Re: Quartz from the Command Line
Re: Quartz from the Command Line
- Subject: Re: Quartz from the Command Line
- From: Mike Paquette <email@hidden>
- Date: Sun, 25 Apr 2004 09:55:20 -0700
On Apr 25, 2004, at 12:20 AM, Greg Hulands wrote:
I am about to create a tool that will composite two images together
and produce a composited image. It has to be a tool that can run
without a window server present (as it will be called from a
webobjects application). I am just looking into what libraries to use
to achieve this. I have tried linking against app kit and using
NSImage to composite the images together, but it fails as it try's to
make a connection to the window server.
The only other library available on OS X is the quartz library to
composite the images, but I do not know whether or not a window server
needs to be present in order for it to use the image compositing
functions.
I found this thread on mamasam:
http://cocoa.mamasam.com/MACOSXDEV/2002/05/2/34141.php
But there was no definitive answer that if you use these functions if
you do indeed need a window server present.
If an application links with high level application-oriented
frameworks such as Carbon or Cocoa, then during framework
initialization these frameworks may try to form a connection to the
window server. This is done in anticipation of a need to create
windows, menus, and Dock reporesentations and to prepare to receive
events.
The use of the Quartz (CG) functions to manipulate CGImageRefs and
generate bitmap contexts, such as you are doing, does not require a
connection to the window server. If you can avoid linking the Carbon
or Cocoa frameworks, then your program won't need to form a window
server connection. In general, this requires that your program link
with Foundation, for Objective-C usage, and ApplicationServices, for
Quartz access.
You may want to consider using the Python Quartz bindings available in
Mac OS X 10.3. If you have Developer tools installed, look at the
examples in /Developer/Examples/Quartz/Python. The contactsheet.py
example demonstrates loading multiple images from JPEG files and
assembling them in a single context. bitmap.py demonstrates how create
a bitmap context and save it as a PNG file.
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