CPU SPEED ACCELERATOR FOR WINDOWS 7 DRIVERS
CPU SPEED ACCELERATOR FOR WINDOWS 7 DRIVER
CPU SPEED ACCELERATOR FOR WINDOWS 7 CODE
CPU SPEED ACCELERATOR FOR WINDOWS 7 WINDOWS 7

CPU SPEED ACCELERATOR FOR WINDOWS 7 DRIVER

Parts of the driver need to respond to events such as power management events. In Windows XP, a display driver exists in two different address spaces: session space and kernel space. Difficulty in synchronizing session and global kernel address spaces As can be seen in the figure above, the display driver is divided into a complex user mode component and a simpler kernel mode component.

CPU SPEED ACCELERATOR FOR WINDOWS 7 CODE

More complex code tends to have more defects making it beneficial for the driver to exist in user-mode where a driver bug can't cause a system reboot.

CPU SPEED ACCELERATOR FOR WINDOWS 7 DRIVERS

Increasing complexity and size of display driversģD drivers have become more complex over time.

There were also a number of additional factors that caused changes to the GDI driver model, as explained below. The following illustration shows how GDI display rendering has changed from Windows XP to Windows 7. This set the stage for a sequence of changes to how GDI renders to the display.

As a consequence the BitBlt API was hardware accelerated and most other GDI operations were not. Over time, more and more emphasis was placed on 3D game acceleration and less on application acceleration. When the GDI DDI was first defined, most display acceleration hardware targeted the GDI primitives. The Direct3D driver model corresponds to what the 3D rendering hardware in a GPU renders. Direct2D is layered on top Direct3D and GDI has its own driver model, the GDI Device Driver Interface (DDI), which corresponds to the GDI primitives. The most important difference between Direct2D and GDI hardware acceleration is the underlying technology that drives them. Direct2D, however, runs in user mode and passes drawing commands through the user mode Direct3D driver to the kernel mode driver. Starting with Windows 2000, GDI and the GDI drivers have run in an independent space in the kernel called 'session space.' A session address space is created for each logon session, and each instance of GDI runs independently in this distinct kernel mode address space. This driver then sends the results to the global kernel mode display driver. The application calls GDI which then calls its kernel mode counterpart which passes the primitives to its own driver model. Since Windows NT 4, GDI has run in kernel mode. Because Direct2D is built with this emphasis on 3D acceleration it is also easy to use with Direct3D. Direct2D is not a pure superset of GDI: primitives that would have been unreasonably slow when implemented on a GPU aren't present in Direct2D. Direct2D makes it easier to create a modern UI because it has strict guarantees on how it accepts and renders transparent content, and all of its primitives are rendered using hardware acceleration. Modern UIs often make use of transparency and animation. For example, Direct2D's aliased lines are designed to be implemented simply as two triangles rendered on the GPU, whereas GDI uses Bresenham's line drawing algorithm.ĭirect2D renders opaque, transparent, aliased and anti-aliased primitives. More importantly, GDI's rendering does not map easily to 3D operations, and a modern GPU renders most efficiently on the 3D portion of its rendering engine. Few GDI APIs guarantee what the alpha channel will contain after an operation. However, its handling of transparency is inconsistent and most GDI APIs simply ignore the alpha channel. It renders aliased and ClearType text, and it can support transparency blending through the AlphaBlend API.

GDI renders opaque, aliased geometries such as polygons, ellipses and lines.

CPU SPEED ACCELERATOR FOR WINDOWS 7 WINDOWS 7

Contrasting Direct2D and GDI acceleration in Windows 7.

Difficulty in synchronizing session and global kernel address spaces.

Increasing complexity and size of display drivers.

This topic explores the differences between Direct2D and GDI, including past and present differences in the hardware acceleration features of both APIs. Direct2D and GDI are both immediate mode 2D rendering APIs and both offer some degree of hardware acceleration.

Cpu speed accelerator for windows 7