diff options
Diffstat (limited to 'layout/base/nsLayoutUtils.h')
| -rw-r--r-- | layout/base/nsLayoutUtils.h | 95 |
1 files changed, 70 insertions, 25 deletions
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<mozilla::LogicalSize>& aPercentageBasis = mozilla::Nothing(), + const mozilla::Maybe<LogicalSize>& 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 <length-percentage> value to a definite size. + */ + template<bool clampNegativeResultToZero> + 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<true>(aGap, aPercentageBasis); + } + private: static uint32_t sFontSizeInflationEmPerLine; static uint32_t sFontSizeInflationMinTwips; |