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Cairo is a native PHP extension to create and modify graphics using the Cairo Graphics Library.

The Cairo Graphics Library is a 2D library written in C with support for multiple output devices. Currently supported output targets include the X Window System, Quartz, Win32, image buffers, PostScript, PDF, and SVG file output. Experimental backends include OpenGL (through glitz), XCB, BeOS, OS/2, and DirectFB. The library also has support for two types of text manipulation and layout. The "toy" API provides demo quality support, and the glyphs API, although full-featured, works best with a helper library such as pango. Font backend support includes FreeType, Quartz, Win32, and User fonts.

There are two types of computer graphics, vector and raster. Raster graphics are the representation of images as an array of pixels. Vector graphics use geometrical primitives such as points, lines, curves or polygons to represent images. The primitives are created using mathematical equations. The Cairo Graphics Library takes a vector approach to graphics, allowing smaller size, infinite zooming, and moving, scaling and rotating without degrading image quality.

Operations in the cairo graphics library including stroking and filling cubic Bézier splines, transforming and compositing translucent images, and antialiased text rendering. All drawing operations can be transformed by any affine transformation (scale, rotation, shear, and others) This is very similiar to drawing operations for PostScript and PDF drawing.

The Cairo PHP Extension aims to provide support for all officially supported font backends and surface backends, as well as expose all available functionality in cairo to PHP users.

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