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Bug 1084500 part 3: Make documentation for ComputeObjectAnchorPoint cover non-background use cases. r=seth

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This commit is contained in:
Daniel Holbert 2014-10-22 13:03:19 -07:00
parent 01f42ffe4d
commit 4aaae25d95
1 changed files with 16 additions and 12 deletions
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28
layout/base/nsCSSRendering.h
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@ -139,19 +139,23 @@ public:
mozilla::CSSSizeOrRatio ComputeIntrinsicSize();
/**
* Computes the placement of a background image.
* Computes the placement for a background image, or for the image data
* inside of a replaced element.
*
* @param aPos the CSS <position> value that specify's the image's position.
* @param aOriginBounds is the box to which the tiling position should be
* relative. This should correspond to 'background-origin' for the frame,
* except when painting on the canvas, in which case the origin bounds
* should be the bounds of the root element's frame.
* @param aTopLeft the top-left corner where an image tile should be drawn.
* @param aAnchorPoint a point which should be pixel-aligned by
* nsLayoutUtils::DrawImage. This is the same as aTopLeft, unless CSS
* specifies a percentage (including 'right' or 'bottom'), in which case
* it's that percentage within of aOriginBounds. So 'right' would set
* aAnchorPoint.x to aOriginBounds.XMost().
* @param aPos The CSS <position> value that specifies the image's position.
* @param aOriginBounds The box to which the tiling position should be
* relative. For background images, this should correspond to
* 'background-origin' for the frame, except when painting on the
* canvas, in which case the origin bounds should be the bounds
* of the root element's frame. For a replaced element, this should
* be the element's content-box.
* @param aTopLeft [out] The top-left corner where an image tile should be
* drawn.
* @param aAnchorPoint [out] A point which should be pixel-aligned by
* nsLayoutUtils::DrawImage. This is the same as aTopLeft, unless
* CSS specifies a percentage (including 'right' or 'bottom'), in
* which case it's that percentage within of aOriginBounds. So
* 'right' would set aAnchorPoint.x to aOriginBounds.XMost().
*
* Points are returned relative to aOriginBounds.
*/