Bit blit in the context of DirectDraw

👉 Bit blit in the context of DirectDraw

DirectDraw (ddraw.dll) is an API that used to be a part of Microsoft's DirectX API. DirectDraw is used to accelerate rendering of 2D graphics in applications. DirectDraw also allows applications to run fullscreen or embedded in a window such as most other MS Windows applications. DirectDraw uses hardware acceleration if it is available on the client's computer. DirectDraw allows direct access to video memory, hardware overlays, hardware blitters, and page flipping. Its video memory manager can manipulate video memory with ease, taking full advantage of the blitting and color decompression capabilities of different types of display adapters.

Because DirectDraw is a 2D API, it contains commands for 2D rendering and although it does not support 3D hardware acceleration, versions through to 7.0 of DirectDraw are tightly coupled to their respective version of Direct3D. In order to utilize 3D acceleration in Direct3D 7.0 and below, DirectDraw must be used in order to create an IDirect3D interface with the help of IDirectDraw7->QueryInterface, from which comes an IDirect3DDevice, and from there the remainder of the Direct3D API can be accessed and utilized. DirectDraw provides Textures (through Surfaces), Clippers, Palettes and Pixel Formats to Direct3D as well as the final presentation pass to display rendered images to the screen.

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Bit blit in the context of Blitter

A blitter is a circuit, sometimes as a coprocessor or a logic block on a microprocessor, dedicated to the rapid movement and modification of data within a computer's memory. A blitter can copy large quantities of data from one memory area to another relatively quickly, and in parallel with the CPU, while freeing up the CPU's more complex capabilities for other operations. A typical use for a blitter is the movement of a bitmap, such as windows and icons in a graphical user interface or images and backgrounds in a 2D video game.

The name comes from the bit blit operation of the 1973 Xerox Alto, which stands for bit-block transfer. A blit operation is more than a memory copy, because it can involve data that's not byte aligned (hence the bit in bit blit), handling transparent pixels (pixels which should not overwrite the destination), and various ways of combining the source and destination data.

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👉 Bit blit in the context of DirectDraw

Bit blit in the context of Blitter