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+<?xml version="1.0" encoding="UTF-8" ?>

+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"

+                   "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">

+

+<!-- lifted from troff+ms+XMan by doclifter -->

+<book id="shapelib">

+

+<bookinfo>

+   <title>X Nonrectangular Window Shape Extension Library</title>

+   <subtitle>X Consortium Standard</subtitle>

+   <releaseinfo>X Version 11, Release 6.4</releaseinfo>

+   <authorgroup>

+      <author>

+         <firstname>Keith</firstname><surname>Packard</surname>

+      </author>

+   </authorgroup>

+   <corpname>MIT X Consortium</corpname>

+   <copyright><year>1989</year><holder>X Consortium</holder></copyright>

+   <releaseinfo>Version 1.0</releaseinfo>

+   <affiliation><orgname>MIT X Consortium</orgname></affiliation>

+   <productnumber>X Version 11, Release 6.4</productnumber>

+

+<legalnotice>

+

+<para>

+Permission is hereby granted, free of charge, to any person obtaining a copy

+of this software and associated documentation files

+(the &ldquo;Software&rdquo;), to deal in the Software without restriction,

+including without limitation the rights to use, copy, modify, merge,

+publish, distribute, sublicense, and/or sell copies of the Software, and

+to permit persons to whom the Software is furnished to do so, subject to

+the following conditions:

+</para>

+

+<para>

+The above copyright notice and this permission notice shall be included in

+all copies or substantial portions of the Software.

+</para>

+

+<para>

+THE SOFTWARE IS PROVIDED &ldquo;AS IS&rdquo;, WITHOUT WARRANTY OF ANY

+KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

+IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR

+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

+OTHER DEALINGS IN THE SOFTWARE.

+</para>

+

+<para>

+Except as contained in this notice, the name of the X Consortium shall not be

+used in advertising or otherwise to promote the sale, use or other dealings

+in this Software without prior written authorization from the X Consortium.

+</para>

+</legalnotice>

+</bookinfo>

+

+<chapter id='overview'>

+<title>Overview</title>

+

+<para>This extension provides arbitrary window and border shapes within

+the X11 protocol.

+</para>

+

+<para>

+The restriction of rectangular windows within the X protocol is a significant

+limitation in the implementation of many styles of user interface.  For

+example, many transient windows would like to display a

+&ldquo;drop shadow&rdquo; to give the illusion of 3 dimensions.  As

+another example, some user interface style guides call for buttons with

+rounded corners; the full simulation of a nonrectangular shape,

+particularly with respect to event distribution and cursor shape, is not

+possible within the core X protocol.  As a final example, round clocks

+and nonrectangular icons are desirable visual addition to the desktop.

+</para>

+

+<para>

+This extension provides mechanisms for changing the visible shape of a

+window to an arbitrary, possibly disjoint, nonrectangular form.  The intent

+of the extension is to supplement the existing semantics, not replace them.

+In particular, it is desirable for clients that are unaware of the

+extension to still be able to cope reasonably with shaped windows.  For

+example, window managers should still be able to negotiate screen

+real estate in rectangular pieces.  Toward this end, any shape specified for

+a window is clipped by the bounding rectangle for the window as specified by

+the window's geometry in the core protocol.  An expected convention would be

+that client programs expand their shape to fill the area offered by the

+window manager.

+</para>

+</chapter>

+

+<chapter id='description'>

+<title>Description</title>

+

+<para>

+Each window (even with no shapes specified) is defined by two regions:  the

+<emphasis remap='I'>bounding region</emphasis> and the

+<emphasis remap='I'>clip region</emphasis>.  The bounding region is the

+area of the parent window that the window will occupy (including border).

+The clip region is the subset of the bounding region that is available for

+subwindows and graphics.  The area between the bounding region and the

+clip region is defined to be the border of the window.

+</para>

+

+<para>

+A nonshaped window will have a bounding region that is a rectangle spanning

+the window, including its border; the clip region will be a rectangle

+filling the inside dimensions (not including the border).  In this document,

+these areas are referred to as the

+<emphasis remap='I'>default bounding region</emphasis> and the

+<emphasis remap='I'>default clip region</emphasis>.  For a window with

+inside size of <emphasis remap='I'>width</emphasis> by

+<emphasis remap='I'>height</emphasis> and border width

+<emphasis remap='I'>bwidth</emphasis>, the default bounding and clip

+regions are the rectangles (relative to the window origin):

+</para>

+

+<literallayout remap='Ds'>

+bounding.x = -<emphasis remap='I'>bwidth</emphasis>

+bounding.y = -<emphasis remap='I'>bwidth</emphasis>

+bounding.width = <emphasis remap='I'>width</emphasis> + 2 * <emphasis remap='I'>bwidth</emphasis>

+bounding.height = <emphasis remap='I'>height</emphasis> + 2 * <emphasis remap='I'>bwidth</emphasis>

+

+clip.x = 0

+clip.y = 0

+clip.width = <emphasis remap='I'>width</emphasis>

+clip.height = <emphasis remap='I'>height</emphasis>

+</literallayout>

+

+<para>

+This extension allows a client to modify either or both of the bounding or

+clip regions by specifying new regions that combine with the default

+regions.  These new regions are called the

+<emphasis remap='I'>client bounding region</emphasis> and the

+<emphasis remap='I'>client clip region</emphasis>.  They are specified

+relative to the origin of the window and are always defined by offsets

+relative to the window origin (that is, region adjustments are not

+required when the window is moved).  Three mechanisms for specifying

+regions are provided:  a list of rectangles, a bitmap, and an existing

+bounding or clip region from a window.  This is modeled on the specification

+of regions in graphics contexts in the core protocol and allows a variety

+of different uses of the extension.

+</para>

+

+<para>

+When using an existing window shape as an operand in specifying a new shape,

+the client region is used, unless none has been set, in which case the

+default region is used instead.

+</para>

+

+<para>

+The <emphasis remap='I'>effective bounding region</emphasis> of a window is

+defined to be the intersection of the client bounding region with the default

+bounding region.  Any portion of the client bounding region that is not

+included in the default bounding region will not be included in the

+effective bounding region on the screen.  This means that window managers

+(or other geometry managers) used to dealing with rectangular client windows

+will be able to constrain the client to a rectangular area of the screen.

+</para>

+

+<para>

+Construction of the effective bounding region is dynamic; the client bounding

+region is not mutated to obtain the effective bounding region.  If a client

+bounding region is specified that extends beyond the current default bounding

+region, and the window is later enlarged, the effective bounding region will

+be enlarged to include more of the client bounding region.

+</para>

+

+<para>

+The <emphasis remap='I'>effective clip region</emphasis> of a window is

+defined to be the intersection of the client clip region with both the

+default clip region and the client bounding region.  Any portion of the

+client clip region that is not included in both the default clip region

+and the client bounding region will not be included in the effective clip

+region on the screen.

+</para>

+

+<para>

+Construction of the effective clip region is dynamic; the client clip region is

+not mutated to obtain the effective clip region.  If a client clip region is

+specified that extends beyond the current default clip region and the

+window or its bounding region is later enlarged, the effective clip region will

+be enlarged to include more of the client clip region if it is included in

+the effective bounding region.

+</para>

+

+<para>

+The border of a window is defined to be the difference between the effective

+bounding region and the effective clip region.  If this region is empty, no

+border is displayed.  If this region is nonempty, the border is filled

+using the border-tile or border-pixel of the window as specified in the core

+protocol.  Note that a window with a nonzero border width will never be able

+to draw beyond the default clip region of the window.  Also note that a zero

+border width does not prevent a window from having a border, since the clip

+shape can still be made smaller than the bounding shape.

+</para>

+

+<para>

+All output to the window and visible regions of any subwindows will be

+clipped to the effective clip region.  The server must not retain window

+contents beyond the effective bounding region with backing store.  The window's

+origin (for graphics operations, background tiling, and subwindow placement)

+is not affected by the existence of a bounding region or clip region.

+</para>

+

+<para>

+Areas that are inside the default bounding region but outside the effective

+bounding region are not part of the window; these areas of the screen will

+be occupied by other windows.  Input events that occur within the default

+bounding region but outside the effective bounding region will be delivered as

+if the window was not occluding the event position.  Events that occur in

+a nonrectangular border of a window will be delivered to that window, just

+as for events that occur in a normal rectangular border.

+</para>

+

+<para>An

+<function>InputOnly</function>

+window can have its bounding region set, but it is a

+<function>Match</function>

+error to attempt to set a clip region on an

+<function>InputOnly</function>

+window or to specify its clip region as a source to a request

+in this extension.

+</para>

+

+<para>

+The server must accept changes to the clip region of a root window, but

+the server is permitted to ignore requested changes to the bounding region

+of a root window.  If the server accepts bounding region changes, the contents

+of the screen outside the bounding region are implementation dependent.

+</para>

+</chapter>

+

+<chapter id='c_language_binding'>

+<title>C Language Binding</title>

+

+<para>

+The C functions provide direct access to the protocol and add no additional

+semantics.

+</para>

+

+<para>The include file for this extension is

+&lt;<symbol role='Pn'>X11/extensions/shape.h</symbol>&gt;.

+The defined shape kinds are

+<function>ShapeBounding</function>

+and

+<function>ShapeClip</function>

+The defined region operations are

+<function>ShapeSet</function>

+<function>ShapeUnion</function>

+<function>ShapeIntersect</function>

+<function>ShapeSubtract</function>

+and

+<function>ShapeInvert</function>.</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef>Bool<function> XShapeQueryExtension</function></funcdef>

+<paramdef>Display <parameter>*display</parameter></paramdef>

+<paramdef>int <parameter>*event_base</parameter></paramdef>

+<paramdef>int <parameter>*error_base</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+<function>XShapeQueryExtension</function>

+returns

+<function>True</function>

+if the specified display supports the SHAPE extension else

+<function>False</function>

+If the extension is supported, *event_base is set to the event number for

+<function>ShapeNotify</function>

+events and *error_base would be set to the error number for the first error for

+this extension.  Because no errors are defined for this version of

+the extension, the value returned here is not defined (nor useful).

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef>Status<function> XShapeQueryVersion</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>int<parameter> *major_version</parameter></paramdef>

+<paramdef>int<parameter> *minor_version</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is supported,

+<function>XShapeQueryVersion</function>

+sets the major and minor version numbers of the

+extension supported by the display and returns a nonzero value.

+Otherwise, the arguments are not set and zero is returned.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef><function>XShapeCombineRegion</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> dest</parameter></paramdef>

+<paramdef>int<parameter> dest_kind</parameter></paramdef>

+<paramdef>int<parameter> x_off</parameter></paramdef>

+<paramdef>int<parameter> y_off</parameter></paramdef>

+<paramdef>int<parameter> region</parameter></paramdef>

+<paramdef>int<parameter> op</parameter></paramdef>

+<paramdef>REGION<parameter> *region</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+<function>XShapeCombineRegion</function>

+converts the specified region into a list of rectangles and calls

+<function>XShapeCombineRectangles</function>

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef><function>XShapeCombineRectangles</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> dest</parameter></paramdef>

+<paramdef>int<parameter> dest_kind</parameter></paramdef>

+<paramdef>int<parameter> x_off</parameter></paramdef>

+<paramdef>int<parameter> y_off</parameter></paramdef>

+<paramdef>XRectangle<parameter> *rectangles</parameter></paramdef>

+<paramdef>int<parameter> n_rects</parameter></paramdef>

+<paramdef>int<parameter> op</parameter></paramdef>

+<paramdef>int<parameter> ordering</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is supported,

+<function>XShapeCombineRectangles</function>

+performs a

+<function>ShapeRectangles</function>

+operation; otherwise, the request is ignored.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef><function>XShapeCombineMask</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>int<parameter> dest</parameter></paramdef>

+<paramdef>int<parameter> dest_kind</parameter></paramdef>

+<paramdef>int<parameter> x_off</parameter></paramdef>

+<paramdef>int<parameter> y_off</parameter></paramdef>

+<paramdef>Pixmap<parameter> src</parameter></paramdef>

+<paramdef>int<parameter> op</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is supported,

+<function>XShapeCombineMask</function>

+performs a

+<function>ShapeMask</function>

+operation; otherwise, the request is ignored.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef><function>XShapeCombineShape</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> dest</parameter></paramdef>

+<paramdef>int<parameter> dest_kind</parameter></paramdef>

+<paramdef>int<parameter> x_off</parameter></paramdef>

+<paramdef>int<parameter> y_off</parameter></paramdef>

+<paramdef>Window<parameter> src</parameter></paramdef>

+<paramdef>int<parameter> src_kind</parameter></paramdef>

+<paramdef>int<parameter> op</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is supported,

+<function>XShapeCombineShape</function>

+performs a

+<function>ShapeCombine</function>

+operation; otherwise, the request is ignored.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef><function>XShapeOffsetShape</function></funcdef>

+<paramdef><parameter>display</parameter></paramdef>

+<paramdef><parameter>dest</parameter></paramdef>

+<paramdef><parameter>dest_kind</parameter></paramdef>

+<paramdef><parameter>x_off</parameter></paramdef>

+<paramdef><parameter>y_off</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is supported,

+<function>XShapeOffsetShape</function>

+performs a

+<function>ShapeOffset</function>

+operation; otherwise, the request is ignored.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef>Status <function>XShapeQueryExtents</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> window</parameter></paramdef>

+<paramdef>Bool<parameter> *bounding_shaped</parameter></paramdef>

+<paramdef>int<parameter> *x_bounding</parameter></paramdef>

+<paramdef>int<parameter> *y_bounding</parameter></paramdef>

+<paramdef>unsigned int<parameter> *w_bounding</parameter></paramdef>

+<paramdef>unsigned int<parameter> *h_bounding</parameter></paramdef>

+<paramdef>Bool<parameter> *clip_shaped</parameter></paramdef>

+<paramdef>int<parameter> *x_clip</parameter></paramdef>

+<paramdef>int<parameter> *y_clip</parameter></paramdef>

+<paramdef>unsigned int<parameter> *w_clip</parameter></paramdef>

+<paramdef>unsigned int<parameter> *h_clip</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is supported,

+<function>XShapeQueryExtents</function>

+sets x_bounding, y_bounding, w_bounding, h_bounding to the extents of the

+bounding shape and sets x_clip, y_clip, w_clip, h_clip to the extents of

+the clip shape.  For unspecified client regions, the extents of the

+corresponding default region are used.

+</para>

+

+<para>

+If the extension is supported, a nonzero value is returned; otherwise,

+zero is returned.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef><function>XShapeSelectInput</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> window</parameter></paramdef>

+<paramdef>unsigned long<parameter> mask</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+To make this extension more compatible with other interfaces, although

+only one event type can be selected via the extension,

+<function>XShapeSelectInput</function>

+provides a general mechanism similar to the standard Xlib binding for

+window events.  A mask value has been defined,

+<function>ShapeNotifyMask</function>

+that is the only valid bit in mask that may be specified.

+The structure for this event is defined as follows:

+</para>

+

+<literallayout remap='Ds'>

+typedef struct {

+    int type;     /* of event */

+    unsigned long serial;     /* # of last request processed by server */

+    Bool send_event;     /* true if this came frome a SendEvent request */

+    Display *display;     /* Display the event was read from */

+    Window window;     /* window of event */

+    int kind;     /* ShapeBounding or ShapeClip */

+    int x, y;     /* extents of new region */

+    unsigned width, height;

+    Time time;     /* server timestamp when region changed */

+    Bool shaped;     /* true if the region exists */

+} XShapeEvent;

+</literallayout>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef>unsigned long <function>XShapeInputSelected</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> window</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+<function>XShapeInputSelected</function>

+returns the current input mask for extension events on the specified

+window; the value returned if

+<function>ShapeNotify</function>

+is selected for is

+<function>ShapeNotifyMask</function>

+otherwise, it returns zero.

+If the extension is not supported, it returns zero.

+</para>

+

+<funcsynopsis>

+<funcprototype>

+<funcdef>XRectangle<function> *XShapeGetRectangles</function></funcdef>

+<paramdef>Display<parameter> *display</parameter></paramdef>

+<paramdef>Window<parameter> window</parameter></paramdef>

+<paramdef>int<parameter> kind</parameter></paramdef>

+<paramdef>int<parameter> *count</parameter></paramdef>

+<paramdef>int<parameter> *ordering</parameter></paramdef>

+</funcprototype>

+</funcsynopsis>

+

+<para>

+If the extension is not supported,

+<function>XShapeGetRectangles</function>

+returns NULL.  Otherwise, it returns a list of rectangles that describe the

+region specified by kind.

+</para>

+</chapter>

+

+<glossary id='glossary'>

+

+<glossdiv>

+<title>Glossary</title>

+<glossentry id='bounding_region'>

+  <glossterm>bounding region</glossterm>

+  <glossdef><para>The area of the parent window that this window will occupy.

+This area is divided into two parts:  the border and the interior.</para>

+  </glossdef>

+</glossentry>

+

+<glossentry id='clip_region'>

+  <glossterm>clip region</glossterm>

+  <glossdef><para>The interior of the window, as a subset of the bounding

+region.  This region describes the area that will be painted with the

+window background when the window is cleared, will contain all graphics

+output to the window, and will clip any subwindows.</para></glossdef>

+</glossentry>

+

+<glossentry id='default_bounding_region'>

+  <glossterm>default bounding region</glossterm>

+  <glossdef><para>The rectangular area, as described by the core protocol

+window size, that covers the interior of the window and its border.</para>

+  </glossdef>

+</glossentry>

+

+<glossentry id='default_clip_region'>

+  <glossterm>default clip region</glossterm>

+  <glossdef><para>The rectangular area, as described by the core protocol

+window size, that covers the interior of the window and excludes the border.

+  </para></glossdef>

+</glossentry>

+

+<glossentry id='client_bounding_region'>

+  <glossterm>client bounding region</glossterm>

+  <glossdef><para>The region associated with a window that is directly

+modified via this extension when specified by

+<function>ShapeBounding</function>

+This region is used in conjunction with the default bounding region

+to produce the effective bounding region.</para></glossdef>

+</glossentry>

+

+<glossentry id='client_clip_region'>

+  <glossterm>client clip region</glossterm>

+  <glossdef><para>The region associated with a window that is directly

+modified via this extension when specified by

+<function>ShapeClip</function>

+This region is used in conjunction with the default clip region

+and the client bounding region to produce the effective clip region.</para>

+  </glossdef>

+</glossentry>

+

+<glossentry id='effective_bounding_region'>

+  <glossterm>effective bounding region</glossterm>

+  <glossdef><para>The actual shape of the window on the screen, including

+border and interior (but excluding the effects of overlapping windows).

+When a window has a client bounding region, the effective bounding region

+is the intersection of the default bounding region and the client bounding

+region.  Otherwise, the effective bounding region is the same as the

+default bounding region.</para>

+  </glossdef>

+</glossentry>

+

+<glossentry id='effective_clip_region'>

+  <glossterm>effective clip region</glossterm>

+  <glossdef><para>The actual shape of the interior of the window on the

+screen (excluding the effects of overlapping windows).  When a window

+has a client clip region or a client bounding region, the effective

+clip region is the intersection of the default clip region, the client

+clip region (if any) and the client bounding region (if any).  Otherwise,

+the effective clip region is the same as the default clip region.</para>

+  </glossdef>

+</glossentry>

+

+</glossdiv>

+</glossary>

+</book>