From 8ff295747e7f5e205313e4405d5a63ce23fca993 Mon Sep 17 00:00:00 2001 From: Gaming4JC Date: Sat, 28 Sep 2019 23:36:05 -0400 Subject: Issue #1230 - Part 1: Fix Back-computing percentages for intrinsic sizing in Layout CSS-Grid List of relevant patches applied: 1398537 part 2 - [css-multicol] Implement percentages for 'column-gap' (Gecko part). 1434478 part 1 - [css-grid] Stop back-computing percentage grid gaps when the percentage basis is indefinite. Treat them as zero sized instead. 1434478 part 2 - Stop back-computing percentage padding/margin when the percentage basis is indefinite. Treat them as zero sized instead. 1434478 part 3 - Remove IntrinsicISizeOffsetData::hPctPadding/hPctMargin members since they are now unused. 1434478 part 4 - Factor out constants like NS_UNCONSTRAINEDSIZE so they can be used in headers without needing nsIFrame.h (idempotent patch). 1434478 part 5 - Create nsLayoutUtils::ResolveToLength for resolving CSS (idempotent patch). 1434478 part 6 - Propagate a percentage basis to nsIFrame::IntrinsicISizeOffsets for resolving padding/margin. This is needed only for CSS Grid since in other cases we're only using IntrinsicISizeOffsets in the inline-axis and the percentage basis is always indefinite for *intrinsic sizing*. When calculating the intrinsic size of grid items in the grid container's block axis however, we do have a definite size for the grid area in the inline-axis and it should be used per: https://drafts.csswg.org/css-grid/#algo-overview "2. Next, the track sizing algorithm resolves the sizes of the grid rows, using the grid column sizes calculated in the previous step." (Percentage padding/margin for grid items is always resolved against the grid area's inline-size nowadays.) --- layout/base/LayoutConstants.h | 31 ++++++++++++++ layout/base/moz.build | 4 ++ layout/base/nsLayoutUtils.cpp | 76 +++++++++++++--------------------- layout/base/nsLayoutUtils.h | 95 +++++++++++++++++++++++++++++++------------ 4 files changed, 133 insertions(+), 73 deletions(-) create mode 100644 layout/base/LayoutConstants.h (limited to 'layout/base') diff --git a/layout/base/LayoutConstants.h b/layout/base/LayoutConstants.h new file mode 100644 index 000000000..cd6e1c3f5 --- /dev/null +++ b/layout/base/LayoutConstants.h @@ -0,0 +1,31 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +/* constants used throughout the Layout module */ + +#ifndef LayoutConstants_h___ +#define LayoutConstants_h___ + +#include "nsSize.h" // for NS_MAXSIZE + +/** + * Constant used to indicate an unconstrained size. + */ +#define NS_UNCONSTRAINEDSIZE NS_MAXSIZE + +// NOTE: There are assumptions all over that these have the same value, +// namely NS_UNCONSTRAINEDSIZE. +#define NS_INTRINSICSIZE NS_UNCONSTRAINEDSIZE +#define NS_AUTOHEIGHT NS_UNCONSTRAINEDSIZE +#define NS_AUTOOFFSET NS_UNCONSTRAINEDSIZE + +// +1 is to avoid clamped huge margin values being processed as auto margins +#define NS_AUTOMARGIN (NS_UNCONSTRAINEDSIZE + 1) + +#define NS_INTRINSIC_WIDTH_UNKNOWN nscoord_MIN + + +#endif // LayoutConstants_h___ diff --git a/layout/base/moz.build b/layout/base/moz.build index 4308a6e4d..afc683665 100644 --- a/layout/base/moz.build +++ b/layout/base/moz.build @@ -13,6 +13,9 @@ with Files('Display*'): with Files('FrameLayerBuilder.*'): BUG_COMPONENT = ('Core', 'Layout: View Rendering') +with Files('LayoutConstants.*'): + BUG_COMPONENT = ('Core', 'Layout: View Rendering') + with Files('LayerState.*'): BUG_COMPONENT = ('Core', 'Layout: View Rendering') @@ -63,6 +66,7 @@ EXPORTS += [ 'FrameLayerBuilder.h', 'FrameProperties.h', 'LayerState.h', + 'LayoutConstants.h', 'LayoutLogging.h', 'nsArenaMemoryStats.h', 'nsBidi.h', diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp index 06690b208..21d20c69f 100644 --- a/layout/base/nsLayoutUtils.cpp +++ b/layout/base/nsLayoutUtils.cpp @@ -4671,8 +4671,6 @@ GetDefiniteSize(const nsStyleCoord& aStyle, nscoord pb = aIsInlineAxis ? aPercentageBasis.value().ISize(wm) : aPercentageBasis.value().BSize(wm); if (pb == NS_UNCONSTRAINEDSIZE) { - // XXXmats given that we're calculating an intrinsic size here, - // maybe we should back-compute the calc-size using AddPercents? return false; } *aResult = std::max(0, calc->mLength + @@ -4916,12 +4914,9 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext, nscoord result = aContentSize; nscoord min = aContentMinSize; nscoord coordOutsideSize = 0; - float pctOutsideSize = 0; - float pctTotal = 0.0f; if (!(aFlags & nsLayoutUtils::IGNORE_PADDING)) { coordOutsideSize += aOffsets.hPadding; - pctOutsideSize += aOffsets.hPctPadding; } coordOutsideSize += aOffsets.hBorder; @@ -4929,21 +4924,15 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext, if (aBoxSizing == StyleBoxSizing::Border) { min += coordOutsideSize; result = NSCoordSaturatingAdd(result, coordOutsideSize); - pctTotal += pctOutsideSize; coordOutsideSize = 0; - pctOutsideSize = 0.0f; } coordOutsideSize += aOffsets.hMargin; - pctOutsideSize += aOffsets.hPctMargin; min += coordOutsideSize; result = NSCoordSaturatingAdd(result, coordOutsideSize); - pctTotal += pctOutsideSize; - const bool shouldAddPercent = aType == nsLayoutUtils::PREF_ISIZE || - (aFlags & nsLayoutUtils::ADD_PERCENTS); nscoord size; if (aType == nsLayoutUtils::MIN_ISIZE && (((aStyleSize.HasPercent() || aStyleMaxSize.HasPercent()) && @@ -4961,18 +4950,6 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext, GetIntrinsicCoord(aStyleSize, aRenderingContext, aFrame, PROP_WIDTH, size)) { result = size + coordOutsideSize; - if (shouldAddPercent) { - result = nsLayoutUtils::AddPercents(result, pctOutsideSize); - } - } else { - // NOTE: We could really do a lot better for percents and for some - // cases of calc() containing percent (certainly including any where - // the coefficient on the percent is positive and there are no max() - // expressions). However, doing better for percents wouldn't be - // backwards compatible. - if (shouldAddPercent) { - result = nsLayoutUtils::AddPercents(result, pctTotal); - } } nscoord maxSize = aFixedMaxSize ? *aFixedMaxSize : 0; @@ -4980,9 +4957,6 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext, GetIntrinsicCoord(aStyleMaxSize, aRenderingContext, aFrame, PROP_MAX_WIDTH, maxSize)) { maxSize += coordOutsideSize; - if (shouldAddPercent) { - maxSize = nsLayoutUtils::AddPercents(maxSize, pctOutsideSize); - } if (result > maxSize) { result = maxSize; } @@ -4993,17 +4967,11 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext, GetIntrinsicCoord(aStyleMinSize, aRenderingContext, aFrame, PROP_MIN_WIDTH, minSize)) { minSize += coordOutsideSize; - if (shouldAddPercent) { - minSize = nsLayoutUtils::AddPercents(minSize, pctOutsideSize); - } if (result < minSize) { result = minSize; } } - if (shouldAddPercent) { - min = nsLayoutUtils::AddPercents(min, pctTotal); - } if (result < min) { result = min; } @@ -5020,9 +4988,6 @@ AddIntrinsicSizeOffset(nsRenderingContext* aRenderingContext, : devSize.width); // GetMinimumWidgetSize() returns a border-box width. themeSize += aOffsets.hMargin; - if (shouldAddPercent) { - themeSize = nsLayoutUtils::AddPercents(themeSize, aOffsets.hPctMargin); - } if (themeSize > result || !canOverride) { result = themeSize; } @@ -5267,9 +5232,19 @@ nsLayoutUtils::IntrinsicForAxis(PhysicalAxis aAxis, min = aFrame->GetMinISize(aRenderingContext); } + nscoord pmPercentageBasis = NS_UNCONSTRAINEDSIZE; + if (aPercentageBasis.isSome()) { + // The padding/margin percentage basis is the inline-size in the parent's + // writing-mode. + auto childWM = aFrame->GetWritingMode(); + pmPercentageBasis = + aFrame->GetParent()->GetWritingMode().IsOrthogonalTo(childWM) ? + aPercentageBasis->BSize(childWM) : + aPercentageBasis->ISize(childWM); + } nsIFrame::IntrinsicISizeOffsetData offsets = - MOZ_LIKELY(isInlineAxis) ? aFrame->IntrinsicISizeOffsets() - : aFrame->IntrinsicBSizeOffsets(); + MOZ_LIKELY(isInlineAxis) ? aFrame->IntrinsicISizeOffsets(pmPercentageBasis) + : aFrame->IntrinsicBSizeOffsets(pmPercentageBasis); nscoord contentBoxSize = result; result = AddIntrinsicSizeOffset(aRenderingContext, aFrame, offsets, aType, boxSizing, result, min, styleISize, @@ -5310,11 +5285,12 @@ nsLayoutUtils::IntrinsicForContainer(nsRenderingContext* aRenderingContext, } /* static */ nscoord -nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis aAxis, +nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis aAxis, nsRenderingContext* aRC, - nsIFrame* aFrame, - IntrinsicISizeType aType, - uint32_t aFlags) + nsIFrame* aFrame, + IntrinsicISizeType aType, + const LogicalSize& aPercentageBasis, + uint32_t aFlags) { MOZ_ASSERT(aFrame); MOZ_ASSERT(aFrame->IsFlexOrGridItem(), @@ -5328,9 +5304,7 @@ nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis aAxis, aWM.IsVertical() ? "vertical" : "horizontal"); #endif - // Note: this method is only meant for grid/flex items which always - // include percentages in their intrinsic size. - aFlags |= nsLayoutUtils::ADD_PERCENTS; + // Note: this method is only meant for grid/flex items. const nsStylePosition* const stylePos = aFrame->StylePosition(); const nsStyleCoord* style = aAxis == eAxisHorizontal ? &stylePos->mMinWidth : &stylePos->mMinHeight; @@ -5375,11 +5349,17 @@ nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis aAxis, // wrapping inside of it should not apply font size inflation. AutoMaybeDisableFontInflation an(aFrame); - PhysicalAxis ourInlineAxis = - aFrame->GetWritingMode().PhysicalAxis(eLogicalAxisInline); + // The padding/margin percentage basis is the inline-size in the parent's + // writing-mode. + auto childWM = aFrame->GetWritingMode(); + nscoord pmPercentageBasis = + aFrame->GetParent()->GetWritingMode().IsOrthogonalTo(childWM) ? + aPercentageBasis.BSize(childWM) : + aPercentageBasis.ISize(childWM); + PhysicalAxis ourInlineAxis = childWM.PhysicalAxis(eLogicalAxisInline); nsIFrame::IntrinsicISizeOffsetData offsets = - ourInlineAxis == aAxis ? aFrame->IntrinsicISizeOffsets() - : aFrame->IntrinsicBSizeOffsets(); + ourInlineAxis == aAxis ? aFrame->IntrinsicISizeOffsets(pmPercentageBasis) + : aFrame->IntrinsicBSizeOffsets(pmPercentageBasis); nscoord result = 0; nscoord min = 0; diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h index 0a82dbf6a..bba1f3265 100644 --- a/layout/base/nsLayoutUtils.h +++ b/layout/base/nsLayoutUtils.h @@ -6,6 +6,7 @@ #ifndef nsLayoutUtils_h__ #define nsLayoutUtils_h__ +#include "LayoutConstants.h" #include "mozilla/MemoryReporting.h" #include "mozilla/ArrayUtils.h" #include "mozilla/Maybe.h" @@ -154,6 +155,7 @@ public: typedef mozilla::ScreenMargin ScreenMargin; typedef mozilla::LayoutDeviceIntSize LayoutDeviceIntSize; typedef mozilla::StyleGeometryBox StyleGeometryBox; + typedef mozilla::LogicalSize LogicalSize; /** * Finds previously assigned ViewID for the given content element, if any. @@ -1381,7 +1383,8 @@ public: * variations if that's what matches aAxis) and its padding, border and margin * in the corresponding dimension. * @param aPercentageBasis an optional percentage basis (in aFrame's WM). - * Pass NS_UNCONSTRAINEDSIZE if the basis is indefinite in either/both axes. + * If the basis is indefinite in a given axis, pass a size with + * NS_UNCONSTRAINEDSIZE in that component. * If you pass Nothing() a percentage basis will be calculated from aFrame's * ancestors' computed size in the relevant axis, if needed. * @param aMarginBoxMinSizeClamp make the result fit within this margin-box @@ -1395,14 +1398,13 @@ public: IGNORE_PADDING = 0x01, BAIL_IF_REFLOW_NEEDED = 0x02, // returns NS_INTRINSIC_WIDTH_UNKNOWN if so MIN_INTRINSIC_ISIZE = 0x04, // use min-width/height instead of width/height - ADD_PERCENTS = 0x08, // apply AddPercents also for MIN_ISIZE }; static nscoord IntrinsicForAxis(mozilla::PhysicalAxis aAxis, nsRenderingContext* aRenderingContext, nsIFrame* aFrame, IntrinsicISizeType aType, - const mozilla::Maybe& aPercentageBasis = mozilla::Nothing(), + const mozilla::Maybe& aPercentageBasis = mozilla::Nothing(), uint32_t aFlags = 0, nscoord aMarginBoxMinSizeClamp = NS_MAXSIZE); /** @@ -1427,31 +1429,18 @@ public: * calculates the result as if the 'min-' computed value is zero. * Otherwise, return NS_UNCONSTRAINEDSIZE. * + * @param aPercentageBasis the percentage basis (in aFrame's WM). + * Pass NS_UNCONSTRAINEDSIZE if the basis is indefinite in either/both axes. * @note this behavior is specific to Grid/Flexbox (currently) so aFrame * should be a grid/flex item. */ - static nscoord MinSizeContributionForAxis(mozilla::PhysicalAxis aAxis, - nsRenderingContext* aRC, - nsIFrame* aFrame, - IntrinsicISizeType aType, - uint32_t aFlags = 0); - - /** - * This function increases an initial intrinsic size, 'aCurrent', according - * to the given 'aPercent', such that the size-increase makes up exactly - * 'aPercent' percent of the returned value. If 'aPercent' or 'aCurrent' are - * less than or equal to zero the original 'aCurrent' value is returned. - * If 'aPercent' is greater than or equal to 1.0 the value nscoord_MAX is - * returned. - */ - static nscoord AddPercents(nscoord aCurrent, float aPercent) - { - if (aPercent > 0.0f && aCurrent > 0) { - return MOZ_UNLIKELY(aPercent >= 1.0f) ? nscoord_MAX - : NSToCoordRound(float(aCurrent) / (1.0f - aPercent)); - } - return aCurrent; - } + static nscoord + MinSizeContributionForAxis(mozilla::PhysicalAxis aAxis, + nsRenderingContext* aRC, + nsIFrame* aFrame, + IntrinsicISizeType aType, + const LogicalSize& aPercentageBasis, + uint32_t aFlags = 0); /* * Convert nsStyleCoord to nscoord when percentages depend on the @@ -2876,6 +2865,62 @@ public: static nsRect ComputeGeometryBox(nsIFrame* aFrame, StyleGeometryBox aGeometryBox); + /** + * Resolve a CSS value to a definite size. + */ + template + static nscoord ResolveToLength(const nsStyleCoord& aCoord, + nscoord aPercentageBasis) + { + NS_WARNING_ASSERTION(aPercentageBasis >= nscoord(0), "nscoord overflow?"); + + switch (aCoord.GetUnit()) { + case eStyleUnit_Coord: + MOZ_ASSERT(!clampNegativeResultToZero || aCoord.GetCoordValue() >= 0, + "This value should have been rejected by the style system"); + return aCoord.GetCoordValue(); + case eStyleUnit_Percent: + if (aPercentageBasis == NS_UNCONSTRAINEDSIZE) { + return nscoord(0); + } + MOZ_ASSERT(!clampNegativeResultToZero || aCoord.GetPercentValue() >= 0, + "This value should have been rejected by the style system"); + return NSToCoordFloorClamped(aPercentageBasis * + aCoord.GetPercentValue()); + case eStyleUnit_Calc: { + nsStyleCoord::Calc* calc = aCoord.GetCalcValue(); + nscoord result; + if (aPercentageBasis == NS_UNCONSTRAINEDSIZE) { + result = calc->mLength; + } else { + result = calc->mLength + + NSToCoordFloorClamped(aPercentageBasis * calc->mPercent); + } + if (clampNegativeResultToZero && result < 0) { + return nscoord(0); + } + return result; + } + default: + MOZ_ASSERT_UNREACHABLE("Unexpected unit!"); + return nscoord(0); + } + } + + /** + * Resolve a column-gap/row-gap to a definite size. + * @note This method resolves 'normal' to zero. + * Callers who want different behavior should handle 'normal' on their own. + */ + static nscoord ResolveGapToLength(const nsStyleCoord& aGap, + nscoord aPercentageBasis) + { + if (aGap.GetUnit() == eStyleUnit_Normal) { + return nscoord(0); + } + return ResolveToLength(aGap, aPercentageBasis); + } + private: static uint32_t sFontSizeInflationEmPerLine; static uint32_t sFontSizeInflationMinTwips; -- cgit v1.2.3