JavaScript is required to for searching.
Skip Navigation Links
Exit Print View
Solaris X Window System Developer's Guide
search filter icon
search icon

Document Information


1.  Introduction to the Solaris X Server

2.  DPS Features and Enhancements

3.  Visuals on the Solaris X Server

4.  Font Support

5.  Server Overlay Windows

6.  Transparent Overlay Windows

What are Transparent Overlay Windows?

Basic Characteristics of Transparent Overlay Windows

Paint Type


More on Transparent Overlay Characteristics


Window Border

Backing Store

Window Gravity


Input Distribution Model

Print Capture

Choosing Visuals for Overlay/Underlay Windows

Example Program

Overview of the Solaris Transparent Overlay Window API

Creating Transparent Overlay Windows

Setting the Paint Type of a Graphics Context

Setting the Background State of a Transparent Overlay Window

Rendering to a Transparent Overlay Window

Querying the Characteristics of a Transparent Overlay Window

Determining Whether a Window is an Overlay Window

Determining the Paint Type of a Graphics Context

Pixel Transfer Routines

Filling an Area Using the Source Area Paint Type

Copying an Area and Its Paint Type

Retrieving Overlay Color Information

Using Existing Xlib Pixel Transfer Routines


XCopyArea and XCopyPlane

Designing an Application for Portability

Selecting a Visual for an Overlay/Underlay Window

Argument Types

Return Types

Multiple Criteria Sets

Selecting an Optimal Overlay/Underlay Visual Pair

Argument Types

Return Types

Criteria Sets

7.  Security Issues

A.  Reference Display Devices



Rendering to a Transparent Overlay Window

Once a transparent overlay window is created, you can use all the standard Xlib primitive rendering routines, such as XDrawLines and XFillRectangles, to draw into the window. When drawing to transparent overlay windows, the paint type attribute of the GC is used to control the quality of the pixels rendered. The paint type attribute applies to both the foreground and background GC attributes. To set the paint type, use the XSolarisOvlSetPaintType routine; for information on this routine, see Setting the Paint Type of a Graphics Context.

The paint type of the GC also controls the type of pixels rendered with XPutImage. If the paint type of the argument GC is XSolarisOvlPaintOpaque, the color information from the source image is used and the pixels are rendered with opaque paint. However, if the paint type is XSolarisOvlPaintTransparent, the source color information is ignored, and the pixels are rendered with transparent paint.

If a GC with a paint type of XSolarisOvlPaintTransparent is used to render to a drawable other than a transparent overlay window, such as an underlay window or pixmap, the GC paint type is ignored, and the pixels are rendered with opaque paint.