本文整理汇总了C++中nsIntRect::ToAppUnits方法的典型用法代码示例。如果您正苦于以下问题：C++ nsIntRect::ToAppUnits方法的具体用法？C++ nsIntRect::ToAppUnits怎么用？C++ nsIntRect::ToAppUnits使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类nsIntRect的用法示例。
在下文中一共展示了nsIntRect::ToAppUnits方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: GetOffsetToUserSpace
nsIntRect
nsSVGIntegrationUtils::AdjustInvalidAreaForSVGEffects(nsIFrame* aFrame,
const nsPoint& aToReferenceFrame,
const nsIntRect& aInvalidRect)
{
// Don't bother calling GetEffectProperties; the filter property should
// already have been set up during reflow/ComputeFrameEffectsRect
nsIFrame* firstFrame =
nsLayoutUtils::GetFirstContinuationOrSpecialSibling(aFrame);
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(firstFrame);
if (!effectProperties.mFilter)
return aInvalidRect;
nsSVGFilterProperty *prop = nsSVGEffects::GetFilterProperty(firstFrame);
if (!prop || !prop->IsInObserverList()) {
return aInvalidRect;
}
int32_t appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
nsSVGFilterFrame* filterFrame = prop->GetFilterFrame();
if (!filterFrame) {
// The frame is either not there or not currently available,
// perhaps because we're in the middle of tearing stuff down.
// Be conservative, return our visual overflow rect relative
// to the reference frame.
nsRect overflow = aFrame->GetVisualOverflowRect() + aToReferenceFrame;
return overflow.ToOutsidePixels(appUnitsPerDevPixel);
}
// Convert aInvalidRect into "user space" in app units:
nsPoint toUserSpace =
aFrame->GetOffsetTo(firstFrame) + GetOffsetToUserSpace(firstFrame);
// The initial rect was relative to the reference frame, so we need to
// remove that offset to get a rect relative to the current frame.
toUserSpace -= aToReferenceFrame;
nsRect preEffectsRect = aInvalidRect.ToAppUnits(appUnitsPerDevPixel) + toUserSpace;
// Adjust the dirty area for effects, and shift it back to being relative to
// the reference frame.
nsRect result = filterFrame->GetPostFilterDirtyArea(firstFrame, preEffectsRect) -
toUserSpace;
// Return the result, in pixels relative to the reference frame.
return result.ToOutsidePixels(appUnitsPerDevPixel);
}