Preface
The graphics systems available to Macintosh applications have evolved very quickly over the past few
years. Prior to the introduction of Mac OS X, the primary focus of all Macintosh graphics was the
QuickDraw graphics library. QuickDraw not only provided the tools that applications needed to draw into
their windows, but it also played a role in managing the screen, handling events, and changing the
cursor. As the demands placed on the graphics system increased, Apple discovered that a reliance on
QuickDraw imparted some limitations to their capability to expand the graphics system. During the
transition to Mac OS X, many of QuickDraw's responsibilities migrated to other portions of the system.
To handle many of the drawing and screen management tasks, Apple introduced a new graphics system
called Quartz. In programming circles, Quartz is also known as Core Graphics.
Quartz not only handles many of the responsibilities of QuickDraw, it is the platform on which many of
the innovations in the Mac OS X graphics system are built. For example, Core Graphics has taken over
the job of collecting the images of windows and combing them on the screen. In performing this task, it
takes advantage of modern graphics hardware to improve performance and introduce features such as
translucent windows to the system. The end result is a remarkably flexible graphics system. Quartz
allows applications to seamlessly integrate technologies as diverse as the motion graphics of QuickTime
and the 3D graphics of OpenGL onto the same screen or even into the same window.
With the introduction of Mac OS X 10.4, Tiger, Apple has deprecated QuickDrawand that library will not
evolve any farther. Applications that only rely on QuickDraw for drawing will not enjoy any innovations
Apple makes in the graphics system. Even worse, in the future, applications that rely on QuickDraw may
actually pay a performance penalty. Any program that wants to take full advantage of the graphics
system on Mac OS X will have to replace their QuickDraw drawing code with a more modern alternative.
Apple recommends that application developers replace their QuickDraw graphics code with similar code
that uses Quartz 2D.
Quartz 2D is a part of the Core Graphics system. It is a modern graphics library based on the imaging
model that Adobe created originally for PostScript printers and later as part of the PDF graphics file
format. This is the same imaging model that graphics professionals have used for several years to create
the artwork on everything from books and advertisements to application splash screens and on-line
games.
The Quartz 2D drawing model allows you to create sophisticated graphics with a simple API. The Quartz
2D imaging model is quite different from the drawing models of other graphics libraries. Its library can
draw to many kinds of graphics devices while maximizing the fidelity of the graphics on each device. As
a result, developers familiar other graphics libraries such as QuickDraw, GDI from Microsoft Windows, or
the graphics portions of X11's XLib face a learning curve when trying to work with the device and
resolution independent drawing model in Quartz 2D.
The objective of this book is to present a practical introduction to Quartz 2D. Its aim is to help all
programmers understand the Quartz 2D imaging model and make effective use of the library from any
application environment. Most importantly, the text compares and contrasts the Quartz 2D imaging
model with the pixel-based graphics models of other libraries. While this will be of particular value to
developers making the transition from QuickDraw or GDI to Quartz 2D, it also provides valuable insight
into how to use Quartz 2D effectively. The hope is that this information will be invaluable to anyone
trying to draw graphics using Quartz 2D.
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