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3917f9c2e1
gecko/layout/base/nsLayoutUtils.h
L. David Baron 3917f9c2e1 Implement computation of font size inflation for improved readibility of text on mobile devices. (Bug 627842, patch 4) r=roc 
This implements computation of the font size inflation factor for a
given frame.  Since Fennec does layout using a fake viewport whose width
represents a typical viewport width on the desktop and then allows users
to pan and zoom, fonts are not always readable even when zoomed.  The
goal of this font size inflation is to ensure that when a block of text
is zoomed to fill the width of the device, the fonts are large enough to
read.  We do this by increasing the font sizes in the page.  Since this
increase is a function of the width of the text's container, the
inflation must be performed (in later patches in this series) after
style data computation and after intrinsic width computation.

The font size inflation factor does not vary *within* a block.

Since sync uses a whitelist (the services.sync.prefs.sync.* prefs) for
preferences (i.e., preferences are not synced by default), this patch
does not make any changes relating to sync, since we do not want the
inflation preferences synced across devices (since preferred settings
are likely to be device-specific).
2011-11-23 18:48:23 -08:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.org code.
*
* The Initial Developer of the Original Code is
* Boris Zbarsky <bzbarsky@mit.edu>.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Boris Zbarsky <bzbarsky@mit.edu> (original author)
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
* Mats Palmgren <matspal@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsLayoutUtils_h__
#define nsLayoutUtils_h__
class nsIFormControlFrame;
class nsPresContext;
class nsIContent;
class nsIAtom;
class nsIScrollableFrame;
class nsIDOMEvent;
class nsRegion;
class nsDisplayListBuilder;
class nsDisplayItem;
class nsFontMetrics;
class nsClientRectList;
class nsFontFaceList;
#include "prtypes.h"
#include "nsStyleContext.h"
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsIView.h"
#include "nsIFrame.h"
#include "nsThreadUtils.h"
#include "nsIPresShell.h"
#include "nsIPrincipal.h"
#include "gfxPattern.h"
#include "imgIContainer.h"
#include "nsCSSPseudoElements.h"
#include "nsHTMLReflowState.h"
#include "nsIFrameLoader.h"
#include "Layers.h"
class nsBlockFrame;
class gfxDrawable;
/**
* nsLayoutUtils is a namespace class used for various helper
* functions that are useful in multiple places in layout. The goal
* is not to define multiple copies of the same static helper.
*/
class nsLayoutUtils
{
typedef gfxPattern::GraphicsFilter GraphicsFilter;
public:
typedef mozilla::layers::FrameMetrics::ViewID ViewID;
/**
* Finds previously assigned or generates a unique ViewID for the given
* content element.
*/
static ViewID FindIDFor(nsIContent* aContent);
/**
* Find content for given ID.
*/
static nsIContent* FindContentFor(ViewID aId);
/**
* Get display port for the given element.
*/
static bool GetDisplayPort(nsIContent* aContent, nsRect *aResult);
/**
* Use heuristics to figure out the child list that
* aChildFrame is currently in.
*/
static nsIFrame::ChildListID GetChildListNameFor(nsIFrame* aChildFrame);
/**
* GetBeforeFrame returns the outermost :before frame of the given frame, if
* one exists. This is typically O(1). The frame passed in must be
* the first-in-flow.
*
* @param aFrame the frame whose :before is wanted
* @return the :before frame or nsnull if there isn't one
*/
static nsIFrame* GetBeforeFrame(nsIFrame* aFrame);
/**
* GetAfterFrame returns the outermost :after frame of the given frame, if one
* exists. This will walk the in-flow chain to the last-in-flow if
* needed. This function is typically O(N) in the number of child
* frames, following in-flows, etc.
*
* @param aFrame the frame whose :after is wanted
* @return the :after frame or nsnull if there isn't one
*/
static nsIFrame* GetAfterFrame(nsIFrame* aFrame);
/**
* Given a frame, search up the frame tree until we find an
* ancestor that (or the frame itself) is of type aFrameType, if any.
*
* @param aFrame the frame to start at
* @param aFrameType the frame type to look for
* @return a frame of the given type or nsnull if no
* such ancestor exists
*/
static nsIFrame* GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType);
/**
* Given a frame, search up the frame tree until we find an
* ancestor that (or the frame itself) is a "Page" frame, if any.
*
* @param aFrame the frame to start at
* @return a frame of type nsGkAtoms::pageFrame or nsnull if no
* such ancestor exists
*/
static nsIFrame* GetPageFrame(nsIFrame* aFrame)
{
return GetClosestFrameOfType(aFrame, nsGkAtoms::pageFrame);
}
/**
* Given a frame which is the primary frame for an element,
* return the frame that has the non-psuedoelement style context for
* the content.
* This is aPrimaryFrame itself except for tableOuter frames.
*/
static nsIFrame* GetStyleFrame(nsIFrame* aPrimaryFrame);
/**
* IsGeneratedContentFor returns true if aFrame is the outermost
* frame for generated content of type aPseudoElement for aContent.
* aFrame *might not* have the aPseudoElement pseudo-style! For example
* it might be a table outer frame and the inner table frame might
* have the pseudo-style.
*
* @param aContent the content node we're looking at. If this is
* null, then we just assume that aFrame has the right content
* pointer.
* @param aFrame the frame we're looking at
* @param aPseudoElement the pseudo type we're interested in
* @return whether aFrame is the generated aPseudoElement frame for aContent
*/
static bool IsGeneratedContentFor(nsIContent* aContent, nsIFrame* aFrame,
nsIAtom* aPseudoElement);
#ifdef DEBUG
// TODO: remove, see bug 598468.
static bool gPreventAssertInCompareTreePosition;
#endif // DEBUG
/**
* CompareTreePosition determines whether aContent1 comes before or
* after aContent2 in a preorder traversal of the content tree.
*
* @param aCommonAncestor either null, or a common ancestor of
* aContent1 and aContent2. Actually this is
* only a hint; if it's not an ancestor of
* aContent1 or aContent2, this function will
* still work, but it will be slower than
* normal.
* @return < 0 if aContent1 is before aContent2
* > 0 if aContent1 is after aContent2,
* 0 otherwise (meaning they're the same, or they're in
* different documents)
*/
static PRInt32 CompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
const nsIContent* aCommonAncestor = nsnull)
{
return DoCompareTreePosition(aContent1, aContent2, -1, 1, aCommonAncestor);
}
/*
* More generic version of |CompareTreePosition|. |aIf1Ancestor|
* gives the value to return when 1 is an ancestor of 2, and likewise
* for |aIf2Ancestor|. Passing (-1, 1) gives preorder traversal
* order, and (1, -1) gives postorder traversal order.
*/
static PRInt32 DoCompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
PRInt32 aIf1Ancestor,
PRInt32 aIf2Ancestor,
const nsIContent* aCommonAncestor = nsnull);
/**
* CompareTreePosition determines whether aFrame1 comes before or
* after aFrame2 in a preorder traversal of the frame tree, where out
* of flow frames are treated as children of their placeholders. This is
* basically the same ordering as DoCompareTreePosition(nsIContent*) except
* that it handles anonymous content properly and there are subtleties with
* continuations.
*
* @param aCommonAncestor either null, or a common ancestor of
* aContent1 and aContent2. Actually this is
* only a hint; if it's not an ancestor of
* aContent1 or aContent2, this function will
* still work, but it will be slower than
* normal.
* @return < 0 if aContent1 is before aContent2
* > 0 if aContent1 is after aContent2,
* 0 otherwise (meaning they're the same, or they're in
* different frame trees)
*/
static PRInt32 CompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
nsIFrame* aCommonAncestor = nsnull)
{
return DoCompareTreePosition(aFrame1, aFrame2, -1, 1, aCommonAncestor);
}
/*
* More generic version of |CompareTreePosition|. |aIf1Ancestor|
* gives the value to return when 1 is an ancestor of 2, and likewise
* for |aIf2Ancestor|. Passing (-1, 1) gives preorder traversal
* order, and (1, -1) gives postorder traversal order.
*/
static PRInt32 DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
PRInt32 aIf1Ancestor,
PRInt32 aIf2Ancestor,
nsIFrame* aCommonAncestor = nsnull);
/**
* GetLastContinuationWithChild gets the last continuation in aFrame's chain
* that has a child, or the first continuation if the frame has no children.
*/
static nsIFrame* GetLastContinuationWithChild(nsIFrame* aFrame);
/**
* GetLastSibling simply finds the last sibling of aFrame, or returns nsnull if
* aFrame is null.
*/
static nsIFrame* GetLastSibling(nsIFrame* aFrame);
/**
* FindSiblingViewFor locates the child of aParentView that aFrame's
* view should be inserted 'above' (i.e., before in sibling view
* order). This is the first child view of aParentView whose
* corresponding content is before aFrame's content (view siblings
* are in reverse content order).
*/
static nsIView* FindSiblingViewFor(nsIView* aParentView, nsIFrame* aFrame);
/**
* Get the parent of aFrame. If aFrame is the root frame for a document,
* and the document has a parent document in the same view hierarchy, then
* we try to return the subdocumentframe in the parent document.
* @param aExtraOffset [in/out] if non-null, then as we cross documents
* an extra offset may be required and it will be added to aCrossDocOffset.
* Be careful dealing with this extra offset as it is in app units of the
* parent document, which may have a different app units per dev pixel ratio
* than the child document.
*/
static nsIFrame* GetCrossDocParentFrame(const nsIFrame* aFrame,
nsPoint* aCrossDocOffset = nsnull);
/**
* IsProperAncestorFrame checks whether aAncestorFrame is an ancestor
* of aFrame and not equal to aFrame.
* @param aCommonAncestor nsnull, or a common ancestor of aFrame and
* aAncestorFrame. If non-null, this can bound the search and speed up
* the function
*/
static bool IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor = nsnull);
/**
* Like IsProperAncestorFrame, but looks across document boundaries.
*
* Just like IsAncestorFrameCrossDoc, except that it returns false when
* aFrame == aAncestorFrame.
*/
static bool IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor = nsnull);
/**
* IsAncestorFrameCrossDoc checks whether aAncestorFrame is an ancestor
* of aFrame or equal to aFrame, looking across document boundaries.
* @param aCommonAncestor nsnull, or a common ancestor of aFrame and
* aAncestorFrame. If non-null, this can bound the search and speed up
* the function.
*
* Just like IsProperAncestorFrameCrossDoc, except that it returns true when
* aFrame == aAncestorFrame.
*/
static bool IsAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor = nsnull);
/**
* Finds the nearest ancestor frame that is the root of an "actively
* scrolled" frame subtree, or aStopAtAncestor if there is no
* such ancestor before we reach aStopAtAncestor in the ancestor chain.
* We expect frames with the same "active scrolled root" to be
* scrolled together, so we'll place them in the same ThebesLayer.
*/
static nsIFrame* GetActiveScrolledRootFor(nsIFrame* aFrame,
nsIFrame* aStopAtAncestor);
static nsIFrame* GetActiveScrolledRootFor(nsDisplayItem* aItem,
nsDisplayListBuilder* aBuilder,
bool* aShouldFixToViewport = nsnull);
static bool ScrolledByViewportScrolling(nsIFrame* aActiveScrolledRoot,
nsDisplayListBuilder* aBuilder);
/**
* GetFrameFor returns the root frame for a view
* @param aView is the view to return the root frame for
* @return the root frame for the view
*/
static nsIFrame* GetFrameFor(nsIView *aView) { return aView->GetFrame(); }
/**
* GetScrollableFrameFor returns the scrollable frame for a scrolled frame
*/
static nsIScrollableFrame* GetScrollableFrameFor(nsIFrame *aScrolledFrame);
/**
* GetNearestScrollableFrameForDirection locates the first ancestor of
* aFrame (or aFrame itself) that is scrollable with overflow:scroll or
* overflow:auto in the given direction and where either the scrollbar for
* that direction is visible or the frame can be scrolled by some
* positive amount in that direction.
* The search extends across document boundaries.
*
* @param aFrame the frame to start with
* @param aDirection Whether it's for horizontal or vertical scrolling.
* @return the nearest scrollable frame or nsnull if not found
*/
enum Direction { eHorizontal, eVertical };
static nsIScrollableFrame* GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
Direction aDirection);
/**
* GetNearestScrollableFrame locates the first ancestor of aFrame
* (or aFrame itself) that is scrollable with overflow:scroll or
* overflow:auto in some direction.
* The search extends across document boundaries.
*
* @param aFrame the frame to start with
* @return the nearest scrollable frame or nsnull if not found
*/
static nsIScrollableFrame* GetNearestScrollableFrame(nsIFrame* aFrame);
/**
* HasPseudoStyle returns true if aContent (whose primary style
* context is aStyleContext) has the aPseudoElement pseudo-style
* attached to it; returns false otherwise.
*
* @param aContent the content node we're looking at
* @param aStyleContext aContent's style context
* @param aPseudoElement the id of the pseudo style we care about
* @param aPresContext the presentation context
* @return whether aContent has aPseudoElement style attached to it
*/
static bool HasPseudoStyle(nsIContent* aContent,
nsStyleContext* aStyleContext,
nsCSSPseudoElements::Type aPseudoElement,
nsPresContext* aPresContext);
/**
* If this frame is a placeholder for a float, then return the float,
* otherwise return nsnull. aPlaceholder must be a placeholder frame.
*/
static nsIFrame* GetFloatFromPlaceholder(nsIFrame* aPlaceholder);
// Combine aNewBreakType with aOrigBreakType, but limit the break types
// to NS_STYLE_CLEAR_LEFT, RIGHT, LEFT_AND_RIGHT.
static PRUint8 CombineBreakType(PRUint8 aOrigBreakType, PRUint8 aNewBreakType);
/**
* Get the coordinates of a given DOM mouse event, relative to a given
* frame. Works only for DOM events generated by nsGUIEvents.
* @param aDOMEvent the event
* @param aFrame the frame to make coordinates relative to
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
* for some reason the coordinates for the mouse are not known (e.g.,
* the event is not a GUI event).
*/
static nsPoint GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent,
nsIFrame* aFrame);
/**
* Get the coordinates of a given native mouse event, relative to a given
* frame.
* @param aEvent the event
* @param aFrame the frame to make coordinates relative to
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
* for some reason the coordinates for the mouse are not known (e.g.,
* the event is not a GUI event).
*/
static nsPoint GetEventCoordinatesRelativeTo(const nsEvent* aEvent,
nsIFrame* aFrame);
/**
* Get the popup frame of a given native mouse event.
* @param aPresContext only check popups within aPresContext or a descendant
* @param aEvent the event.
* @return Null, if there is no popup frame at the point, otherwise,
* returns top-most popup frame at the point.
*/
static nsIFrame* GetPopupFrameForEventCoordinates(nsPresContext* aPresContext,
const nsEvent* aEvent);
/**
* Translate from widget coordinates to the view's coordinates
* @param aPresContext the PresContext for the view
* @param aWidget the widget
* @param aPt the point relative to the widget
* @param aView view to which returned coordinates are relative
* @return the point in the view's coordinates
*/
static nsPoint TranslateWidgetToView(nsPresContext* aPresContext,
nsIWidget* aWidget, nsIntPoint aPt,
nsIView* aView);
/**
* Given a matrix and a point, let T be the transformation matrix translating points
* in the coordinate space with origin aOrigin to the coordinate space used by the
* matrix. If M is the stored matrix, this function returns (T-1)MT, the matrix
* that's equivalent to aMatrix but in the coordinate space that treats aOrigin
* as the origin.
*
* @param aOrigin The origin to translate to.
* @param aMatrix The matrix to change the basis of.
* @return A matrix equivalent to aMatrix, but operating in the coordinate system with
* origin aOrigin.
*/
static gfx3DMatrix ChangeMatrixBasis(const gfxPoint3D &aOrigin, const gfx3DMatrix &aMatrix);
/**
* Find IDs corresponding to a scrollable content element in the child process.
* In correspondence with the shadow layer tree, you can use this to perform a
* hit test that corresponds to a specific shadow layer that you can then perform
* transformations on to do parent-side scrolling.
*
* @param aFrame The root frame of a stack context
* @param aTarget The rect to hit test relative to the frame origin
* @param aOutIDs All found IDs are added here
* @param aIgnoreRootScrollFrame a boolean to control if the display list
* builder should ignore the root scroll frame
*/
static nsresult GetRemoteContentIds(nsIFrame* aFrame,
const nsRect& aTarget,
nsTArray<ViewID> &aOutIDs,
bool aIgnoreRootScrollFrame);
/**
* Given aFrame, the root frame of a stacking context, find its descendant
* frame under the point aPt that receives a mouse event at that location,
* or nsnull if there is no such frame.
* @param aPt the point, relative to the frame origin
* @param aShouldIgnoreSuppression a boolean to control if the display
* list builder should ignore paint suppression or not
* @param aIgnoreRootScrollFrame whether or not the display list builder
* should ignore the root scroll frame.
*/
static nsIFrame* GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt,
bool aShouldIgnoreSuppression = false,
bool aIgnoreRootScrollFrame = false);
/**
* Given aFrame, the root frame of a stacking context, find all descendant
* frames under the area of a rectangle that receives a mouse event,
* or nsnull if there is no such frame.
* @param aRect the rect, relative to the frame origin
* @param aOutFrames an array to add all the frames found
* @param aShouldIgnoreSuppression a boolean to control if the display
* list builder should ignore paint suppression or not
* @param aIgnoreRootScrollFrame whether or not the display list builder
* should ignore the root scroll frame.
*/
static nsresult GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
nsTArray<nsIFrame*> &aOutFrames,
bool aShouldIgnoreSuppression = false,
bool aIgnoreRootScrollFrame = false);
static nsRect TransformRectToBoundsInAncestor(nsIFrame* aFrame,
const nsRect& aRect,
nsIFrame* aStopAtAncestor);
/**
* Given a point in the global coordinate space, returns that point expressed
* in the coordinate system of aFrame. This effectively inverts all transforms
* between this point and the root frame.
*
* @param aFrame The frame that acts as the coordinate space container.
* @param aPoint The point, in the global space, to get in the frame-local space.
* @return aPoint, expressed in aFrame's canonical coordinate space.
*/
static nsPoint InvertTransformsToRoot(nsIFrame* aFrame,
const nsPoint &aPt);
/**
* Helper function that, given a rectangle and a matrix, returns the smallest
* rectangle containing the image of the source rectangle.
*
* @param aBounds The rectangle to transform.
* @param aMatrix The matrix to transform it with.
* @param aFactor The number of app units per graphics unit.
* @return The smallest rect that contains the image of aBounds.
*/
static nsRect MatrixTransformRect(const nsRect &aBounds,
const gfx3DMatrix &aMatrix, float aFactor);
/**
* Helper function that, given a rectangle and a matrix, returns the smallest
* rectangle containing the image of the source rectangle rounded out to the nearest
* pixel value.
*
* @param aBounds The rectangle to transform.
* @param aMatrix The matrix to transform it with.
* @param aFactor The number of app units per graphics unit.
* @return The smallest rect that contains the image of aBounds.
*/
static nsRect MatrixTransformRectOut(const nsRect &aBounds,
const gfx3DMatrix &aMatrix, float aFactor);
/**
* Helper function that, given a point and a matrix, returns the image
* of that point under the matrix transform.
*
* @param aPoint The point to transform.
* @param aMatrix The matrix to transform it with.
* @param aFactor The number of app units per graphics unit.
* @return The image of the point under the transform.
*/
static nsPoint MatrixTransformPoint(const nsPoint &aPoint,
const gfx3DMatrix &aMatrix, float aFactor);
/**
* Given a graphics rectangle in graphics space, return a rectangle in
* app space that contains the graphics rectangle, rounding out as necessary.
*
* @param aRect The graphics rect to round outward.
* @param aFactor The number of app units per graphics unit.
* @return The smallest rectangle in app space that contains aRect.
*/
static nsRect RoundGfxRectToAppRect(const gfxRect &aRect, float aFactor);
/**
* Returns a subrectangle of aContainedRect that is entirely inside the rounded
* rect. Complex cases are handled conservatively by returning a smaller
* rect than necessary.
*/
static nsRegion RoundedRectIntersectRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect);
enum {
PAINT_IN_TRANSFORM = 0x01,
PAINT_SYNC_DECODE_IMAGES = 0x02,
PAINT_WIDGET_LAYERS = 0x04,
PAINT_IGNORE_SUPPRESSION = 0x08,
PAINT_DOCUMENT_RELATIVE = 0x10,
PAINT_HIDE_CARET = 0x20,
PAINT_ALL_CONTINUATIONS = 0x40,
PAINT_TO_WINDOW = 0x80,
PAINT_EXISTING_TRANSACTION = 0x100
};
/**
* Given aFrame, the root frame of a stacking context, paint it and its
* descendants to aRenderingContext.
* @param aRenderingContext a rendering context translated so that (0,0)
* is the origin of aFrame; for best results, (0,0) should transform
* to pixel-aligned coordinates. This can be null, in which case
* aFrame must be a "display root" (root frame for a root document,
* or the root of a popup) with an associated widget and we draw using
* the layer manager for the frame's widget.
* @param aDirtyRegion the region that must be painted, in the coordinates
* of aFrame
* @param aBackstop paint the dirty area with this color before drawing
* the actual content; pass NS_RGBA(0,0,0,0) to draw no background
* @param aFlags if PAINT_IN_TRANSFORM is set, then we assume
* this is inside a transform or SVG foreignObject. If
* PAINT_SYNC_DECODE_IMAGES is set, we force synchronous decode on all
* images. If PAINT_WIDGET_LAYERS is set, aFrame must be a display root,
* and we will use the frame's widget's layer manager to paint
* even if aRenderingContext is non-null. This is useful if you want
* to force rendering to use the widget's layer manager for testing
* or speed. PAINT_WIDGET_LAYERS must be set if aRenderingContext is null.
* If PAINT_DOCUMENT_RELATIVE is used, the visible region is interpreted
* as being relative to the document. (Normally it's relative to the CSS
* viewport.) PAINT_TO_WINDOW sets painting to window to true on the display
* list builder even if we can't tell that we are painting to the window.
* If PAINT_EXISTING_TRANSACTION is set, then BeginTransaction() has already
* been called on aFrame's widget's layer manager and should not be
* called again.
*
* So there are three possible behaviours:
* 1) PAINT_WIDGET_LAYERS is set and aRenderingContext is null; we paint
* by calling BeginTransaction on the widget's layer manager
* 2) PAINT_WIDGET_LAYERS is set and aRenderingContext is non-null; we
* paint by calling BeginTransactionWithTarget on the widget's layer
* maanger
* 3) PAINT_WIDGET_LAYERS is not set and aRenderingContext is non-null;
* we paint by construct a BasicLayerManager and calling
* BeginTransactionWithTarget on it. This is desirable if we're doing
* something like drawWindow in a mode where what gets rendered doesn't
* necessarily correspond to what's visible in the window; we don't
* want to mess up the widget's layer tree.
*/
static nsresult PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackstop,
PRUint32 aFlags = 0);
/**
* Compute the used z-index of aFrame; returns zero for elements to which
* z-index does not apply, and for z-index:auto
*/
static PRInt32 GetZIndex(nsIFrame* aFrame);
/**
* Uses a binary search for find where the cursor falls in the line of text
* It also keeps track of the part of the string that has already been measured
* so it doesn't have to keep measuring the same text over and over
*
* @param "aBaseWidth" contains the width in twips of the portion
* of the text that has already been measured, and aBaseInx contains
* the index of the text that has already been measured.
*
* @param aTextWidth returns the (in twips) the length of the text that falls
* before the cursor aIndex contains the index of the text where the cursor falls
*/
static bool
BinarySearchForPosition(nsRenderingContext* acx,
const PRUnichar* aText,
PRInt32 aBaseWidth,
PRInt32 aBaseInx,
PRInt32 aStartInx,
PRInt32 aEndInx,
PRInt32 aCursorPos,
PRInt32& aIndex,
PRInt32& aTextWidth);
class BoxCallback {
public:
virtual void AddBox(nsIFrame* aFrame) = 0;
};
/**
* Collect all CSS boxes associated with aFrame and its
* continuations, "drilling down" through outer table frames and
* some anonymous blocks since they're not real CSS boxes.
* If aFrame is null, no boxes are returned.
* SVG frames return a single box, themselves.
*/
static void GetAllInFlowBoxes(nsIFrame* aFrame, BoxCallback* aCallback);
class RectCallback {
public:
virtual void AddRect(const nsRect& aRect) = 0;
};
struct RectAccumulator : public RectCallback {
nsRect mResultRect;
nsRect mFirstRect;
bool mSeenFirstRect;
RectAccumulator();
virtual void AddRect(const nsRect& aRect);
};
struct RectListBuilder : public RectCallback {
nsClientRectList* mRectList;
nsresult mRV;
RectListBuilder(nsClientRectList* aList);
virtual void AddRect(const nsRect& aRect);
};
static nsIFrame* GetContainingBlockForClientRect(nsIFrame* aFrame);
/**
* Collect all CSS border-boxes associated with aFrame and its
* continuations, "drilling down" through outer table frames and
* some anonymous blocks since they're not real CSS boxes.
* The boxes are positioned relative to aRelativeTo (taking scrolling
* into account) and passed to the callback in frame-tree order.
* If aFrame is null, no boxes are returned.
* For SVG frames, returns one rectangle, the bounding box.
*/
static void GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
RectCallback* aCallback);
/**
* Computes the union of all rects returned by GetAllInFlowRects. If
* the union is empty, returns the first rect.
*/
static nsRect GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo);
enum {
EXCLUDE_BLUR_SHADOWS = 0x01
};
/**
* Takes a text-shadow array from the style properties of a given nsIFrame and
* computes the union of those shadows along with the given initial rect.
* If there are no shadows, the initial rect is returned.
*/
static nsRect GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
nsIFrame* aFrame,
PRUint32 aFlags = 0);
/**
* Get the font metrics corresponding to the frame's style data.
* @param aFrame the frame
* @param aFontMetrics the font metrics result
* @return success or failure code
*/
static nsresult GetFontMetricsForFrame(const nsIFrame* aFrame,
nsFontMetrics** aFontMetrics);
/**
* Get the font metrics corresponding to the given style data.
* @param aStyleContext the style data
* @param aFontMetrics the font metrics result
* @return success or failure code
*/
static nsresult GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
nsFontMetrics** aFontMetrics);
/**
* Find the immediate child of aParent whose frame subtree contains
* aDescendantFrame. Returns null if aDescendantFrame is not a descendant
* of aParent.
*/
static nsIFrame* FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame);
/**
* Find the nearest ancestor that's a block
*/
static nsBlockFrame* FindNearestBlockAncestor(nsIFrame* aFrame);
/**
* Find the nearest ancestor that's not for generated content. Will return
* aFrame if aFrame is not for generated content.
*/
static nsIFrame* GetNonGeneratedAncestor(nsIFrame* aFrame);
/**
* Cast aFrame to an nsBlockFrame* or return null if it's not
* an nsBlockFrame.
*/
static nsBlockFrame* GetAsBlock(nsIFrame* aFrame);
/*
* Whether the frame is an nsBlockFrame which is not a wrapper block.
*/
static bool IsNonWrapperBlock(nsIFrame* aFrame) {
return GetAsBlock(aFrame) && !aFrame->IsBlockWrapper();
}
/**
* If aFrame is an out of flow frame, return its placeholder, otherwise
* return its parent.
*/
static nsIFrame* GetParentOrPlaceholderFor(nsFrameManager* aFrameManager,
nsIFrame* aFrame);
/**
* Get a frame's next-in-flow, or, if it doesn't have one, its special sibling.
*/
static nsIFrame*
GetNextContinuationOrSpecialSibling(nsIFrame *aFrame);
/**
* Get the first frame in the continuation-plus-special-sibling chain
* containing aFrame.
*/
static nsIFrame*
GetFirstContinuationOrSpecialSibling(nsIFrame *aFrame);
/**
* Check whether aFrame is a part of the scrollbar or scrollcorner of
* the root content.
* @param aFrame the checking frame
* @return if TRUE, the frame is a part of the scrollbar or scrollcorner of
* the root content.
*/
static bool IsViewportScrollbarFrame(nsIFrame* aFrame);
/**
* Get the contribution of aFrame to its containing block's intrinsic
* width. This considers the child's intrinsic width, its 'width',
* 'min-width', and 'max-width' properties, and its padding, border,
* and margin.
*/
enum IntrinsicWidthType { MIN_WIDTH, PREF_WIDTH };
static nscoord IntrinsicForContainer(nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
IntrinsicWidthType aType);
/*
* Convert nsStyleCoord to nscoord when percentages depend on the
* containing block width.
*/
static nscoord ComputeWidthDependentValue(
nscoord aContainingBlockWidth,
const nsStyleCoord& aCoord);
/*
* Convert nsStyleCoord to nscoord when percentages depend on the
* containing block width, and enumerated values are for width,
* min-width, or max-width. Returns the content-box width value based
* on aContentEdgeToBoxSizing and aBoxSizingToMarginEdge (which are
* also used for the enumerated values for width. This function does
* not handle 'auto'. It ensures that the result is nonnegative.
*
* @param aRenderingContext Rendering context for font measurement/metrics.
* @param aFrame Frame whose (min-/max-/)width is being computed
* @param aContainingBlockWidth Width of aFrame's containing block.
* @param aContentEdgeToBoxSizing The sum of any left/right padding and
* border that goes inside the rect chosen by -moz-box-sizing.
* @param aBoxSizingToMarginEdge The sum of any left/right padding, border,
* and margin that goes outside the rect chosen by -moz-box-sizing.
* @param aCoord The width value to compute.
*/
static nscoord ComputeWidthValue(
nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
nscoord aContainingBlockWidth,
nscoord aContentEdgeToBoxSizing,
nscoord aBoxSizingToMarginEdge,
const nsStyleCoord& aCoord);
/*
* Convert nsStyleCoord to nscoord when percentages depend on the
* containing block height.
*/
static nscoord ComputeHeightDependentValue(
nscoord aContainingBlockHeight,
const nsStyleCoord& aCoord);
/*
* Likewise, but for 'height', 'min-height', or 'max-height'.
*/
static nscoord ComputeHeightValue(nscoord aContainingBlockHeight,
const nsStyleCoord& aCoord)
{
nscoord result =
ComputeHeightDependentValue(aContainingBlockHeight, aCoord);
if (result < 0)
result = 0; // clamp calc()
return result;
}
static bool IsAutoHeight(const nsStyleCoord &aCoord, nscoord aCBHeight)
{
nsStyleUnit unit = aCoord.GetUnit();
return unit == eStyleUnit_Auto || // only for 'height'
unit == eStyleUnit_None || // only for 'max-height'
(aCBHeight == NS_AUTOHEIGHT && aCoord.HasPercent());
}
static bool IsPaddingZero(const nsStyleCoord &aCoord)
{
return (aCoord.GetUnit() == eStyleUnit_Coord &&
aCoord.GetCoordValue() == 0) ||
(aCoord.GetUnit() == eStyleUnit_Percent &&
aCoord.GetPercentValue() == 0.0f) ||
(aCoord.IsCalcUnit() &&
// clamp negative calc() to 0
nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) <= 0 &&
nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) <= 0);
}
static bool IsMarginZero(const nsStyleCoord &aCoord)
{
return (aCoord.GetUnit() == eStyleUnit_Coord &&
aCoord.GetCoordValue() == 0) ||
(aCoord.GetUnit() == eStyleUnit_Percent &&
aCoord.GetPercentValue() == 0.0f) ||
(aCoord.IsCalcUnit() &&
nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) == 0 &&
nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) == 0);
}
/*
* Calculate the used values for 'width' and 'height' for a replaced element.
*
* http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
*/
static nsSize ComputeSizeWithIntrinsicDimensions(
nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsIFrame::IntrinsicSize& aIntrinsicSize,
nsSize aIntrinsicRatio, nsSize aCBSize,
nsSize aMargin, nsSize aBorder, nsSize aPadding);
/*
* Calculate the used values for 'width' and 'height' when width
* and height are 'auto'. The tentWidth and tentHeight arguments should be
* the result of applying the rules for computing intrinsic sizes and ratios.
* as specified by CSS 2.1 sections 10.3.2 and 10.6.2
*/
static nsSize ComputeAutoSizeWithIntrinsicDimensions(nscoord minWidth, nscoord minHeight,
nscoord maxWidth, nscoord maxHeight,
nscoord tentWidth, nscoord tentHeight);
// Implement nsIFrame::GetPrefWidth in terms of nsIFrame::AddInlinePrefWidth
static nscoord PrefWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext);
// Implement nsIFrame::GetMinWidth in terms of nsIFrame::AddInlineMinWidth
static nscoord MinWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext);
// Get a suitable foreground color for painting aProperty for aFrame.
static nscolor GetColor(nsIFrame* aFrame, nsCSSProperty aProperty);
// Get a baseline y position in app units that is snapped to device pixels.
static gfxFloat GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
nscoord aY, nscoord aAscent);
static void DrawString(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const PRUnichar* aString,
PRInt32 aLength,
nsPoint aPoint,
PRUint8 aDirection = NS_STYLE_DIRECTION_INHERIT);
static nscoord GetStringWidth(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const PRUnichar* aString,
PRInt32 aLength);
/**
* Helper function for drawing text-shadow. The callback's job
* is to draw whatever needs to be blurred onto the given context.
*/
typedef void (* TextShadowCallback)(nsRenderingContext* aCtx,
nsPoint aShadowOffset,
const nscolor& aShadowColor,
void* aData);
static void PaintTextShadow(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const nsRect& aTextRect,
const nsRect& aDirtyRect,
const nscolor& aForegroundColor,
TextShadowCallback aCallback,
void* aCallbackData);
/**
* Gets the baseline to vertically center text from a font within a
* line of specified height.
*
* Returns the baseline position relative to the top of the line.
*/
static nscoord GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
nscoord aLineHeight);
/**
* Derive a baseline of |aFrame| (measured from its top border edge)
* from its first in-flow line box (not descending into anything with
* 'overflow' not 'visible', potentially including aFrame itself).
*
* Returns true if a baseline was found (and fills in aResult).
* Otherwise returns false.
*/
static bool GetFirstLineBaseline(const nsIFrame* aFrame, nscoord* aResult);
/**
* Just like GetFirstLineBaseline, except also returns the top and
* bottom of the line with the baseline.
*
* Returns true if a line was found (and fills in aResult).
* Otherwise returns false.
*/
struct LinePosition {
nscoord mTop, mBaseline, mBottom;
LinePosition operator+(nscoord aOffset) const {
LinePosition result;
result.mTop = mTop + aOffset;
result.mBaseline = mBaseline + aOffset;
result.mBottom = mBottom + aOffset;
return result;
}
};
static bool GetFirstLinePosition(const nsIFrame* aFrame,
LinePosition* aResult);
/**
* Derive a baseline of |aFrame| (measured from its top border edge)
* from its last in-flow line box (not descending into anything with
* 'overflow' not 'visible', potentially including aFrame itself).
*
* Returns true if a baseline was found (and fills in aResult).
* Otherwise returns false.
*/
static bool GetLastLineBaseline(const nsIFrame* aFrame, nscoord* aResult);
/**
* Returns a y coordinate relative to this frame's origin that represents
* the logical bottom of the frame or its visible content, whichever is lower.
* Relative positioning is ignored and margins and glyph bounds are not
* considered.
* This value will be >= mRect.height() and <= overflowRect.YMost() unless
* relative positioning is applied.
*/
static nscoord CalculateContentBottom(nsIFrame* aFrame);
/**
* Gets the closest frame (the frame passed in or one of its parents) that
* qualifies as a "layer"; used in DOM0 methods that depends upon that
* definition. This is the nearest frame that is either positioned or scrolled
* (the child of a scroll frame).
*/
static nsIFrame* GetClosestLayer(nsIFrame* aFrame);
/**
* Gets the graphics filter for the frame
*/
static GraphicsFilter GetGraphicsFilterForFrame(nsIFrame* aFrame);
/* N.B. The only difference between variants of the Draw*Image
* functions below is the type of the aImage argument.
*/
/**
* Draw a background image. The image's dimensions are as specified in aDest;
* the image itself is not consulted to determine a size.
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
* @param aRenderingContext Where to draw the image, set up with an
* appropriate scale and transform for drawing in
* app units.
* @param aImage The image.
* @param aImageSize The unscaled size of the image being drawn.
* (This might be the image's size if no scaling
* occurs, or it might be the image's size if
* the image is a vector image being rendered at
* that size.)
* @param aDest The position and scaled area where one copy of
* the image should be drawn.
* @param aFill The area to be filled with copies of the
* image.
* @param aAnchor A point in aFill which we will ensure is
* pixel-aligned in the output.
* @param aDirty Pixels outside this area may be skipped.
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety
*/
static nsresult DrawBackgroundImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
const nsIntSize& aImageSize,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
PRUint32 aImageFlags);
/**
* Draw an image.
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
* @param aRenderingContext Where to draw the image, set up with an
* appropriate scale and transform for drawing in
* app units.
* @param aImage The image.
* @param aDest Where one copy of the image should mapped to.
* @param aFill The area to be filled with copies of the
* image.
* @param aAnchor A point in aFill which we will ensure is
* pixel-aligned in the output.
* @param aDirty Pixels outside this area may be skipped.
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety
*/
static nsresult DrawImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
PRUint32 aImageFlags);
/**
* Convert an nsRect to a gfxRect.
*/
static gfxRect RectToGfxRect(const nsRect& aRect,
PRInt32 aAppUnitsPerDevPixel);
/**
* Draw a drawable using the pixel snapping algorithm.
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
* @param aRenderingContext Where to draw the image, set up with an
* appropriate scale and transform for drawing in
* app units.
* @param aDrawable The drawable we want to draw.
* @param aFilter The graphics filter we should draw with.
* @param aDest Where one copy of the image should mapped to.
* @param aFill The area to be filled with copies of the
* image.
* @param aAnchor A point in aFill which we will ensure is
* pixel-aligned in the output.
* @param aDirty Pixels outside this area may be skipped.
*/
static void DrawPixelSnapped(nsRenderingContext* aRenderingContext,
gfxDrawable* aDrawable,
GraphicsFilter aFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty);
/**
* Draw a whole image without scaling or tiling.
*
* @param aRenderingContext Where to draw the image, set up with an
* appropriate scale and transform for drawing in
* app units.
* @param aImage The image.
* @param aDest The top-left where the image should be drawn
* @param aDirty If non-null, then pixels outside this area may
* be skipped.
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety
* @param aSourceArea If non-null, this area is extracted from
* the image and drawn at aDest. It's
* in appunits. For best results it should
* be aligned with image pixels.
*/
static nsresult DrawSingleUnscaledImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsPoint& aDest,
const nsRect* aDirty,
PRUint32 aImageFlags,
const nsRect* aSourceArea = nsnull);
/**
* Draw a whole image without tiling.
*
* @param aRenderingContext Where to draw the image, set up with an
* appropriate scale and transform for drawing in
* app units.
* @param aImage The image.
* @param aDest The area that the image should fill
* @param aDirty Pixels outside this area may be skipped.
* @param aSourceArea If non-null, this area is extracted from
* the image and drawn in aDest. It's
* in appunits. For best results it should
* be aligned with image pixels.
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety
*/
static nsresult DrawSingleImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aDirty,
PRUint32 aImageFlags,
const nsRect* aSourceArea = nsnull);
/**
* Given an imgIContainer, this method attempts to obtain an intrinsic
* px-valued height & width for it. If the imgIContainer has a non-pixel
* value for either height or width, this method tries to generate a pixel
* value for that dimension using the intrinsic ratio (if available). The
* intrinsic ratio will be assigned to aIntrinsicRatio; if there's no
* intrinsic ratio then (0, 0) will be assigned.
*
* This method will always set aGotWidth and aGotHeight to indicate whether
* we were able to successfully obtain (or compute) a value for each
* dimension.
*
* NOTE: This method is similar to ComputeSizeWithIntrinsicDimensions. The
* difference is that this one is simpler and is suited to places where we
* have less information about the frame tree.
*/
static void ComputeSizeForDrawing(imgIContainer* aImage,
nsIntSize& aImageSize,
nsSize& aIntrinsicRatio,
bool& aGotWidth,
bool& aGotHeight);
/**
* Given a source area of an image (in appunits) and a destination area
* that we want to map that source area too, computes the area that
* would be covered by the whole image. This is useful for passing to
* the aDest parameter of DrawImage, when we want to draw a subimage
* of an overall image.
*/
static nsRect GetWholeImageDestination(const nsIntSize& aWholeImageSize,
const nsRect& aImageSourceArea,
const nsRect& aDestArea);
/**
* Determine if any corner radius is of nonzero size
* @param aCorners the |nsStyleCorners| object to check
* @return true unless all the coordinates are 0%, 0 or null.
*
* A corner radius with one dimension zero and one nonzero is
* treated as a nonzero-radius corner, even though it will end up
* being rendered like a zero-radius corner. This is because such
* corners are not expected to appear outside of test cases, and it's
* simpler to implement the test this way.
*/
static bool HasNonZeroCorner(const nsStyleCorners& aCorners);
/**
* Determine if there is any corner radius on corners adjacent to the
* given side.
*/
static bool HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
mozilla::css::Side aSide);
/**
* Determine if a widget is likely to require transparency or translucency.
* @param aBackgroundFrame The frame that the background is set on. For
* <window>s, this will be the canvas frame.
* @param aCSSRootFrame The frame that holds CSS properties affecting
* the widget's transparency. For menupopups,
* aBackgroundFrame and aCSSRootFrame will be the
* same.
* @return a value suitable for passing to SetWindowTranslucency
*/
static nsTransparencyMode GetFrameTransparency(nsIFrame* aBackgroundFrame,
nsIFrame* aCSSRootFrame);
/**
* A frame is a popup if it has its own floating window. Menus, panels
* and combobox dropdowns are popups.
*/
static bool IsPopup(nsIFrame* aFrame);
/**
* Find the nearest "display root". This is the nearest enclosing
* popup frame or the root prescontext's root frame.
*/
static nsIFrame* GetDisplayRootFrame(nsIFrame* aFrame);
/**
* Get textrun construction flags determined by a given style; in particular
* some combination of:
* -- TEXT_DISABLE_OPTIONAL_LIGATURES if letter-spacing is in use
* -- TEXT_OPTIMIZE_SPEED if the text-rendering CSS property and font size
* and prefs indicate we should be optimizing for speed over quality
*/
static PRUint32 GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
const nsStyleText* aStyleText,
const nsStyleFont* aStyleFont);
/**
* Takes two rectangles whose origins must be the same, and computes
* the difference between their union and their intersection as two
* rectangles. (This difference is a superset of the difference
* between the two rectangles.)
*/
static void GetRectDifferenceStrips(const nsRect& aR1, const nsRect& aR2,
nsRect* aHStrip, nsRect* aVStrip);
/**
* Get a device context that can be used to get up-to-date device
* dimensions for the given docshell. For some reason, this is more
* complicated than it ought to be in multi-monitor situations.
*/
static nsDeviceContext*
GetDeviceContextForScreenInfo(nsIDocShell* aDocShell);
/**
* Some frames with 'position: fixed' (nsStylePosition::mDisplay ==
* NS_STYLE_POSITION_FIXED) are not really fixed positioned, since
* they're inside an element with -moz-transform. This function says
* whether such an element is a real fixed-pos element.
*/
static bool IsReallyFixedPos(nsIFrame* aFrame);
/**
* Return true if aFrame is in an {ib} split and is NOT one of the
* continuations of the first inline in it.
*/
static bool FrameIsNonFirstInIBSplit(const nsIFrame* aFrame) {
return (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) &&
aFrame->GetFirstContinuation()->
Properties().Get(nsIFrame::IBSplitSpecialPrevSibling());
}
/**
* Return true if aFrame is in an {ib} split and is NOT one of the
* continuations of the last inline in it.
*/
static bool FrameIsNonLastInIBSplit(const nsIFrame* aFrame) {
return (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) &&
aFrame->GetFirstContinuation()->
Properties().Get(nsIFrame::IBSplitSpecialSibling());
}
/**
* Obtain a gfxASurface from the given DOM element, if possible.
* This obtains the most natural surface from the element; that
* is, the one that can be obtained with the fewest conversions.
*
* The flags below can modify the behaviour of this function. The
* result is returned as a SurfaceFromElementResult struct, also
* defined below.
*
* Currently, this will do:
* - HTML Canvas elements: will return the underlying canvas surface
* - HTML Video elements: will return the current video frame
* - Image elements: will return the image
*
* The above results are modified by the below flags (copying,
* forcing image surface, etc.).
*/
enum {
/* Always create a new surface for the result */
SFE_WANT_NEW_SURFACE = 1 << 0,
/* When creating a new surface, create an image surface */
SFE_WANT_IMAGE_SURFACE = 1 << 1,
/* Whether to extract the first frame (as opposed to the
current frame) in the case that the element is an image. */
SFE_WANT_FIRST_FRAME = 1 << 2,
/* Whether we should skip colorspace/gamma conversion */
SFE_NO_COLORSPACE_CONVERSION = 1 << 3,
/* Whether we should skip premultiplication -- the resulting
image will always be an image surface, and must not be given to
Thebes for compositing! */
SFE_NO_PREMULTIPLY_ALPHA = 1 << 4
};
struct SurfaceFromElementResult {
SurfaceFromElementResult() :
// Use safe default values here
mIsWriteOnly(true), mIsStillLoading(false), mCORSUsed(false) {}
/* mSurface will contain the resulting surface, or will be NULL on error */
nsRefPtr<gfxASurface> mSurface;
/* The size of the surface */
gfxIntSize mSize;
/* The principal associated with the element whose surface was returned.
If there is a surface, this will never be null. */
nsCOMPtr<nsIPrincipal> mPrincipal;
/* The image request, if the element is an nsIImageLoadingContent */
nsCOMPtr<imgIRequest> mImageRequest;
/* Whether the element was "write only", that is, the bits should not be exposed to content */
bool mIsWriteOnly;
/* Whether the element was still loading. Some consumers need to handle
this case specially. */
bool mIsStillLoading;
/* Whether the element used CORS when loading. */
bool mCORSUsed;
};
static SurfaceFromElementResult SurfaceFromElement(nsIDOMElement *aElement,
PRUint32 aSurfaceFlags = 0);
/**
* When the document is editable by contenteditable attribute of its root
* content or body content.
*
* Be aware, this returns NULL if it's in designMode.
*
* For example:
*
* <html contenteditable="true"><body></body></html>
* returns the <html>.
*
* <html><body contenteditable="true"></body></html>
* <body contenteditable="true"></body>
* With these cases, this returns the <body>.
* NOTE: The latter case isn't created normally, however, it can be
* created by script with XHTML.
*
* <body><p contenteditable="true"></p></body>
* returns NULL because <body> isn't editable.
*/
static nsIContent*
GetEditableRootContentByContentEditable(nsIDocument* aDocument);
/**
* Returns true if the passed in prescontext needs the dark grey background
* that goes behind the page of a print preview presentation.
*/
static bool NeedsPrintPreviewBackground(nsPresContext* aPresContext) {
return aPresContext->IsRootPaginatedDocument() &&
(aPresContext->Type() == nsPresContext::eContext_PrintPreview ||
aPresContext->Type() == nsPresContext::eContext_PageLayout);
}
/**
* Adds all font faces used in the frame tree starting from aFrame
* to the list aFontFaceList.
*/
static nsresult GetFontFacesForFrames(nsIFrame* aFrame,
nsFontFaceList* aFontFaceList);
/**
* Adds all font faces used within the specified range of text in aFrame,
* and optionally its continuations, to the list in aFontFaceList.
* Pass 0 and PR_INT32_MAX for aStartOffset and aEndOffset to specify the
* entire text is to be considered.
*/
static nsresult GetFontFacesForText(nsIFrame* aFrame,
PRInt32 aStartOffset,
PRInt32 aEndOffset,
bool aFollowContinuations,
nsFontFaceList* aFontFaceList);
/**
* Walks the frame tree starting at aFrame looking for textRuns.
* If aTotal is NULL, just clears the TEXT_RUN_MEMORY_ACCOUNTED flag
* on each textRun found.
* If aTotal is non-NULL, adds the storage used for each textRun to the
* total, and sets the TEXT_RUN_MEMORY_ACCOUNTED flag to avoid double-
* accounting. (Runs with this flag already set will be skipped.)
* Expected usage pattern is therefore to call twice:
* rv = GetTextRunMemoryForFrames(rootFrame, NULL);
* rv = GetTextRunMemoryForFrames(rootFrame, &total);
*/
static nsresult GetTextRunMemoryForFrames(nsIFrame* aFrame,
PRUint64* aTotal);
/**
* Checks if CSS 3D transforms are currently enabled.
*/
static bool Are3DTransformsEnabled();
/**
* Return whether this is a frame whose width is used when computing
* the font size inflation of its descendants.
*/
static bool IsContainerForFontSizeInflation(const nsIFrame *aFrame);
/**
* Return the font size inflation *ratio* for a given frame. This is
* the factor by which font sizes should be inflated; it is never
* smaller than 1.
*
* There are three variants: pass a reflow state if the frame or any
* of its ancestors are currently being reflowed and a frame
* otherwise, or, if you know the width of the inflation container (a
* somewhat sketchy assumption), its width.
*/
static float FontSizeInflationFor(const nsHTMLReflowState &aReflowState);
static float FontSizeInflationFor(const nsIFrame *aFrame);
static float FontSizeInflationFor(const nsIFrame *aFrame,
nscoord aInflationContainerWidth);
/**
* Perform the first half of the computation of FontSizeInflationFor
* (see above).
* This includes determining whether inflation should be performed
* within this container and returning 0 if it should not be.
*
* The result is guaranteed not to vary between line participants
* (inlines, text frames) within a line.
*
* The result should not be used directly since font sizes slightly
* above the minimum should always be adjusted as done by
* FontSizeInflationInner.
*/
static nscoord InflationMinFontSizeFor(const nsHTMLReflowState
&aReflowState);
static nscoord InflationMinFontSizeFor(const nsIFrame *aFrame);
static nscoord InflationMinFontSizeFor(const nsIFrame *aFrame,
nscoord aInflationContainerWidth);
/**
* Perform the second half of the computation done by
* FontSizeInflationFor (see above).
*
* aMinFontSize must be the result of one of the
* InflationMinFontSizeFor methods above.
*/
static float FontSizeInflationInner(const nsIFrame *aFrame,
nscoord aMinFontSize);
static bool FontSizeInflationEnabled(nsPresContext *aPresContext);
static void Initialize();
static void Shutdown();
/**
* Register an imgIRequest object with a refresh driver.
*
* @param aPresContext The nsPresContext whose refresh driver we want to
* register with.
* @param aRequest A pointer to the imgIRequest object which the client wants
* to register with the refresh driver.
* @param aRequestRegistered A pointer to a boolean value which indicates
* whether the given image request is registered. If
* *aRequestRegistered is true, then this request will not be
* registered again. If the request is registered by this function,
* then *aRequestRegistered will be set to true upon the completion of
* this function.
*
*/
static void RegisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered);
/**
* Register an imgIRequest object with a refresh driver, but only if the
* request is for an image that is animated.
*
* @param aPresContext The nsPresContext whose refresh driver we want to
* register with.
* @param aRequest A pointer to the imgIRequest object which the client wants
* to register with the refresh driver.
* @param aRequestRegistered A pointer to a boolean value which indicates
* whether the given image request is registered. If
* *aRequestRegistered is true, then this request will not be
* registered again. If the request is registered by this function,
* then *aRequestRegistered will be set to true upon the completion of
* this function.
*
*/
static void RegisterImageRequestIfAnimated(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered);
/**
* Deregister an imgIRequest object from a refresh driver.
*
* @param aPresContext The nsPresContext whose refresh driver we want to
* deregister from.
* @param aRequest A pointer to the imgIRequest object with which the client
* previously registered and now wants to deregister from the refresh
* driver.
* @param aRequestRegistered A pointer to a boolean value which indicates
* whether the given image request is registered. If
* *aRequestRegistered is false, then this request will not be
* deregistered. If the request is deregistered by this function,
* then *aRequestRegistered will be set to false upon the completion of
* this function.
*/
static void DeregisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered);
#ifdef DEBUG
/**
* Assert that there are no duplicate continuations of the same frame
* within aFrameList. Optimize the tests by assuming that all frames
* in aFrameList have parent aContainer.
*/
static void
AssertNoDuplicateContinuations(nsIFrame* aContainer,
const nsFrameList& aFrameList);
/**
* Assert that the frame tree rooted at |aSubtreeRoot| is empty, i.e.,
* that it contains no first-in-flows.
*/
static void
AssertTreeOnlyEmptyNextInFlows(nsIFrame *aSubtreeRoot);
#endif
};
class nsSetAttrRunnable : public nsRunnable
{
public:
nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
const nsAString& aValue);
nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
PRInt32 aValue);
NS_DECL_NSIRUNNABLE
nsCOMPtr<nsIContent> mContent;
nsCOMPtr<nsIAtom> mAttrName;
nsAutoString mValue;
};
class nsUnsetAttrRunnable : public nsRunnable
{
public:
nsUnsetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName);
NS_DECL_NSIRUNNABLE
nsCOMPtr<nsIContent> mContent;
nsCOMPtr<nsIAtom> mAttrName;
};
class nsReflowFrameRunnable : public nsRunnable
{
public:
nsReflowFrameRunnable(nsIFrame* aFrame,
nsIPresShell::IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd);
NS_DECL_NSIRUNNABLE
nsWeakFrame mWeakFrame;
nsIPresShell::IntrinsicDirty mIntrinsicDirty;
nsFrameState mBitToAdd;
};
#endif // nsLayoutUtils_h__
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