11/27/2022 0 Comments Gdi directdrawIn particular, the ref rasterizer forces the use of the reference Direct3D rasterizer from Microsoft. By default, the best rasterizer is chosen based on its advertised capabilities. See the Direct3D documentation for a description of these rasterizers. Set the J2D_D3D_RASTERIZER environment variable to one of the following: ref, rgb, hal, or tnl. With the Java SE 8 release, some rendering issues (like missing pixels, garbled rendering) can be diagnosed by forcing different Direct3D rasterizers. To defeat the built-in surface punting mechanism, provide the following flag to the Java VM: =true. The DirectDraw pipeline provides a way to disable the punting mechanism so that the system memory surfaces are not used. On certain video boards/drivers combinations, the system-memory-based DirectDraw surfaces are known to cause rendering artifacts and other issues. In some cases, his means that the pixels of the destination surface, which resides in VRAM, must be read into system memory, which is a very expensive operation. However, if the pipeline cannot perform an operation using the DirectDraw API (operations using, for example, alpha compositing, or transforms, or antialiasing), then endering is performed using the software pipeline. If the surface is found to be copied from often enough, it may be promoted back to video memory. To limit the effect of unaccelerated rendering to VRAM-based surfaces, there exists a punting mechanism, which moves the surface that is detected to be often read from to the system memory. In general, the DirectDraw pipeline attempts to place the offscreen surfaces in the framebuffer's video memory, which provides the fast copies from these surfaces to the screen or other accelerated surfaces, as well as hardware accelerated rendering of certain graphics operations. These operations could result in extremely poor performance, especially if the X server is remote. In most cases, this includes reading the contents of the pixmap to system memory (over the network in the case of remote X server), performing the rendering, and then sending the pixels back to the pixmap. These cases typically involve the use of operations that cannot be performed using the X protocol, such as antialiasing, alpha compositing, and transforms that are more complex than simple translation transforms.įor these operations, the X11 pipeline must do the rendering using the built-in software renderer. However, in certain cases, the opposite is true. The use of pixmaps typically results in better performance. The advantage of using pixmaps for storing images is that they can be put into the framebuffer's video memory at the driver's discretion, which improves the speed at which these pixmaps can be copied to the screen or another pixmap. Opaque images, in which case ColorModel.getTransparency() returns Transparency.OPAQUEġ-bit transparent images (also known as sprites, Transparency.BITMASK) Only the following types of images can be stored in pixmaps: OpenGL Pipeline in Oracle Solaris, Linux, and Windowsis an alternative on the Oracle Solaris and Linux operating systems, as well as Windows. Windows OS - Direct3D Pipeline in Full-Screen Mode is an alternative on Windows. Windows OS - DirectDraw/GDI Pipeline is the default on Windows Oracle Solaris and Linux: X11 Pipelineis the default for the Oracle Solaris and Linux operating systems. Java 2D uses a set of pipelines, which can be roughly defined as different ways of rendering the primitives. If the problem persists, then try changing another property or pipeline. If the problem disappears, then you found a workaround. Then, either change the pipeline to another one, or modify the properties of the default pipeline. In general, you can troubleshoot Java 2D pipeline issues by determining the default pipeline used in your configuration. This chapter provides information and guidance for troubleshooting some of the most common issues that might be found in the Java 2D API when changing pipeline rendering and properties.įor a summary of Java 2D properties, see Java 2D Properties.īy choosing a different pipeline, or manipulating the properties of a pipeline, you might be able to determine the cause of the problem, and often find a workaround.
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