering::PaintBGParams params = - nsCSSRendering::PaintBGParams::ForAllLayers(*mPresContext, mRenderingContext, - mDirtyRect, - aRowBGData.mRect + mRenderPt, - aRowBGData.mFrame, mBGPaintFlags); - params.bgClipRect = &aRowBGRect; - result &= - nsCSSRendering::PaintBackgroundWithSC(params, - aRowBGData.mFrame->StyleContext(), - aRowBGData.StyleBorder(mZeroBorder)); - } - - //Paint cell background in border-collapse unless we're just passing - if (mIsBorderCollapse && !aPassSelf) { - result &= - aCell->PaintCellBackground(mRenderingContext, mDirtyRect, - aCellBGRect.TopLeft(), mBGPaintFlags); - } - - return result; -} - -void -TableBackgroundPainter::ComputeCellBackgrounds(nsTableCellFrame* aCell, - const TableBackgroundData& aRowGroupBGData, - const TableBackgroundData& aRowBGData, - nsRect& aCellBGRect, - nsRect& aRowBGRect, - nsRect& aRowGroupBGRect, - nsRect& aColBGRect) -{ - // We need to compute table background layer rects for this cell space, - // adjusted for possible relative positioning. This behavior is not specified - // at the time of this writing, but the approach below should be web - // compatible. - // - // Our goal is that relative positioning of a table part should leave - // backgrounds *under* that part unchanged. ("Under" being defined by CSS 2.1 - // Section 17.5.1.) If a cell is positioned, we do not expect the row - // background to move. On the other hand, the backgrounds of layers *above* - // the positioned part are taken along for the ride -- for example, - // positioning a row group will also cause the row background to be drawn in - // the new location, unless it has further positioning applied. - // - // Each table part layer has its position stored in the coordinate space of - // the layer below (which is to say, its geometric parent), and the stored - // position is the post-relative-positioning one. The position of each - // background layer rect is thus determined by peeling off successive table - // part layers, removing the contribution of each layer's positioning one by - // one. Every rect we generate will be the same size, the size of the cell - // space. - - // We cannot rely on the row group background data to be available, since some - // callers enter through PaintRow. - nsIFrame* rowGroupFrame = - aRowGroupBGData.mFrame ? aRowGroupBGData.mFrame : aRowBGData.mFrame->GetParent(); - - // The cell background goes at the cell's position, translated to use the same - // coordinate system as aRowBGData. - aCellBGRect = aCell->GetRect() + aRowBGData.mRect.TopLeft() + mRenderPt; - - // The row background goes at the normal position of the cell, which is to say - // the position without relative positioning applied. - aRowBGRect = aCellBGRect + (aCell->GetNormalPosition() - aCell->GetPosition()); - - // The row group background goes at the position we'd find the cell if neither - // the cell's relative positioning nor the row's were applied. - aRowGroupBGRect = aRowBGRect + - (aRowBGData.mFrame->GetNormalPosition() - aRowBGData.mFrame->GetPosition()); - - // The column and column group backgrounds (they're always at the same - // location, since relative positioning doesn't apply to columns or column - // groups) are drawn at the position we'd find the cell if none of the cell's, - // row's, or row group's relative positioning were applied. - aColBGRect = aRowGroupBGRect + - (rowGroupFrame->GetNormalPosition() - rowGroupFrame->GetPosition()); - -} |