Class IFSerializer
- java.lang.Object
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- org.apache.fop.render.intermediate.AbstractIFDocumentHandler
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- org.apache.fop.render.intermediate.AbstractXMLWritingIFDocumentHandler
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- org.apache.fop.render.intermediate.IFSerializer
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- All Implemented Interfaces:
IFConstants
,IFDocumentHandler
,IFDocumentNavigationHandler
,IFPainter
,XMLConstants
public class IFSerializer extends AbstractXMLWritingIFDocumentHandler implements IFConstants, IFPainter, IFDocumentNavigationHandler
IFPainter implementation that serializes the intermediate format to XML.
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Field Summary
Fields Modifier and Type Field Description static java.lang.String
VERSION
Intermediate Format (IF) version, used to express an @version attribute in the root element of the IF document, the initial value of which is set to '2.0' to signify that something preceded it (but didn't happen to be marked as such), and that this version is not necessarily backwards compatible with the unmarked (<2.0) version.-
Fields inherited from class org.apache.fop.render.intermediate.AbstractXMLWritingIFDocumentHandler
handler, tFactory
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Fields inherited from interface org.apache.fop.render.intermediate.IFConstants
EL_BORDER_RECT, EL_CLIP_RECT, EL_DOCUMENT, EL_FONT, EL_GROUP, EL_HEADER, EL_ID, EL_IMAGE, EL_LINE, EL_LOCALE, EL_PAGE, EL_PAGE_CONTENT, EL_PAGE_HEADER, EL_PAGE_SEQUENCE, EL_PAGE_TRAILER, EL_RECT, EL_STRUCTURE_TREE, EL_TEXT, EL_TRAILER, EL_VIEWPORT, MIME_TYPE, NAMESPACE
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Fields inherited from interface org.apache.fop.util.XMLConstants
CDATA, XLINK_HREF, XLINK_NAMESPACE, XLINK_PREFIX, XML_NAMESPACE, XML_PREFIX, XML_SPACE, XMLNS_NAMESPACE_URI, XMLNS_PREFIX
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Constructor Summary
Constructors Constructor Description IFSerializer(IFContext context)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addResolvedAction(AbstractAction action)
void
clipBackground(java.awt.Rectangle rect, BorderProps bpsBefore, BorderProps bpsAfter, BorderProps bpsStart, BorderProps bpsEnd)
Restricts the current clipping region to the inner border.void
clipRect(java.awt.Rectangle rect)
Restricts the current clipping region with the given rectangle.protected RenderingContext
createRenderingContext()
void
drawBorderRect(java.awt.Rectangle rect, BorderProps top, BorderProps bottom, BorderProps left, BorderProps right, java.awt.Color innerBackgroundColor)
Draws a border rectangle.void
drawImage(java.lang.String uri, java.awt.Rectangle rect)
Draws an image identified by a URI inside a given rectangle.void
drawImage(org.w3c.dom.Document doc, java.awt.Rectangle rect)
Draws an image (represented by a DOM document) inside a given rectangle.void
drawLine(java.awt.Point start, java.awt.Point end, int width, java.awt.Color color, RuleStyle style)
Draws a line.void
drawText(int x, int y, int letterSpacing, int wordSpacing, int[][] dp, java.lang.String text)
Draws text.void
endDocument()
Indicates the end of a document.void
endDocumentHeader()
Indicates the end of the document header.void
endDocumentTrailer()
Indicates the end of the document trailer.void
endGroup()
Ends the current group and restores the previous coordinate system (and layer).void
endPage()
Indicates the end of a pagevoid
endPageContent()
Indicates the end of the page content.void
endPageHeader()
Indicates the end of the page header.void
endPageSequence()
Indicates the end of a page sequence.void
endPageTrailer()
Indicates the end of the page trailer.void
endViewport()
Ends the current viewport and restores the previous coordinate system.void
fillRect(java.awt.Rectangle rect, java.awt.Paint fill)
Fills a rectangular area.IFDocumentHandlerConfigurator
getConfigurator()
Returns the configurator for this document handler, if any.IFDocumentNavigationHandler
getDocumentNavigationHandler()
Returns a document navigation handler if this feature is supported.FontInfo
getFontInfo()
Returns the font set to work with.protected java.lang.String
getMainNamespace()
Returns the main namespace used for generated XML content.java.lang.String
getMimeType()
Returns the MIME type of the output format that is generated by this implementation.IFDocumentHandler
getMimickedDocumentHandler()
Returns the document handler that is being mimicked by this serializer.int
getPageIndex()
StructureTreeEventHandler
getStructureTreeEventHandler()
void
handleExtensionObject(java.lang.Object extension)
Handles an extension object.boolean
isBackgroundRequired(BorderProps bpsTop, BorderProps bpsBottom, BorderProps bpsLeft, BorderProps bpsRight)
TODO Painter-specific rounded borders logic required background drawing to be made optional.void
mimicDocumentHandler(IFDocumentHandler targetHandler)
Tells this serializer to mimic the given document handler (mostly applies to the font set that is used during layout).void
renderBookmarkTree(BookmarkTree tree)
Render the bookmark tree.void
renderLink(Link link)
void
renderNamedDestination(NamedDestination destination)
Renders a named destination.void
setDefaultFontInfo(FontInfo fontInfo)
Sets the default font set (with no custom configuration).void
setDocumentLocale(java.util.Locale locale)
void
setFont(java.lang.String family, java.lang.String style, java.lang.Integer weight, java.lang.String variant, java.lang.Integer size, java.awt.Color color)
Updates the current font.void
setFontInfo(FontInfo fontInfo)
Sets the font set to work with.void
startDocument()
Indicates the start of a document.void
startDocumentHeader()
Indicates the start of the document header.void
startDocumentTrailer()
Indicates the start of the document trailer.void
startGroup(java.awt.geom.AffineTransform[] transforms, java.lang.String layer)
Starts a new group of graphical elements.void
startGroup(java.awt.geom.AffineTransform transform, java.lang.String layer)
Starts a new group of graphical elements.void
startPage(int index, java.lang.String name, java.lang.String pageMasterName, java.awt.Dimension size)
Indicates the start of a new page.IFPainter
startPageContent()
Indicates the start of the page content.void
startPageHeader()
Indicates the start of the page header.void
startPageSequence(java.lang.String id)
Indicates the start of a new page sequence.void
startPageTrailer()
Indicates the start of the page trailer.void
startViewport(java.awt.geom.AffineTransform[] transforms, java.awt.Dimension size, java.awt.Rectangle clipRect)
Starts a new viewport, establishing a new coordinate system.void
startViewport(java.awt.geom.AffineTransform transform, java.awt.Dimension size, java.awt.Rectangle clipRect)
Starts a new viewport, establishing a new coordinate system.boolean
supportsPagesOutOfOrder()
Indicates whether the painter supports to handle the pages in mixed order rather than ascending order.-
Methods inherited from class org.apache.fop.render.intermediate.AbstractXMLWritingIFDocumentHandler
createContentHandler, setResult
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Methods inherited from class org.apache.fop.render.intermediate.AbstractIFDocumentHandler
getContext, getUserAgent
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Field Detail
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VERSION
public static final java.lang.String VERSION
Intermediate Format (IF) version, used to express an @version attribute in the root element of the IF document, the initial value of which is set to '2.0' to signify that something preceded it (but didn't happen to be marked as such), and that this version is not necessarily backwards compatible with the unmarked (<2.0) version.- See Also:
- Constant Field Values
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Constructor Detail
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IFSerializer
public IFSerializer(IFContext context)
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Method Detail
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getMainNamespace
protected java.lang.String getMainNamespace()
Returns the main namespace used for generated XML content.- Specified by:
getMainNamespace
in classAbstractXMLWritingIFDocumentHandler
- Returns:
- the main namespace
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supportsPagesOutOfOrder
public boolean supportsPagesOutOfOrder()
Indicates whether the painter supports to handle the pages in mixed order rather than ascending order.- Specified by:
supportsPagesOutOfOrder
in interfaceIFDocumentHandler
- Returns:
- true if out-of-order handling is supported
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getMimeType
public java.lang.String getMimeType()
Returns the MIME type of the output format that is generated by this implementation.- Specified by:
getMimeType
in interfaceIFDocumentHandler
- Returns:
- the MIME type
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getConfigurator
public IFDocumentHandlerConfigurator getConfigurator()
Returns the configurator for this document handler, if any.- Specified by:
getConfigurator
in interfaceIFDocumentHandler
- Returns:
- the configurator or null if there's no configurator
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getDocumentNavigationHandler
public IFDocumentNavigationHandler getDocumentNavigationHandler()
Returns a document navigation handler if this feature is supported.- Specified by:
getDocumentNavigationHandler
in interfaceIFDocumentHandler
- Overrides:
getDocumentNavigationHandler
in classAbstractIFDocumentHandler
- Returns:
- the document navigation handler or null if not supported
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mimicDocumentHandler
public void mimicDocumentHandler(IFDocumentHandler targetHandler)
Tells this serializer to mimic the given document handler (mostly applies to the font set that is used during layout).- Parameters:
targetHandler
- the document handler to mimic
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getMimickedDocumentHandler
public IFDocumentHandler getMimickedDocumentHandler()
Returns the document handler that is being mimicked by this serializer.- Returns:
- the mimicked document handler or null if no such document handler has been set
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getFontInfo
public FontInfo getFontInfo()
Returns the font set to work with.- Specified by:
getFontInfo
in interfaceIFDocumentHandler
- Returns:
- the font info object
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setFontInfo
public void setFontInfo(FontInfo fontInfo)
Sets the font set to work with.- Specified by:
setFontInfo
in interfaceIFDocumentHandler
- Parameters:
fontInfo
- the font info object
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setDefaultFontInfo
public void setDefaultFontInfo(FontInfo fontInfo)
Sets the default font set (with no custom configuration).- Specified by:
setDefaultFontInfo
in interfaceIFDocumentHandler
- Parameters:
fontInfo
- the font info object to populate
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getStructureTreeEventHandler
public StructureTreeEventHandler getStructureTreeEventHandler()
Description copied from class:AbstractIFDocumentHandler
- Specified by:
getStructureTreeEventHandler
in interfaceIFDocumentHandler
- Overrides:
getStructureTreeEventHandler
in classAbstractIFDocumentHandler
- Returns:
- the structure tree builder
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startDocument
public void startDocument() throws IFException
Indicates the start of a document. This method may only be called once before any other event method.- Specified by:
startDocument
in interfaceIFDocumentHandler
- Overrides:
startDocument
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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setDocumentLocale
public void setDocumentLocale(java.util.Locale locale)
Description copied from class:AbstractIFDocumentHandler
- Specified by:
setDocumentLocale
in interfaceIFDocumentHandler
- Overrides:
setDocumentLocale
in classAbstractIFDocumentHandler
- Parameters:
locale
- Locale of the document.
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startDocumentHeader
public void startDocumentHeader() throws IFException
Indicates the start of the document header. This method is called right after theIFDocumentHandler.startDocument()
method. Extensions sent to this painter betweenIFDocumentHandler.startDocumentHeader()
andIFDocumentHandler.endDocumentHeader()
apply to the document as a whole (like document metadata).- Specified by:
startDocumentHeader
in interfaceIFDocumentHandler
- Overrides:
startDocumentHeader
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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endDocumentHeader
public void endDocumentHeader() throws IFException
Indicates the end of the document header. This method is called before the first page sequence.- Specified by:
endDocumentHeader
in interfaceIFDocumentHandler
- Overrides:
endDocumentHeader
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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startDocumentTrailer
public void startDocumentTrailer() throws IFException
Indicates the start of the document trailer. This method is called after the last page sequence. Extensions sent to the painter betweenIFDocumentHandler.startDocumentTrailer()
andIFDocumentHandler.endDocumentTrailer()
apply to the document as a whole and is used for document-level content that is only known after all pages have been rendered (like named destinations or the bookmark tree).- Specified by:
startDocumentTrailer
in interfaceIFDocumentHandler
- Overrides:
startDocumentTrailer
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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endDocumentTrailer
public void endDocumentTrailer() throws IFException
Indicates the end of the document trailer. This method is called right before theIFDocumentHandler.endDocument()
method.- Specified by:
endDocumentTrailer
in interfaceIFDocumentHandler
- Overrides:
endDocumentTrailer
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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endDocument
public void endDocument() throws IFException
Indicates the end of a document. This method may only be called once after the whole document has been handled. Implementations can release resources (close streams). It is an error to call any event method after this method.- Specified by:
endDocument
in interfaceIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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startPageSequence
public void startPageSequence(java.lang.String id) throws IFException
Indicates the start of a new page sequence.- Specified by:
startPageSequence
in interfaceIFDocumentHandler
- Parameters:
id
- the page sequence's identifier (or null if none is available)- Throws:
IFException
- if an error occurs while handling this event
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endPageSequence
public void endPageSequence() throws IFException
Indicates the end of a page sequence.- Specified by:
endPageSequence
in interfaceIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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startPage
public void startPage(int index, java.lang.String name, java.lang.String pageMasterName, java.awt.Dimension size) throws IFException
Indicates the start of a new page.- Specified by:
startPage
in interfaceIFDocumentHandler
- Parameters:
index
- the index of the page (0-based)name
- the page name (usually the formatted page number)pageMasterName
- the name of the simple-page-master that generated this pagesize
- the size of the page (equivalent to the MediaBox in PDF)- Throws:
IFException
- if an error occurs while handling this event
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startPageHeader
public void startPageHeader() throws IFException
Indicates the start of the page header.- Specified by:
startPageHeader
in interfaceIFDocumentHandler
- Overrides:
startPageHeader
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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endPageHeader
public void endPageHeader() throws IFException
Indicates the end of the page header.- Specified by:
endPageHeader
in interfaceIFDocumentHandler
- Overrides:
endPageHeader
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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startPageContent
public IFPainter startPageContent() throws IFException
Indicates the start of the page content. The method returns anIFPainter
interface which is used to paint the page contents.- Specified by:
startPageContent
in interfaceIFDocumentHandler
- Returns:
- the IFPainter for the page content
- Throws:
IFException
- if an error occurs while handling this event
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endPageContent
public void endPageContent() throws IFException
Indicates the end of the page content. Calls to theIFPainter
returned by the respectiveIFDocumentHandler.startPageContent()
method are illegal.- Specified by:
endPageContent
in interfaceIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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startPageTrailer
public void startPageTrailer() throws IFException
Indicates the start of the page trailer. The page trailer is used for writing down page elements which are only know after handling the page itself (like PDF targets).- Specified by:
startPageTrailer
in interfaceIFDocumentHandler
- Overrides:
startPageTrailer
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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endPageTrailer
public void endPageTrailer() throws IFException
Indicates the end of the page trailer.- Specified by:
endPageTrailer
in interfaceIFDocumentHandler
- Overrides:
endPageTrailer
in classAbstractIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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endPage
public void endPage() throws IFException
Indicates the end of a page- Specified by:
endPage
in interfaceIFDocumentHandler
- Throws:
IFException
- if an error occurs while handling this event
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startViewport
public void startViewport(java.awt.geom.AffineTransform transform, java.awt.Dimension size, java.awt.Rectangle clipRect) throws IFException
Starts a new viewport, establishing a new coordinate system. A viewport has a size and can optionally be clipped. Corresponds to SVG's svg element.- Specified by:
startViewport
in interfaceIFPainter
- Parameters:
transform
- the transformation matrix establishing the new coordinate systemsize
- the size of the viewportclipRect
- the clipping rectangle (may be null)- Throws:
IFException
- if an error occurs while handling this element
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startViewport
public void startViewport(java.awt.geom.AffineTransform[] transforms, java.awt.Dimension size, java.awt.Rectangle clipRect) throws IFException
Starts a new viewport, establishing a new coordinate system. A viewport has a size and can optionally be clipped. Corresponds to SVG's svg element.- Specified by:
startViewport
in interfaceIFPainter
- Parameters:
transforms
- a series of transformation matrices establishing the new coordinate systemsize
- the size of the viewportclipRect
- the clipping rectangle (may be null)- Throws:
IFException
- if an error occurs while handling this element
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endViewport
public void endViewport() throws IFException
Ends the current viewport and restores the previous coordinate system.- Specified by:
endViewport
in interfaceIFPainter
- Throws:
IFException
- if an error occurs while handling this element
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startGroup
public void startGroup(java.awt.geom.AffineTransform[] transforms, java.lang.String layer) throws IFException
Starts a new group of graphical elements. Corresponds to SVG's g element.- Specified by:
startGroup
in interfaceIFPainter
- Parameters:
transforms
- a series of transformation matrices establishing the new coordinate systemlayer
- an optional layer label (or null if none)- Throws:
IFException
- if an error occurs while handling this element
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startGroup
public void startGroup(java.awt.geom.AffineTransform transform, java.lang.String layer) throws IFException
Starts a new group of graphical elements. Corresponds to SVG's g element.- Specified by:
startGroup
in interfaceIFPainter
- Parameters:
transform
- the transformation matrix establishing the new coordinate systemlayer
- an optional layer label (or null if none)- Throws:
IFException
- if an error occurs while handling this element
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endGroup
public void endGroup() throws IFException
Ends the current group and restores the previous coordinate system (and layer).- Specified by:
endGroup
in interfaceIFPainter
- Throws:
IFException
- if an error occurs while handling this element
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drawImage
public void drawImage(java.lang.String uri, java.awt.Rectangle rect) throws IFException
Draws an image identified by a URI inside a given rectangle. This is the equivalent to an fo:external-graphic in XSL-FO.- Specified by:
drawImage
in interfaceIFPainter
- Parameters:
uri
- the image's URIrect
- the rectangle in which the image shall be painted- Throws:
IFException
- if an error occurs while handling this event
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drawImage
public void drawImage(org.w3c.dom.Document doc, java.awt.Rectangle rect) throws IFException
Draws an image (represented by a DOM document) inside a given rectangle. This is the equivalent to an fo:instream-foreign-object in XSL-FO.- Specified by:
drawImage
in interfaceIFPainter
- Parameters:
doc
- the DOM document containing the foreign objectrect
- the rectangle in which the image shall be painted- Throws:
IFException
- if an error occurs while handling this event
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clipRect
public void clipRect(java.awt.Rectangle rect) throws IFException
Restricts the current clipping region with the given rectangle.- Specified by:
clipRect
in interfaceIFPainter
- Parameters:
rect
- the rectangle's coordinates and extent- Throws:
IFException
- if an error occurs while handling this event
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clipBackground
public void clipBackground(java.awt.Rectangle rect, BorderProps bpsBefore, BorderProps bpsAfter, BorderProps bpsStart, BorderProps bpsEnd) throws IFException
Restricts the current clipping region to the inner border.- Specified by:
clipBackground
in interfaceIFPainter
- Parameters:
rect
- the rectangle's coordinates and extentbpsBefore
- the border segment on the before-side (top)bpsAfter
- the border segment on the after-side (bottom)bpsStart
- the border segment on the start-side (left)bpsEnd
- the border segment on the end-side (right)- Throws:
IFException
- if an error occurs while handling this event
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fillRect
public void fillRect(java.awt.Rectangle rect, java.awt.Paint fill) throws IFException
Fills a rectangular area.- Specified by:
fillRect
in interfaceIFPainter
- Parameters:
rect
- the rectangle's coordinates and extentfill
- the fill paint- Throws:
IFException
- if an error occurs while handling this event
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drawBorderRect
public void drawBorderRect(java.awt.Rectangle rect, BorderProps top, BorderProps bottom, BorderProps left, BorderProps right, java.awt.Color innerBackgroundColor) throws IFException
Draws a border rectangle. The border segments are specified throughBorderProps
instances.- Specified by:
drawBorderRect
in interfaceIFPainter
- Parameters:
rect
- the rectangle's coordinates and extenttop
- the border segment on the top edgebottom
- the border segment on the bottom edgeleft
- the border segment on the left edgeright
- the border segment on the right edgeinnerBackgroundColor
- the color of the inner background- Throws:
IFException
- if an error occurs while handling this event
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drawLine
public void drawLine(java.awt.Point start, java.awt.Point end, int width, java.awt.Color color, RuleStyle style) throws IFException
Draws a line. NOTE: Currently, only horizontal lines are implemented!- Specified by:
drawLine
in interfaceIFPainter
- Parameters:
start
- the start point of the lineend
- the end point of the linewidth
- the line widthcolor
- the line colorstyle
- the line style (using the Constants.EN_* constants for the rule-style property)- Throws:
IFException
- if an error occurs while handling this event
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drawText
public void drawText(int x, int y, int letterSpacing, int wordSpacing, int[][] dp, java.lang.String text) throws IFException
Draws text. The initial coordinates (x and y) point to the starting point at the normal baseline of the font. The parameters letterSpacing, wordSpacing and the array dx are optional and can be used to influence character positioning (for example, for kerning).- Specified by:
drawText
in interfaceIFPainter
- Parameters:
x
- X-coordinate of the starting point of the texty
- Y-coordinate of the starting point of the textletterSpacing
- additional spacing between characters (may be 0)wordSpacing
- additional spacing between words (may be 0)dp
- an array of 4-tuples, expressing [X,Y] placment adjustments and [X,Y] advancement adjustments, in that order (may be null); if not null, then adjustments.length must be the same as text.length()text
- the text- Throws:
IFException
- if an error occurs while handling this event
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setFont
public void setFont(java.lang.String family, java.lang.String style, java.lang.Integer weight, java.lang.String variant, java.lang.Integer size, java.awt.Color color) throws IFException
Updates the current font.- Specified by:
setFont
in interfaceIFPainter
- Parameters:
family
- the font family (or null if there's no change)style
- the font style (or null if there's no change)weight
- the font weight (or null if there's no change)variant
- the font variant (or null if there's no change)size
- the font size (or null if there's no change)color
- the text color (or null if there's no change)- Throws:
IFException
- if an error occurs while handling this event
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handleExtensionObject
public void handleExtensionObject(java.lang.Object extension) throws IFException
Handles an extension object. This can be a DOM document or any arbitrary object. If an implementation doesn't know how to handle a particular extension it is simply ignored.- Specified by:
handleExtensionObject
in interfaceIFDocumentHandler
- Parameters:
extension
- the extension object- Throws:
IFException
- if an error occurs while handling this event
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createRenderingContext
protected RenderingContext createRenderingContext() throws java.lang.IllegalStateException
- Returns:
- a new rendering context
- Throws:
java.lang.IllegalStateException
- unless overridden
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renderNamedDestination
public void renderNamedDestination(NamedDestination destination) throws IFException
Renders a named destination.- Specified by:
renderNamedDestination
in interfaceIFDocumentNavigationHandler
- Parameters:
destination
- the named destination- Throws:
IFException
- if an error occurs while handling this event
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renderBookmarkTree
public void renderBookmarkTree(BookmarkTree tree) throws IFException
Render the bookmark tree.- Specified by:
renderBookmarkTree
in interfaceIFDocumentNavigationHandler
- Parameters:
tree
- the bookmark tree- Throws:
IFException
- if an error occurs while handling this event
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renderLink
public void renderLink(Link link) throws IFException
- Specified by:
renderLink
in interfaceIFDocumentNavigationHandler
- Parameters:
link
- a link- Throws:
IFException
- of not caught
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addResolvedAction
public void addResolvedAction(AbstractAction action) throws IFException
- Specified by:
addResolvedAction
in interfaceIFDocumentNavigationHandler
- Parameters:
action
- an action- Throws:
IFException
- of not caught
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getPageIndex
public int getPageIndex()
- Specified by:
getPageIndex
in interfaceIFDocumentNavigationHandler
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isBackgroundRequired
public boolean isBackgroundRequired(BorderProps bpsTop, BorderProps bpsBottom, BorderProps bpsLeft, BorderProps bpsRight)
TODO Painter-specific rounded borders logic required background drawing to be made optional. A future refactoring of the rounded borders code should aim to make the need for this abstraction obsolete- Specified by:
isBackgroundRequired
in interfaceIFPainter
- Parameters:
bpsTop
- the before borderbpsBottom
- the after borderbpsLeft
- the start borderbpsRight
- the end border- Returns:
- true if and only if background drawing is required
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